Document:

EX-4.6

 Exhibit 4.6 

EXECUTION VERSION 
 ESCROW AND
PAYING AGENT AGREEMENT 
 (Class B) 

Dated as of May 23, 2018 

among 
 U.S. BANK NATIONAL
ASSOCIATION 
 as Escrow Agent 

CREDIT SUISSE SECURITIES (USA) LLC 

and 
 CITIGROUP GLOBAL MARKETS
INC. 
 for themselves and on behalf 

of the several Underwriters 

WILMINGTON TRUST, NATIONAL ASSOCIATION, 

not in its individual capacity, 

but solely as Pass Through Trustee 

for and on behalf of 
 United
Airlines Pass Through Trust 2018-1B-O 
 as Pass Through
Trustee 
 and 
 WILMINGTON
TRUST, NATIONAL ASSOCIATION 
 as Paying Agent 

 TABLE OF CONTENTS 

 

							
	 SECTION 1.
	 	Escrow Agent	  	 	2	 
	 Section 1.01.
	 	Appointment of Escrow Agent	  	 	2	 
	 Section 1.02.
	 	Instruction; Etc.	  	 	3	 
	 Section 1.03.
	 	Initial Escrow Amount; Issuance of Escrow Receipts	  	 	4	 
	 Section 1.04.
	 	Payments to Receiptholders	  	 	4	 
	 Section 1.05.
	 	Mutilated, Destroyed, Lost or Stolen Escrow Receipt	  	 	5	 
	 Section 1.06.
	 	Additional Escrow Amounts	  	 	5	 
	 Section 1.07.
	 	Resignation or Removal of Escrow Agent	  	 	5	 
	 Section 1.08.
	 	Persons Deemed Owners	  	 	6	 
	 Section 1.09.
	 	Further Assurances	  	 	6	 
			
	 SECTION 2.
	 	Paying Agent	  	 	6	 
	 Section 2.01.
	 	Appointment of Paying Agent	  	 	6	 
	 Section 2.02.
	 	Establishment of Paying Agent Account	  	 	7	 
	 Section 2.03.
	 	Payments from Paying Agent Account	  	 	7	 
	 Section 2.04.
	 	Withholding Taxes	  	 	8	 
	 Section 2.05.
	 	Resignation or Removal of Paying Agent	  	 	8	 
	 Section 2.06.
	 	Notice of Final Withdrawal	  	 	8	 
			
	 SECTION 3.
	 	Payments	  	 	9	 
			
	 SECTION 4.
	 	Other Actions	  	 	9	 
			
	 SECTION 5.
	 	Representations and Warranties of the Escrow Agent	  	 	9	 
			
	 SECTION 6.
	 	Representations and Warranties of the Paying Agent	  	 	10	 
			
	 SECTION 7.
	 	Indemnification	  	 	11	 
			
	 SECTION 8.
	 	Amendment, Etc.	  	 	12	 
			
	 SECTION 9.
	 	Notices	  	 	12	 
			
	 SECTION 10.
	 	Transfer	  	 	13	 
			
	 SECTION 11.
	 	Entire Agreement	  	 	13	 
			
	 SECTION 12.
	 	Governing Law	  	 	13	 
			
	 SECTION 13.
	 	Waiver of Jury Trial Right	  	 	13	 
			
	 SECTION 14.
	 	Counterparts	  	 	13	 
			
	 SECTION 15.
	 	Rights of Holders	  	 	14	 
			
	 Exhibit A
	 	Escrow Receipt	  			
			
	 Exhibit B
	 	Withdrawal Certificate	  			

  
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 ESCROW AND PAYING AGENT AGREEMENT (Class B) dated as of May 23, 2018, (as amended, modified or supplemented
from time to time, this “Agreement”) among U.S. BANK NATIONAL ASSOCIATION, a national banking association, as Escrow Agent (in such capacity, together with its successors in such capacity, the “Escrow Agent”);
CREDIT SUISSE SECURITIES (USA) LLC and CITIGROUP GLOBAL MARKETS INC. for themselves and on behalf of the several Underwriters of the Certificates referred to below (the “Underwriters” and together with their respective transferees
and assigns as registered owners of the Certificates, the “Investors”) under the Underwriting Agreement referred to below; WILMINGTON TRUST, NATIONAL ASSOCIATION, a national banking association, not in its individual capacity except
as otherwise expressly provided herein, but solely as trustee (in such capacity, together with its successors in such capacity, the “Pass Through Trustee”) under the Pass Through Trust Agreement referred to below; and WILMINGTON
TRUST, NATIONAL ASSOCIATION, a national banking association, as paying agent hereunder (in such capacity, together with its successors in such capacity, the “Paying Agent”). 

W I T N E S S E T H 

WHEREAS, United Airlines, Inc. (“United”) and the Pass Through Trustee have entered into a Trust Supplement, dated as of
May 23, 2018 (the “Trust Supplement”), to the Pass Through Trust Agreement, dated as of October 3, 2012 (together, as amended, modified or supplemented from time to time in accordance with the terms thereof, the
“Pass Through Trust Agreement”) relating to United Airlines Pass Through Trust 2018-1B-O (the “Pass Through Trust”) pursuant to which
the United Airlines Pass Through Trust, Series 2018-1B-O Certificates referred to therein (the “Certificates”) are being issued (the date of such
issuance, the “Class B Issuance Date”); 
 WHEREAS, United and the Underwriters have entered into an
Underwriting Agreement dated May 9, 2018 (as amended, modified or supplemented from time to time in accordance with the terms thereof, the “Underwriting Agreement”) pursuant to which the Pass Through Trustee will issue and sell
the Certificates to the Underwriters; 
 WHEREAS, on February 14, 2018, United, two other pass through trustees and certain other
persons entered into a Note Purchase Agreement (the “Initial Note Purchase Agreement”); 
 WHEREAS, United, the Pass
Through Trustee, two other pass through trustees and certain other persons concurrently herewith are entering into Amendment No. 1 to Note Purchase Agreement, dated as of the date hereof (the “Amendment”, and the Initial Note Purchase
Agreement, as amended in the Amendment, the “Note Purchase Agreement”), pursuant to which the Pass Through Trustee has agreed to acquire from time to time on or prior to the Delivery Period Termination Date (as defined in the Note
Purchase Agreement) equipment notes (the “Equipment Notes”) issued to finance the acquisition of certain aircraft by United, as owner, utilizing a portion of the proceeds from the sale of the Certificates (the “Net
Proceeds”); 

  
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 WHEREAS, the Underwriters and the Pass Through Trustee intend that the Net Proceeds (excluding
any amount used by the Pass Through Trustee to purchase Equipment Notes on the Class B Issuance Date) be held in escrow by the Escrow Agent on behalf of the Investors, subject to withdrawal upon request by the Pass Through Trustee and
satisfaction of the conditions set forth in the Note Purchase Agreement for the purpose of purchasing Equipment Notes, and that pending such withdrawal the Net Proceeds be deposited on behalf of the Escrow Agent with Citibank, N.A., a national
banking association, as Depositary (the “Depositary”, which shall also be deemed to refer to any Replacement Depositary (as defined in the Note Purchase Agreement) from and after the date on which the Deposits are transferred to
such Replacement Depositary) under the Deposit Agreement, dated as of the date hereof between the Depositary and the Escrow Agent relating to the Pass Through Trust (as amended, modified, supplemented or replaced from time to time in accordance with
the terms thereof, the “Deposit Agreement”, which shall also be deemed to refer to any Replacement Deposit Agreement (as defined in the Note Purchase Agreement) to which the Escrow Agent becomes a party pursuant to
Section 1.02(a) hereof from and after the transfer of the Deposits from the Depositary to the Replacement Depositary) pursuant to which, among other things, the Depositary will pay interest for distribution to the Investors and establish
accounts from which the Escrow Agent shall make withdrawals upon request of and proper certification by the Pass Through Trustee; 

WHEREAS, the Escrow Agent wishes to appoint the Paying Agent to pay amounts required to be distributed to the Investors in accordance with
this Agreement; and 
 WHEREAS, capitalized terms used but not defined herein shall have the meanings ascribed to such terms in the Pass
Through Trust Agreement. 
 NOW, THEREFORE, in consideration of the obligations contained herein, and for other good and valuable
consideration, the receipt and sufficiency of which is hereby acknowledged, the parties hereto hereby agree as follows: 
 SECTION 1.
Escrow Agent. 
 Section 1.01. Appointment of Escrow Agent. Each of the Underwriters, for and on behalf of each of the
Investors, hereby irrevocably appoints, authorizes and directs the Escrow Agent to act as escrow agent and fiduciary hereunder and under the Deposit Agreement for such specific purposes and with such powers as are specifically delegated to the
Escrow Agent by the terms of this Agreement, together with such other powers as are reasonably incidental thereto. Any and all money received and held by the Escrow Agent under this Agreement or the Deposit Agreement shall be held in escrow by the
Escrow Agent in accordance with the terms of this Agreement. This Agreement is irrevocable and the Investors’ rights with respect to any monies received and held in escrow by the Escrow Agent under this Agreement or the Deposit Agreement shall
only be as provided under the terms and conditions of this Agreement and the Deposit Agreement. The Escrow Agent (which term as used in this sentence shall include reference to its affiliates and its own and its affiliates’ officers, directors,
employees and agents): (a) shall have no duties or responsibilities except those expressly set forth in this Agreement; (b) shall not be responsible to the Pass Through Trustee or the Investors for any recitals, statements, representations or
warranties of any person other than itself contained in this Agreement or the Deposit Agreement or for the failure by the Pass Through Trustee, the Investors or any other person or entity (other than the Escrow Agent) to perform any of its
obligations hereunder (whether or not the Escrow Agent shall have any knowledge thereof); and (c) shall not be responsible for any action taken or omitted to be taken by it hereunder or provided for herein or in connection herewith, except for
its own willful misconduct or gross negligence (or simple negligence in connection with the handling of funds). 

  
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 Section 1.02. Instruction; Etc. The Underwriters, for and on behalf of each of the
Investors, hereby irrevocably instruct the Escrow Agent, and the Escrow Agent agrees: 
 (a) to enter into the Deposit
Agreement, and, if requested by the Company pursuant to Section 4(a)(vii) of the Note Purchase Agreement, to enter into a Replacement Deposit Agreement with the Replacement Depositary specified by the Company; 

(b) to appoint the Paying Agent as provided in this Agreement; 

(c) upon receipt at any time and from time to time prior to the Termination Date (as defined below) of a certificate
substantially in the form of Exhibit B hereto (a “Withdrawal Certificate”) executed by the Pass Through Trustee, together with an attached Notice of Purchase Withdrawal in substantially the form of Exhibit A to the Deposit Agreement
duly completed by the Pass Through Trustee (the “Applicable Notice of Purchase Withdrawal” and the withdrawal to which it relates, a “Purchase Withdrawal”), immediately to execute the Applicable Notice of Purchase
Withdrawal as Escrow Agent and transmit it to the Depositary by facsimile transmission in accordance with the Deposit Agreement; provided that, upon the request of the Pass Through Trustee after such transmission, the Escrow Agent shall
cancel such Applicable Notice of Purchase Withdrawal; 
 (d) upon receipt of a Withdrawal Certificate executed by the Pass
Through Trustee, together with an attached Notice of Replacement Withdrawal in substantially the form of Exhibit C to the Deposit Agreement duly completed by the Pass Through Trustee, to: 

(X) give such Notice of Replacement Withdrawal to the Depositary requesting a withdrawal, on the date specified in such
notice, which shall not be less than five Business Days after such notice is given (the “Replacement Withdrawal Date”), of all Deposits then held by the Depositary together with all accrued and unpaid interest on such Deposits to
but excluding the Replacement Withdrawal Date; and 
 (Y) direct the Depositary to transfer such Deposits and accrued
interest on behalf of the Escrow Agent to the Replacement Depositary in accordance with the Replacement Deposit Agreement; and 

(e) if there are any undrawn Deposits (as defined in the Deposit Agreement) on the “Termination Date”, which
shall mean the earlier of (i) August 31, 2018 (provided that, if a labor strike occurs or continues at The Boeing Company after February 14, 2018 and on or prior to August 31, 2018 (a “Labor Strike”), such date
shall be extended by adding thereto the number of days that such strike continued in effect after February 14, 2018, but not more than 60 days (the “Additional Days”)) and (ii) the

  
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day on which the Escrow Agent receives notice from the Pass Through Trustee that the Pass Through Trustee’s obligation to purchase Equipment Notes under the Note Purchase Agreement has
terminated, to immediately give notice to the Depositary (with a copy to the Paying Agent) substantially in the form of Exhibit B to the Deposit Agreement requesting a withdrawal of all of the remaining Deposits, together with accrued and unpaid
interest on such Deposits to the date of withdrawal, on the 25th day after the date that such notice of withdrawal is given to the Depositary (or, if not a Business Day, on the next succeeding Business Day) (a “Final Withdrawal”),
provided that if the day scheduled for the Final Withdrawal in accordance with the foregoing is within 10 days before or after a Regular Distribution Date, then the Escrow Agent shall request that such requested Final Withdrawal be made on
such Regular Distribution Date (the date of such requested withdrawal, the “Final Withdrawal Date”). 
 If for any reason the Escrow Agent
shall have failed to give the Final Withdrawal Notice to the Depositary on or before September 10, 2018 (provided that if a Labor Strike occurs or continues, such date shall be extended by the Additional Days), and there are unwithdrawn
Deposits on such date, the Final Withdrawal Date shall be deemed to be September 30, 2018 (provided that if a Labor Strike occurs or continues, such date shall be extended by the Additional Days). 

Section 1.03. Initial Escrow Amount; Issuance of Escrow Receipts. The Escrow Agent hereby directs the Underwriters to, and the
Underwriters hereby acknowledge that on the date hereof they shall, irrevocably deliver to the Depositary on behalf of the Escrow Agent, an amount in U.S. dollars (“Dollars”) and immediately available funds equal to $22,338,000 for
deposit on behalf of the Escrow Agent with the Depositary in accordance with Section 2.1 of the Deposit Agreement. The Underwriters hereby instruct the Escrow Agent, upon receipt of such sum from the Underwriters, to confirm such receipt by
executing and delivering to the Pass Through Trustee an Escrow Receipt in the form of Exhibit A hereto (an “Escrow Receipt”), (a) to be affixed by the Pass Through Trustee to each Certificate and (b) to evidence the same
percentage interest (the “Escrow Interest”) in the Account Amounts (as defined below) as the Fractional Undivided Interest in the Pass Through Trust evidenced by the Certificate to which it is to be affixed. The Escrow Agent shall
provide to the Pass Through Trustee for attachment to each Certificate newly issued under and in accordance with the Pass Through Trust Agreement an executed Escrow Receipt as the Pass Through Trustee may from time to time request of the Escrow
Agent. Each Escrow Receipt shall be registered by the Escrow Agent in a register (the “Register”) maintained by the Escrow Agent in the name of the same holder that is the holder of the Certificate to which it is attached and may
not thereafter be detached from such Certificate to which it is to be affixed prior to the distribution of the Final Withdrawal or, if the Final Withdrawal Date is not a Regular Distribution Date and any Equipment Notes have been purchased by the
Pass Through Trustee prior to such Final Withdrawal Date, the next succeeding Regular Distribution Date (the “Final Distribution”). After the Final Distribution, no additional Escrow Receipts shall be issued and the Pass Through
Trustee shall request the return to the Escrow Agent for cancellation of all outstanding Escrow Receipts. 
 Section 1.04. Payments
to Receiptholders. All payments and distributions made to holders of an Escrow Receipt (collectively “Receiptholders”) in respect of the Escrow Receipt shall be made only from amounts deposited in the Paying Agent Account (as
defined below) (“Account Amounts”). Each Receiptholder, by its acceptance of an Escrow Receipt, agrees that 

  
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 (a) it will look solely to the Account Amounts for any payment or distribution due to such Receiptholder
pursuant to the terms of the Escrow Receipt and this Agreement (subject to Section 15 hereof) and (b) it will have no recourse to United, the Pass Through Trustee, the Paying Agent or the Escrow Agent, except as expressly provided herein
or in the Pass Through Trust Agreement. No Receiptholder shall have any right to vote or in any manner otherwise control the operation and management of the Paying Agent Account or the obligations of the parties hereto, nor shall anything set forth
herein, or contained in the terms of the Escrow Receipt, be construed so as to constitute the Receiptholders from time to time as partners or members of an association. 

Section 1.05. Mutilated, Destroyed, Lost or Stolen Escrow Receipt. If (a) any mutilated Escrow Receipt is surrendered to the
Escrow Agent or the Escrow Agent receives evidence to its satisfaction of the destruction, loss or theft of any Escrow Receipt and (b) there is delivered to the Escrow Agent and the Pass Through Trustee such security, indemnity or bond, as may
be required by them to hold each of them harmless, then, absent notice to the Escrow Agent or the Pass Through Trustee that such destroyed, lost or stolen Escrow Receipt has been acquired by a bona fide purchaser, and provided that the requirements
of Section 8-405 of the Uniform Commercial Code in effect in any applicable jurisdiction are met, the Escrow Agent shall execute, authenticate and deliver, in exchange for or in lieu of any such
mutilated, destroyed, lost or stolen Escrow Receipt, a new Escrow Receipt or Escrow Receipts and of like Escrow Interest in the Account Amounts and bearing a number not contemporaneously outstanding. 

In connection with the issuance of any new Escrow Receipt under this Section 1.05, the Escrow Agent may require the payment of a sum
sufficient to cover any tax or other governmental charge that may be imposed in relation thereto and any other expenses (including the fees and expenses of the Pass Through Trustee and the Escrow Agent) connected therewith. 

Any duplicate Escrow Receipt issued pursuant to this Section 1.05 shall constitute conclusive evidence of the appropriate Escrow Interest
in the Account Amounts, as if originally issued, whether or not the lost, stolen or destroyed Escrow Receipt shall be found at any time. 

The provisions of this Section are exclusive and shall preclude (to the extent lawful) all other rights and remedies with respect to the
replacement or payment of mutilated, destroyed, lost or stolen Escrow Receipts. 
 Section 1.06. Additional Escrow Amounts. On
the date of any Purchase Withdrawal, the Pass Through Trustee may re-deposit with the Depositary some or all of the amounts so withdrawn in accordance with Section 2.4 of the Deposit Agreement. 

Section 1.07. Resignation or Removal of Escrow Agent. Subject to the appointment and acceptance of a successor Escrow Agent as
provided below, the Escrow Agent may resign at any time by giving 30 days’ prior written notice thereof to the Investors, but may not otherwise be removed except for cause by the written consent of the Investors with respect to Investors
representing Escrow Interests aggregating not less than a majority in interest in the Account Amounts (an “Action of Investors”). Upon any such resignation or removal, the Investors, by an Action of Investors, shall have the right
to appoint a successor Escrow Agent. If 

  
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no successor Escrow Agent shall have been so appointed and shall have accepted such appointment within 30 days after the retiring Escrow Agent’s giving of notice of resignation or the
removal of the retiring Escrow Agent, then the retiring Escrow Agent may appoint a successor Escrow Agent. Any successor Escrow Agent shall be a bank or trust company which has an office in the United States with a combined capital and surplus of at
least $100,000,000. Upon the acceptance of any appointment as Escrow Agent hereunder by a successor Escrow Agent, such successor Escrow Agent shall enter into such documents as the Pass Through Trustee shall require and shall thereupon succeed to
and become vested with all the rights, powers, privileges and duties of the retiring Escrow Agent, and the retiring Escrow Agent shall be discharged from its duties and obligations hereunder. No resignation or removal of the Escrow Agent shall be
effective unless a written confirmation shall have been obtained from each “Rating Agency” (as defined in the Note Purchase Agreement) with respect to the Certificates, that the replacement of the Escrow Agent with the successor Escrow
Agent will not result in (a) a reduction of the rating for the Certificates below the then current rating for the Certificates provided by such Rating Agency or (b) a withdrawal or suspension by such Rating Agency of the rating of the
Certificates. 
 Section 1.08. Persons Deemed Owners. Prior to due presentment of a Certificate for registration of transfer,
the Escrow Agent and the Paying Agent may treat the Person in whose name any Escrow Receipt is registered (as of the day of determination) as the owner of such Escrow Receipt for the purpose of receiving distributions pursuant to this Agreement and
for all other purposes whatsoever, and neither the Escrow Agent nor the Paying Agent shall be affected by any notice to the contrary. 

Section 1.09. Further Assurances. The Escrow Agent agrees to take such actions, and execute such other documents, as may be
reasonably requested by the Pass Through Trustee in order to effectuate the purposes of this Agreement and the performance by the Escrow Agent of its obligations hereunder. 

SECTION 2. Paying Agent. 

Section 2.01. Appointment of Paying Agent. The Escrow Agent hereby irrevocably appoints and authorizes the Paying Agent to act as
its paying agent hereunder, for the benefit of the Investors, for such specific purposes and with such powers as are specifically delegated to the Paying Agent by the terms of this Agreement, together with such other powers as are reasonably
incidental thereto. Any and all money received and held by the Paying Agent under this Agreement or the Deposit Agreement shall be held in the Paying Agent Account for the benefit of the Investors. The Paying Agent (which term as used in this
sentence shall include reference to its affiliates and its own and its affiliates’ officers, directors, employees and agents): (a) shall have no duties or responsibilities except those expressly set forth in this Agreement, and shall not by
reason of this Agreement be a trustee for the Escrow Agent; (b) shall not be responsible to the Escrow Agent for any recitals, statements, representations or warranties of any person other than itself contained in this Agreement or for the
failure by the Escrow Agent or any other person or entity (other than the Paying Agent) to perform any of its obligations hereunder (whether or not the Paying Agent shall have any knowledge thereof); and (c) shall not be responsible for any
action taken or omitted to be taken by it hereunder or provided for herein or in connection herewith, except for its own willful misconduct or gross negligence (or simple negligence in connection with the handling of funds). 

  
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 Section 2.02. Establishment of Paying Agent Account. The Paying Agent shall establish
a deposit account (the “Paying Agent Account”) at Wilmington Trust, National Association, in the name of the Escrow Agent. It is expressly understood by the parties hereto that the Paying Agent is acting as the paying agent of the
Escrow Agent hereunder and that no amounts on deposit in the Paying Agent Account constitute part of the Trust Property. 

Section 2.03. Payments from Paying Agent Account. The Escrow Agent hereby irrevocably instructs the Paying Agent, and the Paying
Agent agrees to act, as follows: 
 (a) On each Interest Payment Date (as defined in the Deposit Agreement) or as soon
thereafter as the Paying Agent has confirmed receipt in the Paying Agent Account from the Depositary of any amount in respect of accrued interest on the Deposits, the Paying Agent shall distribute out of the Paying Agent Account the entire amount
deposited therein by the Depositary. There shall be so distributed to each Receiptholder of record on the 15th day (whether or not a Business Day) preceding such Interest Payment Date by check mailed to such Receiptholder, at the address appearing
in the Register, such Receiptholder’s pro rata share (based on the Escrow Interest in the Account Amounts held by such Receiptholder) of the total amount of interest deposited by the Depositary in the Paying Agent Account on such date, except
that, with respect to Escrow Receipts registered on the Record Date in the name of The Depository Trust Company (“DTC”) or its nominee, such distribution shall be made by wire transfer in immediately available funds to the account
designated by DTC. 
 (b) Upon the confirmation by the Paying Agent of receipt in the Paying Agent Account from the
Depositary of any amount in respect of the Final Withdrawal, the Paying Agent shall forthwith distribute the entire amount of the Final Withdrawal deposited therein by the Depositary. There shall be so distributed to each Receiptholder of record on
the 15th day (whether or not a Business Day) preceding the Final Withdrawal Date by check mailed to such Receiptholder, at the address appearing in the Register, such Receiptholder’s pro rata share (based on the Escrow Interest in the Account
Amounts held by such Receiptholder) of the total amount in the Paying Agent Account on account of such Final Withdrawal, except that, with respect to Escrow Receipts registered on the Record Date in the name of DTC or its nominee, such distribution
shall be made by wire transfer in immediately available funds to the account designated by DTC. 
 (c) If any payment of
interest or principal in respect of the Final Withdrawal is not received by the Paying Agent within five days of the applicable date when due, then it shall be distributed to Receiptholders after actual receipt by the Paying Agent on the same basis
as a Special Payment is distributed under the Pass Through Trust Agreement. 

  
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 (d) The Paying Agent shall include with any check mailed pursuant to this Section
any notice required to be distributed under the Pass Through Trust Agreement that is furnished to the Paying Agent by the Pass Through Trustee. 

Section 2.04. Withholding Taxes. The Paying Agent shall exclude and withhold from each distribution of accrued interest on the
Deposits (as defined in the Deposit Agreement) and any amount in respect of the Final Withdrawal any and all withholding taxes applicable thereto as required by law. The Paying Agent agrees to act as such withholding agent and, in connection
therewith, whenever any present or future taxes or similar charges are required to be withheld with respect to any amounts payable in respect of the Deposits (as defined in the Deposit Agreement) or the escrow amounts, to withhold such amounts and
timely pay the same to the appropriate authority in the name of and on behalf of the Receiptholders, that it will file any necessary withholding tax returns or statements when due, and that, as promptly as possible after the payment thereof, it will
deliver to each such Receiptholder appropriate documentation showing the payment thereof, together with such additional documentary evidence as such Receiptholder may reasonably request from time to time. The Paying Agent agrees to file any other
information reports as it may be required to file under United States law. 
 Section 2.05. Resignation or Removal of Paying
Agent. Subject to the appointment and acceptance of a successor Paying Agent as provided below, the Paying Agent may resign at any time by giving 30 days’ prior written notice thereof to the Escrow Agent, but may not otherwise be removed
except for cause by the Escrow Agent. Upon any such resignation or removal, the Escrow Agent shall have the right to appoint a successor Paying Agent. If no successor Paying Agent shall have been so appointed and shall have accepted such appointment
within 30 days after the retiring Paying Agent’s giving of notice of resignation or the removal of the retiring Paying Agent, then the retiring Paying Agent may appoint a successor Paying Agent. Any successor Paying Agent shall be a bank or
trust company which has an office in the United States with a combined capital and surplus of at least $100,000,000. Upon the acceptance of any appointment as Paying Agent hereunder by a successor Paying Agent, such successor Paying Agent shall
enter into such documents as the Escrow Agent shall require and shall thereupon succeed to and become vested with all the rights, powers, privileges and duties of the retiring Paying Agent, and the retiring Paying Agent shall be discharged from its
duties and obligations hereunder. 
 Section 2.06. Notice of Final Withdrawal. Promptly after receipt by the Paying Agent of
notice that the Escrow Agent has requested a Final Withdrawal or that a Final Withdrawal will be made, the Paying Agent shall cause notice of the distribution of the Final Withdrawal to be mailed to each of the Receiptholders at its address as it
appears in the Register. Such notice shall be mailed not less than 15 days prior to the Final Withdrawal Date. Such notice shall set forth: 

(i) the Final Withdrawal Date and the date for determining Receiptholders of record who shall be entitled to receive
distributions in respect of the Final Withdrawal, 
 (ii) the amount of the payment in respect of the Final Withdrawal for
each $1,000 face amount Certificate (based on information provided by the Pass Through Trustee) and the amount thereof constituting unused Deposits (as defined in the Deposit Agreement) and interest thereon, and 

  
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 (iii) if the Final Withdrawal Date is the same date as a Regular Distribution
Date, the total amount to be received on such date for each $1,000 face amount Certificate (based on information provided by the Pass Through Trustee). 

Such mailing may include any notice required to be given to Certificateholders in connection with such distribution pursuant to the Pass
Through Trust Agreement. 
 SECTION 3. Payments. If, notwithstanding the instructions in Section 4 of the Deposit Agreement that
all amounts payable to the Escrow Agent under the Deposit Agreement be paid by the Depositary directly to the Paying Agent, the Pass Through Trustee or a Replacement Depositary (depending on the circumstances), the Escrow Agent receives any payment
thereunder, then the Escrow Agent shall forthwith pay such amount in Dollars and in immediately available funds by wire transfer to (a) in the case of a payment of accrued interest on the Deposits (as defined in the Deposit Agreement) or any
Final Withdrawal, directly to the Paying Agent Account, (b) in the case of any Purchase Withdrawal, directly to the Pass Through Trustee or its designee as specified and in the manner provided in the Applicable Notice of Purchase Withdrawal and
(c) in the case of any Replacement Withdrawal, to the Replacement Depositary as provided in the Replacement Depositary Agreement. The Escrow Agent hereby waives any and all rights of set-off, combination
of accounts, right of retention or similar right (whether arising under applicable law, contract or otherwise) it may have against amounts payable to the Paying Agent howsoever arising. 

SECTION 4. Other Actions. The Escrow Agent shall take such other actions under or in respect of the Deposit Agreement (including,
without limitation, the enforcement of the obligations of the Depositary thereunder) as the Investors, by an Action of Investors, may from time to time request. 

SECTION 5. Representations and Warranties of the Escrow Agent. The Escrow Agent represents and warrants to United, the Investors, the
Paying Agent and the Pass Through Trustee as follows: 
 (i) it is a national banking association duly organized and validly
existing in good standing under the laws of the United States of America; 
 (ii) it has full power, authority and legal
right to conduct its business and operations as currently conducted and to enter into and perform its obligations under this Agreement, the Deposit Agreement and any Replacement Deposit Agreement; 

(iii) the execution, delivery and performance of each of this Agreement, the Deposit Agreement and any Replacement Deposit
Agreement have been duly authorized by all necessary corporate action on the part of it and do not require any stockholder approval, or approval or consent of any trustee or holder of any indebtedness or obligations of it, and each such document
(other 

  
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than a Replacement Deposit Agreement) has been duly executed and delivered by it and constitutes its legal, valid and binding obligations enforceable against it in accordance with the terms
hereof or thereof except as such enforceability may be limited by bankruptcy, insolvency, moratorium, reorganization or other similar laws or equitable principles of general application to or affecting the enforcement of creditors’ rights
generally (regardless of whether such enforceability is considered in a proceeding in equity or at law); 
 (iv) no
authorization, consent or approval of or other action by, and no notice to or filing with, any United States federal or state governmental authority or regulatory body is required for the execution, delivery or performance by it of this Agreement,
the Deposit Agreement or any Replacement Deposit Agreement; 
 (v) neither the execution, delivery or performance by it of
this Agreement, the Deposit Agreement or any Replacement Deposit Agreement, nor compliance with the terms and provisions hereof or thereof, conflicts or will conflict with or results or will result in a breach or violation of any of the terms,
conditions or provisions of, or will require any consent or approval under, any law, governmental rule or regulation or the charter documents, as amended, or bylaws, as amended, of it or any similar instrument binding on it or any order, writ,
injunction or decree of any court or governmental authority against it or by which it or any of its properties is bound or any indenture, mortgage or contract or other agreement or instrument to which it is a party or by which it or any of its
properties is bound, or constitutes or will constitute a default thereunder or results or will result in the imposition of any lien upon any of its properties; and 

(vi) there are no pending or, to its knowledge, threatened actions, suits, investigations or proceedings (whether or not
purportedly on behalf of it) against or affecting it or any of its property before or by any court or administrative agency which, if adversely determined, (A) would adversely affect the ability of it to perform its obligations under this
Agreement, the Deposit Agreement or any Replacement Deposit Agreement or (B) would call into question or challenge the validity of this Agreement or the Deposit Agreement or the enforceability hereof or thereof in accordance with the terms
hereof or thereof, nor is the Escrow Agent in default with respect to any order of any court, governmental authority, arbitration board or administrative agency so as to adversely affect its ability to perform its obligations under this Agreement or
the Deposit Agreement. 
 SECTION 6. Representations and Warranties of the Paying Agent. The Paying Agent represents and warrants to
United, the Investors, the Escrow Agent and the Pass Through Trustee as follows: 
 (i) it is a national banking association
duly organized and validly existing in good standing under the laws of its jurisdiction of incorporation; 

  
 10 

 (ii) it has full power, authority and legal right to conduct its business and
operations as currently conducted and to enter into and perform its obligations under this Agreement; 
 (iii) the execution,
delivery and performance of this Agreement has been duly authorized by all necessary corporate action on the part of it and does not require any stockholder approval, or approval or consent of any trustee or holder of any indebtedness or obligations
of it, and such document has been duly executed and delivered by it and constitutes its legal, valid and binding obligations enforceable against it in accordance with the terms hereof except as such enforceability may be limited by bankruptcy,
insolvency, moratorium, reorganization or other similar laws or equitable principles of general application to or affecting the enforcement of creditors’ rights generally (regardless of whether such enforceability is considered in a proceeding
in equity or at law); 
 (iv) no authorization, consent or approval of or other action by, and no notice to or filing with,
any United States federal or state governmental authority or regulatory body is required for the execution, delivery or performance by it of this Agreement; 

(v) neither the execution, delivery or performance by it of this Agreement, nor compliance with the terms and provisions
hereof, conflicts or will conflict with or results or will result in a breach or violation of any of the terms, conditions or provisions of, or will require any consent or approval under, any law, governmental rule or regulation or the charter
documents, as amended, or bylaws, as amended, of it or any similar instrument binding on it or any order, writ, injunction or decree of any court or governmental authority against it or by which it or any of its properties is bound or any indenture,
mortgage or contract or other agreement or instrument to which it is a party or by which it or any of its properties is bound, or constitutes or will constitute a default thereunder or results or will result in the imposition of any lien upon any of
its properties; and 
 (vi) there are no pending or, to its knowledge, threatened actions, suits, investigations or
proceedings (whether or not purportedly on behalf of it) against or affecting it or any of its property before or by any court or administrative agency which, if adversely determined, (A) would adversely affect the ability of it to perform its
obligations under this Agreement or (B) would call into question or challenge the validity of this Agreement or the enforceability hereof in accordance with the terms hereof, nor is the Paying Agent in default with respect to any order of any
court, governmental authority, arbitration board or administrative agency so as to adversely affect its ability to perform its obligations under this Agreement. 

SECTION 7. Indemnification. Except for actions expressly required of the Escrow Agent or the Paying Agent hereunder, each of the Escrow
Agent and the Paying Agent shall in all cases be fully justified in failing or refusing to act hereunder unless it shall have been indemnified by the party requesting such action in a manner reasonably satisfactory to it against 

  
 11 

 
any and all liability and expense which may be incurred by it by reason of taking or continuing to take any such action. In the event United requests any amendment to any Operative Agreement (as
defined in the Note Purchase Agreement), the Pass Through Trustee agrees to pay all reasonable fees and expenses (including, without limitation, fees and disbursements of counsel) of the Escrow Agent and the Paying Agent in connection therewith.

 SECTION 8. Amendment, Etc. Upon request of the Pass Through Trustee and approval by an Action of Investors, the Escrow Agent and
Paying Agent shall enter into an amendment to this Agreement, so long as such amendment does not adversely affect the rights or obligations of the Escrow Agent or the Paying Agent, provided that upon request of the Pass Through Trustee and
without any consent of the Investors, the Escrow Agent and Paying Agent shall enter into an amendment to this Agreement for any of the following purposes: 

(1) to correct or supplement any provision in this Agreement which may be defective or inconsistent with any other provision
herein or to cure any ambiguity or correct any mistake or to modify any other provision with respect to matters or questions arising under this Agreement, provided that any such action shall not materially adversely affect the interests of
the Investors; or 
 (2) to comply with any requirement of the SEC, applicable law, rules or regulations of any exchange or
quotation system on which the Certificates are listed or any regulatory body; or 
 (3) to evidence and provide for the
acceptance of appointment under this Agreement of a successor Escrow Agent, successor Paying Agent or successor Pass Through Trustee. 

SECTION 9. Notices. Unless otherwise expressly provided herein, any notice or other communication under this Agreement shall be in
writing (including by facsimile) and shall be deemed to be given and effective upon receipt thereof. All notices shall be sent to (a) in the case of the Investors, as their respective addresses shall appear in the Register, (b) in the case
of the Escrow Agent, U.S. Bank National Association, Boston, MA Office, One Federal Street , 3rd Floor, EX-MA-FED, Boston, MA 02110, Attention: David W. Doucette,
Facsimile: (617) 603-6672, (c) in the case of the Pass Through Trustee, Wilmington Trust, National Association, 1100 North Market Street, Wilmington, DE 19890-1605, Attention: Corporate Trust
Administration (Telecopier: (302) 636-4140) or (d) in the case of the Paying Agent, Wilmington Trust, National Association, 1100 North Market Street, Wilmington, DE 19890-1605, Attention: Corporate Trust
Administration (Telecopier: (302) 636-4140), in each case with a copy to United, United Airlines, Inc., 233 S. Wacker Drive, Chicago, Illinois 60606, Attention: Treasurer (Telecopier: (872) 825-0316) (or at such other address as any such party may specify from time to time in a written notice to the other parties). On or prior to the execution of this Agreement, the Pass Through Trustee has delivered
to the Escrow Agent a certificate containing specimen signatures of the representatives of the Pass Through Trustee who are authorized to give notices and instructions with respect to this Agreement. The Escrow Agent may conclusively rely on such
certificate until the Escrow Agent receives written notice from the Pass Through Trustee to the contrary. 

  
 12 

 The Escrow Agent shall notify the Receiptholders in the event of a default in the payment of
interest on the Deposits when due in accordance with the Deposit Agreement or a default in the payment of any Final Withdrawal in accordance with the terms of the Deposit Agreement and this Agreement and shall promptly forward to Receiptholders upon
receipt copies of all written communications relating to any payments due to the Receiptholders in respect of the Deposits. 
 SECTION 10.
Transfer. No party hereto shall be entitled to assign or otherwise transfer this Agreement (or any interest herein) other than (in the case of the Escrow Agent) to a successor escrow agent under Section 1.07 hereof or (in the case of the
Paying Agent) to a successor paying agent under Section 2.05 hereof, and any purported assignment in violation thereof shall be void. This Agreement shall be binding upon the parties hereto and their respective successors and (in the case of
the Escrow Agent and the Paying Agent) their respective permitted assigns. Upon the occurrence of the Transfer (as defined below) contemplated by the Assignment and Assumption Agreement (as defined below), the Pass Through Trustee shall (without
further act) be deemed to have transferred all of its right, title and interest in and to this Agreement to the trustee of the Successor Trust (as defined below) and, thereafter, the trustee of the Successor Trust shall be deemed to be the
“Pass Through Trustee” hereunder with the rights and obligations of the “Pass Through Trustee” hereunder and each reference herein to “United Airlines Pass Through Trust 2018-1B-O” shall be deemed to be a reference to “United Airlines Pass Through Trust 2018-1B-S”. The parties
hereto hereby acknowledge and consent to the Transfer contemplated by the Assignment and Assumption Agreement. As used herein, “Transfer” means the transfers of the assets to the Successor Trust contemplated by the Assignment and
Assumption Agreement; “Assignment and Assumption Agreement” means the Assignment and Assumption Agreement to be entered into between the Pass Through Trustee and the trustee of the Successor Trust, substantially in the form of
Exhibit C to the Trust Supplement; “Successor Trust” means the United Airlines Pass Through Trust 2018-1B-S. 

SECTION 11. Entire Agreement. This Agreement sets forth all of the promises, covenants, agreements, conditions and understandings among
the Escrow Agent, the Paying Agent, the Underwriters and the Pass Through Trustee with respect to the subject matter hereof, and supersedes all prior and contemporaneous agreements and undertakings, inducements or conditions, express or implied,
oral or written. 
 SECTION 12. Governing Law. This Agreement shall be governed by, and construed in accordance with, the laws of the
State of New York. 
 SECTION 13. Waiver of Jury Trial Right. EACH OF THE ESCROW AGENT, THE PAYING AGENT, THE INVESTORS AND
THE PASS THROUGH TRUSTEE ACKNOWLEDGES AND ACCEPTS THAT IN ANY SUIT, ACTION OR PROCEEDING ARISING OUT OF OR RELATING TO THIS AGREEMENT SUCH PARTY IRREVOCABLY WAIVES ITS RIGHT TO A TRIAL BY JURY. 

SECTION 14. Counterparts. This Agreement may be executed in one or more counterparts, all of which taken together shall constitute one
instrument. 

  
 13 

 SECTION 15. Rights of Holders. Each Receiptholder shall have the right (individually and
without the need for any other action of any Person, including the Escrow Agent or any other Receiptholder), upon any default in the payment of interest on the Deposits when due by the Depositary in accordance with the Deposit Agreement, or upon any
default in the payment of the Final Withdrawal when due by the Depositary in accordance with the terms of the Deposit Agreement and this Agreement, (i) to proceed directly against the Depositary by making a demand to the Depositary for the
portion of such payment that would have been distributed to such Receiptholder pursuant to this Agreement or by bringing suit to enforce payment of such portion and (ii) to enforce any other rights that the Escrow Agent may have in respect of
amounts due from the Depositary under the Deposit Agreement and this Agreement that would have been distributed to such Receiptholder pursuant to this Agreement. Any recovery on such enforcement action shall belong solely to the Receiptholder who
brought such action, and not to the Escrow Agent or any other Receiptholder individually or to Receiptholders as a group. 

  
 14 

 IN WITNESS WHEREOF, the Escrow Agent, the Paying Agent, the Underwriters and the Pass Through
Trustee have caused this Escrow and Paying Agent Agreement (Class B) to be duly executed as of the day and year first above written. 
  

			
	U.S. BANK NATIONAL ASSOCIATION, as Escrow Agent
		
	By	 	 /s/ David W. Doucette

		 	Name: David W. Doucette
		 	Title:   Vice President
	
	CREDIT SUISSE SECURITIES (USA) LLC and CITIGROUP GLOBAL MARKETS INC. for themselves and on behalf of the several Underwriters
	
	By: CREDIT SUISSE SECURITIES (USA) LLC, as an Underwriter
		
	By	 	 /s/ Kashif Malik

		 	Name: Kashif Malik
		 	Title:   Director
	
	By: CITIGROUP GLOBAL MARKETS INC., as an Underwriter
		
	By	 	 /s/ Edward Gurbacki

		 	Name: Edward Gurbacki
		 	Title:   Vice President

 S-1 

Signature Page to Escrow and Paying Agent Agreement (Class B) 18-1 

 
			
	WILMINGTON TRUST, NATIONAL ASSOCIATION, not in its individual capacity, but solely as Pass Through Trustee for and on behalf of United Airlines Pass Through Trust 2018-1B-O
		
	By	 	 /s/ Chad May

		 	Name: Chad May
		 	Title:   Assistant Vice President
	
	 WILMINGTON TRUST, NATIONAL

ASSOCIATION,

	as Paying Agent
		
	By	 	 /s/ Chad May

		 	Name: Chad May
		 	Title:   Assistant Vice President

  
 S-2 
 Signature Page to Escrow and Paying Agent Agreement (Class B)
18-1 

 EXHIBIT A 

UNITED AIRLINES 2018-1B ESCROW RECEIPT 

No. __ 
 This Escrow Receipt
evidences a fractional undivided interest in amounts (“Account Amounts”) from time to time deposited on behalf of the holder hereof into a certain paying agent account (the “Paying Agent Account”) described in the
Escrow and Paying Agent Agreement (Class B) dated as of May 23, 2018 (as amended, modified or supplemented from time to time, the “Escrow and Paying Agent Agreement”) among U.S. BANK NATIONAL ASSOCIATION, as Escrow Agent (in
such capacity, together with its successors in such capacity, the “Escrow Agent”), Credit Suisse Securities (USA) LLC and Citigroup Global Markets Inc., as representatives of the Underwriters, Wilmington Trust, National Association,
as Pass Through Trustee (in such capacity, together with its successors in such capacity, the “Pass Through Trustee”) and Wilmington Trust, National Association, as paying agent (in such capacity, together with its successors in
such capacity, the “Paying Agent”). Capitalized terms not defined herein shall have the meanings assigned to them in the Escrow and Paying Agent Agreement. 

This Escrow Receipt is issued under and is subject to the terms, provisions and conditions of the Escrow and Paying Agent Agreement. By virtue
of its acceptance hereof the holder of this Escrow Receipt assents and agrees to be bound by the provisions of the Escrow and Paying Agent Agreement and this Escrow Receipt. 

This Escrow Receipt represents a fractional undivided interest in amounts deposited from time to time in the Paying Agent Account, and grants
or represents no rights, benefits or interests of any kind in respect of any assets or property other than such amounts. This Escrow Receipt evidences the same percentage interest in the Account Amounts as the Fractional Undivided Interest in the
Pass Through Trust evidenced by the Certificate to which this Escrow Receipt is affixed. 
 All payments and distributions made to
Receiptholders in respect of the Escrow Receipt shall be made only from Account Amounts deposited in the Paying Agent Account. The holder of this Escrow Receipt, by its acceptance of this Escrow Receipt, agrees that it will look solely to the
Account Amounts for any payment or distribution due to it pursuant to this Escrow Receipt (or, in case the Depositary shall default in its obligation to make a payment under the Deposit Agreement that would be an Account Amount, to the Depositary)
and that it will not have any recourse to United, the Pass Through Trustee, the Paying Agent or the Escrow Agent, except as expressly provided herein or in the Pass Through Trust Agreement. No Receiptholder of this Escrow Receipt shall have any
right to vote on or in any manner otherwise control the operation and management of the Paying Agent Account, nor shall anything set forth herein, or contained in the terms of this Escrow Receipt, be construed so as to constitute the Receiptholders
from time to time as partners or members of an association. 
 This Escrow Receipt may not be assigned or transferred except in connection
with the assignment or transfer of the Certificate to which this Escrow Receipt is affixed. After payment to the holder hereof of its Escrow Interest in the Final Distribution, upon the request of the Pass Through Trustee, the holder hereof will
return this Escrow Receipt to the Pass Through Trustee. 

 The Paying Agent may treat the person in whose name the Certificate to which this Escrow Receipt
is attached as the owner hereof for all purposes, and the Paying Agent shall not be affected by any notice to the contrary. 
 THIS ESCROW
RECEIPT SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK. 

  
 2 

 IN WITNESS WHEREOF, the Escrow Agent has caused this Escrow Receipt to be duly executed. 

Dated: ___________________ 
  

			
	U.S. BANK NATIONAL ASSOCIATION,
		 	as Escrow Agent
		
	By	 	  

		 	Name:
		 	Title:

  
 3 

 EXHIBIT B 

WITHDRAWAL CERTIFICATE 
 (Class B)

 U.S. BANK NATIONAL ASSOCIATION 

as Escrow Agent 
 Dear Sirs: 

Reference is made to the Escrow and Paying Agent Agreement, dated as of May 23, 2018 (the “Agreement”). [We hereby certify to you that the
conditions to the obligations of the undersigned to execute a Participation Agreement pursuant to the Note Purchase Agreement have been satisfied] [We hereby notify you that the Depositary is being replaced in accordance with Section 4(a)(vii)
of the Note Purchase Agreement]. Pursuant to Section [1.02(c)][1.02(d)] of the Agreement, please execute the attached [Notice of Purchase Withdrawal][Notice of Replacement Withdrawal] and immediately transmit by
E-mail to the Depositary, at cts.spag@citi.com (Attention: Agency & Trust Payment Group). 

Capitalized terms used herein but not defined herein shall have the meanings set forth in the Agreement. 

 

			
	Very truly yours,
	
	WILMINGTON TRUST, NATIONAL ASSOCIATION, not in its individual capacity but solely as Pass Through Trustee

 
			
		
	By	 	  

 
			
		 	Name:
		 	Title:

 Dated:
                    , 20EX-4.7

 Exhibit 4.7 

EXECUTION VERSION 
 Amendment
No. 1 
 to 

Note Purchase Agreement 

Amendment No. 1, dated as of May 23, 2018 (this “Amendment”), among (i) United Airlines, Inc., a Delaware
corporation (the “Company”), (ii) Wilmington Trust, National Association, a national banking association, not in its individual capacity, except as expressly provided herein, but solely as Class AA Pass Through Trustee,
Class A Pass Through Trustee and Class B Pass Through Trustee, (iii) Wilmington Trust, National Association, a national banking association, as Subordination Agent, (iv) U.S. Bank National Association, a national banking
association, as Escrow Agent and as Class B Escrow Agent, and (v) Wilmington Trust, National Association, a national banking association, as Paying Agent and as Class B Paying Agent, to Note Purchase Agreement, dated as of
February 14, 2018 (as amended by this Amendment, the “Note Purchase Agreement”) among (i) the Company, (ii) the Class AA Pass Through Trustee and the Class A Pass Through Trustee, (iii) the
Subordination Agent, (iv) the Escrow Agent and (v) the Paying Agent. Certain terms used herein above and below are defined as provided in Section 1 below. 

W I T N E S S E T H : 

WHEREAS, on February 14, 2018, the Company caused the Class AA Pass Through Trustee to issue and sell $677,175,000 face amount of
the Class AA Certificates and the Class A Pass Through Trustee to issue and sell $257,965,000 face amount of the Class A Certificates, and the proceeds of such sales were deposited with the Depositary on behalf of the applicable
Escrow Agent; 

 WHEREAS, a portion of the proceeds from the sale of the Class AA Certificates and the
Class A Certificates was used by the Class AA Pass Through Trustee and the Class A Pass Through Trustee, respectively, to purchase Series AA Equipment Notes and Series A Equipment Notes, respectively, issued by the Company and secured
by the Financed Aircraft to finance the acquisition by the Company of the Financed Aircraft, and the balance of such proceeds are intended to be used by the Class AA Pass Through Trustee and the Class A Pass Through Trustee, respectively,
to purchase Series AA Equipment Notes and Series A Equipment Notes, respectively, issued by the Company and secured by the Remaining Aircraft to finance the acquisition by the Company of the Remaining Aircraft; 

WHEREAS, the agreements relating to the Class AA Certificates and the Class A Certificates permit the Company to issue Series B
Equipment Notes secured by the Aircraft but subordinated to the Series AA Equipment Notes and the Series A Equipment Notes, subject to the terms and conditions of such agreements, and the Company now wishes to issue and sell such Series B Equipment
Notes; 
 WHEREAS, pursuant to the Basic Pass Through Trust Agreement as supplemented by the Trust Supplement No. 2018-1B-O (the “Class B Pass Through Trust Agreement”), between the Company and WTNA, as pass through trustee (the
“Class B Pass Through Trustee”), a grantor trust (the “Class B Pass Through Trust”) has been created to facilitate the transactions contemplated hereby, including, without
limitation, the issuance and sale by the Class B Pass Through Trustee of the Class B pass through certificates (the “Class B Certificates”); 

WHEREAS, the Company has entered into the Underwriting Agreement, dated May 9, 2018 (the “Class B Underwriting
Agreement”) with the Underwriters named therein (the “Class B Underwriters”), which provides that the Company will cause the Class B Pass Through Trustee to issue and sell the Class B
Certificates to the Class B Underwriters on the Class B Issuance Date; 

  
 2 

 WHEREAS, concurrently with the execution and delivery of this Amendment, (i) the
Class B Escrow Agent and the Depositary have entered into a Deposit Agreement, dated as of the Class B Issuance Date, relating to the Class B Pass Through Trust ( the “Class B Deposit Agreement”)
whereby the Class B Escrow Agent agreed to direct the Class B Underwriters to make certain deposits referred to therein on the Class B Issuance Date (the “Class B Initial Deposits”) and to permit
the Class B Pass Through Trustee to make additional deposits from time to time thereafter (the Class B Initial Deposits together with such additional deposits are collectively referred to as the “Class B
Deposits”), and (ii) the Class B Pass Through Trustee, the Class B Underwriters, the Class B Paying Agent and the Class B Escrow Agent have entered into an Escrow and Paying Agent Agreement, dated as of the
Class B Issuance Date, relating to the Class B Pass Through Trust (the “Class B Escrow and Paying Agent Agreement”), whereby, among other things, (a) the Class B Underwriters agreed to deliver
an amount equal to the amount of the Class B Initial Deposits to the Depositary on behalf of the Class B Escrow Agent and (b) the Class B Escrow Agent, upon the Depositary receiving such amount, agreed to deliver escrow receipts
to be affixed to each Class B Certificate; 
 WHEREAS, concurrently with the execution and delivery of this Amendment, (i) the
Liquidity Provider has entered into a revolving credit agreement, for the benefit of the holders of the Class B Certificates, with the Subordination Agent, as agent for the Class B Pass Through Trustee on behalf of the Class B Pass
Through Trust (the “Class B Liquidity Facility”) and (ii) in connection with the issuance of the Class B Certificates, the Subordination Agent, the 

  
 3 

 
Class AA Pass Through Trustee, the Class A Pass Through Trustee, the Class B Pass Through Trustee, the Liquidity Provider with respect to the Class AA Certificates, the
Liquidity Provider with respect to the Class A Certificates and the Liquidity Provider with respect to the Class B Certificates entered into an Amended and Restated Intercreditor Agreement, dated as of May 23, 2018 (the
“Intercreditor Agreement”); and 
 WHEREAS, this Amendment is being entered into to provide, among other things, that
(i) on the date of this Amendment the Class B Pass Through Trustee will purchase, and the Company will issue and sell, the Series B Equipment Notes in the respective original principal amounts listed on Schedule IV hereto with
respect to each Financed Aircraft, which shall be secured by the related Financed Aircraft set forth on such Schedule and (ii) upon the financing of each Remaining Aircraft pursuant to the Note Purchase Agreement, the Class B Pass Through
Trustee will fund its purchase of Series B Equipment Notes with the proceeds of one or more Class B Deposits withdrawn by the Class B Escrow Agent under the related Class B Deposit Agreement. 

NOW, THEREFORE, in consideration of the premises and the mutual agreements herein contained and other good and valuable consideration, the
receipt and adequacy of which are hereby acknowledged, the parties hereto agree as follows: 
 Section 1.
Definitions. Unless otherwise defined or provided herein, terms used herein that are defined in the Note Purchase Agreement, as amended by this Amendment, have such respective defined meanings. 

Section 2. Amendments. The Note Purchase Agreement is hereby amended as follows: 

  
 4 

 Section 2.1 Recitals. The first WHEREAS clause is amended by
inserting after “ascribed to such terms in Annex A hereto” the following: “or, if not defined therein, in the Amended Indentures”. 

Section 2.2 Financing of Aircraft 

(a) Section 1(b) is amended by (i) inserting in clause (ii) after “instruct each Pass Through Trustee” the following:
“and the Class B Pass Through Trustee”, (ii) by inserting in clause (iii) after “instruct the relevant Escrow Agent” the following: “and instruct the Class B Pass Through Trustee to instruct the Class B
Escrow Agent”, and (iii) by inserting in clause (iii) after “such Pass Through Trustee” the following: “or Class B Pass Through Trustee”. 

(b) Section 1(c) is amended by deleting “Pass Through Trustee” in the last sentence and substituting in lieu thereof “each
Applicable Pass Through Trustee”. 
 (c) Section 1(e) is amended by (i) inserting in the second sentence after “to fund its
purchase of the related Equipment Notes” the following: “and the Class B Escrow Agent shall be entitled to withdraw one or more Class B Deposits under the Class B Deposit Agreement to enable the Class B Pass Through
Trustee to fund its purchase of the related Equipment Notes” and (ii) inserting in the last sentence after “Section 5.01 of each of the Trust Supplements” the following: “relating to the Pass Through Trust Agreements
and Section 5.01 of the Class B Trust Supplement”. 
 (d) Section 1(h) is amended by deleting “the Pass Through
Trustees” and substituting in lieu thereof the following: “the Applicable Pass Through Trustees”. 
 (e) Section 1(i) is
amended by (i) inserting “(x)” before “to the Class AA or Class A Pass Through Trustee” and (ii) inserting after “related Deposit Agreement” the following: “or (y) to the Class B Pass
Through Trustee in an aggregate principal amount in excess of the amount of the Class B Deposits then available for withdrawal by the Class B Escrow Agent under and in accordance with the provisions of the Class B Deposit
Agreement”. 

  
 5 

 Section 2.3 Conditions Precedent 

(a) Section 2(b) is amended by inserting (A) “Applicable” before “Pass Through Trustee” and (B) by inserting in clause
(ii) after “the Certificateholders” the following: “, the registered holders of the Class B Certificates”. 

(b) Section 2 is amended by inserting in the last paragraph thereof after “each Pass Through Trustee” the following: “and the
Class B Pass Through Trustee”. 
 Section 2.4 Covenants 

(a) Section 4(a), clause (v), is amended by (i) inserting after “the Pass Through Trustee’s” the following: “and the
Class B Pass Through Trustee’s”, (ii) inserting before the closing parenthetical in “(as defined in each Pass Through Trust Agreement)” in the two instances in which it appears the following in such two instances: “and
in the Class B Pass Through Trust Agreement”, and (iii) inserting after “Section 7.01 of each of the Trust Supplements” the following: “relating to the Pass Through Trust Agreements and Section 7.01 of the
Class B Trust Supplement”. 
 (b) Section 4(a), clause (vi), is amended by (i) inserting in the first and last sentences after
“Series A Equipment Notes” the following: “or Series B Equipment Notes”, (ii) inserting in subclause (1) after “Class of Certificates” in the two instances in which it appears the following in such two
instances: “or for the Class B Certificates”, and (iii) inserting in subclause (2) after “Class of Certificates” the following: “or of the Class B Certificates”. 

(c) Section 4(a), clause (vii), is amended by inserting in subclause (A) after “Class of Certificates” the following:
“or for the Class B Certificates”. 

  
 6 

 (d) Section 4(a), clause (vii), is amended by (i) inserting in subclause (C)(z) after
“Class A Certificates with the Escrow Agent” the following: “and for the Class B Certificates with the Class B Escrow Agent” and (ii) deleting in subclause (C)(z) “(including without limitation as to the
interest to be paid on the Deposits) as the Deposit Agreements” and substituting in lieu thereof the following: “(including without limitation as to the interest to be paid on the Deposits and the Class B Deposits) as the Deposit
Agreements and the Class B Deposit Agreement”. 
 (e) Section 4(a), clause (vii), is amended by (i) inserting in the first
paragraph of subclause (D) after “each of the Class AA and Class A Certificates with the Escrow Agent” the following: “and for the Class B Certificates with the Class B Escrow Agent”, (ii) inserting in
the first paragraph of subclause (D) after “(and, upon request of the Company the Escrow Agent” the following: “and Class B Escrow Agent”, (iii) inserting in the first paragraph in subclause (D) after
“delivery of the Deposit Agreement” the following: “and Class B Deposit Agreement”, (iv) inserting in the second paragraph of subclause (D) “(i)” before “shall instruct the Class AA Pass Through
Trustee”, (v) inserting in the second paragraph of subclause (D) after “(as defined in the Escrow and Paying Agent Agreements” the following: “and (ii) shall instruct the Class B Pass Through Trustee, and the
Class B Pass Through Trustee agrees, to execute and deliver to the Class B Escrow Agent a duly completed Withdrawal Certificate (as defined in the Class B Escrow and Paying Agent Agreement) together with a Notice of Replacement
Withdrawal (as defined in the Class B Escrow and Paying Agent Agreement)”, (vi) inserting in the third paragraph of subclause (D) after “the Escrow and Paying Agent Agreements” the following: “, the Class B Escrow
and Paying Agent Agreement”, (vii) inserting in the third paragraph of subclause (D) after “the Deposit Agreements” the following: “and Class B Deposit Agreement”, 

  
 7 

 
(viii) inserting in the fourth paragraph of subclause (D) after “deemed to be the Deposit Agreements” the following: “and Class B Deposit Agreement, as the case may
be”, and (ix) inserting in the fourth paragraph of subclause (D) after “under its Deposit Agreements” the following: “and Class B Deposit Agreement”. 

Section 2.5 Expenses 

(a) Section 6(a) and (b) are amended by deleting all references to the “Liquidity Facility” and substituting in lieu thereof the
following: “Series Liquidity Facility”. 
 (b) Section 6(a) is amended by (i) inserting after “Class AA and
Class A Pass Through Trusts” in the two instances where it appears the following in such two instances: “and the Class B Deposits under the Class B Deposit Agreement pertaining to the Class B Pass Through Trust”
and (ii) deleting “Series AA Equipment Notes and Series A Equipment Notes” and substituting in lieu thereof the following: “Series AA Equipment Notes, Series A Equipment Notes and Series B Equipment Notes”. 

(c) Section 6(b) is amended by (i) inserting in subclause (ii) after “the Pass Through Trust Agreements” the following:
“and the Class B Pass Through Trust Agreement” and (ii) inserting in subclause (iv) after “Escrow Agent and/or the Paying Agent” the following: “and/or the Class B Escrow Agent and/or Class B Paying
Agent”. 
 Section 2.6 Miscellaneous 

(a) Section 8(a) is amended by deleting “of the Company, the Subordination Agent, the Escrow Agent, the Paying Agent and the Pass Through
Trustee, and the Company’s, the Subordination Agent’s, the Escrow Agent’s, the Paying Agent’s and the Pass Through Trustee’s” and substituting in lieu thereof the following: “of the Company, the Subordination
Agent, the Escrow Agent, the Paying Agent, the Pass Through Trustee, the Class B Pass 

  
 8 

 
Through Trustee, the Class B Escrow Agent and the Class B Paying Agent, and the Company’s, the Subordination Agent’s, the Escrow Agent’s, the Paying Agent’s, the
Pass Through Trustee’s, the Class B Pass Through Trustee’s, the Class B Escrow Agent’s and the Class B Paying Agent’s”. 

(b) Section 8(b) is amended by inserting in the last sentence thereof after “as Paying Agent under the Escrow and Paying Agent
Agreement” the following: “, the Class B Pass Through Trustee and its successors as Class B Pass Through Trustee (and any additional Trustee appointed) under the Class B Pass Through Trust Agreement, the Class B Escrow
Agent and its successors as Class B Escrow Agent under the Class B Escrow and Paying Agent Agreement, the Class B Paying Agent and its successors as Class B Paying Agent under the Class B Escrow and Paying Agent
Agreement,”. 
 Section 2.7 Sale of Series B Equipment Notes on the Class B Issuance
Date. A new Section 10 is added to the Note Purchase Agreement immediately after Section 9 thereof to read as follows: 

“SECTION 10. Sale of Series B Equipment Notes on the Class B Issuance Date. Subject to the satisfaction of the
conditions set forth in Section 11, at the closing under the Class B Underwriting Agreement, simultaneously with the purchase and sale of the Class B Certificates thereunder, the applicable parties hereto shall take the following
action: 
 (i) The Company, the Pass Through Trustees, the Class B Pass Through Trustee, the Liquidity Provider and the Subordination
Agent shall enter into the Intercreditor Agreement; 
 (ii) The Company, the Class AA Pass Through Trustee, the Class A Pass
Through Trustee, the Class B Pass Through Trustee, the Subordination Agent and the Loan Trustee shall enter into a PA Amendment with respect to each Amended Participation Agreement; 

(iii) The Company and the Loan Trustee shall enter into an Indenture Amendment with respect to each Amended Indenture, which shall provide for
the issuance of a Series B Equipment Note under such Amended Indenture in the original principal amount and having the amortization schedule set forth on Schedule IV hereto corresponding to such Amended Indenture; 

  
 9 

 (iv) The Company shall issue pursuant to each Amended Indenture, as amended by the applicable
Indenture Amendment, a Series B Equipment Note in the original principal amount and having the amortization schedule set forth on Schedule IV hereto corresponding to such Amended Indenture, the Loan Trustee under such Amended Indenture
shall authenticate such Series B Equipment Note and the Company shall deliver such Series B Equipment Note, against receipt of the payment referred to in Section 10(v), to the Subordination Agent, to be held for the benefit of the
Class B Pass Through Trustee in accordance with the Intercreditor Agreement; and 
 (v) The Class B Pass Through Trustee shall pay
to the Company $203,391,000, by wire transfer of immediately available funds.”. 
 Section 2.8 Conditions
Precedent. A new Section 11 is added to the Note Purchase Agreement immediately after Section 10 thereof to read as follows: 

“SECTION 11. Conditions Precedent. The obligations of the Pass Through Trustees, Class B Pass Through Trustee, the
Subordination Agent and the Loan Trustee to take the actions set forth in Section 10 are subject to the fulfillment of the following conditions precedent: 

(i) The Pass Through Trustees and Class B Pass Through Trustee shall have received the following documents: 

(1) the broker’s report and insurance certificates described in Section E of Annex B of the Amended Indenture with
respect to each Financed Aircraft; and 
 (2) the following opinions of counsel, in each case dated the Class B Issuance
Date: 
  

	 	(A)	an opinion of Hughes Hubbard & Reed LLP, special counsel to the Company, substantially in the form of Exhibit D; 

  

	 	(B)	an opinion of the Company’s Legal Department, substantially in the form of Exhibit E; 

  

	 	(C)	an opinion of Morris James LLP, special counsel to the Loan Trustee, substantially in the form of Exhibit F; and 

  

	 	(D)	an opinion of Lytle Soulé & Curlee, special counsel in Oklahoma City, Oklahoma, substantially in the form of Exhibit G with respect to each Financed Aircraft. 

(ii) The Loan Trustee with respect to each Amended Indenture shall be entitled to the benefits of Section 1110 (as currently in effect)
with respect to the right to take possession of the Financed Aircraft secured under such Amended Indenture and to enforce any of its other rights or remedies as provided in the Amended Indenture in the event of a case under Chapter 11 of the
Bankruptcy Code in which the Company is a debtor. 

  
 10 

 (iii) On the Class B Issuance Date the Indenture Amendments shall have been duly filed for
recordation (or shall be in the process of being so duly filed for recordation) with the FAA in accordance with the Act. 
 (iv) On the
Class B Issuance Date, no Triggering Event shall have occurred. 
 (v) On the Class B Issuance Date, after giving effect to the
filing of the Indenture Amendments with the FAA, Loan Trustee shall have duly perfected a first priority security interest in all of the Company’s right, title and interest in each Financed Aircraft, subject only to Permitted Liens. 

(vi) The Subordination Agent on behalf of each Pass Through Trustee shall have received: 

(1) a copy of the Amended and Restated Certificate of Incorporation and amended and restated By-laws of the Company and resolutions of the board of directors of the Company and/or the executive committee thereof, in each case certified as of the Class B Issuance Date, by the Secretary or an Assistant
Secretary of the Company, duly authorizing the execution, delivery and performance by the Company of the Operative Agreements to which it is party required to be executed and delivered by the Company on or prior to the Class B Issuance Date in
accordance with the provisions hereof and thereof; and (B) an incumbency certificate of the Company as to the person or persons authorized to execute and deliver the Operative Agreements on behalf of the Company; 

(2) an Officer’s Certificate of the Company, dated as of the Class B Issuance Date, stating that its representations
and warranties set forth in Section 12(a) of this Agreement are true and correct as of the Class B Issuance Date (or, to the extent that any such representation and warranty expressly relates to an earlier date, true and correct as of such
earlier date); and 
 (3) a copy of a current, valid Standard Certificate of Airworthiness for the Financed Aircraft duly
issued by the FAA together with a copy of a certificate of registration in the name of the Company. 
 (vii) No change shall have occurred
after the date of this Agreement in any applicable Law that makes it a violation of Law for (a) the Company, any Pass Through Trustee, the Class B Pass Through Trustee, Subordination Agent or Loan Trustee to execute, deliver and perform
the Operative Agreements to which any of them is a party or (b) the Class B Pass Through Trustee to acquire the Series B Equipment Notes pursuant to Section 10(iv) above or to realize the benefits of the security afforded by the
related Amended Indenture. 

  
 11 

 (viii) The representations and warranties of each other party to this Agreement made, in each
case, in this Agreement and in any other Operative Agreement to which it is a party, shall be true and accurate in all material respects as of the Class B Issuance Date (unless any such representation and warranty shall have been made with
reference to a specified date, in which case such representation and warranty shall be true and accurate as of such specified date) and each other party to this Agreement shall have performed and observed, in all material respects, all of its
covenants, obligations and agreements in this Agreement and in any other Operative Agreement to which it is a party to be observed or performed by it as of the Class B Issuance Date. 

(ix) On the Class B Issuance Date, no event shall have occurred and be continuing, or would result from the issuance of the Series B
Equipment Notes, which constitutes a Default or an Event of Default. 
 (x) The Company has good title to the Financed Aircraft, free and
clear of all Liens, except Permitted Liens. 
 (xi) The Financed Aircraft have been duly certificated by the FAA as to type and airworthiness
in accordance with the terms of the relevant Aircraft Purchase Agreement with respect to each Financed Aircraft. 
 (xii) On the Class B
Issuance Date (a) the FAA Filed Documents with respect to each Financed Aircraft have been duly filed for recordation with the FAA in accordance with the Act, (b) the sale of the airframes and engines comprising such Financed Aircraft to
the Company and the International Interest of the Loan Trustee in the airframes and engines comprising such Financed Aircraft granted under the Amended Indenture have been registered with the International Registry and there does not exist any
registered International Interest with respect to any airframe or engine comprising such Financed Aircraft on the International Registry with a priority over the International Interest of the Loan Trustee therein, (c) each Financing Statement
shall have been duly filed in Delaware and (d) the Subordination Agent, on behalf of each Pass Through Trustee and the Class B Pass Through Trustee, shall have received a printout of the “priority search certificate” from the
International Registry relating to the airframes and engines comprising such Financed Aircraft confirming no International Interest with a priority over the International Interest of the Loan Trustee therein. 

(xiii) No action or proceeding shall have been instituted, nor shall any action be threatened in writing, before any Government Entity, nor
shall any order, judgment or decree have been issued or proposed to be issued by any Government Entity, to set aside, restrain, enjoin or prevent the completion and consummation of this Agreement or any other Operative Agreement or the transactions
contemplated hereby or thereby. 
 (xiv) All appropriate action required to have been taken prior to the Class B Issuance Date by the
FAA, or any governmental or political agency, subdivision or instrumentality of the United States, in connection with the transactions contemplated by this Agreement shall have been taken, and all orders, permits, waivers, authorizations, exemptions
and approvals of such entities required to be in effect on the Class B Issuance Date in connection with the transactions contemplated by this Agreement shall have been issued.”. 

  
 12 

 Section 2.9 Additional Representations and Warranties. A new
Section 12 is added to the Note Purchase Agreement immediately after Section 11 thereof to read as follows: 
 “SECTION 12.
Additional Representations and Warranties. (a) The Company represents and warrants that as of the Class B Issuance Date: 

(i) the Company is duly incorporated, validly existing and in good standing under the laws of the State of Delaware and is a
“citizen of the United States” as defined in Section 40102(a)(15) of the Act, and has the full corporate power, authority and legal right under the laws of the State of Delaware to execute and deliver the Amendment, each PA Amendment,
each Indenture Amendment, and each Series B Equipment Note referred to in Section 10 hereof (each of the foregoing documents being herein called a “Transaction Document” and, collectively, the “Transaction
Documents”) and to carry out the obligations of the Company under each Transaction Document to which it will be a party; 

(ii) the execution and delivery by the Company of each Transaction Document and the performance by the Company of its
obligations under each Transaction Document have been duly authorized by the Company and will not violate (1) its Amended and Restated Certificate of Incorporation or amended and restated By-laws,
(2) any Law applicable to or binding on the Company or (3) the provisions of any indenture, mortgage, contract or other agreement to which it is a party or by which it is bound; 

(iii) the Amendment constitutes, and each other Transaction Document when executed and delivered by the Company will
constitute, the legal, valid and binding obligation of the Company, enforceable against it in accordance with its terms, except as the same may be limited by applicable bankruptcy, insolvency, reorganization, moratorium or similar laws affecting the
rights of creditors generally and by general principles of equity, whether considered in a proceeding at law or in equity; 

(iv) except for the filing for recordation (and recordation) of the Indenture Amendments under the Act and the filing of
continuation statements to continue effectiveness of the “Financing Statements” (as defined in each Amended Indenture), no further action, including any filing or recording of any document (including any financing statement in respect
thereof under Article 9 of the UCC (as defined in the Indentures)) is necessary in order to establish and perfect the Loan Trustee’s security interest in each Financed Aircraft as against the Company and any other Person, in each case, in any
applicable jurisdictions in the United States; 

  
 13 

 (v) the Company is a U.S. Air Carrier (as defined in the Amended Indentures) and
holds all licenses, permits and franchises from the appropriate Government Entities necessary to authorize the Company to lawfully engage in air transportation and to carry on scheduled commercial passenger service as currently conducted, except
where the failure to so hold any such license, permit or franchise would not give rise to a Material Adverse Change (as defined in the Amended Indentures) to the Company; 

(vi) the Company is not an “investment company” or a company controlled by an “investment company” within
the meaning of the Investment Company Act of 1940, as amended; 
 (vii) neither the Company nor any person authorized to act
on its behalf has directly or indirectly offered any beneficial interest or Security (as defined in the Amended Indentures) relating to the ownership of the Financed Aircraft, or any of the Equipment Notes or any other interest in or security under
the Amended Indentures, for sale to, or solicited any offer to acquire any such interest or security from, or has sold any such interest or security to, any person in violation of the Securities Act of 1933, as amended; 

(viii) the Loan Trustee is entitled to the benefits of Section 1110 (as currently in effect) with respect to the right to
take possession of each Financed Aircraft and to enforce any of its other rights or remedies as provided in the Amended Indentures in the event of a case under Chapter 11 of the Bankruptcy Code in which the Company is a debtor; 

(ix) the Company has taken, or caused to be taken, all necessary corporate action (including, without limitation, the obtaining
of any consent or approval of stockholders required by its Amended and Restated Certificate of Incorporation or amended and restated By-laws) to authorize the execution and delivery of each of the Operative
Agreements to which it is party, and the performance of its obligations thereunder; 
 (x) the execution and delivery by the
Company of the Operative Agreements to which the Company is a party, the performance by the Company of its obligations thereunder on the Class B Issuance Date and the consummation by the Company on the Class B Issuance Date of the
transactions contemplated thereby do not and will not require the consent or approval of, or the giving of notice to, or the registration with, or the recording or filing of any documents with, or the taking of any other action in respect of,
(a) any trustee or other holder of any Debt of the Company and (b) any Government Entity, other than (x) the filings and recordations of the Indenture Amendments with the FAA and (y) filings, recordings, notices or other
ministerial actions pursuant to any routine recording, contractual or regulatory requirements applicable to it; 
 (xi) the
Company’s location (as such term is used in Section 9-307 of the UCC) is Delaware. The full and correct legal name and mailing address of the Company are correctly set forth in Schedule 1 to each
Amended Participation Agreement in the column “Address for Notices”; 

  
 14 

 (xii) no Person acting on behalf of the Company is or will be entitled to any
broker’s fee, commission or finder’s fee in connection with the transactions contemplated by this Amendment, other than the fees and expenses payable by the Company in connection with the sale of the Certificates; and 

(xiii) the Company is a Transacting User Entity (as defined in the regulations of the International Registry); is
“situated”, for the purposes of the Cape Town Treaty, in the United States; and has the power to “dispose” (as such term is used in the Cape Town Treaty) of the airframes and engines comprising the Financed Aircraft. The Bills of
Sale for the airframes and engines comprising the Financed Aircraft constituted “contracts of sale” (as defined in the Cape Town Treaty), and each Amended Indenture, as supplemented by the Trust Indenture Supplement in which the airframe
and engines financed under such Amended Indenture were listed, created an International Interest in such airframe and engines. The airframes and engines comprising the Financed Aircraft are “aircraft objects” (as defined in the Cape Town
Treaty); and the United States is a Contracting State under the Cape Town Treaty. 
 (b) WTNA represents and warrants that as of the
Class B Issuance Date: 
 (i) WTNA is a national banking association duly incorporated, validly existing and in good
standing under the laws of the United States and is a “citizen of the United States” as defined in Section 40102(a)(15) of the Act, and has the full corporate power, authority and legal right under the laws of the United States and of
the state of the United States in which it is located pertaining to its banking, trust and fiduciary powers to execute and deliver each Transaction Document to which it will be a party and to carry out the obligations of WTNA, in its capacity as
Subordination Agent, Pass Through Trustee, Class B Pass Through Trustee or Loan Trustee, as the case may be, under each Transaction Document to which it will be a party; 

(ii) the execution and delivery by WTNA, in its capacity as Subordination Agent, Pass Through Trustee or Loan Trustee, as the
case may be, of each Transaction Document and the performance by WTNA, in its capacity as Subordination Agent, Pass Through Trustee, Class B Pass Through Trustee or Loan Trustee, as the case may be, of its obligations under each Transaction
Document have been duly authorized by WTNA, in its capacity as Subordination Agent, Pass Through Trustee, Class B Pass Through Trustee or Loan Trustee, as the case may be, and will not violate its articles of association or by-laws or the provisions of any indenture, mortgage, contract or other agreement to which it is a party or by which it is bound; and 

(iii) this Agreement constitutes, and each other Transaction Document to which it will be a party when executed and delivered
by WTNA will constitute, the legal, valid and binding obligations of WTNA, in its capacity as Subordination Agent, Pass Through Trustee, Class B Pass Through Trustee or Loan Trustee, as the case may be, enforceable against it in accordance with
its terms, except as the same may be limited by applicable bankruptcy, insolvency, reorganization, moratorium or similar laws affecting the rights of creditors generally and by general principles of equity, whether considered in a proceeding at law
or in equity. 

  
 15 

 (c) The Class B Pass Through Trustee hereby confirms to each of the other parties hereto
that its representations and warranties set forth in Section 7.15 of the Basic Pass Through Trust Agreement and Section 5.04 of the Trust Supplement No. 2018-1B are true and correct as of the
date hereof. 
 (d) The Subordination Agent represents and warrants that as of the Class B Issuance Date: 

(i) the Subordination Agent is a national banking association duly incorporated, validly existing and in good standing under
the laws of the United States, and has the full corporate power, authority and legal right under the laws of the United States and of the state of the United States in which it is located pertaining to its banking, trust and fiduciary powers to
execute and deliver each Transaction Document to which it is or will be a party and to perform its obligations under each Transaction Document to which it is or will be a party; 

(ii) the Amendment has been duly authorized, executed and delivered by the Subordination Agent; this Agreement constitutes, and
each other Transaction Document to which it will be a party when executed and delivered by it will constitute, the legal, valid and binding obligations of the Subordination Agent enforceable against it in accordance with its terms, except as the
same may be limited by applicable bankruptcy, insolvency, reorganization, moratorium or similar laws affecting the rights of creditors generally and by general principles of equity, whether considered in a proceeding at law or in equity; 

(iii) none of the execution, delivery and performance by the Subordination Agent of any Transaction Document to which it is or
will be a party contravenes any law, rule or regulation of the state of the United States in which it is located or any United States governmental authority or agency regulating the Subordination Agent’s banking, trust or fiduciary powers or
any judgment or order applicable to or binding on the Subordination Agent and do not contravene the Subordination Agent’s articles of association or by-laws or result in any breach of, or constitute a
default under, any agreement or instrument to which the Subordination Agent is a party or by which it or any of its properties may be bound; 

(iv) neither the execution and delivery by the Subordination Agent of the Amendment or any other Transaction Document to which
it is or will be a party nor the consummation by the Subordination Agent of any of the transactions contemplated hereby or thereby requires the consent or approval of, the giving of notice to, the registration with, or the taking of any other action
with respect to, any governmental authority or agency of the state of the United States in which it is located or any federal governmental authority or agency regulating the Subordination Agent’s banking, trust or fiduciary powers; 

  
 16 

 (v) there are no Taxes payable by the Subordination Agent imposed by the state of
the United States in which it is located or any political subdivision or taxing authority thereof in connection with the execution, delivery and performance by the Subordination Agent of the Amendment or any other Transaction Document to which it is
or will be a party (other than franchise or other taxes based on or measured by any fees or compensation received by the Subordination Agent for services rendered in connection with the transactions contemplated by the Intercreditor Agreement, any
of the Liquidity Facilities or the Class B Liquidity Facility), and there are no Taxes payable by the Subordination Agent imposed by the state of the United States in which it is located or any political subdivision thereof in connection with
the acquisition, possession or ownership by the Subordination Agent of any of the Series B Equipment Notes (other than franchise or other taxes based on or measured by any fees or compensation received by the Subordination Agent for services
rendered in connection with the transactions contemplated by the Intercreditor Agreement, any of the Liquidity Facilities or the Class B Liquidity Facility); and 

(vi) there are no pending or threatened actions or proceedings against the Subordination Agent before any court or
administrative agency which individually or in the aggregate, if determined adversely to it, would materially adversely affect the ability of the Subordination Agent to perform its obligations under this Agreement or any other Transaction Document
to which it is or will be a party. 
 (e) Each Pass Through Trustee and the Class B Pass Through Trustee represents and warrants that:

 (i) it is a national banking association duly incorporated, validly existing and in good standing under the laws of the
United States and has the full corporate power, authority and legal right under the laws of the United States and of the state of the United States in which it is located pertaining to its banking, trust and fiduciary powers to execute and deliver
each Transaction Document to which it is or will be a party and to carry out its obligations under each Transaction Document to which it is or will be a party; 

(ii) the execution and delivery by it of each Transaction Document to which it is or will be a party and the performance of its
obligations thereunder have been duly authorized by it and will not violate its articles of association or by-laws or the provisions of any indenture, mortgage, contract or other agreement to which it is a
party or by which it is bound; and 
 (iii) each Transaction Document to which it is or will be a party constitutes its
legal, valid and binding obligations enforceable against it in accordance with its terms, except as the same may be limited by applicable bankruptcy, insolvency, reorganization, moratorium or similar laws affecting the rights of creditors generally
and by general principles of equity, whether considered in a proceeding at law or in equity. 

  
 17 

 (f) The Loan Trustee represents and warrants that: 

(i) the Loan Trustee is a national banking association duly incorporated, validly existing and in good standing under the laws
of the United States, and has the full corporate power, authority and legal right under the laws of the United States and of the state of the United States in which it is located pertaining to its banking, trust and fiduciary powers to execute and
deliver each Transaction Document to which it is or will be a party and to carry out its obligations under each Transaction Document to which it is or will be a party; 

(ii) the execution and delivery by the Loan Trustee of each Transaction Document to which it is or will be a party and the
performance by the Loan Trustee of its obligations thereunder have been duly authorized by the Loan Trustee and will not violate its articles of association or by-laws or the provisions of any indenture,
mortgage, contract or other agreement to which it is a party or by which it is bound; and 
 (iii) each Transaction Document
to which it is or will be a party constitutes the legal, valid and binding obligations of the Loan Trustee enforceable against it in accordance with its terms, except as the same may be limited by applicable bankruptcy, insolvency, reorganization,
moratorium or similar laws affecting the rights of creditors generally and by general principles of equity, whether considered in a proceeding at law or in equity.”. 

  
 18 

 Section 2.10 FAA Recordation. A new Section 13 is added to
the Note Purchase Agreement immediately after Section 12 thereof to read as follows: 
 “SECTION 13. FAA Recordation. The
Company covenants with each of the other parties hereto that promptly upon the recordation of the Indenture Amendments pursuant to the Act, the Company will cause Lytle Soulé & Curlee, special counsel in Oklahoma City, Oklahoma, to
deliver to, among others, the Company, the Pass Through Trustees, the Class B Pass Through Trustee and the Loan Trustee with respect to each Amended Indenture a favorable opinion or opinions addressed to each of them with respect to such
recordation.”. 
 Section 2.11 Acknowledgement, Consent. A new Section 14 is added to the Note
Purchase Agreement immediately after Section 13 thereof to read as follows: 
 “SECTION 14. Acknowledgement, Consent. Each
of the parties hereto acknowledges and agrees that, from and after the date hereof the Intercreditor Agreement shall constitute the “Intercreditor Agreement” for all purposes of the Operative Agreements, and the Company consents to the
Intercreditor Agreement.”. 
 Section 2.12 Annex A – Definitions 

(a) The definition of “Additional Series Equipment Notes” is amended by deleting “Series AA” or “Series A” and
inserting in lieu thereof the following: “Series AA”, “Series A” or “Series B”. 
 (b) The definition of
“Intercreditor Agreement” is amended and restated as follows: “‘Intercreditor Agreement’ has the meaning set forth in the seventh recital to the Amendment.” 

(c) The definition of “Note Purchase Agreement” is amended by inserting after “attached” the following: “, as amended
by the Amendment”. 
 (d) The definition of “Notice of Purchase Withdrawal” is amended by inserting after “each Deposit
Agreement” the following: “and the Class B Deposit Agreement”. 
 (e) The definition of “Operative Agreements”
is amended by inserting after “the Liquidity Facilities,” the following: “the Class B Pass Through Trust Agreement, the Class B Escrow and Paying Agent Agreement, the Class B Deposit Agreement, the Class B
Liquidity Facility, the Class B Certificates,”. 

  
 19 

 (f) The definition of “Rating Agencies” is amended by inserting after “the
Certificates” in the two instances where it appears the following in such two instances: “and Class B Certificates”. 

(g) The definition of “Rating Agency Confirmation” is amended by inserting after “Class of Certificates” in the
three instances where it appears the following in such three instances: “or for the Class B Certificates”. 
 (h) The
definition of “Replacement Deposit Agreement” is amended and restated as follows: “‘Replacement Deposit Agreement’ means, for each Class of Certificates and the Class B Certificates, a deposit agreement
substantially in the form of the replaced Deposit Agreement for such Class of Certificates or the replaced Class B Deposit Agreement for the Class B Certificates, as the case may be, as shall permit each Rating Agency to confirm in
writing that the replacement of the Depositary will not cause a withdrawal, suspension or downgrading of the rating then in effect for such Class of Certificates and the Class B Certificates by such Rating Agency (without regard to any
withdrawal, suspension or downgrading of the Depositary being replaced)”. 
 (i) The following new definitions shall be inserted in
Annex A in appropriate alphabetical order: 
 “Amended Indenture” means in the case of any Financed Aircraft, the
indenture corresponding thereto listed on Schedule IV to the Note Purchase Agreement, as amended by the related Indenture Amendment. 

  
 20 

 “Amended Participation Agreement” means, in the case of any Financed Aircraft,
the “Participation Agreement” as defined in the Amended Indenture corresponding to such Financed Aircraft, as amended by the related PA Amendment. 

“Amendment” means Amendment No. 1 to Note Purchase Agreement, dated as of the Class B Issuance Date. 

“Class B Certificates” has the meaning set forth in the fourth recital to the Amendment. 

“Class B Deposit Agreement” has the meaning provided in the sixth recital to the Amendment. 

“Class B Deposits” has the meaning set forth in the sixth recital to the Amendment. 

“Class B Escrow Agent” means the “Escrow Agent” as defined in the Class B Escrow and
Paying Agent Agreement. 
 “Class B Escrow and Paying Agent Agreement” has the meaning provided in the
sixth recital to the Amendment. 
 “Class B Issuance Date” means the date of original issuance of the
Class B Certificates. 
 “Class B Paying Agent” means the “Paying Agent” as
defined in the Class B Escrow and Paying Agent Agreement. 
 “Class B Liquidity Facility” has the
meaning set forth in the seventh recital to the Amendment. 

  
 21 

 “Class B Pass Through Trust” has the meaning set forth in the
fourth recital to the Amendment. 
 “Class B Pass Through Trust Agreement” has the meaning set forth in
the fourth recital to the Amendment. 
 “Class B Pass Through Trustee” has the meaning set forth in the
fourth recital to the Amendment. 
 “Class B Trust Supplement” means the Trust Supplement
relating to the Class B Pass Through Trust Agreement. 
 “Class B Underwriting Agreement” means the
Underwriting Agreement, dated May 9, 2018 among the Company, the underwriters named therein and the Depositary relating to the offering of the Class B Certificates. 

“Financed Aircraft” means each Aircraft with respect to which Series AA Equipment Notes and Series A Equipment
Notes have been issued on or prior to the Class B Issuance Date. 
 “Indenture Amendment” means an amendment to each
Amended Indenture substantially in the form of Exhibit I to the Note Purchase Agreement. 
 “PA Amendment” means an
amendment to each Amended Participation Agreement substantially in the form of Exhibit H to the Note Purchase Agreement. 

“Remaining Aircraft” mean each Aircraft other than a Financed Aircraft. 

“Series B Equipment Notes” means the “Series B Equipment Notes” as defined in each Indenture entered into pursuant
to the Note Purchase Agreement. 
 “Series Liquidity Facilities” means the Liquidity Facilities and the Class B
Liquidity Facility. 
 Section 2.13 Schedule III – Required Terms. Schedule III to the Note
Purchase Agreement is amended and restated in the form of Schedule III to this Amendment. 

  
 22 

 Section 2.14 Schedule IV – Amended Indentures. A new
Schedule IV is added to the Note Purchase Agreement immediately after Schedule III thereof in the form of Schedule IV to this Amendment. 

Section 2.15 Exhibit A – Form of Closing Notice. Exhibit A to the Note Purchase Agreement is amended and
restated in the form of Exhibit A to this Amendment. 
 Section 2.16 Exhibit B – Form of Participation Agreement 

(a) The last paragraph of Section 2.1 is amended to insert (i) in the first sentence after “Series A Equipment Notes” the
following: “or Series B Equipment Notes”, and (ii) in the second sentence after “Series A” the following: “, Series B”. 

(b) The signature page is amended to insert the following signature block after the signature block for the Pass Through Trustee under Pass
Through Trust Agreement for the United Airlines Pass Through Trust, 2018-1A-O: 

WILMINGTON TRUST, NATIONAL 

ASSOCIATION, 
 not in its
individual capacity, 
 except as expressly provided 

herein, but solely as Pass 

Through Trustee under the Pass 

Through Trust Agreement for the 

United Airlines Pass Through 

Trust, 2018-1B-O 

(c) Schedule 1 is amended by inserting after the last row thereof the following: 

 

					
	Wilmington Trust, National Association, as Pass Through Trustee for the 2018-1B Pass Through Trust	  	 Wilmington Trust, National Association

Wilmington, Delaware 19890-1605
 Account No.: 126829-000
 ABA#: 031-100092

Attention: Corporate Trust Administration
 Reference: United
[    ]
	  	 Wilmington Trust, National Association
 1100
North Market Street
 Wilmington, Delaware 19890-1605

Attention: Corporate Trust Administration
 Facsimile: (302) 636-4140

  
 23 

 (d) Schedule 2 is amended by inserting after the last row thereof the following: 

 

					
	2018-1B	  	Series B	  	[    ]

 Section 2.17 Exhibit C – Form of Indenture. Exhibit C to the Note
Purchase Agreement is amended and restated in the form of Exhibit C to this Amendment. 
 Section 2.18 Exhibit
D – Form of Opinion of Hughes Hubbard & Reed LLP. A new Exhibit D is added to the Note Purchase Agreement immediately after Exhibit C thereof in the form of Exhibit D to this Amendment. 

Section 2.19 Exhibit E – Form of Opinion of United Airlines Legal Department. A new Exhibit E is added
to the Note Purchase Agreement immediately after Exhibit D thereof in the form of Exhibit E to this Amendment. 

Section 2.20 Exhibit F – Form of Opinion of Morris James LLP. A new Exhibit F is added to the Note
Purchase Agreement immediately after Exhibit E thereof in the form of Exhibit F to this Amendment. 
 Section 2.21
Exhibit G – Form of Opinion of Lytle Soule & Curlee. A new Exhibit G is added to the Note Purchase Agreement immediately after Exhibit F thereof in the form of Exhibit G to this Amendment. 

Section 2.22 Exhibit H – Form of PA Amendment. A new Exhibit H is added to the Note Purchase Agreement
immediately after Exhibit G thereof in the form of Exhibit H to this Amendment. 

  
 24 

 Section 2.23 Exhibit I – Form of Indenture Amendment. A new
Exhibit I is added to the Note Purchase Agreement immediately after Exhibit H thereof in the form of Exhibit I to this Amendment. 

Section 3. Representations and Warranties. (a) The Company represents and warrants that: 

(i) the Company is duly incorporated, validly existing and in good standing under the laws of the State of Delaware and is a “citizen of
the United States” as defined in Section 40102(a)(15) of the Act, and has the full corporate power, authority and legal right under the laws of the State of Delaware to execute and deliver this Amendment and each Financing Agreement to
which it will be a party and to carry out the obligations of the Company under the Note Purchase Agreement and each Financing Agreement to which it will be a party; 

(ii) the execution and delivery by the Company of this Amendment and the performance by the Company of its obligations under the Note Purchase
Agreement have been duly authorized by the Company and will not violate its Certificate of Incorporation or by-laws or the provisions of any indenture, mortgage, contract or other agreement to which it is a
party or by which it is bound; and 
 (iii) the Note Purchase Agreement constitutes the legal, valid and binding obligation of the Company,
enforceable against it in accordance with its terms, except as the same may be limited by applicable bankruptcy, insolvency, reorganization, moratorium or similar laws affecting the rights of creditors generally and by general principles of equity,
whether considered in a proceeding at law or in equity. 
 (b) WTNA represents and warrants that: 

  
 25 

 (i) WTNA is a national banking association duly incorporated, validly existing and in good
standing under the laws of the United States and is a “citizen of the United States” as defined in Section 40102(a)(15) of the Act, and has the full corporate power, authority and legal right under the laws of the United States and of
the state of the United States in which it is located pertaining to its banking, trust and fiduciary powers to execute and deliver this Amendment and each Financing Agreement to which it will be a party and to carry out the obligations of WTNA, in
its capacity as Subordination Agent, Pass Through Trustee, Paying Agent, Class B Pass Through Trustee or Class B Paying Agent, as the case may be, under the Note Purchase Agreement and each Financing Agreement to which it will be a party;

 (ii) the execution and delivery by WTNA, in its capacity as Subordination Agent, Pass Through Trustee, Paying Agent, Class B Pass
Through Trustee or Class B Paying Agent, as the case may be, of this Amendment and the performance by WTNA, in its capacity as Subordination Agent, Pass Through Trustee, Paying Agent, Class B Pass Through Trustee or Class B Paying
Agent, as the case may be, of its obligations under the Note Purchase Agreement have been duly authorized by WTNA, in its capacity as Subordination Agent, Pass Through Trustee, Paying Agent, Class B Pass Through Trustee or Class B Paying
Agent, as the case may be, and will not violate its articles of association or by-laws or the provisions of any indenture, mortgage, contract or other agreement to which it is a party or by which it is bound;
and 
 (iii) the Note Purchase Agreement constitutes the legal, valid and binding obligations of WTNA, in its capacity as Subordination
Agent, Pass Through Trustee, Paying Agent, Class B Pass Through Trustee or Class B Paying Agent, as the case may be, enforceable against it in accordance with its terms, except as the same may be limited by applicable bankruptcy,
insolvency, reorganization, moratorium or similar laws affecting the rights of creditors generally and by general principles of equity, whether considered in a proceeding at law or in equity. 

  
 26 

 (c) The Pass Through Trustee hereby confirms to each of the other parties hereto that its
representations and warranties set forth in Section 7.15 of the Basic Pass Through Trust Agreement and Section 5.04 of each Trust Supplement relating to the Pass Through Trust Agreements are true and correct as of the date hereof, and the
Class B Pass Through Trustee hereby confirms to each of the other parties hereto that its representations and warranties set forth in Section 7.15 of the Basic Pass Through Trust Agreement and Section 5.04 of the Class B Trust
Supplement are true and correct as of the Class B Issuance Date. 
 (d) The Subordination Agent represents and warrants that: 

(i) the Subordination Agent is a national banking association duly incorporated, validly existing and in good standing under the laws of the
United States, and has the full corporate power, authority and legal right under the laws of the United States and of the state of the United States in which it is located pertaining to its banking, trust and fiduciary powers to execute and deliver
this Amendment and each Financing Agreement to which it is or will be a party and to perform its obligations under the Note Purchase Agreement and each Financing Agreement to which it is or will be a party; 

(ii) this Amendment has been duly authorized, executed and delivered by the Subordination Agent; the Note Purchase Agreement constitutes the
legal, valid and binding obligations of the Subordination Agent enforceable against it in accordance with its terms, except as the same may be limited by applicable bankruptcy, insolvency, reorganization, moratorium or similar laws affecting the
rights of creditors generally and by general principles of equity, whether considered in a proceeding at law or in equity; 

  
 27 

 (iii) none of the execution, delivery and performance by the Subordination Agent of this
Amendment or the performance by the Subordination Agent of the Note Purchase Agreement contravenes any law, rule or regulation of the state of the United States in which it is located or any United States governmental authority or agency regulating
the Subordination Agent’s banking, trust or fiduciary powers or any judgment or order applicable to or binding on the Subordination Agent and do not contravene the Subordination Agent’s articles of association or by-laws or result in any breach of, or constitute a default under, any agreement or instrument to which the Subordination Agent is a party or by which it or any of its properties may be bound; 

(iv) neither the execution and delivery by the Subordination Agent of this Amendment nor the consummation by the Subordination Agent of any of
the transactions contemplated by the Note Purchase Agreement requires the consent or approval of, the giving of notice to, the registration with, or the taking of any other action with respect to, any governmental authority or agency of the state of
the United States in which it is located or any federal governmental authority or agency regulating the Subordination Agent’s banking, trust or fiduciary powers; 

(v) there are no Taxes payable by the Subordination Agent imposed by any state of the United States in which it is located or any political
subdivision or taxing authority thereof in connection with the execution, delivery and performance by the Subordination Agent of this Amendment or the performance by the Subordination Agent of the Note Purchase Agreement (other than franchise or
other taxes based on or measured by any fees or compensation received by the Subordination Agent for services rendered in connection with the transactions contemplated by the Intercreditor Agreement or any of the Series Liquidity Facilities), and
there are no Taxes payable by the Subordination Agent imposed by any state of 

  
 28 

 
the United States in which it is located or any political subdivision thereof in connection with the acquisition, possession or ownership by the Subordination Agent of any of the Equipment Notes
(other than franchise or other taxes based on or measured by any fees or compensation received by the Subordination Agent for services rendered in connection with the transactions contemplated by the Intercreditor Agreement or any of the Series
Liquidity Facilities); and 
 (vi) there are no pending or threatened actions or proceedings against the Subordination Agent before any court
or administrative agency which individually or in the aggregate, if determined adversely to it, would materially adversely affect the ability of the Subordination Agent to perform its obligations under the Note Purchase Agreement. 

(e) The Escrow Agent represents and warrants that: 

(i) the Escrow Agent is a national banking association duly incorporated, validly existing and in good standing under the laws of the United
States and has the full corporate power, authority and legal right under the laws of the United States and the state of the United States in which it is located pertaining to its banking, trust and fiduciary powers to execute and deliver this
Amendment and to carry out the obligations of the Escrow Agent under the Note Purchase Agreement; 
 (ii) the execution and delivery by the
Escrow Agent of the Amendment and the performance by the Escrow Agent of its obligations under the Note Purchase Agreement have been duly authorized by the Escrow Agent and will not violate its articles of association or by-laws or the provisions of any indenture, mortgage, contract or other agreement to which it is a party or by which it is bound; and 

(iii) the Note Purchase Agreement constitutes the legal, valid and binding obligations of the Escrow Agent enforceable against it in accordance
with its terms, except as the same may be limited by applicable bankruptcy, insolvency, reorganization, moratorium or similar laws affecting the rights of creditors generally and by general principles of equity, whether considered in a proceeding at
law or in equity. 

  
 29 

 (f) The Paying Agent represents and warrants that: 

(i) the Paying Agent is a national banking association duly incorporated, validly existing and in good standing under the laws of the United
States of America and has the full corporate power, authority and legal right under the laws of the United States and the state of the United States in which it is located pertaining to its banking, trust and fiduciary powers to execute and deliver
this Amendment and to carry out the obligations of the Paying Agent under the Note Purchase Agreement; 
 (ii) the execution and delivery by
the Paying Agent of this Amendment and the performance by the Paying Agent of its obligations under the Note Purchase Agreement have been duly authorized by the Paying Agent and will not violate its articles of association or by-laws or the provisions of any indenture, mortgage, contract or other agreement to which it is a party or by which it is bound; and 

(iii) the Note Purchase Agreement constitutes the legal, valid and binding obligations of the Paying Agent enforceable against it in accordance
with its terms, except as the same may be limited by applicable bankruptcy, insolvency, reorganization, moratorium or similar laws affecting the rights of creditors generally and by general principles of equity, whether considered in a proceeding at
law or in equity. 
 (g) The Class B Escrow Agent represents and warrants that: 

  
 30 

 (i) the Class B Escrow Agent is a national banking association duly incorporated, validly
existing and in good standing under the laws of the United States and has the full corporate power, authority and legal right under the laws of the United States and the state of the United States in which it is located pertaining to its banking,
trust and fiduciary powers to execute and deliver this Amendment, Class B Deposit Agreement, the Class B Escrow and Paying Agent Agreement (collectively, the “Class B Escrow Agent Agreements”) and to
carry out the obligations of the Class B Escrow Agent under each of the Class B Escrow Agent Agreements; 
 (ii) the execution and
delivery by the Class B Escrow Agent of each of the Class B Escrow Agent Agreements and the performance by the Class B Escrow Agent of its obligations thereunder have been duly authorized by the Class B Escrow Agent and will not
violate its articles of association or by-laws or the provisions of any indenture, mortgage, contract or other agreement to which it is a party or by which it is bound; and 

(iii) each of the Class B Escrow Agent Agreements constitutes the legal, valid and binding obligations of the Class B Escrow Agent
enforceable against it in accordance with its terms, except as the same may be limited by applicable bankruptcy, insolvency, reorganization, moratorium or similar laws affecting the rights of creditors generally and by general principles of equity,
whether considered in a proceeding at law or in equity. 
 (h) The Class B Paying Agent represents and warrants that: 

(i) the Class B Paying Agent is a national banking association duly incorporated, validly existing and in good standing under the laws of
the United States of America and has the full corporate power, authority and legal right under the laws of the United States and the state of the United States in which it is located pertaining to its banking, trust and fiduciary powers to execute
and deliver this Amendment and the Class B Escrow and Paying Agent Agreement (collectively, the “Class B Paying Agent Agreements”) and to carry out the obligations of the Class B Paying Agent under each
of the Class B Paying Agent Agreements; 

  
 31 

 (ii) the execution and delivery by the Class B Paying Agent of each of the Class B
Paying Agent Agreements and the performance by the Class B Paying Agent of its obligations thereunder have been duly authorized by the Class B Paying Agent and will not violate its articles of association or
by-laws or the provisions of any indenture, mortgage, contract or other agreement to which it is a party or by which it is bound; and 

(iii) each of the Class B Paying Agent Agreements constitutes the legal, valid and binding obligations of the Class B Paying Agent
enforceable against it in accordance with its terms, except as the same may be limited by applicable bankruptcy, insolvency, reorganization, moratorium or similar laws affecting the rights of creditors generally and by general principles of equity,
whether considered in a proceeding at law or in equity. 
 Section 4. Additional Parties. By signing below, the
Class B Pass Through Trustee, the Class B Escrow Agent and the Class B Paying Agent each shall be deemed a party to the Note Purchase Agreement. 

Section 5. Construction. Effective as of the date hereof, all references in the Note Purchase Agreement to the
“Note Purchase Agreement” shall be deemed to refer to the Note Purchase Agreement as amended by this Amendment, and the parties hereto confirm their respective obligations thereunder. Except as otherwise specified in this Amendment, the
Note Purchase Agreement shall remain in all respects unchanged and in full force and effect. 
 Section 6. Governing
Law. This Amendment shall be governed by, and construed in accordance with, the law of the State of New York. 

  
 32 

 Section 7. Counterparts. This Amendment may be executed by the parties
hereto in separate counterparts, each of which when so executed and delivered shall be an original, but all such counterparts shall together constitute but one and the same instrument. 

  
 33 

 IN WITNESS WHEREOF, the parties hereto have caused this Amendment to be duly executed by their
respective officers thereunto duly authorized as of the day and year first above written. 
  

			
	UNITED AIRLINES, INC.
		
	By	 	 /s/ Ted Davidson

		 	Name: Ted Davidson
		 	Title:   Vice President Procurement
	
	Address: 233 S. Wacker Drive
		 	          Chicago, IL 60606
		 	          Attention: Treasurer
		 	          Facsimile: (872) 825-0316
	
	 WILMINGTON TRUST, NATIONAL ASSOCIATION

not in its individual capacity, except as expressly provided, but solely as Pass Through Trustee under the Pass Through Trust Agreement for the United Airlines
Pass Through Trust 2018-1AA-O

		
	By	 	 /s/ Chad May

		 	Name: Chad May
		 	Title:   Assistant Vice President
	
	Address: 1100 North Market Street
		 	          Wilmington, Delaware 19890-1605
		 	          Attention: Corporate Trust Administration
		 	          Facsimile: (302) 636-4140

  
 S-1 

Signature Page to Amendment No. 1 to Note Purchase Agreement 18-1 

 
			
	 WILMINGTON TRUST, NATIONAL ASSOCIATION

not in its individual capacity, except as expressly provided, but solely as Pass Through Trustee under the Pass Through Trust Agreement for the United Airlines
Pass Through Trust 2018-1A-O

		
	By	 	 /s/ Chad May

		 	Name: Chad May
		 	Title:   Assistant Vice President
	
	Address: 1100 North Market Street
		 	          Wilmington, Delaware 19890-1605
		 	          Attention: Corporate Trust Administration
		 	          Facsimile: (302) 636-4140
	
	 WILMINGTON TRUST, NATIONAL ASSOCIATION,

not in its individual capacity, except as expressly provided, but solely as Pass Through Trustee under the Pass Through Trust Agreement for the United Airlines
Pass Through Trust 2018-1B-O

		
	By	 	 /s/ Chad May

		 	Name: Chad May
		 	Title:   Assistant Vice President
	
	Address: 1100 North Market Street
		 	          Wilmington, Delaware 19890-1605
		 	          Attention: Corporate Trust Administration
		 	          Facsimile: (302) 636-4140

  
 S-2 

Signature Page to Amendment No. 1 to Note Purchase Agreement 18-1 

 
			
	 WILMINGTON TRUST, NATIONAL

ASSOCIATION,
 not in its
individual capacity, except as otherwise provided herein, but solely as Subordination Agent

		
	By	 	 /s/ Chad May

		 	Name: Chad May
		 	Title:   Assistant Vice President
	
	Address: 1100 North Market Street
		 	          Wilmington, Delaware 19890-1605
		 	          Attention: Corporate Trust Administration
		 	          Facsimile: (302) 636-4140
	
	U.S. BANK NATIONAL ASSOCIATION, as Escrow Agent
		
	By	 	 /s/ David W. Doucette

		 	Name: David W. Doucette
		 	Title:   Vice President
	
	Address: Boston, MA Office
		 	          One Federal Street, 3rd Floor
		 	          EX-MA-FED
		 	          Boston, MA 02110
		 	          Attention: David W. Doucette
		 	          Facsimile: (617) 603-6672

  
 S-3 

Signature Page to Amendment No. 1 to Note Purchase Agreement 18-1 

 
			
	U.S. BANK NATIONAL ASSOCIATION, as Class B Escrow Agent
		
	By	 	 /s/ David W. Doucette

		 	Name: David Doucette
		 	Title:   Vice President
	
	Address: Boston, MA Office
		 	          One Federal Street, 3rd Floor
		 	          EX-MA-FED
		 	          Boston, MA 02110
		 	          Attention: David W. Doucette
		 	          Facsimile: (617) 603-6672
	
	 WILMINGTON TRUST, NATIONAL ASSOCIATION,

as Paying Agent

		
	By	 	 /s/ Chad May

		 	Name: Chad May
		 	Title:   Assistant Vice President
	
	Address: 1100 North Market Street
		 	          Wilmington, Delaware 19890-1605
		 	          Attention: Corporate Trust Administration
		 	          Facsimile: (302) 636-4140

  
 S-4 

Signature Page to Amendment No. 1 to Note Purchase Agreement 18-1 

 
			
	 WILMINGTON TRUST, NATIONAL

ASSOCIATION,
 as
Class B Paying Agent

		
	By	 	 /s/ Chad May

		 	Name: Chad May
		 	Title:   Assistant Vice President
	
	Address: 1100 North Market Street
		 	          Wilmington, Delaware 19890-1605
		 	          Attention: Corporate Trust Administration
		 	          Facsimile: (302) 636-4140

  
 S-5 

Signature Page to Amendment No. 1 to Note Purchase Agreement 18-1 

 SCHEDULE III TO 

Note Purchase Agreement 

REQUIRED TERMS 
 Equipment Notes 

Obligor: United 
 Maximum Principal Amount: 

The initial principal amount and amortization schedule of the Series AA Equipment Notes, Series A Equipment Notes and Series B Equipment Notes issued with
respect to a Remaining Aircraft shall be as set forth in the following table for that Remaining Aircraft: 
 Boeing 737 MAX 9

  

																									
	 	  	N37504	 
	 	  	Equipment Note Ending Balance	 	  	Scheduled Payments of Principal	 
	 Date
	  	Series AA
Equipment
Note	 	  	Series A
Equipment
Note	 	  	Series B
Equipment
Note	 	  	Series AA
Equipment
Note	 	  	Series A
Equipment
Note	 	  	Series B
Equipment
Note	 
	 At Issuance
	  	$	22,336,000.00	 	  	$	8,508,000.00	 	  	$	7,446,000.00	 	  	$	0.00	 	  	$	0.00	 	  	$	0.00	 
	 September 1, 2018
	  	 	22,336,000.00	 	  	 	8,508,000.00	 	  	 	7,446,000.00	 	  	 	0.00	 	  	 	0.00	 	  	 	0.00	 
	 March 1, 2019
	  	 	22,336,000.00	 	  	 	8,508,000.00	 	  	 	7,446,000.00	 	  	 	0.00	 	  	 	0.00	 	  	 	0.00	 
	 September 1, 2019
	  	 	21,782,455.65	 	  	 	8,297,149.57	 	  	 	7,090,990.45	 	  	 	553,544.35	 	  	 	210,850.43	 	  	 	355,009.55	 
	 March 1, 2020
	  	 	21,228,911.30	 	  	 	8,086,299.14	 	  	 	6,735,980.90	 	  	 	553,544.35	 	  	 	210,850.43	 	  	 	355,009.55	 
	 September 1, 2020
	  	 	20,675,366.95	 	  	 	7,875,448.71	 	  	 	6,380,971.35	 	  	 	553,544.35	 	  	 	210,850.43	 	  	 	355,009.55	 
	 March 1, 2021
	  	 	20,121,822.60	 	  	 	7,664,598.28	 	  	 	6,025,961.80	 	  	 	553,544.35	 	  	 	210,850.43	 	  	 	355,009.55	 
	 September 1, 2021
	  	 	19,568,278.25	 	  	 	7,453,747.85	 	  	 	5,670,952.25	 	  	 	553,544.35	 	  	 	210,850.43	 	  	 	355,009.55	 
	 March 1, 2022
	  	 	19,014,733.90	 	  	 	7,242,897.42	 	  	 	5,315,942.70	 	  	 	553,544.35	 	  	 	210,850.43	 	  	 	355,009.55	 
	 September 1, 2022
	  	 	18,461,189.55	 	  	 	7,032,046.99	 	  	 	4,960,933.15	 	  	 	553,544.35	 	  	 	210,850.43	 	  	 	355,009.55	 
	 March 1, 2023
	  	 	17,907,645.20	 	  	 	6,821,196.56	 	  	 	4,605,923.60	 	  	 	553,544.35	 	  	 	210,850.43	 	  	 	355,009.55	 
	 September 1, 2023
	  	 	17,354,100.85	 	  	 	6,610,346.13	 	  	 	4,250,914.05	 	  	 	553,544.35	 	  	 	210,850.43	 	  	 	355,009.55	 
	 March 1, 2024
	  	 	16,800,556.50	 	  	 	6,399,495.70	 	  	 	3,895,904.50	 	  	 	553,544.35	 	  	 	210,850.43	 	  	 	355,009.55	 
	 September 1, 2024
	  	 	16,247,012.15	 	  	 	6,188,645.27	 	  	 	3,540,894.95	 	  	 	553,544.35	 	  	 	210,850.43	 	  	 	355,009.55	 
	 March 1, 2025
	  	 	15,583,775.37	 	  	 	5,936,011.92	 	  	 	3,185,885.40	 	  	 	663,236.78	 	  	 	252,633.35	 	  	 	355,009.55	 
	 September 1, 2025
	  	 	14,920,538.59	 	  	 	5,683,378.57	 	  	 	2,830,875.85	 	  	 	663,236.78	 	  	 	252,633.35	 	  	 	355,009.55	 
	 March 1, 2026
	  	 	14,257,301.81	 	  	 	5,430,745.22	 	  	 	0.00	 	  	 	663,236.78	 	  	 	252,633.35	 	  	 	2,830,875.85	 
	 September 1, 2026
	  	 	13,594,065.03	 	  	 	5,178,111.87	 	  	 	0.00	 	  	 	663,236.78	 	  	 	252,633.35	 	  	 	0.00	 
	 March 1, 2027
	  	 	12,930,828.25	 	  	 	4,925,478.52	 	  	 	0.00	 	  	 	663,236.78	 	  	 	252,633.35	 	  	 	0.00	 
	 September 1, 2027
	  	 	12,267,591.47	 	  	 	4,672,845.17	 	  	 	0.00	 	  	 	663,236.78	 	  	 	252,633.35	 	  	 	0.00	 
	 March 1, 2028
	  	 	11,604,354.69	 	  	 	4,420,211.82	 	  	 	0.00	 	  	 	663,236.78	 	  	 	252,633.35	 	  	 	0.00	 
	 September 1, 2028
	  	 	10,941,117.91	 	  	 	4,167,578.47	 	  	 	0.00	 	  	 	663,236.78	 	  	 	252,633.35	 	  	 	0.00	 
	 March 1, 2029
	  	 	10,277,881.13	 	  	 	3,914,945.12	 	  	 	0.00	 	  	 	663,236.78	 	  	 	252,633.35	 	  	 	0.00	 
	 September 1, 2029
	  	 	9,614,644.35	 	  	 	3,662,311.77	 	  	 	0.00	 	  	 	663,236.78	 	  	 	252,633.35	 	  	 	0.00	 
	 March 1, 2030
	  	 	0.00	 	  	 	0.00	 	  	 	0.00	 	  	 	9,614,644.35	 	  	 	3,662,311.77	 	  	 	0.00	 

																									
	 	  	N37504	 
	 	  	Equipment Note Ending Balance	 	  	Equipment Note Ending Balance	 
	 Date
	  	Series AA
Equipment
Note	 	  	Series A
Equipment
Note	 	  	Series B
Equipment
Note	 	  	Series AA
Equipment
Note	 	  	Series A
Equipment
Note	 	  	Series B
Equipment
Note	 
	 At Issuance
	  	$	22,336,000.00	 	  	$	8,508,000.00	 	  	$	7,446,000.00	 	  	$	0.00	 	  	$	0.00	 	  	$	0.00	 
	 September 1, 2018
	  	 	22,336,000.00	 	  	 	8,508,000.00	 	  	 	7,446,000.00	 	  	 	0.00	 	  	 	0.00	 	  	 	0.00	 
	 March 1, 2019
	  	 	22,336,000.00	 	  	 	8,508,000.00	 	  	 	7,446,000.00	 	  	 	0.00	 	  	 	0.00	 	  	 	0.00	 
	 September 1, 2019
	  	 	21,782,455.65	 	  	 	8,297,149.57	 	  	 	7,090,990.45	 	  	 	553,544.35	 	  	 	210,850.43	 	  	 	355,009.55	 
	 March 1, 2020
	  	 	21,228,911.30	 	  	 	8,086,299.14	 	  	 	6,735,980.90	 	  	 	553,544.35	 	  	 	210,850.43	 	  	 	355,009.55	 
	 September 1, 2020
	  	 	20,675,366.95	 	  	 	7,875,448.71	 	  	 	6,380,971.35	 	  	 	553,544.35	 	  	 	210,850.43	 	  	 	355,009.55	 
	 March 1, 2021
	  	 	20,121,822.60	 	  	 	7,664,598.28	 	  	 	6,025,961.80	 	  	 	553,544.35	 	  	 	210,850.43	 	  	 	355,009.55	 
	 September 1, 2021
	  	 	19,568,278.25	 	  	 	7,453,747.85	 	  	 	5,670,952.25	 	  	 	553,544.35	 	  	 	210,850.43	 	  	 	355,009.55	 
	 March 1, 2022
	  	 	19,014,733.90	 	  	 	7,242,897.42	 	  	 	5,315,942.70	 	  	 	553,544.35	 	  	 	210,850.43	 	  	 	355,009.55	 
	 September 1, 2022
	  	 	18,461,189.55	 	  	 	7,032,046.99	 	  	 	4,960,933.15	 	  	 	553,544.35	 	  	 	210,850.43	 	  	 	355,009.55	 
	 March 1, 2023
	  	 	17,907,645.20	 	  	 	6,821,196.56	 	  	 	4,605,923.60	 	  	 	553,544.35	 	  	 	210,850.43	 	  	 	355,009.55	 
	 September 1, 2023
	  	 	17,354,100.85	 	  	 	6,610,346.13	 	  	 	4,250,914.05	 	  	 	553,544.35	 	  	 	210,850.43	 	  	 	355,009.55	 
	 March 1, 2024
	  	 	16,800,556.50	 	  	 	6,399,495.70	 	  	 	3,895,904.50	 	  	 	553,544.35	 	  	 	210,850.43	 	  	 	355,009.55	 
	 September 1, 2024
	  	 	16,247,012.15	 	  	 	6,188,645.27	 	  	 	3,540,894.95	 	  	 	553,544.35	 	  	 	210,850.43	 	  	 	355,009.55	 
	 March 1, 2025
	  	 	15,583,775.37	 	  	 	5,936,011.92	 	  	 	3,185,885.40	 	  	 	663,236.78	 	  	 	252,633.35	 	  	 	355,009.55	 
	 September 1, 2025
	  	 	14,920,538.59	 	  	 	5,683,378.57	 	  	 	2,830,875.85	 	  	 	663,236.78	 	  	 	252,633.35	 	  	 	355,009.55	 
	 March 1, 2026
	  	 	14,257,301.81	 	  	 	5,430,745.22	 	  	 	0.00	 	  	 	663,236.78	 	  	 	252,633.35	 	  	 	2,830,875.85	 
	 September 1, 2026
	  	 	13,594,065.03	 	  	 	5,178,111.87	 	  	 	0.00	 	  	 	663,236.78	 	  	 	252,633.35	 	  	 	0.00	 
	 March 1, 2027
	  	 	12,930,828.25	 	  	 	4,925,478.52	 	  	 	0.00	 	  	 	663,236.78	 	  	 	252,633.35	 	  	 	0.00	 
	 September 1, 2027
	  	 	12,267,591.47	 	  	 	4,672,845.17	 	  	 	0.00	 	  	 	663,236.78	 	  	 	252,633.35	 	  	 	0.00	 
	 March 1, 2028
	  	 	11,604,354.69	 	  	 	4,420,211.82	 	  	 	0.00	 	  	 	663,236.78	 	  	 	252,633.35	 	  	 	0.00	 
	 September 1, 2028
	  	 	10,941,117.91	 	  	 	4,167,578.47	 	  	 	0.00	 	  	 	663,236.78	 	  	 	252,633.35	 	  	 	0.00	 
	 March 1, 2029
	  	 	10,277,881.13	 	  	 	3,914,945.12	 	  	 	0.00	 	  	 	663,236.78	 	  	 	252,633.35	 	  	 	0.00	 
	 September 1, 2029
	  	 	9,614,644.35	 	  	 	3,662,311.77	 	  	 	0.00	 	  	 	663,236.78	 	  	 	252,633.35	 	  	 	0.00	 
	 March 1, 2030
	  	 	0.00	 	  	 	0.00	 	  	 	0.00	 	  	 	9,614,644.35	 	  	 	3,662,311.77	 	  	 	0.00	 

  

																									
	 	  	N37506	 
	 	  	Equipment Note Ending Balance	 	  	Scheduled Payments of Principal	 
	 Date
	  	Series AA
Equipment
Note	 	  	Series A
Equipment
Note	 	  	Series B
Equipment
Note	 	  	Series AA
Equipment
Note	 	  	Series A
Equipment
Note	 	  	Series B
Equipment
Note	 
	 At Issuance
	  	$	22,336,000.00	 	  	$	8,508,000.00	 	  	$	7,446,000.00	 	  	$	0.00	 	  	$	0.00	 	  	$	0.00	 
	 September 1, 2018
	  	 	22,336,000.00	 	  	 	8,508,000.00	 	  	 	7,446,000.00	 	  	 	0.00	 	  	 	0.00	 	  	 	0.00	 
	 March 1, 2019
	  	 	22,336,000.00	 	  	 	8,508,000.00	 	  	 	7,446,000.00	 	  	 	0.00	 	  	 	0.00	 	  	 	0.00	 
	 September 1, 2019
	  	 	21,782,455.65	 	  	 	8,297,149.57	 	  	 	7,090,990.45	 	  	 	553,544.35	 	  	 	210,850.43	 	  	 	355,009.55	 
	 March 1, 2020
	  	 	21,228,911.30	 	  	 	8,086,299.14	 	  	 	6,735,980.90	 	  	 	553,544.35	 	  	 	210,850.43	 	  	 	355,009.55	 
	 September 1, 2020
	  	 	20,675,366.95	 	  	 	7,875,448.71	 	  	 	6,380,971.35	 	  	 	553,544.35	 	  	 	210,850.43	 	  	 	355,009.55	 
	 March 1, 2021
	  	 	20,121,822.60	 	  	 	7,664,598.28	 	  	 	6,025,961.80	 	  	 	553,544.35	 	  	 	210,850.43	 	  	 	355,009.55	 
	 September 1, 2021
	  	 	19,568,278.25	 	  	 	7,453,747.85	 	  	 	5,670,952.25	 	  	 	553,544.35	 	  	 	210,850.43	 	  	 	355,009.55	 
	 March 1, 2022
	  	 	19,014,733.90	 	  	 	7,242,897.42	 	  	 	5,315,942.70	 	  	 	553,544.35	 	  	 	210,850.43	 	  	 	355,009.55	 
	 September 1, 2022
	  	 	18,461,189.55	 	  	 	7,032,046.99	 	  	 	4,960,933.15	 	  	 	553,544.35	 	  	 	210,850.43	 	  	 	355,009.55	 
	 March 1, 2023
	  	 	17,907,645.20	 	  	 	6,821,196.56	 	  	 	4,605,923.60	 	  	 	553,544.35	 	  	 	210,850.43	 	  	 	355,009.55	 
	 September 1, 2023
	  	 	17,354,100.85	 	  	 	6,610,346.13	 	  	 	4,250,914.05	 	  	 	553,544.35	 	  	 	210,850.43	 	  	 	355,009.55	 
	 March 1, 2024
	  	 	16,800,556.50	 	  	 	6,399,495.70	 	  	 	3,895,904.50	 	  	 	553,544.35	 	  	 	210,850.43	 	  	 	355,009.55	 
	 September 1, 2024
	  	 	16,247,012.15	 	  	 	6,188,645.27	 	  	 	3,540,894.95	 	  	 	553,544.35	 	  	 	210,850.43	 	  	 	355,009.55	 
	 March 1, 2025
	  	 	15,583,775.37	 	  	 	5,936,011.92	 	  	 	3,185,885.40	 	  	 	663,236.78	 	  	 	252,633.35	 	  	 	355,009.55	 
	 September 1, 2025
	  	 	14,920,538.59	 	  	 	5,683,378.57	 	  	 	2,830,875.85	 	  	 	663,236.78	 	  	 	252,633.35	 	  	 	355,009.55	 
	 March 1, 2026
	  	 	14,257,301.81	 	  	 	5,430,745.22	 	  	 	0.00	 	  	 	663,236.78	 	  	 	252,633.35	 	  	 	2,830,875.85	 
	 September 1, 2026
	  	 	13,594,065.03	 	  	 	5,178,111.87	 	  	 	0.00	 	  	 	663,236.78	 	  	 	252,633.35	 	  	 	0.00	 
	 March 1, 2027
	  	 	12,930,828.25	 	  	 	4,925,478.52	 	  	 	0.00	 	  	 	663,236.78	 	  	 	252,633.35	 	  	 	0.00	 
	 September 1, 2027
	  	 	12,267,591.47	 	  	 	4,672,845.17	 	  	 	0.00	 	  	 	663,236.78	 	  	 	252,633.35	 	  	 	0.00	 
	 March 1, 2028
	  	 	11,604,354.69	 	  	 	4,420,211.82	 	  	 	0.00	 	  	 	663,236.78	 	  	 	252,633.35	 	  	 	0.00	 
	 September 1, 2028
	  	 	10,941,117.91	 	  	 	4,167,578.47	 	  	 	0.00	 	  	 	663,236.78	 	  	 	252,633.35	 	  	 	0.00	 
	 March 1, 2029
	  	 	10,277,881.13	 	  	 	3,914,945.12	 	  	 	0.00	 	  	 	663,236.78	 	  	 	252,633.35	 	  	 	0.00	 
	 September 1, 2029
	  	 	9,614,644.35	 	  	 	3,662,311.77	 	  	 	0.00	 	  	 	663,236.78	 	  	 	252,633.35	 	  	 	0.00	 
	 March 1, 2030
	  	 	0.00	 	  	 	0.00	 	  	 	0.00	 	  	 	9,614,644.35	 	  	 	3,662,311.77	 	  	 	0.00	 

  
 2 

 Indenture 

Debt Rate (as such term is defined in Annex A of the form of Indenture marked as Exhibit C of the Note Purchase Agreement (the “Indenture
Form”)) for Series AA (computed on the basis of a 360-day year consisting of twelve 30-day months, payable semi-annually in arrears): 3.50% 

Debt Rate (as such term is defined in Annex A of the Indenture Form) for Series A (computed on the basis of a 360-day
year consisting of twelve 30 day months, payable semi-annually in arrears): 3.70% 
 Debt Rate (as such term is defined in Annex A of the Indenture Form)
for Series B (computed on the basis of a 360-day year consisting of twelve 30-day months, payable semi-annually in arrears): 4.60% 

 

			
	Payment Due Rate:	  	Debt Rate plus 2% per annum
		
	Payment Dates:	  	March 1 and September 1 (after March 1, 2018)
		
	Make-Whole Premiums:	  	As provided in Article II of the Indenture Form
		
	Redemption:	  	As provided in Article II of the Indenture Form
		
	All-risk hull insurance:	  	Not less than the unpaid principal amount of the Equipment Notes relating to an Aircraft, together with six months of interest accrued thereon, subject to United’s right to self-insure on terms no more favorable to United in
any material respect than those set forth in Section G of Annex B to the Indenture Form.

 Participation Agreement 

Mortgagee, Subordination Agent, Liquidity Providers, Pass Through Trustees, Escrow Agents, Class B Pass Through Trustee, Class B Escrow Agent, the
Class B Liquidity Provider and Note Holders indemnified against Expenses and Taxes to the extent set forth in Section 8 of the form of the Participation Agreement marked as Exhibit B to the Note Purchase Agreement. 

  
 3 

 Prohibited Modifications 
  

	1.	May not modify in any material adverse respect the Granting Clause of the Indenture so as to deprive the Note Holders or the Related Note Holders (as defined in the Indenture) of a first priority security interest in
and mortgage lien on the Aircraft or, to the extent assigned thereunder, United’s rights under the Purchase Agreement (as defined in the Indenture) or to eliminate any of the obligations intended to be secured thereby or otherwise modify in any
material adverse respect as regards the interests of the Note Holders, the Related Note Holder of a Related Series AA Equipment Note, the Related Note Holder of a Related Series A Equipment Note, the Related Note Holder of a Related Series B
Equipment Note, the Subordination Agent, the Liquidity Providers, the Class B Liquidity Provider or the Mortgagee the provisions of Article II or III or Section 4.05(c), 5.01, 5.02, 6.02, 10.01(a), 10.01(b)(vii), 11.01, 11.04, 11.11, 11.12
or 11.13 of the Indenture or the definition of “Make-Whole Amount” in Annex A to the Indenture. 

  

	2.	May not modify in any material adverse respect as regards the interests of the Note Holders, the Subordination Agent, the Liquidity Providers, the Class B Liquidity Provider or the Mortgagee the provisions of
Section 4.1.3, 4.1.8, 4.1.9, 4.1.10, 4.1.11, 6.1.3(b), 6.3, 10, 12.8(a) or 12.9 of the Participation Agreement, of the provisions of Section 4.1.2(x) of the Participation Agreement so as to eliminate the requirement to deliver to the
Subordination Agent or the Mortgagee, as the case may be, the legal opinions to be provided to such Persons thereunder (recognizing that the lawyers rendering such opinions may be changed) or of the provisions of Section 6.4.5(a)(ii) of the
Participation Agreement as regards the rights of the Mortgagee thereunder or otherwise modify the terms of the Participation Agreement to deprive the Pass Through Trustees, the Class B Pass Through Trustee, the Subordination Agent, the
Liquidity Providers, the Class B Liquidity Provider or the Mortgagee of any indemnity or right of reimbursement in its favor for Expenses or Taxes. 

Notwithstanding the foregoing, any form of Financing Agreement may be modified to correct or supplement any such provision which may be defective or to cure
any ambiguity or correct any mistake, provided that any such action shall not materially adversely affect the interests of the Note Holders, the Related Note Holder of a Related Series AA Equipment Note, the Related Note Holder of a Related
Series A Equipment Note, the Related Note Holder of a Related Series B Equipment Note, the Subordination Agent, the Liquidity Providers, the Class B Liquidity Provider, the Mortgagee, the registered holders of Class B Certificates or the
Certificateholders. 

  
 4 

 SCHEDULE IV 

AMENDED INDENTURES 
  

									
	 Amended Indenture
	  	Aircraft Model	  	Registration
Number	  	Manufacturer’s Serial
Number	  	Original
Principal
Amount of
Series B
Equipment Notes
	 Trust Indenture and Mortgage 541, dated as of February 15, 2018
	  	Boeing 737-800	  	N79541	  	63725	  	$6,788,000
	 Trust Indenture and Mortgage 542, dated as of February 15, 2018
	  	Boeing 737-800	  	N77542	  	63647	  	6,792,000
	 Trust Indenture and Mortgage 501, dated as of April 24, 2018
	  	Boeing 737 MAX 9	  	N67501	  	43430	  	7,433,000
	 Trust Indenture and Mortgage 502, dated as of April 30, 2018
	  	Boeing 737 MAX 9	  	N37502	  	43431	  	7,433,000
	 Trust Indenture and Mortgage 503, dated as of May 3, 2018
	  	Boeing 737 MAX 9	  	N27503	  	43434	  	7,433,000
	 Trust Indenture and Mortgage 970, dated as of February 15, 2018
	  	Boeing 787-9	  	N26970	  	60146	  	19,622,000
	 Trust Indenture and Mortgage 971, dated as of February 15, 2018
	  	Boeing 787-9	  	N29971	  	60147	  	20,072,000
	 Trust Indenture and Mortgage 972, dated as of February 15, 2018
	  	Boeing 787-9	  	N24972	  	40939	  	20,072,000
	 Trust Indenture and Mortgage 973, dated as of February 15, 2018
	  	Boeing 787-9	  	N24973	  	40941	  	20,089,000
	 Trust Indenture and Mortgage 974, dated as of February 21, 2018
	  	Boeing 787-9	  	N24974	  	40942	  	20,089,000
	 Trust Indenture and Mortgage N2645U, dated as of March 21, 2018
	  	Boeing 777-300ER	  	N2645U	  	64989	  	22,517,000
	 Trust Indenture and Mortgage N2846U, dated as of March 28, 2018
	  	Boeing 777-300ER	  	N2846U	  	64990	  	22,517,000
	 Trust Indenture and Mortgage N2747U, dated as of April 20, 2018
	  	Boeing 777-300ER	  	N2747U	  	64991	  	22,534,000

 Series B Equipment Note Amortization Schedules 

A. Boeing 737-800 
  

									
	 	  	N79541	 
	 	  	Series B
Equipment Note
Ending Balance	 	  	Scheduled
Payments of
Principal	 
	 Date
	  				  			
	 At Issuance
	  	$	6,788,000.00	 	  	$	0.00	 
	 September 1, 2018
	  	 	6,788,000.00	 	  	 	0.00	 
	 March 1, 2019
	  	 	6,464,359.09	 	  	 	323,640.91	 
	 September 1, 2019
	  	 	6,140,721.59	 	  	 	323,637.50	 
	 March 1, 2020
	  	 	5,817,084.09	 	  	 	323,637.50	 
	 September 1, 2020
	  	 	5,493,446.59	 	  	 	323,637.50	 
	 March 1, 2021
	  	 	5,169,809.09	 	  	 	323,637.50	 
	 September 1, 2021
	  	 	4,846,171.59	 	  	 	323,637.50	 
	 March 1, 2022
	  	 	4,522,534.09	 	  	 	323,637.50	 
	 September 1, 2022
	  	 	4,198,896.59	 	  	 	323,637.50	 
	 March 1, 2023
	  	 	3,875,259.09	 	  	 	323,637.50	 
	 September 1, 2023
	  	 	3,551,621.59	 	  	 	323,637.50	 
	 March 1, 2024
	  	 	3,227,984.09	 	  	 	323,637.50	 
	 September 1, 2024
	  	 	2,904,346.59	 	  	 	323,637.50	 
	 March 1, 2025
	  	 	2,580,709.09	 	  	 	323,637.50	 
	 September 1, 2025
	  	 	2,257,071.59	 	  	 	323,637.50	 
	 March 1, 2026
	  	 	0.00	 	  	 	2,257,071.59	 

  

									
	 	  	N77542	 
	 	  	Series B
Equipment Note
Ending Balance	 	  	Scheduled
Payments of
Principal	 
	 Date
	  				  			
	 At Issuance
	  	$	6,792,000.00	 	  	$	0.00	 
	 September 1, 2018
	  	 	6,792,000.00	 	  	 	0.00	 
	 March 1, 2019
	  	 	6,468,168.37	 	  	 	323,831.63	 
	 September 1, 2019
	  	 	6,144,340.16	 	  	 	323,828.21	 
	 March 1, 2020
	  	 	5,820,511.95	 	  	 	323,828.21	 
	 September 1, 2020
	  	 	5,496,683.74	 	  	 	323,828.21	 
	 March 1, 2021
	  	 	5,172,855.53	 	  	 	323,828.21	 
	 September 1, 2021
	  	 	4,849,027.32	 	  	 	323,828.21	 
	 March 1, 2022
	  	 	4,525,199.11	 	  	 	323,828.21	 
	 September 1, 2022
	  	 	4,201,370.90	 	  	 	323,828.21	 
	 March 1, 2023
	  	 	3,877,542.69	 	  	 	323,828.21	 
	 September 1, 2023
	  	 	3,553,714.48	 	  	 	323,828.21	 
	 March 1, 2024
	  	 	3,229,886.27	 	  	 	323,828.21	 
	 September 1, 2024
	  	 	2,906,058.06	 	  	 	323,828.21	 
	 March 1, 2025
	  	 	2,582,229.85	 	  	 	323,828.21	 
	 September 1, 2025
	  	 	2,258,401.64	 	  	 	323,828.21	 
	 March 1, 2026
	  	 	0.00	 	  	 	2,258,401.64	 

  
 IV-2 

 B. Boeing 737 MAX 9 
  

									
	 	  	N67501	 
	 	  	Series B
Equipment Note
Ending Balance	 	  	Scheduled
Payments of
Principal	 
	 Date
	  				  			
	 At Issuance
	  	$	7,433,000.00	 	  	$	0.00	 
	 September 1, 2018
	  	 	7,433,000.00	 	  	 	0.00	 
	 March 1, 2019
	  	 	7,433,000.00	 	  	 	0.00	 
	 September 1, 2019
	  	 	7,078,610.26	 	  	 	354,389.74	 
	 March 1, 2020
	  	 	6,724,220.52	 	  	 	354,389.74	 
	 September 1, 2020
	  	 	6,369,830.78	 	  	 	354,389.74	 
	 March 1, 2021
	  	 	6,015,441.04	 	  	 	354,389.74	 
	 September 1, 2021
	  	 	5,661,051.30	 	  	 	354,389.74	 
	 March 1, 2022
	  	 	5,306,661.56	 	  	 	354,389.74	 
	 September 1, 2022
	  	 	4,952,271.82	 	  	 	354,389.74	 
	 March 1, 2023
	  	 	4,597,882.08	 	  	 	354,389.74	 
	 September 1, 2023
	  	 	4,243,492.34	 	  	 	354,389.74	 
	 March 1, 2024
	  	 	3,889,102.60	 	  	 	354,389.74	 
	 September 1, 2024
	  	 	3,534,712.86	 	  	 	354,389.74	 
	 March 1, 2025
	  	 	3,180,323.12	 	  	 	354,389.74	 
	 September 1, 2025
	  	 	2,825,933.38	 	  	 	354,389.74	 
	 March 1, 2026
	  	 	0.00	 	  	 	2,825,933.38	 

  

									
	 	  	N37502	 
	 	  	Series B
Equipment Note
Ending Balance	 	  	Scheduled
Payments of
Principal	 
	 Date
	  				  			
	 At Issuance
	  	$	7,433,000.00	 	  	$	0.00	 
	 September 1, 2018
	  	 	7,433,000.00	 	  	 	0.00	 
	 March 1, 2019
	  	 	7,433,000.00	 	  	 	0.00	 
	 September 1, 2019
	  	 	7,078,610.26	 	  	 	354,389.74	 
	 March 1, 2020
	  	 	6,724,220.52	 	  	 	354,389.74	 
	 September 1, 2020
	  	 	6,369,830.78	 	  	 	354,389.74	 
	 March 1, 2021
	  	 	6,015,441.04	 	  	 	354,389.74	 
	 September 1, 2021
	  	 	5,661,051.30	 	  	 	354,389.74	 
	 March 1, 2022
	  	 	5,306,661.56	 	  	 	354,389.74	 
	 September 1, 2022
	  	 	4,952,271.82	 	  	 	354,389.74	 
	 March 1, 2023
	  	 	4,597,882.08	 	  	 	354,389.74	 
	 September 1, 2023
	  	 	4,243,492.34	 	  	 	354,389.74	 
	 March 1, 2024
	  	 	3,889,102.60	 	  	 	354,389.74	 
	 September 1, 2024
	  	 	3,534,712.86	 	  	 	354,389.74	 
	 March 1, 2025
	  	 	3,180,323.12	 	  	 	354,389.74	 
	 September 1, 2025
	  	 	2,825,933.38	 	  	 	354,389.74	 
	 March 1, 2026
	  	 	0.00	 	  	 	2,825,933.38	 

  
 IV-3 

									
	 	  	N27503	 
	 	  	Series B
Equipment Note
Ending Balance	 	  	Scheduled
Payments of
Principal	 
	 Date
	  				  			
	 At Issuance
	  	$	7,433,000.00	 	  	$	0.00	 
	 September 1, 2018
	  	 	7,433,000.00	 	  	 	0.00	 
	 March 1, 2019
	  	 	7,433,000.00	 	  	 	0.00	 
	 September 1, 2019
	  	 	7,078,610.26	 	  	 	354,389.74	 
	 March 1, 2020
	  	 	6,724,220.52	 	  	 	354,389.74	 
	 September 1, 2020
	  	 	6,369,830.78	 	  	 	354,389.74	 
	 March 1, 2021
	  	 	6,015,441.04	 	  	 	354,389.74	 
	 September 1, 2021
	  	 	5,661,051.30	 	  	 	354,389.74	 
	 March 1, 2022
	  	 	5,306,661.56	 	  	 	354,389.74	 
	 September 1, 2022
	  	 	4,952,271.82	 	  	 	354,389.74	 
	 March 1, 2023
	  	 	4,597,882.08	 	  	 	354,389.74	 
	 September 1, 2023
	  	 	4,243,492.34	 	  	 	354,389.74	 
	 March 1, 2024
	  	 	3,889,102.60	 	  	 	354,389.74	 
	 September 1, 2024
	  	 	3,534,712.86	 	  	 	354,389.74	 
	 March 1, 2025
	  	 	3,180,323.12	 	  	 	354,389.74	 
	 September 1, 2025
	  	 	2,825,933.38	 	  	 	354,389.74	 
	 March 1, 2026
	  	 	0.00	 	  	 	2,825,933.38	 

 C. Boeing 787-9 

 

									
	 	  	N26970	 
	 	  	Series B
Equipment Note
Ending Balance	 	  	Scheduled
Payments of
Principal	 
	 Date
	  				  			
	 At Issuance
	  	$	19,622,000.00	 	  	$	0.00	 
	 September 1, 2018
	  	 	19,622,000.00	 	  	 	0.00	 
	 March 1, 2019
	  	 	18,686,454.63	 	  	 	935,545.37	 
	 September 1, 2019
	  	 	17,750,919.12	 	  	 	935,535.51	 
	 March 1, 2020
	  	 	16,815,383.61	 	  	 	935,535.51	 
	 September 1, 2020
	  	 	15,879,848.10	 	  	 	935,535.51	 
	 March 1, 2021
	  	 	14,944,312.59	 	  	 	935,535.51	 
	 September 1, 2021
	  	 	14,008,777.08	 	  	 	935,535.51	 
	 March 1, 2022
	  	 	13,073,241.57	 	  	 	935,535.51	 
	 September 1, 2022
	  	 	12,137,706.06	 	  	 	935,535.51	 
	 March 1, 2023
	  	 	11,202,170.55	 	  	 	935,535.51	 
	 September 1, 2023
	  	 	10,266,635.04	 	  	 	935,535.51	 
	 March 1, 2024
	  	 	9,331,099.53	 	  	 	935,535.51	 
	 September 1, 2024
	  	 	8,395,564.02	 	  	 	935,535.51	 
	 March 1, 2025
	  	 	7,460,028.51	 	  	 	935,535.51	 
	 September 1, 2025
	  	 	6,524,493.00	 	  	 	935,535.51	 
	 March 1, 2026
	  	 	0.00	 	  	 	6,524,493.00	 

  
 IV-4 

									
	 	  	N29971	 
	 	  	Series B
Equipment Note
Ending Balance	 	  	Scheduled
Payments of
Principal	 
	 Date
	  				  			
	 At Issuance
	  	$	20,072,000.00	 	  	$	0.00	 
	 September 1, 2018
	  	 	20,072,000.00	 	  	 	0.00	 
	 March 1, 2019
	  	 	19,114,999.35	 	  	 	957,000.65	 
	 September 1, 2019
	  	 	18,158,008.79	 	  	 	956,990.56	 
	 March 1, 2020
	  	 	17,201,018.23	 	  	 	956,990.56	 
	 September 1, 2020
	  	 	16,244,027.67	 	  	 	956,990.56	 
	 March 1, 2021
	  	 	15,287,037.11	 	  	 	956,990.56	 
	 September 1, 2021
	  	 	14,330,046.55	 	  	 	956,990.56	 
	 March 1, 2022
	  	 	13,373,055.99	 	  	 	956,990.56	 
	 September 1, 2022
	  	 	12,416,065.43	 	  	 	956,990.56	 
	 March 1, 2023
	  	 	11,459,074.87	 	  	 	956,990.56	 
	 September 1, 2023
	  	 	10,502,084.31	 	  	 	956,990.56	 
	 March 1, 2024
	  	 	9,545,093.75	 	  	 	956,990.56	 
	 September 1, 2024
	  	 	8,588,103.19	 	  	 	956,990.56	 
	 March 1, 2025
	  	 	7,631,112.63	 	  	 	956,990.56	 
	 September 1, 2025
	  	 	6,674,122.07	 	  	 	956,990.56	 
	 March 1, 2026
	  	 	0.00	 	  	 	6,674,122.07	 

  

									
	 	  	N24972	 
	 	  	Series B
Equipment Note
Ending Balance	 	  	Scheduled
Payments of
Principal	 
	 Date
	  				  			
	 At Issuance
	  	$	20,072,000.00	 	  	$	0.00	 
	 September 1, 2018
	  	 	20,072,000.00	 	  	 	0.00	 
	 March 1, 2019
	  	 	19,114,999.35	 	  	 	957,000.65	 
	 September 1, 2019
	  	 	18,158,008.79	 	  	 	956,990.56	 
	 March 1, 2020
	  	 	17,201,018.23	 	  	 	956,990.56	 
	 September 1, 2020
	  	 	16,244,027.67	 	  	 	956,990.56	 
	 March 1, 2021
	  	 	15,287,037.11	 	  	 	956,990.56	 
	 September 1, 2021
	  	 	14,330,046.55	 	  	 	956,990.56	 
	 March 1, 2022
	  	 	13,373,055.99	 	  	 	956,990.56	 
	 September 1, 2022
	  	 	12,416,065.43	 	  	 	956,990.56	 
	 March 1, 2023
	  	 	11,459,074.87	 	  	 	956,990.56	 
	 September 1, 2023
	  	 	10,502,084.31	 	  	 	956,990.56	 
	 March 1, 2024
	  	 	9,545,093.75	 	  	 	956,990.56	 
	 September 1, 2024
	  	 	8,588,103.19	 	  	 	956,990.56	 
	 March 1, 2025
	  	 	7,631,112.63	 	  	 	956,990.56	 
	 September 1, 2025
	  	 	6,674,122.07	 	  	 	956,990.56	 
	 March 1, 2026
	  	 	0.00	 	  	 	6,674,122.07	 

  
 IV-5 

									
	 	  	N24973	 
	 	  	Series B
Equipment Note
Ending Balance	 	  	Scheduled
Payments of
Principal	 
	 Date
	  				  			
	 At Issuance
	  	$	20,089,000.00	 	  	$	0.00	 
	 September 1, 2018
	  	 	20,089,000.00	 	  	 	0.00	 
	 March 1, 2019
	  	 	19,131,188.82	 	  	 	957,811.18	 
	 September 1, 2019
	  	 	18,173,387.74	 	  	 	957,801.08	 
	 March 1, 2020
	  	 	17,215,586.66	 	  	 	957,801.08	 
	 September 1, 2020
	  	 	16,257,785.58	 	  	 	957,801.08	 
	 March 1, 2021
	  	 	15,299,984.50	 	  	 	957,801.08	 
	 September 1, 2021
	  	 	14,342,183.42	 	  	 	957,801.08	 
	 March 1, 2022
	  	 	13,384,382.34	 	  	 	957,801.08	 
	 September 1, 2022
	  	 	12,426,581.26	 	  	 	957,801.08	 
	 March 1, 2023
	  	 	11,468,780.18	 	  	 	957,801.08	 
	 September 1, 2023
	  	 	10,510,979.10	 	  	 	957,801.08	 
	 March 1, 2024
	  	 	9,553,178.02	 	  	 	957,801.08	 
	 September 1, 2024
	  	 	8,595,376.94	 	  	 	957,801.08	 
	 March 1, 2025
	  	 	7,637,575.86	 	  	 	957,801.08	 
	 September 1, 2025
	  	 	6,679,774.78	 	  	 	957,801.08	 
	 March 1, 2026
	  	 	0.00	 	  	 	6,679,774.78	 

  

									
	 	  	N24974	 
	 	  	Series B
Equipment Note
Ending Balance	 	  	Scheduled
Payments of
Principal	 
	 Date
	  				  			
	 At Issuance
	  	$	20,089,000.00	 	  	$	0.00	 
	 September 1, 2018
	  	 	20,089,000.00	 	  	 	0.00	 
	 March 1, 2019
	  	 	19,131,188.82	 	  	 	957,811.18	 
	 September 1, 2019
	  	 	18,173,387.74	 	  	 	957,801.08	 
	 March 1, 2020
	  	 	17,215,586.66	 	  	 	957,801.08	 
	 September 1, 2020
	  	 	16,257,785.58	 	  	 	957,801.08	 
	 March 1, 2021
	  	 	15,299,984.50	 	  	 	957,801.08	 
	 September 1, 2021
	  	 	14,342,183.42	 	  	 	957,801.08	 
	 March 1, 2022
	  	 	13,384,382.34	 	  	 	957,801.08	 
	 September 1, 2022
	  	 	12,426,581.26	 	  	 	957,801.08	 
	 March 1, 2023
	  	 	11,468,780.18	 	  	 	957,801.08	 
	 September 1, 2023
	  	 	10,510,979.10	 	  	 	957,801.08	 
	 March 1, 2024
	  	 	9,553,178.02	 	  	 	957,801.08	 
	 September 1, 2024
	  	 	8,595,376.94	 	  	 	957,801.08	 
	 March 1, 2025
	  	 	7,637,575.86	 	  	 	957,801.08	 
	 September 1, 2025
	  	 	6,679,774.78	 	  	 	957,801.08	 
	 March 1, 2026
	  	 	0.00	 	  	 	6,679,774.78	 

  
 IV-6 

 D. Boeing 777-300ER 

 

									
	 	  	N2645U	 
	 	  	Series B
Equipment Note
Ending Balance	 	  	Scheduled
Payments of
Principal	 
	 Date
	  				  			
	 At Issuance
	  	$	22,517,000.00	 	  	$	0.00	 
	 September 1, 2018
	  	 	22,517,000.00	 	  	 	0.00	 
	 March 1, 2019
	  	 	21,443,425.69	 	  	 	1,073,574.31	 
	 September 1, 2019
	  	 	20,369,862.70	 	  	 	1,073,562.99	 
	 March 1, 2020
	  	 	19,296,299.71	 	  	 	1,073,562.99	 
	 September 1, 2020
	  	 	18,222,736.72	 	  	 	1,073,562.99	 
	 March 1, 2021
	  	 	17,149,173.73	 	  	 	1,073,562.99	 
	 September 1, 2021
	  	 	16,075,610.74	 	  	 	1,073,562.99	 
	 March 1, 2022
	  	 	15,002,047.75	 	  	 	1,073,562.99	 
	 September 1, 2022
	  	 	13,928,484.76	 	  	 	1,073,562.99	 
	 March 1, 2023
	  	 	12,854,921.77	 	  	 	1,073,562.99	 
	 September 1, 2023
	  	 	11,781,358.78	 	  	 	1,073,562.99	 
	 March 1, 2024
	  	 	10,707,795.79	 	  	 	1,073,562.99	 
	 September 1, 2024
	  	 	9,634,232.80	 	  	 	1,073,562.99	 
	 March 1, 2025
	  	 	8,560,669.81	 	  	 	1,073,562.99	 
	 September 1, 2025
	  	 	7,487,106.82	 	  	 	1,073,562.99	 
	 March 1, 2026
	  	 	0.00	 	  	 	7,487,106.82	 

  

									
	 	  	N2846U	 
	 	  	Series B
Equipment Note
Ending Balance	 	  	Scheduled
Payments of
Principal	 
	 Date
	  				  			
	 At Issuance
	  	$	22,517,000.00	 	  	$	0.00	 
	 September 1, 2018
	  	 	22,517,000.00	 	  	 	0.00	 
	 March 1, 2019
	  	 	21,443,425.67	 	  	 	1,073,574.33	 
	 September 1, 2019
	  	 	20,369,862.68	 	  	 	1,073,562.99	 
	 March 1, 2020
	  	 	19,296,299.69	 	  	 	1,073,562.99	 
	 September 1, 2020
	  	 	18,222,736.70	 	  	 	1,073,562.99	 
	 March 1, 2021
	  	 	17,149,173.71	 	  	 	1,073,562.99	 
	 September 1, 2021
	  	 	16,075,610.72	 	  	 	1,073,562.99	 
	 March 1, 2022
	  	 	15,002,047.73	 	  	 	1,073,562.99	 
	 September 1, 2022
	  	 	13,928,484.74	 	  	 	1,073,562.99	 
	 March 1, 2023
	  	 	12,854,921.75	 	  	 	1,073,562.99	 
	 September 1, 2023
	  	 	11,781,358.76	 	  	 	1,073,562.99	 
	 March 1, 2024
	  	 	10,707,795.77	 	  	 	1,073,562.99	 
	 September 1, 2024
	  	 	9,634,232.78	 	  	 	1,073,562.99	 
	 March 1, 2025
	  	 	8,560,669.79	 	  	 	1,073,562.99	 
	 September 1, 2025
	  	 	7,487,106.80	 	  	 	1,073,562.99	 
	 March 1, 2026
	  	 	0.00	 	  	 	7,487,106.80	 

  
 IV-7 

									
	 	  	N2747U	 
	 	  	Series B
Equipment Note
Ending Balance	 	  	Scheduled
Payments of
Principal	 
	 Date
	  				  			
	 At Issuance
	  	$	22,534,000.00	 	  	$	0.00	 
	 September 1, 2018
	  	 	22,534,000.00	 	  	 	0.00	 
	 March 1, 2019
	  	 	22,534,000.00	 	  	 	0.00	 
	 September 1, 2019
	  	 	21,459,626.51	 	  	 	1,074,373.49	 
	 March 1, 2020
	  	 	20,385,253.02	 	  	 	1,074,373.49	 
	 September 1, 2020
	  	 	19,310,879.53	 	  	 	1,074,373.49	 
	 March 1, 2021
	  	 	18,236,506.04	 	  	 	1,074,373.49	 
	 September 1, 2021
	  	 	17,162,132.55	 	  	 	1,074,373.49	 
	 March 1, 2022
	  	 	16,087,759.06	 	  	 	1,074,373.49	 
	 September 1, 2022
	  	 	15,013,385.57	 	  	 	1,074,373.49	 
	 March 1, 2023
	  	 	13,939,012.08	 	  	 	1,074,373.49	 
	 September 1, 2023
	  	 	12,864,638.59	 	  	 	1,074,373.49	 
	 March 1, 2024
	  	 	11,790,265.10	 	  	 	1,074,373.49	 
	 September 1, 2024
	  	 	10,715,891.61	 	  	 	1,074,373.49	 
	 March 1, 2025
	  	 	9,641,518.12	 	  	 	1,074,373.49	 
	 September 1, 2025
	  	 	8,567,144.63	 	  	 	1,074,373.49	 
	 March 1, 2026
	  	 	0.00	 	  	 	8,567,144.63	 

  

  
 IV-8 

 EXHIBIT A 

TO 
 NOTE PURCHASE AGREEMENT 

CLOSING NOTICE 
 Dated as
of [                ] 
 To each of the addressees listed 

in Schedule A hereto 
  

	 	Re:	Closing Notice in accordance with Note Purchase Agreement referred to below 

 Ladies and Gentlemen: 

Reference is made to the Note Purchase Agreement, dated as of February 14, 2018, as amended by Amendment No. 1 to Note Purchase
Agreement, dated as of May 23, 2018, among United Airlines, Inc. (the “Company”), Wilmington Trust, National Association, as Pass Through Trustee under each of the Pass Through Trust Agreements (as defined therein) (the
“Pass Through Trustee”), Wilmington Trust, National Association, as Subordination Agent (the “Subordination Agent”), U.S. Bank National Association, as Escrow Agent (the “Escrow Agent”), Wilmington
Trust, National Association, as Paying Agent (the “Paying Agent”), the Class B Pass Through Trustee, the Class B Escrow Agent and the Class B Paying Agent (as each such term is defined therein) (as in effect from time
to time, the “Note Purchase Agreement”). Unless otherwise defined herein, capitalized terms used herein shall have the meanings set forth in the Note Purchase Agreement or, to the extent not defined therein, the Intercreditor
Agreement. 
 Pursuant to Section 1(b) of the Note Purchase Agreement, the undersigned hereby notifies you, in respect of the Boeing
Model [                ] aircraft with manufacturer’s serial number [            ] (the
“Aircraft”), of the following: 
  

	(1)	The Scheduled Closing Date of the Aircraft is [                    ]; 

 

	(2)	The Funding Date for the Aircraft shall be [                ]; and 

 

	(3)	The aggregate amount of each series of Equipment Notes to be issued, and purchased by the respective Pass Through Trustees and the Class B Pass Through Trustee referred to below (each, an “Applicable Pass
Through Trustee”), on the Funding Date, in connection with the financing of such Aircraft is as follows: 

  

	 	(a)	the Class AA Pass Through Trustee shall purchase Series AA Equipment Notes in the amount of
$[                    ]; 

	 	(b)	the Class A Pass Through Trustee shall purchase Series A Equipment Notes in the amount of $[            ]; and 

 

	 	(c)	the Class B Pass Through Trustee shall purchase Series B Equipment Notes in the amount of $[            ]. 

The Company hereby instructs the Class AA Pass Through Trustee to (i) execute a Withdrawal Certificate in the form of Annex A hereto
dated as of [                ] and attach thereto a Notice of Purchase Withdrawal dated such date completed as set forth on Exhibit A hereto and (ii) deliver
such Withdrawal Certificate and Notice of Purchase Withdrawal to the applicable Escrow Agent. 
 The Company hereby instructs the
Class A Pass Through Trustee to (i) execute a Withdrawal Certificate in the form of Annex A hereto dated as of
[                    ] and attach thereto a Notice of Purchase Withdrawal dated such date completed as set forth on Exhibit B hereto and
(ii) deliver such Withdrawal Certificate and Notice of Purchase Withdrawal to the applicable Escrow Agent. 
 The Company hereby
instructs the Class B Pass Through Trustee to (i) execute a Withdrawal Certificate in the form of Annex A hereto dated as of
[                    ] and attach thereto a Notice of Purchase Withdrawal dated such date completed as set forth on Exhibit C hereto and
(ii) deliver such Withdrawal Certificate and Notice of Purchase Withdrawal to the Class B Escrow Agent. 
 The Company hereby
instructs each Applicable Pass Through Trustee to (i) purchase Equipment Notes of a series and in an amount set forth opposite such Applicable Pass Through Trustee in clause (3) above with a portion of the proceeds of the withdrawals of
Deposits referred to in the applicable Notice of Purchase Withdrawal referred to above and (ii) re-deposit with the Depositary the excess, if any, of the amount so withdrawn over the purchase price
of such Equipment Notes. 
 The Company hereby instructs each Applicable Pass Through Trustee to (a) enter into the Participation
Agreement [                ] dated as of [                ] among the
Company, as Owner, and Wilmington Trust, National Association, as Mortgagee, Subordination Agent and each Applicable Pass Through Trustee, (b) perform its obligations thereunder and (c) deliver such certificates, documents and legal
opinions relating to such Applicable Pass Through Trustee as required thereby. 

  
 -2- 

 
			
	Yours faithfully,
	
	United Airlines, Inc.
		
	By:	 	  

		 	Name:
		 	Title:

  
 -3- 

 SCHEDULE A 

Wilmington Trust, National Association, as 
 Pass
Through Trustee, Class B Pass Through Trustee, Subordination 
 Agent, Paying Agent and Class B Paying Agent 

1100 North Market Street 
 Wilmington, Delaware 19890-1605 

Attention: Corporate Trust Administration 
 Facsimile: (302) 636-4140 
 U.S. Bank National Association, 

as Escrow Agent and Class B Escrow Agent 

Boston, MA Office 
 One Federal Street, 3rd Floor 

EX-MA-FED 

Boston, MA 02110 
 Attention: David W. Doucette 

Facsimile: (617) 603-6672 

Citibank, N.A. 
 as Depositary, 

480 Washington Blvd., 18th Floor 
 Jersey City, NJ 07310 

Attention: Agency & Trust Payment Group 
 E-mail: cts.spag@citi.com 

 Moody’s Investors Service, Inc. 

7 World Trade Center at 250 Greenwich Street 
 New York, New York
10007 
 Attention: Jonathan Root 
 Facsimile: 212-553-4661 
 Fitch Ratings, Inc. 

1 State Street 
 New York, New York 10004 

Attention: Joe Rohlena 
 Facsimile: (212) 558-2564 

 Annex A 

WITHDRAWAL CERTIFICATE 
 (Class
    ) 
 U.S. Bank National Association, 

as Escrow Agent 
 Ladies and Gentlemen: 

Reference is made to the Escrow and Paying Agent Agreement, dated as of [February 14] [May 23], 2018 (the “Agreement”). We hereby certify to you that
the conditions to the obligations of the undersigned to execute a Participation Agreement pursuant to the Note Purchase Agreement have been satisfied. Pursuant to Section 1.02(c) of the Agreement, please execute the attached Notice of Purchase
Withdrawal and immediately transmit by E-mail to the Depositary, at cts.spag@citi.com (Attention: Agency & Trust Payment Group). 

Capitalized terms used herein but not defined herein shall have the meanings set forth in the Agreement. 

 

			
	Very truly yours,
	
	 WILMINGTON TRUST, NATIONAL ASSOCIATION,

not in its individual capacity but solely as each Applicable Pass Through Trustee

			
		
	By:	 	  

 
			
		 	Name:
		 	Title:

 Dated: As of [                ]

 Exhibit A 

NOTICE OF PURCHASE WITHDRAWAL 
 Citibank, N.A.

 as Depositary, 
 480 Washington Blvd., 18th
Floor 
 Jersey City, NJ 07310 
 Attention: Agency &
Trust Payment Group 
 E-mail: cts.spag@citi.com 

Ladies and Gentlemen: 
 Reference is made to the
Deposit Agreement (Class AA) dated as of February 14, 2018 (the “Deposit Agreement”) between U.S. Bank National Association, as Escrow Agent, and Citibank, N.A., as Depositary (the “Depositary”). 

In accordance with Section 2.3(a) of the Deposit Agreement, the undersigned hereby requests the withdrawal of the entire amount of the
Deposit, $[            ], Account No. [            ]. 

The undersigned hereby directs the Depositary to pay the entire amount of the Deposit to Wilmington Trust, National Association, Account No.
[            ], ABA No. [            ], Account Name: United Airlines
2018-1 EETC, Reference: [            ] on [            ]. 

 

			
	 U.S. BANK NATIONAL ASSOCIATION,
 as
Escrow Agent

 
			
		
	By	 	  

 
			
		 	Name:
		 	Title:

 Dated: As of [                ]

 Exhibit B 

NOTICE OF PURCHASE WITHDRAWAL 
 Citibank, N.A.

 as Depositary, 
 480 Washington Blvd., 18th
Floor 
 Jersey City, NJ 07310 
 Attention: Agency &
Trust Payment Group 
 E-mail: cts.spag@citi.com 

Ladies and Gentlemen: 
 Reference is made to the
Deposit Agreement (Class A) dated as of February 14, 2018 (the “Deposit Agreement”) between U.S. Bank National Association, as Escrow Agent, and Citibank, N.A., as Depositary (the “Depositary”). 

In accordance with Section 2.3(a) of the Deposit Agreement, the undersigned hereby requests the withdrawal of the entire amount of the
Deposit, $[            ], Account No. [            ]. 

The undersigned hereby directs the Depositary to pay the entire amount of the Deposit to Wilmington Trust, National Association, Account No.
[            ], ABA No. [            ], Account Name: United Airlines
2018-1 EETC, Reference: [            ] on [            ]. 

 

			
	 U.S. BANK NATIONAL ASSOCIATION,
 as
Escrow Agent

 
			
		
	By	 	  

 
			
		 	Name:
		 	Title:

 Dated: As of
[                    ] 

 Exhibit C 

NOTICE OF PURCHASE WITHDRAWAL 
 Citibank, N.A.

 as Depositary, 
 480 Washington Blvd., 18th
Floor 
 Jersey City, NJ 07310Attention: 
 Agency &
Trust Payment Group 
 E-mail: cts.spag@citi.com 

Ladies and Gentlemen: 
 Reference is made to the
Deposit Agreement (Class B) dated as of May 23, 2018 (the “Deposit Agreement”) between U.S. Bank National Association, as Escrow Agent, and Citibank, N.A., as Depositary (the “Depositary”). 

In accordance with Section 2.3(a) of the Deposit Agreement, the undersigned hereby requests the withdrawal of the entire amount of the
Deposit, $[            ], Account No. [        ]. 

The undersigned hereby directs the Depositary to pay the entire amount of the Deposit to Wilmington Trust, National Association, Account No.
[            ], ABA No. [            ], Account Name: United Airlines
2018-1 EETC, Reference: [                ] on
[                ]. 
  

			
	 U.S. BANK NATIONAL ASSOCIATION,
 as
Escrow Agent

 
			
		
	By	 	  

 
			
		 	Name:
		 	Title:

 Dated: As of [                ]

 EXHIBIT C TO NOTE PURCHASE AGREEMENT 

 
 TRUST INDENTURE AND MORTGAGE
[        ] 
 Dated as of [        ] 

between 
 UNITED AIRLINES, INC.,

 Owner, 
 and 

WILMINGTON TRUST, NATIONAL ASSOCIATION, 

not in its individual capacity, 

except as expressly stated herein, 

but solely as Mortgagee, 

Mortgagee 
  

EQUIPMENT NOTES COVERING 
 ONE
BOEING [            ] AIRCRAFT 
 BEARING U.S. REGISTRATION MARK
N[        ] 
 AND MANUFACTURER’S SERIAL NO.
[            ] 
  

 TABLE OF CONTENTS 
  

					
	 	  	Page	 
	 GRANTING CLAUSE
	  	 	1	 
		
	 ARTICLE I DEFINITIONS
	  	 	4	 
		
	 ARTICLE II THE EQUIPMENT NOTES
	  	 	4	 
		
	 SECTION 2.01. Form of Equipment Notes
	  	 	4	 
	 SECTION 2.02. Issuance and Terms of Equipment Notes
	  	 	11	 
	 SECTION 2.03. [Intentionally Omitted]
	  	 	13	 
	 SECTION 2.04. Method of Payment
	  	 	13	 
	 SECTION 2.05. Application of Payments
	  	 	15	 
	 SECTION 2.06. Termination of Interest in Collateral
	  	 	16	 
	 SECTION 2.07. Registration Transfer and Exchange of Equipment Notes
	  	 	16	 
	 SECTION 2.08. Mutilated, Destroyed, Lost or Stolen Equipment Notes
	  	 	17	 
	 SECTION 2.09. Payment of Expenses on Transfer; Cancellation
	  	 	18	 
	 SECTION 2.10. Mandatory Redemptions of Equipment Notes
	  	 	18	 
	 SECTION 2.11. Voluntary Redemptions of Equipment Notes
	  	 	18	 
	 SECTION 2.12. Redemptions; Notice of Redemption
	  	 	19	 
	 SECTION 2.13. Subordination
	  	 	20	 
		
	 ARTICLE III RECEIPT, DISTRIBUTION AND APPLICATION OF PAYMENTS
	  	 	21	 
		
	 SECTION 3.01. Basic Distributions
	  	 	21	 
	 SECTION 3.02. Event of Loss; Replacement; Optional Redemption
	  	 	22	 
	 SECTION 3.03. Payments After Event of Default
	  	 	24	 
	 SECTION 3.04. Certain Payments
	  	 	27	 
	 SECTION 3.05. Other Payments
	  	 	27	 
	 SECTION 3.06. Cooperation
	  	 	27	 
	 SECTION 3.07. Securities Account
	  	 	27	 
		
	 ARTICLE IV COVENANTS OF THE OWNER
	  	 	28	 
		
	 SECTION 4.01. Liens
	  	 	28	 
	 SECTION 4.02. Possession, Operation and Use, Maintenance, Registration and Markings
	  	 	28	 
	 SECTION 4.03. Inspection
	  	 	33	 
	 SECTION 4.04. Replacement and Pooling of Parts, Alterations, Modifications and Additions;
Substitution Rights
	  	 	34	 
	 SECTION 4.05. Loss, Destruction or Requisition
	  	 	38	 
	 SECTION 4.06. Insurance
	  	 	42	 
	 SECTION 4.07. Merger of Owner
	  	 	42	 
		
	 ARTICLE V EVENTS OF DEFAULT; REMEDIES OF MORTGAGEE
	  	 	43	 
		
	 SECTION 5.01. Event of Default
	  	 	43	 
	 SECTION 5.02. Remedies
	  	 	45	 

 TABLE OF CONTENTS 

(continued) 
  

					
	 	  	Page	 
	 SECTION 5.03. Return of Aircraft, Etc.
	  	 	46	 
	 SECTION 5.04. Remedies Cumulative
	  	 	47	 
	 SECTION 5.05. Discontinuance of Proceedings
	  	 	47	 
	 SECTION 5.06. Waiver of Past Defaults
	  	 	48	 
	 SECTION 5.07. Appointment of Receiver
	  	 	48	 
	 SECTION 5.08. Mortgagee Authorized to Execute Bills of Sale, Etc.
	  	 	48	 
	 SECTION 5.09. Rights of Note Holders to Receive Payment
	  	 	48	 
		
	 ARTICLE VI DUTIES OF THE MORTGAGEE
	  	 	49	 
		
	 SECTION 6.01. Notice of Event of Default
	  	 	49	 
	 SECTION 6.02. Action Upon Instructions; Certain Rights and Limitations
	  	 	49	 
	 SECTION 6.03. Indemnification
	  	 	50	 
	 SECTION 6.04. No Duties Except as Specified in Trust Indenture or Instructions
	  	 	50	 
	 SECTION 6.05. No Action Except Under Trust Indenture or Instructions
	  	 	50	 
	 SECTION 6.06. Investment of Amounts Held by Mortgagee
	  	 	51	 
		
	 ARTICLE VII THE MORTGAGEE
	  	 	51	 
		
	 SECTION 7.01. Acceptance of Trusts and Duties
	  	 	51	 
	 SECTION 7.02. Absence of Duties
	  	 	51	 
	 SECTION 7.03. No Representations or Warranties as to Aircraft or Documents
	  	 	52	 
	 SECTION 7.04. No Segregation of Monies; No Interest
	  	 	52	 
	 SECTION 7.05. Reliance; Agreements; Advice of Counsel
	  	 	52	 
	 SECTION 7.06. Compensation
	  	 	53	 
	 SECTION 7.07. Instructions from Note Holders
	  	 	53	 
		
	 ARTICLE VIII INDEMNIFICATION
	  	 	53	 
		
	 SECTION 8.01. Scope of Indemnification
	  	 	53	 
		
	 ARTICLE IX SUCCESSOR AND SEPARATE TRUSTEES
	  	 	54	 
		
	 SECTION 9.01. Resignation of Mortgagee; Appointment of Successor
	  	 	54	 
	 SECTION 9.02. Appointment of Additional and Separate Trustees
	  	 	55	 
		
	 ARTICLE X SUPPLEMENTS AND AMENDMENTS TO THIS TRUST INDENTURE AND OTHER DOCUMENTS
	  	 	56	 
		
	 SECTION 10.01. Instructions of Majority; Limitations
	  	 	56	 
	 SECTION 10.02. Mortgagee Protected
	  	 	58	 
	 SECTION 10.03. Documents Mailed to Note Holders
	  	 	58	 
	 SECTION 10.04. No Request Necessary for Trust Indenture Supplement
	  	 	58	 

  
 ii 

 TABLE OF CONTENTS 

(continued) 
  

					
	 	  	Page	 
	 ARTICLE XI MISCELLANEOUS
	  	 	58	 
		
	 SECTION 11.01. Termination of Trust Indenture
	  	 	58	 
	 SECTION 11.02. No Legal Title to Collateral in Note Holders
	  	 	59	 
	 SECTION 11.03. Sale of Aircraft by Mortgagee Is Binding
	  	 	59	 
	 SECTION 11.04. Trust Indenture for Benefit of Owner, Mortgagee, Note Holders and the other
Indenture Indemnitees
	  	 	59	 
	 SECTION 11.05. Notices
	  	 	59	 
	 SECTION 11.06. Severability
	  	 	60	 
	 SECTION 11.07. No Oral Modification or Continuing Waivers
	  	 	60	 
	 SECTION 11.08. Successors and Assigns
	  	 	60	 
	 SECTION 11.09. Headings
	  	 	60	 
	 SECTION 11.10. Normal Commercial Relations
	  	 	60	 
	 SECTION 11.11. Governing Law; Counterpart Form
	  	 	61	 
	 SECTION 11.12. Voting By Note Holders
	  	 	61	 
	 SECTION 11.13. Bankruptcy
	  	 	61	 

  

			
	ANNEX A	  	Definitions
	ANNEX B	  	Insurance
	EXHIBIT A	  	Form of Trust Indenture and Mortgage Supplement
	SCHEDULE I	  	Equipment Notes Amortization and Interest Rates

  
 iii 

 TRUST INDENTURE AND MORTGAGE [        ] 

TRUST INDENTURE AND MORTGAGE [        ], dated as of
[        ] (this “Trust Indenture”), between UNITED AIRLINES, INC., a Delaware corporation (“Owner”), and WILMINGTON TRUST, NATIONAL ASSOCIATION, a national banking association, not
in its individual capacity, except as expressly stated herein, but solely as Mortgagee hereunder (together with its successors hereunder, the “Mortgagee”). 

W I T N E S S E T H 

WHEREAS, all capitalized terms used herein shall have the respective meanings set forth or referred to in Article I hereof; 

WHEREAS, the parties hereto desire by this Trust Indenture, among other things, (i) to provide for the issuance by the Owner of the
Series of Equipment Notes specified on Schedule I hereto, and the possible issuance of Additional Series, and (ii) to provide for the assignment, mortgage and pledge by the Owner to the Mortgagee, as part of the Collateral hereunder, among
other things, of all of the Owner’s right, title and interest in and to the Aircraft and, except as hereinafter expressly provided, all payments and other amounts received hereunder in accordance with the terms hereof, as security for, among
other things, the Owner’s obligations to the Note Holders and the Indenture Indemnitees; 
 WHEREAS, all things have been done to make
the Equipment Notes of the Series listed on Schedule I hereto, when executed by the Owner and authenticated and delivered by the Mortgagee hereunder, the valid, binding and enforceable obligations of the Owner; and 

WHEREAS, all things necessary to make this Trust Indenture the valid, binding and legal obligation of the Owner for the uses and purposes
herein set forth, in accordance with its terms, have been done and performed and have happened; 
 GRANTING CLAUSE 

NOW, THEREFORE, THIS TRUST INDENTURE AND MORTGAGE WITNESSETH, that, to secure the prompt payment of the Original Amount of, interest on,
Make-Whole Amount, if any, and all other amounts due with respect to, all Equipment Notes from time to time outstanding hereunder according to their tenor and effect and to secure the performance and observance by the Owner of all the agreements,
covenants and provisions contained herein and in the Participation Agreement and in the Equipment Notes and to secure the Related Secured Obligations and the performance and observance by the Owner of all agreements, covenants and provisions
contained in the Related Equipment Notes, for the benefit of the Note Holders and each of the Indenture Indemnitees, and in consideration of the premises and of the covenants herein contained, and of the acceptance of the Equipment Notes and the
Related Equipment Notes by the holders thereof, and for other good and valuable consideration the receipt and adequacy whereof are hereby acknowledged, the Owner has granted, bargained, sold, assigned, transferred, conveyed, mortgaged, pledged and
confirmed, and does hereby grant, bargain, sell, assign, transfer, convey, mortgage, pledge and confirm, unto the Mortgagee, its successors in trust and assigns, for the security and benefit of, the Note Holders and each of the

 
Indenture Indemnitees, a first priority security interest and, in the case of the Airframe and Engines, an International Interest in and mortgage lien on all right, title and interest of the
Owner in, to and under the following described property, rights and privileges, whether now or hereafter acquired (which, collectively, together with all property hereafter specifically subject to the Lien of this Trust Indenture by the terms hereof
or any supplement hereto, are included within, and are referred to as, the “Collateral”), to wit: 
 (1) The Airframe which is one
Boeing [            ] aircraft with the FAA Registration number of N[                ] and the
manufacturer’s serial number of [                ] and two Engines, each of which Engines is a
[                                         
   ] jet propulsion aircraft engine with at least 1750 lb. of thrust, with the manufacturer’s serial numbers of [            ] and
[            ] (such Airframe and Engines more particularly described in the Trust Indenture Supplement executed and delivered as provided herein) as the same is now and will
hereafter be constituted, whether now owned by the Owner or hereafter acquired, and in the case of such Engines, whether or not any such Engine shall be installed in or attached to the Airframe or any other airframe, together with (a) all Parts
of whatever nature, which are from time to time included within the definitions of “Airframe” or “Engines”, whether now owned or hereafter acquired, including all substitutions, renewals and replacements of and additions,
improvements, accessions and accumulations to the Airframe and Engines (other than additions, improvements, accessions and accumulations which constitute appliances, parts, instruments, appurtenances, accessories, furnishings or other equipment
excluded from the definition of Parts) and (b) all Aircraft Documents; 
 (2) The Purchase Agreement and the Bills of Sale to the extent
the same relate to continuing rights of the Owner in respect of any warranty, indemnity or agreement, express or implied, as to title, materials, workmanship, design or patent infringement or related matters with respect to the Airframe or the
Engines (reserving to the Owner, however, all of the Owner’s other rights and interest in and to the Purchase Agreement) together with all rights, powers, privileges, options and other benefits of the Owner thereunder (subject to such
reservation) with respect to the Airframe or the Engines, including, without limitation, the right to make all waivers and agreements, to give and receive all notices and other instruments or communications, to take such action upon the occurrence
of a default thereunder, including the commencement, conduct and consummation of legal, administrative or other proceedings, as shall be permitted thereby or by law, and to do any and all other things which the Owner is or may be entitled to do
thereunder (subject to such reservation), subject, with respect to the Purchase Agreement, to the terms and conditions of the Consent and Agreement and the Engine Consent and Agreement; 

(3) All proceeds with respect to the requisition of title to or use of the Aircraft or any Engine by any Government Entity or from the sale or
other disposition of the Aircraft, the Airframe, any Engine or other property described in any of these Granting Clauses by the Mortgagee pursuant to the terms of this Trust Indenture, and all insurance proceeds with respect to the Aircraft, the
Airframe, any Engine or any part thereof, but excluding any insurance maintained by the Owner and not required under Section 4.06; 

  
 2 

 (4) All rents, revenues and other proceeds collected by the Mortgagee pursuant to paragraph
(v) of clause “Third” of Section 3.03 and Section 5.03(b) and all monies and securities from time to time deposited or required to be deposited with the Mortgagee by or for the account of the Owner pursuant to any terms of
this Trust Indenture held or required to be held by the Mortgagee hereunder, including the Securities Account and all monies and securities deposited into the Securities Account; and 

(5) All proceeds of the foregoing. 

PROVIDED, HOWEVER, that notwithstanding any of the foregoing provisions, so long as no Event of Default shall have occurred and be continuing,
(a) the Mortgagee shall not take or cause to be taken any action contrary to the Owner’s right hereunder to quiet enjoyment of the Airframe and Engines, and to possess, use, retain and control the Airframe and Engines and all revenues,
income and profits derived therefrom, and (b) the Owner shall have the right, to the exclusion of the Mortgagee, with respect to the Indenture Agreements, to exercise in the Owner’s name all rights and powers of the Owner under the
Indenture Agreements (other than to amend, modify or waive any of the warranties or indemnities contained therein, except in the exercise of the Owner’s reasonable business judgment) and to retain any recovery or benefit resulting from the
enforcement of any warranty or indemnity under the Indenture Agreements; and provided further that, notwithstanding the occurrence or continuation of an Event of Default, the Mortgagee shall not enter into any amendment of any Indenture
Agreement which would increase the obligations of the Owner thereunder. 
 TO HAVE AND TO HOLD all and singular the aforesaid property unto
the Mortgagee, and its successors and assigns, in trust for the equal and proportionate benefit and security of the Note Holders and the Indenture Indemnitees, except as provided in Section 2.13 and Article III hereof, without any preference,
distinction or priority of any one Equipment Note over any other, or any Related Equipment Note over any other, by reason of priority of time of issue, sale, negotiation, date of maturity thereof or otherwise for any reason whatsoever, and for the
uses and purposes and in all cases and as to all property specified in clauses (1) through (5) inclusive above, subject to the terms and provisions set forth in this Trust Indenture. 

It is expressly agreed that anything herein contained to the contrary notwithstanding, the Owner shall remain liable under the Indenture
Agreements to perform all of the obligations assumed by it thereunder, except to the extent prohibited or excluded from doing so pursuant to the terms and provisions thereof, and the Mortgagee, the Note Holders and the Indenture Indemnitees shall
have no obligation or liability under the Indenture Agreements by reason of or arising out of the assignment hereunder, nor shall the Mortgagee, the Note Holders or the Indenture Indemnitees be required or obligated in any manner to perform or
fulfill any obligations of the Owner under or pursuant to the Indenture Agreements, or, except as herein expressly provided, to make any payment, or to make any inquiry as to the nature or sufficiency of any payment received by it, or present or
file any claim, or take any action to collect or enforce the payment of any amounts which may have been assigned to it or to which it may be entitled at any time or times. 

The Owner does hereby constitute the Mortgagee the true and lawful attorney of the Owner, irrevocably, granted for good and valuable
consideration and coupled with an interest and with full power of substitution, and with full power (in the name of the Owner or otherwise) to ask for, require, demand, receive, compound and give acquittance for any and all monies and

  
 3 

 
claims for monies (in each case including insurance and requisition proceeds) due and to become due under or arising out of the Indenture Agreements, and all other property which now or hereafter
constitutes part of the Collateral, to endorse any checks or other instruments or orders in connection therewith and to file any claims or to take any action or to institute any proceedings which the Mortgagee may deem to be necessary or advisable
in the premises; provided that the Mortgagee shall not exercise any such rights except upon the occurrence and during the continuance of an Event of Default hereunder. 

The Owner agrees that at any time and from time to time, upon the written request of the Mortgagee, the Owner will promptly and duly execute
and deliver or cause to be duly executed and delivered any and all such further instruments and documents (including without limitation UCC continuation statements) as the Mortgagee may reasonably deem necessary to perfect, preserve or protect the
mortgage, security interests, International Interests and assignments created or intended to be created hereby or to obtain for the Mortgagee the full benefits of the assignment hereunder and of the rights and powers herein granted. 

IT IS HEREBY COVENANTED AND AGREED by and between the parties hereto as follows: 

ARTICLE I 
 DEFINITIONS

 Capitalized terms used but not defined herein shall have the respective meanings set forth or incorporated by reference, and shall be
construed in the manner described, in Annex A hereto. 
 ARTICLE II 

THE EQUIPMENT NOTES 

SECTION 2.01. Form of Equipment Notes 

The Equipment Notes shall be substantially in the form set forth below: 

THIS EQUIPMENT NOTE HAS NOT BEEN REGISTERED PURSUANT TO THE SECURITIES ACT OF 1933, AS AMENDED (THE “ACT”), OR PURSUANT TO THE
SECURITIES LAWS OF ANY STATE. ACCORDINGLY, THIS EQUIPMENT NOTE MAY NOT BE SOLD UNLESS EITHER REGISTERED UNDER THE ACT AND SUCH APPLICABLE STATE LAWS OR AN EXEMPTION FROM SUCH REGISTRATIONS IS AVAILABLE. 

  
 4 

 UNITED AIRLINES, INC. 

SERIES [        ] EQUIPMENT NOTE DUE
[            ] ISSUED IN CONNECTION WITH THE BOEING MODEL [            ] AIRCRAFT BEARING UNITED STATES
REGISTRATION NUMBER N[            ] 
 No.
____                                         
                                         
                                         
             Date: [            ,     ] 

 
 INTEREST
RATE                                        
                                         
                                         
              MATURITY DATE 

[                         
   ]                                      
                                         
                                         
                [                        ]

 UNITED AIRLINES, INC., a Delaware corporation (“Owner”), hereby promises to pay to
                            , or the registered assignee thereof, the principal sum of
$                         (the “Original Amount”), together with interest on the amount of the Original Amount
remaining unpaid from time to time (calculated on the basis of a year of 360 days comprised of twelve 30-day months) from the date hereof until paid in full at a rate per annum equal to the Debt Rate. The
Original Amount of this Equipment Note shall be due and payable in installments on the dates set forth in Schedule I hereto equal to the corresponding percentage of the Original Amount of this Equipment Note set forth in Schedule I hereto. Accrued
but unpaid interest shall be due and payable in semi-annual installments commencing on [                    ]1 and thereafter on [March 1 and September 1]2 of each year, to and including
[                            ]. Notwithstanding the foregoing, the final payment made on this
Equipment Note shall be in an amount sufficient to discharge in full the unpaid Original Amount and all accrued and unpaid interest on, and any other amounts due under, this Equipment Note. Notwithstanding anything to the contrary contained herein,
if any date on which a payment under this Equipment Note becomes due and payable is not a Business Day, then such payment shall not be made on such scheduled date but shall be made on the next succeeding Business Day and if such payment is made on
such next succeeding Business Day, no interest shall accrue on the amount of such payment during such extension. 
 For purposes hereof, the
term “Trust Indenture” means the Trust Indenture and Mortgage [            ] dated as of [            ],
between the Owner and Wilmington Trust, National Association (the “Mortgagee”), as the same may be amended or supplemented from time to time. All other capitalized terms used in this Equipment Note and not defined herein shall have the
respective meanings assigned in the Trust Indenture. 
 This Equipment Note shall bear interest, payable on demand, at the Payment Due Rate
(calculated on the basis of a year of 360 days comprised of twelve 30-day months) on any overdue Original Amount, any overdue Make-Whole Amount, if any, and (to the extent permitted by applicable Law) any
overdue interest and any other amounts payable hereunder which are overdue, in each case for the period the same is overdue. Amounts shall be overdue if not paid when due (whether at stated maturity, by acceleration or otherwise). 

 

	1. 	Insert first March 1 or September 1 after the Closing Date, excluding March 1, 2018. 

	2. 	 Correct order, if necessary. 

  
 5 

 There shall be maintained an Equipment Note Register for the purpose of registering transfers and
exchanges of Equipment Notes at the Corporate Trust Office of the Mortgagee or at the office of any successor in the manner provided in Section 2.07 of the Trust Indenture. 

The Original Amount and interest and other amounts due hereunder shall be payable in Dollars in immediately available funds at the Corporate
Trust Office of the Mortgagee, or as otherwise provided in the Trust Indenture. Each such payment shall be made on the date such payment is due and without any presentment or surrender of this Equipment Note, except that in the case of any final
payment with respect to this Equipment Note, the Equipment Note shall be surrendered promptly thereafter to the Mortgagee for cancellation. 

The holder hereof, by its acceptance of this Equipment Note, agrees that, except as provided in the Trust Indenture, each payment of the
Original Amount, Make-Whole Amount, if any, and interest received by it hereunder shall be applied, first, to the payment of Make-Whole Amount, if any, and any other amount (other than as covered by any of the following clauses) due hereunder
or under the Trust Indenture, second, to the payment of accrued interest on this Equipment Note (as well as any interest on any overdue Original Amount, any overdue Make-Whole Amount, if any, or, to the extent permitted by Law, any overdue
interest and other amounts hereunder) to the date of such payment, third, to the payment of the Original Amount of this Equipment Note then due, and fourth, the balance, if any, remaining thereafter, to the payment of installments of
the Original Amount of this Equipment Note remaining unpaid in the inverse order of their maturity. 
 This Equipment Note is one of the
Equipment Notes referred to in the Trust Indenture which have been or are to be issued by the Owner pursuant to the terms of the Trust Indenture. The Collateral is held by the Mortgagee as security, in part, for the Equipment Notes. The provisions
of this Equipment Note are subject to the Trust Indenture and the Related Indentures. Reference is hereby made to the Trust Indenture and the Related Indentures for a complete statement of the rights and obligations of the holder of, and the nature
and extent of the security for, this Equipment Note (including as a “Related Equipment Note” under each of the Related Indentures) and the rights and obligations of the holders of, and the nature and extent of the security for, any other
Equipment Notes executed and delivered under the Trust Indenture, as well as for a statement of the terms and conditions of the Trust created by the Trust Indenture, to all of which terms and conditions in the Trust Indenture each holder hereof
agrees by its acceptance of this Equipment Note. 
 As provided in the Trust Indenture and subject to certain limitations therein set forth,
this Equipment Note is exchangeable for a like aggregate Original Amount of Equipment Notes of different authorized denominations, as requested by the holder surrendering the same. 

Prior to due presentment for registration of transfer of this Equipment Note, the Owner and the Mortgagee shall treat the person in whose name
this Equipment Note is registered as the owner hereof for all purposes, whether or not this Equipment Note be overdue, and neither the Owner nor the Mortgagee shall be affected by notice to the contrary. 

  
 6 

 This Equipment Note is subject to redemption as provided in Sections 2.10, 2.11 and 2.12 of the
Trust Indenture but not otherwise. In addition, this Equipment Note may be accelerated as provided in Section 5.02 of the Trust Indenture. 

This Equipment Note is subject to certain restrictions set forth in Sections 4.1(a)(i) and 4.1(a)(iii) of the Intercreditor Agreement, as
further specified in Section 2.07 of the Trust Indenture, to all of which terms and conditions in the Intercreditor Agreement each holder hereof agrees by its acceptance of this Equipment Note. 

[The indebtedness evidenced by this Equipment Note is, to the extent and in the manner provided in the Trust Indenture, subordinate and
subject in right of payment to the prior payment in full of the Secured Obligations (as defined in the Trust Indenture) in respect of [Series AA Equipment Notes and Related Series AA Equipment
Notes]3 [Series AA Equipment Notes, Series A Equipment Notes, Related Series AA Equipment Notes and Related Series A Equipment Notes]4 [Series
AA Equipment Notes, Series A Equipment Notes, Series B Equipment Notes, Related Series AA Equipment Notes, Related Series A Equipment Notes and Related Series B Equipment Notes]5, and certain
other Secured Obligations, and this Equipment Note is issued subject to such provisions. The Note Holder of this Equipment Note, by accepting the same, (a) agrees to and shall be bound by such provisions, (b) authorizes and directs the
Mortgagee on his behalf to take such action as may be necessary or appropriate to effectuate the subordination as provided in the Trust Indenture and (c) appoints the Mortgagee his
attorney-in-fact for such purpose.]6 

Unless the certificate of authentication hereon has been executed by or on behalf of the Mortgagee by manual signature, this Equipment Note
shall not be entitled to any benefit under the Trust Indenture or be valid or obligatory for any purpose. 
  

	3. 	To be inserted in the case of a Series A Equipment Note. 

	4. 	To be inserted in the case of a Series B Equipment Note. 

	5. 	To be inserted in the case of an Additional Series Equipment Note. 

	6. 	To be inserted for each Equipment Note other than any Series AA Equipment Note. 

  
 7 

 THIS EQUIPMENT NOTE SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE
STATE OF NEW YORK. 
 *    *    * 

  
 8 

 IN WITNESS WHEREOF, the Owner has caused this Equipment Note to be executed in its corporate name
by its officer thereunto duly authorized on the date hereof. 
  

			
	UNITED AIRLINES, INC.
		
	By:	 	  

		 	Name:
		 	Title:

  
 9 

 MORTGAGEE’S CERTIFICATE OF AUTHENTICATION 

This is one of the Equipment Notes referred to in the within-mentioned Trust Indenture. 

 

			
	WILMINGTON TRUST, NATIONAL         ASSOCIATION, as Mortgagee

 
			
		
	By:	 	 _

 
			
		 	Name:
		 	Title:

 SCHEDULE I 

EQUIPMENT NOTE AMORTIZATION 
 Payment
Date                                        
             Percentage of Original Amount to Be Paid 
 [SEE SCHEDULE I
TO TRUST INDENTURE 
 WHICH IS INSERTED UPON ISSUANCE] 

*    *    * 

  
 10 

 SECTION 2.02. Issuance and Terms of Equipment Notes 

The Equipment Notes (other than the Additional Series Equipment Notes) shall be dated the Closing Date, shall be issued in three separate
series consisting of Series AA, Series A and Series B and in the maturities and principal amounts and shall bear interest as specified in Schedule I hereto. On the Closing Date, each Series specified in Schedule I shall be issued to the
Subordination Agent on behalf of the Applicable Pass Through Trustee under the Applicable Pass Through Trust Agreement. In addition to the foregoing, Owner shall have the option to issue one or more separate series of Additional
Series Equipment Notes at any time and from time to time at or after the Issuance Date, subject to the terms of Section 4(a)(vi) of the Note Purchase Agreement and Section 9.1(d) of the Intercreditor Agreement. If more than one series
of Additional Series Equipment Notes are so issued, each such series shall have a different designation such as, for example, “Series C” and “Series D”, shall be dated the date of original issuance thereof and shall have such
maturities, principal amounts and interest rates as specified in an amendment to this Trust Indenture. The Equipment Notes shall be issued in registered form only. The Equipment Notes shall be issued in denominations of $1,000 and integral multiples
thereof, except that one Equipment Note of each Series may be in an amount that is not an integral multiple of $1,000. Without limitation of the foregoing, new Series A Equipment Notes or new Series B Equipment Notes may be issued pursuant to the
provisions of Section 2.11(b) or Section 2.11(c). 
 Each Equipment Note shall bear interest at the applicable Debt Rate
(calculated on the basis of a year of 360 days comprised of twelve 30-day months) on the unpaid Original Amount thereof from time to time outstanding. Accrued interest shall be payable in arrears on
[                    ], 20[        ]7, and
on each [March 1 and September 1]8 thereafter until maturity. The Original Amount of each Equipment Note shall be payable on the dates and in the installments equal to the corresponding percentage
of the Original Amount as set forth in Schedule I hereto for the applicable Series (as amended, in the case of any Additional Series, at the time of original issuance of such Additional Series) which shall be attached as Schedule I to such Equipment
Notes. Notwithstanding the foregoing, the final payment made under each Equipment Note shall be in an amount sufficient to discharge in full the unpaid Original Amount and all accrued and unpaid interest on, and any other amounts due under, such
Equipment Note. Each Equipment Note shall bear interest, payable on demand, at the Payment Due Rate (calculated on the basis of a year of 360 days comprised of twelve 30-day months) on any part of the Original
Amount, Make-Whole Amount, if any, and, to the extent permitted by applicable Law, interest and any other amounts payable thereunder not paid when due for any period during which the same shall be overdue, in each case for the period the same is
overdue. Amounts under any Equipment Note shall be overdue if not paid when due (whether at stated maturity, by acceleration or otherwise). Notwithstanding anything to the contrary contained herein, if any date on which a payment under any Equipment
Note becomes due and payable is not a Business Day then such payment shall not be made on such scheduled date but shall be made on the next succeeding Business Day and if such payment is made on such next succeeding Business Day, no interest shall
accrue on the amount of such payment during such extension. 
  

	7. 	Insert first March 1 or September 1 after the Closing Date, excluding March 1, 2018. 

	8. 	 Correct order, if necessary. 

  
 11 

 The Owner agrees to pay to the Mortgagee for distribution in accordance with Section 3.04
hereof: (a)(i) to the extent not payable (whether or not in fact paid) under Section 6(a) of the Note Purchase Agreement, an amount equal to the fees payable to the Liquidity Provider under Section 2.03 of each Liquidity Facility and the
related Fee Letter (as defined in the Intercreditor Agreement) multiplied by a fraction the numerator of which shall be the then outstanding aggregate principal amount of the Series AA Equipment Notes, Series A Equipment Notes and Series B
Equipment Notes and the denominator of which shall be the then outstanding aggregate principal amount of all “Series AA Equipment Notes”, “Series A Equipment Notes” and “Series B Equipment Notes” (each as
defined in the Note Purchase Agreement); (ii) (x) the amount equal to interest on any Downgrade Advance (other than any Applied Downgrade Advance) payable under Section 3.07 of each Liquidity Facility minus Investment Earnings from such
Downgrade Advance multiplied by (y) the fraction specified in the foregoing clause (i); (iii) (x) the amount equal to interest on any Non-Extension Advance (other than any Applied Non-Extension Advance) payable under Section 3.07 of each Liquidity Facility minus Investment Earnings from such Non-Extension Advance multiplied by (y) the fraction
specified in the foregoing clause (i); (iv) (x) the amount equal to interest on any Special Termination Advance (other than any Applied Special Termination Advance) payable under Section 3.07 of each Liquidity Facility minus Investment
Earnings from such Special Termination Advance multiplied by (y) the fraction specified in the foregoing clause (i); (v) if any payment default shall have occurred and be continuing with respect to interest on any “Series AA Equipment
Notes”, “Series A Equipment Notes” or “Series B Equipment Notes” (each as defined in the Note Purchase Agreement), (x) the excess, if any, of (1) an amount equal to interest on any Unpaid Advance, Applied
Downgrade Advance, Applied Non-Extension Advance or Applied Special Termination Advance payable under Section 3.07 of each Liquidity Facility over (2) the sum of Investment Earnings from any Final
Advance plus any amount of interest at the Payment Due Rate actually payable (whether or not in fact paid) by Owner on the overdue scheduled interest on the “Equipment Notes” (as defined in the Note Purchase Agreement) in respect of which
such Unpaid Advance, Applied Downgrade Advance, Applied Non-Extension Advance or Applied Special Termination Advance was made by the Liquidity Provider multiplied by (y) a fraction the numerator of which
shall be the then aggregate overdue amounts of interest on the Series AA Equipment Notes, Series A Equipment Notes and Series B Equipment Notes (other than interest becoming due and payable solely as a result of acceleration of any such
Equipment Notes) and the denominator of which shall be the then aggregate overdue amounts of interest on all “Series AA Equipment Notes”, “Series A Equipment Notes” and “Series B Equipment Notes” (each as
defined in the Note Purchase Agreement) (other than interest becoming due and payable solely as a result of acceleration of any such “Equipment Notes”); and (vi) any other amounts owed to the Liquidity Provider by the Subordination
Agent as borrower under each Liquidity Facility other than amounts due as repayment of advances thereunder or as interest on such advances, except to the extent payable pursuant to clause (ii), (iii), (iv) or (v) above, multiplied by the
fraction specified in the foregoing clause (i), (b) Owner’s pro rata share of all compensation and reimbursement of expenses, disbursements and advances payable by Owner under the Pass Through Trust Agreements, (c) Owner’s pro rata
share of all compensation and reimbursement of expenses and disbursements payable to the 

  
 12 

 
Subordination Agent under the Intercreditor Agreement except with respect to any income or franchise taxes incurred by the Subordination Agent in connection with the transactions contemplated by
the Intercreditor Agreement and (d) in the event Owner requests any amendment to any Operative Agreement or Pass Through Agreement, Owner’s pro rata share of all reasonable fees and expenses (including, without limitation, fees and
disbursements of counsel) of the Escrow Agents and the Paying Agents in connection therewith payable by the Pass Through Trustees under the Escrow Agreements. As used herein, “Owner’s pro rata share” means as of any time a fraction,
the numerator of which is the principal balance then outstanding of Equipment Notes and the denominator of which is the aggregate principal balance then outstanding of all “Equipment Notes” (as each such term is defined in each of the
Operative Indentures). For purposes of this paragraph, the terms “Applied Downgrade Advance”, “Applied Non-Extension Advance”, “Applied Special Termination Advance”, “Cash
Collateral Account”, “Downgrade Advance”, “Final Advance”, “Investment Earnings”, “Non-Extension Advance”, “Special Termination Advance” and “Unpaid
Advance” shall have the meanings specified in each Liquidity Facility. 
 The Equipment Notes shall be executed on behalf of the Owner
by one of its authorized officers. Equipment Notes bearing the signatures of individuals who were at any time the proper officers of the Owner shall bind the Owner, notwithstanding that such individuals or any of them have ceased to hold such
offices prior to the authentication and delivery of such Equipment Notes or did not hold such offices at the respective dates of such Equipment Notes. The Owner may from time to time execute and deliver Equipment Notes with respect to the Aircraft
to the Mortgagee for authentication upon original issue and such Equipment Notes shall thereupon be authenticated and delivered by the Mortgagee upon the written request of the Owner signed by an authorized officer of the Owner. No Equipment Note
shall be secured by or entitled to any benefit under this Trust Indenture or be valid or obligatory for any purposes, unless there appears on such Equipment Note a certificate of authentication in the form provided for herein executed by the
Mortgagee by the manual signature of one of its authorized officers and such certificate upon any Equipment Notes be conclusive evidence, and the only evidence, that such Equipment Note has been duly authenticated and delivered hereunder. 

The aggregate Original Amount of any Series of Equipment Notes issued hereunder shall not exceed the amount set forth as the maximum therefor
on Schedule I hereto (as amended, in the case of any Additional Series, at the time of original issuance of such Additional Series). 

SECTION 2.03. [Intentionally Omitted] 

SECTION 2.04. Method of Payment 

(a) The Original Amount of, interest on, Make-Whole Amount, if any, and other amounts due under each Equipment Note or hereunder will be
payable in Dollars by wire transfer of immediately available funds not later than 12:30 PM, New York time, on the due date of payment to the Mortgagee at the Corporate Trust Office for distribution among the Note Holders in the manner provided
herein, and payment of such amount by the Owner to the Mortgagee shall be deemed to satisfy the Owner’s obligation to make such payment. The Owner shall not have any responsibility for the distribution of such payment to any Note Holder.

  
 13 

 
Notwithstanding the foregoing or any provision in any Equipment Note to the contrary, the Mortgagee will use reasonable efforts to pay or cause to be paid, if so directed in writing by any Note
Holder (with a copy to the Owner), all amounts paid by the Owner hereunder and under such holder’s Equipment Note or Equipment Notes to such holder or a nominee therefor (including all amounts distributed pursuant to Article III of this Trust
Indenture) by transferring, or causing to be transferred, by wire transfer of immediately available funds in Dollars, prior to 2:00 p.m., New York City time, on the due date of payment, to an account maintained by such holder with a bank located in
the continental United States the amount to be distributed to such holder, for credit to the account of such holder maintained at such bank. If the Mortgagee shall fail to make any such payment as provided in the immediately foregoing sentence after
its receipt of funds at the place and prior to the time specified above, the Mortgagee, in its individual capacity and not as trustee, agrees to compensate such holders for loss of use of funds at Debt Rate until such payment is made and the
Mortgagee shall be entitled to any interest earned on such funds until such payment is made. Any payment made hereunder shall be made without any presentment or surrender of any Equipment Note, except that, in the case of the final payment in
respect of any Equipment Note, such Equipment Note shall be surrendered to the Mortgagee for cancellation promptly after such payment. Notwithstanding any other provision of this Trust Indenture to the contrary, the Mortgagee shall not be required
to make, or cause to be made, wire transfers as aforesaid prior to the first Business Day on which it is practicable for the Mortgagee to do so in view of the time of day when the funds to be so transferred were received by it if such funds were
received after 12:30 PM, New York time, at the place of payment. Prior to the due presentment for registration of transfer of any Equipment Note, the Owner and the Mortgagee shall deem and treat the Person in whose name any Equipment Note is
registered on the Equipment Note Register as the absolute owner and holder of such Equipment Note for the purpose of receiving payment of all amounts payable with respect to such Equipment Note and for all other purposes, and none of the Owner or
the Mortgagee shall be affected by any notice to the contrary. So long as any signatory to the Participation Agreement or nominee thereof shall be a registered Note Holder, all payments to it shall be made to the account of such Note Holder
specified in Schedule 1 thereto and otherwise in the manner provided in or pursuant to the Participation Agreement unless it shall have specified some other account or manner of payment by notice to the Mortgagee consistent with this
Section 2.04. 
 (b) The Mortgagee, as agent for the Owner, shall exclude and withhold at the appropriate rate from each payment of
Original Amount of, interest on, Make-Whole Amount, if any, and other amounts due hereunder or under each Equipment Note (and such exclusion and withholding shall constitute payment in respect of such Equipment Note) any and all United States
withholding taxes, including, without limitation, any such withholding taxes imposed under FATCA applicable thereto as required by Law. The Mortgagee agrees to act as such withholding agent and, in connection therewith, whenever any present or
future United States taxes or similar charges are required to be withheld with respect to any amounts payable hereunder or in respect of the Equipment Notes, to withhold such amounts and timely pay the same to the appropriate authority in the name
of and on behalf of the Note Holders, that it will file any necessary United States withholding tax returns or statements when due, and that as promptly as possible after the payment thereof it will deliver to each Note Holder (with a copy to the
Owner) appropriate receipts showing the payment thereof, together with such additional documentary evidence as any such Note Holder may reasonably request from time to time. 

  
 14 

 If a Note Holder which is a Non-U.S. Person has furnished
to the Mortgagee a properly completed, accurate and currently effective U.S. Internal Revenue Service Form W-8BEN or W-8ECI (or such successor form or forms as may be
required by the United States Treasury Department) during the calendar year in which the payment hereunder or under the Equipment Note(s) held by such holder is made (but prior to the making of such payment), or in either of the two preceding
calendar years, and has not notified the Mortgagee of the withdrawal or inaccuracy of such form prior to the date of such payment (and the Mortgagee has no reason to believe that any information set forth in such form is inaccurate), the Mortgagee
shall withhold only the amount, if any, required by Law (after taking into account any applicable exemptions properly claimed by the Note Holder) to be withheld from payments hereunder or under the Equipment Notes held by such holder in respect of
United States federal income tax, including any amounts required to be withheld under FATCA. If a Note Holder (x) which is a Non-U.S. Person has furnished to the Mortgagee a properly completed, accurate
and currently effective U.S. Internal Revenue Service Form W-8ECI in duplicate (or such successor certificate, form or forms as may be required by the United States Treasury Department as necessary in order to
properly avoid withholding of United States federal income tax), for each calendar year in which a payment is made (but prior to the making of any payment for such year), and has not notified the Mortgagee of the withdrawal or inaccuracy of such
certificate or form prior to the date of such payment (and the Mortgagee has no reason to believe that any information set forth in such form is inaccurate) or (y) which is a U.S. Person has furnished to the Mortgagee a properly completed,
accurate and currently effective U.S. Internal Revenue Service Form W-9, if applicable, prior to a payment hereunder or under the Equipment Notes held by such holder, no amount shall be withheld from payments
in respect of United States federal income tax. If any Note Holder has notified the Mortgagee that any of the foregoing forms or certificates is withdrawn or inaccurate, or if such holder has not filed a form claiming an exemption from United States
withholding tax or if the Code or the regulations thereunder or the administrative interpretation thereof is at any time after the date hereof amended to require such withholding of United States federal income taxes from payments under the
Equipment Notes held by such holder, the Mortgagee agrees to withhold from each payment due to the relevant Note Holder withholding taxes at the appropriate rate under Law and will, on a timely basis as more fully provided above, deposit such
amounts with an authorized depository and make such returns, statements, receipts and other documentary evidence in connection therewith as required by Law. 

Owner shall not have any liability for the failure of the Mortgagee to withhold taxes in the manner provided for herein or for any false,
inaccurate or untrue evidence provided by any Note Holder hereunder. 
 SECTION 2.05. Application of Payments 

In the case of each Equipment Note, each payment of Original Amount, Make-Whole Amount, if any, and interest due thereon shall be applied: 

First: to the payment of Make-Whole Amount, if any, with respect to such Equipment Note and any other amount (other than as
covered by any of the following clauses) due hereunder or under such Equipment Note; 

  
 15 

 Second: to the payment of accrued interest on such Equipment Note (as well as any
interest on any overdue Original Amount, any overdue Make-Whole Amount, if any, and to the extent permitted by Law, any overdue interest and any other overdue amounts thereunder) to the date of such payment; 

Third: to the payment of the Original Amount of such Equipment Note (or a portion thereof) then due thereunder; and 

Fourth: the balance, if any, remaining thereafter, to the payment of the Original Amount of such Equipment Note remaining
unpaid (provided that such Equipment Note shall not be subject to redemption except as provided in Sections 2.10, 2.11 and 2.12 hereof). 
 The amounts paid
pursuant to clause “Fourth” above shall be applied to the installments of Original Amount of such Equipment Note in the inverse order of their scheduled maturity. 

SECTION 2.06. Termination of Interest in Collateral 

No Note Holder nor any other Indenture Indemnitee shall, as such, have any further interest in, or other right with respect to, the Collateral
when and if the Original Amount of, Make-Whole Amount, if any, and interest on and other amounts due under all Equipment Notes held by such Note Holder and all other sums then due and payable to such Note Holder, such Indenture Indemnitee or the
Mortgagee hereunder (including, without limitation, under the third paragraph of Section 2.02 hereof) and under the other Operative Agreements by the Owner and all Related Secured Obligations (collectively, the “Secured Obligations”)
shall have been paid in full. 
 SECTION 2.07. Registration Transfer and Exchange of Equipment Notes 

The Mortgagee shall keep a register (the “Equipment Note Register”) in which the Mortgagee shall provide for the registration of
Equipment Notes and the registration of transfers of Equipment Notes. No such transfer shall be given effect unless and until registration hereunder shall have occurred. The Equipment Note Register shall be kept at the Corporate Trust Office of the
Mortgagee. The Mortgagee is hereby appointed “Equipment Note Registrar” for the purpose of registering Equipment Notes and transfers of Equipment Notes as herein provided. A holder of any Equipment Note intending to exchange such Equipment
Note shall surrender such Equipment Note to the Mortgagee at the Corporate Trust Office, together with a written request from the registered holder thereof for the issuance of a new Equipment Note, specifying, in the case of a surrender for
transfer, the name and address of the new holder or holders. Upon surrender for registration of transfer of any Equipment Note, the Owner shall execute, and the Mortgagee shall authenticate and deliver, in the name of the designated transferee or
transferees, one or more new Equipment Notes of a like aggregate Original Amount and of the same Series. At the option of the Note Holder, Equipment Notes may be exchanged for other Equipment Notes of any authorized denominations of a like aggregate
Original Amount, upon surrender of the Equipment Notes to be exchanged to the Mortgagee at the Corporate Trust Office. Whenever any Equipment Notes are so surrendered for exchange, the Owner shall execute, and the Mortgagee shall authenticate and
deliver, the Equipment Notes 

  
 16 

 
which the Note Holder making the exchange is entitled to receive. All Equipment Notes issued upon any registration of transfer or exchange of Equipment Notes (whether under this Section 2.07
or under Section 2.08 hereof or otherwise under this Trust Indenture) shall be the valid obligations of the Owner evidencing the same respective obligations, and entitled to the same security and benefits under this Trust Indenture, as the
Equipment Notes surrendered upon such registration of transfer or exchange. Every Equipment Note presented or surrendered for registration of transfer, shall (if so required by the Mortgagee) be duly endorsed, or be accompanied by a written
instrument of transfer in form satisfactory to the Mortgagee duly executed by the Note Holder or such holder’s attorney duly authorized in writing, and the Mortgagee shall require evidence satisfactory to it as to the compliance of any such
transfer with the Securities Act, and the securities Laws of any applicable state. The Mortgagee shall make a notation on each new Equipment Note of the amount of all payments of Original Amount previously made on the old Equipment Note or Equipment
Notes with respect to which such new Equipment Note is issued and the date to which interest on such old Equipment Note or Equipment Notes has been paid. Interest shall be deemed to have been paid on such new Equipment Note to the date on which
interest shall have been paid on such old Equipment Note, and all payments of the Original Amount marked on such new Equipment Note, as provided above, shall be deemed to have been made thereon. The Owner shall not be required to exchange any
surrendered Equipment Notes as provided above during the ten-day period preceding the due date of any payment on such Equipment Note. The Owner shall in all cases deem the Person in whose name any Equipment
Note shall have been issued and registered as the absolute owner and holder of such Equipment Note for the purpose of receiving payment of all amounts payable by the Owner with respect to such Equipment Note and for all purposes until a notice
stating otherwise is received from the Mortgagee and such change is reflected on the Equipment Note Register. The Mortgagee will promptly notify the Owner of each registration of a transfer of an Equipment Note. Any such transferee of an Equipment
Note, by its acceptance of an Equipment Note, (i) agrees to the provisions of this Trust Indenture and the Participation Agreement applicable to Note Holders, including Sections 6.3, 6.4 and 9.1 thereof, and shall be deemed to have covenanted
to the parties to the Participation Agreement as to the matters covenanted by the original Note Holder in the Participation Agreement and (ii) agrees to the restrictions set forth in Sections 4.1(a)(i) and 4.1(a)(iii) of the Intercreditor
Agreement, and shall be deemed to have covenanted to the parties to the Intercreditor Agreement not to give any direction, or otherwise authorize, the Mortgagee to take any action that would violate Sections 4.1(a)(i) or 4.1(a)(iii) of the
Intercreditor Agreement. Subject to compliance by the Note Holder and its transferee (if any) of the requirements set forth in this Section 2.07, Mortgagee and Owner shall use all reasonable efforts to issue new Equipment Notes upon transfer or
exchange within 10 Business Days of the date an Equipment Note is surrendered for transfer or exchange. 
 SECTION 2.08. Mutilated,
Destroyed, Lost or Stolen Equipment Notes 
 If any Equipment Note shall become mutilated, destroyed, lost or stolen, the Owner shall,
upon the written request of the holder of such Equipment Note, execute and the Mortgagee shall authenticate and deliver in replacement thereof a new Equipment Note, payable in the same Original Amount dated the same date and captioned as issued in
connection with the Aircraft. If the Equipment Note being replaced has become mutilated, such Equipment Note shall be surrendered to the Mortgagee and a photocopy thereof shall be furnished to the Owner. If the Equipment Note being replaced has been
destroyed, lost or stolen, the holder of such 

  
 17 

 
Equipment Note shall furnish to the Owner and the Mortgagee such security or indemnity as may be required by them to save the Owner and the Mortgagee harmless and evidence satisfactory to the
Owner and the Mortgagee of the destruction, loss or theft of such Equipment Note and of the ownership thereof. If a “qualified institutional buyer” of the type referred to in paragraph (a)(1)(i)(A), (B), (D) or (E) of Rule 144A under
the Securities Act (a “QIB”) is the holder of any such destroyed, lost or stolen Equipment Note, then the written indemnity of such QIB, signed by an authorized officer thereof, in favor of, delivered to and in form reasonably satisfactory
Owner shall be accepted as satisfactory indemnity and security and no further indemnity or security shall be required as a condition to the execution and delivery of such new Equipment Note. Subject to compliance by the Note Holder with the
requirements set forth in this Section 2.08, Mortgagee and Owner shall use all reasonable efforts to issue new Equipment Notes within 10 Business Days of the date of the written request therefor from the Note Holder. 

SECTION 2.09. Payment of Expenses on Transfer; Cancellation 

(a) No service charge shall be made to a Note Holder for any registration of transfer or exchange of Equipment Notes, but the Mortgagee, as
Equipment Note Registrar, may require payment of a sum sufficient to cover any tax or other governmental charge that may be imposed in connection with any registration of transfer or exchange of Equipment Notes. 

(b) The Mortgagee shall cancel all Equipment Notes surrendered for replacement, redemption, transfer, exchange, payment or cancellation and
shall destroy the canceled Equipment Notes. 
 SECTION 2.10. Mandatory Redemptions of Equipment Notes 

On the date on which the Owner is required pursuant to Section 4.05 hereof to make payment for an Event of Loss with respect to the
Airframe, all of the Equipment Notes shall be redeemed in whole at a redemption price equal to 100% of the unpaid Original Amount thereof, together with all accrued interest thereon to the date of redemption and all other Secured Obligations (other
than Related Secured Obligations) owed or then due and payable to the Note Holders but without Make-Whole Amount. 
 SECTION
2.11. Voluntary Redemptions of Equipment Notes 
 (a) All (but not less than all) of the Equipment Notes may be redeemed by the
Owner upon at least 30 days’ revocable prior written notice to the Mortgagee and the Note Holders, and such Equipment Notes shall be redeemed in whole at a redemption price equal to 100% of the unpaid Original Amount thereof, together with
accrued interest thereon to the date of redemption and all other Secured Obligations (other than Related Secured Obligations) owed or then due and payable to the Note Holders plus Make-Whole Amount, if any, provided that no redemption shall
be permitted under this Section 2.11(a) unless simultaneously with such redemption all Related Series AA Equipment Notes, Related Series A Equipment Notes, and Related Series B Equipment Notes shall also be redeemed. 

  
 18 

 (b) All (but not less than all) of the Series A Equipment Notes may be redeemed by the Owner
upon at least 30 days’ revocable prior written notice to the Mortgagee and the Note Holders of such Series, and such Equipment Notes shall be redeemed in whole at a redemption price equal to 100% of the unpaid Original Amount thereof, together
with accrued interest thereon to the date of redemption and all other Secured Obligations (other than Related Secured Obligations) owed or then due and payable to the Note Holders of such Series plus Make-Whole Amount, if any; provided that
no redemption shall be permitted under this Section 2.11(b) unless the following conditions have been satisfied: (1) simultaneously with such redemption, the Related Series A Equipment Notes shall also be redeemed; and
(2) simultaneously with such redemption, new Series A Equipment Notes shall be reissued in accordance with Section 4(a)(vi) of the Note Purchase Agreement and Section 9.1(c) of the Intercreditor Agreement. 

(c) All (but not less than all) of the Series B Equipment Notes may be redeemed by the Owner upon at least 30 days’ revocable prior
written notice to the Mortgagee and the Note Holders of such Series, and such Equipment Notes shall be redeemed in whole at a redemption price equal to 100% of the unpaid Original Amount thereof, together with accrued interest thereon to the date of
redemption and all other Secured Obligations (other than Related Secured Obligations) owed or then due and payable to the Note Holders of such Series plus Make-Whole Amount, if any; provided that no redemption shall be permitted under this
Section 2.11(c) unless the following conditions have been satisfied: (1) simultaneously with such redemption, the Related Series B Equipment Notes shall also be redeemed; and (2) simultaneously with such redemption, new
Series B Equipment Notes shall be reissued in accordance with Section 4(a)(vi) of the Note Purchase Agreement and Section 9.1(c) of the Intercreditor Agreement. 

SECTION 2.12. Redemptions; Notice of Redemption 

(a) No redemption of any Equipment Note may be made except to the extent and in the manner expressly permitted by this Trust Indenture. No
purchase of any Equipment Note may be made by the Mortgagee. 
 (b) Notice of redemption with respect to the Equipment Notes shall be given
by the Mortgagee by first-class mail, postage prepaid, mailed not less than 20 nor more than 60 days prior to the applicable redemption date, to each Note Holder of such Equipment Notes to be redeemed, at such Note Holder’s address appearing in
the Equipment Note Register; provided that such notice shall be revocable by written notice from the Owner to Mortgagee given not later than three days prior to the redemption date. All notices of redemption shall state: (1) the redemption
date, (2) the applicable basis for determining the redemption price, (3) that on the redemption date, the redemption price will become due and payable upon each such Equipment Note, and that, if any such Equipment Notes are then
outstanding, interest on such Equipment Notes shall cease to accrue on and after such redemption date, and (4) the place or places where such Equipment Notes are to be surrendered for payment of the redemption price. 

(c) On or before the redemption date, the Owner (or any person on behalf of the Owner) shall, to the extent an amount equal to the redemption
price for the Equipment Notes to be redeemed on the redemption date shall not then be held by the Mortgagee, deposit or cause to be deposited with the Mortgagee by 12:30 PM New York time on the redemption date in immediately available funds the
redemption price of the Equipment Notes to be redeemed. 

  
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 (d) Notice of redemption having been given as aforesaid, the Equipment Notes to be redeemed
shall, on the redemption date, become due and payable at the Corporate Trust Office of the Mortgagee or at any office or agency maintained for such purposes pursuant to Section 2.07, and from and after such redemption date (unless there shall
be a default in the payment of the redemption price) any such Equipment Notes then outstanding shall cease to bear interest. Upon surrender of any such Equipment Note for redemption in accordance with said notice, such Equipment Note shall be
redeemed at the redemption price. If any Equipment Note called for redemption shall not be so paid upon surrender thereof for redemption, the principal amount thereof shall, until paid, continue to bear interest from the applicable redemption date
at the interest rate in effect for such Equipment Note as of such redemption date. 
 SECTION 2.13. Subordination 

(a) The Owner, each Note Holder (by acceptance of its Equipment Notes of any Series) and each Related Note Holder (by acceptance of its Related
Equipment Note), hereby agree that no payment or distribution shall be made on or in respect of the Secured Obligations owed to such Note Holder of such Series or owed to such Related Note Holder, including any payment or distribution of cash,
property or securities after the commencement of a proceeding of the type referred to in Section 5.01(v), (vi) or (vii) hereof, except as expressly provided in Article III hereof. 

(b) By the acceptance of its Equipment Notes of any Series (other than Series AA), each Note Holder of such Series agrees that in the event
that such Note Holder, in its capacity as a Note Holder, shall receive any payment or distribution on any Secured Obligations in respect of such Series which it is not entitled to receive under this Section 2.13 or Article III hereof, it will
hold any amount so received in trust for the Senior Holder (as defined in Section 2.13(c) hereof) and will forthwith turn over such payment to the Mortgagee in the form received to be applied as provided in Article III hereof. By the acceptance
of its Related Equipment Notes (other than Related Series AA Equipment Notes), each Related Note Holder agrees that in the event that such Related Note Holder, in its capacity as a Related Note Holder, shall receive any payment or distribution
pursuant to this Trust Indenture on any Related Secured Obligations which it is not entitled to receive under this Section 2.13 or Article III hereof, it will hold any amount so received in trust for the Senior Holder (as defined in
Section 2.13(c) hereof) and will forthwith turn over such payment to the Mortgagee in the form received to be applied as provided in Article III hereof. 

(c) As used in this Section 2.13, the term “Senior Holder” shall mean (i) the Note Holders of Series AA Equipment Notes and
Related Note Holders of the Related Series AA Equipment Notes until the Secured Obligations in respect of Series AA Equipment Notes and Related Series AA Equipment Notes have been paid in full, (ii) after the Secured Obligations in respect of
Series AA Equipment Notes and Related Series AA Equipment Notes have been paid in full, the Note Holders of Series A Equipment Notes and Related Note Holders of the Related Series A Equipment Notes until the Secured Obligations in respect of Series
A 

  
 20 

 
Equipment Notes and Related Series A Equipment Notes have been paid in full, (iii) after the Secured Obligations in respect of Series A Equipment Notes and Related Series A Equipment Notes
have been paid in full, the Note Holders of Series B Equipment Notes and Related Note Holders of the Related Series B Equipment Notes until the Secured Obligations in respect of the Series B Equipment Notes and the Related Series B Equipment Notes
have been paid in full, and (iv) after the Secured Obligations of the Series B Equipment Notes and Related Series B Equipment Notes have been paid in full, (and except as otherwise provided in an amendment to this Trust Indenture pursuant to
Section 10.01(b) hereof), the Note Holders of the Additional Series Equipment Notes, if issued, and Related Note Holders of the Related Additional Series Equipment Notes, if issued, until the Secured Obligations in respect of the Additional
Series Equipment Notes and Related Additional Series Equipment Notes have been paid in full. 
 ARTICLE III 

RECEIPT, DISTRIBUTION AND APPLICATION OF PAYMENTS 

SECTION 3.01. Basic Distributions 

Except as otherwise provided in Sections 3.02 and 3.03 hereof, each periodic payment of principal or interest on the Equipment Notes received
by the Mortgagee shall be promptly distributed in the following order of priority: 
  

	 	(i)	so much of such payment as shall be required to pay in full the aggregate amount of the payment or payments of Original Amount and interest (as well as any interest on any overdue Original Amount and, to the extent
permitted by Law, on any overdue interest) then due under all Series AA Equipment Notes shall be distributed to the Note Holders of Series AA ratably, without priority of one over the other, in the proportion that the amount of such payment or
payments then due under each Series AA Equipment Note bears to the aggregate amount of the payments then due under all Series AA Equipment Notes; 

  

	 	(ii)	after giving effect to paragraph (i) above, so much of such payment remaining as shall be required to pay in full the aggregate amount of the payment or payments of Original Amount and interest (as well as any
interest on any overdue Original Amount and, to the extent permitted by Law, on any overdue interest) then due under all Series A Equipment Notes shall be distributed to the Note Holders of Series A ratably, without priority of one over the other,
in the proportion that the amount of such payment or payments then due under each Series A Equipment Note bears to the aggregate amount of the payments then due under all Series A Equipment Notes; 

 

	 	(iii)	after giving effect to paragraph (ii) above, so much of such payment remaining as shall be required to pay in full the aggregate amount of the payment or payments of Original Amount and interest (as well as any
interest on any overdue Original Amount and, to the extent permitted by Law, on any overdue interest) then due under all Series B Equipment Notes shall be distributed to the Note Holders of Series B ratably, without priority of one over the other,
in the proportion that the amount of such payment or payments then due under each Series B Equipment Note bears to the aggregate amount of the payments then due under all Series B Equipment Notes; and 

  
 21 

	 	(iv)	after giving effect to paragraph (iii) above (and except as otherwise provided in an amendment to this Trust Indenture pursuant to Section 10.01(b) hereof), so much of such payment remaining as shall be
required to pay in full the aggregate amount of the payment or payments of Original Amount and interest (as well as any interest on any overdue Original Amount and, to the extent permitted by Law, on any overdue interest) then due under all
Additional Series Equipment Notes shall be distributed to the Note Holders of Additional Series ratably, without priority of one over the other, in the proportion that the amount of such payment or payments then due under each Additional Series
Equipment Note bears to the aggregate amount of the payments then due under all Additional Series Equipment Notes. 

SECTION 3.02. Event of Loss; Replacement; Optional Redemption 

Except as otherwise provided in Section 3.03 hereof, any payments received by the Mortgagee (i) with respect to the Airframe or the
Airframe and one or more Engines as the result of an Event of Loss pursuant to Section 2.10 or (ii) pursuant to an optional redemption of the Equipment Notes pursuant to Section 2.11 hereof shall be applied to redemption of the
Equipment Notes and to all other Secured Obligations then due by applying such funds in the following order of priority: 
  

	 	First,	(a) to reimburse the Mortgagee and the Note Holders for any reasonable costs or expenses incurred in connection with such redemption for which they are entitled to reimbursement, or indemnity by Owner, under the
Operative Agreements and then (b) to pay any other Secured Obligations then due (except as provided in clauses “Second” and “Third” below) to the Mortgagee, the Note Holders and the other Indenture Indemnitees under this
Trust Indenture, the Participation Agreement or the Equipment Notes (other than amounts specified in clauses “Second” and “Third” below); 

  

	 	Second,	(i) to pay the amounts specified in paragraph (i) of clause “Third” of Section 3.03 hereof plus Make-Whole Amount, if any, then due and payable in respect of the Series AA Equipment Notes, but
excluding distributions of amounts of Related Secured Obligations to Related Note Holders; 

  

	 	(ii)	after giving effect to paragraph (i) above, to pay the amounts specified in paragraph (ii) of clause “Third” of Section 3.03 hereof plus Make-Whole Amount, if any, then due and payable in
respect of the Series A Equipment Notes, but excluding distributions of amounts of Related Secured Obligations to Related Note Holders; 

  
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	 	(iii)	after giving effect to paragraph (ii) above, to pay the amounts specified in paragraph (iii) of clause “Third” of Section 3.03 hereof plus Make-Whole Amount, if any, then due and payable in
respect of the Series B Equipment Notes, but excluding distributions of amounts of Related Secured Obligations to Related Note Holders; and 

  

	 	(iv)	after giving effect to paragraph (iii) above, to pay the amounts specified in paragraph (iv) of clause “Third” of Section 3.03 hereof then due and payable in respect of the Additional Series
Equipment Notes, but excluding distributions of amounts of Related Secured Obligations to Related Note Holders; 

  

	 	Third,	(i) to pay the amounts specified in paragraph (i) of clause “Third” of Section 3.03 hereof then due and payable in respect of the Related Series AA Equipment Notes; 

 

	 	(ii)	after giving effect to paragraph (i) above, to pay the amounts specified in paragraph (ii) of clause “Third” of Section 3.03 hereof then due and payable in respect of the Related Series A
Equipment Notes; 

  

	 	(iii)	after giving effect to paragraph (ii) above, to pay the amounts specified in paragraph (iii) of clause “Third” of Section 3.03 hereof then due and payable in respect of the Related Series B
Equipment Notes; and 

  

	 	(iv)	after giving effect to paragraph (iii) above, to pay the amounts specified in paragraph (iv) of clause “Third” of Section 3.03 then due and payable in respect of the Related Additional Series
Equipment Notes; and 

  

	 	Fourth,	as provided in clause “Fourth” of Section 3.03 hereof; 

 provided, however,
that if a Replacement Airframe or Replacement Engine shall be substituted for the Airframe or Engine subject to such Event of Loss as provided in Section 4.05 hereof, any insurance, condemnation or similar proceeds which result from such Event
of Loss and are paid over to the Mortgagee shall be held by the Mortgagee as permitted by Section 7.04 hereof (provided that such moneys shall be invested as provided in Section 6.06 hereof) as additional security for the obligations of
Owner under Operative Agreements and such proceeds (and such investment earnings), to the extent not theretofore applied as provided herein, shall be released to the Owner at the Owner’s written request upon the release of such Airframe or
Engine and the replacement thereof as provided herein; provided, further, however, in the case of a redemption of Equipment Notes pursuant to Section 2.11(b) or Section 2.11(c), if a particular Series is not being
redeemed pursuant thereto, no application of funds shall be made pursuant to the paragraph in clause “Second” above that refers to such Series in connection with such redemption. No Make-Whole Amount shall be due and payable on the
Equipment Notes as a consequence of the redemption of the Equipment Notes as a result of an Event of Loss with respect to the Airframe or the Airframe and one or more Engines. 

  
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 SECTION 3.03. Payments After Event of Default 

Except as otherwise provided in Section 3.04 hereof, all payments received and amounts held or realized by the Mortgagee (including any
amounts realized by the Mortgagee from the exercise of any remedies pursuant to Article V hereof) after an Event of Default shall have occurred and be continuing, as well as all payments or amounts then held by the Mortgagee as part of the
Collateral, shall be promptly distributed by the Mortgagee in the following order of priority: 
  

	 	First,	so much of such payments or amounts as shall be required to (i) reimburse the Mortgagee or WTNA for any tax (except to the extent resulting from a failure of the Mortgagee to withhold taxes pursuant to
Section 2.04(b) hereof), expense or other loss (including, without limitation, all amounts to be expended at the expense of, or charged upon the rents, revenues, issues, products and profits of, the property included in the Collateral (all such
property being herein called the “Mortgaged Property”) pursuant to Section 5.03(b) hereof) incurred by the Mortgagee or WTNA (to the extent not previously reimbursed), the expenses of any sale, or other proceeding, reasonable
attorneys’ fees and expenses, court costs, and any other expenditures incurred or expenditures or advances made by the Mortgagee, WTNA or the Note Holders in the protection, exercise or enforcement of any right, power or remedy or any damages
sustained by the Mortgagee, WTNA or any Note Holder, liquidated or otherwise, upon such Event of Default shall be applied by the Mortgagee as between itself, WTNA and the Note Holders in reimbursement of such expenses and any other expenses for
which the Mortgagee, WTNA or the Note Holders are entitled to reimbursement under any Operative Agreement and (ii) pay all Secured Obligations payable to the other Indenture Indemnitees hereunder and under the Participation Agreement (other
than amounts specified in clauses Second and Third below); and in the case the aggregate amount to be so distributed is insufficient to pay as aforesaid in clauses (i) and (ii), then ratably, without priority of one over the other, in
proportion to the amounts owed each hereunder; 

  

	 	Second,	so much of such payments or amounts remaining as shall be required to reimburse the then existing or prior Note Holders for payments made pursuant to Section 6.03 hereof (to the extent not previously reimbursed)
shall be distributed to such then existing or prior Note Holders ratably, without priority of one over the other, in accordance with the amount of the payment or payments made by each such then existing or prior Note Holder pursuant to said
Section 6.03 hereof; 

  

	 	Third,	 (i) so much of such payments or amounts remaining as shall be required to pay in full the aggregate unpaid
Original Amount of all Series AA Equipment Notes, and the accrued but unpaid interest and other amounts due thereon and all other Secured Obligations in respect of the Series AA Equipment Notes to the date of distribution and all other Related
Secured Obligations in respect of Related Series AA Equipment Notes then due, shall be distributed to the Note Holders of Series AA and Related Note Holders of the Related Series AA Equipment Notes, and in case the aggregate amount so to be
distributed shall be insufficient to pay in full 

  
 24 

	 	
as aforesaid, then ratably, without priority of one over the other, to each Note Holder and Related Note Holder in the proportion that the aggregate unpaid Original Amount of all Series AA
Equipment Notes held by such holder plus the accrued but unpaid interest and other amounts due hereunder or thereunder to the date of distribution and all other Related Secured Obligations then due in respect of the Related Series AA Equipment Notes
held by such holder, bears to the aggregate unpaid Original Amount of all Series AA Equipment Notes plus the accrued but unpaid interest and other amounts due thereon to the date of distribution and all other Related Secured Obligations in respect
of the Related Series AA Equipment Notes then due; 

  

	 	(ii)	after giving effect to paragraph (i) above, so much of such payments or amounts remaining as shall be required to pay in full the aggregate unpaid Original Amount of all Series A Equipment Notes, and the accrued
but unpaid interest and other amounts due thereon and all other Secured Obligations in respect of the Series A Equipment Notes to the date of distribution and all other Related Secured Obligations in respect of Related Series A Equipment Notes then
due, shall be distributed to the Note Holders of Series A and Related Note Holders of the Related Series A Equipment Notes, and in case the aggregate amount so to be distributed shall be insufficient to pay in full as aforesaid, then ratably,
without priority of one over the other, to each Note Holder and Related Note Holder in the proportion that the aggregate unpaid Original Amount of all Series A Equipment Notes held by such holder plus the accrued but unpaid interest and other
amounts due hereunder or thereunder to the date of distribution and all other Related Secured Obligations then due in respect of the Related Series A Equipment Notes held by such holder, bears to the aggregate unpaid Original Amount of all Series A
Equipment Notes plus the accrued but unpaid interest and other amounts due thereon to the date of distribution and all other Related Secured Obligations in respect of the Related Series A Equipment Notes then due; 

 

	 	(iii)	after giving effect to paragraph (ii) above, so much of such payments or amounts remaining as shall be required to pay in full the aggregate unpaid Original Amount of all Series B Equipment Notes, and the accrued
but unpaid interest and other amounts due thereon and all other Secured Obligations in respect of the Series B Equipment Notes to the date of distribution and all other Related Secured Obligations in respect of Related Series B Equipment Notes then
due, shall be distributed to the Note Holders of Series B and Related Note Holders of the Related Series B Equipment Notes, and in case the aggregate amount so to be distributed shall be insufficient to pay in full as aforesaid, then ratably,
without priority of one over the other, to each Note Holder and Related Note Holder in the proportion that the aggregate unpaid Original Amount of all Series B Equipment Notes held by such holder plus the accrued but unpaid interest and other
amounts due hereunder or thereunder to the date of distribution and all other Related Secured Obligations then due in respect of the Related Series B Equipment Notes held by such holder, bears to the aggregate unpaid Original Amount of all Series B
Equipment Notes plus the accrued but unpaid interest and other amounts due thereon to the date of distribution and all other Related Secured Obligations in respect of the Related Series B Equipment Notes then due; 

  
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	 	(iv)	after giving effect to paragraph (iii) above (and except as otherwise provided in an amendment to this Trust Indenture pursuant to Section 10.01(b) hereof), so much of such payments or amounts remaining as
shall be required to pay in full the aggregate unpaid Original Amount of all Additional Series Equipment Notes, and the accrued but unpaid interest and other amounts due thereon and all other Secured Obligations in respect of the Additional Series
Equipment Notes to the date of distribution and all other Related Secured Obligations in respect of the Related Additional Series Equipment Notes then due, shall be distributed to the Note Holders of Additional Series and Related Note Holders of the
Related Additional Series Equipment Notes, and in case the aggregate amount so to be distributed shall be insufficient to pay in full as aforesaid, then ratably, without priority of one over the other, in the proportion that the aggregate unpaid
Original Amount of all Additional Series Equipment Notes held by each holder plus the accrued but unpaid interest and other amounts due hereunder or thereunder to the date of distribution and all other Related Secured Obligations then due in respect
of Related Additional Series Equipment Notes held by such holder, bears to the aggregate unpaid Original Amount of all Additional Series Equipment Notes held by all such holders plus the accrued but unpaid interest and other amounts due thereon to
the date of distribution and all other Related Secured Obligations in respect of Related Additional Series Equipment Notes then due; and 

  

	 	(v)	after giving effect to paragraph (iv) above, if any Related Equipment Note is outstanding, any of such payments or amounts remaining and any invested Cash Equivalents shall be held by the Mortgagee in an Eligible
Account in accordance with the provisions of Section 3.07 (and invested as provided in Section 6.06 hereof) as additional security for the Related Secured Obligations, and such amounts (and any investment earnings thereon) shall be
distributed from time to time in accordance with the foregoing provisions of this clause “Third” as and to the extent any Related Secured Obligation shall at any time and from time to time become due and remain unpaid after the giving of
any required notice and the expiration of any applicable grace period; and, upon the payment in full of all Related Secured Obligations the balance, if any, of any such remaining amounts and investment earnings thereon shall be applied as provided
in clause Fourth of this Section 3.03; and 

  

	 	Fourth,	the balance, if any, of such payments or amounts remaining thereafter shall be distributed to the Owner. 

No Make-Whole Amount shall be due and payable on the Equipment Notes as a consequence of the acceleration of the Equipment Notes as a result
of an Event of Default. 

  
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 SECTION 3.04. Certain Payments 

(a) Any payments received by the Mortgagee for which no provision as to the application thereof is made in this Trust Indenture and for which
such provision is made in any other Operative Agreement shall be applied forthwith to the purpose for which such payment was made in accordance with the terms of such other Operative Agreement, as the case may be. 

(b) Notwithstanding anything to the contrary contained in this Article III, the Mortgagee will distribute promptly upon receipt any indemnity
payment received by it from the Owner in respect of the Mortgagee in its individual capacity, any Note Holder or any other Indenture Indemnitee, in each case whether or not pursuant to Section 8 of the Participation Agreement, directly to the
Person entitled thereto. Any payment received by the Mortgagee under the third paragraph of Section 2.02 shall be distributed to the Subordination Agent in its capacity as Note Holder to be distributed in accordance with the terms of the
Intercreditor Agreement. 
 (c) For the avoidance of doubt, no amount will be distributed pursuant to this Article III to any holder of a
note issued under a Related Indenture that is not a Related Note Holder (as such). 
 SECTION 3.05. Other Payments 

Any payments received by the Mortgagee for which no provision as to the application thereof is made elsewhere in this Trust Indenture or in any
other Operative Agreement shall be distributed by the Mortgagee to the extent received or realized at any time, in the order of priority specified in Section 3.01 hereof, and after payment in full of all amounts then due in accordance with
Section 3.01 in the manner provided in clause “Fourth” of Section 3.03 hereof. 
 SECTION 3.06. Cooperation

 Prior to making any distribution under this Article III, the Mortgagee shall consult with the Related Mortgagees to determine amounts
payable with respect to the Related Secured Obligations. The Mortgagee shall cooperate with the Related Mortgagees and shall provide such information as shall be reasonably requested by each Related Mortgagee to enable such Related Mortgagee to
determine amounts distributable under Article III of its Related Indenture. 
 SECTION 3.07. Securities Account 

In furtherance of the provisions of Section 3.03 of this Trust Indenture, WTNA agrees to act as an Eligible Institution under this Trust
Indenture in accordance with the provisions of this Trust Indenture. Except as otherwise expressly provided in this Trust Indenture, WTNA waives any claim or lien against any Eligible Account it may have, by operation of law or otherwise, for any
amount owed to it by Owner. The Mortgagee hereby agrees that, notwithstanding anything to the contrary in this Trust Indenture, (i) any amounts to be held by the Mortgagee pursuant to paragraph (v) of clause “Third” of
Section 3.03 and any investment earnings thereon or other Cash Equivalents will be credited to an Eligible Account 

  
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(the “Securities Account”) for which it is a “securities intermediary” (as defined in Section 8-102(a)(14) of the NY UCC) and the
Mortgagee is the “entitlement holder” (as defined in Section 8-102(a)(7) of the NY UCC) of the “securities entitlement” (as defined in
Section 8-102(a)(17) of the NY UCC) with respect to each “financial asset” (as defined in Section 8-102(a)(9) of the NY UCC) credited to such
Eligible Account, (ii) all such amounts, Cash Equivalents and all other property acquired with cash credited to the Securities Account will be credited to the Securities Account, (iii) all items of property (whether cash, investment
property, Cash Equivalents, other investments, securities, instruments or other property) credited to the Securities Account will be treated as a “financial asset” under Article 8 of the NY UCC, (iv) its “securities
intermediary’s jurisdiction” (as defined in Section 8-110(e) of the NY UCC) with respect to the Securities Account is the State of New York, and (v) all securities, instruments and other
property in order or registered from and credited to the Securities Account shall be payable to or to the order of, or registered in the name of, the Mortgagee or shall be indorsed to the Mortgagee or in blank, and in no case whatsoever shall any
financial asset credited to the Securities Account be registered in the name of the Owner, payable to or to the order of the Owner or specially indorsed to the Owner except to the extent the foregoing have been specially endorsed by the Owner to the
Mortgagee or in blank. The Mortgagee agrees that it will hold (and will indicate clearly in its books and records that it holds) its “securities entitlement” to the “financial assets” credited to the Securities Account in trust
for the benefit of the Note Holders and each of the Indenture Indemnitees as set forth in this Trust Indenture. The Owner acknowledges that, by reason of the Mortgagee being the “entitlement holder” in respect of the Securities Account as
provided above, the Mortgagee shall have the sole right and discretion, subject only to the terms of this Trust Indenture, to give all “entitlement orders” (as defined in Section 8-102(a)(8) of
the NY UCC) with respect to the Securities Account and any and all financial assets and other property credited thereto to the exclusion of the Owner. 

ARTICLE IV 
 COVENANTS
OF THE OWNER 
 SECTION 4.01. Liens 

The Owner will not directly or indirectly create, incur, assume or suffer to exist any Lien on or with respect to the Airframe or any Engine,
title to any of the foregoing or any interest of Owner therein, except Permitted Liens. The Owner shall promptly, at its own expense, take such action as may be necessary to duly discharge (by bonding or otherwise) any Lien other than a Permitted
Lien arising at any time. 
 SECTION 4.02. Possession, Operation and Use, Maintenance, Registration and Markings 

(a) General. Except as otherwise expressly provided herein, the Owner shall be entitled to operate, use, locate, employ or otherwise
utilize or not utilize the Airframe, any Engine or any Parts in any lawful manner or place in accordance with the Owner’s business judgment. 

  
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 (b) Possession. The Owner, without the prior consent of Mortgagee, shall not lease or
otherwise in any manner deliver, transfer or relinquish possession of the Aircraft, the Airframe or any Engine or install any Engine, or permit any Engine to be installed, on any airframe other than the Airframe; except that the Owner may, without
such prior written consent of Mortgagee: 
 (i) Subject or permit any Permitted Lessee to subject (i) the Airframe to normal
interchange agreements or (ii) any Engine to normal interchange, pooling, borrowing or similar arrangements, in each case customary in the commercial airline industry and entered into by Owner or such Permitted Lessee, as the case may be, in
the ordinary course of business; provided, however, that if Owner’s title to any such Engine is divested under any such agreement or arrangement, then such Engine shall be deemed to have suffered an Event of Loss as of the date of
such divestiture, and Owner shall comply with Section 4.04(e) in respect thereof; 
 (ii) Deliver or permit any Permitted Lessee to
deliver possession of the Aircraft, Airframe, any Engine or any Part (x) to the manufacturer thereof or to any third-party maintenance provider for testing, service, repair, maintenance or overhaul work on the Aircraft, Airframe, any Engine or
any Part, or, to the extent required or permitted by Section 4.04, for alterations or modifications in or additions to the Aircraft, Airframe or any Engine or (y) to any Person for the purpose of transport to a Person referred to in the
preceding clause (x); 
 (iii) Install or permit any Permitted Lessee to install an Engine on an airframe owned by Owner or such Permitted
Lessee, as the case may be, free and clear of all Liens, except (x) Permitted Liens and those that do not apply to the Engines, and (y) the rights of third parties under normal interchange or pooling agreements and arrangements of the type
that would be permitted under Section 4.02(b)(i); 
 (iv) Install or permit any Permitted Lessee to install an Engine on an airframe
leased to Owner or such Permitted Lessee, or purchased by Owner or such Permitted Lessee subject to a mortgage, security agreement, conditional sale or other secured financing arrangement, but only if (x) such airframe is free and clear of all
Liens, except (A) the rights of the parties to such lease, or any such secured financing arrangement, covering such airframe and (B) Liens of the type permitted by clause (iii) above and (y) Owner or Permitted Lessee, as the case
may be, shall have received from the lessor, mortgagee, secured party or conditional seller, in respect of such airframe, a written agreement (which may be a copy of the lease, mortgage, security agreement, conditional sale or other agreement
covering such airframe), whereby such Person agrees that it will not acquire or claim any right, title or interest in, or Lien on, such Engine by reason of such Engine being installed on such airframe at any time while such Engine is subject to the
Lien of this Trust Indenture; 
 (v) Install or permit any Permitted Lessee to install an Engine on an airframe owned by Owner or such
Permitted Lessee, leased to Owner or such Permitted Lessee, or purchased by Owner or such Permitted Lessee subject to a conditional sale or other security agreement under circumstances where neither clause (iii) or (iv) above is applicable;
provided, however, that any such installation shall be deemed an Event of Loss with respect to such Engine, and Owner shall comply with Section 4.04(e) hereof in respect thereof; 

  
 29 

 (vi) Transfer or permit any Permitted Lessee to transfer possession of the Aircraft, Airframe or
any Engine to the U.S. Government, in which event Owner shall promptly notify Mortgagee in writing of any such transfer of possession and, in the case of any transfer pursuant to CRAF, in such notification shall identify by name, address and
telephone numbers the Contracting Office Representative or Representatives for the Military Airlift Command of the United States Air Force to whom notices must be given and to whom requests or claims must be made to the extent applicable under CRAF;

 (vii) Enter into a charter or Wet Lease or other similar arrangement with respect to the Aircraft or any other aircraft on which any
Engine may be installed (which shall not be considered a transfer of possession hereunder); provided that the Owner’s obligations hereunder shall continue in full force and effect notwithstanding any such charter or Wet Lease or
other similar arrangement; 
 (viii) So long as no Event of Default shall have occurred and be continuing, and subject to the provisions of
the immediately following paragraph, enter into a lease with respect to the Aircraft, Airframe or any Engine to any Permitted Air Carrier that is not then subject to any bankruptcy, insolvency, liquidation, reorganization, dissolution or similar
proceeding and shall not have substantially all of its property in the possession of any liquidator, trustee, receiver or similar person; provided that, in the case only of a lease to a Permitted Foreign Air Carrier, (A) the
United States maintains diplomatic relations with the country of domicile of such Permitted Foreign Air Carrier (or, in the case of Taiwan, diplomatic relations at least as good as those in effect on the Closing Date) and (B) Owner shall have
furnished Mortgagee a favorable opinion of counsel, reasonably satisfactory to Mortgagee, in the country of domicile of such Permitted Foreign Air Carrier, that (v) the terms of such lease are the legal, valid and binding obligations of the
parties thereto enforceable under the laws of such jurisdiction, (w) it is not necessary for Mortgagee to register or qualify to do business in such jurisdiction, if not already so registered or qualified, as a result, in whole or in part, of
the proposed lease, (x) Mortgagee’s Lien in respect of, the Aircraft, Airframe and Engines will be recognized in such jurisdiction, (y) the Laws of such jurisdiction of domicile require fair compensation by the government of such
jurisdiction, payable in a currency freely convertible into Dollars, for the loss of title to the Aircraft, Airframe or Engines in the event of the requisition by such government of such title (unless Owner shall provide insurance in the amounts
required with respect to hull insurance under this Trust Indenture covering the requisition of title to the Aircraft, Airframe or Engines by the government of such jurisdiction so long as the Aircraft, Airframe or Engines are subject to such lease)
and (z) the agreement of such Permitted Air Carrier that its rights under the lease are subject and subordinate to all the terms of this Trust Indenture is enforceable against such Permitted Air Carrier under applicable law; 

provided that (1) the rights of any transferee who receives possession by reason of a transfer permitted by any of clauses (i) through
(viii) of this Section 4.02(b) (other than by a transfer of an Engine which is deemed an Event of Loss) shall be subject and subordinate to all the terms of this Trust Indenture, (2) the Owner shall remain primarily liable for the
performance of all of the terms of this Trust Indenture and all the terms and conditions of this Trust Indenture and the 

  
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 other Operative Agreements shall remain in effect and (3) no lease or transfer of possession otherwise in
compliance with this Section 4.02(b) shall (x) result in any registration or re-registration of an Aircraft, except to the extent permitted by Section 4.02(e) or the maintenance, operation or
use thereof except in compliance with Sections 4.02(c) and 4.02(d) or (y) permit any action not permitted to the Owner hereunder. 
 In
the case of any lease permitted under this Section 4.02(b), the Owner will include in such lease appropriate provisions which (t) make such lease expressly subject and subordinate to all of the terms of this Trust Indenture, including the
rights of the Mortgagee to avoid such lease in the exercise of its rights to repossession of the Airframe and Engines hereunder; (u) require the Permitted Lessee to comply with the terms of Section 4.06; and (v) require that the
Airframe or any Engine subject thereto be used in accordance with the limitations applicable to the Owner’s possession and use provided in this Trust Indenture. No lease permitted under this Section 4.02(b) shall be entered into unless
(w) Owner shall provide written notice to Mortgagee (such notice in the event of a lease to a U.S. Air Carrier to be given promptly after entering into any such lease or, in the case of a lease to any other Permitted Air Carrier, 10 days in
advance of entering into such lease); (x) Owner shall furnish to Mortgagee evidence reasonably satisfactory to Mortgagee that the insurance required by Section 4.06 remains in effect; (y) all necessary documents shall have been duly
filed, registered or recorded in such public offices as may be required fully to preserve the first priority security interest and International Interest (subject to Permitted Liens) of Mortgagee in the Aircraft, Airframe and Engines; and
(z) Owner shall reimburse Mortgagee for all of its reasonable out-of-pocket fees and expenses, including, without limitation, reasonable fees and disbursements of
counsel, incurred by Mortgagee in connection with any such lease. Except as otherwise provided herein and without in any way relieving the Owner from its primary obligation for the performance of its obligations under this Trust Indenture, the Owner
may in its sole discretion permit a lessee to exercise any or all rights which the Owner would be entitled to exercise under Sections 4.02 and 4.04, and may cause a lessee to perform any or all of the Owner’s obligations under Article IV, and
the Mortgagee agrees to accept actual and full performance thereof by a lessee in lieu of performance by the Owner. 
 Mortgagee hereby
agrees, and each Note Holder and Related Note Holder by acceptance of an Equipment Note and a Related Equipment Note, respectively, agrees, for the benefit of each lessor, conditional seller, indenture trustee or secured party of any engine leased
to, or purchased by, Owner or any Permitted Lessee subject to a lease, conditional sale, trust indenture or other security agreement that Mortgagee, each Note Holder and Related Note Holder and their respective successors and assigns will not
acquire or claim, as against such lessor, conditional seller, indenture trustee or secured party, any right, title or interest in any engine as the result of such engine being installed on the Airframe at any time while such engine is subject to
such lease, conditional sale, trust indenture or other security agreement and owned by such lessor or conditional seller or subject to a trust indenture or security interest in favor of such indenture trustee or secured party. 

(c) Operation and Use. So long as the Aircraft, Airframe or any Engine is subject to the Lien of this Trust Indenture, the Owner shall
not operate, use or locate the Aircraft, Airframe or any Engine, or allow the Aircraft, Airframe or any Engine to be operated, used or located, (i) in any area excluded from coverage by any insurance required by 

  
 31 

 
the terms of Section 4.06, except in the case of a requisition by the U.S. Government where the Owner obtains indemnity in lieu of such insurance from the U.S. Government, or insurance from
the U.S. Government, against substantially the same risks and for at least the amounts of the insurance required by Section 4.06 covering such area, or (ii) in any recognized area of hostilities unless covered in accordance with
Section 4.06 by war risk insurance, or in either case unless the Aircraft, the Airframe or any Engine is only temporarily operated, used or located in such area as a result of an emergency, equipment malfunction, navigational error, hijacking,
weather condition or other similar unforeseen circumstance, so long as Owner diligently and in good faith proceeds to remove the Aircraft from such area. So long as the Aircraft, the Airframe or any Engine is subject to the Lien of this Trust
Indenture, the Owner shall not permit such Aircraft, Airframe or any Engine, as the case may be, to be used, operated, maintained, serviced, repaired or overhauled (x) in violation of any Law binding on or applicable to such Aircraft, Airframe
or Engine or (y) in violation of any airworthiness certificate, license or registration of any Government Entity relating to the Aircraft, the Airframe or any Engine, except (i) immaterial or
non-recurring violations with respect to which corrective measures are taken promptly by Owner or Permitted Lessee, as the case may be, upon discovery thereof, or (ii) to the extent the validity or
application of any such Law or requirement relating to any such certificate, license or registration is being contested in good faith by Owner or Permitted Lessee in any reasonable manner which does not involve any material risk of the sale,
forfeiture or loss of the Aircraft, Airframe or any Engine, any material risk of criminal liability or material civil penalty against Mortgagee or impair the Mortgagee’s security interest or International Interest in the Aircraft, Airframe or
any Engine. 
 (d) Maintenance and Repair. So long as the Aircraft, Airframe or any Engine is subject to the Lien of this Trust
Indenture, the Owner shall cause the Aircraft, Airframe and each Engine to be maintained, serviced, repaired and overhauled in accordance with (i) maintenance standards required by or substantially equivalent to those required by the FAA, the
EASA or the central aviation authority of Canada or Japan for the Aircraft, Airframe and Engines, so as to (A) keep the Aircraft, the Airframe and each Engine in as good operating condition as on the Closing Date, ordinary wear and tear
excepted, (B) keep the Aircraft in such operating condition as may be necessary to enable the applicable airworthiness certification of such Aircraft to be maintained under the regulations of the FAA or other Aviation Authority then having
jurisdiction over the operation of the Aircraft, except during (x) temporary periods of storage in accordance with applicable regulations, (y) maintenance and modification permitted hereunder or (z) periods when the FAA or such other
Aviation Authority has revoked or suspended the airworthiness certificates for Similar Aircraft; and (ii) except during periods when a Permitted Lease is in effect, the same standards as Owner uses with respect to similar aircraft of similar
size in its fleet operated by Owner in similar circumstances and, during any period in which a Permitted Lease is in effect, the same standards used by the Permitted Lessee with respect to similar aircraft of similar size in its fleet and operated
by the Permitted Lessee in similar circumstances (it being understood that this clause (ii) shall not limit Owner’s obligations under the preceding clause (i)). Owner further agrees that the Aircraft, Airframe and Engines will be
maintained, used, serviced, repaired, overhauled or inspected in compliance with applicable Laws with respect to the maintenance of the Aircraft and in compliance with each applicable airworthiness certificate, license and registration relating to
the Aircraft, Airframe or any Engine issued by the Aviation Authority, other than minor or nonrecurring violations with 

  
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 respect to which corrective measures are taken upon discovery thereof and except to the extent Owner or Permitted
Lessee is contesting in good faith the validity or application of any such Law or requirement relating to any such certificate, license or registration in any reasonable manner which does not create a material risk of sale, loss or forfeiture of the
Aircraft, the Airframe or any Engine or the interest of Mortgagee therein, or any material risk of criminal liability or material civil penalty against Mortgagee. The Owner shall maintain or cause to be maintained the Aircraft Documents in the
English language. 
 (e) Registration. The Owner on or prior to the date of the Closing shall cause the Aircraft to be duly
registered in its name under the Act and except as otherwise permitted by this Section 4.02(e) at all times thereafter shall cause the Aircraft to remain so registered. So long as no Special Default or Event of Default shall have occurred and
be continuing, Owner may, by written notice to Mortgagee, request to change the country of registration of the Aircraft. Any such change in registration shall be effected only in compliance with, and subject to all of the conditions set forth in,
Section 6.4.5 of the Participation Agreement. Unless this Trust Indenture has been discharged, Owner shall also cause this Trust Indenture to be duly recorded and at all times maintained of record as a first-priority perfected mortgage (subject
to Permitted Liens) on the Aircraft, the Airframe and each of the Engines (except to the extent such perfection or priority cannot be maintained solely as a result of the failure by Mortgagee to execute and deliver any necessary documents). Unless
the Lien of this Indenture has been discharged, Owner shall cause the International Interest granted under this Indenture in favor of the Mortgagee in each Airframe and Engine to be registered on the International Registry as an International
Interest on such Airframe and Engine, subject to the Mortgagee providing its consent to the International Registry with respect thereto, and shall cause the sale to Owner of the Airframe and each Engine on the Delivery Date to be registered on the
International Registry. 
 (f) Markings. If permitted by applicable Law, on or reasonably promptly after the Closing Date, Owner will
cause to be affixed to, and maintained in, the cockpit of the Airframe and on each Engine, in each case, in a clearly visible location, a placard of a reasonable size and shape bearing the legend: “Subject to a security interest in favor of
Wilmington Trust, National Association, not in its individual capacity but solely as Mortgagee.” Such placards may be removed temporarily, if necessary, in the course of maintenance of the Airframe or Engines. If any such placard is damaged or
becomes illegible, Owner shall promptly replace it with a placard complying with the requirements of this Section. 
 SECTION
4.03. Inspection 
 (a) At all reasonable times, so long as the Aircraft is subject to the Lien of this Trust Indenture, Mortgagee
and its authorized representatives (the “Inspecting Parties”) may (not more than once every 12 months unless an Event of Default has occurred and is continuing then such inspection right shall not be so limited) inspect the Aircraft,
Airframe and Engines (including without limitation, the Aircraft Documents) and any such Inspecting Party may make copies of such Aircraft Documents not reasonably deemed confidential by Owner or such Permitted Lessee. 

  
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 (b) Any inspection of the Aircraft hereunder shall be limited to a visual, walk-around
inspection and shall not include the opening of any panels, bays or other components of the Aircraft, and no such inspection shall interfere with Owner’s or any Permitted Lessee’s maintenance and operation of the Aircraft, Airframe and
Engines. 
 (c) With respect to such rights of inspection, Mortgagee shall not have any duty or liability to make, or any duty or liability
by reason of not making, any such visit, inspection or survey. 
 (d) Each Inspecting Party shall bear its own expenses in connection with
any such inspection (including the cost of any copies made in accordance with Section 4.03(a)). 
 SECTION 4.04. Replacement
and Pooling of Parts, Alterations, Modifications and Additions; Substitution Rights 
 (a) Replacement of Parts. Except as
otherwise provided herein, so long as the Airframe or Engine is subject to the Lien of this Indenture, Owner, at its own cost and expense, will, or will cause a Permitted Lessee to, at its own cost and expense, promptly replace (or cause to be
replaced) all Parts which may from time to time be incorporated or installed in or attached to the Aircraft, Airframe or any Engine and which may from time to time become worn out, lost, stolen, destroyed, seized, confiscated, damaged beyond repair
or permanently rendered unfit for use for any reason whatsoever. In addition, Owner may, at its own cost and expense, or may permit a Permitted Lessee at its own cost and expense to, remove (or cause to be removed) in the ordinary course of
maintenance, service, repair, overhaul or testing any Parts, whether or not worn out, lost, stolen, destroyed, seized, confiscated, damaged beyond repair or permanently rendered unfit for use; provided, however, that Owner, except as
otherwise provided herein, at its own cost and expense, will, or will cause a Permitted Lessee at its own cost and expense to, replace such Parts as promptly as practicable. All replacement parts shall be free and clear of all Liens, except for
Permitted Liens and pooling arrangements to the extent permitted by Section 4.04(c) below (and except in the case of replacement property temporarily installed on an emergency basis) and shall be in good operating condition and have a value and
utility not less than the value and utility of the Parts replaced (assuming such replaced Parts were in the condition required hereunder). 

(b) Parts. Except as otherwise provided herein, any Part at any time removed from the Airframe or any Engine shall remain subject to
the Lien of this Trust Indenture, no matter where located, until such time as such Part shall be replaced by a part that has been incorporated or installed in or attached to such Airframe or any Engine and that meets the requirements for replacement
parts specified above. Immediately upon any replacement part becoming incorporated or installed in or attached to such Airframe or any Engine as provided in Section 4.04(a), without further act, (i) the replaced Part shall thereupon be
free and clear of all rights of the Mortgagee and shall no longer be deemed a Part hereunder, and (ii) such replacement part shall become a Part subject to this Trust Indenture and be deemed part of such Airframe or any Engine, as the case may
be, for all purposes hereof to the same extent as the Parts originally incorporated or installed in or attached to such Airframe or any Engine. 

  
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 (c) Pooling of Parts. Any Part removed from the Aircraft, Airframe or an Engine may be
subjected by the Owner or a Permitted Lessee to a normal pooling arrangement customary in the airline industry and entered into in the ordinary course of business of Owner or Permitted Lessee, provided that the part replacing such
removed Part shall be incorporated or installed in or attached to such Airframe or any Engine in accordance with Sections 4.04(a) and 4.04(b) as promptly as practicable after the removal of such removed Part. In addition, any replacement part when
incorporated or installed in or attached to the Airframe or any Engine may be owned by any third party, subject to a normal pooling arrangement, so long as the Owner or a Permitted Lessee, at its own cost and expense, as promptly thereafter as
reasonably possible, either (i) causes such replacement part to become subject to the Lien of this Trust Indenture, free and clear of all Liens except Permitted Liens, at which time such replacement part shall become a Part or
(ii) replaces (or causes to be replaced) such replacement part by incorporating or installing in or attaching to the Aircraft, Airframe or any Engine a further replacement part owned by the Owner free and clear of all Liens except Permitted
Liens and which shall become subject to the Lien of this Trust Indenture in accordance with Section 4.04(b). 
 (d) Alterations,
Modifications and Additions. The Owner shall, or shall cause a Permitted Lessee to, make (or cause to be made) alterations and modifications in and additions to the Aircraft, Airframe and each Engine as may be required to be made from time to
time to meet the applicable standards of the FAA or other Aviation Authority having jurisdiction over the operation of the Aircraft, to the extent made mandatory in respect of the Aircraft (a “Mandatory Modification”); provided
however, that the Owner or a Permitted Lessee may, in good faith and by appropriate procedure, contest the validity or application of any law, rule, regulation or order in any reasonable manner which does not materially adversely affect
Mortgagee’s interest in the Aircraft, does not impair the Mortgagee’s security interest or International Interest in the Aircraft and does not involve any material risk of sale, forfeiture or loss of the Aircraft or the interest of
Mortgagee therein, or any material risk of material civil penalty or any material risk of criminal liability being imposed on Mortgagee or the holder of any Equipment Note. In addition, the Owner, at its own expense, may, or may permit a Permitted
Lessee at its own cost and expense to, from time to time make or cause to be made such alterations and modifications in and additions to the Airframe or any Engine (each an “Optional Modification”) as the Owner or such Permitted Lessee may
deem desirable in the proper conduct of its business including, without limitation, removal of Parts which Owner deems are obsolete or no longer suitable or appropriate for use in the Aircraft, Airframe or such Engine; provided,
however, that no such Optional Modification shall (i) materially diminish the fair market value, utility, or useful life of the Aircraft or any Engine below its fair market value, utility or useful life immediately prior to such Optional
Modification (assuming the Aircraft or such Engine was in the condition required by this Trust Indenture immediately prior to such Optional Modification) or (ii) cause the Aircraft to cease to have the applicable standard certificate of
airworthiness except that such certificate of airworthiness temporarily may be replaced by an experimental certificate during the process of implementing and testing such Optional Modification and securing related FAA re-certification of the Aircraft. All Parts incorporated or installed in or attached to any Airframe or any Engine as the result of any alteration, modification or addition effected by the Owner shall be free and
clear of any Liens except Permitted Liens and become subject to the Lien of this Trust Indenture; provided that the 

  
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Owner or any Permitted Lessee may, at any time so long as the Airframe or any Engine is subject to the Lien of this Trust Indenture, remove any such Part (such Part being referred to herein as a
“Removable Part”) from such Airframe or an Engine if (i) such Part is in addition to, and not in replacement of or in substitution for, any Part originally incorporated or installed in or attached to such Airframe or any Engine at the
time of delivery thereof hereunder or any Part in replacement of, or in substitution for, any such original Part, (ii) such Part is not required to be incorporated or installed in or attached or added to such Airframe or any Engine pursuant to
the terms of Section 4.02(d) or the first sentence of this Section 4.04(d) and (iii) such Part can be removed from such Airframe or any Engine without materially diminishing the fair market value, utility or remaining useful life
which such Airframe or any Engine would have had at the time of removal had such removal not been effected by the Owner, assuming the Aircraft was otherwise maintained in the condition required by this Trust Indenture and such Removable Part had not
been incorporated or installed in or attached to the Aircraft, Airframe or such Engine. Upon the removal by the Owner of any such Part as above provided in this Section 4.04(d), title thereto shall, without further act, be free and clear of all
rights of the Mortgagee and such Part shall no longer be deemed a Part hereunder. Removable Parts may be leased from or financed by third parties other than Mortgagee. 

(e) Substitution of Engines. Upon the occurrence of an Event of Loss with respect to an Engine under circumstances in which an Event of
Loss with respect to the Airframe has not occurred, Owner shall promptly (and in any event within 15 days after such occurrence) give the Mortgagee written notice of such Event of Loss. The Owner shall have the right at its option at any time, on at
least 5 Business Days’ prior notice to the Mortgagee, to substitute, and if an Event of Loss shall have occurred with respect to an Engine under circumstances in which an Event of Loss with respect to the Airframe has not occurred, shall within
60 days of the occurrence of such Event of Loss substitute, a Replacement Engine for any Engine. In such event, immediately upon the effectiveness of such substitution and without further act, (i) the replaced Engine shall thereupon be free and
clear of all rights of the Mortgagee and the Lien of this Trust Indenture and shall no longer be deemed an Engine hereunder and (ii) such Replacement Engine shall become subject to this Trust Indenture and be deemed part of the Aircraft for all
purposes hereof to the same extent as the replaced Engine. Such Replacement Engine shall be an engine manufactured by Engine Manufacturer that is the same model as the Engine to be replaced thereby, or an improved model, and that is suitable for
installation and use on the Airframe, and that has a value, utility and remaining useful life (without regard to hours and cycles remaining until overhaul) at least equal to the Engine to be replaced thereby (assuming that such Engine had been
maintained in accordance with this Trust Indenture). The Owner’s right to make a replacement hereunder shall be subject to the fulfillment (which may be simultaneous with such replacement) of the following conditions precedent at the
Owner’s sole cost and expense, and the Mortgagee agrees to cooperate with the Owner to the extent necessary to enable it to timely satisfy such conditions: 

(i) an executed counterpart of each of the following documents shall be delivered to the Mortgagee: 

(A) a Trust Indenture Supplement covering the Replacement Engine, which shall have been duly filed for recordation pursuant to
the Act or such other applicable law of the jurisdiction other than the United States in which the Aircraft of which such Engine is a part is registered in accordance with Section 4.02(e), as the case may be;

  
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 (B) a full warranty bill of sale (as to title), covering the Replacement Engine,
executed by the former owner thereof in favor of the Owner (or, at the Owner’s option, other evidence of the Owner’s ownership of such Replacement Engine, reasonably satisfactory to the Mortgagee); and 

(C) UCC financing statements covering the security interests created by this Trust Indenture (or any similar statements or
other documents required to be filed or delivered pursuant to the laws of the jurisdiction in which such Aircraft may be registered) as are deemed necessary or desirable by counsel for the Mortgagee to protect the security interests of the Mortgagee
in the Replacement Engine; 
 (ii) the Owner shall cause to be delivered to the Mortgagee an opinion of counsel to the effect that the Lien
of this Trust Indenture continues to be in full force and effect with respect to the Replacement Engine and such evidence of compliance with the insurance provisions of Section 4.06 with respect to such Replacement Engine as Mortgagee shall
reasonably request; 
 (iii) the Owner shall have furnished to Mortgagee an opinion of Owner’s aviation law counsel reasonably
satisfactory to Mortgagee and addressed to Mortgagee as to the due filing for recordation of the Trust Indenture Supplement with respect to such Replacement Engine under the Act or such other applicable law of the jurisdiction other than the United
States in which the Aircraft is registered in accordance with Section 4.02(e), as the case may be, and the registration (which Owner shall have caused to be effected) with the International Registry of the sale to Owner of such Replacement
Engine (if occurring after February 28, 2006) and the International Interest granted under such Trust Indenture Supplement with respect to such Replacement Engine; and 

(iv) the Owner shall have furnished to Mortgagee a certificate of a qualified aircraft engineer (who may be an employee of Owner) certifying
that such Replacement Engine has a value and utility and remaining useful life (without regard to hours and cycles remaining until overhaul) at least equal to the Engine so replaced (assuming that such Engine had been maintained in accordance with
this Trust Indenture). 
 Upon satisfaction of all conditions to such substitution, (x) the Mortgagee shall execute and deliver to the Owner such
documents and instruments, prepared at the Owner’s expense, as the Owner shall reasonably request to evidence the release of such replaced Engine from the Lien of this Trust Indenture, (y) the Mortgagee shall assign to the Owner all claims
it may have against any other Person relating to any Event of Loss giving rise to such substitution and (z) the Owner shall receive all insurance proceeds (other than those reserved to others under Section 4.06(b)) and proceeds in respect
of any Event of Loss giving rise to such replacement to the extent not previously applied to the purchase price of the Replacement Engine as provided in Section 4.05(d). 

  
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 SECTION 4.05. Loss, Destruction or Requisition 

(a) Event of Loss With Respect to the Airframe. Upon the occurrence of an Event of Loss with respect to the Airframe, the Owner shall
promptly (and in any event within 15 days after such occurrence) give the Mortgagee written notice of such Event of Loss. The Owner shall, within 45 days after such occurrence, give the Mortgagee written notice of Owner’s election to either
replace the Airframe as provided under Section 4.05(a)(i) or to make payment in respect of such Event of Loss as provided under Section 4.05(a)(ii) (it being agreed that if Owner shall not have given the Mortgagee such notice of such
election within the above specified time period, the Owner shall be deemed to have elected to make payment in respect of such Event of Loss as provided under Section 4.05(a)(ii)): 

(i) if Owner elects to replace the Airframe, Owner shall, subject to the satisfaction of the conditions contained in Section 4.05(c), as
promptly as possible and in any event within 120 days after the occurrence of such Event of Loss, cause to be subjected to the Lien of this Trust Indenture, in replacement of the Airframe with respect to which the Event of Loss occurred, a
Replacement Airframe and, if any Engine shall have been installed on the Airframe when it suffered the Event of Loss, a Replacement Engine therefor, such Replacement Airframe and Replacement Engines to be free and clear of all Liens except Permitted
Liens and to have a value, utility and remaining useful life (without regard to hours or cycles remaining until the next regular maintenance check) at least equal to the Airframe or Engine, as the case may be, to be replaced thereby (assuming that
such Airframe or Engine had been maintained in accordance with this Trust Indenture); provided that if the Owner shall not perform its obligation to effect such replacement under this clause (i) during the 120-day period of time provided herein, it shall pay the amounts required to be paid pursuant to and within the time frame specified in clause (ii) below; or 

(ii) if Owner elects to make a payment in respect of such Event of Loss of the Airframe, Owner shall make a payment to the Mortgagee for
purposes of redeeming Equipment Notes in accordance with Section 2.10 hereof on a date on or before the Business Day next following the earlier of (x) the 120th day following the date of the occurrence of such Event of Loss, and
(y) the fourth Business Day following the receipt of insurance proceeds with respect to such Event of Loss (but in any event not earlier than the date of Owner’s election under Section 4.05(a) to make payment under this
Section 4.05 (a)(ii)); and upon such payment and payment of all other Secured Obligations then due and payable, the Mortgagee shall, at the cost and expense of the Owner, release from the Lien of this Trust Indenture the Airframe and the
Engines, by executing and delivering to the Owner all documents and instruments as the Owner may reasonably request to evidence such release. 

(b) Effect of Replacement. Should the Owner have provided a Replacement Airframe and Replacement Engines, if any, as provided for in
Section 4.05(a)(i), (i) the Lien of this Trust Indenture shall continue with respect to such Replacement Airframe and Replacement Engines, if any, as though no Event of Loss had occurred; (ii) the Mortgagee shall, at the cost and
expense of the Owner, release from the Lien of this Trust Indenture the replaced Airframe and Engines, if any, by executing and delivering to the Owner such documents and instruments as the Owner may reasonably request to evidence such release; and
(iii) in the case of a replacement upon an Event of Loss, the Mortgagee shall assign to the Owner all claims the 

  
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Mortgagee may have against any other Person arising from the Event of Loss and the Owner shall receive all insurance proceeds (other than those reserved to others under Section 4.06(b)) and
proceeds from any award in respect of condemnation, confiscation, seizure or requisition, including any investment interest thereon, to the extent not previously applied to the purchase price of the Replacement Airframe and Replacement Engines, if
any, as provided in Section 4.05(d). 
 (c) Conditions to Airframe and Engine Replacement. The Owner’s right to substitute
a Replacement Airframe and Replacement Engines, if any, as provided in Section 4.05(a)(i) shall be subject to the fulfillment, at the Owner’s sole cost and expense, in addition to the conditions contained in such Section 4.05(a)(i),
of the following conditions precedent: 
 (i) on the date when the Replacement Airframe and Replacement Engines, if any, is subjected to the
Lien of this Trust Indenture (such date being referred to in this Section 4.05 as the “Replacement Closing Date”), an executed counterpart of each of the following documents (or, in the case of the FAA Bill of Sale and full warranty
bill of sale referred to below, a photocopy thereof) shall have been delivered to the Mortgagee: 
 (A) a Trust Indenture
Supplement covering the Replacement Airframe and Replacement Engines, if any, which shall have been duly filed for recordation pursuant to the Act or such other applicable law of such jurisdiction other than the United States in which the
Replacement Airframe and Replacement Engines, if any, are to be registered in accordance with Section 4.02(e), as the case may be; 

(B) an FAA Bill of Sale (or a comparable document, if any, of another Aviation Authority, if applicable) covering the
Replacement Airframe, executed by the former owner thereof in favor of the Owner; 
 (C) a full warranty (as to title) bill
of sale, covering the Replacement Airframe and Replacement Engines, if any, executed by the former owner thereof in favor of the Owner (or, at the Owner’s option, other evidence of the Owner’s ownership of such Replacement Airframe and
Replacement Engines, if any, reasonably satisfactory to the Mortgagee); and 
 (D) UCC financing statements (or any similar
statements or other documents required to be filed or delivered pursuant to the laws of the jurisdiction in which the Replacement Airframe may be registered in accordance with Section 4.02(e)) as are deemed necessary or desirable by counsel for
the Mortgagee to protect the security interests of the Mortgagee in the Replacement Airframe and Replacement Engines, if any; 
 (ii) the
Replacement Airframe and Replacement Engines, if any, shall be of the same model as the Airframe or Engines, as the case may be, or an improved model of such aircraft or engines of the manufacturer thereof, shall have a value and utility (without
regard to hours or cycles remaining until the next regular maintenance check) at least equal to, and be in as good operating condition and repair as, the Airframe and any Engines replaced (assuming such Airframe and Engines had been maintained in
accordance with this Trust Indenture); 

  
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 (iii) the Mortgagee (acting directly or by authorization to its special counsel) shall have
received satisfactory evidence as to the compliance with Section 4.06 with respect to the Replacement Airframe and Replacement Engines, if any; 

(iv) on the Replacement Closing Date, (A) the Owner shall cause the Replacement Airframe and Replacement Engines, if any, to be subject
to the Lien of this Trust Indenture free and clear of Liens (other than Permitted Liens), (B) the Replacement Airframe shall have been duly certified by the FAA as to type and airworthiness in accordance with the terms of this Trust Indenture,
(C) application for registration of the Replacement Airframe in accordance with Section 4.02(e) shall have been duly made with the FAA or other applicable Aviation Authority and the Owner shall have authority to operate the Replacement
Airframe and (D) the Owner shall have caused the sale of such Replacement Airframe and Replacement Engine(s), if any, to the Owner (if occurring after February 28, 2006) and the International Interest granted under the Trust Indenture
Supplement in favor of the Mortgagee with respect to such Replacement Airframe and Replacement Engine(s), if any, each to be registered on the International Registry as a sale or an International Interest, respectively; 

(v) the Mortgagee, at the expense of the Owner, shall have received (acting directly or by authorization to its special counsel) (A) an
opinion of counsel, addressed to the Mortgagee, to the effect that the Replacement Airframe and Replacement Engine, if any, has or have duly been made subject to the Lien of this Trust Indenture, and Mortgagee will be entitled to the benefits of
Section 1110 with respect to the Replacement Airframe, provided that such opinion with respect to Section 1110 need not be delivered to the extent that immediately prior to such replacement the benefits of Section 1110 were not,
solely by reason of a change in law or court interpretation thereof, available to Mortgagee, and (B) an opinion of Owner’s aviation law counsel reasonably satisfactory to and addressed to Mortgagee as to the due registration of any such
Replacement Airframe and the due filing for recordation of each Trust Indenture Supplement with respect to such Replacement Airframe or Replacement Engine under the Act or such other applicable law of the jurisdiction other than the
United States in which the Replacement Airframe is to be registered in accordance with Section 4.02(e), as the case may be, and the registration with the International Registry of the sale of such Replacement Airframe and Replacement
Engine(s), if any, to the Owner (if occurring after February 28, 2006) and of the International Interest granted under the Trust Indenture Supplement with respect to such Replacement Aircraft and Replacement Engine(s), if any; and 

(vi) the Owner shall have furnished to the Mortgagee a certificate of a qualified aircraft engineer (who may be an employee of Owner)
certifying that the Replacement Airframe and Replacement Engines, if any, have a value and utility and remaining useful life (without regard to hours and cycles remaining until overhaul) at least equal to the Airframe and any Engines so replaced
(assuming that such Airframe and Engines had been maintained in accordance with this Trust Indenture). 
 (d) Non-Insurance Payments Received on Account of an Event of Loss. Any amounts, other than insurance proceeds in respect of damage or loss not constituting an Event of Loss (the application of which is provided for
in Annex B), received at any time by Mortgagee or Owner from any Government Entity or any other Person in respect of any Event of Loss will be applied as follows: 

  
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 (i) If such amounts are received with respect to the Airframe, and any Engine
installed thereon at the time of such Event of Loss, upon compliance by Owner with the applicable terms of Section 4.05(c) with respect to the Event of Loss for which such amounts are received, such amounts shall be paid over to, or retained
by, Owner; 
 (ii) If such amounts are received with respect to an Engine (other than an Engine installed on the Airframe at
the time such Airframe suffers an Event of Loss), upon compliance by Owner with the applicable terms of Section 4.04(e) with respect to the Event of Loss for which such amounts are received, such amounts shall be paid over to, or retained by,
Owner; 
 (iii) If such amounts are received, in whole or in part, with respect to the Airframe, and Owner makes, has made or
is deemed to have made the election set forth in Section 4.05(a)(ii), such amounts shall be applied as follows: 

first, if the sum described in Section 4.05(a)(ii) has not then been paid in full by Owner, such amounts shall be
paid to Mortgagee to the extent necessary to pay in full such sum; and 
 second, the remainder, if any, shall be
paid to Owner. 
 (e) Requisition for Use. In the event of a requisition for use by any Government Entity of the Airframe and the
Engines, if any, or engines installed on such Airframe while such Airframe is subject to the Lien of this Trust Indenture, the Owner shall promptly notify the Mortgagee of such requisition and all of the Owner’s obligations under this Trust
Indenture shall continue to the same extent as if such requisition had not occurred except to the extent that the performance or observance of any obligation by the Owner shall have been prevented or delayed by such requisition; provided
that the Owner’s obligations under this Section 4.05 with respect to the occurrence of an Event of Loss for the payment of money and under Section 4.06 (except while an assumption of liability by the U.S. Government of the
scope referred to in Section 4.02(c) is in effect) shall not be reduced or delayed by such requisition. Any payments received by the Mortgagee or the Owner or Permitted Lessee from such Government Entity with respect to such requisition of use
shall be paid over to, or retained by, the Owner. In the event of an Event of Loss of an Engine resulting from the requisition for use by a Government Entity of such Engine (but not the Airframe), the Owner will replace such Engine hereunder by
complying with the terms of Section 4.04(e) and any payments received by the Mortgagee or the Owner from such Government Entity with respect to such requisition shall be paid over to, or retained by, the Owner. 

  
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 (f) Certain Payments to be Held As Security. Any amount referred to in this
Section 4.05 or Section 4.06 which is payable or creditable to, or retainable by, the Owner shall not be paid or credited to, or retained by the Owner if at the time of such payment, credit or retention a Special Default or an Event of
Default shall have occurred and be continuing, but shall be paid to and held by the Mortgagee as security for the obligations of the Owner under this Trust Indenture and the Operative Agreements, and at such time as there shall not be continuing any
such Special Default or Event of Default such amount and any gain realized as a result of investments required to be made pursuant to Section 6.06 shall to the extent not theretofore applied as provided herein, be paid over to the Owner. 

SECTION 4.06. Insurance 

(a) Owner’s Obligation to Insure. Owner shall comply with, or cause to be complied with, each of the provisions of Annex B,
which provisions are hereby incorporated by this reference as if set forth in full herein. 
 (b) Insurance for Own Account. Nothing
in Section 4.06 shall limit or prohibit (a) Owner from maintaining the policies of insurance required under Annex B with higher limits than those specified in Annex B, or (b) Mortgagee from obtaining insurance for its own account (and
any proceeds payable under such separate insurance shall be payable as provided in the policy relating thereto); provided, however, that no insurance may be obtained or maintained that would limit or otherwise adversely affect the
coverage of any insurance required to be obtained or maintained by Owner pursuant to this Section 4.06 and Annex B. 
 (c)
Indemnification by Government in Lieu of Insurance. Mortgagee agrees to accept, in lieu of insurance against any risk with respect to the Aircraft described in Annex B, indemnification from, or insurance provided by, the U.S. Government, or
upon the written consent of Mortgagee, other Government Entity, against such risk in an amount that, when added to the amount of insurance (including permitted self-insurance), if any, against such risk that Owner (or any Permitted Lessee) may
continue to maintain, in accordance with this Section 4.06, during the period of such requisition or transfer, shall be at least equal to the amount of insurance against such risk otherwise required by this Section 4.06; provided
that the provisions of Section D of Annex B shall not apply to an indemnity or insurance provided by the U.S. Government in lieu of insurance required by Section C of Annex B, except to the extent the U.S. Government makes such provisions
generally available to covered airlines. 
 (d) Application of Insurance Proceeds. As between Owner and Mortgagee, all insurance
proceeds received as a result of the occurrence of an Event of Loss with respect to the Aircraft or any Engine under policies required to be maintained by Owner pursuant to this Section 4.06 will be applied in accordance with
Section 4.05(d). All proceeds of insurance required to be maintained by Owner, in accordance with Section 4.06 and Section B of Annex B, in respect of any property damage or loss not constituting an Event of Loss with respect to
the Aircraft, Airframe or any Engine will be applied in payment (or to reimburse Owner) for repairs or for replacement property, and any balance remaining after such repairs or replacement with respect to such damage or loss shall be paid over to,
or retained by, Owner. 
 SECTION 4.07. Merger of Owner 

(a) In General. Owner shall not consolidate with or merge into any other person under circumstances in which Owner is not the surviving
corporation, or convey, transfer or lease in one or more transactions all or substantially all of its assets to any other person, unless: 

  
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 (i) such person is organized, existing and in good standing under the Laws of the United States,
any State of the United States or the District of Columbia and, upon consummation of such transaction, such person will be a U.S. Air Carrier; 

(ii) such person executes and delivers to Mortgagee a duly authorized, legal, valid, binding and enforceable agreement, reasonably
satisfactory in form and substance to Mortgagee, containing an effective assumption by such person of the due and punctual performance and observance of each covenant, agreement and condition in the Operative Agreements to be performed or observed
by Owner; 
 (iii) if the Aircraft is, at the time, registered with the FAA, such person makes such filings and recordings with the FAA
pursuant to the Act or if the Aircraft is, at the time, not registered with FAA, such person makes such filings and recordings with the applicable Aviation Authority as shall be necessary to evidence such consolidation or merger; 

(iv) such person makes such registrations with the International Registry as shall be permitted to evidence such consolidation or merger; and

 (v) immediately after giving effect to such consolidation or merger no Event of Default shall have occurred and be continuing. 

(b) Effect of Merger. Upon any such consolidation or merger of Owner with or into, or the conveyance, transfer or lease by Owner of all
or substantially all of its assets to, any Person in accordance with this Section 4.07, such Person will succeed to, and be substituted for, and may exercise every right and power of, Owner under the Operative Agreements with the same effect as
if such person had been named as “Owner” therein. No such consolidation or merger, or conveyance, transfer or lease, shall have the effect of releasing Owner or such Person from any of the obligations, liabilities, covenants or
undertakings of Owner under this Trust Indenture. 
 ARTICLE V 

EVENTS OF DEFAULT; REMEDIES OF MORTGAGEE 

SECTION 5.01. Event of Default 

“Event of Default” means any of the following events (whatever the reason for such Event of Default and whether such event shall be
voluntary or involuntary or come about or be effected by operation of Law or pursuant to or in compliance with any judgment, decree or order of any court or any order, rule or regulation of any administrative or governmental body): 

(i) the failure of the Owner to pay (i) principal of, interest on or Make-Whole Amount, if any, under any Equipment Note when due, and
such failure shall continue unremedied for a period of 10 Business Days, or (ii) any other amount payable by it to the Note Holders under this Trust Indenture or the Participation Agreement when due, and such failure shall continue for a period
in excess of 10 Business Days after Owner has received written notice from Mortgagee of the failure to make such payment when due; 

  
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 (ii) Owner shall fail to carry and maintain, or cause to be carried and maintained, insurance on
and in respect of the Aircraft, Airframe and Engines in accordance with the provisions of Section 4.06; 
 (iii) Owner shall fail to
observe or perform (or caused to be observed and performed) in any material respect any other covenant, agreement or obligation set forth herein or in any other Operative Agreement to which Owner is a party and such failure shall continue unremedied
for a period of 30 days from and after the date of written notice thereof to Owner from Mortgagee, unless such failure is capable of being corrected and Owner shall be diligently proceeding to correct such failure, in which case there shall be no
Event of Default unless and until such failure shall continue unremedied for a period of 270 days after receipt of such notice; 
 (iv)
any representation or warranty made by Owner herein, in the Participation Agreement or in any other Operative Agreement to which Owner is a party (a) shall prove to have been untrue or inaccurate in any material respect as of the date made,
(b) such untrue or inaccurate representation or warranty is material at the time in question, (c) and the same shall remain uncured (to the extent of the adverse impact of such incorrectness on the interest of the Mortgagee) for a period
in excess of 30 days from and after the date of written notice thereof from Mortgagee to Owner; 
 (v) the Owner shall consent to the
appointment of or taking possession by a receiver, trustee or liquidator of itself or of a substantial part of its property, or the Owner shall admit in writing its inability to pay its debts generally as they come due or shall make a general
assignment for the benefit of its creditors, or the Owner shall file a voluntary petition in bankruptcy or a voluntary petition or an answer seeking reorganization, liquidation or other relief under any bankruptcy laws or insolvency laws (as in
effect at such time), or an answer admitting the material allegations of a petition filed against it in any such case, or the Owner shall seek relief by voluntary petition, answer or consent, under the provisions of any other bankruptcy or similar
law providing for the reorganization or winding-up of corporations (as in effect at such time), or the Owner shall seek an agreement, composition, extension or adjustment with its creditors under such laws or
the Owner’s board of directors shall adopt a resolution authorizing corporate action in furtherance of any of the foregoing; 
 (vi) an
order, judgment or decree shall be entered by any court of competent jurisdiction appointing, without the consent of the Owner, a receiver, trustee or liquidator of the Owner or of any substantial part of its property, or any substantial part of the
property of the Owner shall be sequestered, or granting any other relief in respect of the Owner as a debtor under any bankruptcy laws or other insolvency laws (as in effect at such time), and any such order, judgment, decree, or decree of
appointment or sequestration shall remain in force undismissed, unstayed or unvacated for a period of 90 days after the date of entry thereof; 

  
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 (vii) a petition against the Owner in a proceeding under any bankruptcy laws or other insolvency
laws (as in effect at such time) is filed and not withdrawn or dismissed within 90 days thereafter, or if, under the provisions of any law providing for reorganization or winding-up of corporations which may
apply to the Owner, any court of competent jurisdiction shall assume jurisdiction, custody or control of the Owner of any substantial part of its property and such jurisdiction, custody or control shall remain in force unrelinquished, unstayed or
unterminated for a period of 90 days; or 
 (viii) the occurrence of a Related Indenture Event of Default. 

SECTION 5.02. Remedies 

(a) If an Event of Default shall have occurred and be continuing and so long as the same shall continue unremedied, then and in every such
case the Mortgagee may exercise any or all of the rights and powers and pursue any and all of the remedies pursuant to this Article V and shall have and may exercise all of the rights and remedies of a secured party under the Uniform Commercial Code
or of a chargee under the Cape Town Treaty and may take possession of all or any part of the properties covered or intended to be covered by the Lien created hereby or pursuant hereto and may exclude the Owner and all persons claiming under it
wholly or partly therefrom; provided that the Mortgagee shall give the Owner twenty days’ prior written notice of its intention to sell the Aircraft. Without limiting any of the foregoing, it is understood and agreed that the
Mortgagee may exercise any right of sale of the Aircraft available to it, even though it shall not have taken possession of the Aircraft and shall not have possession thereof at the time of such sale. 

(b) If an Event of Default shall have occurred and be continuing, then and in every such case the Mortgagee may (and shall, upon receipt of a
written demand therefor from a Majority in Interest of Note Holders), at any time, by delivery of written notice or notices to the Owner, declare all the Equipment Notes to be due and payable, whereupon the unpaid Original Amount of all Equipment
Notes then outstanding, together with accrued but unpaid interest thereon (without Make-Whole Amount) and other amounts due thereunder or otherwise payable hereunder, shall immediately become due and payable without presentment, demand, protest or
notice, all of which are hereby waived; provided that if an Event of Default referred to in clause (v), (vi) or (vii) of Section 5.01 hereof shall have occurred, then and in every such case the unpaid Original Amount then
outstanding, together with accrued but unpaid interest (without Make-Whole Amount) and all other amounts due hereunder and under the Equipment Notes shall immediately and without further act become due and payable without presentment, demand,
protest or notice, all of which are hereby waived. 
 This Section 5.02(b), however, is subject to the condition that, if at any time
after the Original Amount of the Equipment Notes shall have become so due and payable, and before any judgment or decree for the payment of the money so due, or any thereof, shall be entered, all overdue payments of interest upon the Equipment Notes
and all other amounts payable hereunder or under the Equipment Notes (except the Original Amount of the Equipment Notes and any Make-Whole Amount which by such declaration shall have become payable) shall have been duly paid, and every other Default
and Event of Default with respect to any covenant or provision of this Trust Indenture shall have been cured, then and in every such case a Majority in Interest of Note Holders may (but shall not be obligated to), by written instrument filed with
the Mortgagee, rescind and annul the Mortgagee’s declaration (or such automatic acceleration) and its consequences; but no such rescission or annulment shall extend to or affect any subsequent Default or Event of Default or impair any right
consequent thereon. 

  
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 (c) The Note Holders shall be entitled, at any sale pursuant to this Section 5.02, to
credit against any purchase price bid at such sale by such holder all or any part of the unpaid obligations owing to such Note Holder and secured by the Lien of this Trust Indenture (only to the extent that such purchase price would have been paid
to such Note Holder pursuant to Article III hereof if such purchase price were paid in cash and the foregoing provisions of this subsection (c) were not given effect). 

(d) In the event of any sale of the Collateral, or any part thereof, pursuant to any judgment or decree of any court or otherwise in
connection with the enforcement of any of the terms of this Trust Indenture, the unpaid Original Amount of all Equipment Notes then outstanding, together with accrued interest thereon (without Make-Whole Amount), and other amounts due thereunder,
shall immediately become due and payable without presentment, demand, protest or notice, all of which are hereby waived. 
 (e)
Notwithstanding anything contained herein, so long as the Pass Through Trustee under any Pass Through Trust Agreement (or its designee) is a Note Holder, the Mortgagee will not be authorized or empowered to acquire title to any Collateral or take
any action with respect to any Collateral so acquired by it if such acquisition or action would cause any Trust to fail to qualify as a “grantor trust” for federal income tax purposes. 

SECTION 5.03. Return of Aircraft, Etc. 

(a) If an Event of Default shall have occurred and be continuing and the Equipment Notes have been accelerated, at the request of the
Mortgagee, the Owner shall promptly execute and deliver to the Mortgagee such instruments of title and other documents as the Mortgagee may deem necessary or advisable to enable the Mortgagee or an agent or representative designated by the
Mortgagee, at such time or times and place or places as the Mortgagee may specify, to obtain possession of all or any part of the Collateral to which the Mortgagee shall at the time be entitled hereunder. If the Owner shall for any reason fail to
execute and deliver such instruments and documents after such request by the Mortgagee, the Mortgagee may (i) obtain a judgment conferring on the Mortgagee the right to immediate possession and requiring the Owner to execute and deliver such
instruments and documents to the Mortgagee, to the entry of which judgment the Owner hereby specifically consents to the fullest extent permitted by Law, and (ii) pursue all or part of such Collateral wherever it may be found and may enter any
of the premises of Owner wherever such Collateral may be or be supposed to be and search for such Collateral and take possession of and remove such Collateral. All expenses of obtaining such judgment or of pursuing, searching for and taking such
property shall, until paid, be secured by the Lien of this Trust Indenture. 
 (b) Upon every such taking of possession, the Mortgagee may,
from time to time, at the expense of the Collateral, make all such expenditures for maintenance, use, operation, storage, insurance, leasing, control, management, disposition, modifications or alterations to and of the Collateral, as it may deem
proper. In each such case, the Mortgagee shall have the right to maintain, use, operate, store, insure, lease, control, manage, dispose of, 

  
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modify or alter the Collateral and to exercise all rights and powers of the Owner relating to the Collateral, as the Mortgagee shall deem best, including the right to enter into any and all such
agreements with respect to the maintenance, use, operation, storage, insurance, leasing, control, management, disposition, modification or alteration of the Collateral or any part thereof as the Mortgagee may determine, and the Mortgagee shall be
entitled to collect and receive directly all rents, revenues and other proceeds of the Collateral and every part thereof, without prejudice, however, to the right of the Mortgagee under any provision of this Trust Indenture to collect and receive
all cash held by, or required to be deposited with, the Mortgagee hereunder. Such rents, revenues and other proceeds shall be applied to pay the expenses of the maintenance, use, operation, storage, insurance, leasing, control, management,
disposition, improvement, modification or alteration of the Collateral and of conducting the business thereof, and to make all payments which the Mortgagee may be required or may elect to make, if any, for taxes, assessments, insurance or other
proper charges upon the Collateral or any part thereof (including the employment of engineers and accountants to examine, inspect and make reports upon the properties and books and records of the Owner), and all other payments which the Mortgagee
may be required or authorized to make under any provision of this Trust Indenture, as well as just and reasonable compensation for the services of the Mortgagee, and of all persons properly engaged and employed by the Mortgagee with respect hereto.

 SECTION 5.04. Remedies Cumulative 

Each and every right, power and remedy given to the Mortgagee specifically or otherwise in this Trust Indenture shall be cumulative and shall
be in addition to every other right, power and remedy herein specifically given or now or hereafter existing at Law, in equity or by statute, and each and every right, power and remedy whether specifically herein given or otherwise existing may be
exercised from time to time and as often and in such order as may be deemed expedient by the Mortgagee, and the exercise or the beginning of the exercise of any power or remedy shall not be construed to be a waiver of the right to exercise at the
same time or thereafter any other right, power or remedy. No delay or omission by the Mortgagee in the exercise of any right, remedy or power or in the pursuance of any remedy shall impair any such right, power or remedy or be construed to be a
waiver of any default on the part of the Owner or to be an acquiescence therein. 
 SECTION 5.05. Discontinuance of Proceedings

 In case the Mortgagee shall have instituted any proceeding to enforce any right, power or remedy under this Trust Indenture by
foreclosure, entry or otherwise, and such proceedings shall have been discontinued or abandoned for any reason or shall have been determined adversely to the Mortgagee, then and in every such case the Owner and the Mortgagee shall, subject to any
determination in such proceedings, be restored to their former positions and rights hereunder with respect to the Collateral, and all rights, remedies and powers of the Owner or the Mortgagee shall continue as if no such proceedings had been
instituted. 

  
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 SECTION 5.06. Waiver of Past Defaults 

Upon written instruction from a Majority in Interest of Note Holders, the Mortgagee shall waive any past Default hereunder and its consequences
and upon any such waiver such Default shall cease to exist and any Event of Default arising therefrom shall be deemed to have been cured for every purpose of this Trust Indenture, but no such waiver shall extend to any subsequent or other Default or
impair any right consequent thereon; provided that in the absence of written instructions from all the Note Holders, the Mortgagee shall not waive any Default (i) in the payment of the Original Amount, Make-Whole Amount, if any,
and interest and other amounts due under any Equipment Note then outstanding, or (ii) in respect of a covenant or provision hereof which, under Article X hereof, cannot be modified or amended without the consent of each Note Holder. 

SECTION 5.07. Appointment of Receiver 

The Mortgagee shall, as a matter of right, be entitled to the appointment of a receiver (who may be the Mortgagee or any successor or nominee
thereof) for all or any part of the Collateral, whether such receivership be incidental to a proposed sale of the Collateral or the taking of possession thereof or otherwise, and the Owner hereby consents to the appointment of such a receiver and
will not oppose any such appointment. Any receiver appointed for all or any part of the Collateral shall be entitled to exercise all the rights and powers of the Mortgagee with respect to the Collateral. 

SECTION 5.08. Mortgagee Authorized to Execute Bills of Sale, Etc. 

The Owner irrevocably appoints, while an Event of Default has occurred and is continuing, the Mortgagee the true and lawful attorney-in-fact of the Owner (which appointment is coupled with an interest) in its name and stead and on its behalf, for the purpose of effectuating any sale, assignment,
transfer or delivery for the enforcement of the Lien of this Trust Indenture, whether pursuant to foreclosure or power of sale, assignments and other instruments as may be necessary or appropriate, with full power of substitution, the Owner hereby
ratifying and confirming all that such attorney or any substitute shall do by virtue hereof in accordance with applicable law. Nevertheless, if so requested by the Mortgagee or any purchaser, the Owner shall ratify and confirm any such sale,
assignment, transfer or delivery, by executing and delivering to the Mortgagee or such purchaser all bills of sale, assignments, releases and other proper instruments to effect such ratification and confirmation as may be designated in any such
request. 
 SECTION 5.09. Rights of Note Holders to Receive Payment 

Notwithstanding any other provision of this Trust Indenture, the right of any Note Holder to receive payment of principal of, and premium, if
any, and interest on an Equipment Note on or after the respective due dates expressed in such Equipment Note, or to bring suit for the enforcement of any such payment on or after such respective dates in accordance with the terms hereof, shall not
be impaired or affected without the consent of such Note Holder. 

  
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 ARTICLE VI 

DUTIES OF THE MORTGAGEE 

SECTION 6.01. Notice of Event of Default 

If the Mortgagee shall have Actual Knowledge of an Event of Default or of a Default arising from a failure to pay any installment of principal
and interest on any Equipment Note, the Mortgagee shall give prompt written notice thereof to each Note Holder. Subject to the terms of Sections 5.06, 6.02 and 6.03 hereof, the Mortgagee shall take such action, or refrain from taking such action,
with respect to such Event of Default or Default (including with respect to the exercise of any rights or remedies hereunder) as the Mortgagee shall be instructed in writing by a Majority in Interest of Note Holders. Subject to the provisions of
Section 6.03, if the Mortgagee shall not have received instructions as above provided within 20 days after mailing notice of such Event of Default to the Note Holders, the Mortgagee may, subject to instructions thereafter received pursuant to
the preceding provisions of this Section 6.01, take such action, or refrain from taking such action, but shall be under no duty to take or refrain from taking any action, with respect to such Event of Default or Default as it shall determine
advisable in the best interests of the Note Holders; provided, however, that the Mortgagee may not sell the Aircraft or any Engine without the consent of a Majority in Interest of Note Holders. For all purposes of this Trust Indenture,
in the absence of Actual Knowledge on the part of the Mortgagee, the Mortgagee shall not be deemed to have knowledge of a Default or an Event of Default (except, the failure of Owner to pay any installment of principal or interest within one
Business Day after the same shall become due, which failure shall constitute knowledge of a Default) unless notified in writing by the Owner or one or more Note Holders. 

SECTION 6.02. Action Upon Instructions; Certain Rights and Limitations 

Subject to the terms of Sections 5.02(a), 5.06, 6.01 and 6.03 hereof, upon the written instructions at any time and from time to time of a
Majority in Interest of Note Holders, the Mortgagee shall, subject to the terms of this Section 6.02, take such of the following actions as may be specified in such instructions: (i) give such notice or direction or exercise such right,
remedy or power hereunder as shall be specified in such instructions and (ii) give such notice or direction or exercise such right, remedy or power hereunder with respect to any part of the Collateral as shall be specified in such instructions;
it being understood that without the written instructions of a Majority in Interest of Note Holders, the Mortgagee shall not, except as provided in Section 6.01, approve any such matter as satisfactory to the Mortgagee. 

The Mortgagee will execute and the Owner will file such continuation statements with respect to financing statements relating to the security
interest created hereunder in the Collateral as may be specified from time to time in written instructions of a Majority in Interest of Note Holders (which instructions shall be accompanied by the form of such continuation statement so to be filed).
The Mortgagee will furnish to each Note Holder, promptly upon receipt thereof, duplicates or copies of all reports, notices, requests, demands, certificates and other instruments furnished to the Mortgagee hereunder. 

  
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 SECTION 6.03. Indemnification 

The Mortgagee shall not be required to take any action or refrain from taking any action under Section 6.01 (other than the first sentence
thereof), 6.02 or Article V hereof unless the Mortgagee shall have been indemnified to its reasonable satisfaction against any liability, cost or expense (including counsel fees) which may be incurred in connection therewith pursuant to a written
agreement with one or more Note Holders. The Mortgagee agrees that it shall look solely to the Note Holders for the satisfaction of any indemnity (except expenses for foreclosure of the type referred to in clause “First” of
Section 3.03 hereof) owed to it pursuant to this Section 6.03. The Mortgagee shall not be under any obligation to take any action under this Trust Indenture or any other Operative Agreement and nothing herein or therein shall require the
Mortgagee to expend or risk its own funds or otherwise incur the risk of any financial liability in the performance of any of its rights or powers if it shall have reasonable grounds for believing that repayment of such funds or adequate indemnity
against such risk or liability is not reasonably assured to it (the written indemnity of any Note Holder who is a QIB, signed by an authorized officer thereof, in favor of, delivered to and in form reasonably satisfactory to the Mortgagee shall be
accepted as reasonable assurance of adequate indemnity). The Mortgagee shall not be required to take any action under Section 6.01 (other than the first sentence thereof) or 6.02 or Article V hereof, nor shall any other provision of this Trust
Indenture or any other Operative Agreement be deemed to impose a duty on the Mortgagee to take any action, if the Mortgagee shall have been advised by counsel that such action is contrary to the terms hereof or is otherwise contrary to Law. 

SECTION 6.04. No Duties Except as Specified in Trust Indenture or Instructions 

The Mortgagee shall not have any duty or obligation to use, operate, store, lease, control, manage, sell, dispose of or otherwise deal with the
Aircraft or any other part of the Collateral, or to otherwise take or refrain from taking any action under, or in connection with, this Trust Indenture or any part of the Collateral, except as expressly provided by the terms of this Trust Indenture
or as expressly provided in written instructions from Note Holders as provided in this Trust Indenture; and no implied duties or obligations shall be read into this Trust Indenture against the Mortgagee. The Mortgagee agrees that it will in its
individual capacity and at its own cost and expense (but without any right of indemnity in respect of any such cost or expense under Section 8.01 hereof), promptly take such action as may be necessary duly to discharge all liens and
encumbrances on any part of the Collateral which result from claims against it in its individual capacity not related to the administration of the Collateral or any other transaction pursuant to this Trust Indenture or any document included in the
Collateral. 
 SECTION 6.05. No Action Except Under Trust Indenture or Instructions 

The Mortgagee will not use, operate, store, lease, control, manage, sell, dispose of or otherwise deal with the Aircraft or any other part of
the Collateral except in accordance with the powers granted to, or the authority conferred upon the Mortgagee pursuant to this Trust Indenture and in accordance with the express terms hereof. 

  
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 SECTION 6.06. Investment of Amounts Held by Mortgagee 

Any amounts held by the Mortgagee pursuant to Section 3.02, 3.03 or 3.07 or pursuant to any provision of any other Operative Agreement
providing for amounts to be held by the Mortgagee which are not distributed pursuant to the other provisions of Article III hereof shall be invested by the Mortgagee from time to time in Cash Equivalents as directed by the Owner so long as the
Mortgagee may acquire the same using its best efforts. All Cash Equivalents held by the Mortgagee pursuant to this Section 6.06 shall either be (a) registered in the name of, payable to the order of, or specially endorsed to, the
Mortgagee, or (b) held in an Eligible Account. Unless otherwise expressly provided in this Trust Indenture, any income realized as a result of any such investment, net of the Mortgagee’s reasonable fees and expenses in making such
investment, shall be held and applied by the Mortgagee, in the same manner as the principal amount of such investment is to be applied and any losses, net of earnings and such reasonable fees and expenses, shall be charged against the principal
amount invested. The Mortgagee shall not be liable for any loss resulting from any investment required to be made by it under this Trust Indenture other than by reason of its willful misconduct or gross negligence or negligence in the handling of
funds, and any such investment may be sold (without regard to its maturity) by the Mortgagee without instructions whenever such sale is necessary to make a distribution required by this Trust Indenture. 

ARTICLE VII 
 THE
MORTGAGEE 
 SECTION 7.01. Acceptance of Trusts and Duties 

The Mortgagee accepts the duties hereby created and applicable to it and agrees to perform the same but only upon the terms of this Trust
Indenture and agrees to receive and disburse all monies constituting part of the Collateral in accordance with the terms hereof. The Mortgagee, in its individual capacity, shall not be answerable or accountable under any circumstances, except
(i) for its own willful misconduct or gross negligence (other than for the handling of funds, for which the standard of accountability shall be willful misconduct or negligence), (ii) as provided in the fourth sentence of Section 2.04(a)
hereof and the last sentence of Section 6.04 hereof, and (iii) from the inaccuracy of any representation or warranty of the Mortgagee (in its individual capacity) in the Participation Agreement or expressly made hereunder. 

SECTION 7.02. Absence of Duties 

Except in accordance with written instructions furnished pursuant to Section 6.01 or 6.02 hereof, and except as provided in, and without
limiting the generality of, Sections 6.03, 6.04 and 7.07 hereof the Mortgagee shall have no duty (i) to see to any registration of the Aircraft or any recording or filing of this Trust Indenture or any other document, or to see to the
maintenance of any such registration, recording or filing, (ii) to see to any insurance on the Aircraft or to effect or maintain any such insurance, whether or not Owner shall be in default with respect thereto, (iii) to see to the payment
or discharge of any lien or encumbrance of any kind against any part of the Collateral, (iv) to confirm, verify or inquire into the failure to receive any financial statements from Owner, or (v) to inspect the Aircraft at any time or
ascertain or inquire as to the performance or observance of any of Owner’s covenants herein or any Permitted Lessee’s covenants under any assigned Permitted Lease with respect to the Aircraft. 

  
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 SECTION 7.03. No Representations or Warranties as to Aircraft or Documents 

THE MORTGAGEE IN ITS INDIVIDUAL OR TRUST CAPACITY DOES NOT MAKE AND SHALL NOT BE DEEMED TO HAVE MADE AND HEREBY EXPRESSLY DISCLAIMS ANY
REPRESENTATION OR WARRANTY, EXPRESS OR IMPLIED, AS TO THE TITLE, AIRWORTHINESS, VALUE, COMPLIANCE WITH SPECIFICATIONS, CONDITION, DESIGN, QUALITY, DURABILITY, OPERATION, MERCHANTABILITY OR FITNESS FOR USE FOR A PARTICULAR PURPOSE OF THE AIRCRAFT OR
ANY ENGINE, AS TO THE ABSENCE OF LATENT OR OTHER DEFECTS, WHETHER OR NOT DISCOVERABLE, AS TO THE ABSENCE OF ANY INFRINGEMENT OF ANY PATENT, TRADEMARK OR COPYRIGHT, AS TO THE ABSENCE OF OBLIGATIONS BASED ON STRICT LIABILITY IN TORT OR ANY OTHER
REPRESENTATION OR WARRANTY WHATSOEVER. The Mortgagee, in its individual or trust capacities, does not make or shall not be deemed to have made any representation or warranty as to the validity, legality or enforceability of this Trust Indenture, the
Participation Agreement, the Equipment Notes, or the Purchase Agreement, or as to the correctness of any statement contained in any thereof, except for the representations and warranties of the Owner made in its individual capacity and the
representations and warranties of the Mortgagee in its individual capacity, in each case expressly made in this Trust Indenture or in the Participation Agreement. The Note Holders make no representation or warranty hereunder whatsoever. 

SECTION 7.04. No Segregation of Monies; No Interest 

Except as otherwise provided in Section 3.07 hereof, any monies paid to or retained by the Mortgagee pursuant to any provision hereof and
not then required to be distributed to the Note Holders, or the Owner as provided in Article III hereof need not be segregated in any manner except to the extent required by Law or Section 6.06 hereof, and may be deposited under such general
conditions as may be prescribed by Law, and the Mortgagee shall not be liable for any interest thereon (except that the Mortgagee shall invest all monies held as directed by Owner so long as no Event of Default has occurred and is continuing (or in
the absence of such direction, by the Majority In Interest of Note Holders) in Cash Equivalents); provided, however, that any payments received, or applied hereunder, by the Mortgagee shall be accounted for by the Mortgagee so that any
portion thereof paid or applied pursuant hereto shall be identifiable as to the source thereof. 
 SECTION 7.05. Reliance;
Agreements; Advice of Counsel 
 The Mortgagee shall not incur any liability to anyone in acting upon any signature, instrument, notice,
resolution, request, consent, order, certificate, report, opinion, bond or other document or paper believed by it to be genuine and believed by it to be signed by the proper party or parties. The Mortgagee may accept a copy of a resolution of the
Board of 

  
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Directors (or Executive Committee thereof) of the Owner, certified by the Secretary or an Assistant Secretary thereof as duly adopted and in full force and effect, as conclusive evidence that
such resolution has been duly adopted and that the same is in full force and effect. As to the aggregate unpaid Original Amount of Equipment Notes outstanding as of any date, the Owner may for all purposes hereof rely on a certificate signed by any
Vice President or other authorized corporate trust officer of the Mortgagee. As to any fact or matter relating to the Owner the manner of the ascertainment of which is not specifically described herein, the Mortgagee may for all purposes hereof rely
on a certificate, signed by a duly authorized officer of the Owner, as to such fact or matter, and such certificate shall constitute full protection to the Mortgagee for any action taken or omitted to be taken by it in good faith in reliance
thereon. In the administration of the trusts hereunder, the Mortgagee may execute any of the trusts or powers hereof and perform its powers and duties hereunder directly or through agents or attorneys and may, at the expense of the Collateral,
advise with counsel, accountants and other skilled persons to be selected and retained by it, and the Mortgagee shall not be liable for anything done, suffered or omitted in good faith by it in accordance with the written advice or written opinion
of any such counsel, accountants or other skilled persons. 
 SECTION 7.06. Compensation 

The Mortgagee shall be entitled to reasonable compensation, including expenses and disbursements (including the reasonable fees and expenses of
counsel), for all services rendered hereunder and shall, on and subsequent to an Event of Default hereunder, have a priority claim on the Collateral for the payment of such compensation, to the extent that such compensation shall not be paid by
Owner, and shall have the right, on and subsequent to an Event of Default hereunder, to use or apply any monies held by it hereunder in the Collateral toward such payments. The Mortgagee agrees that it shall have no right against the Note Holders
for any fee as compensation for its services as trustee under this Trust Indenture. 
 SECTION 7.07. Instructions from Note Holders

 In the administration of the trusts created hereunder, the Mortgagee shall have the right to seek instructions from a Majority in
Interest of Note Holders should any provision of this Trust Indenture appear to conflict with any other provision herein or should the Mortgagee’s duties or obligations hereunder be unclear, and the Mortgagee shall incur no liability in
refraining from acting until it receives such instructions. The Mortgagee shall be fully protected for acting in accordance with any instructions received under this Section 7.07. 

ARTICLE VIII 

INDEMNIFICATION 

SECTION 8.01. Scope of Indemnification 

The Mortgagee shall be indemnified by the Owner to the extent and in the manner provided in Section 8 of the Participation Agreement. 

  
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 ARTICLE IX 

SUCCESSOR AND SEPARATE TRUSTEES 

SECTION 9.01. Resignation of Mortgagee; Appointment of Successor 

(a) The Mortgagee or any successor thereto may resign at any time without cause by giving at least 30 days’ prior written notice to the
Owner and each Note Holder, such resignation to be effective upon the acceptance of the trusteeship by a successor Mortgagee. In addition, a Majority in Interest of Note Holders may at any time (but only with the consent of Owner, which consent
shall not be unreasonably withheld, except that such consent shall not be necessary if an Event of Default is continuing) remove the Mortgagee without cause by an instrument in writing delivered to the Owner and the Mortgagee, and the Mortgagee
shall promptly notify each Note Holder thereof in writing, such removal to be effective upon the acceptance of the trusteeship by a successor Mortgagee. In the case of the resignation or removal of the Mortgagee, a Majority in Interest of Note
Holders may appoint a successor Mortgagee by an instrument signed by such holders, which successor, so long as no Event of Default shall have occurred and be continuing, shall be subject to Owner’s reasonable approval. If a successor Mortgagee
shall not have been appointed within 30 days after such notice of resignation or removal, the Mortgagee, the Owner or any Note Holder may apply to any court of competent jurisdiction to appoint a successor Mortgagee to act until such time, if any,
as a successor shall have been appointed as above provided. The successor Mortgagee so appointed by such court shall immediately and without further act be superseded by any successor Mortgagee appointed as above provided. 

(b) Any successor Mortgagee, however appointed, shall execute and deliver to the Owner and the predecessor Mortgagee an instrument accepting
such appointment and assuming the obligations of the Mortgagee arising from and after the time of such appointment, and thereupon such successor Mortgagee, without further act, shall become vested with all the estates, properties, rights, powers and
duties of the predecessor Mortgagee hereunder in the trust hereunder applicable to it with like effect as if originally named the Mortgagee herein; but nevertheless upon the written request of such successor Mortgagee, such predecessor Mortgagee
shall execute and deliver an instrument transferring to such successor Mortgagee, upon the trusts herein expressed applicable to it, all the estates, properties, rights and powers of such predecessor Mortgagee, and such predecessor Mortgagee shall
duly assign, transfer, deliver and pay over to such successor Mortgagee all monies or other property then held by such predecessor Mortgagee hereunder. 

(c) Any successor Mortgagee, however appointed, shall be a bank or trust company having its principal place of business in the Borough of
Manhattan, City and State of New York; Chicago, Illinois; Hartford, Connecticut; Wilmington, Delaware; or Boston, Massachusetts and having (or whose obligations under the Operative Agreements are guaranteed by an affiliated entity having) a combined
capital and surplus of at least $100,000,000, if there be such an institution willing, able and legally qualified to perform the duties of the Mortgagee hereunder upon reasonable or customary terms. 

  
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 (d) Any corporation into which the Mortgagee may be merged or converted or with which it may be
consolidated, or any corporation resulting from any merger, conversion or consolidation to which the Mortgagee shall be a party, or any corporation to which substantially all the corporate trust business of the Mortgagee may be transferred, shall,
subject to the terms of paragraph (c) of this Section 9.01, be a successor Mortgagee and the Mortgagee under this Trust Indenture without further act. 

(e) The Owner consents to any change in the identity of the Mortgagee on the International Registry occasioned by provisions of this
Section 9.01, and if required by the International Registry to reflect such change, will provide its consent thereto. 
 SECTION
9.02. Appointment of Additional and Separate Trustees 
 (a) Whenever (i) the Mortgagee shall deem it necessary or desirable
in order to conform to any Law of any jurisdiction in which all or any part of the Collateral shall be situated or to make any claim or bring any suit with respect to or in connection with the Collateral, this Trust Indenture, any other Indenture
Agreement, the Equipment Notes or any of the transactions contemplated by the Participation Agreement, (ii) the Mortgagee shall be advised by counsel satisfactory to it that it is so necessary or prudent in the interests of the Note Holders
(and the Mortgagee shall so advise the Owner), or (iii) the Mortgagee shall have been requested to do so by a Majority in Interest of Note Holders, then in any such case, the Mortgagee and, upon the written request of the Mortgagee, the Owner,
shall execute and deliver an indenture supplemental hereto and such other instruments as may from time to time be necessary or advisable either (1) to constitute one or more bank or trust companies or one or more persons approved by the
Mortgagee, either to act jointly with the Mortgagee as additional trustee or trustees of all or any part of the Collateral, or to act as separate trustee or trustees of all or any part of the Collateral, in each case with such rights, powers, duties
and obligations consistent with this Trust Indenture as may be provided in such supplemental indenture or other instruments as the Mortgagee or a Majority in Interest of Note Holders may deem necessary or advisable, or (2) to clarify, add to or
subtract from the rights, powers, duties and obligations theretofore granted any such additional or separate trustee, subject in each case to the remaining provisions of this Section 9.02. If the Owner shall not have taken any action requested
of it under this Section 9.02(a) that is permitted or required by its terms within 15 days after the receipt of a written request from the Mortgagee so to do, or if an Event of Default shall have occurred and be continuing, the Mortgagee may
act under the foregoing provisions of this Section 9.02(a) without the concurrence of the Owner, and the Owner hereby irrevocably appoints (which appointment is coupled with an interest) the Mortgagee, its agent and attorney-in-fact to act for it under the foregoing provisions of this Section 9.02(a) in either of such contingencies. The Mortgagee may, in such capacity, execute,
deliver and perform any such supplemental indenture, or any such instrument, as may be required for the appointment of any such additional or separate trustee or for the clarification of, addition to or subtraction from the rights, powers, duties or
obligations theretofore granted to any such additional or separate trustee. In case any additional or separate trustee appointed under this Section 9.02(a) shall die, become incapable of acting, resign or be moved, all the assets, property,
rights, powers, trusts, duties and obligations of such additional or separate trustee shall revert to the Mortgagee until a successor additional or separate trustee is appointed as provided in this Section 9.02(a). 

  
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 (b) No additional or separate trustee shall be entitled to exercise any of the rights, powers,
duties and obligations conferred upon the Mortgagee in respect of the custody, investment and payment of monies and all monies received by any such additional or separate trustee from or constituting part of the Collateral or otherwise payable under
any Operative Agreement to the Mortgagee shall be promptly paid over by it to the Mortgagee. All other rights, powers, duties and obligations conferred or imposed upon any additional or separate trustee shall be exercised or performed by the
Mortgagee and such additional or separate trustee jointly except to the extent that applicable Law of any jurisdiction in which any particular act is to be performed renders the Mortgagee incompetent or unqualified to perform such act, in which
event such rights, powers, duties and obligations (including the holding of title to all or part of the Collateral in any such jurisdiction) shall be exercised and performed by such additional or separate trustee. No additional or separate trustee
shall take any discretionary action except on the instructions of the Mortgagee or a Majority in Interest of Note Holders. No trustee hereunder shall be personally liable by reason of any act or omission of any other trustee hereunder, except that
the Mortgagee shall be liable for the consequences of its lack of reasonable care in selecting, and the Mortgagee’s own actions in acting with, any additional or separate trustee. Each additional or separate trustee appointed pursuant to this
Section 9.02 shall be subject to, and shall have the benefit of Articles V through IX and Article XI hereof insofar as they apply to the Mortgagee. The powers of any additional or separate trustee appointed pursuant to this Section 9.02
shall not in any case exceed those of the Mortgagee hereunder. 
 (c) If at any time the Mortgagee shall deem it no longer necessary or in
order to conform to any such Law or take any such action or shall be advised by such counsel that it is no longer so necessary or desirable in the interest of the Note Holders, or in the event that the Mortgagee shall have been requested to do so in
writing by a Majority in Interest of Note Holders, the Mortgagee and, upon the written request of the Mortgagee, the Owner, shall execute and deliver an indenture supplemental hereto and all other instruments and agreements necessary or proper to
remove any additional or separate trustee. The Mortgagee may act on behalf of the Owner under this Section 9.02(c) when and to the extent it could so act under Section 9.02(a) hereof. 

ARTICLE X 
 SUPPLEMENTS
AND AMENDMENTS TO THIS TRUST INDENTURE 
 AND OTHER DOCUMENTS 

SECTION 10.01. Instructions of Majority; Limitations 

(a) The Mortgagee agrees with the Note Holders that it shall not enter into any amendment, waiver or modification of, supplement or consent to
this Trust Indenture, or any other Operative Agreement to which it is a party, unless such supplement, amendment, waiver, modification or consent is consented to in writing by a Majority in Interest of Note Holders, but upon the written request of a
Majority in Interest of Note Holders, the Mortgagee shall from time to time enter into any such supplement or amendment, or execute and deliver any 

  
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such waiver, modification or consent, as may be specified in such request and as may be (in the case of any such amendment, supplement or modification), to the extent such agreement is required,
agreed to by the Owner and, as may be appropriate, the Airframe Manufacturer or the Engine Manufacturer; provided, however, that, without the consent of each holder of an affected Equipment Note then outstanding and the Liquidity
Providers, no such amendment, waiver or modification of the terms of, or consent under, any thereof, shall (i) modify any of the provisions of this Section 10.01, or of Article II or III or Section 5.01, 5.02(c), 5.02(d), or 6.02
hereof, the definitions of “Event of Default,” “Default,” “Majority in Interest of Note Holders,” “Make-Whole Amount” or “Note Holder,” or the percentage of Note Holders required to take or approve
any action hereunder, (ii) reduce the amount, or change the time of payment or method of calculation of any amount, of Original Amount, Make-Whole Amount, if any, or interest with respect to any Equipment Note, (iii) reduce, modify or
amend any indemnities in favor of the Mortgagee or the Note Holders (except that the Mortgagee may consent to any waiver or reduction of an indemnity payable to it), or the other Indenture Indemnitees or (iv) permit the creation of any Lien on
the Trust Indenture Estate or any part thereof other than Permitted Liens or deprive any Note Holder of the benefit of the Lien of this Trust Indenture on the Collateral, except as provided in connection with the exercise of remedies under Article V
hereof; provided, further, that without the consent of each holder of an affected Related Equipment Note then outstanding, no such amendment, waiver or modification of terms of, or consent under, any thereof shall modify
Section 3.03 or deprive any Related Note Holder of the benefit of the Lien of this Trust Indenture on the Collateral, except as provided in connection with the exercise of remedies under Article V hereof. Notwithstanding the foregoing, without
the consent of the affected Liquidity Provider neither the Owner nor the Mortgagee shall enter into any amendment, waiver or modification of, supplement or consent to this Trust Indenture or the other Operative Agreements which shall reduce, modify
or amend any indemnities in favor of such Liquidity Provider. 
 (b) The Owner and the Mortgagee may enter into one or more agreements
supplemental hereto without the consent of any Note Holder for any of the following purposes: (i) (a) to cure any defect or inconsistency herein or in the Equipment Notes, or to make any change not inconsistent with the provisions hereof
(provided that such change does not adversely affect the interests of any Note Holder in its capacity solely as Note Holder) or (b) to cure any ambiguity or correct any mistake; (ii) to evidence the succession of another
party as the Owner in accordance with the terms hereof or to evidence the succession of a new trustee hereunder pursuant hereto, the removal of the trustee hereunder or the appointment of any co-trustee or co-trustees or any separate or additional trustee or trustees; (iii) to convey, transfer, assign, mortgage or pledge any property to or with the Mortgagee or to make any other provisions with respect to matters
or questions arising hereunder so long as such action shall not adversely affect the interests of the Note Holders in its capacity solely as Note Holder; (iv) to correct or amplify the description of any property at any time subject to the Lien
of this Trust Indenture or better to assure, convey and confirm unto the Mortgagee any property subject or required to be subject to the Lien of this Trust Indenture, the Airframe or Engines or any Replacement Airframe or Replacement Engine;
(v) to add to the covenants of the Owner for the benefit of the Note Holders, or to surrender any rights or power herein conferred upon the Owner; (vi) to add to the rights of the Note Holders; (vii) to provide for the reissuance of
Series A Equipment Notes (and Related Series A Equipment Notes) or Series B Equipment Notes (and Related Series B Equipment Notes) or the issuance (and payment and reissuance) from time to time of one or more separate series of Additional Series
Equipment Notes (and any Related 

  
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Additional Series Equipment Notes) and for pass through certificates issued by any pass through trust that acquires any such Equipment Notes and to make changes relating to any of the foregoing
(including without limitation to provide for the relative priority of different series of Additional Series Equipment Notes as between such series) and to provide for any credit support for any such reissued Equipment Notes or Related Equipment
Notes (including without limitation to secure claims for fees, interest, expenses, reimbursement of advances and other obligations arising from such credit support (including without limitation to specify such credit support as a “Liquidity
Facility” and the provider of any such credit support as a “Liquidity Provider”)), provided that such Equipment Notes are issued in accordance with the Note Purchase Agreement and Section 9.1 of the Intercreditor
Agreement; and (viii) to include on the Equipment Notes any legend as may be required by Law. 
 SECTION 10.02. Mortgagee
Protected 
 If, in the opinion of the institution acting as Mortgagee hereunder, any document required to be executed by it pursuant to
the terms of Section 10.01 hereof affects any right, duty, immunity or indemnity with respect to such institution under this Trust Indenture, such institution may in its discretion decline to execute such document. 

SECTION 10.03. Documents Mailed to Note Holders 

Promptly after the execution by the Owner or the Mortgagee of any document entered into pursuant to Section 10.01 hereof, the Mortgagee
shall mail, by first class mail, postage prepaid, a copy thereof to Owner (if not a party thereto) and to each Note Holder at its address last set forth in the Equipment Note Register, but the failure of the Mortgagee to mail such copies shall not
impair or affect the validity of such document. 
 SECTION 10.04. No Request Necessary for Trust Indenture Supplement 

No written request or consent of the Note Holders pursuant to Section 10.01 hereof shall be required to enable the Mortgagee to execute
and deliver a Trust Indenture Supplement specifically required by the terms hereof. 
 ARTICLE XI 

MISCELLANEOUS 
 SECTION
11.01. Termination of Trust Indenture 
 Upon (or at any time after) payment in full of the Original Amount of, Make-Whole Amount,
if any, and interest on and all other amounts due under all Equipment Notes and provided that there shall then be no other Secured Obligations due to the Indenture Indemnitees, the Note Holders and the Mortgagee hereunder or under the
Participation Agreement, any other Operative Agreement, any Related Equipment Note or any Related Indenture, the Owner shall direct the Mortgagee to execute and deliver to or as directed in writing by the Owner an appropriate instrument releasing
the Aircraft and the Engines and (subject to paragraph (v) of clause “Third” of Section 3.03 hereof, if applicable) all other Collateral from the Lien of this 

  
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Trust Indenture and the Mortgagee shall execute and deliver such instrument as aforesaid; provided, however, that this Trust Indenture and the trusts created hereby shall earlier
terminate and this Trust Indenture shall be of no further force or effect upon any sale or other final disposition by the Mortgagee of all property constituting part of the Collateral and the final distribution by the Mortgagee of all monies or
other property or proceeds constituting part of the Collateral in accordance with the terms hereof. Except as aforesaid otherwise provided, this Trust Indenture and the trusts created hereby shall continue in full force and effect in accordance with
the terms hereof. 
 SECTION 11.02. No Legal Title to Collateral in Note Holders 

No holder of an Equipment Note or a Related Equipment Note shall have legal title to any part of the Collateral. No transfer, by operation of
law or otherwise, of any Equipment Note or Related Equipment Note or other right, title and interest of any Note Holder or holder of a Related Equipment Note in and to the Collateral or hereunder shall operate to terminate this Trust Indenture or
entitle such holder or any successor or transferee of such holder to an accounting or to the transfer to it of any legal title to any part of the Collateral. 

SECTION 11.03. Sale of Aircraft by Mortgagee Is Binding 

Any sale or other conveyance of the Collateral, or any part thereof (including any part thereof or interest therein), by the Mortgagee made
pursuant to the terms of this Trust Indenture shall bind the Note Holders and shall be effective to transfer or convey all right, title and interest of the Mortgagee, the Owner and such holders in and to such Collateral or part thereof. No purchaser
or other grantee shall be required to inquire as to the authorization, necessity, expediency or regularity of such sale or conveyance or as to the application of any sale or other proceeds with respect thereto by the Mortgagee. 

SECTION 11.04. Trust Indenture for Benefit of Owner, Mortgagee, Note Holders and the other Indenture Indemnitees 

Nothing in this Trust Indenture, whether express or implied, shall be construed to give any person other than the Owner, the Mortgagee, the
Related Mortgagees, the Note Holders, the Related Note Holders and the other Indenture Indemnitees, any legal or equitable right, remedy or claim under or in respect of this Trust Indenture, except that the persons referred to in the last paragraph
of Section 4.02(b) shall be third party beneficiaries of such paragraph. 
 SECTION 11.05. Notices 

Unless otherwise expressly specified or permitted by the terms hereof, all notices, requests, demands, authorizations, directions, consents,
waivers or documents provided or permitted by this Trust Indenture to be made, given, furnished or filed shall be in writing, personally delivered or mailed by certified mail, postage prepaid, or by facsimile or confirmed telex, and (i) if to
the Owner, addressed to it at 233 S. Wacker Drive, Chicago, Illinois 60606, Attention: Treasurer, facsimile number (872) 825-0316, (ii) if to Mortgagee, addressed to it at its office at 1100 North Market
Street, Wilmington, Delaware 19890, Attention: Corporate Trust Administration, facsimile number (302) 636-4140, or (iii) if to any Note Holder or any Indenture

  
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Indemnitee, addressed to such party at such address as such party shall have furnished by notice to the Owner and the Mortgagee, or, until an address is so furnished, addressed to the address of
such party (if any) set forth on Schedule 1 to the Participation Agreement or in the Equipment Note Register. Whenever any notice in writing is required to be given by the Owner, the Mortgagee or any Note Holder to any of the other of them,
such notice shall be deemed given and such requirement satisfied when such notice is received, or if such notice is mailed by certified mail, postage prepaid, three Business Days after being mailed, addressed as provided above. Any party hereto may
change the address to which notices to such party will be sent by giving notice of such change to the other parties to this Trust Indenture. 

SECTION 11.06. Severability 

Any provision of this Trust Indenture which is prohibited or unenforceable in any jurisdiction shall, as to such jurisdiction, be ineffective
to the extent of such prohibition or unenforceability without invalidating the remaining provisions hereof. Any such prohibition or unenforceability in any particular jurisdiction shall not invalidate or render unenforceable such provision in any
other jurisdiction. 
 SECTION 11.07. No Oral Modification or Continuing Waivers 

No term or provision of this Trust Indenture or the Equipment Notes may be changed, waived, discharged or terminated orally, but only by an
instrument in writing signed by the Owner and the Mortgagee, in compliance with Section 10.01 hereof. Any waiver of the terms hereof or of any Equipment Note shall be effective only in the specific instance and for the specific purpose given.

 SECTION 11.08. Successors and Assigns 

All covenants and agreements contained herein shall be binding upon, and inure to the benefit of, each of the parties hereto and the permitted
successors and assigns of each, all as herein provided. Any request, notice, direction, consent, waiver or other instrument or action by any Note Holder shall bind the successors and assigns of such holder. Each Note Holder by its acceptance of an
Equipment Note agrees to be bound by this Trust Indenture and all provisions of the Operative Agreements applicable to a Note Holder. 

SECTION 11.09. Headings 

The headings of the various Articles and sections herein and in the table of contents hereto are for convenience of reference only and shall
not define or limit any of the terms or provisions hereof. 
 SECTION 11.10. Normal Commercial Relations 

Anything contained in this Trust Indenture to the contrary notwithstanding. Owner and Mortgagee may conduct any banking or other financial
transactions, and have banking or other commercial relationships, with Owner, fully to the same extent as if this Trust Indenture were not in effect, including without limitation the making of loans or other extensions of credit to Owner for any
purpose whatsoever, whether related to any of the transactions contemplated hereby or otherwise. 

  
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 SECTION 11.11. Governing Law; Counterpart Form 

THIS TRUST INDENTURE SHALL IN ALL RESPECTS BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK, INCLUDING ALL
MATTERS OF CONSTRUCTION, VALIDITY AND PERFORMANCE. THIS TRUST INDENTURE IS BEING DELIVERED IN THE STATE OF NEW YORK. This Trust Indenture may be executed by the parties hereto in separate counterparts (or upon separate signature pages bound together
into one or more counterparts), each of which when so executed and delivered shall be an original, but all such counterparts shall together constitute but one and the same instrument. 

SECTION 11.12. Voting By Note Holders 

All votes of the Note Holders shall be governed by a vote of a Majority in Interest of Note Holders, except as otherwise provided herein. 

SECTION 11.13. Bankruptcy 

It is the intention of the parties that the Mortgagee shall be entitled to the benefits of Section 1110 with respect to the right to take
possession of the Aircraft, Airframe, Engines and Parts and to enforce any of its other rights or remedies as provided herein in the event of a case under Chapter 11 of the Bankruptcy Code in which Owner is a debtor, and in any instance where more
than one construction is possible of the terms and conditions hereof or any other pertinent Operative Agreement, each such party agrees that a construction which would preserve such benefits shall control over any construction which would not
preserve such benefits. 

  
 61 

 IN WITNESS WHEREOF, the parties hereto have caused this Trust Indenture and Mortgage to be duly
executed by their respective officers thereof duly authorized as of the day and year first above written. 
  

			
	UNITED AIRLINES, INC.

 
			
		
	By:	 	  

		 	Name:
		 	Title:

 
			
	
	 WILMINGTON TRUST, NATIONAL ASSOCIATION,

as Mortgagee

 
			
		
	By:	 	  

		 	Name:
		 	Title:

  
 62 

 ANNEX A 

DEFINITIONS 
 GENERAL
PROVISIONS 
 (a) In each Operative Agreement, unless otherwise expressly provided, a reference to: 

 

	 	(i)	each of “Owner,” “Mortgagee,” “Note Holder” or any other person includes, without prejudice to the provisions of any Operative Agreement, any successor in interest to it and any permitted
transferee, permitted purchaser or permitted assignee of it; 

  

	 	(ii)	words importing the plural include the singular and words importing the singular include the plural; 

  

	 	(iii)	any agreement, instrument or document, or any annex, schedule or exhibit thereto, or any other part thereof, includes, without prejudice to the provisions of any Operative Agreement, that agreement, instrument or
document, or annex, schedule or exhibit, or part, respectively, as amended, modified or supplemented from time to time in accordance with its terms and in accordance with the Operative Agreements, and any agreement, instrument or document entered
into in substitution or replacement therefor (including, without limitation, in the case of each Pass Through Trust Agreement, the “Related Pass Through Trust Agreement” as defined therein); 

 

	 	(iv)	any provision of any Law includes any such provision as amended, modified, supplemented, substituted, reissued or reenacted prior to the Closing Date, and thereafter from time to time; 

 

	 	(v)	the words “Agreement,” “this Agreement,” “hereby,” “herein,” “hereto,” “hereof” and “hereunder” and words of similar import when used in any
Operative Agreement refer to such Operative Agreement as a whole and not to any particular provision of such Operative Agreement; 

  

	 	(vi)	the words “including,” “including, without limitation,” “including, but not limited to,” and terms or phrases of similar import when used in any Operative Agreement, with respect to any
matter or thing, mean including, without limitation, such matter or thing; and 

  

	 	(vii)	a “Section,” an “Exhibit,” an “Annex” or a “Schedule” in any Operative Agreement, or in any annex thereto, is a reference to a section of, or an exhibit, an annex or a schedule
to, such Operative Agreement or such annex, respectively. 

 (b) Each exhibit, annex and schedule to each Operative Agreement
is incorporated in, and shall be deemed to be a part of, such Operative Agreement. 

 (c) Unless otherwise defined or specified in any Operative Agreement, all accounting terms
therein shall be construed and all accounting determinations thereunder shall be made in accordance with GAAP. 
 (d) Headings used in any
Operative Agreement are for convenience only and shall not in any way affect the construction of, or be taken into consideration in interpreting, such Operative Agreement. 

(e) For purposes of each Operative Agreement, the occurrence and continuance of a Default or Event of Default referred to in
Section 5.01(v),(vi) or (vii) shall not be deemed to prohibit the Owner from taking any action or exercising any right that is conditioned on no Special Default, Default or Event of Default having occurred and be continuing if such Special
Default, Default or Event of Default consists of the institution of reorganization proceedings with respect to Owner under Chapter 11 of the Bankruptcy Code and the trustee or
debtor-in-possession in such proceedings shall have agreed to perform its obligations under the Trust Indenture with the approval of the applicable court and thereafter
shall have continued to perform such obligations in accordance with Section 1110. 
 DEFINED TERMS 

“Act” means part A of subtitle VII of title 49, United States Code. 

“Actual Knowledge” means (a) as it applies to Mortgagee, actual knowledge of a responsible officer in the Corporate
Trust Office, and (b) as it applies to Owner, actual knowledge of a Vice President or more senior officer of Owner or any other officer of Owner having responsibility for the transactions contemplated by the Operative Agreements;
provided that each of Owner and Mortgagee shall be deemed to have “Actual Knowledge” of any matter as to which it has received notice from Owner, any Note Holder or Mortgagee, such notice having been given pursuant to
Section 11.05 of the Trust Indenture. 
 “Additional Series” or “Additional Series Equipment Notes”
means Equipment Notes issued under the Trust Indenture and designated as a series (other than “Series AA”, “Series A” or “Series B”) thereunder, in the Original Amount and maturities and bearing interest as specified in
Schedule I to the Trust Indenture (as amended, in the case of any Additional Series issued after the date of the Trust Indenture, at the time of original issuance of such Additional Series) under the heading for such series. 

“Affiliate” means, with respect to any person, any other person directly or indirectly controlling, controlled by or under
common control with such person. For purposes of this definition, “control” means the power, directly or indirectly, to direct or cause the direction of the management and policies of such person, whether through the ownership of voting
securities or by contract or otherwise and “controlling,” “controlled by” and “under common control with” have correlative meanings. 

“Aircraft” means, collectively, the Airframe and Engines. 

  
 2 

 “Aircraft Bill of Sale” means the full warranty bill of sale covering the
Aircraft delivered by Airframe Manufacturer to Owner. 
 “Aircraft Documents” means all technical data, manuals and log
books, and all inspection, modification and overhaul records and other service, repair, maintenance and technical records that are required by the FAA (or the relevant Aviation Authority), to be maintained with respect to the Aircraft, Airframe,
Engines or Parts, and such term shall include all additions, renewals, revisions and replacements of any such materials from time to time made, or required to be made, by the FAA (or other Aviation Authority) regulations, and in each case in
whatever form and by whatever means or medium (including, without limitation, microfiche, microfilm, paper or computer disk) such materials may be maintained or retained by or on behalf of Owner (provided that all such materials shall
be maintained in the English language). 
 “Airframe” means (a) the aircraft (excluding Engines or engines from time
to time installed thereon) manufactured by Airframe Manufacturer and identified by Airframe Manufacturer’s model number, United States registration number and Airframe Manufacturer’s serial number set forth in the initial Trust Indenture
Supplement and any Replacement Airframe and (b) any and all Parts incorporated or installed in or attached or appurtenant to such airframe, and any and all Parts removed from such airframe, unless the Lien of the Trust Indenture shall not be
applicable to such Parts in accordance with Section 4.04 of the Trust Indenture. Upon substitution of a Replacement Airframe under and in accordance with the Trust Indenture, such Replacement Airframe shall become subject to the Trust Indenture
and shall be the “Airframe” for all purposes of the Trust Indenture and the other Operative Agreements and thereupon the Airframe for which the substitution is made shall no longer be subject to the Trust Indenture, and such replaced
Airframe shall cease to be the “Airframe.” 
 “Airframe Manufacturer” means The Boeing Company, a Delaware
corporation. 
 “Applicable Pass Through Trust” means each of the separate pass through trusts created under the Applicable
Pass Through Trust Agreements. 
 “Applicable Pass Through Trust Agreement” means each of the separate Pass Through Trust
Agreements by and between the Owner and an Applicable Pass Through Trustee. 
 “Applicable Pass Through Trustee” means each
Pass Through Trustee that is a party to the Participation Agreement. 
 “Average Life Date” for any Equipment Note shall be
the date which follows the time of determination by a period equal to the Remaining Weighted Average Life of such Equipment Note. “Remaining Weighted Average Life” on a given date with respect to any Equipment Note shall be the number of
days equal to the quotient obtained by dividing (a) the sum of each of the products obtained by multiplying (i) the amount of each then remaining scheduled payment of principal of such Equipment Note by (ii) the number of days from
and including such determination date to but excluding the date on which such payment of principal is scheduled to be made, by (b) the then outstanding principal amount of such Equipment Note. 

  
 3 

 “Aviation Authority” means the FAA or, if the Aircraft is permitted to be, and
is, registered with any other Government Entity under and in accordance with Section 4.02(e) of the Trust Indenture and Section 6.4.5 of the Participation Agreement, such other Government Entity. 

“Bankruptcy Code” means the United States Bankruptcy Code, 11 U.S.C. Sections 101 et seq. 

“Basic Pass Through Trust Agreement” means the Pass Through Trust Agreement, dated October 3, 2012, between Owner and
Pass Through Trustee, but does not include any Trust Supplement. 
 “Bills of Sale” means the FAA Bill of Sale and the
Aircraft Bill of Sale. 
 “Business Day” means any day other than a Saturday, Sunday or other day on which commercial banks
are authorized or required by law to close in New York, New York, Chicago, Illinois, or Wilmington, Delaware. 
 “Cape Town
Treaty” means the Cape Town Convention on International Interests in Mobile Equipment and the related Aircraft Equipment Protocol, as in effect in the United States. 

“Cash Equivalents” means the following securities (which shall mature within 90 days of the date of purchase thereof): (a)
direct obligations of the U.S. Government; (b) obligations fully guaranteed by the U.S. Government; (c) certificates of deposit issued by, or bankers’ acceptances of, or time deposits or a deposit account with, Mortgagee or any bank,
trust company or national banking association incorporated or doing business under the laws of the United States or any state thereof having a combined capital and surplus and retained earnings of at least $500,000,000 and having a rating of Aa or
better by Moody’s Investors Service, Inc. or AA or better by Fitch Ratings, Inc.; or (d) commercial paper of any issuer doing business under the laws of the United States or one of the states thereof and in each case having a rating
assigned to such commercial paper by Fitch Ratings, Inc. or Moody’s Investors Service, Inc. equal to A1 (or higher) or P-1, respectively. 

“Certificate Owner” is defined in the Pass Through Trust Agreements. 

“Citizen of the United States” is defined in 49 U.S.C. § 40102(a)(15). 

“Class AA Pass Through Trust” means the United Airlines Pass Through Trust
2018-1AA. 
 “Class A Pass Through Trust” means the United
Airlines Pass Through Trust 2018-1A. 
 “Class B Issuance Date”
means May 23, 2018. 
 “Class B Pass Through Trust” means the United Airlines Pass Through Trust 2018-1B. 

  
 4 

 “Closing” means the closing of the transactions contemplated by the
Participation Agreement. 
 “Closing Date” means the date on which the Closing occurs. 

“Code” means the Internal Revenue Code of 1986, as amended; provided that, when used in relation to a Plan,
“Code” shall mean the Internal Revenue Code of 1986 and any regulations and rulings issued thereunder, all as amended and in effect from time to time. 

“Collateral” is defined in the Granting Clause of the Trust Indenture. 

“Consent and Agreement” means the Manufacturer Consent and Agreement
[            ], dated as of even date with the Participation Agreement, of Airframe Manufacturer. 

“Corporate Trust Office” means the principal office of Mortgagee located at Mortgagee’s address for notices under the
Participation Agreement or such other office at which Mortgagee’s corporate trust business shall be administered which Mortgagee shall have specified by notice in writing to Owner and each Note Holder. 

“CRAF” means the Civil Reserve Air Fleet Program established pursuant to 10 U.S.C.
Section 9511-13 or any similar substitute program. 
 “Debt Rate” means, with
respect to (i) any Series of Equipment Notes, the rate per annum specified for such Series under the heading “Interest Rate” in Schedule I to the Trust Indenture (as amended, in the case of any Additional Series, at the time of
original issuance of such Additional Series), and (ii) any other purpose, with respect to any period, the weighted average interest rate per annum during such period borne by the outstanding Equipment Notes, excluding any interest payable at
the Payment Due Rate. 
 “Default” means any event or condition that with the giving of notice or the lapse of time or both
would become an Event of Default. 
 “Delivery Date” means the date on which the Aircraft is delivered by the Airframe
Manufacturer to, and accepted by, the Company. 
 “Deposit Agreement” means each of the three Deposit Agreements between
the Escrow Agent and the Depositary, dated as of the Issuance Date (or, in the case of the Deposit Agreement relating to the Class B Pass Through Trust, dated as of the Class B Issuance Date), which relate to the Class AA,
Class A or Class B Pass Through Trust, provided that, for purposes of any obligation of Owner, no amendment, modification or supplement to, or substitution or replacement of, any such Deposit Agreement shall be effective
unless consented to by Owner. 
 “Depositary” means Citibank, N.A., as Depositary under each Deposit Agreement. 

“Dollars,” “United States Dollars” or “$” means the lawful currency of the United States.

  
 5 

 “DOT” means the Department of Transportation of the United States or any
Government Entity succeeding to the functions of such Department of Transportation. 
 “EASA” means the European Aviation
Safety Agency or any Government Entity succeeding to the functions of the European Aviation Safety Agency. 
 “Eligible
Account” means an account established by and with an Eligible Institution at the request of the Mortgagee, which institution agrees, for all purposes of the UCC including Article 8 thereof, that (a) such account shall be a
“securities account” (as defined in Section 8-501(a) of the UCC), (b) all property (other than cash) credited to such account shall be treated as a “financial asset” (as defined in Section 8-102(a)(9) of the UCC), (c) the Mortgagee shall be the “entitlement holder” (as defined in Section 8-102(a)(7) of the UCC) in respect of such
account, (d) it will comply with all entitlement orders issued by the Mortgagee to the exclusion of the Owner, and (e) the “securities intermediary jurisdiction” (under
Section 8-110(e) of the UCC) shall be the State of New York. 
 “Eligible
Institution” means the corporate trust department of (a) WTNA, acting solely in its capacity as a “securities intermediary” (as defined in Section 8-102(a)(14) of the UCC), or
(b) a depository institution organized under the laws of the United States of America or any one of the states thereof or the District of Columbia (or any U.S. branch of a foreign bank), which has a long-term unsecured debt rating from
Moody’s Investors Service, Inc. and Fitch Ratings, Inc. of at least A-3 or its equivalent. 

“Engine” means (a) each of the engines manufactured by Engine Manufacturer and identified by Engine Manufacturer’s
model number and Engine Manufacturer’s serial number set forth in the initial Trust Indenture Supplement and originally installed on the Airframe on the Delivery Date, and any Replacement Engine, in any case whether or not from time to time
installed on such Airframe or installed on any other airframe or aircraft, and (b) any and all Parts incorporated or installed in or attached or appurtenant to such engine, and any and all Parts removed from such engine, unless the Lien of the
Trust Indenture shall not apply to such Parts in accordance with Section 4.04 of the Trust Indenture. Upon substitution of a Replacement Engine under and in accordance with the Trust Indenture, such Replacement Engine shall become subject to
the Trust Indenture and shall be an “Engine” for all purposes of the Trust Indenture and the other Operative Agreements and thereupon the Engine for which the substitution is made shall no longer be subject to the Trust Indenture, and such
replaced Engine shall cease to be an “Engine.” 
 “Engine Consent and Agreement” means the Engine Manufacturer
Consent and Agreement [            ], dated as of even date with the Participation Agreement, of Engine Manufacturer. 

“Engine Manufacturer” means
[                    ] a corporation organized under the laws of
[                    ]. 

“Equipment Note Register” is defined in Section 2.07 of the Trust Indenture. 

  
 6 

 “Equipment Notes” means and includes any equipment notes issued under the Trust
Indenture in the form specified in Section 2.01 thereof (as such form may be varied pursuant to the terms of the Trust Indenture) and any Equipment Note issued under the Trust Indenture in exchange for or replacement of any Equipment Note. 

“ERISA” means the Employee Retirement Income Security Act of 1974, and any regulations and rulings issued thereunder all as
amended and in effect from time to time. 
 “Escrow Agent” means U.S. Bank National Association, as Escrow Agent under each
of the Escrow Agreements. 
 “Escrow Agreement” means each of the three Escrow and Paying Agent Agreements, among the
Escrow Agent, the Paying Agent, certain initial purchasers of the Pass Through Certificates named therein and one of the Pass Through Trustees, dated as of the Issuance Date (or, in the case of the Escrow Agreement relating to the Class B Pass
Through Trust, dated as of the Class B Issuance Date), which relate to the Class AA, Class A or Class B Pass Through Trust, provided that, for purposes of any obligation of Owner, no amendment, modification or
supplement to, or substitution or replacement of, any such Escrow Agreement shall be effective unless consented to by Owner. 

“Event of Default” is defined in Section 5.01 of the Trust Indenture. 

“Event of Loss” means, with respect to the Aircraft, Airframe or any Engine, any of the following circumstances, conditions
or events with respect to such property, for any reason whatsoever: 
 (a) the destruction of such property, damage to such property beyond
economic repair or rendition of such property permanently unfit for normal use by Owner; 
 (b) the actual or constructive total loss of
such property or any damage to such property, or requisition of title or use of such property, which results in an insurance settlement with respect to such property on the basis of a total loss or constructive or compromised total loss; 

(c) any theft, hijacking or disappearance of such property for a period of 180 consecutive days or more; 

(d) any seizure, condemnation, confiscation, taking or requisition (including loss of title) of such property by any Government Entity or
purported Government Entity (other than a requisition of use by the U.S. Government) for a period exceeding 180 consecutive days; 
 (e) as
a result of any law, rule, regulation, order or other action by the Aviation Authority or by any Government Entity of the government of registry of the Aircraft or by any Government Entity otherwise having jurisdiction over the operation or use of
the Aircraft, the use of such property in the normal course of Owner’s business of passenger air transportation is prohibited for a period of 180 consecutive days unless Owner, prior to the expiration of such
180-day period, shall have undertaken and shall be diligently carrying forward such steps as may 

  
 7 

 
be necessary or desirable to permit the normal use of such property by Owner, but in any event if such use shall have been prohibited for a period of two consecutive years, provided
that no Event of Loss shall be deemed to have occurred if such prohibition has been applicable to Owner’s entire U.S. fleet of such property and Owner, prior to the expiration of such two-year
period, shall have conformed at least one unit of such property in its fleet to the requirements of any such law, rule, regulation, order or other action and commenced regular commercial use of the same in such jurisdiction and shall be diligently
carrying forward, in a manner which does not discriminate against such property in so conforming such property, steps which are necessary or desirable to permit the normal use of the Aircraft by Owner, but in any event if such use shall have been
prohibited for a period of three years. 
 “Expenses” means any and all liabilities, obligations, losses, damages,
settlements, penalties, claims, actions, suits, costs, expenses and disbursements (including, without limitation, reasonable fees and disbursements of legal counsel, accountants, appraisers, inspectors or other professionals, and costs of
investigation). 
 “FAA” means the Federal Aviation Administration of the United States or any Government Entity succeeding
to the functions of such Federal Aviation Administration. 
 “FAA Bill of Sale” means a bill of sale for the Aircraft on AC
Form 8050-2 (or such other form as may be approved by the FAA) delivered to Owner by Airframe Manufacturer. 

“FAA Filed Documents” means the FAA Bill of Sale, an application for registration of the Aircraft with the FAA in the name of
Owner, the Trust Indenture and the initial Trust Indenture Supplement. 
 “FAA Regulations” means the Federal Aviation
Regulations issued or promulgated pursuant to the Act from time to time. 
 “FATCA” means the provisions of Sections 1471
through 1474 of the Code and any current or future regulations or rules promulgated thereunder, or any successor or similar provisions. 

“Financing Statements” means, collectively, UCC financing statements covering the Collateral, by Owner, as debtor, showing
Mortgagee as secured party, for filing in Delaware and each other jurisdiction that, in the opinion of Mortgagee, is necessary to perfect its Lien on the Collateral. 

“GAAP” means generally accepted accounting principles as set forth in the statements of financial accounting standards issued
by the Financial Accounting Standards Board of the American Institute of Certified Public Accountants, as such principles may at any time or from time to time be varied by any applicable financial accounting rules or regulations issued by the SEC
and, with respect to any person, shall mean such principles applied on a basis consistent with prior periods except as may be disclosed in such person’s financial statements. 

“Government Entity” means (a) any federal, state, provincial or similar government, and any body, board, department,
commission, court, tribunal, authority, agency or other instrumentality of any such government or otherwise exercising any executive, legislative, 

  
 8 

 
judicial, administrative or regulatory functions of such government or (b) any other government entity having jurisdiction over any matter contemplated by the Operative Agreements or
relating to the observance or performance of the obligations of any of the parties to the Operative Agreements. 
 “GTA”
means [the General Terms Agreement No. 1-2728690849, dated July 12, 2012, between the Engine Manufacturer and Owner]9 [the General Terms Agreement
No. GE-1-172575605, dated as of September 30, 2005, between Engine Manufacturer, GE Engine Services Distribution, LLC and Owner,]10 [the General Terms Agreement No. 1-2728690849, dated July 12, 2012, between the Engine Manufacturer and Owner]11[the General Terms Agreement No. GE-1-172575605, dated as of September 30, 2005, between Engine Manufacturer,
GE Engine Services Distribution, LLC and Owner, as modified and made applicable to the Engines by the Letter Agreement GE GE90-115, dated April 14, 2015, among Engine Manufacturer, GE Engine Services
Distribution, LLC and Owner,]12 as amended. 
 “Indemnitee” means
(i) WTNA and Mortgagee, (ii) each separate or additional trustee appointed pursuant to the Trust Indenture, (iii) the Subordination Agent, the Paying Agent and the Escrow Agent, (iv) the Liquidity Providers, (v) the Pass
Through Trustees and each Related Note Holder, (vi) each Affiliate of the persons described in clauses (i) and (ii), (vii) each Affiliate of the persons described in clauses (iii), (iv) and (v), (viii) the respective directors, officers,
employees, agents and servants of each of the persons described in clauses (i), (ii) and (vi), (ix) the respective directors, officers, employees, agents and servants of each of the persons described in clauses (iii), (iv), (v) and (vii), (x)
the successors and permitted assigns of the persons described in clauses (i), (ii) and (viii), and (xi) the successors and permitted assigns of the persons described in clauses (iii), (iv), (v) and (ix); provided that the persons
described in clauses (iii), (iv), (v), (vii), (ix) and (xi) are Indemnitees only for purposes of Section 8.1 of the Participation Agreement. If any Indemnitee is Airframe Manufacturer or Engine Manufacturer or any subcontractor or supplier
of either thereof, such Person shall be an Indemnitee only in its capacity as Note Holder. 
 “Indenture Agreements” means
the Purchase Agreement and the Bills of Sale, to the extent included in Granting Clause (2) of the Trust Indenture, and any other contract, agreement or instrument from time to time assigned or pledged under the Trust Indenture. 

“Indenture Default” means any condition, circumstance, act or event that, with the giving of notice, the lapse of time or
both, would constitute an Indenture Event of Default. 
 “Indenture Event of Default” means any one or more of the
conditions, circumstances, acts or events set forth in Section 5.01 of the Trust Indenture. 
  

	9. 	Insert for Boeing 737-800 Aircraft. 

	10. 	Insert for Boeing 787-9 Aircraft. 

	11. 	Insert for Boeing 737 Max 9 Aircraft. 

	12. 	Insert for Boeing 777-300ER Aircraft. 

  
 9 

 “Indenture Indemnitee” means (i) WTNA and the Mortgagee, (ii) each
separate or additional trustee appointed pursuant to the Trust Indenture, (iii) the Subordination Agent, (iv) each Liquidity Provider, (v) each Pass Through Trustee and each Related Note Holder, (vi) the Paying Agent,
(vii) the Escrow Agent and (viii) each of the respective directors, officers, employees, agents and servants of each of the persons described in clauses (i) through (vii) inclusive above. 

“Intercreditor Agreement” means that certain Amended and Restated Intercreditor Agreement among the Pass Through Trustees,
the Liquidity Providers and the Subordination Agent, dated as of the Class B Issuance Date, provided that for purposes of any obligation of Owner, no amendment, modification or supplement to, or substitution or replacement of,
such Intercreditor Agreement shall be effective unless consented to by Owner. 
 “International Interest” is defined in the
Cape Town Treaty. 
 “International Registry” is defined in the Cape Town Treaty. 

“IRS” means the Internal Revenue Service of the United States or any Government Entity succeeding to the functions of such
Internal Revenue Service. 
 “Issuance Date” means February 14, 2018. 

“Law” means (a) any constitution, treaty, statute, law, decree, regulation, order, rule or directive of any Government
Entity, and (b) any judicial or administrative interpretation or application of, or decision under, any of the foregoing. 

“Lien” means any mortgage, pledge, lien, charge, claim, encumbrance, lease or security interest affecting the title to or any
interest in property. 
 “Liquidity Facilities” means the three Revolving Credit Agreements (consisting of one Revolving
Credit Agreement with the Liquidity Provider with respect to the Class AA Pass Through Trust, a second Revolving Credit Agreement with the Liquidity Provider with respect to the Class A Pass Through Trust, each of which is dated as of the
Issuance Date, and a third Revolving Credit Agreement with the Liquidity Provider with respect to the Class B Pass Through Trust, dated as of the Class B Issuance Date) between the Subordination Agent, as borrower, and the Liquidity
Provider, provided that, for purposes of any obligation of Owner, no amendment, modification or supplement to, or substitution or replacement of, any such Liquidity Facility shall be effective unless consented to by Owner. 

“Liquidity Provider” means National Australia Bank Limited, acting through its New York Branch, as “Class AA
Liquidity Provider”, “Class A Liquidity Provider” and “Class B Liquidity Provider” (as such terms are defined in the Intercreditor Agreement). 

“Majority in Interest of Note Holders” means as of a particular date of determination, the holders of a majority in aggregate
unpaid Original Amount of all Equipment Notes outstanding as of such date (excluding any Equipment Notes held by Owner or any of its Affiliates (unless all Equipment Notes then outstanding shall be held by Owner or any Affiliate of Owner);
provided that for the purposes of directing any action or casting any vote or giving 

  
 10 

 
any consent, waiver or instruction hereunder, any Note Holder of an Equipment Note or Equipment Notes may allocate, in such Note Holder’s sole discretion, any fractional portion of the
principal amount of such Equipment Note or Equipment Notes in favor of or in opposition to any such action, vote, consent, waiver or instruction. 

“Make-Whole Amount” means, with respect to any Equipment Note, an amount (as determined by an independent investment bank of
national standing) equal to the excess, if any, of (a) the present value of the remaining scheduled payments of principal and interest to maturity of such Equipment Note computed by discounting such payments on a semiannual basis on each
Payment Date (assuming a 360-day year of twelve 30-day months) using a discount rate equal to the Treasury Yield plus the Make-Whole Spread, over (b) the
outstanding principal amount of such Equipment Note plus accrued interest to the date of determination. For purposes of determining the Make-Whole Amount, “Treasury Yield” means, at the date of determination with respect to any Equipment
Note, the interest rate (expressed as a decimal and, in the case of United States Treasury bills, converted to a bond equivalent yield) determined to be the per annum rate equal to the semiannual yield to maturity for United States Treasury
securities maturing on the Average Life Date of such Equipment Note and trading in the public securities markets either as determined by interpolation between the most recent weekly average yield to maturity for two series of United States Treasury
securities, trading in the public securities markets, (A) one maturing as close as possible to, but earlier than, the Average Life Date of such Equipment Note and (B) the other maturing as close as possible to, but later than, the Average
Life Date of such Equipment Note, in each case as published in the most recent H.15 Page or, if a weekly average yield to maturity for United States Treasury securities maturing on the Average Life Date of such Equipment Note is reported in the most
recent H.15 Page, such weekly average yield to maturity as published in such H.15 Page. “H.15 Page” means the H.15 page published by the Board of Governors of the Federal Reserve System on its website (or successor publication of such
information by such Board of Governors). The date of determination of a Make-Whole Amount shall be the third Business Day prior to the applicable payment or redemption date and the “most recent H.15 Page” means the H.15 Page published
prior to the close of business on the third Business Day prior to the applicable payment or redemption date. 
 “Make-Whole
Spread” means (i) in the case of Series AA Equipment Notes, .125%, (ii) in the case of Series A Equipment Notes, .150%, (iii) in the case of Series B Equipment Notes, .30% and (iv)in the case of any Additional Series, the percentage
specified in Schedule I hereto (as amended at the time of original issuance of such Additional Series) as the “Make-Whole Spread” for such Additional Series. 

“Material Adverse Change” means, with respect to any person, any event, condition or circumstance that materially and
adversely affects such person’s business or consolidated financial condition, or its ability to observe or perform its obligations, liabilities and agreements under the Operative Agreements. 

“Minimum Liability Insurance Amount” is defined in Schedule 3 to the Participation Agreement. 

“Mortgaged Property” is defined in Section 3.03 of the Trust Indenture. 

  
 11 

 “Mortgagee” means Wilmington Trust, National Association, a national banking
association, not in its individual capacity but solely as mortgagee under the Trust Indenture. 

“Non-U.S. Person” means any Person other than a United States person, as defined in
Section 7701(a)(30) of the Code. 
 “Note Holder” means at any time each registered holder of one or more Equipment
Notes. 
 “Note Purchase Agreement” means the Note Purchase Agreement, dated as of the Issuance Date, among United
Airlines, Inc., the Subordination Agent, the Escrow Agent, the Paying Agent and the Pass Through Trustee under each Pass Through Trust Agreement (other than the Escrow Agent, the Paying Agent and the Pass Through Trustee with respect to the
Class B Pass Through Trust), as amended by Amendment No. 1 to Note Purchase Agreement, dated as of the Class B Issuance Date providing for, among other things, the issuance and sale of certain equipment notes. 

“NY UCC” means the UCC as in effect on the date of determination in the State of New York. 

“Officer’s Certificate” means, in respect of any Person, a certificate signed by the Chairman, the President, any Vice
President (including those with varying ranks such as Executive, Senior, Assistant or Staff Vice President), the Treasurer or the Secretary of such Person. 

“Operative Agreements” means, collectively, the Participation Agreement, the Trust Indenture, the initial Trust Indenture
Supplement, the Bills of Sale, and the Equipment Notes. 
 “Operative Indentures” means each of the indentures under which
notes have been issued and purchased by the Pass Through Trustees pursuant to the Note Purchase Agreement (whether before or after the date of this Trust Indenture). 

“Original Amount,” with respect to an Equipment Note, means the stated original principal amount of such Equipment Note and,
with respect to all Equipment Notes, means the aggregate stated original principal amounts of all Equipment Notes. 
 “Owner
Person” means Owner, any lessee, assignee, successor or other user or person in possession of the Aircraft, Airframe or an Engine with or without color of right, or any Affiliate of any of the foregoing (excluding any Tax Indemnitee or any
related Tax Indemnitee with respect thereto, or any person using or claiming any rights with respect to the Aircraft, Airframe or an Engine directly by or through any of the persons in this parenthetical). 

“Participation Agreement” means the Participation Agreement
[            ], dated as of [            ], among Owner, the Applicable Pass Through Trustees, the Subordination
Agent and Mortgagee. 

  
 12 

 “Parts” means all appliances, parts, components, instruments, appurtenances,
accessories, furnishings, seats and other equipment of whatever nature (other than (a) Engines or engines, and (b) any Removable Part leased by Owner from a third party or subject to a security interest granted to a third party), that may
from time to time be installed or incorporated in or attached or appurtenant to the Airframe or any Engine or removed therefrom unless the Lien of the Trust Indenture shall not be applicable thereto in accordance with Section 4.04 of the Trust
Indenture. 
 “Pass Through Agreements” means the Pass Through Trust Agreements, the Note Purchase Agreement, the Deposit
Agreements, the Escrow Agreements, the Intercreditor Agreement, the Liquidity Facilities and the Fee Letter referred to in Section 2.03 of each of the Liquidity Facilities, provided that no amendment, modification or supplement
to, or substitution or replacement of, any such Fee Letter shall be effective for purposes of any obligation of Owner, unless consented to by Owner. 

“Pass Through Certificates” means the pass through certificates issued by the Pass Through Trusts (and any other pass through
certificates for which such pass through certificates may be exchanged). 
 “Pass Through Trust” means each of the three
separate pass through trusts created under the Pass Through Trust Agreements. 
 “Pass Through Trust Agreement” means each
of the three separate Trust Supplements, together in each case with the Basic Pass Through Trust Agreement, each dated as of the Issuance Date (or, in the case of the Pass Through Trust Agreement relating to the Class B Pass Through Trust,
dated as of the Class B Issuance Date) by and between the Owner and a Pass Through Trustee, provided that, for purposes of any obligation of Owner, no amendment, modification or supplement to, or substitution or replacement of,
any such Agreement shall be effective unless consented to by Owner. 
 “Pass Through Trustee” means Wilmington Trust,
National Association, a national banking association, in its capacity as trustee under each Pass Through Trust Agreement. 
 “Pass
Through Trustee Agreements” means the Participation Agreement, the Pass Through Trust Agreements, the Note Purchase Agreement, the Deposit Agreements, the Escrow Agreements, and the Intercreditor Agreement. 

“Paying Agent” means Wilmington Trust, National Association, as paying agent under each of the Escrow Agreements. 

“Payment Date” means each March 1 and September 1, commencing on
[                    ].13 

 
  

	13. 	Insert first March 1 or September 1 after the Closing Date, excluding March 1, 2018. 

  
 13 

 “Payment Due Rate” means (a) with respect to (i) any payment made to a
Note Holder under any Series of Equipment Notes, the Debt Rate applicable to such Series plus 2% and (ii) any other payment made under any Operative Agreement to any other Person, the Debt Rate applicable to such payment plus 2% or, if less,
(b) the maximum rate permitted by applicable law. 
 “Permitted Air Carrier” means (i) any manufacturer of
airframes or aircraft engines, or any Affiliate of a manufacturer of airframes or aircraft engines, (ii) any Permitted Foreign Air Carrier, (iii) any person approved in writing by Mortgagee or (iv) any U.S. Air Carrier. 

“Permitted Country” means any country listed on Schedule 4 to the Participation Agreement. 

“Permitted Foreign Air Carrier” means any air carrier with its principal executive offices in any Permitted Country and which
is authorized to conduct commercial airline operations and to operate jet aircraft similar to the Aircraft under the applicable Laws of such Permitted Country. 

“Permitted Government Entity” means (i) the U.S. Government or (ii) any Government Entity if the Aircraft is then
registered under the laws of the country of such Government Entity. 
 “Permitted Lien” means (a) the rights of
Mortgagee under the Operative Agreements, or of any Permitted Lessee under any Permitted Lease; (b) Liens attributable to Mortgagee (both in its capacity as trustee under the Trust Indenture and in its individual capacity); (c) the rights of
others under agreements or arrangements to the extent expressly permitted by the terms of Section 4.02(b) or 4.04 of the Trust Indenture; (d) Liens for Taxes of Owner (and its U.S. federal tax law consolidated group), or Liens for Taxes of
any Tax Indemnitee (and its U.S. federal tax law consolidated group) for which Owner is obligated to indemnify such Tax Indemnitee under any of the Operative Agreements, in any such case either not yet due or being contested in good faith by
appropriate proceedings so long as such Liens and such proceedings do not involve any material risk of the sale, forfeiture or loss of the Aircraft, the Airframe, or any Engine or the interest of Mortgagee therein or impair the Lien of the Trust
Indenture; (e) materialmen’s, mechanics’, workers’, repairers’, employees’ or other like Liens arising in the ordinary course of business for amounts the payment of which is either not yet delinquent for more than 60
days or is being contested in good faith by appropriate proceedings, so long as such Liens and such proceedings do not involve any material risk of the sale, forfeiture or loss of the Aircraft, the Airframe, or any Engine or the interest of
Mortgagee therein or impair the Lien of the Trust Indenture; (f) Liens arising out of any judgment or award against Owner (or any Permitted Lessee), so long as such judgment shall, within 60 days after the entry thereof, have been discharged or
vacated, or execution thereof stayed pending appeal or shall have been discharged, vacated or reversed within 60 days after the expiration of such stay, and so long as during any such 60 day period there is not, or any such judgment or award does
not involve, any material risk of the sale, forfeiture or loss of the Aircraft, the Airframe, or any Engine or the interest of Mortgagee therein or impair the Lien of the Trust Indenture; (g) any other Lien with respect to which Owner (or any
Permitted Lessee) shall have provided a bond, cash collateral or other security adequate in the reasonable opinion of Mortgagee. 

  
 14 

 “Permitted Lease” means a lease permitted under Section 4.02(b) of the
Trust Indenture. 
 “Permitted Lessee” means the lessee under a Permitted Lease. 

“Persons” or “persons” means individuals, firms, partnerships, joint ventures, trusts, trustees, Government
Entities, organizations, associations, corporations, limited liability companies, government agencies, committees, departments, authorities and other bodies, corporate or incorporate, whether having distinct legal status or not, or any member of any
of the same. 
 “Plan” means any employee benefit plan within the meaning of Section 3(3) of ERISA, or any plan within
the meaning of Section 4975(e)(1) of the Code. 
 “Prospective International Interest” is defined in the Cape Town
Treaty. 
 “Purchase Agreement” means [the Purchase Agreement No. PA-03784, dated
as of July 12, 2012 (which incorporates and amends the terms and conditions of the Aircraft General Terms Agreement AGTA-UAL, dated as of February 19, 2010), between the Airframe Manufacturer and
Owner]14 [the Purchase Agreement No. PA-03776, dated as of July 12, 2012,between the Airframe Manufacturer and Owner (as assignee of UCH) (which
incorporates the terms and conditions (except as specifically set forth in such Purchase Agreement) of the Aircraft General Terms Agreement, dated as of July 12, 2012 between the Airframe Manufacturer and UCH]15 [the Purchase Agreement No. 2484, dated as of December 29, 2004 between the Airframe Manufacturer and Owner]16 [the Purchase Agreement No. 04308 dated January 14, 2015 between the Airframe Manufacturer and Owner (which incorporates the terms and conditions (except as specifically set forth in such
Purchase Agreement) of the Aircraft General Terms Agreement, dated as of February 19, 2010 between the Airframe Manufacturer and Owner)]17, as amended (including all exhibits thereto,
together with all letter agreements entered into that by their terms constitute part of such Purchase Agreement) and the GTA, in each case to the extent included in the Granting Clause (2) of the Trust Indenture. 

“QIB” is defined in Section 2.08 of the Trust Indenture. 

“Related Additional Series Equipment Note” means, with respect to any particular series of Additional Series Equipment Notes
and as of any date, an “Additional Series Equipment Note”, as defined in each Related Indenture, having the same designation as such series of Additional Series Equipment Notes, but only if as of such date it is held by the
“Subordination Agent” under the “Intercreditor Agreement”, as such terms are defined in such Related Indenture. 

 

	14. 	Insert for Boeing 737-800 Aircraft. 

	15. 	Insert for Boeing 737 MAX 9 Aircraft. 

	16. 	Insert for Boeing 787-9 Aircraft. 

	17. 	 Insert for Boeing 777-300ER Aircraft.

  
 15 

 “Related Equipment Note” means, as of any date, an “Equipment Note” as
defined in each Related Indenture, but only if as of such date it is held by the “Subordination Agent” under the “Intercreditor Agreement”, as such terms are defined in such Related Indenture. 

“Related Indenture” means each Operative Indenture (other than the Trust Indenture). 

“Related Indenture Event of Default” means any “Indenture Event of Default” under any Related Indenture. 

“Related Make-Whole Amount” means the “Make-Whole Amount”, as defined in each Related Indenture. 

“Related Mortgagee” means the “Mortgagee” as defined in each Related Indenture. 

“Related Note Holder” means a registered holder of a Related Equipment Note. 

“Related Secured Obligations” means, as of any date, the outstanding “Original Amount”, as defined in each Related
Indenture, of the Related Equipment Notes issued under such Related Indenture, the accrued and unpaid interest due thereon in accordance with such Related Indenture as of such date, the Related Make-Whole Amount, if any, due with respect thereto and
all other amounts due with respect thereto in accordance with such Related Indenture. 
 “Related Series AA Equipment Note”
means, as of any date, a “Series AA Equipment Note”, as defined in each Related Indenture, but only if as of such date it is held by the “Subordination Agent” under the “Intercreditor Agreement”, as such terms are
defined in such Related Indenture. 
 “Related Series A Equipment Note” means, as of any date, a “Series A Equipment
Note”, as defined in each Related Indenture, but only if as of such date it is held by the “Subordination Agent” under the “Intercreditor Agreement”, as such terms are defined in such Related Indenture. 

“Related Series B Equipment Note” means, as of any date, a “Series B Equipment Note”, as defined in each Related
Indenture, but only if as of such date it is held by the “Subordination Agent” under the “Intercreditor Agreement”, as such terms are defined in such Related Indenture. 

“Removable Part” is defined in Section 4.04(d) of the Trust Indenture. 

  
 16 

 “Replacement Airframe” means any airframe substituted for the Airframe pursuant
to Article IV of the Trust Indenture. 
 “Replacement Engine” means an engine substituted for an Engine pursuant to Article
IV of the Trust Indenture. 
 “SEC” means the Securities and Exchange Commission of the United States, or any Government
Entity succeeding to the functions of such Securities and Exchange Commission. 
 “Section 1110” means
11 U.S.C. Section 1110 of the Bankruptcy Code or any successor or analogous section of the federal bankruptcy law in effect from time to time. 

“Secured Obligations” is defined in Section 2.06 of the Trust Indenture. 

“Securities Account” is defined in Section 3.07 of the Trust Indenture. 

“Securities Act” means the Securities Act of 1933, as amended. 

“Security” means a “security” as defined in Section 2(l) of the Securities Act. 

“Senior Holder” is defined in Section 2.13(c) of the Trust Indenture. 

“Series” means any of Series AA, Series A, Series B or any Additional Series. 

“Series AA” or “Series AA Equipment Notes” means Equipment Notes issued under the Trust Indenture and
designated as “Series AA” thereunder, in the Original Amount and maturities and bearing interest as specified in Schedule I to the Trust Indenture under the heading “Series AA.” 

“Series A” or “Series A Equipment Notes” means Equipment Notes issued under the Trust Indenture and
designated as “Series A” thereunder, in the Original Amount and maturities and bearing interest as specified in Schedule I to the Trust Indenture under the heading “Series A”. 

“Series B” or “Series B Equipment Notes” means Equipment Notes issued under the Trust Indenture and
designated as “Series B” thereunder, in the Original Amount and maturities and bearing interest as specified in Schedule I to the Trust Indenture under the heading “Series B”. 

“Similar Aircraft” means a Boeing Model [insert model reference the same as the Aircraft] aircraft. 

“Special Default” means (i) the failure by Owner to pay any amount of principal of or interest on any Equipment Note
when due or (ii) the occurrence of any Default or Event of Default referred to in Section 5.01(v), (vi) or (vii). 

  
 17 

 “Subordination Agent” means Wilmington Trust, National Association, as
subordination agent under the Intercreditor Agreement, or any successor thereto. 
 “Tax Indemnitee” means (a) WTNA
and Mortgagee, (b) each separate or additional trustee appointed pursuant to the Trust Indenture, (c) each Note Holder and (d) the respective successors, assigns, agents and servants of the foregoing. 

“Taxes” means all license, recording, documentary, registration and other similar fees and all taxes, levies, imposts,
duties, charges, assessments or withholdings of any nature whatsoever imposed by any Taxing Authority, together with any penalties, additions to tax, fines or interest thereon or additions thereto. 

“Taxing Authority” means any federal, state or local government or other taxing authority in the United States, any foreign
government or any political subdivision or taxing authority thereof, any international taxing authority or any territory or possession of the United States or any taxing authority thereof. 

“Threshold Amount” is defined in Schedule 3 to the Participation Agreement. 

“Transaction Expenses” means all costs and expenses incurred by Mortgagee in connection with (a) the preparation,
execution and delivery of the Operative Agreements and the recording or filing of any documents, certificates or instruments in accordance with any Operative Agreement, including, without limitation, the FAA Filed Documents and the Financing
Statements, (b) the initial fee of Mortgagee under the Trust Indenture and (c) the reasonable fees and disbursements of counsel for each Mortgagee and special counsel in Oklahoma City, Oklahoma, in each case, in connection with the
Closing. 
 “Transactions” means the transactions contemplated by the Participation Agreement. 

“Transfer” means the transfer, sale, assignment or other conveyance of all or any interest in any property, right or
interest. 
 “Transferee” means a person to which any Note Holder purports or intends to Transfer any or all of its right,
title or interest in the Equipment Note, as described in Section 9 of the Participation Agreement. 
 “Trust
Indenture” means the Trust Indenture and Mortgage [            ], dated as of the date of the Participation Agreement between Owner and Mortgagee. 

“Trust Indenture Supplement” means a Trust Indenture and Mortgage Supplement, substantially in the form of Exhibit A to the
Trust Indenture, with appropriate modifications to reflect the purpose for which it is being used. 
 “Trust Supplement”
means an agreement supplemental to the Basic Pass Through Trust Agreement pursuant to which (i) a separate trust is created for the benefit of the holders of the Pass Through Certificates of a class, (ii) the issuance of the Pass Through
Certificates of such class representing fractional undivided interests in such trust is authorized and (iii) the terms of the Pass Through Certificates of such class are established. 

  
 18 

 “UCC” means the Uniform Commercial Code as in effect in any applicable
jurisdiction. 
 “UCH” means United Continental Holdings, Inc., a Delaware corporation. 

“United States” or “U.S.” means the United States of America; provided that for geographic
purposes, “United States” means, in aggregate, the 50 states and the District of Columbia of the United States of America. 

“U.S. Air Carrier” means any United States air carrier that is a Citizen of the United States holding an air carrier
operating certificate issued pursuant to chapter 447 of title 49 of the United States Code for aircraft capable of carrying 10 or more individuals or 6000 pounds or more of cargo, and as to which there is in force an air carrier operating
certificate issued pursuant to Part 121 of the FAA Regulations, or which may operate as an air carrier by certification or otherwise under any successor or substitute provisions therefor or in the absence thereof. 

“U.S. Government” means the federal government of the United States, or any instrumentality or agency thereof the obligations
of which are guaranteed by the full faith and credit of the federal government of the United States. 
 “U.S. Person” means
any Person described in Section 7701 (a)(30) of the Code. 
 “Weighted Average Life to Maturity” means, with respect
to any specified Debt, at the time of the determination thereof the number of years obtained by dividing the then Remaining Dollar-years of such Debt by the then outstanding principal amount of such Debt. The term “Remaining Dollar-years”
shall mean the amount obtained by (1) multiplying the amount of each then-remaining principal payment on such Debt by the number of years (calculated at the nearest one-twelfth) that will elapse between
the date of determination of the Weighted Average Life to Maturity of such Debt and the date of that required payment and (2) totaling all the products obtained in clause (1) above. 

“Wet Lease” means any arrangement whereby Owner or a Permitted Lessee agrees to furnish the Aircraft, Airframe or any Engine
to a third party pursuant to which the Aircraft, Airframe or Engine shall at all times be in the operational control of Owner or a Permitted Lessee, provided that Owner’s obligations under the Trust Indenture shall continue in
full force and effect notwithstanding any such arrangement. 
 “WTNA” means Wilmington Trust, National Association, a
national banking association, not in its capacity as Mortgagee under the Trust Indenture, but in its individual capacity. 

  
 19 

					
		 		 	ANNEX B - INSURANCE
		 		 	TRUST INDENTURE [        ]

 ANNEX B 

INSURANCE 
 Capitalized
terms used but not defined herein shall have the respective meanings set forth or incorporated by reference in Annex A to the Trust Indenture. 
 A.
Liability Insurance 
 1. Except as provided in Section A.2 below, Owner (or Permitted Lessee) will carry or cause to be carried at
all times, at no expense to Mortgagee, commercial airline legal liability (including, but not limited to passenger liability, property damage, baggage liability, cargo and mail liability, hangarkeeper’s liability and contractual liability
insurance) with respect to the Aircraft, the Airframe and the Engines, which is (i) in an amount not less than the greater of (x) the amount of commercial airline legal liability insurance from time to time applicable to aircraft owned or
leased and operated by Owner (or Permitted Lessee) of the same type and operating on similar routes as the Aircraft and (y) the Minimum Liability Insurance Amount per occurrence; (ii) of the type and covering the same risks as from time to
time applicable to aircraft operated by Owner (or Permitted Lessee) of the same type as the Aircraft; and (iii) maintained in effect with insurers of nationally or internationally recognized responsibility (such insurers being referred to
herein as “Approved Insurers”). Owner (or Permitted Lessee) need not maintain cargo liability insurance with respect to the Aircraft, or may maintain such insurance in an amount less than the Minimum Liability Insurance Amount, as long as
the amount of the cargo liability insurance, if any, maintained with respect to such Aircraft is not less than the amount of such coverage which is maintained by Owner (or Permitted Lessee) for other aircraft owned or leased by Owner (or Permitted
Lessee) that are similar in type to such Aircraft and operated by Owner (or Permitted Lessee) on the same or similar routes. 
 2. During any
period that the Aircraft is on the ground and not in operation, Owner (or Permitted Lessee) may carry or cause to be carried, in lieu of the insurance required by Section A.1 above, insurance otherwise conforming with the provisions of said
Section A.1 except that (i) the amounts of coverage shall not be required to exceed the amounts of public liability and property damage insurance from time to time applicable to aircraft owned or operated by Owner (or Permitted Lessee) of
the same type as the Aircraft which are on the ground and not in operation and (ii) the scope of the risks covered and the type of insurance shall be the same as from time to time shall be applicable to aircraft owned or operated by Owner (or
Permitted Lessee) of the same type which are on the ground and not in operation. 
 B. Hull Insurance 

1. Except as provided in Section B.2 below, Owner (or Permitted Lessee) will carry or cause to be carried at all times, at no expense to
Mortgagee, with Approved Insurers “all-risk” ground and flight aircraft hull insurance covering the Aircraft (including the Engines when they are installed on the Airframe or any other airframe)
which is of the type as from time to time applicable to aircraft owned by Owner (or Permitted Lessee) of the same type as the Aircraft for an amount denominated in United States Dollars not less than the unpaid Original Amount together with six
months of interest accrued thereon (collectively, the “Debt Balance”). 

 Any policies of insurance carried in accordance with this Section B.1 or Section C
covering the Aircraft and any policies taken out in substitution or replacement for any such policies (i) shall name Mortgagee as exclusive loss payee for any proceeds to be paid under such policies up to an amount equal to the Debt Balance and
(ii) shall provide that (A) in the event of a loss involving proceeds in excess of the Threshold Amount, the proceeds in respect of such loss up to an amount equal to the Debt Balance shall be payable to the Mortgagee, except in the case
of a loss with respect to an Engine installed on an airframe other than the Airframe, in which case Owner (or any Permitted Lessee) shall endeavor to arrange for any payment of insurance proceeds in respect of such loss to be held for the account of
the Mortgagee whether such payment is made to Owner (or any Permitted Lessee) or any third party, it being understood and agreed that in the case of any payment to Mortgagee otherwise than in respect of an Event of Loss, the Mortgagee shall, upon
receipt of evidence satisfactory to it that the damage giving rise to such payment shall have been repaired or that such payment shall then be required to pay for repairs then being made, pay the amount of such payment to Owner or its order, and
(B) the entire amount of any loss involving proceeds of the Threshold Amount or less or the amount of any proceeds of any loss in excess of the Debt Balance shall be paid to Owner or its order unless an Event of Default shall have occurred and
be continuing and the insurers have been notified thereof by the Mortgagee. In the case of a loss with respect to an engine (other than an Engine) installed on the Airframe, Mortgagee shall hold any payment to it of any insurance proceeds in respect
of such loss for the account of Owner or any other third party that is entitled to receive such proceeds. 
 2. During any period that the
Aircraft is on the ground and not in operation, Owner (or Permitted Lessee) may carry or cause to be carried, in lieu of the insurance required by Section B.1 above, insurance otherwise conforming with the provisions of said Section B.1
except that the scope of the risks and the type of insurance shall be the same as from time to time applicable to aircraft owned by Owner (or Permitted Lessee) of the same type similarly on the ground and not in operation, provided
that Owner (or Permitted Lessee) shall maintain insurance against risk of loss or damage to the Aircraft in an amount equal to the Debt Balance during such period that the Aircraft is on the ground and not in operation. 

C. War-Risk, Hijacking and Allied Perils Insurance 

If Owner (or any Permitted Lessee) shall at any time operate or propose to operate the Aircraft, Airframe or any Engine (i) in any area of
recognized hostilities or (ii) on international routes and war-risk, hijacking or allied perils insurance is maintained by Owner (or any Permitted Lessee) with respect to other aircraft owned or operated
by Owner (or any Permitted Lessee) on such routes or in such areas, Owner (or Permitted Lessee) shall maintain or cause to be maintained war-risk, hijacking and related perils insurance of substantially the
same type carried by major United States commercial air carriers operating the same or comparable models of aircraft on similar routes or in such areas and in no event in an amount less than the unpaid Original Amount. 

D. General Provisions 
 Any policies of
insurance carried in accordance with Sections A, B and C, including any policies taken out in substitution or replacement for such policies: 

  
 2 

 (i) in the case of Section A, shall name Mortgagee, each Note Holder, each
Related Mortgagee, each Related Note Holder and each Liquidity Provider as an additional insured (collectively, the “Additional Insureds”), as its interests may appear; 

(ii) shall apply worldwide and have no territorial restrictions or limitations (except only in the case of war, hijacking and
related perils insurance required under Section C, which shall apply to the fullest extent available in the international insurance market); 

(iii) shall provide that, in respect of the interests of the Additional Insureds in such policies, the insurance shall not be
invalidated or impaired by any act or omission (including misrepresentation and nondisclosure) by Owner (or any Permitted Lessee) or any other Person (including, without limitation, use for illegal purposes of the Aircraft or any Engine) and shall
insure the Additional Insureds regardless of any breach or violation of any representation, warranty, declaration, term or condition contained in such policies by Owner (or any Permitted Lessee); 

(iv) shall provide that, if the insurers cancel such insurance for any reason whatsoever, or if the same is allowed to lapse
for nonpayment of premium, or if any material change is made in the insurance which adversely affects the interest of any of the Additional Insureds, such cancellation, lapse or change shall not be effective as to the Additional Insureds for thirty
(30) days (seven (7) days in the case of war risk, hijacking and allied perils insurance and ten (10) days in case of nonpayment of premium) after receipt by the Additional Insureds of written notice by such insurers of such
cancellation, lapse or change, provided that if any notice period specified above is not reasonably obtainable, such policies shall provide for as long a period of prior notice as shall then be reasonably obtainable; 

(v) shall waive any rights of setoff (including for unpaid premiums), recoupment, counterclaim or other deduction, whether by
attachment or otherwise, against each Additional Insured; 
 (vi) shall waive any right of subrogation against any Additional
Insured; 
 (vii) shall be primary without right of contribution from any other insurance that may be available to any
Additional Insured; 
 (viii) shall provide that all of the liability insurance provisions thereof, except the limits of
liability, shall operate in all respects as if a separate policy had been issued covering each party insured thereunder; 

(ix) shall provide that none of the Additional Insureds shall be liable for any insurance premium; and 

(x) shall contain a 50/50% Clause per Lloyd’s Aviation Underwriters’ Association Standard Policy Form AVS 103 or US
market equivalent. 

  
 3 

 E. Reports and Certificates; Other Information 

On or prior to the Closing Date and on or prior to each renewal date of the insurance policies required hereunder, Owner(or Permitted Lessee)
will furnish or cause to be furnished to Mortgagee insurance certificates describing in reasonable detail the insurance maintained by Owner (or Permitted Lessee) hereunder and a report, signed by Owner’s (or Permitted Lessee’s) regularly
retained independent insurance broker (the “Insurance Broker”), stating the opinion of such Insurance Broker that (a) all premiums in connection with such insurance then due have been paid and (b) such insurance complies with the
terms of this Annex B, except that such opinion shall not be required with respect to war risk insurance or indemnity provided by the U.S. Government. To the extent such agreement is reasonably obtainable Owner (or Permitted Lessee) will also cause
the Insurance Broker to agree to advise Mortgagee in writing of any default in the payment of any premium and of any other act or omission on the part of Owner (or Permitted Lessee) of which it has knowledge and which might invalidate or render
unenforceable, in whole or in part, any insurance on the Aircraft or Engines required hereunder or cause the cancellation or termination of such insurance, and to advise Mortgagee in writing at least thirty (30) days (seven (7) days in the
case of war-risk and allied perils coverage and ten (10) days in the case of nonpayment of premium, or such shorter period as may be available in the international insurance market, as the case may be)
prior to the cancellation, lapse or material adverse change of any insurance maintained pursuant to this Annex B. 
 F. Right to Pay Premiums

 The Additional Insureds shall have the rights but not the obligations of an additional named insured with respect to paying premiums.
None of Mortgagee and the other Additional Insured shall have any obligation to pay any premium, commission, assessment or call due on any such insurance (including reinsurance). Notwithstanding the foregoing, in the event of cancellation of any
insurance due to the nonpayment of premiums, Mortgagee shall have the option, in its sole discretion, to pay any such premium in respect of the Aircraft that is due in respect of the coverage pursuant to this Trust Indenture and to maintain such
coverage, as Mortgagee may require, until the scheduled expiry date of such insurance and, in such event, Owner shall, upon demand, reimburse Mortgagee for amounts so paid by them. 

G. Deductibles; Self-insurance 
 Owner (or
Permitted Lessee) may self-insure by way of deductible, premium adjustment or franchise provisions or otherwise (including, with respect to insurance maintained pursuant to Section B, insuring for a maximum amount which is less than the Debt
Balance) in the insurance covering the risks required to be insured against pursuant to Section 4.06 and this Annex B under a program applicable to all aircraft in Owner’s (or Permitted Lessee’s) fleet, but in no case shall the
aggregate amount of self-insurance in regard to Section 11 and this Annex B exceed during any policy year, with respect to all of the aircraft in Owner’s (or Permitted Lessee’s) fleet (including, without limitation, the
Aircraft), the lesser of (a) 100% of the largest replacement value of any single aircraft in Owner’s fleet and (b) 1-1/2% of the average aggregate insurable value (during the preceding policy
year) of all aircraft (including, without limitation, the Aircraft) on which Owner carries insurance, unless an insurance broker of national standing shall certify that the standard among all other major U.S. airlines is a higher level of
self-insurance, in which case Owner may self-insure to such higher level. In addition, Owner (and any Permitted Lessee) may self-insure to the extent of any applicable deductible per aircraft that does not exceed industry standards for major U.S.
airlines. 

  
 4 

 EXHIBIT A 

TO 
 TRUST INDENTURE AND MORTGAGE 

TRUST INDENTURE AND MORTGAGE SUPPLEMENT 

This TRUST INDENTURE AND MORTGAGE SUPPLEMENT NO.     , dated
[                ,     ] (herein called this “Trust Indenture Supplement”) of UNITED AIRLINES, INC., as Owner (the
“Owner”). 
 W I T N E S S E T H: 

WHEREAS, the Trust Indenture and Mortgage [            ], dated as of
[            ] (as amended and supplemented, the “Trust Indenture”), between the Owner and Wilmington Trust, National Association, as Mortgagee (the “Mortgagee”),
provides for the execution and delivery of a supplement thereto substantially in the form hereof, which shall particularly describe the Aircraft, and shall specifically mortgage such Aircraft to the Mortgagee; and 

WHEREAS, the Trust Indenture relates to the Airframe and Engines described below, and a counterpart of the Trust Indenture is attached hereto
and made a part hereof and this Trust Indenture Supplement, together with such counterpart of the Trust Indenture, is being filed for recordation on the date hereof with the FAA as one document; 

NOW, THEREFORE, this Trust Indenture Supplement WITNESSETH that the Owner hereby confirms that the Lien of the Trust Indenture on the
Collateral covers all of Owner’s right, title and interest in and to the following described property and that it hereby grants to the Security Trustee an “International Interest” (as defined in the Cape Town Convention on
International Interests in Mobile Equipment and related Aircraft Equipment Protocol, as in effect in the United States) in the following airframe and engines: 

AIRFRAME 
 One airframe identified as
follows: 
  

							
	 Manufacturer
	  	 Model
	  	 FAA Registration

Number
	  	 Manufacturer’s

Serial Number

	 The Boeing Company
	  		  		  	

 AIRCRAFT ENGINES 

Two aircraft engines, each such engine being a jet propulsion aircraft engine with at least 1750 lb of thrust or its equivalent,
identified as follows: 
  

					
	 Manufacturer
	  	 Manufacturer’s Model
	  	 Serial Number

 Together with all of Owner’s right, title and interest in and to (a) all Parts of
whatever nature, which from time to time are included within the definition of “Airframe” or “Engine”, whether now owned or hereafter acquired, including all substitutions, renewals and replacements of and additions,
improvements, accessions and accumulations to the Airframe and Engines (other than additions, improvements, accessions and accumulations which constitute appliances, parts, instruments, appurtenances, accessories, furnishings or other equipment
excluded from the definition of Parts) and (b) all Aircraft Documents. 
 TO HAVE AND TO HOLD all and singular the aforesaid property
unto the Mortgagee, its successors and assigns, in trust for the equal and proportionate benefit and security of the Note Holders and the Indenture Indemnitees, except as provided in Section 2.13 and Article III of the Trust Indenture without
any preference, distinction or priority of any one Equipment Note over any other by reason of priority of time of issue, sale, negotiation, date of maturity thereof or otherwise for any reason whatsoever, and for the uses and purposes and subject to
the terms and provisions set forth in the Trust Indenture. 
 This Trust Indenture Supplement shall be construed as supplemental to the
Trust Indenture and shall form a part thereof. The Trust Indenture is each hereby incorporated by reference herein and is hereby ratified, approved and confirmed. 

AND, FURTHER, the Owner hereby acknowledges that the Aircraft referred to in this Trust Indenture Supplement has been delivered to the Owner
and is included in the property of the Owner subject to the pledge and mortgage thereof under the Trust Indenture. 
 * * * 

IN WITNESS WHEREOF, the Owner has caused this Trust Indenture Supplement to be duly executed by one of its officers, thereunto duly
authorized, on the day and year first above written. 
  

			
	UNITED AIRLINES, INC.
		
	By:	 	  

		 	Name:
		 	Title:

  
 2 

 SCHEDULE I 
  

									
	 	  	Original
Amount	 	 	Interest
Rate	 
	 Series AA:
	  	 	[        	] 	 	 	3.50	% 
	 Series A:
	  	 	[        	] 	 	 	3.70	% 
	 Series B
	  	 	[        	] 	 	 	4.60	% 
	 Total:
	  				 			

 Trust Indenture and Mortgage 

Equipment Note Amortization 
  

			
	 Payment Date
	  	Percentage of
Original
Amount to
be Paid
	
	[Attached on following pages.]

 EXHIBIT D 

TO 
 NOTE PURCHASE AGREEMENT 

[Form of Opinion of Hughes Hubbard & Reed LLP] 

May [    ], 2018 
 To
the Persons Listed on Schedule I Attached Hereto 
  

	 	Re:	Note Purchase Agreement, dated as of February 14, 2018 (as amended by Amendment No. 1 to Note Purchase Agreement, dated as of the date hereof) 

Ladies and Gentlemen: 
 We have been requested by
United Airlines, Inc., a Delaware corporation (the “Company”), to act as special counsel with respect to, and to render this opinion letter in connection with, the issuance and sale of Series B Equipment Notes on the date hereof pursuant
to Section 10 of the Note Purchase Agreement, dated as of February 14, 2018 (the “Original Note Purchase Agreement”), as amended by Amendment No. 1 to Note Purchase Agreement, dated as of the date hereof (as so amended, the
“Note Purchase Agreement”), among (i) the Company, (ii) Wilmington Trust, National Association, a national banking association, not in its individual capacity, except as expressly provided therein, but solely as Class AA
Pass Through Trustee, Class A Pass Through Trustee and Class B Pass Through Trustee, (iii) Wilmington Trust, National Association, a national banking association, as Subordination Agent, (iv) U.S. Bank National Association, a
national banking association, as Escrow Agent and as Class B Escrow Agent, and (v) Wilmington Trust, National Association, a national banking association, as Paying Agent and as Class B Paying Agent. All capitalized terms used herein
and not otherwise defined herein shall have the respective meanings given to those terms in Annex A to the Note Purchase Agreement. 
 In
connection with this opinion letter we have examined, among other things, originals or copies certified or otherwise identified to our satisfaction of the following documents (the “Operative Documents”): 

 

	 	(i)	each Amended Indenture, without giving effect to the applicable Indenture Amendment; 

  

	 	(ii)	each Indenture Amendment applicable to each such Amended Indenture (the “Applicable Indenture Amendments”); 

	 	(iii)	each Amended Participation Agreement, without giving effect to the applicable PA Amendment; 

  

	 	(iv)	each PA Amendment applicable to each such Amended Participation Agreement (the “Applicable PA Amendments”); 

  

	 	(v)	the Series B Equipment Notes issued under each Amended Indenture, each in the principal amount relating to such Amended Indenture set forth on Schedule IV to the Note Purchase Agreement (the “Applicable Series B
Equipment Notes”); 

  

	 	(vi)	the Original Note Purchase Agreement; and 

  

	 	(vii)	the Amendment. 

 We have also examined and relied upon such other documents and such other
corporate records, certificates and other statements of governmental officials and corporate officers and other representatives of the Company as we have deemed necessary or appropriate for the purposes of this opinion. As to certain facts material
to the opinions expressed herein, we have relied upon representations and warranties contained in the Operative Documents. The opinions expressed herein are subject to the following exceptions, assumptions, qualifications and limitations: 

A. The opinions set forth below are limited to the laws of the State of New York, the federal laws of the United States of America and the
General Corporation Law of the State of Delaware, except that we express no opinion with respect to (i) the laws, regulations or ordinances of any county, town or municipality or governmental subdivision or agency thereof, (ii) state
securities or blue sky laws or federal securities laws, including the Securities Act of 1933, as amended (the “Securities Act”) and the Investment Company Act of 1940, as amended, (iii) any federal or state tax, antitrust or
fraudulent transfer or conveyance laws, (iv) the Employee Retirement Income Security Act of 1974, as amended, or (v) the Act (except as expressly provided in paragraph 5 below), the Cape Town Convention on International Interests in
Mobile Equipment and the related Aircraft Equipment Protocol, as in effect in the United States, or any other laws, rules or regulations governing, regulating or relating to the acquisition, ownership, registration, use or sale of any aircraft,
airframe or aircraft engine or to the particular nature of the Collateral (as defined in and applicable to an Amended Indenture, the “Applicable Collateral”). In addition, our opinions are based upon a review of those laws, statutes, rules
and regulations which, in our experience, are normally applicable to transactions of the type contemplated by the Operative Documents. 
 B.
The opinions set forth in paragraph 3 below are subject to (i) limitations on enforceability arising from applicable bankruptcy, insolvency, reorganization, moratorium, receivership, fraudulent conveyance, fraudulent transfer, preferential
transfer and similar laws relating to or affecting the rights and remedies of creditors generally and the effect of general principles of equity, including, without limitation, laches and estoppel as equitable defenses and concepts of materiality,
reasonableness, good faith and fair dealing (regardless of whether such enforceability is considered or applied in a proceeding in equity or at law) and considerations of impracticability or impossibility of performance, and defenses based upon
unconscionability of 

  
 2 

 
otherwise enforceable obligations in the context of the factual circumstances under which enforcement thereof is sought and (ii) the qualification that the remedy of specific performance and
injunctive and other forms of equitable relief may be subject to equitable defenses and to the discretion of the court before which any proceeding therefor may be brought. In addition, certain remedial and procedural provisions of the Transaction
Documents (as defined in paragraph 2 below) are or may be unenforceable in whole or in part, but the inclusion of such provisions does not affect the validity of those agreements and does not, in our opinion, make the remedies provided in those
agreements, or otherwise available under applicable law, inadequate for the practical realization of the substantive benefits purported to be provided thereby, except for the economic consequences resulting from any delay imposed by, or any
procedure required by, applicable laws, rules, regulations and by constitutional requirements. We express no opinion as to (i) any provision contained in any Operative Document (a) providing for indemnification or exculpation of any Person
for such Person’s gross negligence, willful misconduct, recklessness or unlawful conduct or in respect of liabilities under the Securities Act, (b) providing for a premium, late payment charges or an increase in interest rate upon
delinquency in payment or the occurrence of a default or other specified event but only to the extent such provision is deemed to constitute a penalty or liquidated damages provision, (c) as such provision relates to the subject matter
jurisdiction of federal courts or the waiver of inconvenient forum with respect to proceedings in federal courts, (d) that purports to establish (or may be construed to establish) evidentiary standards, (e) providing for the waiver of any
statutory right or any broadly or vaguely stated rights or unknown future rights, or any waiver which is against public policy considerations or (f) providing for severability of the provisions of an Operative Document or (ii) Section
12.8(e) of each Amended Participation Agreement or any comparable provision of any other Operative Document. Under certain circumstances the requirement that the provisions of an Operative Document may be modified or waived only in writing or only
in a specific instance and provisions to the effect that failure or delay in exercising any right, remedy, power and/or privilege will not impair or waive such right, remedy, power and/or privilege may be unenforceable to the extent that an oral
agreement has been effected or a course of dealing has occurred modifying such provisions. A court may modify or limit contractual agreements regarding attorneys’ fees. 

C. To the extent that our opinions expressed herein involve conclusions as to the matters set forth in the opinions dated the date hereof of
the United Airlines, Inc. Legal Department, Morris James LLP or Lytle, Soulé & Curlee being delivered to you on the date hereof pursuant to the Note Purchase Agreement, we have assumed, without independent investigation, the correctness
of the matters set forth in such opinions. 
 D. We have assumed the due authorization, execution and delivery of the Operative Documents by
each of the parties thereto, that each of such parties (other than the Company) has the power and authority to execute, deliver and perform each such Operative Document and has obtained or made all necessary consents, approvals, filings and
registrations in connection therewith (except any required under New York law by the Company), that such execution, delivery and performance does not violate its charter, by-laws or similar instrument, that
each Amended Indenture and Amended Participation Agreement has not been amended, supplemented, modified or terminated (except for (i) the Applicable Indenture Amendment and 

  
 3 

 
Applicable PA Amendment and (ii) in the case of each Amended Indenture, Trust Indenture Supplement No. 1 thereto, dated the applicable Closing Date (as defined in such Amended
Indenture)), that value has been given to the Company at the Closing (as defined in and applicable to an Amended Indenture, the “Applicable Closing”) by the purchaser of Equipment Notes (other than Series B) issued under each Amended
Indenture at the Applicable Closing and by the Class B Pass Through Trustee pursuant to Section 10(v) of the Note Purchase Agreement, that the Company had rights in the Applicable Collateral at the Applicable Closing for each Amended
Indenture and that WTNA is duly organized, validly existing and in good standing in its jurisdiction of organization and qualified to transact business in each other jurisdiction where such qualification is required. 

E. We have assumed the due authentication of the Applicable Series B Equipment Notes by the Loan Trustee and the delivery thereof against
payment therefor, all in accordance with the Note Purchase Agreement and each Amended Indenture. 
 F. We have assumed that all signatures on
documents examined by us are genuine, that all persons signing such documents have legal capacity, that all documents submitted to us as originals are authentic and that all documents submitted to us as copies or specimens conform with the
originals, which facts we have not independently verified. 
 G. We have assumed that each Financed Aircraft has been registered in the name
of the Company with the FAA pursuant to the Act, that the “FAA Filed Documents” as defined in each Amended Indenture have been filed with and recorded by the FAA in accordance with the Act, that the “Financing Statements” as
defined in each Amended Indenture have been filed as contemplated by Section 4.1.11 of each Amended Participation Agreement and that such “FAA Filed Documents” (except for the amendments and supplements to the Amended Indentures
referred to in paragraph D above) and “Financing Statements” have not been amended, supplemented, modified or terminated. 
 H. We
express no opinion as to any provision in any Operative Document that is contrary to Sections 9-401, 9-406, 9-407 or 9-408 or Part VI of Article 9, of the UCC. We have not made any examination of, and express no opinion with respect to (and to the extent relevant have assumed the accuracy and sufficiency of), (i) descriptions
of, the legal or beneficial ownership of, or the title or condition of title to, any Applicable Collateral or any other property covered by any of the Operative Documents, (ii) except as expressly set forth in paragraphs 5 and 7 below, the
existence, creation, validity or attachment of any Lien (as defined in the Amended Indentures) thereon, (iii) except as expressly set forth in paragraph 5 below, the perfection of any Lien thereon and (iv) the priority or enforcement of
any Lien thereon. 
 I. In giving an opinion regarding the valid existence and good standing of the Company, we have relied solely upon
certificates of public officials. 
 J. We have assumed that on each “Closing Date” (as defined in each Amended Indenture) the
Company held, and on the date hereof the Company holds, an air carrier operating certificate issued pursuant to Chapter 447 of Title 49 of the United States Code for aircraft capable of carrying 10 or more individuals or 6,000 pounds or more of
cargo. 

  
 4 

 K. The opinions expressed herein are given as of the date hereof. We assume no obligation to
advise you of any facts or circumstance that may come to our attention, or any changes in law that may occur after the date hereof, which may affect the opinion expressed herein. 

Based on and subject to the foregoing, we are of the opinion that: 

1. The Company is a corporation duly incorporated, validly existing and in good standing under the laws of the State of Delaware. 

2. The Company has all necessary corporate power to execute and deliver each Applicable PA Amendment, each Applicable Indenture Amendment and
each Applicable Series B Equipment Note (collectively, the “Company Documents”) and to perform its obligations under each Company Document, each Amended Participation Agreement and each Amended Indenture (collectively, the
“Transaction Documents”). Neither the execution nor the delivery of the Company Documents by the Company nor the consummation by the Company of the transactions contemplated by the Transaction Documents will result in any violation of
(a) its Amended and Restated Certificate of Incorporation or Amended and Restated By-laws, (b) the Amended Indentures (without giving effect to the Applicable Indenture Amendments) or (c) any
law, governmental rule or regulation known to us to be applicable to, or binding on, the Company, or requires the approval of the stockholders of the Company. 

3. Each Transaction Document constitutes the valid and binding obligation of the Company and is enforceable against the Company in accordance
with its terms. 
 4. Except for the matters referred to in clauses (i) and (ii) of paragraph 5 below, no approval, authorization
or other action by or filing with any governmental authority is required for the execution and delivery by the Company of the Company Documents or the Amendment or the consummation by the Company of the transactions contemplated by the Company
Documents or the Amendment to occur on the Class B Issuance Date. 
 5. Except for (i) the filing and recordation in accordance
with the Act of the Applicable Indenture Amendment with respect to each Amended Indenture and the periodic renewal of the registration of the Financed Aircraft in the name of the Company under the Act prior to its expiration and (ii) the filing
of continuation statements to continue effectiveness of the “Financing Statements” (as defined in each Amended Indenture), and assuming that at the time of such filing under the Act no other unrecorded document relating to the Financed
Aircraft corresponding to such Amended Indenture on Schedule IV to the Note Purchase Agreement has been filed pursuant to the Act, (a) no further filing or recording of any document is necessary (x) to establish the Company’s title to
such Financed Aircraft, and (y) to create a valid security interest in the Company’s interest as owner of such Financed Aircraft in favor of the Loan Trustee pursuant to such Amended Indenture and (b) no further filing or recording of
any document in the State of New York or under the Act is required to perfect a security interest in the Company’s interest as owner of such Financed Aircraft in favor of the Loan Trustee pursuant to such Amended Indenture. 

  
 5 

 6. The Loan Trustee under each Amended Indenture will be entitled to the benefits of
Section 1110 of Title 11 of the United States Code with respect to the Financed Aircraft subject to the security interest created under such Amended Indenture in connection with any case commenced by or against the Company under
Chapter 11 of Title 11 of the United States Code. 
 7. Each Amended Indenture has created a valid security interest in favor of
the Loan Trustee, as trustee for the benefit of the holders of Equipment Notes issued thereunder and, to the extent provided therein, the Related Equipment Notes (as defined in such Amended Indenture), in the Applicable Collateral to the extent that
the UCC (as defined in such Amended Indenture) applies to a security interest in such property. 
 This opinion is being delivered pursuant
to Section 11(i)(2)(A) of the Note Purchase Agreement. This opinion may be relied upon by you (and any permitted Transferee under Section 9.1 of each Amended Participation Agreement) in connection with the matters set forth herein and,
without our prior written consent, may not be relied upon for any other purpose and may not be furnished to any other Person for any purpose. 

Very truly yours, 
  

  
 6 

 SCHEDULE I 

Credit Suisse Securities (USA) LLC 
 Citigroup Global Markets
Inc. 
 Goldman Sachs & Co. LLC 
 Deutsche Bank
Securities Inc. 
 Morgan Stanley & Co. LLC 

Barclays Capital Inc. 
 Merrill Lynch, Pierce, Fenner &
Smith Incorporated 
 BNP Paribas Securities Corp. 
 Credit
Agricole Securities (USA) Inc. 
 J.P. Morgan Securities LLC 

Standard Chartered Bank 
 Wells Fargo Securities, LLC 

Wilmington Trust, National Association, as Loan Trustee under each Amended Indenture, Subordination Agent, Class AA Pass Through Trustee, Class A
Pass Through Trustee and Class B Pass Through Trustee 
 National Australia Bank Limited, acting through its New York Branch, as Liquidity Provider
under the Liquidity Facilities and under the Class B Liquidity Facility 
 Moody’s Investors Service, Inc. 

Fitch Ratings, Inc. 

 EXHIBIT E 

TO 
 NOTE PURCHASE AGREEMENT 

[Form of Opinion of United Airlines, Inc. Legal Department] 

May [    ], 2018 

To the Persons Listed on Schedule I Attached Hereto 
  

	 	Re:	Note Purchase Agreement, dated as of February 14, 2018 (as amended by Amendment No. 1 to Note Purchase Agreement, dated as of the date hereof) 

Ladies and Gentlemen: 
 This opinion letter is
being delivered by United Airlines, Inc., a Delaware corporation (“United”), through its Legal Department in connection with the issuance and sale of Series B Equipment Notes on the date hereof pursuant to Section 10 of the Note
Purchase Agreement, dated as of February 14, 2018 (the “Original Note Purchase Agreement”), as amended by Amendment No. 1 to Note Purchase Agreement, dated as of the date hereof (as so amended, the “Note Purchase
Agreement”), among (i) the Company, (ii) Wilmington Trust, National Association, a national banking association, not in its individual capacity, except as expressly provided therein, but solely as Class AA Pass Through Trustee,
Class A Pass Through Trustee and Class B Pass Through Trustee, (iii) Wilmington Trust, National Association, a national banking association, as Subordination Agent, (iv) U.S. Bank National Association, a national banking
association, as Escrow Agent and as Class B Escrow Agent, and (v) Wilmington Trust, National Association, a national banking association, as Paying Agent and as Class B Paying Agent. All capitalized terms used herein and not otherwise
defined herein shall have the respective meanings given those terms in Annex A to the Note Purchase Agreement. This opinion letter is being furnished to you pursuant to Section 11(i)(2)(B) of the Note Purchase Agreement. 

In giving the following opinions, members of United’s Legal Department or lawyers retained by United’s Legal Department have
reviewed, among other things, originals or copies certified or otherwise identified to our satisfaction of the following documents: 
  

	 	(i)	each Amended Indenture, without giving effect to the applicable Indenture Amendment; 

  

	 	(ii)	each Indenture Amendment applicable to each such Amended Indenture (the “Applicable Indenture Amendments”); 

  

	 	(iii)	each Amended Participation Agreement, without giving effect to the applicable PA Amendment; 

	 	(iv)	each PA Amendment applicable to each such Amended Participation Agreement (the “Applicable PA Amendments”); 

  

	 	(v)	the Series B Equipment Notes issued under each Amended Indenture, each in the principal amount relating to such Amended Indenture set forth on Schedule IV to the Note Purchase Agreement (the “Applicable Series B
Equipment Notes”); 

  

	 	(vi)	the Original Note Purchase Agreement; 

  

	 	(vii)	the Amendment; and 

  

	 	(viii)	such other records, documents, certificates and instruments as in our judgment are necessary or appropriate to enable us to render the opinions expressed below. 

In addition, United’s Legal Department has assumed and has not verified the accuracy as to factual matters of each document reviewed. As used herein, the
phrase “to our knowledge” or words of similar import shall mean to the actual knowledge of members of United’s Legal Department after reasonable investigation, but shall not be interpreted to impute to any member of United’s
Legal Department knowledge of others. 
 Based on the foregoing, and subject to the assumptions and limitations contained herein,
United’s Legal Department is of the opinion that: 
 (a) United is an “air carrier” within the meaning of Section 40102
of the Act, is a “citizen of the United States” as such term is defined in Section 40102 of such Act and holds all authority, necessary licenses and certificates under the Act and the rules and regulations promulgated thereunder
necessary for the conduct of its business and to perform its obligations under the Transaction Documents (as defined below). United holds, and on each “Closing Date” (as defined in each Amended Indenture) United held, an air carrier
operating certificate issued pursuant to Chapter 447 of Title 49 of the United States Code for aircraft capable of carrying 10 or more individuals or 6,000 pounds or more of cargo. 

(b) The execution and delivery by United of each of the Applicable Indenture Amendments, the Applicable PA Amendments and the Applicable Series
B Equipment Notes (collectively, the “Company Documents”) and the performance by United of its obligations under the Company Documents, the Amended Indentures and the Amended Participation Agreements (collectively, the “Transaction
Documents”) do not, to our knowledge, breach or result in a default under any indenture, mortgage, deed of trust, credit agreement, conditional sale contract or other loan agreement to which United is a party or by which United or its property
may be bound. 
 (c) The execution and delivery by United of each of the Company Documents and the performance by United of its obligations
under the Transaction Documents have been duly authorized by all necessary corporate action on the part of United, and each of the Company Documents has been duly executed and delivered by United. 

(d) There are no pending or, to our knowledge, threatened actions, suits or proceedings before any court or administrative agency or arbitrator
that question the validity of any of the Transaction Documents or that would have been required to be disclosed in United’s Annual Report on Form 10-K filed for the year ended December 31, 2017, or
any subsequent Quarterly Report on Form 10-Q or Current Report on Form 8-K (or amendment to any of the foregoing), except such as are therein disclosed. 

  
 2 

 The foregoing opinions are limited to the federal law of the United States of America (other than
(i) the Act (except as expressly provided in paragraph (a) above), the Cape Town Convention on International Interests in Mobile Equipment and the related Aircraft Equipment Protocol, as in effect in the United States, or any other laws,
rules or regulations governing, regulating or relating to the acquisition, ownership, registration, use or sale of an aircraft, airframe or aircraft engine or to the particular nature of the Collateral (as defined in the Amended Indentures), (ii)
federal securities laws, and (iii) federal tax, antitrust or fraudulent transfer or conveyance laws, as to which we express no opinion), the General Corporation Law of the State of Delaware and the law of the State of Illinois (other than state
securities or blue sky laws, or state tax, antitrust or fraudulent transfer or conveyance laws, as to which we express no opinion). 
 This
opinion letter is furnished to you for the purpose indicated above, and may not be relied upon by any other Person (except any permitted Transferee under Section 9.1 of each Participation Agreement) or for any other purpose without our written
consent. 

                          
                                         
                     Very truly yours, 

                          
                                         
                     United Airlines, Inc. 

                          
                                         
                     Legal Department 

  
 3 

 SCHEDULE I 

Credit Suisse Securities (USA) LLC 
 Citigroup Global Markets
Inc. 
 Goldman Sachs & Co. LLC 
 Deutsche Bank
Securities Inc. 
 Morgan Stanley & Co. LLC 

Barclays Capital Inc. 
 Merrill Lynch, Pierce, Fenner &
Smith Incorporated 
 BNP Paribas Securities Corp. 
 Credit
Agricole Securities (USA) Inc. 
 J.P. Morgan Securities LLC 

Standard Chartered Bank 
 Wells Fargo Securities, LLC 

Wilmington Trust, National Association, as Loan Trustee under each Amended Indenture, Subordination Agent, Class AA Pass Through Trustee, Class A
Pass Through Trustee and Class B Pass Through Trustee 
 National Australia Bank Limited, acting through its New York Branch, as Liquidity Provider
under the Liquidity Facilities and under the Class B Liquidity Facility 
 Moody’s Investors Service, Inc. 

Fitch Ratings, Inc. 

 EXHIBIT F TO NOTE PURCHASE AGREEMENT 

May 23, 2018 
 To Each of the Parties Listed

   on Schedule A Attached Hereto 

Re: United Airlines Pass Through Certificates, Series 2018-1B 

Ladies and Gentlemen: 
 We have acted as counsel
to Wilmington Trust, National Association, a national banking association (in its individual capacity, “Wilmington Trust”, in its capacity as Loan Trustee under the Intercreditor Agreement, Pass Through Trustee under each Indenture and
Subordination Agent and trustee with respect to the Class AA Trust, the Class A Trust and the Class B Trust, the “Trustee”), in connection with the transactions contemplated by a Pass Through Trust Agreement, dated as of
October 3, 2012, between Wilmington Trust, National Association, as Trustee and United Airlines, Inc. (formerly known as Continental Airlines, Inc.) (“United”) (the “Basic Agreement”), as supplemented by the Trust Supplement
No. 2018-1B-O and Trust Supplement 2018-1B-S, each dated as of May 23, 2018, between
United and the Trustee (the “Trust Supplements”, together with the Basic Agreement, as so supplemented, the “Pass Through Trust Agreement”). This opinion is furnished pursuant to Section 3(d) of the Underwriting Agreement,
dated May 9, 2018 (the “Underwriting Agreement”), among United, Citibank, N.A., as depositary, and Credit Suisse Securities (USA) LLC and Citigroup Global Markets Inc., as representatives of the several underwriters named therein, and
Section 11(i)(2)(C) of the Note Purchase Agreement, dated as of February 14, 2018 (the “Original Note Purchase Agreement”), as amended by Amendment No. 1 to Note Purchase Agreement (the “NPA Amendment”), dated as
of the date hereof (as so amended, the “Note Purchase Agreement”), among United, the Trustee, U.S. Bank National Association, as Escrow Agent and as Class B Escrow Agent, and Wilmington Trust, as Paying Agent and as Class B
Paying Agent. Capitalized terms used herein and not otherwise defined are used as defined in the Underwriting Agreement or the Note Purchase Agreement, except that reference herein to any documents shall mean such document as in effect as of the
date hereof. 
 We have examined executed counterparts of the following documents: 

 

	 	(a)	the Pass Through Trust Agreement; 

  

	 	(b)	the Intercreditor Agreement; 

  

	 	(c)	the Liquidity Facility; 

 To Each of the Parties Listed 

  on Schedule A Attached Hereto 
 May 23, 2018 

Page 2 
  

	 	(d)	each Indenture, without giving effect to the applicable Indenture Amendment; 

  

	 	(e)	each Indenture Amendment applicable to each such Indenture; 

  

	 	(f)	each Participation Agreement, without giving effect to the applicable PA Amendment; 

  

	 	(g)	each PA Amendment applicable to each such Participation Agreement; 

  

	 	(h)	the Original Note Purchase Agreement; 

  

	 	(i)	the NPA Amendment (the documents listed in (a) through (i) are collectively referred to herein as the “Transaction Documents”); 

 

	 	(j)	the Underwriting Agreement; 

  

	 	(k)	(1) The Registration Statement on Form S-3 (Registration No. 333-221865), filed by United and United Continental Holdings, Inc. under
the Securities Act of 1933, as amended, and the rules and regulations thereunder (the “Securities Act”), with the Securities and Exchange Commission on December 1, 2017, including the exhibits thereto and the documents filed by United
and United Continental Holdings, Inc. with the Securities and Exchange Commission pursuant to the Securities Exchange Act of 1934, as amended, that are incorporated by reference therein and also including the information (if any) deemed to be part
of the registration statement at the time of effectiveness pursuant to Rule 430B under the Securities Act, (2) the basic prospectus dated December 1, 2017, related to pass through certificates included in the Registration Statement,
(3) the preliminary prospectus supplement of United dated May 9, 2018, relating to the Class B Certificates in the form filed pursuant to Rule 424(b) under the Securities Act, including the documents incorporated by reference therein,
(4) the free writing prospectuses, identified in Schedule IV to the Class B Underwriting Agreement, and (5) the final prospectus supplement of United dated May 9, 2018, relating to the Class B Certificates in the form filed
pursuant to Rule 424(b) under the Securities Act, including the documents incorporated by reference therein; 

  

	 	(l)	the Class B Certificates being issued today in definitive form; and 

  

	 	(m)	the Series B Equipment Notes issued under each Indenture, each in the principal amount relating to such Indenture set forth on Schedule IV to the Note Purchase Agreement. 

  

 To Each of the Parties Listed 

  on Schedule A Attached Hereto 
 May 23, 2018 

Page 3 
  

 We have also examined originals or copies of such other documents and such corporate records,
certificates and other statements of governmental officials and corporate officers and other representatives of the corporations or entities referred to herein as we have deemed necessary or appropriate for the purposes of this opinion. Moreover, as
to certain facts material to the opinions expressed herein, we have relied upon the representations and warranties contained in the documents referred to in this paragraph. 

Based upon the foregoing and upon an examination of such questions of law as we have considered necessary or appropriate, and subject to the
assumptions, exceptions and qualifications set forth below, we advise you that, in our opinion: 
 1. Wilmington Trust is a national banking
association duly organized and validly existing in good standing under the laws of the United States of America, and has the corporate power and authority to execute, deliver and perform its obligations under, in its individual capacity, or as
Trustee, as the case may be, the Transaction Documents and the Class B Certificates. Wilmington Trust is a “citizen of the United States” as defined in 49 U.S.C. § 40102. 

2. Each of the Transaction Documents has been duly authorized, executed and delivered by Wilmington Trust in its individual capacity, or as
Trustee, as the case may be, and constitutes a legal, valid and binding obligation of Wilmington Trust in its individual capacity, or as Trustee, as the case may be, enforceable against Wilmington Trust in its individual capacity, or as Trustee, as
the case may be, in accordance with its terms. The Pass Through Trust Agreement is a legal, valid and binding obligation of the Class B Trust, enforceable against the Class B Trust in accordance with its terms. 

3. Wilmington Trust, solely in its capacity as Trustee, has duly authorized, issued, executed and delivered the Class B Certificates to
the Certificateholders (as defined in the Basic Agreement) thereof pursuant to the terms and provisions of the Pass Through Trust Agreement. The Class B Certificates are duly authorized, legal, valid and binding obligations of the Class B
Trust, enforceable against the Class B Trust in accordance with their terms and the terms of the Pass Through Trust Agreement and are entitled to the benefits of the Pass Through Trust Agreement. 

4. No authorization, consent or approval of, notice to or filing with, or the taking of any other action in respect of, any governmental
authority or agency of the United States or the State of Delaware governing the trust powers of Wilmington Trust is required for the execution, delivery or performance by Wilmington Trust in its individual capacity, or as Trustee, as the case may
be, of the Transaction Documents or the Class B Certificates. 

  

 To Each of the Parties Listed 

  on Schedule A Attached Hereto 
 May 23, 2018 

Page 4 
  

 5. Neither the execution, delivery or performance by Wilmington Trust in its individual
capacity, or as Trustee, as the case may be, of the Transaction Documents or the Class B Certificates, nor compliance with the terms and provisions thereof, conflicts with the charter or bylaws of Wilmington Trust or results in a breach or
violation of any of the terms, conditions or provisions of any law, governmental rule or regulation of the United States or the State of Delaware governing the trust powers of Wilmington Trust or, to our knowledge, any order, writ, injunction or
decree of any court or governmental authority against Wilmington Trust or by which it or any of its properties is bound or, to our knowledge, any indenture, mortgage, contract or other agreement or instrument to which Wilmington Trust is a party or
by which it or any of its properties is bound, or constitutes a default thereunder. 
 6. Assuming that the Class B Trust (as defined in
the Intercreditor Agreement) will not be taxable as a corporation, but, rather, will be classified as a grantor trust under subpart E, Part I of Subchapter J of the United States Internal Revenue Code of 1986, as amended (the “Code”), or
as a partnership under Subchapter K of the Code (i) the Class B Trust will not be subject to any tax (including, without limitation, net or gross income, tangible or intangible property, net worth, capital, franchise or doing business
tax), fee or other governmental charge under the laws of the State of Delaware or any political subdivision thereof and (ii) the Certificateholders that are not residents of or otherwise subject to tax in Delaware will not be subject to any tax
(including, without limitation, net or gross income, tangible or intangible property, net worth, capital, franchise or doing business tax), fee or other governmental charge under the laws of the State of Delaware or any political subdivision thereof
as a result of purchasing, holding (including receiving payments with respect to) or selling a Class B Certificate. 
 7. To our
knowledge, there are no proceedings pending or threatened against or affecting Wilmington Trust in any court or before any governmental authority, agency, arbitration board or tribunal which, if adversely determined, individually or in the
aggregate, would materially and adversely affect any Trust (as defined in the Intercreditor Agreement) or question the right, power and authority of Wilmington Trust in its individual capacity, or as Trustee, as the case may be, to enter into or
perform its obligations under the Transaction Documents or which would call into question or challenge the validity of any of the Transaction Documents or the enforceability thereof. 

8. Each of the Series B Equipment Notes (as defined in the Note Purchase Agreement) to be delivered to and registered in the name of the
Subordination Agent pursuant to the Financing Agreements (as defined in the Intercreditor Agreement) and the Intercreditor Agreement will be held by the Subordination Agent in trust as trustee for the Trustee under the Pass Through Trust Agreement
on behalf of the Certificateholders of the Class B Trust. 
 The foregoing opinions are subject to the following assumptions,
exceptions and qualifications: 

 To Each of the Parties Listed 

  on Schedule A Attached Hereto 
 May 23, 2018 

Page 5 
  

 A. We are admitted to practice law in the State of Delaware and do not hold ourselves out as
being experts on the law of any other jurisdiction. The foregoing opinions are limited to the laws of the State of Delaware and the federal laws of the United States of America governing the banking and trust powers of Wilmington Trust (except that
we express no opinion with respect to (i) federal securities laws, including, without limitation, the Securities Act of 1933, as amended, the Trust Indenture Act of 1939, as amended, and the Investment Company Act of 1940, as amended, or
(ii) state securities or blue sky laws). Insofar as the foregoing opinions relate to the validity and enforceability of the Transaction Documents expressed to be governed by the laws of the State of New York, we have assumed that each such
document is legal, valid, binding and enforceable in accordance with its terms under such laws (as to which we express no opinion). 
 B. The
foregoing opinions regarding enforceability are subject to (i) applicable bankruptcy, insolvency, moratorium, receivership, reorganization, fraudulent conveyance and similar laws relating to or affecting the rights and remedies of creditors
generally or (ii) principles of equity (regardless of whether considered and applied in a proceeding in equity or at law). 
 C. We have
assumed the due authorization, execution and delivery by each of the parties thereto (other than Wilmington Trust in its individual capacity, or as Trustee, as the case may be) of the Transaction Documents, that each of such parties has the full
power, authority and legal right to execute, deliver and perform each such document. 
 D. We have assumed that all signatures (other than
those of Wilmington Trust in its individual capacity, or as Trustee, as the case may be) on documents examined by us are genuine, that all documents submitted to us as originals are authentic and that all documents submitted to us as copies or
specimens conform with the originals, which facts we have not independently verified. 
 E. The opinions expressed in paragraph 7 above
regarding any pending litigation or court order with respect to the Trusts are limited solely to our search as of the date hereof of public records of the Chancery Court of the State of Delaware in and for New Castle County, the Superior Court of
the State of Delaware in and for New Castle County and the United States District Court for the District of Delaware. 
 F. We have not
participated in the preparation of any offering materials with respect to the Class B Certificates and assume no responsibility for their contents. 

G. In basing the opinions set forth herein on “our knowledge,” the words “our knowledge” signify that no information has
come to the attention of the attorneys in the firm who are directly involved in the representation of Wilmington Trust in this transaction that would give us actual knowledge that any such opinions are not accurate. Except as otherwise stated
herein, we have undertaken no independent investigation or verification of such matters. 

 To Each of the Parties Listed 

  on Schedule A Attached Hereto 
 May 23, 2018 

Page 6 
  

 This opinion may be relied upon by you in connection with the matters set forth herein. We
also consent to the reliance upon this opinion as to matters of Delaware law by Hughes Hubbard & Reed LLP and Milbank, Tweed, Hadley & McCloy LLP as if it were addressed to them, in rendering their opinions to you of even date
herewith. Except as stated above, without our prior written consent, this opinion may not be furnished or quoted to, or relied upon by, any other person or entity for any purpose. 

Very truly yours, 
 LCL/pab

 SCHEDULE A 

United Airlines, Inc. 
 Credit Suisse Securities (USA) LLC 

Citigroup Global Markets Inc. 
 Goldman Sachs & Co. LLC

 Deutsche Bank Securities Inc. 
 Morgan Stanley &
Co. LLC 
 Barclays Capital Inc. 
 Merrill Lynch, Pierce,
Fenner & Smith Incorporated 
 BNP Paribas Securities Corp. 

Credit Agricole Securities (USA) Inc. 
 J.P. Morgan Securities
LLC 
 Standard Chartered Bank 
 Wells Fargo Securities,
LLCWilmington Trust, National Association, as Loan Trustee under each Amended Indenture, Subordination Agent, Class AA Pass Through Trustee, Class A Pass Through Trustee and Class B Pass Through Trustee 

National Australia Bank Limited, acting through its New York Branch, as Liquidity Provider under the Liquidity Facilities and under the Class B Liquidity
Facility 
 Moody’s Investors Service, Inc. 
 Fitch
Ratings, Inc. 

 EXHIBIT G TO NOTE PURCHASE AGREEMENT 

 

					
	LYTLE SOULÉ & CURLEE
			
	 MICHAEL C. FELTY*E
 SHAWN E. ARNOLD

GORE GAINES
 JASON C. HASTY

                         
       
  
 STAN A. KOOP

ROBERT RAY JONES, JR.

                         
       
  
 DAVID W. KIRK (1957-2017)
	  	 A PROFESSIONAL CORPORATION

EST. JANUARY 1, 1902

ATTORNEYS & COUNSELORS

1200 ROBINSON RENAISSANCE
 119 NORTH
ROBINSON
 OKLAHOMA CITY, OKLAHOMA 73102

PHONE (405) 235-7471

FAX (405) 232-3852

www.lytlesoule.net
  

May     , 2018
	  	 MATTHEW J.G. McDEVITT*

MATTHEW K. FELTY
 STACEY
S. CHUBBUCK
 CHANTEL P. JAMES

JEFFREY C. CARTMELL

                          
                      
  

RICHARD M. HEALY, III

STEVEN K. MULLINS
 OF
COUNSEL
  
 *Also admitted in Texas

EAlso admitted in U.S. Patent Office

  

	 	Re:	Boeing model         -         (described as model     -     on the
International Registry) aircraft with manufacturer’s serial number              and United States nationality and registration marks N (the
“Aircraft”)  

 To the Addressees Listed on 

the Attached Exhibit A 
 Ladies and Gentlemen: 

Acting as special legal counsel in connection with the transactions contemplated by the instruments described below, this opinion is furnished
to you with respect to: (i) registering interests with the International Registry (the “International Registry”) created pursuant to and in accordance with the provisions of the Convention on International Interests in Mobile
Equipment, the Protocol to the Convention on International Interests in Mobile Equipment on Matters Specific to Aircraft equipment, both signed in Cape Town, South Africa on November 16, 2001, together with the Regulations for the International
Registry, the International Registry Procedures, and all other rules, amendments, supplements, revisions thereto (collectively the “Cape Town Treaty”), all as in effect on this date in the United States of America, as a Contracting State,
as defined in the Cape Town Treaty (a “Contracting State”), and the requirements of Title 49 of the United States Code (the “Transportation Code”); and (ii) pertaining to the recordation of instruments and the registration
of aircraft pursuant to the Transportation Code and the continued validity of interests under the Cape Town Treaty and the Transportation Code. 

This letter confirms that we filed with the Federal Aviation Administration (the “FAA”) today at
    :         .M., C.D.T., Amendment No. 1 to Trust Indenture and Mortgage              dated as of
this date (the “Indenture Amendment”) between United Airlines, Inc. (the “Owner”) and Wilmington Trust, National Association, as Mortgagee (the “Mortgagee”) amending Trust Indenture and Mortgage
             dated as of                 , 201    , by the Owner in
favor of the Mortgagee, as supplemented by Trust Indenture and Mortgage Supplement No. 1 dated                 , 201    , recorded
by the FAA on                         , 201    , as Conveyance No.
             (the “Trust Indenture”) covering the Aircraft and the two              model
             (described as model              on the International Registry) aircraft engines with
manufacturer’s serial numbers          and          (the “Engines”). 

 Page 2 
  

 Based upon our examination of the above-described instruments and of such records of the FAA
and the Priority Search Certificates (the “Priority Search Certificates”) issued by the International Registry as we deemed necessary to render this opinion and as were made available to us by the FAA and the International Registry, it is
our opinion that: 
  

	 	(a)	based on the type certificate data sheets issued by the FAA, the Aircraft and the Engines constitute “aircraft objects” as defined by the Cape Town Treaty; 

 

	 	(b)	the Indenture Amendment is in due form for recording and has been duly filed for recordation with the FAA pursuant to and in accordance with the provisions of the Transportation Code; 

 

	 	(c)	the Owner is owner of legal title to the Aircraft, with a Certificate of Aircraft Registration duly issued to the Owner with an expiration date of
                    , pursuant to and in accordance with the provisions of the Transportation Code; 

 

	 	(d)	the Aircraft and the Engines are free and clear of all Liens (as such term is defined in the Trust Indenture) of record with the FAA except the security interest created by the Trust Indenture, as amended by the
Indenture Amendment; 

  

	 	(e)	the interest created pursuant to and recognized by the Cape Town Treaty in the Trust Indenture, as amended by the Indenture Amendment (the “Indenture International Interest”), constitutes an International
Interest as defined in the Cape Town Treaty with respect to the Aircraft and the Engines; 

  

	 	(f)	based on the Priority Search Certificate No.                  dated this date as issued by the International Registry attached
hereto as Exhibit B, the Aircraft is subject to: (i) the Indenture International Interest assigned International Registry File No.             ; and (ii) Sale dated
                        , by The Boeing Company as seller to the Owner as buyer (the “Sale”) assigned
International Registry File No.             ; 

  

	 	(g)	based on the Priority Search Certificate No.                  dated this date as issued by the International Registry attached
hereto as Exhibit C, Engine              is subject to: (i) the Indenture International Interest assigned International Registry File No.
        ; and (ii) the Sale assigned International Registry File No.                     ;

  

	 	(h)	based on the Priority Search Certificate No.              dated this date as issued by the International Registry attached hereto as Exhibit D, Engine
             is subject to: (i) the Indenture International Interest assigned International Registry File No.
            ; and (ii) the Sale assigned International Registry File No.         ; 

 Page 3 
  

	 	(i)	the Indenture International Interest is a duly registered first priority International Interest as defined in the Cape Town Treaty in favor of the Mortgagee in the Aircraft and the Engines, subject to the terms of the
Cape Town Treaty; 

  

	 	(j)	the Trust Indenture, as amended by the Indenture Amendment, constitutes a valid, duly perfected mortgage and security interest in favor of the Mortgagee in the Aircraft and the Engines pursuant to and in accordance with
the Transportation Code, subject to the terms of the Cape Town Treaty; 

  

	 	(k)	no further registration with the International Registry of the Indenture International Interest is required under the Cape Town Treaty and no filings or recordings of the Trust Indenture or the Indenture Amendment
(other than the filings and recordings with the FAA which have been effected) are necessary to perfect and maintain the effectiveness and priority of the interests created thereunder; and 

 

	 	(l)	no authorization, approval, consent, license or order of, or registration with, or giving of notice to, the FAA Aircraft Registry or the International Registry is required for the valid authorization, delivery or
performance of the Trust Indenture or the Indenture Amendment, or to maintain the effectiveness and priority thereof, except for such authorizations, approvals, consents, licenses, orders, registrations and notices as have been effected.

 No opinion is herein expressed as to: (i) laws other than the federal laws of the United States; (ii) the
validity or enforceability under local law of the Trust Indenture, as amended by the Indenture Amendment; and (iii) the recognition of the perfection of the security interest created by the Trust Indenture, as amended by the Indenture
Amendment, as against third parties in any legal proceedings outside the United States. Since our examination was limited to records maintained by the FAA Aircraft Registry and the International Registry, our opinion does not cover liens which are
perfected without the filing of notice thereof with the FAA and without the registration of notice thereof with the International Registry, such as federal tax liens, liens arising under Section 1368(a) of Title 29 of the United States Code and
possessory artisans liens, and is subject to: (i) the accuracy of FAA personnel in the filing, indexing, posting, recording and additions to the Registry Modernization System of instruments filed with the FAA and in the search for encumbrance
cross-reference index records for the Engines; (ii) the accuracy of the information contained in the Priority Search Certificates; and (iii) the inclusion of all registered interests associated with the Aircraft and the Engines in the
Priority Search Certificates. We have assumed that the instruments in the records maintained by the FAA for the Aircraft and the Engines and the instruments supporting the registrations on the International Registry are sufficient under the relevant
local law to create or terminate the interests they purport to create or terminate. 
  

	
	Very truly yours,
	
	Jason Hasty

 EXHIBIT A 

MORTGAGEE AND SUBORDINATION AGENT 

Wilmington Trust, National Association 

OWNER 
 United Airlines,
Inc. 
 PASS THROUGH TRUSTEE 

Wilmington Trust, National Association 

LIQUIDITY PROVIDER 

National Australia Bank Limited, New York Branch 

Credit Suisse Securities (USA) LLC 

LEAD BOOKRUNNER 
 Credit
Suisse Securities (USA) LLC 
 RATING AGENCIES 

Moody’s Investors Service, Inc. 

Fitch Ratings, Inc. 

 EXHIBIT H TO NOTE PURCHASE AGREEMENT 

Amendment No. 1 
 to

 Participation Agreement [    ] 

Amendment No. 1, dated as of May 23, 2018, between United Airlines, Inc. (“Owner”) and Wilmington Trust, National
Association (“WTNA”), not in its individual capacity, except as expressly provided therein, but solely as Mortgagee (“Mortgagee”), Subordination Agent under the Intercreditor Agreement (“Subordination
Agent”), and Pass Through Trustee under the Class AA Pass Through Trust, the Class A Pass Through Trust and the Class B Pass Through Trust, to Participation Agreement
[                    ], dated as of
[                    ] (the “Participation Agreement”), between Owner and WTNA, as Mortgagee, Subordination Agent and Pass
Through Trustee under the Class AA Trust and Class A Trust. 
 W I T N E S S
E T H : 
 WHEREAS, Owner, Mortgagee, Subordination Agreement and Pass Through Trustee under the Class AA Trust
and Class A Trust entered into the Participation Agreement; and 
 WHEREAS, Owner has elected to issue the Series B Equipment Notes as
permitted by the related Trust Indenture, dated as of the date of the Participation Agreement (the “Trust Indenture”), and in connection with such issuance, Owner has requested certain amendments to the Participation Agreement and
the Trust Indenture. 
 NOW, THEREFORE, in consideration of the premises and for good and valuable consideration, the receipt and
sufficiency of which are hereby acknowledged, the parties hereto agree as follows: 
  

 Page 2 
  

 Section 1. Definitions. Unless otherwise defined or
provided herein, terms used herein that are defined in the Trust Indenture, as amended as of the date of this Amendment, have such respective defined meanings. 

Section 2. Amendments. 

Section 2.1 Agreements 

(a) For the avoidance of doubt, the amendments to defined terms in the Trust Indenture made as of the date of this Amendment are effective for
purposes of the Participation Agreement to the extent used therein. 
 (b) The last paragraph of Section 2.1 is amended to insert
(i) in the first sentence after “Series A Equipment Notes” the following: “or Series B Equipment Notes” and (ii) in the second sentence after “Series A” the following: “, Series B”. 

Section 2.2 Schedule 1 

Schedule 1 is amended by inserting after the last row thereof the following: 

 

					
	Wilmington Trust, National Association, as Pass Through Trustee for the 2018-1B Pass Through Trust	  	 Wilmington Trust, National Association

Wilmington, Delaware 19890-1605
 Account No.: 126829-000
 ABA#: 031-100092

Attention: Corporate Trust Administration
 Reference: United
[        ]
	  	 Wilmington Trust, National Association
 1100
North Market Street
 Wilmington, Delaware 19890-1605

Attention: Corporate Trust Administration
 Facsimile: (302) 636-4140

 Section 2.3 Schedule 2 

Schedule 2 is amended by inserting after the last row thereof the following: 

 

					
	2018-1B	  	 Series B
	  	[        ]

 Section 3. Additional Party. By signing below, the Class B Pass
Through Trustee shall be deemed a party to the Participation Agreement. 

 Page 3 
  

 Section 4. Construction. Effective as of the date
hereof, all references in the Participation Agreement to the “Participation Agreement” shall be deemed to refer to the Participation Agreement as amended by this Amendment, and the parties hereto confirm their respective obligations
thereunder. Except as otherwise specified in this Amendment, the Participation Agreement shall remain in all respects unchanged and in full force and effect. 

Section 5. Governing Law. This Amendment shall be governed by, and construed in accordance with, the law
of the State of New York. 
 Section 6. Counterparts. This Amendment may be executed by the
parties hereto in separate counterparts, each of which when so executed and delivered shall be an original, but all such counterparts shall together constitute but one and the same instrument. 

 Page 4 
  

 IN WITNESS WHEREOF, the parties hereto have caused this Amendment to be duly executed by
their respective officers thereunto duly authorized, as of the date and year first above written. 
  

					
	UNITED AIRLINES, INC.,
		 	Owner	 	
		
	By	 	  

		 	Name:	 	
		 	Title:	 	
	
	WILMINGTON TRUST, NATIONAL
		 	 ASSOCIATION,
 not in its individual
capacity, except as expressly provided herein, but solely as Mortgagee

		
	By	 	  

		 	Name:	 	
		 	Title:	 	
	
	WILMINGTON TRUST, NATIONAL
		 	 ASSOCIATION
 not in its individual
capacity, except as expressly provided herein, but solely as Pass Through Trustee under the Pass Through Trust Agreement for the United Airlines Pass Through Trust,
2018-1AA-O

		
	By	 	  

		 	Name:	 	
		 	Title:	 	

 Page 5 
  

 
			
	WILMINGTON TRUST, NATIONAL
		 	 ASSOCIATION
 not in its individual capacity,
except as expressly provided herein, but solely as Pass Through Trustee under the Pass Through Trust Agreement for the United Airlines Pass Through Trust,
2018-1A-O

		
	By	 	  

		 	Name:
		 	Title:
	
	WILMINGTON TRUST, NATIONAL
		 	 ASSOCIATION,
 not in its individual capacity,
except as expressly provided herein, but solely as Pass Through Trustee under the Pass Through Trust Agreement for the United Airlines Pass Through Trust,
2018-1B-O

		
	By	 	  

		 	Name:
		 	Title
	
	WILMINGTON TRUST, NATIONAL
		 	 ASSOCIATION,
 not in its individual capacity,
except as expressly provided herein, but solely as Subordination Agent

		
	By	 	  

		 	Name:
		 	Title:

 EXHIBIT I TO NOTE PURCHASE AGREEMENT 

Amendment No. 1 
 to

 Trust Indenture and Mortgage [        ] 

Amendment No. 1, dated as of May 23, 2018 (this “Amendment”), to Trust Indenture and Mortgage
[        ], dated as of [                ] (the “Trust Indenture”), between United Airlines, Inc.
(“Owner”) and Wilmington Trust, National Association, not in its individual capacity, except as expressly stated therein, but solely as Mortgagee (“Mortgagee”). 

W I T N E S S E T H : 

WHEREAS, Owner and Mortgagee entered into the Trust Indenture and Trust Indenture and Mortgage
[        ] Supplement No. 1, dated [                    ], which were recorded as one
instrument by the FAA on [                    ] and were assigned Conveyance No. [        ]
relating to one Boeing model [        ] aircraft with manufacturer’s serial number [        ] and United States nationality and registration marks N
[        ] and the two [        ] model aircraft engines with manufacturer’s serial numbers [        ]
and [        ]; 
 WHEREAS, Owner has elected to issue the Series B Equipment Notes as
permitted by the Trust Indenture, and in connection with such issuance, Owner has requested certain amendments to the Trust Indenture pursuant to Section 10.01(b)(vii) of the Trust Indenture; and 

WHEREAS, all things have been done to make the Series B Equipment Notes, when executed by the Owner and authenticated and delivered by the
Mortgagee under the Trust Indenture, the valid, binding and enforceable obligations of the Owner. 
 NOW, THEREFORE, in consideration of the
premises and for good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, the parties hereto agree as follows: 

 Section 1. Definitions. Unless otherwise defined or provided
herein, terms used herein that are defined in the Trust Indenture, as amended by this Amendment, have such respective defined meanings. 

Section 2. Amendments. 

Section 2.1 Granting Clause 

(a) The paragraph number (4) of the granting clause is amended by deleting the reference to “(iv)” and inserting in lieu thereof
the following reference: “(v)”. 
 Section 2.2 Form of Equipment Notes. 

(a) The form of Equipment Note included in Section 2.01 is amended by deleting the text of footnote 4 and substituting in lieu
thereof the following: “To be inserted in the case of a Series B Equipment Note.”. 
 (b) The form of Equipment Note included
in Section 2.01 is amended by inserting in paragraph 12 of such form after “[Series AA Equipment Notes, Series A Equipment Notes, Related Series AA Equipment Notes and Related Series A Equipment Notes]4” the following text: “[Series AA Equipment Notes, Series A Equipment Notes, Series B Equipment Notes, Related Series AA Equipment Notes, Related Series A Equipment Notes and Related Series
B Equipment Notes]4A”, and inserting at the bottom of the page on which such text appears the following footnote 4A: “To be inserted in the case of an Additional Series Equipment
Note.”. 
 Section 2.3 Issuance and Terms of Equipment Notes. 

(a) Section 2.02 is amended by amending and restating the first two sentences of the first paragraph to read as follows: 

“The Equipment Notes (other than the Additional Series Equipment Notes) shall be issued in three separate series, consisting of Series AA
and Series A, dated as of the Closing Date, and Series B to be dated the Class B Issuance Date, and shall be in the maturities and principal amounts and 

  
 2 

 
bear interest as specified in Schedule I hereto. On the Closing Date, the Series AA Equipment Notes and the Series A Equipment Notes were issued to the Subordination Agent on behalf of the
Applicable Pass Through Trustee under the Applicable Pass Through Trust Agreement, and on the Class B Issuance Date, the Series B Equipment Notes shall be issued to the Subordination Agent on behalf of the Class B Pass Through Trustee
under the Class B Pass Through Trust Agreement.”. 
 (b) Section 2.02 is amended by deleting in the fourth sentence of the
first paragraph “‘Series B’” and “‘Series C”” and inserting in lieu thereof the following: “‘Series C’ and ‘Series D’”. 

(c) Section 2.02 is amended by inserting in the last sentence of the first paragraph after “new Series A Equipment Notes” the
following: “or new Series B Equipment Notes”. 
 (d) Section 2.02 is amended by inserting at the end of the first paragraph before
the period “or Section 2.11(c)”. 
 (d) Section 2.02 is amended by deleting in the third paragraph thereof, in
clauses (a)(i) and (a)(v), “Series AA Equipment Notes and Series A Equipment Notes” and inserting in lieu thereof the following: “Series AA Equipment Notes, Series A Equipment Notes and Series B Equipment Notes”.

 (e) Section 2.02 is amended by deleting in the third paragraph thereof, in clauses (a)(i) and (a)(v), “‘Series AA
Equipment Notes’ and ‘Series A Equipment Notes’ (each as defined in the Note Purchase Agreement)” and inserting in lieu thereof the following: “‘Series AA Equipment Notes’, ‘Series A Equipment
Notes’ and ‘Series B Equipment Notes’ (each as defined in the Note Purchase Agreement)”. 

  
 3 

 (f) Section 2.02 is amended by deleting in the third paragraph thereof, in
clause (a)(v), “‘Series AA Equipment Notes’ or ‘Series A Equipment Notes’ (as defined in the Note Purchase Agreement)” and inserting in lieu thereof the following: “‘Series AA Equipment
Notes’, ‘Series A Equipment Notes’ or ‘Series B Equipment Notes’ (each as defined in the Note Purchase Agreement)”. 

Section 2.4 Voluntary Redemptions of Equipment Notes 

(a) Section 2.11(a) is amended by amending and restating the proviso therein in its entirety as follows: 

“provided that no redemption shall be permitted under this Section 2.11(a) unless simultaneously with such redemption all
Related Series AA Equipment Notes, Related Series A Equipment Notes, and Related Series B Equipment Notes shall also be redeemed.”. 

(b) Section 2.11 is amended by inserting a new paragraph (c) at the end of such Section as follows: 

“(c) All (but not less than all) of the Series B Equipment Notes may be redeemed by the Owner upon at least 30 days’ revocable
prior written notice to the Mortgagee and the Note Holders of such Series, and such Equipment Notes shall be redeemed in whole at a redemption price equal to 100% of the unpaid Original Amount thereof, together with accrued interest thereon to the
date of redemption and all other Secured Obligations (other than Related Secured Obligations) owed or then due and payable to the Note Holders of such Series plus Make-Whole Amount, if any; provided that no redemption shall be permitted under
this Section 2.11(c) unless the following conditions have been satisfied: (1) simultaneously with such redemption, the Related Series B Equipment Notes shall also be redeemed; and (2) simultaneously with such redemption, new
Series B Equipment Notes shall be reissued in accordance with Section 4(a)(vi) of the Note Purchase Agreement and Section 9.1(c) of the Intercreditor Agreement.”. 

 

  
 4 

 Section 2.5 Subordination. 

Section 2.13(c) is amended by (a) deleting “and” at the end of subclause (ii) and inserting in lieu thereof a comma,
and (b) deleting subclause (iii) and substituting in lieu thereof the following replacement subclause (iii) and new subclause (iv): “(iii) after the Secured Obligations in respect of Series A Equipment Notes and Related Series A
Equipment Notes have been paid in full, the Note Holders of Series B Equipment Notes and Related Note Holders of the Related Series B Equipment Notes until the Secured Obligations in respect of the Series B Equipment Notes and the Related Series B
Equipment Notes have been paid in full, and (iv) after the Secured Obligations of the Series B Equipment Notes and Related Series B Equipment Notes have been paid in full, (and except as otherwise provided in an amendment to this Trust
Indenture pursuant to Section 10.01(b) hereof), the Note Holders of the Additional Series Equipment Notes, if issued, and Related Note Holders of the Related Additional Series Equipment Notes, if issued, until the Secured Obligations in respect
of the Additional Series Equipment Notes and Related Additional Series Equipment Notes have been paid in full.”. 

Section 2.6 Receipt, Distribution and Application of Payments. 

(a) Section 3.01 is amended by (i) deleting “and” at the end of paragraph (ii) of such Section, (ii) renumbering
paragraph (iii) as paragraph (iv), and deleting in such renumbered paragraph the reference to “paragraph (ii) above” and substituting in lieu thereof “paragraph (iii) above”, and (iii) inserting a new
paragraph (iii) after paragraph (ii) of such Section to read as follows: 
 “(iii) after giving effect to paragraph
(ii) above, so much of such payment remaining as shall be required to pay in full the aggregate amount of the payment or payments of Original Amount and interest (as well as any interest on any overdue Original Amount and, to the extent
permitted by Law, on any overdue interest) then due under all Series B Equipment Notes shall be distributed to the Note Holders of Series B ratably, without priority of one over the other, in the proportion that the amount of such payment or
payments then due under each Series B Equipment Note bears to the aggregate amount of the payments then due under all Series B Equipment Notes; and”. 

  
 5 

 (b) Section 3.02 is amended, in clause “Second” of such Section, by
(i) renumbering paragraph (iii) as paragraph (iv), and (ii) inserting a new paragraph (iii) after paragraph (ii) of such clause “Second” to read as follows: 

“(iii) after giving effect to paragraph (ii) above, to pay the amounts specified in paragraph (iii) of clause “Third”
of Section 3.03 hereof plus Make-Whole Amount, if any, then due and payable in respect of the Series B Equipment Notes, but excluding distributions of amounts of Related Secured Obligations to Related Note Holders; and”. 

(c) Section 3.02 is amended, in clause “Third” of such Section, by (i) renumbering paragraph (iii) as paragraph (iv), and
(ii) inserting a new paragraph (iii) after paragraph (ii) of such clause “Third” to read as follows: 
 “(iii)
after giving effect to paragraph (ii) above, to pay the amounts specified in paragraph (iii) of clause “Third” of Section 3.03 hereof then due and payable in respect of the Related Series B Equipment Notes; and”. 

(d) Section 3.02 is amended , in each of renumbered paragraph (iv) of clause “Second” and renumbered paragraph (iv) of
clause “Third” of such Section, by (i) deleting the reference therein to “paragraph (ii) above” and substituting in lieu thereof “paragraph (iii) above”, and (ii) deleting the reference therein to
“paragraph (iii) of clause ‘Third’” and substituting in lieu thereof “paragraph (iv) of clause ‘Third’”. 

(e) Section 3.02 is amended by inserting in the second proviso following clause “Fourth” after
“Section 2.11(b)” the following: “or Section 2.11(c)”. 
 (f) Section 3.03 is amended, in clause
“Third” of such Section, by (i) renumbering paragraph (iii) as paragraph (iv), and deleting in such renumbered paragraph the reference to “paragraph (ii) above” and substituting in lieu thereof “paragraph
(iii) above”, (ii) renumbering paragraph (iv) as paragraph (v), and deleting in such renumbered paragraph the reference to “paragraph (iii) above” and substituting in lieu thereof “paragraph (iv) above”,
and (iii) inserting a new paragraph (iii) after paragraph (ii) of such clause “Third” to read as follows: 

  
 6 

 “(iii) after giving effect to paragraph (ii) above, so much of such payments or amounts
remaining as shall be required to pay in full the aggregate unpaid Original Amount of all Series B Equipment Notes, and the accrued but unpaid interest and other amounts due thereon and all other Secured Obligations in respect of the Series B
Equipment Notes to the date of distribution and all other Related Secured Obligations in respect of Related Series B Equipment Notes then due, shall be distributed to the Note Holders of Series B and Related Note Holders of the Related Series B
Equipment Notes, and in case the aggregate amount so to be distributed shall be insufficient to pay in full as aforesaid, then ratably, without priority of one over the other, to each Note Holder and Related Note Holder in the proportion that the
aggregate unpaid Original Amount of all Series B Equipment Notes held by such holder plus the accrued but unpaid interest and other amounts due hereunder or thereunder to the date of distribution and all other Related Secured Obligations then due in
respect of the Related Series B Equipment Notes held by such holder, bears to the aggregate unpaid Original Amount of all Series B Equipment Notes plus the accrued but unpaid interest and other amounts due thereon to the date of distribution and all
other Related Secured Obligations in respect of the Related Series B Equipment Notes then due;”. 
 (g) Section 3.07 is amended by
deleting in the third sentence the reference to “(iv) of Clause “Third”” and inserting in lieu thereof the following: “(v) of Clause “Third””. 

  
 7 

 Section 2.7 Supplements and Amendments 

Section 10.01(b) is amended by inserting in clause (vii) after “(and Related Series A Equipment Notes)” the following:
“or Series B Equipment Notes (and Related Series B Equipment Notes)”. 
 Section 2.8 Miscellaneous 

Section 11.01 is amended by deleting the reference to “(iv)” and inserting in lieu thereof the following reference:
“(v)”. 
 Section 2.9 Definitions 

(a) The definition of “Additional Series” (or “Additional Series Equipment Notes”) is amended by deleting the first
parenthetical and substituting in lieu thereof the following: “(other than “Series AA”, “Series A” or “Series B”)”. 

(b) The definition of “Deposit Agreement” is amended and restated to read as follows: 

“Deposit Agreement” means each of the three Deposit Agreements between the Escrow Agent and the Depositary, dated as of the
Issuance Date (or, in the case of the Deposit Agreement relating to the Class B Pass Through Trust, dated as of the Class B Issuance Date), which relate to the Class AA, Class A or Class B Pass Through Trust, provided
that, for purposes of any obligation of Owner, no amendment, modification or supplement to, or substitution or replacement of, any such Deposit Agreement shall be effective unless consented to by Owner. 

(c) The definition of “Escrow Agreement” is amended and restated to read as follows: 

“Escrow Agreement” means each of the three Escrow and Paying Agent Agreements, among the Escrow Agent, the Paying Agent,
certain initial purchasers of the Pass Through Certificates named therein and one of the Pass Through Trustees, dated as of the Issuance Date (or, in the case of the Escrow Agreement relating to the Class B Pass Through Trust, dated as of the
Class B Issuance Date), which relate to the Class AA, Class A or Class B Pass Through Trust, provided that, for purposes of any obligation of Owner, no amendment, modification or supplement to, or substitution or
replacement of, any such Escrow Agreement shall be effective unless consented to by Owner. 

  
 8 

 (d) The definition of “Intercreditor Agreement” is amended and restated to read as
follows: 
 “Intercreditor Agreement” means that certain Amended and Restated Intercreditor Agreement among the Pass Through
Trustees, the Liquidity Providers and the Subordination Agent, dated as of the Class B Issuance Date, provided that for purposes of any obligation of Owner, no amendment, modification or supplement to, or substitution or
replacement of, such Intercreditor Agreement shall be effective unless consented to by Owner. 
 (e) The definition of “Liquidity
Facilities” is amended and restated to read as follows: 
 “Liquidity Facilities” means the three Revolving Credit
Agreements (consisting of one Revolving Credit Agreement with the Liquidity Provider with respect to the Class AA Pass Through Trust, a second Revolving Credit Agreement with the Liquidity Provider with respect to the Class A Pass Through
Trust, each of which is dated as of the Issuance Date, and a third Revolving Credit Agreement with the Liquidity Provider with respect to the Class B Pass Through Trust, dated as of the Class B Issuance Date) between the Subordination
Agent, as borrower, and the Liquidity Provider, provided that, for purposes of any obligation of Owner, no amendment, modification or supplement to, or substitution or replacement of, any such Liquidity Facility shall be effective
unless consented to by Owner. 
 (f) The definition of “Liquidity Provider” is amended (i) by deleting “and” before
“Class A Liquidity Provider” and inserting in lieu thereof a comma and (ii) inserting after “Class A Liquidity Provider” the following: “and ‘Class B Liquidity Provider’”. 

(g) The definition of “Make-Whole Spread” is amended and restated to read as follows: 

  
 9 

 Make-Whole Spread” means (i) in the case of Series AA Equipment Notes, .125%,
(ii) in the case of Series A Equipment Notes, .150%, (iii) in the case of Series B Equipment Notes, .30% and (iv) in the case of any Additional Series, the percentage specified in Schedule I hereto (as amended at the time of original issuance
of such Additional Series) as the “Make-Whole Spread” for such Additional Series. 
 (h) The definition of “Note Purchase
Agreement” is amended and restated to read as follows: 
 “Note Purchase Agreement” means the Note Purchase Agreement,
dated as of the Issuance Date, among United Airlines, Inc., the Subordination Agent, the Escrow Agent, the Paying Agent and the Pass Through Trustee under each Pass Through Trust Agreement (other than the Escrow Agent, the Paying Agent and the Pass
Through Trustee with respect to the Class B Pass Through Trust), as amended by the NPA Amendment, providing for, among other things, the issuance and sale of certain equipment notes. 

(i) The definition of “Participation Agreement” is amended by inserting “as amended by the PA Amendment” following
“Mortgagee”. 
 (j) The definition of “Pass Through Trust” is amended by deleting “two” and inserting in lieu
thereof “three”. 
 (k) The definition of “Pass Through Trust Agreement” is amended and restated as follows: 

“Pass Through Trust Agreement” means each of the three separate Trust Supplements, together in each case with the Basic Pass
Through Trust Agreement, each dated as of the Issuance Date (or, in the case of the Pass Through Trust Agreement relating to the Class B Pass Through Trust, dated as of the Class B Issuance Date) by and between the Owner and a Pass Through
Trustee, provided that, for purposes of any obligation of Owner, no amendment, modification or supplement to, or substitution or replacement of, any such Agreement shall be effective unless consented to by Owner. 

  
 10 

 (l) The definition of “Series” is amended by inserting “, Series B” following
“Series A”. 
 (m) The definition “Trust Indenture” is amended by inserting “as amended by the Indenture
Amendment” following “Mortgagee”. 
 (n) The following new definitions shall be inserted in Annex A in appropriate
alphabetical order: 
 “Class B Issuance Date” means May 23, 2018. 

“Class B Pass Through Trust” means the United Airlines Pass Through Trust
2018-1B. 
 “Class B Pass Through Trust Agreement” means the
Trust Supplement No. 2018-1B, dated as of the Class B Issuance Date, together with the Basic Pass Through Trust Agreement, between Owner and the Class B Pass Through Trustee; provided that for
purposes of any obligation of Owner, no amendment, modification or supplement to, or substitution or replacement of, such Agreement shall be effective unless consented to by Owner. 

“Class B Pass Through Trustee” means Wilmington Trust, National Association, a national banking
association, in its capacity as trustee under the Class B Pass Through Trust Agreement. 
 “Indenture Amendment” means
Amendment No. 1 to the Trust Indenture entered into pursuant to the NPA Amendment. 
 “NPA Amendment” means the
Amendment No. 1 to Note Purchase Agreement, dated as of the Class B Issuance Date, among the Owner, the Pass Through Trustees, the Subordination Agent and the “Mortgagee” under each Operative Indenture; provided that for purposes
of any obligation of Owner, no amendment, modification or supplement to, or substitution or replacement of, such Agreement shall be effective unless consented to by Owner. 

  
 11 

 “PA Amendment” means Amendment No. 1 to the Participation Agreement entered
into pursuant to the NPA Amendment. 
 “Related Series B Equipment Note” means, as of any date, a “Series B
Equipment Note”, as defined in each Related Indenture, but only if as of such date it is held by the “Subordination Agent” under the “Intercreditor Agreement”, as such terms are defined in such Related Indenture. 

“Series B” or “Series B Equipment Notes” means Equipment Notes issued under the Trust Indenture and
designated as “Series B” thereunder, in the Original Amount and maturities and bearing interest as specified in Schedule I to the Trust Indenture under the heading “Series B”. 

Section 2.10 Schedule I. 

Schedule I to the Trust Indenture is amended by inserting at the end thereof the information set forth on Schedule I to this Amendment. 

Section 3. Construction. Effective as of the date hereof, all references in the Trust Indenture to the
“Trust Indenture” shall be deemed to refer to the Trust Indenture as amended by this Amendment, and the parties hereto confirm their respective obligations thereunder. Except as otherwise specified in this Amendment, the Trust Indenture
shall remain in all respects unchanged and in full force and effect. 
 Section 4. Governing Law. This
Amendment shall be governed by, and construed in accordance with, the law of the State of New York. 
 Section 5.
Counterparts. This Amendment may be executed by the parties hereto in separate counterparts, each of which when so executed and delivered shall be an original, but all such counterparts shall together constitute but one and the same
instrument. 
 [Remainder of this page is blank.] 

  
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 IN WITNESS WHEREOF, the parties hereto have caused this Amendment to be duly executed by their
respective officers thereunto duly authorized, as of the date and year first above written. 
  

			
	UNITED AIRLINES, INC.
		
	By	 	  

		 	Name:
		 	Title:
	
	WILMINGTON TRUST, NATIONAL ASSOCIATION,
		 	not in its individual capacity, but solely as
		 	Mortgagee
		
	By	 	  

		 	Name:
		 	Title:

  
 13 

 SCHEDULE I 

TO 
 AMENDMENT NO. 1

 TO TRUST INDENTURE AND MORTGAGE [____] 

SERIES B 
 Original Amount:
[        ] 
 Interest Rate: 4.60% 

Make Whole Spread: 0.30% 
 Maturity Date: March 1, 2026

 Series B Equipment Note Amortization: [To insert based on Schedule IV to the Note Purchase Agreement] 

 

			
	 Payment Date
	  	 Percentage of Original
Amount to be Paid

  
 14

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