Document:

EX-4.2

 Exhibit 4.2 

EXECUTION VERSION 
 TRUST
SUPPLEMENT No. 2018-1B-S 
 Dated as of May 23, 2018

 between 
 WILMINGTON TRUST,
NATIONAL ASSOCIATION 
 as Trustee, 

and 
 UNITED AIRLINES, INC. 

to 
 PASS THROUGH TRUST AGREEMENT

 Dated as of October 3, 2012 

$225,729,000 
 United Airlines
Pass Through Trust 2018-1B-S 
 4.600% United Airlines Pass
Through Certificates, Series 2018-1B-S 

 TABLE OF CONTENTS 
  

					
	 	  	Page	 
		
	 ARTICLE I THE CERTIFICATES
	  	 	2	 
	 Section 1.01. The Certificates
	  	 	2	 
		
	 ARTICLE II DEFINITIONS
	  	 	5	 
	 Section 2.01. Definitions
	  	 	5	 
		
	 ARTICLE III DISTRIBUTIONS; STATEMENTS TO CERTIFICATEHOLDERS
	  	 	12	 
	 Section 3.01. Statements to Applicable Certificateholders
	  	 	12	 
	 Section 3.02. Special Payments Account
	  	 	14	 
	 Section 3.03. Distributions from Special Payments Account
	  	 	14	 
	 Section 3.04. Limitation of Liability for Payments
	  	 	15	 
		
	 ARTICLE IV DEFAULT
	  	 	15	 
	 Section 4.01. Purchase Rights of Certificateholders
	  	 	15	 
	 Section 4.02. Amendment of Section 6.05 of the Basic Agreement
	  	 	18	 
		
	 ARTICLE V THE TRUSTEE
	  	 	18	 
	 Section 5.01. Acquisition of Trust Property
	  	 	18	 
	 Section 5.02. [Intentionally Omitted]
	  	 	19	 
	 Section 5.03. The Trustee
	  	 	19	 
	 Section 5.04. Representations and Warranties of the Trustee
	  	 	19	 
	 Section 5.05. Trustee Liens
	  	 	20	 
		
	 ARTICLE VI ADDITIONAL AMENDMENT; SUPPLEMENTAL AGREEMENTS
	  	 	20	 
	 Section 6.01. Amendment of Section 5.02 of the Basic Agreement
	  	 	20	 
	 Section 6.02. Supplemental Agreements without Consent of Applicable
Certificateholders
	  	 	21	 
	 Section 6.03. Supplemental Agreements with Consent of Applicable Certificateholders
	  	 	21	 
	 Section 6.04. Consent of Holders of Certificates Issued under Other Trusts
	  	 	21	 
		
	 ARTICLE VII TERMINATION OF TRUST
	  	 	22	 
	 Section 7.01. Termination of the Applicable Trust
	  	 	22	 
		
	 ARTICLE VIII MISCELLANEOUS PROVISIONS
	  	 	23	 
	 Section 8.01. Basic Agreement Ratified
	  	 	23	 
	 Section 8.02. GOVERNING LAW
	  	 	23	 
	 Section 8.03. Execution in Counterparts
	  	 	23	 
	 Section 8.04. Intention of Parties
	  	 	23	 

 This Trust Supplement No.
2018-1B-S, dated as of May 23, 2018 (herein called the “Trust Supplement”), between United Airlines, Inc., a Delaware corporation (the
“Company”), and Wilmington Trust, National Association (the “Trustee”), to the Pass Through Trust Agreement, dated as of October 3, 2012, between the Company (formerly known as Continental Airlines, Inc.) and
the Trustee (the “Basic Agreement”). 
 W I T N E S S E T
H: 
 WHEREAS, the Basic Agreement, unlimited as to the aggregate face amount of Certificates (unless otherwise specified herein,
capitalized terms used herein without definition having the respective meanings specified in the Basic Agreement) which may be issued thereunder, has heretofore been executed and delivered; 

WHEREAS, the Company is the owner of or has obtained commitments from Boeing for the delivery of two Boeing
737-800 aircraft, six Boeing 737 MAX 9 aircraft, five Boeing 787-9 aircraft and three Boeing 777-300ER aircraft (collectively,
the “Applicable Aircraft”); 
 WHEREAS, as of the Transfer Date, the Company will have financed the Applicable Aircraft and
will have issued Series AA Equipment Notes and Series A Equipment Notes (each as defined in the NPA) to finance a portion of the purchase price of such Applicable Aircraft pursuant to the NPA (as defined below); 

WHEREAS, as of the Transfer Date, with respect to each Applicable Aircraft, the Company will have issued pursuant to an Indenture, on a
recourse basis, Series B Equipment Notes to finance a portion of the purchase price of such Applicable Aircraft pursuant to the NPA (as defined below); 

WHEREAS, as of the Transfer Date, the Related Trustee will assign, transfer and deliver all of such trustee’s right, title and interest
to the trust property held by the Related Trustee to the Trustee pursuant to the Assignment and Assumption Agreement; 
 WHEREAS, the
Trustee, effective only, but automatically, upon execution and delivery of the Assignment and Assumption Agreement, will be deemed to have declared the creation of the United Airlines Pass Through Trust 2018-1B-S (the “Applicable Trust”) for the benefit of the Applicable Certificateholders, and each Holder of Applicable Certificates “Outstanding” as of the Transfer Date, as the
grantors of the Applicable Trust, by their respective acceptances of such Applicable Certificates (as defined below), will join in the creation of the Applicable Trust with the Trustee; 

WHEREAS, all Applicable Certificates to be deemed issued by the Applicable Trust will evidence Fractional Undivided Interests in the
Applicable Trust and will convey no rights, benefits or interests in respect of any property other than the Trust Property except for those Applicable Certificates to which an Escrow Receipt (as defined below) has been affixed; 

 WHEREAS, upon the execution and delivery of the Assignment and Assumption Agreement, all of the
conditions and requirements necessary to make this Trust Supplement, when duly executed and delivered, a valid, binding and legal instrument in accordance with its terms and for the purposes herein expressed, have been done, performed and fulfilled,
and the execution and delivery of this Trust Supplement in the form and with the terms hereof have been in all respects duly authorized; and 

WHEREAS, this Trust Supplement is subject to the provisions of the Trust Indenture Act of 1939, as amended, and shall, to the extent
applicable, be governed by such provisions. 
 NOW THEREFORE, in consideration of the premises herein, it is agreed between the Company and
the Trustee as follows: 
 ARTICLE I 

THE CERTIFICATES 

Section 1.01. The Certificates. The Applicable Certificates shall be known as “United Airlines Pass Through Certificates,
Series 2018-1B-S”. Each Applicable Certificate represents a Fractional Undivided Interest in the Applicable Trust created hereby. The Applicable Certificates shall
be the only instruments evidencing a Fractional Undivided Interest in the Applicable Trust. 
 The terms and conditions applicable to the
Applicable Certificates are as follows: 
 (a) The aggregate face amount of the Applicable Certificates that shall be
initially deemed issued under the Agreement shall be equal to the aggregate principal amount of “Outstanding” pass through certificates representing Fractional Undivided Interests in the Related Trust on the Transfer Date. Subject to the
preceding sentence and Section 5.01 of this Trust Supplement and except for Applicable Certificates authenticated and delivered under Sections 3.03, 3.04, 3.05 and 3.06 of the Basic Agreement, no Applicable Certificates shall be
authenticated under the Agreement. 
 (b) The Regular Distribution Dates with respect to any distribution of Scheduled
Payments means March 1 and September 1 of each year, commencing on September 1, 2018 until distribution of all of the Scheduled Payments to be made under the Series B Equipment Notes has been made. 

(c) The Special Distribution Dates with respect to the Applicable Certificates means any Business Day on which a Special
Payment is to be distributed pursuant to the Agreement. 
 (d) At the Escrow Agent’s request under the Escrow Agreement,
the Trustee shall affix the corresponding Escrow Receipt to each Applicable Certificate. In any event, any transfer or exchange of any Applicable Certificate shall also effect a transfer or exchange of the related Escrow Receipt. Prior to the Final
Distribution, no transfer or 

  
 
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exchange of any Applicable Certificate shall be permitted unless the corresponding Escrow Receipt is attached thereto and also is so transferred or exchanged. By acceptance of any Applicable
Certificate to which an Escrow Receipt is attached, each Holder of such an Applicable Certificate acknowledges and accepts the restrictions on transfer of the Escrow Receipt set forth herein and in the Escrow Agreement. 

(e) (i) The Applicable Certificates shall be in the form attached hereto as Exhibit A to the Related Pass Through Trust
Supplement, with such appropriate insertions, omissions, substitutions and other variations as are required or permitted by the Related Pass Through Trust Agreement or the Agreement, as the case may be, or as the Trustee may deem appropriate, to
reflect the fact that the Applicable Certificates are being issued under the Agreement as opposed to under the Related Pass Through Trust Agreement. Any Person acquiring or accepting an Applicable Certificate or an interest therein will, by such
acquisition or acceptance, be deemed to have represented and warranted to and for the benefit of the Company that either (x) no assets of an employee benefit plan subject to Title I of the Employee Retirement Income Security Act of 1974, as
amended (“ERISA”), a plan subject to Section 4975 of the Internal Revenue Code of 1986, as amended (the “Code”), or a governmental, church or foreign plan subject to a law that is similar to Title I of ERISA or
Section 4975 of the Code (a “Similar Law Plan”) have been used to purchase or hold such Applicable Certificate or an interest therein or (y) the purchase and holding of such Applicable Certificate or an interest therein
either (A) in the case of assets of an employee benefit plan subject to Title I of ERISA or a plan subject to Section 4975 of the Code, are exempt from the prohibited transaction restrictions of ERISA and the Code pursuant to one or more
prohibited transaction statutory or administrative exemptions or (B) in the case of assets of a Similar Law Plan, will not violate any similar state, local or foreign law. 

(ii) The Applicable Certificates shall be Book-Entry Certificates and shall be subject to the conditions set forth in the
Letter of Representations between the Applicable Trust and the Clearing Agency attached as Exhibit B to the Related Pass Through Trust Supplement. 

(f) Any Person who is an employee benefit plan subject to Title I of ERISA, a plan subject to Section 4975 of the Code, or
an entity whose underlying assets are deemed to include “plan assets” by reason of such a plan’s investment in such entity (a “Benefit Plan Investor”) and is acquiring or accepting an Applicable Certificate or an
interest therein will, by such acquisition or acceptance, be deemed to have represented and warranted to and for the benefit of the Company, the Underwriters and their respective affiliates that (i) the decision to acquire or accept the
Applicable Certificate or interest therein has been made by a duly authorized fiduciary of the Benefit Plan Investor that (A) is independent (as that term is used in 29 C.F.R. 2510.3-21(c)(1)) of the
Company, each of the Underwriters, and their respective affiliates; (B) is a bank, an insurance carrier, a registered investment adviser, a registered broker-dealer, or an independent fiduciary that holds, or has under management or control,
total assets of at least $50 million (in each case, as specified in 29 C.F.R. 2510.3-21(c)(1)(i)(A)-(E)); (C) is capable of evaluating investment risks independently, both in general and with regard

  
 3 

 
to particular transactions and investment strategies (including, without limitation, with respect to the decision to acquire or accept the Applicable Certificate or interest therein); (D) has
been fairly informed that the Company, the Underwriters, and their respective affiliates have not and will not undertake to provide impartial investment advice, or to give advice in a fiduciary capacity, in connection with the acquisition or
acceptance of the Applicable Certificate or interest therein; (E) has been fairly informed of the existence and nature of the financial interests that the Company, the Underwriters, and their respective affiliates have in the Benefit Plan
Investor’s acquisition or acceptance of the Applicable Certificate or interest therein, which interests may conflict with the interest of the Benefit Plan Investor, as more fully described in the offering materials; and (F) is a fiduciary
under ERISA or the Code, or both, with respect to the decision to acquire or accept the Applicable Certificate or interest therein and is responsible for exercising (and has exercised) independent judgment in evaluating whether to invest the assets
of such Benefit Plan Investor in the Applicable Certificate or interest therein; and (ii) neither the Benefit Plan Investor nor such duly authorized fiduciary of the Benefit Plan Investor is paying the Company, any Underwriter, or any of their
respective affiliates, any fee or other compensation directly for the provision of investment advice (as opposed to other services) in connection with the Benefit Plan Investor’s acquisition or acceptance of the Applicable Certificate or
interest therein. 
 (g) The “Participation Agreements” as defined in this Trust Supplement are the “Note
Purchase Agreements” referred to in the Basic Agreement. 
 (h) The Applicable Certificates are subject to the
Intercreditor Agreement, the Deposit Agreement and the Escrow Agreement. 
 (i) The Applicable Certificates are entitled to
the benefits of the Liquidity Facility. 
 (j) The Responsible Party is the Company. 

(k) The date referred to in clause (i) of the definition of the term “PTC Event of Default” in the Basic
Agreement is the Final Maturity Date. 
 (l) The “particular sections of the Note Purchase Agreement”, for purposes
of clause (3) of Section 7.07 of the Basic Agreement, are Section 8.1 of each Participation Agreement. 
 (m)
The Series B Equipment Notes to be acquired and held in the Applicable Trust, and the related Aircraft and Note Documents, are described in the NPA. 

  
 4 

 ARTICLE II 

DEFINITIONS 
 Section 2.01.
Definitions. For all purposes of the Basic Agreement as supplemented by this Trust Supplement, the following capitalized terms have the following meanings (any term used herein which is defined in both this Trust Supplement and the Basic
Agreement shall have the meaning assigned thereto in this Trust Supplement for purposes of the Basic Agreement as supplemented by this Trust Supplement):  

Agreement: Means the Basic Agreement, as supplemented by this Trust Supplement. 

Aircraft: Means each of the Applicable Aircraft (or Substitute Aircraft) in respect of which a Participation Agreement
is to be or is entered into in accordance with the NPA (or any Substitute Aircraft, including engines therefor, owned by the Company and securing one or more Series B Equipment Notes). 

Aircraft Purchase Agreement: Has the meaning specified in the NPA. 

Applicable Aircraft: Has the meaning specified in the recitals hereto. 

Applicable Certificate: Means any of the “Applicable Certificates” issued by the Related Trust and that are
“Outstanding” (as defined in the Related Pass Through Trust Agreement) as of the Transfer Date (the “Transfer Date Certificates”) and any Certificate issued in exchange therefor or replacement thereof pursuant to the
Agreement. 
 Applicable Certificateholder: Means the Person in whose name an Applicable Certificate is registered on
the Register for the Applicable Certificates. 
 Applicable Trust: Has the meaning specified in the recitals hereto.

 Assignment and Assumption Agreement: Means the assignment and assumption agreement substantially in the form of
Exhibit C to the Related Pass Through Trust Supplement executed and delivered in accordance with Section 7.01 of the Related Pass Through Trust Supplement. 

Basic Agreement: Has the meaning specified in the first paragraph of this Trust Supplement. 

Boeing: Means The Boeing Company. 

Business Day: Means any day other than a Saturday, a Sunday or a day on which commercial banks are required or
authorized to close in New York, New York, Chicago, Illinois, or, so long as any Applicable Certificate is Outstanding, the city and state in which the Trustee, the Subordination Agent or any Loan Trustee maintains its Corporate Trust Office or
receives and disburses funds. 
 Certificate: Has the meaning specified in the Intercreditor Agreement. 

  
 5 

 Certificate Buyout Event: Means that a United Bankruptcy Event has
occurred and is continuing and either of the following events has occurred: (A) both (i) the 60-day period specified in Section 1110(a)(2)(A) of the U.S. Bankruptcy Code (the “60-Day Period”) has expired and (ii) the Company has not entered into one or more agreements under Section 1110(a)(2)(A) of the U.S. Bankruptcy Code to perform all of its obligations under all of
the Indentures or, if it has entered into such agreements, has at any time thereafter failed to cure any default under any of the Indentures in accordance with Section 1110(a)(2)(B) of the U.S. Bankruptcy Code; or (B) prior to the expiry
of the 60-Day Period, the Company shall have abandoned any Aircraft. 
 Class:
Has the meaning specified in the Intercreditor Agreement. 
 Class B Issuance Date: Has the meaning
specified in the NPA. 
 Closing Notice: Has the meaning specified in the Original NPA. 

Company: Has the meaning specified in the first paragraph of this Trust Supplement. 

Controlling Party: Has the meaning specified in the Intercreditor Agreement. 

Cut-off Date: Means the earlier of (a) the Delivery Period
Termination Date and (b) the date on which a Triggering Event occurs. 
 Delivery Period Termination Date: Has
the meaning specified in the Related Pass Through Trust Supplement. 
 Deposit Agreement: Means the Deposit Agreement
dated as of May 23, 2018 relating to the Applicable Certificates between the Depositary and the Escrow Agent, as the same may be amended, supplemented or otherwise modified from time to time in accordance with its terms. 

Depositary: Means Citibank, N.A. 

Deposits: Has the meaning specified in the Deposit Agreement. 

Distribution Date: Means any Regular Distribution Date or Special Distribution Date as the context requires. 

ERISA: Has the meaning specified in Section 1.01(e) of this Trust Supplement. 

Escrow Agent: Means, initially, U.S. Bank National Association and any replacement or successor therefor appointed in
accordance with the Escrow Agreement. 
 Escrow Agreement: Means the Escrow and Paying Agent Agreement dated as of
May 23, 2018 relating to the Applicable Certificates, among the Escrow Agent, the Escrow Paying Agent, the Related Trustee (and after the Transfer Date, the Trustee) and the Underwriters, as the same may be amended, supplemented or otherwise
modified from time to time in accordance with its terms. 

  
 6 

 Escrow Paying Agent: Means the Person acting as paying agent under the
Escrow Agreement. 
 Escrow Receipt: Means the receipt substantially in the form annexed to the Escrow Agreement
representing a Fractional Undivided Interest in the funds held in escrow thereunder. 
 Final Distribution: Has the
meaning specified in the Escrow Agreement. 
 Final Maturity Date: Means September 1, 2027. 

Final Withdrawal: Has the meaning specified in the Escrow Agreement. 

Final Withdrawal Date: Has the meaning specified in the Escrow Agreement. 

Financed Aircraft: Means each Applicable Aircraft (or Substitute Aircraft) in respect of which Series AA Equipment Notes
and Series A Equipment Notes have been issued on or prior to the Class B Issuance Date. 
 Indenture: Means each
of the separate trust indentures and mortgages relating to the Aircraft, each as specified or described in a Closing Notice delivered pursuant to the NPA or the related Participation Agreement, in each case as the same may be amended, supplemented
or otherwise modified from time to time in accordance with its terms (including, as to each Indenture with respect to a Financed Aircraft, as amended pursuant to the applicable Indenture Amendment). 

Indenture Amendment: Means, with respect to an Indenture relating to a Financed Aircraft, the first amendment thereto,
dated as of the date hereof, between the Company and the Loan Trustee. 
 Intercreditor Agreement: Means the amended
and restated intercreditor agreement dated as of the date hereof among the Related Trustee (and after the Transfer Date, the Trustee), the Related Other Trustees (and after the Transfer Date, the Other Trustees) party thereto, the Liquidity
Provider, the liquidity provider relating to the Class AA Certificates and the Class A Certificates and Wilmington Trust, National Association, as Subordination Agent and as trustee thereunder, as may be further amended, supplemented or
otherwise modified from time to time in accordance with its terms. 
 Investors: Means the Underwriters, together with
all subsequent beneficial owners of the Applicable Certificates. 

  
 7 

 Liquidity Facility: Means, initially, the Revolving Credit Agreement dated
as of the date hereof relating to the Applicable Certificates, between the Liquidity Provider and Wilmington Trust, National Association, as Subordination Agent, as agent and trustee for the Applicable Trust, and, from and after the replacement of
such agreement pursuant to the Intercreditor Agreement, the replacement liquidity facility therefor, in each case as amended, supplemented or otherwise modified from time to time in accordance with their respective terms. 

Liquidity Provider: Means, with respect to the Applicable Certificates, initially, National Australia Bank Limited,
acting through its New York Branch, and any replacements or successors therefor appointed in accordance with the Intercreditor Agreement. 

Make-Whole Amount: Has the meaning specified in any Indenture. 

Note Documents: Means the Series B Equipment Notes with respect to the Applicable Certificates and, with respect to any
such Series B Equipment Note, the Indenture and the Participation Agreement relating to such Series B Equipment Note. 

NPA: Means the Original NPA, as amended by the NPA Amendment, providing for, among other things, the purchase of Series
B Equipment Notes by the Trustee on behalf of the Applicable Trust, as the same may be amended, supplemented or otherwise modified from time to time, in accordance with its terms. 

NPA Amendment: Means Amendment No. 1 to the Original NPA, dated as of the date hereof, among the Company, the Other
Trustees, the Trustee, the Subordination Agent, the Escrow Agent, the Escrow Paying Agent and the escrow agent relating the Class AA Certificates and the Class A Certificates. 

Original NPA: Means the Note Purchase Agreement, dated as of February 14, 2018, among the Company, the Related
Trustee (and after the Transfer Date, the Trustee), the Related Other Trustees (and after the Transfer Date, the Other Trustees), the Subordination Agent, the Escrow Agent, the Escrow Paying Agent and the escrow and paying agent with respect to the
Class AA and Class A Certificates, as amended, supplemented or otherwise modified from time to time in accordance with its terms. 

Other Agreements: Means (i) the Basic Agreement, as supplemented by Trust Supplement No. 2018-1AA-S dated February 14, 2018 relating to United Airlines Pass Through Trust
2018-1AA-S, (ii) the Basic Agreement, as supplemented by Trust Supplement No.
2018-1A-S dated as of February 14, 2018 relating to United Airlines Pass Through Trust
2018-1A-S, (iii) the Basic Agreement, as supplemented by a Trust Supplement relating to any Additional Trust and (iv) the Basic Agreement, as supplemented by a
Trust Supplement relating to any Refinancing Trust. 
 Other Trustees: Means the trustees under the Other Agreements,
and any successor or other trustee appointed as provided therein. 

  
 8 

 Other Trusts: Means the United Airlines Pass Through Trust 2018-1AA-S, the United Airlines Pass Through Trust 2018-1A-S, an Additional Trust or Trusts, if
any, and a Refinancing Trust or Trusts, if any, created by the Other Agreements. 
 Outstanding: When used with
respect to Applicable Certificates, means, as of the date of determination, all Transfer Date Certificates, and all other Applicable Certificates theretofore authenticated and delivered under the Agreement, in each case except: 

(i) Applicable Certificates theretofore canceled by the Registrar or delivered to the Trustee or the Registrar for
cancellation; 
 (ii) Applicable Certificates for which money in the full amount required to make the final distribution with
respect to such Applicable Certificates pursuant to Section 11.01 of the Basic Agreement has been theretofore deposited with the Trustee in trust for the Applicable Certificateholders as provided in Section 4.01 of the Basic Agreement
pending distribution of such money to such Applicable Certificateholders pursuant to payment of such final distribution; and 

(iii) Applicable Certificates in exchange for or in lieu of which other Applicable Certificates have been authenticated and
delivered pursuant to the Agreement. 
 Participation Agreement: Means each Participation Agreement entered into by
the Related Trustee, the Related Other Trustees pursuant to the Original NPA, as the same may be amended, supplemented or otherwise modified in accordance with its terms (including, as to each Participation Agreement with respect to a Financed
Aircraft, as amended pursuant to the applicable Participation Agreement Amendment). 
 Participation Agreement
Amendment: Means, with respect to each Participation Agreement relating to a Financed Aircraft, the first amendment thereto, dated as of the date hereof, among the initial parties to such Participation Agreement and the Trustee. 

Pool Balance: Means, as of any date, (i) the original aggregate face amount of the “Applicable
Certificates” (as defined in the Related Pass Through Trust Agreement), less (ii) the aggregate amount of all payments made as of such date in respect of such Certificates, the “Applicable Certificates” (as defined in the Related
Pass Through Trust Agreement) or the Deposits, other than payments made in respect of interest or premium (including Make-Whole Amount) thereon or reimbursement of any costs or expenses incurred in connection therewith. The Pool Balance as of any
date shall be computed after giving effect to any special distribution with respect to unused Deposits, payment of principal of the Series B Equipment Notes, or payment with respect to other Trust Property and the distribution thereof to be made on
that date. 

  
 9 

 Pool Factor: Means, as of any Distribution Date, the quotient (rounded to
the seventh decimal place) computed by dividing (i) the Pool Balance by (ii) the original aggregate face amount of the “Applicable Certificates” as defined in the Related Pass Through Trust Agreement. The Pool Factor as of any
Distribution Date shall be computed after giving effect to any special distribution with respect to unused Deposits, payment of principal of the Series B Equipment Notes, or payment with respect to other Trust Property and the distribution thereof
to be made on that date. 
 Prospectus Supplement: Means the final Prospectus Supplement dated May 9, 2018
relating to the offering of the Applicable Certificates. 
 Ratings Confirmation: Has the meaning specified in the
Amended and Restated Intercreditor Agreement. 
 Related Other Pass Through Trust Agreements: Means the “Other
Agreements” as defined in the Related Pass Through Trust Agreement. 
 Related Other Trustees: Means the
“Other Trustees” as defined in the Related Pass Through Trust Agreement. 
 Related Other Trusts: Means the
“Other Trusts” as defined in the Related Pass Through Trust Agreement. 
 Related Pass Through Trust
Agreement: Means the Basic Agreement as supplemented by the Related Pass Through Trust Supplement. 
 Related Pass
Through Trust Supplement: Means the Trust Supplement No. 2018-1B-O dated as of the date hereof, relating to the United Airlines Pass Through Trust 2018-1B-O and entered into by the Company and the Related Trustee, as amended, supplemented or otherwise modified from time to time in accordance with its terms. 

Related Trust: Means the United Airlines Pass Through Trust 2018-1B-O, formed
under the Related Pass Through Trust Agreement. 
 Related Trustee: Means the trustee under the Related Pass Through
Trust Agreement. 
 Scheduled Payment: Means, with respect to any Series B Equipment Note, (i) any payment of
principal or interest on such Series B Equipment Note (other than any such payment which is not in fact received by the Trustee or the Subordination Agent within five days of the date on which such payment is scheduled to be made) or (ii) any
payment of interest on the Applicable Certificates with funds drawn under the Liquidity Facility, which payment in any such case represents the installment of principal on such Series B Equipment Note at the stated maturity of such installment, the
payment of regularly scheduled interest accrued on the unpaid principal amount of such Series B Equipment Note, or both; provided, however, that any payment of principal, premium (including Make-Whole Amount), if any, or interest
resulting from the redemption or purchase of any Series B Equipment Note shall not constitute a Scheduled Payment. 

  
 10 

 Series B Equipment Notes: Means all of the Series B Equipment Notes issued
under the Indentures. 
 Special Payment: Means any payment (other than a Scheduled Payment) in respect of, or any
proceeds of, any Series B Equipment Note or Collateral (as defined in each Indenture). 
 Substitute Aircraft: Has the
meaning specified in the NPA. 
 Transfer Date: Means the moment of execution and delivery of the Assignment and
Assumption Agreement by each of the parties thereto. 
 Transfer Date Certificates: Has the
meaning specified in the definition of “Applicable Certificates”. 
 Triggering Event: Has the meaning
assigned to such term in the Intercreditor Agreement. 
 Trust Property: Means (i) subject to the Intercreditor
Agreement, the Series B Equipment Notes held as the property of the Applicable Trust, all monies at any time paid thereon or in respect thereof and all monies due and to become due thereunder, (ii) funds from time to time deposited in the
Certificate Account and the Special Payments Account and, subject to the Intercreditor Agreement, any proceeds from the sale by the Trustee pursuant to Article VI of the Basic Agreement of any Series B Equipment Note and (iii) all rights
of the Applicable Trust and the Trustee, on behalf of the Applicable Trust, under the Intercreditor Agreement, the Escrow Agreement, the NPA and the Liquidity Facility, including, without limitation, all rights to receive certain payments
thereunder, and all monies paid to the Trustee on behalf of the Applicable Trust pursuant to the Intercreditor Agreement or the Liquidity Facility, provided that rights with respect to the Deposits or under the Escrow Agreement will not constitute
Trust Property. 
 Trust Supplement: Has the meaning specified in the first paragraph of this trust supplement. 

Trustee: Has the meaning specified in the first paragraph of this Trust Supplement. 

Underwriters: Means, collectively, 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 and Wells Fargo Securities, LLC. 
 Underwriting Agreement: Means the
Underwriting Agreement related to the Applicable Certificates dated May 9, 2018 among Credit Suisse Securities (USA) LLC and Citigroup Global Markets Inc., as representatives of the several Underwriters, the Company and the Depositary, as the
same may be amended, supplemented or otherwise modified from time to time in accordance with its terms. 

  
 11 

 United Bankruptcy Event: Has the meaning specified in the Intercreditor
Agreement. 
 ARTICLE III 

DISTRIBUTIONS; STATEMENTS TO CERTIFICATEHOLDERS 

Section 3.01. Statements to Applicable Certificateholders. (a) On each Distribution Date, the Trustee will include with each
distribution to Applicable Certificateholders of a Scheduled Payment or Special Payment, as the case may be, a statement setting forth the information provided below (in the case of a Special Payment, reflecting in part the information provided by
the Escrow Paying Agent under the Escrow Agreement). Such statement shall set forth (per $1,000 face amount Applicable Certificate as to (ii), (iii), (iv) and (v) below) the following information: 

(i) The aggregate amount of funds distributed on such Distribution Date under the Agreement and under the Escrow Agreement,
indicating the amount allocable to each source, including any portion thereof paid by the Liquidity Provider; 
 (ii) The
amount of such distribution under the Agreement allocable to principal and the amount allocable to premium (including Make-Whole Amount), if any; 

(iii) The amount of such distribution under the Agreement allocable to interest; 

(iv) The amount of such distribution under the Escrow Agreement allocable to interest; 

(v) The amount of such distribution under the Escrow Agreement allocable to unused Deposits, if any; and 

(vi) The Pool Balance and the Pool Factor. 

With respect to the Applicable Certificates registered in the name of a Clearing Agency or its nominee, on the Record Date prior to each
Distribution Date, the Trustee will request that such Clearing Agency post on its Internet bulletin board a securities position listing setting forth the names of all Clearing Agency Participants reflected on such Clearing Agency’s books as
holding interests in the Applicable Certificates on such Record Date. On each Distribution Date, the Trustee will mail to each such Clearing Agency Participant the statement described above and will make available additional copies as requested by
such Clearing Agency Participant for forwarding to holders of interests in the Applicable Certificates. 

  
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 (b) Within a reasonable period of time after the end of each calendar year but not later than the
latest date permitted by law, the Trustee shall furnish to each Person who at any time during such calendar year was an Applicable Certificateholder of record a statement containing the sum of the amounts determined pursuant to clauses (a)(i),
(a)(ii), (a)(iii), (a)(iv) and (a)(v) above for such calendar year or, in the event such Person was an Applicable Certificateholder of record during a portion of such calendar year, for such portion of such year, and such other items as are readily
available to the Trustee and which an Applicable Certificateholder shall reasonably request as necessary for the purpose of such Applicable Certificateholder’s preparation of its U.S. federal income tax returns. Such statement and such other
items shall be prepared on the basis of information supplied to the Trustee by the Clearing Agency Participants and shall be delivered by the Trustee to such Clearing Agency Participants to be available for forwarding by such Clearing Agency
Participants to the holders of interests in the Applicable Certificates in the manner described in Section 3.01(a) of this Trust Supplement. 

(c) If the aggregate principal payments scheduled for a Regular Distribution Date prior to the Delivery Period Termination Date differ from the
amount thereof set forth for the Applicable Certificates on page S-38 of the Prospectus Supplement, by no later than the 15th day prior to such Regular Distribution Date, the Trustee (if the Related Trustee
has not already done so) shall mail written notice of the actual amount of such scheduled payments to the Applicable Certificateholders of record as of a date within 15 Business Days prior to the date of mailing. 

(d) Promptly following (i) the Delivery Period Termination Date, if there has been any change in the information set forth in clauses
(y) and (z) below from that set forth on page S-38 of the Prospectus Supplement, and (ii) the date of any early redemption of, or any default in the payment of principal or interest in respect of,
any of the Series B Equipment Notes held in the Applicable Trust, or any Final Withdrawal, the Trustee (if the Related Trustee has not already done so) shall furnish to Applicable Certificateholders of record on such date a statement setting forth
(x) the expected Pool Balances for each subsequent Regular Distribution Date following the Delivery Period Termination Date, (y) the related Pool Factors for such Regular Distribution Dates and (z) the expected principal payment
schedule of the Series B Equipment Notes, in the aggregate, held as Trust Property at the date of such notice. With respect to the Applicable Certificates registered in the name of a Clearing Agency, on the Transfer Date, the Trustee (if the Related
Trustee has not already done so) will request from such Clearing Agency a securities position listing setting forth the names of all Clearing Agency Participants reflected on such Clearing Agency’s books as holding interests in the
“Applicable Certificates” (as defined in the Related Pass Through Trust Agreement) on the Delivery Period Termination Date. The Trustee (if the Related Trustee has not already done so) will mail to each such Clearing Agency Participant the
statement described above and will make available additional copies as requested by such Clearing Agency Participant for forwarding to holders of interests in the Applicable Certificates. 

(e) The Trustee shall provide promptly to the Applicable Certificateholders all material
non-confidential information received by the Trustee from the Company. 
 (f) This Section 3.01
supersedes and replaces Section 4.03 of the Basic Agreement, with respect to the Applicable Trust. 

  
 13 

 Section 3.02. Special Payments Account. (a) The Trustee shall establish and
maintain on behalf of the Applicable Certificateholders a Special Payments Account as one or more accounts, which shall be non-interest bearing except as provided in Section 4.04 of the Basic Agreement.
The Trustee shall hold the Special Payments Account in trust for the benefit of the Applicable Certificateholders and shall make or permit withdrawals therefrom only as provided in the Agreement. On each day when one or more Special Payments are
made to the Trustee under the Intercreditor Agreement, the Trustee, upon receipt thereof, shall immediately deposit the aggregate amount of such Special Payments in the Special Payments Account. 

(b) This Section 3.02 supersedes and replaces Section 4.01(b) of the Basic Agreement in its entirety, with respect to the Applicable
Trust. 
 Section 3.03. Distributions from Special Payments Account. (a) On each Special Distribution Date with respect to
any Special Payment or as soon thereafter as the Trustee has confirmed receipt of any Special Payments due on the Series B Equipment Notes held (subject to the Intercreditor Agreement) in the Applicable Trust or realized upon the sale of such Series
B Equipment Notes, the Trustee shall distribute out of the Special Payments Account the entire amount of such Special Payment deposited therein pursuant to Section 3.02(a) of this Trust Supplement. There shall be so distributed to each
Applicable Certificateholder of record on the Record Date with respect to such Special Distribution Date (other than as provided in Section 7.01 of this Trust Supplement concerning the final distribution) by check mailed to such Applicable
Certificateholder, at the address appearing in the Register, such Applicable Certificateholder’s pro rata share (based on the Fractional Undivided Interest in the Applicable Trust held by such Applicable Certificateholder) of the total
amount in the Special Payments Account on account of such Special Payment, except that, with respect to Applicable Certificates registered on the Record Date in the name of a Clearing Agency (or its nominee), such distribution shall be made by wire
transfer in immediately available funds to the account designated by such Clearing Agency (or such nominee). 
 (b) The Trustee shall, at the
expense of the Company, cause notice of each Special Payment to be mailed to each Applicable Certificateholder at his address as it appears in the Register. In the event of redemption or purchase of Series B Equipment Notes held in the Applicable
Trust, such notice shall be mailed not less than 15 days prior to the Special Distribution Date for the Special Payment resulting from such redemption or purchase, which Special Distribution Date shall be the date of such redemption or purchase. In
the case of any other Special Payments, such notice shall be mailed as soon as practicable after the Trustee has confirmed that it has received funds for such Special Payment, stating the Special Distribution Date for such Special Payment which
shall occur not less than 15 days after the date of such notice and as soon as practicable thereafter. Notices with respect to a Special Payment mailed by the Trustee shall set forth: 

(i) The Special Distribution Date and the Record Date therefor (except as otherwise provided in Section 7.01 of this Trust
Supplement), 
 (ii) The amount of the Special Payment for each $1,000 face amount Applicable Certificate and the amount
thereof constituting principal, premium (including Make-Whole Amount), if any, and interest, 
 (iii) The reason for the
Special Payment, and 

  
 14 

 (iv) If the Special Distribution 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 Applicable Certificate. 
 If the amount of premium
(including Make-Whole Amount), if any, payable upon the redemption or purchase of a Series B Equipment Note has not been calculated at the time that the Trustee mails notice of a Special Payment, it shall be sufficient if the notice sets forth the
other amounts to be distributed and states that any premium (including Make-Whole Amount) received will also be distributed. 
 If any
redemption of the Series B Equipment Notes held in the Applicable Trust is canceled, the Trustee, as soon as possible after learning thereof, shall cause notice thereof to be mailed to each Applicable Certificateholder at its address as it appears
on the Register. 
 (c) This Section 3.03 supersedes and replaces Section 4.02(b) and Section 4.02(c) of the Basic Agreement
in their entirety, with respect to the Applicable Trust. 
 Section 3.04. Limitation of Liability for Payments.
Section 3.09 of the Basic Agreement shall be amended, with respect to the Applicable Trust, by deleting the phrase “the Owner Trustees or the Owner Participants” in the second sentence thereof and adding in lieu thereof “the
Liquidity Provider”. 
 ARTICLE IV 

DEFAULT 
 Section 4.01.
Purchase Rights of Certificateholders. (a) By acceptance of its Applicable Certificate, each Applicable Certificateholder agrees that at any time after the occurrence and during the continuation of a Certificate Buyout Event: 

(i) So long as no Additional Certificateholder has elected to exercise its rights to purchase Certificates pursuant to, and
given notice of such election in accordance with, Section 4.01(a)(ii) (upon such election and notification thereof, the right specified in this Section 4.01(a)(i) shall be suspended and (x) upon consummation of such purchase pursuant
to such election, be terminated with respect to such Certificate Buyout Event, or (y) upon failure to consummate such purchase on the proposed purchase date, such right shall be reinstated), each Applicable Certificateholder (other than the
Company or any of its Affiliates) shall have the right to purchase, for the purchase price set forth in the Class AA Trust Agreement and in the Class A Trust Agreement, all, but not less than all, of the Class AA Certificates and the
Class A Certificates upon 15 days’ written notice to the Class AA Trustee, the Class A Trustee and each other Applicable Certificateholder, on the third Business Day next following the expiry of such 15-day notice period, provided that (A) if prior to the end of such 15-day period any other Applicable Certificateholder (other than the Company or any of its
Affiliates) notifies such purchasing Applicable Certificateholder that such other Applicable Certificateholder wants to participate in such purchase, then such other Applicable Certificateholder (other than the Company or any of its Affiliates) may
join with the purchasing Applicable Certificateholder to purchase all, 

  
 15 

 
but not less than all, of the Class AA Certificates and the Class A Certificates pro rata based on the Fractional Undivided Interest in the Applicable Trust held by each such Applicable
Certificateholder and (B) if prior to the end of such 15-day period any other Applicable Certificateholder fails to notify the purchasing Applicable Certificateholder of such other Applicable
Certificateholder’s desire to participate in such a purchase, then such other Applicable Certificateholder shall lose its right to purchase the Class AA Certificates and the Class A Certificates pursuant to this
Section 4.01(a)(i); 
 (ii) If any Additional Certificates are issued pursuant to one or more Additional Trusts, each
Additional Certificateholder (other than the Company or any of its Affiliates) shall have the right (which shall not expire upon any purchase of the Class AA Certificates and the Class A Certificates pursuant to clause (i) above) to
purchase all, but not less than all, of the Class AA Certificates, the Class A Certificates, the Applicable Certificates and any Additional Certificates ranked senior to the Additional Certificates held by the purchasing Additional
Certificateholders upon 15 days’ written notice to the Trustee, the Class AA Trustee, the Class A Trustee and any Additional Trustee with respect to Additional Certificates that rank senior to the Additional Certificates held by the
purchasing Additional Certificateholders and each other Additional Certificateholder of the same class, on the third Business Day next following the expiry of such 15-day notice period, provided that
(A) if prior to the end of such 15-day period any other Additional Certificateholder of such class (other than the Company or any of its Affiliates) notifies such purchasing Additional Certificateholder
that such other Additional Certificateholder wants to participate in such purchase, then such other Additional Certificateholder (other than the Company or any of its Affiliates) may join with the purchasing Additional Certificateholder to purchase
all, but not less than all, of the Class AA Certificates, the Class A Certificates, the Applicable Certificates and such senior Additional Certificates pro rata based on the Fractional Undivided Interest in the applicable Additional Trust
held by each such Additional Certificateholder and (B) if prior to the end of such 15-day period any other Additional Certificateholder of such class fails to notify the purchasing Additional
Certificateholder of such other Additional Certificateholder’s desire to participate in such a purchase, then such other Additional Certificateholder shall lose its right to purchase the Class AA Certificates, the Class A
Certificates, the Applicable Certificates and such senior Additional Certificates pursuant to this Section 4.01(a)(ii); and 

(iii) If any Refinancing Certificates are issued, each Refinancing Certificateholder shall have the same right (subject to the
same terms and conditions) to purchase Certificates pursuant to this Section 4.01(a) (and to receive notice in connection therewith) as the Certificateholders of the Class that such Refinancing Certificates refinanced. 

The purchase price with respect to the Applicable Certificates shall be equal to the Pool Balance of the Applicable Certificates, together
with accrued and unpaid interest thereon to the date of such purchase, without premium (including Make-Whole Amount), but including any other amounts then due and payable to the Applicable Certificateholders under the Agreement, the Intercreditor
Agreement, the Escrow Agreement or any Note Document or on or in respect of 

  
 16 

 
the Applicable Certificates; provided, however, that no such purchase of Applicable Certificates shall be effective unless the purchaser(s) shall certify to the Trustee that
contemporaneously with such purchase, such purchaser(s) is (are) purchasing, pursuant to the terms of the Agreement and the Other Agreements, all of the Applicable Certificates, the Class AA Certificates, the Class A Certificates and, if
applicable, the Additional Certificates that rank senior to the Additional Certificates held by the purchasing Additional Certificateholder(s). Each payment of the purchase price of the Applicable Certificates referred to in the first sentence
hereof shall be made to an account or accounts designated by the Trustee and each such purchase shall be subject to the terms of this Section 4.01. Each Applicable Certificateholder agrees by its acceptance of its Applicable Certificate that
(at any time after the occurrence of a Certificate Buyout Event) it will, upon payment from Additional Certificateholder(s) or Refinancing Certificateholder(s), as the case may be, of the purchase price set forth in the first sentence of this
paragraph, (i) forthwith sell, assign, transfer and convey to the purchaser(s) thereof (without recourse, representation or warranty of any kind except for its own acts), all of the right, title, interest and obligation of such Applicable
Certificateholder in the Agreement, the Escrow Agreement, the Deposit Agreement, the Intercreditor Agreement, the Liquidity Facility, the NPA, the Note Documents and all Applicable Certificates and Escrow Receipts held by such Applicable
Certificateholder (excluding all right, title and interest under any of the foregoing to the extent such right, title or interest is with respect to an obligation not then due and payable as respects any action or inaction or state of affairs
occurring prior to such sale) (and the purchaser shall assume all of such Applicable Certificateholder’s obligations under the Agreement, the Escrow Agreement, the Deposit Agreement, the Intercreditor Agreement, the Liquidity Facility, the NPA,
the Note Documents and all such Applicable Certificates and Escrow Receipts), (ii) if such purchase occurs after a record date specified in Section 2.03 of the Escrow Agreement relating to the distribution of unused Deposits and/or accrued and
unpaid interest on Deposits and prior to or on the related distribution date thereunder, forthwith turn over to the purchaser(s) of its Applicable Certificate all amounts, if any, received by it on account of such distribution, and (iii) if
such purchase occurs after a Record Date relating to any distribution and prior to or on the related Distribution Date, forthwith turn over to the purchaser(s) of its Applicable Certificate all amounts, if any, received by it on account of such
distribution. The Applicable Certificates will be deemed to be purchased on the date payment of the purchase price is made notwithstanding the failure of the Applicable Certificateholders to deliver any Applicable Certificates and, upon such a
purchase, (I) the only rights of the Applicable Certificateholders will be to deliver the Applicable Certificates to the purchaser(s) and receive the purchase price for such Applicable Certificates and (II) if the purchaser(s) shall so
request, such Applicable Certificateholder will comply with all the provisions of Section 3.04 of the Basic Agreement to enable new Applicable Certificates to be issued to the purchaser in such denominations as it shall request. All charges and
expenses in connection with the issuance of any such new Applicable Certificates shall be borne by the purchaser thereof. 
 As used in this
Section 4.01 and elsewhere in this Trust Supplement, the terms “Additional Certificate”, “Additional Certificateholder”, “Additional Equipment Notes”, “Additional Trust”, “Class AA
Certificate”, “Class AA Trust Agreement”, “Class AA Trustee”, “Class A Certificate”, “Class A Trust Agreement”, “Class A Trustee” “Refinancing Certificates”,
“Refinancing Certificateholder”, “Refinancing Equipment Notes” and “Refinancing Trust” shall have the respective meanings assigned to such terms in the Intercreditor Agreement. 

  
 17 

 (b) This Section 4.01 supersedes and replaces Section 6.01(b) of the Basic Agreement,
with respect to the Applicable Trust. 
 Section 4.02. Amendment of Section 6.05 of the Basic Agreement.
Section 6.05 of the Basic Agreement shall be amended, with respect to the Applicable Trust, by deleting the phrase “and thereby annul any Direction given by such Certificateholders or the Trustee to such Loan Trustee with respect
thereto,” set forth in the first sentence thereof. 
 ARTICLE V 

THE TRUSTEE 
 Section 5.01.
Acquisition of Trust Property. (a) The Trustee is hereby irrevocably authorized and directed to execute and deliver the Assignment and Assumption Agreement on the date specified in Section 7.01 of the Related Pass Through Trust
Supplement, subject only to the satisfaction of the conditions set forth in said Section 7.01. The Agreement (except only for this sentence and the immediately preceding sentence hereof, which are effective upon execution and delivery hereof)
shall become effective upon the execution and delivery of the Assignment and Assumption Agreement by the Trustee and the Related Trustee, automatically and without any further signature or action on the part of the Company and the Trustee, and shall
thereupon constitute the legal, valid and binding obligation of the parties hereto enforceable against each of the parties hereto in accordance with its terms. Upon such execution and delivery of the Assignment and Assumption Agreement, the Related
Trust shall be terminated, the Applicable Certificateholders shall receive beneficial interests in the Applicable Trust in exchange for their interests in the Related Trust equal to their respective beneficial interests in the Related Trust and the
“Outstanding” (as defined in the Related Pass Through Trust Agreement) pass through certificates representing Fractional Undivided Interests in the Related Trust shall be deemed for all purposes of the Agreement, without further signature
or action of any party or Certificateholder, to be Certificates representing the same Fractional Undivided Interests in the Applicable Trust and Trust Property. By acceptance of its Applicable Certificate, each Applicable Certificateholder consents
to and ratifies such assignment, transfer and delivery of the trust property of the Related Trust to the Trustee upon the execution and delivery of the Assignment and Assumption Agreement. The provisions of this Section 5.01(a) supersede and
replace the provisions of Section 2.02 of the Basic Agreement with respect to the Applicable Trust, and all provisions of the Basic Agreement relating to Postponed Notes or Section 2.02 of the Basic Agreement shall not apply to the
Applicable Trust. 
 (b) The Trustee, upon the execution and delivery of the Assignment and Assumption Agreement, acknowledges its acceptance
of all right, title and interest in and to the Trust Property and declares that the Trustee holds and will hold such right, title and interest for the benefit of all then present and future Applicable Certificateholders, upon the trusts herein and
in the Basic Agreement set forth. By the acceptance of each Applicable Certificate issued to it under the Related Pass Through Trust Agreement and deemed issued under the Agreement, each Holder of any such Applicable Certificate as grantor of the
Applicable Trust thereby joins in the creation and declaration of the Applicable Trust. The provisions of this Section 5.01(b) supersede and replace the provisions of Section 2.03 of the Basic Agreement, with respect to the Applicable
Trust. 

  
 18 

 Section 5.02. [Intentionally Omitted]. 

Section 5.03. The Trustee. (a) Subject to Section 5.04 of this Trust Supplement and Section 7.15 of the Basic
Agreement, the Trustee shall not be responsible in any manner whatsoever for or in respect of the validity or sufficiency of this Trust Supplement, the Deposit Agreement, the NPA Amendment (and the NPA as amended thereby) or the Escrow Agreement or
the due execution hereof or thereof by the Company or the other parties thereto (other than the Trustee), or for or in respect of the recitals and statements contained herein or therein, all of which recitals and statements are made solely by the
Company, except that the Trustee hereby represents and warrants that each of this Trust Supplement, the Basic Agreement, each Applicable Certificate, the Intercreditor Agreement, the NPA Amendment (and the NPA as amended thereby) and the Escrow
Agreement has been executed and delivered by one of its officers who is duly authorized to execute and deliver such document on its behalf. 

(b) Except as herein otherwise provided and except during the continuation of an Event of Default in respect of the Applicable Trust created
hereby, no duties, responsibilities or liabilities are assumed, or shall be construed to be assumed, by the Trustee by reason of this Trust Supplement other than as set forth in the Agreement, and this Trust Supplement is executed and accepted on
behalf of the Trustee, subject to all the terms and conditions set forth in the Agreement, as fully to all intents as if the same were herein set forth at length. 

Section 5.04. Representations and Warranties of the Trustee. The Trustee hereby represents and warrants that, on the Transfer
Date: 
 (a) The Trustee has full power, authority and legal right to receive the Trust Property assigned by the Related
Trustee, assume the obligations under, and perform, the Assignment and Assumption Agreement, this Trust Supplement, the Intercreditor Agreement, the Escrow Agreement, the NPA and the Note Documents to which it is a party and has taken all necessary
action to authorize such receipt, assumption and performance by it of this Trust Supplement, the Intercreditor Agreement, the Escrow Agreement, the NPA and the Note Documents to which it is or is to become a party; 

(b) The receipt of the Trust Property under the Assignment and Assumption Agreement and the performance by the Trustee of the
Assignment and Assumption Agreement, this Trust Supplement, the Intercreditor Agreement, the Escrow Agreement, the NPA Amendment (and the NPA as amended thereby) and the Note Documents to which it is or is to become a party (i) will not violate
any provision of any United States federal law or the law of the state of the United States where it is located governing the banking and trust powers of the Trustee or any order, writ, judgment, or decree of any court, arbitrator or governmental
authority applicable to the Trustee or any of its assets, (ii) will not violate any provision of the articles of association or by-laws of the Trustee, and (iii) will not violate any provision of, or
constitute, with or without notice or lapse of time, a default under, or result in the creation or imposition of any lien on any properties 

  
 19 

 
included in the Trust Property pursuant to the provisions of any mortgage, indenture, contract, agreement or other undertaking to which it is a party, which violation, default or lien could
reasonably be expected to have an adverse effect on the Trustee’s performance or ability to perform its duties hereunder or thereunder or on the transactions contemplated herein or therein; 

(c) The receipt of the Trust Property under the Assignment and Assumption Agreement and the performance by the Trustee of the
Assignment and Assumption Agreement, this Trust Supplement, the Intercreditor Agreement, the Escrow Agreement, the NPA Amendment (and the NPA as amended thereby) and the Note Documents to which it is or is to become a party will not require the
authorization, consent, or approval of, the giving of notice to, the filing or registration with, or the taking of any other action in respect of, any governmental authority or agency of the United States or the state of the United States where it
is located regulating the banking and corporate trust activities of the Trustee; and 
 (d) The Assignment and Assumption
Agreement has been duly executed and delivered by the Trustee and this Trust Supplement, the Intercreditor Agreement, the Escrow Agreement, the NPA Amendment (and the NPA as amended thereby) and the Note Documents to which it is or is to become a
party have been, or will be, as applicable, duly executed and delivered by the Trustee and constitute, or will constitute, as applicable, the legal, valid and binding agreements of the Trustee, enforceable against it in accordance with their
respective terms; provided, however, that enforceability may be limited by (i) applicable bankruptcy, insolvency, reorganization, moratorium or similar laws affecting the rights of creditors generally and (ii) general principles of equity.

 Section 5.05. Trustee Liens. The Trustee in its individual capacity agrees, in addition to the agreements contained in
Section 7.17 of the Basic Agreement, that it will at its own cost and expense promptly take any action as may be necessary to duly discharge and satisfy in full any Trustee’s Liens on or with respect to the Trust Property which is
attributable to the Trustee in its individual capacity and which is unrelated to the transactions contemplated by the Intercreditor Agreement or the NPA. 

ARTICLE VI 
 ADDITIONAL AMENDMENT;
SUPPLEMENTAL AGREEMENTS 
 Section 6.01. Amendment of Section 5.02 of the Basic Agreement. Section 5.02
of the Basic Agreement shall be amended, with respect to the Applicable Trust, by (i) replacing the phrase “of the Note Documents and of this Agreement” set forth in paragraph (b) thereof with the phrase “of the Note
Documents, of the NPA and of this Agreement” and (ii) replacing the phrase “of this Agreement and any Note Document” set forth in the last paragraph of Section 5.02 with the phrase “of this Agreement, the NPA and any
Note Document”. 

  
 20 

 Section 6.02. Supplemental Agreements without Consent of Applicable
Certificateholders. Without limitation of Section 9.01 of the Basic Agreement, under the terms of, and subject to the limitations contained in, Section 9.01 of the Basic Agreement, the Company may (but will not be required to), and the
Trustee (subject to Section 9.03 of the Basic Agreement) shall, at the Company’s request, at any time and from time to time: 
 (i)
Enter into one or more agreements supplemental to the Escrow Agreement, the NPA or the Deposit Agreement for any of the purposes set forth in clauses (1) through (9) of such Section 9.01, and (without limitation of the foregoing or
Section 9.01 of the Basic Agreement) (a) clauses (2) and (3) of such Section 9.01 shall also be deemed to include the Company’s obligations under (in the case of clause (2)), and the Company’s rights and powers
conferred by (in the case of clause (3)), the NPA, and (b) references in clauses (4), (6) and (7) of such Section 9.01 to “any Intercreditor Agreement or any Liquidity Facility” shall also be deemed to refer to “the
Intercreditor Agreement, the Liquidity Facility, the Escrow Agreement, the NPA or the Deposit Agreement”, 
 (ii) Enter into one or more
agreements supplemental to the Agreement, the Intercreditor Agreement or the NPA to provide for the formation of one or more Additional Trusts, the issuance of Additional Certificates, the purchase by an Additional Trust (if any) of applicable
Additional Equipment Notes and other matters incidental thereto or otherwise contemplated by Section 2.01(b) of the Basic Agreement, subject to the provisions of Section 4(a)(vi) of the NPA and Section 9.1(d) of the Intercreditor
Agreement, and 
 (iii) Enter into one or more agreements supplemental to the Agreement to provide for the formation of one or more
Refinancing Trusts, the issuance of Refinancing Certificates, the purchase by any Refinancing Trust of applicable Refinancing Equipment Notes and other matters incidental thereto or as otherwise contemplated by Section 2.01(b) of the Basic
Agreement, subject to the provisions of Section 4(a)(vi) of the NPA and Section 9.1(c) of the Intercreditor Agreement. 

Section 6.03. Supplemental Agreements with Consent of Applicable Certificateholders. Without limitation of Section 9.02 of
the Basic Agreement, the provisions of Section 9.02 of the Basic Agreement shall apply to agreements or amendments for the purpose of adding any provisions to or changing in any manner or eliminating any of the provisions of the Escrow
Agreement, the Deposit Agreement, the Liquidity Facility or the NPA or modifying in any manner the rights and obligations of the Applicable Certificateholders under the Escrow Agreement, the Deposit Agreement, the Liquidity Facility or the NPA;
provided that the provisions of Section 9.02(1) of the Basic Agreement shall be deemed to include reductions in any manner of, or delay in the timing of, any receipt by the Applicable Certificateholders of payments upon the Deposits. 

Section 6.04. Consent of Holders of Certificates Issued under Other Trusts. Notwithstanding any provision in Section 6.02 or
Section 6.03 of this Trust Supplement to the contrary, no amendment or modification of Section 4.01 of this Trust Supplement shall be effective unless the trustee for each Class of Certificates affected by such amendment or
modification shall have consented thereto. 

  
 21 

 ARTICLE VII 

TERMINATION OF TRUST 

Section 7.01. Termination of the Applicable Trust. (a) The respective obligations and responsibilities of the Company and the
Trustee with respect to the Applicable Trust shall terminate upon the distribution to all Applicable Certificateholders and the Trustee of all amounts required to be distributed to them pursuant to the Agreement and the disposition of all property
held as part of the Trust Property; provided, however, that in no event shall the Applicable Trust continue beyond one hundred ten (110) years following the date of the execution of this Trust Supplement. 

Notice of any termination, specifying the Distribution Date upon which the Applicable Certificateholders may surrender their Applicable
Certificates to the Trustee for payment of the final distribution and cancellation, shall be mailed promptly by the Trustee to Applicable Certificateholders not earlier than the 60th day and not later than the 15th day next preceding such final
Distribution Date specifying (A) the Distribution Date upon which the proposed final payment of the Applicable Certificates will be made upon presentation and surrender of Applicable Certificates at the office or agency of the Trustee therein
specified, (B) the amount of any such proposed final payment, and (C) that the Record Date otherwise applicable to such Distribution Date is not applicable, payments being made only upon presentation and surrender of the Applicable
Certificates at the office or agency of the Trustee therein specified. The Trustee shall give such notice to the Registrar at the time such notice is given to Applicable Certificateholders. Upon presentation and surrender of the Applicable
Certificates in accordance with such notice, the Trustee shall cause to be distributed to Applicable Certificateholders such final payments. 

In the event that all of the Applicable Certificateholders shall not surrender their Applicable Certificates for cancellation within six
months after the date specified in the above-mentioned written notice, the Trustee shall give a second written notice to the remaining Applicable Certificateholders to surrender their Applicable Certificates
for cancellation and receive the final distribution with respect thereto. No additional interest shall accrue on the Applicable Certificates after the Distribution Date specified in the first written notice. In the event that any money held by the
Trustee for the payment of distributions on the Applicable Certificates shall remain unclaimed for two years (or such lesser time as the Trustee shall be satisfied, after sixty days’ notice from the Company, is one month prior to the escheat
period provided under applicable law) after the final distribution date with respect thereto, the Trustee shall pay to each Loan Trustee the appropriate amount of money relating to such Loan Trustee and shall give written notice thereof to the
Company. 
 (b) The provisions of this Section 7.01 supersede and replace the provisions of Section 11.01 of the Basic Agreement in
its entirety, with respect to the Applicable Trust. 

  
 22 

 ARTICLE VIII 

MISCELLANEOUS PROVISIONS 

Section 8.01. Basic Agreement Ratified. Except and so far as herein expressly provided, all of the provisions, terms and
conditions of the Basic Agreement are in all respects ratified and confirmed; and the Basic Agreement and this Trust Supplement shall be taken, read and construed as one and the same instrument. All replacements of provisions of, and other
modifications of the Basic Agreement set forth in this Trust Supplement are solely with respect to the Applicable Trust. 

Section 8.02. GOVERNING LAW. THE AGREEMENT AND THE APPLICABLE CERTIFICATES SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE
WITH THE LAWS OF THE STATE OF NEW YORK. THIS SECTION 8.02 SUPERSEDES AND REPLACES SECTION 12.05 OF THE BASIC AGREEMENT, WITH RESPECT TO THE APPLICABLE TRUST. 

Section 8.03. Execution in Counterparts. This Trust Supplement may be executed in any number of counterparts, each of which shall
be an original, but such counterparts shall together constitute but one and the same instrument. 
 Section 8.04. Intention of
Parties. The parties hereto intend that the Applicable Trust be classified for U.S. federal income tax purposes as a grantor trust under Subpart E, Part I of Subchapter J of the Internal Revenue Code of 1986, as amended, and not as a trust or
association taxable as a corporation or as a partnership. Each Applicable Certificateholder and Investor, by its acceptance of its Applicable Certificate or a beneficial interest therein, agrees to treat the Applicable Trust as a grantor trust for
all U.S. federal, state and local income tax purposes. The powers granted and obligations undertaken pursuant to the Agreement shall be so construed so as to further such intent. 

  
 23 

 IN WITNESS WHEREOF, the Company and the Trustee have caused this Trust Supplement to be duly
executed by their respective officers thereto duly authorized, as of the day and year first written above. 
  

			
	UNITED AIRLINES, INC.
		
	By:	 	 /s/ Ted Davidson

		 	Name: Ted Davidson
		 	Title:   Vice President Procurement
	
	WILMINGTON TRUST, NATIONAL ASSOCIATION,
		 	as Trustee
		
	By:	 	 /s/ Jacqueline Solone

		 	Name: Jacqueline Solone
		 	Title:   Vice President

 Signature Page to Class B-S Trust Supplement 18-1EX-4.3

 Exhibit 4.3 

EXECUTION VERSION 
  

 
  

REVOLVING CREDIT AGREEMENT 

(2018-1B) 

dated as of May 23, 2018 

between 
 WILMINGTON TRUST,
NATIONAL ASSOCIATION, 
 as Subordination Agent, 

as Agent and Trustee for the 

United Airlines Pass Through Trust 2018-1B, 

as Borrower 
 and 

NATIONAL AUSTRALIA BANK LIMITED, 

ACTING THROUGH ITS NEW YORK BRANCH, 

as Liquidity Provider 
  

 
 Relating to
United Airlines 
 Pass Through Trust 2018-1B 4.60% United Airlines 

Pass Through Certificates, Series 2018-1B 

 
  

 
  

 

 TABLE OF CONTENTS 

 

							
	 	 	 	  	Page	 
		
	 ARTICLE I DEFINITIONS
	  	 	1	 
			
	 Section 1.01
	 	Certain Defined Terms	  	 	1	 
		
	 ARTICLE II AMOUNT AND TERMS OF THE COMMITMENT
	  	 	8	 
			
	 Section 2.01
	 	The Advances	  	 	8	 
	 Section 2.02
	 	Making the Advances	  	 	8	 
	 Section 2.03
	 	Fees	  	 	10	 
	 Section 2.04
	 	Reductions or Termination of the Maximum Commitment	  	 	10	 
	 Section 2.05
	 	Repayments of Interest Advances, the Special Termination Advance or the Final Advance	  	 	11	 
	 Section 2.06
	 	Repayments of Provider Advances	  	 	12	 
	 Section 2.07
	 	Payments to the Liquidity Provider Under the Intercreditor Agreement	  	 	13	 
	 Section 2.08
	 	Book Entries	  	 	13	 
	 Section 2.09
	 	Payments from Available Funds Only	  	 	13	 
	 Section 2.10
	 	Non-Extension of the Expiry Date; Non-Extension Advance	  	 	14	 
		
	 ARTICLE III OBLIGATIONS OF THE BORROWER
	  	 	14	 
			
	 Section 3.01
	 	Increased Costs	  	 	14	 
	 Section 3.02
	 	Capital Adequacy and Liquidity Coverage	  	 	15	 
	 Section 3.03
	 	Payments Free of Deductions	  	 	16	 
	 Section 3.04
	 	Payments	  	 	18	 
	 Section 3.05
	 	Computations	  	 	18	 
	 Section 3.06
	 	Payment on Non-Business Days	  	 	18	 
	 Section 3.07
	 	Interest	  	 	18	 
	 Section 3.08
	 	Replacement of Borrower	  	 	20	 
	 Section 3.09
	 	Funding Loss Indemnification	  	 	20	 
	 Section 3.10
	 	Illegality	  	 	20	 
		
	 ARTICLE IV CONDITIONS PRECEDENT
	  	 	21	 
			
	 Section 4.01
	 	Conditions Precedent to Effectiveness of Section 2.01	  	 	21	 
	 Section 4.02
	 	Conditions Precedent to Borrowing	  	 	23	 
	 Section 4.03
	 	Representations and Warranties	  	 	23	 
		
	 ARTICLE V COVENANTS
	  	 	23	 
			
	 Section 5.01
	 	Affirmative Covenants of the Borrower	  	 	23	 
	 Section 5.02
	 	Negative Covenants of the Borrower	  	 	23	 

  
 i 

 TABLE OF CONTENTS 

(continued) 
  

							
	 	 	 	  	Page	 
		
	 ARTICLE VI LIQUIDITY EVENTS OF DEFAULT AND SPECIAL TERMINATION
	  	 	24	 
			
	 Section 6.01
	 	Liquidity Events of Default	  	 	24	 
	 Section 6.02
	 	Special Termination	  	 	24	 
		
	 ARTICLE VII MISCELLANEOUS
	  	 	24	 
			
	 Section 7.01
	 	Amendments, Etc.	  	 	24	 
	 Section 7.02
	 	Notices, Etc.	  	 	25	 
	 Section 7.03
	 	No Waiver; Remedies	  	 	25	 
	 Section 7.04
	 	Further Assurances	  	 	25	 
	 Section 7.05
	 	Indemnification; Survival of Certain Provisions	  	 	25	 
	 Section 7.06
	 	Liability of the Liquidity Provider	  	 	26	 
	 Section 7.07
	 	Costs, Expenses and Taxes	  	 	26	 
	 Section 7.08
	 	Binding Effect; Participations	  	 	27	 
	 Section 7.09
	 	Severability	  	 	28	 
	 Section 7.10
	 	GOVERNING LAW	  	 	28	 
	 Section 7.11
	 	Submission to Jurisdiction; Waiver of Jury Trial; Waiver of Immunity	  	 	28	 
	 Section 7.12
	 	Execution in Counterparts	  	 	29	 
	 Section 7.13
	 	Entirety	  	 	29	 
	 Section 7.14
	 	Headings	  	 	29	 
	 Section 7.15
	 	Transfer	  	 	30	 
	 Section 7.16
	 	LIQUIDITY PROVIDER’S OBLIGATION TO MAKE ADVANCES	  	 	30	 
	 Section 7.17
	 	Patriot Act	  	 	30	 
	 Section 7.18
	 	Head Office Obligations	  	 	30	 

  

					
	Schedule A	  	—  	  	Certain Economic Terms
	Schedule B	  	—  	  	Administration Details
	Annex I	  	—  	  	Interest Advance Notice of Borrowing
	Annex II	  	—  	  	Non-Extension Advance Notice of Borrowing
	Annex III	  	—  	  	Downgrade Advance Notice of Borrowing
	Annex IV	  	—  	  	Final Advance Notice of Borrowing
	Annex V	  	—  	  	Notice of Termination
	Annex VI	  	—  	  	Notice of Replacement Subordination Agent
	Annex VII	  	—  	  	Special Termination Advance Notice of Borrowing
	Annex VIII	  	—  	  	Notice of Special Termination

  

  
 ii 

 REVOLVING CREDIT AGREEMENT (2018-1B) 

THIS REVOLVING CREDIT AGREEMENT (2018-1B) dated as of May 23, 2018 (the
“Agreement”), between WILMINGTON TRUST, NATIONAL ASSOCIATION, a national banking association, not in its individual capacity but solely as Subordination Agent under the Intercreditor Agreement (each as defined below),
as agent and trustee for the Class B Trust (as defined below) (the “Borrower”), and NATIONAL AUSTRALIA BANK LIMITED, an Australian corporation, acting through its New York branch (the “Liquidity
Provider”). 
 W I T N E S S E T H: 

WHEREAS, pursuant to the Class B Trust Agreement (such term and all other capitalized terms used in these recitals having the
meanings set forth or referred to in Section 1.01), the Class B Trust is issuing the Class B Certificates; and 

WHEREAS, the Borrower, in order to support the timely payment of a portion of the interest on the Class B Certificates in
accordance with their terms, has requested the Liquidity Provider to enter into this Agreement, providing in part for the Borrower to request in specified circumstances that Advances be made hereunder. 

NOW, THEREFORE, in consideration of the premises, the parties hereto agree as follows: 

ARTICLE I 

DEFINITIONS 

Section 1.01 Certain Defined Terms. (a) Definitions. As used in this Agreement and unless otherwise expressly
indicated, or unless the context clearly requires otherwise, the following capitalized terms shall have the following respective meanings for all purposes of this Agreement: 

“Additional Costs” has the meaning assigned to such term in Section 3.01. 

“Advance” means an Interest Advance, a Final Advance, a Provider Advance, a Special Termination Advance, an Applied
Special Termination Advance, or an Applied Provider Advance, as the case may be. 
 “Applicable Liquidity Rate” has
the meaning assigned to such term in Section 3.07(h). 
 “Applicable Margin” means (x) with respect to any
Unpaid Advance (including, without limitation, any Applied Special Termination Advance but excluding any Unapplied Special Termination Advance) or Applied Provider Advance, the margin per annum specified in item 1 of Schedule A, or
(y) with respect to any Unapplied Provider Advance or any Unapplied Special Termination Advance, the margin per annum specified in the Fee Letter applicable to this Agreement. 

 [Revolving Credit Agreement (2018-1B)] 

 

 “Applied Downgrade Advance” has the meaning assigned to such term in
Section 2.06(a). 
 “Applied Non-Extension Advance” has the meaning
assigned to such term in Section 2.06(a). 
 “Applied Provider Advance” has the meaning assigned to such term
in Section 2.06(a). 
 “Applied Special Termination Advance” has the meaning assigned to such term in
Section 2.05. 
 “Assignment and Assumption Agreement” means the Assignment and Assumption Agreement to be
entered into between the Borrower and the trustee of the Successor Trust, substantially in the form of Exhibit C to the Trust Supplement No. 2018-1B-O, dated
as of the date hereof, relating to the Class B Trust. 
 “Bail-in
Action” means the application of any write-down or conversion powers by an EEA Resolution Authority in respect of any liability of an EEA Financial Institution. 

“Base Rate” means, for any given day, a fluctuating interest rate per annum in effect from time to time, which rate
per annum shall at all times be equal to (a) the weighted average of the rates on overnight Federal funds transactions with members of the Federal Reserve System arranged by Federal funds brokers, as published for such day (or, if such day is
not a Business Day, for the next preceding Business Day) by the Federal Reserve Bank of New York, or if such rate is not so published for any day that is a Business Day, the average of the quotations for such day for such transactions received by
the Liquidity Provider from three Federal funds brokers of recognized standing selected by it, plus (b) one-quarter of one percent ( 1⁄4 of 1%). 
 “Base Rate Advance” means an Advance that bears interest at a rate
based upon the Base Rate. 
 “Basel III” has the meaning assigned to such term in Section 3.01. 

“Borrower” has the meaning assigned to such term in the recital of parties to this Agreement. 

“Borrowing” means the making of Advances requested by delivery of a Notice of Borrowing. 

“Business Day” means any day other than a Saturday or Sunday or a day on which commercial banks are required or
authorized to close in Chicago, Illinois, New York, New York or, so long as any Class B Certificate is outstanding, the city and state in which the Class B Trustee, the Borrower or any Loan Trustee maintains its Corporate Trust Office or
receives or disburses funds, and, if the applicable Business Day relates to any Advance or other amount bearing interest based on the LIBOR Rate, on which dealings in dollars are carried on in the London interbank market. 

  
 2 

 [Revolving Credit Agreement (2018-1B)] 

 

 “Deposit Agreement” means the Deposit Agreement dated as of the date
hereof between U.S. Bank National Association, as Escrow Agent, and Citibank, N.A., as Depositary, pertaining to the Class B Certificates, as the same may be amended, modified or supplemented from time to time in accordance with the terms
thereof. 
 “Depositary” has the meaning assigned to such term in the Deposit Agreement. 

“Deposits” has the meaning assigned to such term in the Deposit Agreement. 

“Downgrade Advance” means an Advance made pursuant to Section 2.02(c). 

“EEA Financial Institution” means (a) any credit institution or investment firm established in any EEA Member
Country which is subject to the supervision of an EEA Resolution Authority, (b) any entity established in an EEA Member Country which is a parent of an institution described in clause (a) of this definition, or (c) any financial
institution established in an EEA Member Country which is a subsidiary of an institution described in clauses (a) or (b) of this definition and is subject to consolidated supervision with its parent. 

“EEA Member Country” means any of the member states of the European Union, Iceland, Liechtenstein, and Norway. 

“EEA Resolution Authority” means any public administrative authority or any person entrusted with public
administrative authority of any EEA Member Country (including any delegee) having responsibility for the resolution of any EEA Financial Institution. 

“Effective Date” has the meaning assigned to such term in Section 4.01. The delivery of the certificate of the
Liquidity Provider contemplated by Section 4.01(e) shall be conclusive evidence that the Effective Date has occurred. 

“Excluded Taxes” means (i) taxes imposed on the overall net income of the Liquidity Provider or of its Facility
Office by the jurisdiction where such Liquidity Provider’s principal office or such Facility Office is located, and (ii) Excluded Withholding Taxes. 

“Excluded Withholding Taxes” means (i) withholding Taxes imposed by the United States except to the extent that
such United States withholding Taxes are imposed or increased as a result of any change in applicable law (excluding from change in applicable law for this purpose a change in an applicable treaty or other change in law affecting the applicability
of a treaty) after the date hereof, or in the case of a successor Liquidity Provider (including a transferee of an Advance) or Facility Office, after the date on which such successor Liquidity Provider obtains its interest or on which the Facility
Office is changed, (ii) any withholding Taxes imposed by the United States which are imposed or increased as a result of the Liquidity Provider failing to deliver to the Borrower any certificate or document (which certificate or document in the
good faith judgment of the Liquidity Provider it is legally entitled to provide) which is reasonably requested by the Borrower to establish that payments under this Agreement are exempt from (or entitled to a reduced rate of) withholding Tax and
(iii) Taxes imposed under Sections 1471 through 1474 of the Internal Revenue Code of 1986, as amended. 

  
 3 

 [Revolving Credit Agreement (2018-1B)] 

 

 “Expenses” means liabilities, obligations, damages, settlements,
penalties, claims, actions, suits, costs, expenses, and disbursements (including, without limitation, reasonable fees and disbursements of legal counsel and costs of investigation), provided that Expenses shall not include any Taxes. 

“Expiry Date” means the “Initial Expiry Date” specified in item 2 of Schedule A, initially, or any
subsequent anniversary date of the Class B Closing Date to which the Expiry Date is automatically extended pursuant to Section 2.10 if the Liquidity Provider has not provided notice in accordance with Section 2.10 that its obligation
to make Advances shall not be extended beyond such anniversary date. 
 “Facility Office” means the office of the
Liquidity Provider presently located in New York, New York or such other office as the Liquidity Provider from time to time shall notify the Borrower as its Facility Office hereunder; provided that the Liquidity Provider shall not change its
Facility Office to another Facility Office outside the United States of America except in accordance with Section 3.01, 3.02 or 3.03 hereof or with the prior consent of United Airlines, Inc. 

“Final Advance” means an Advance made pursuant to Section 2.02(d). 

“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
Securities and Exchange Commission 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. 

“Head Office” has the meaning assigned to such term in Section 7.18. 

“Intercreditor Agreement” means the Amended and Restated Intercreditor Agreement dated as of the date hereof among the
Trustees, the Liquidity Provider, the liquidity provider under the other Liquidity Facilities and the Subordination Agent, as the same may be amended, supplemented or otherwise modified from time to time in accordance with its terms. 

“Interest Advance” means an Advance made pursuant to Section 2.02(a). 

“Interest Period” means, with respect to any LIBOR Advance, each of the following periods: 

(i) the period beginning on the third LIBOR Business Day following either (x) the date of the Liquidity Provider’s
receipt of the Notice of Borrowing for such LIBOR Advance or (y) the date of the withdrawal of funds from the Class B Cash Collateral Account for the purpose of paying interest on the Class B Certificates as contemplated by
Section 2.06(a) hereof and, in either case, ending on the next Regular Distribution Date (or, if such day is not a Business Day, the next succeeding Business Day); and 

  
 4 

 [Revolving Credit Agreement (2018-1B)] 

 

 (ii) each subsequent period commencing on the last day of the immediately
preceding Interest Period and ending on the next Regular Distribution Date (or, if such day is not a Business Day, the next succeeding Business Day); 

provided, however, that if (x) the Final Advance shall have been made, or (y) other outstanding Advances shall have been converted
into the Final Advance, then the Interest Periods shall be successive periods of one month beginning on the third LIBOR Business Day following the Liquidity Provider’s receipt of the Notice of Borrowing for such Final Advance (in the case of
clause (x) above) or the Regular Distribution Date (or, if such day is not a Business Day, the next succeeding Business Day) following such conversion (in the case of clause (y) above). 

“LIBOR Advance” means an Advance bearing interest at a rate based upon the LIBOR Rate. 

“LIBOR Business Day” means any day on which dealings in dollars are carried on in the London interbank market. 

“LIBOR Rate” means, with respect to any Interest Period, 

(i) the rate per annum appearing on display page Reuters Screen LIBOR01 Page (or any successor or substitute therefor) at
approximately 11:00 a.m. (London time) two LIBOR Business Days before the first day of such Interest Period, as the rate for dollar deposits with a maturity comparable to such Interest Period, or 

(ii) if the rate calculated pursuant to clause (i) above is not available, the average (rounded upwards, if necessary, to
the next 1/16 of 1%) of the rates per annum at which deposits in dollars are offered for the relevant Interest Period by three banks of recognized standing selected by the Liquidity Provider in the London interbank market at approximately
11:00 a.m. (London time) two LIBOR Business Days before the first day of such Interest Period in an amount approximately equal to the principal amount of the LIBOR Advance to which such Interest Period is to apply and for a period comparable to
such Interest Period; 
 provided that if the LIBOR Rate determined as provided above with respect to any Interest Period would be less than 0% per annum,
then the LIBOR Rate for such Interest Period shall be deemed to be 0%. 
 “Liquidity Event of Default” means the
occurrence of either (a) the Acceleration of all of the Equipment Notes (provided that, with respect to the period prior to the Delivery Period Expiry Date, such Equipment Notes have an aggregate outstanding principal balance in excess of the
amount specified in item 3 on Schedule A) or (b) a United Bankruptcy Event. 
 “Liquidity Indemnitee” means
(i) the Liquidity Provider, (ii) the directors, officers, employees and agents of the Liquidity Provider, and (iii) the successors and permitted assigns of the persons described in clauses (i) and (ii) inclusive. 

“Liquidity Provider” has the meaning assigned to such term in the recital of parties to this Agreement. 

  
 5 

 [Revolving Credit Agreement (2018-1B)] 

 

 “Maximum Available Commitment” means, subject to the proviso
contained in the third sentence of Section 2.02(a), at any time of determination, (a) the Maximum Commitment at such time less (b) the aggregate amount of each Interest Advance outstanding at such time; provided that following a
Downgrade Advance (subject to any reinstatement of the obligations of the Liquidity Provider pursuant to Section 2.06(d)), a Non-Extension Advance, a Special Termination Advance or a Final Advance, the
Maximum Available Commitment shall be zero. 
 “Maximum Commitment” means initially the amount specified in item 4
on Schedule A, as such amount may be reduced from time to time in accordance with Section 2.04(a). 
 “Non-Excluded Tax” has the meaning assigned to such term in Section 3.03(a). 

“Non-Extension Advance” means an Advance made pursuant to
Section 2.02(b). 
 “Notice Date” has the meaning assigned to such term in Section 2.10. 

“Notice of Borrowing” has the meaning assigned to such term in Section 2.02(e). 

“Notice of Replacement Subordination Agent” has the meaning assigned to such term in Section 3.08. 

“Performing Note Deficiency” means any time that less than 65% of the then aggregate outstanding principal amount of
all Equipment Notes (other than any Additional Equipment Notes issued under any Indenture) are Performing Equipment Notes. 

“Prospectus Supplement” means the final Prospectus Supplement dated the date specified in item 5 on Schedule A
relating to the Certificates, as such Prospectus Supplement may be amended or supplemented. 
 “Provider Advance”
means a Downgrade Advance or a Non-Extension Advance. 
 “Rate Determination
Notice” has the meaning assigned to such term in Section 3.07(g). 
 “Regulatory Change” has the
meaning assigned to such term in Section 3.01. 
 “Replenishment Amount” has the meaning assigned to such term
in Section 2.06(b). 
 “Required Amount” means, for any day, the sum of the aggregate amount of interest,
calculated at the rate per annum equal to the Stated Interest Rate for the Class B Certificates, that would be payable on the Class B Certificates on each of the three successive semi-annual Regular Distribution Dates immediately following
such day or, if such day is a Regular Distribution Date, on such day and the succeeding two semi-annual Regular Distribution Dates, in each case calculated on the basis of the Pool Balance of the Class B Certificates on such day and without
regard to expected future distributions of principal on the Class B Certificates. 
 “Special Termination
Advance” means an Advance made pursuant to Section 2.02(g). 

  
 6 

 [Revolving Credit Agreement (2018-1B)] 

 

 “Special Termination Notice” means the Notice of Termination
substantially in the form of Annex VIII to this Agreement. 
 “Successor Trust” means United Airlines Pass Through
Trust 2018-1B-S. 
 “Termination
Date” means the earliest to occur of the following: (i) the Expiry Date; (ii) the date on which the Borrower delivers to the Liquidity Provider a certificate, signed by a Responsible Officer of the Borrower, certifying that
all of the Class B Certificates have been paid in full (or provision has been made for such payment in accordance with the Intercreditor Agreement and the Class B Trust Agreement) or are otherwise no longer entitled to the benefits of this
Agreement; (iii) the date on which the Borrower delivers to the Liquidity Provider a certificate, signed by a Responsible Officer of the Borrower, certifying that a Replacement Liquidity Facility has been substituted for this Agreement in full
pursuant to Section 3.5(e) of the Intercreditor Agreement; (iv) the fifth Business Day following the receipt by the Borrower of a Termination Notice or Special Termination Notice from the Liquidity Provider pursuant to Section 6.01 or
6.02 hereof, respectively; and (v) the date on which no Advance is or may (including by reason of reinstatement as herein provided) become available for a Borrowing hereunder. 

“Termination Notice” means the Notice of Termination substantially in the form of Annex V to this Agreement. 

“Transferee” has the meaning assigned to such term in Section 7.08(b). 

“Unapplied Downgrade Advance” means any Downgrade Advance other than an Applied Downgrade Advance. 

“Unapplied Non-Extension Advance” means any
Non-Extension Advance other than an Applied Non-Extension Advance. 

“Unapplied Provider Advance” means any Provider Advance other than an Applied Provider Advance. 

“Unapplied Special Termination Advance” means any Special Termination Advance other than an Applied Special
Termination Advance. 
 “Unpaid Advance” has the meaning assigned to such term in Section 2.05. 

(b) Terms Defined in the Intercreditor Agreement. For all purposes of this Agreement, the following terms shall have the respective meanings
assigned to such terms in the Intercreditor Agreement: 
 “Acceleration”, “Additional
Certificates”, “Additional Equipment Notes”, “Aircraft”, “Bankruptcy Code”, “Certificate”, “Class”,
“Class A Certificates”, “Class AA Certificates”, “Class B Cash Collateral
Account”, “Class B Certificates”, “Class B Trust”, “Class B Trust
Agreement”, “Class B Trustee”, “Class B Closing Date”, “Class B
Underwriters”, “Class B Underwriting Agreement”, “Controlling Party”, “Corporate Trust Office”,
“Delivery Period Expiry Date”, “Downgraded  

  
 7 

 [Revolving Credit Agreement (2018-1B)] 

 

 
Facility”, “Downgrade Event”, “Equipment Notes”, “Fee Letter”, “Final Legal Distribution
Date”, “Financing Agreement”, “Investment Earnings”, “Liquidity Facility”, “Liquidity Obligations”, “Loan Trustee”,
“Non-Extended Facility”, “Note Purchase Agreement”, “Operative Agreements”, “Participation Agreement”,
“Performing Equipment Note”, “Person”, “Pool Balance”, “Rating Agencies”, “Regular Distribution Date”, “Replacement
Liquidity Facility”, “Responsible Officer”, “Scheduled Payment”, “Series B Equipment Notes”, “Special Payment”, “Stated Interest
Rate”, “Subordination Agent”, “Taxes”, “Threshold Rating”, “Transfer”, “Trust Agreement”,
“Trustee”, “Underwriters”, “Underwriting Agreement”, “United”, and “United Bankruptcy Event”. 

ARTICLE II 
 AMOUNT
AND TERMS OF THE COMMITMENT 
 Section 2.01 The Advances. The Liquidity Provider hereby irrevocably agrees, on the terms and
conditions hereinafter set forth, to make Advances to the Borrower from time to time on any Business Day during the period from the Effective Date until 1:00 p.m. (New York City time) on the Expiry Date (unless the obligations of the Liquidity
Provider shall be earlier terminated in accordance with the terms of Section 2.04(b)) in an aggregate amount at any time outstanding not to exceed the Maximum Commitment. 

Section 2.02 Making the Advances. (a) Interest Advances shall be made in one or more Borrowings by delivery to the Liquidity
Provider of one or more written and completed Notices of Borrowing in substantially the form of Annex I attached hereto, signed by a Responsible Officer of the Borrower, in an amount not exceeding the Maximum Available Commitment at such time
and shall be used solely for the payment when due of interest on the Class B Certificates at the Stated Interest Rate therefor in accordance with Section 3.5(a) of the Intercreditor Agreement. Each Interest Advance made hereunder shall
automatically reduce the Maximum Available Commitment and the amount available to be borrowed hereunder by subsequent Advances by the amount of such Interest Advance (subject to reinstatement as provided in the next sentence). Upon repayment to the
Liquidity Provider in full or in part of the amount of any Interest Advance made pursuant to this Section 2.02(a), together with accrued interest thereon (as provided herein), the Maximum Available Commitment shall be reinstated by the amount
of such repaid Interest Advance but not to exceed the Maximum Commitment; provided, however, that, subject to Section 2.06(d), the Maximum Available Commitment shall not be so reinstated at any time if (x) (i) a Liquidity
Event of Default shall have occurred and be continuing and (ii) there is a Performing Note Deficiency or (y) a Final Advance, a Special Termination Advance, a Downgrade Advance or a Non-Extension
Advance shall have been made or an Interest Advance shall have been converted into a Final Advance. 
 (b) A
Non-Extension Advance shall be made in a single Borrowing if this Agreement is not extended in accordance with Section 3.5(d) of the Intercreditor Agreement (unless a Replacement Liquidity Facility to
replace this Agreement shall have been delivered to the Borrower as contemplated by said Section 3.5(d) within the time period specified in such Section) by delivery to the Liquidity Provider of a written and completed Notice of Borrowing in
substantially the form of Annex II attached hereto, signed by a Responsible Officer of the Borrower, in an amount equal to the Maximum Available Commitment at such time, and shall be used to fund the Class B Cash Collateral Account in
accordance with said Section 3.5(d) and Section 3.5(f) of the Intercreditor Agreement. 

  
 8 

 [Revolving Credit Agreement (2018-1B)] 

 

 (c) A Downgrade Advance shall be made in a single Borrowing upon the occurrence of a
Downgrade Event (as provided for in Section 3.5(c) of the Intercreditor Agreement), unless (i) a Replacement Liquidity Facility to replace this Agreement shall have been previously delivered to the Borrower within thirty-five
(35) days after the Downgrade Event or (ii) the relevant Rating Agency shall have provided confirmation within thirty (30) days after the Downgrade Event that such Downgrade Event will not result in a downgrading, withdrawal or
suspension by such Rating Agency of the rating then in effect for the related Class of Certificates, in each case of clause (i) and (ii), in accordance with said Section 3.5(c), by delivery to the Liquidity Provider of a written and
completed Notice of Borrowing in substantially the form of Annex III attached hereto, signed by a Responsible Officer of the Borrower, in an amount equal to the Maximum Available Commitment at such time, and shall be used to fund the
Class B Cash Collateral Account in accordance with said Section 3.5(c) and Section 3.5(f) of the Intercreditor Agreement. Upon the occurrence of a Downgrade Event, the Liquidity Provider shall promptly deliver notice thereof to the
Borrower, the Class B Trustee and United. 
 (d) A Final Advance shall be made in a single Borrowing upon the receipt by the Borrower of
a Termination Notice from the Liquidity Provider pursuant to Section 6.01 hereof by delivery to the Liquidity Provider of a written and completed Notice of Borrowing in substantially the form of Annex IV attached hereto, signed by a
Responsible Officer of the Borrower, in an amount equal to the Maximum Available Commitment at such time, and shall be used to fund the Class B Cash Collateral Account (in accordance with Sections 3.5(f) and 3.5(i) of the Intercreditor
Agreement). 
 (e) Each Borrowing shall be made on notice in writing (a “Notice of Borrowing”) in substantially the
form required by Section 2.02(a), 2.02(b), 2.02(c), 2.02(d) or 2.02(g), as the case may be, given by the Borrower to the Liquidity Provider. If a Notice of Borrowing is delivered by the Borrower in respect of any Borrowing no later than
1:00 p.m. (New York City time) on a Business Day, upon satisfaction of the conditions precedent set forth in Section 4.02 with respect to a requested Borrowing, the Liquidity Provider shall make available to the Borrower, in accordance
with its payment instructions, the amount of such Borrowing in U.S. dollars and immediately available funds, before 4:00 p.m. (New York City time) on such Business Day. If a Notice of Borrowing is delivered by the Borrower in respect of any
Borrowing on a day that is not a Business Day or after 1:00 p.m. (New York City time) on a Business Day, upon satisfaction of the conditions precedent set forth in Section 4.02 with respect to a requested Borrowing, the Liquidity Provider
shall make available to the Borrower, in accordance with its payment instructions, the amount of such Borrowing in U.S. dollars and in immediately available funds, before 12:00 Noon (New York City time) on the first Business Day next following the
day of receipt of such Notice of Borrowing. Payments of proceeds of a Borrowing shall be made by wire transfer of immediately available funds to the Borrower in accordance with such wire transfer instructions as the Borrower shall furnish from time
to time to the Liquidity Provider for such purpose. Each Notice of Borrowing shall be irrevocable and binding on the Borrower. Each Notice of Borrowing shall be effective upon receipt of a copy thereof by the Liquidity Provider at the address
specified pursuant to Section 7.02. 

  
 9 

 [Revolving Credit Agreement (2018-1B)] 

 

 (f) Upon the making of any Advance requested pursuant to a Notice of Borrowing, in accordance
with the Borrower’s payment instructions, the Liquidity Provider shall be fully discharged of its obligation hereunder with respect to such Notice of Borrowing, and the Liquidity Provider shall not thereafter be obligated to make any further
Advances hereunder in respect of such Notice of Borrowing to the Borrower or to any other Person. If the Liquidity Provider makes an Advance requested pursuant to a Notice of Borrowing before 12:00 Noon (New York City time) on the second Business
Day after the date of payment specified in Section 2.02(e), the Liquidity Provider shall have fully discharged its obligations hereunder with respect to such Advance and an event of default shall not have occurred hereunder. Following the
making of any Advance pursuant to Section 2.02(b), (c), (d) or (g) hereof to fund the Class B Cash Collateral Account, the Liquidity Provider shall have no interest in or rights to the Class B Cash Collateral Account, the
funds constituting such Advance or any other amounts from time to time on deposit in the Class B Cash Collateral Account; provided that the foregoing shall not affect or impair the obligations of the Subordination Agent to make the
distributions contemplated by Section 3.5(e) or (f) of the Intercreditor Agreement, and provided, further, that the foregoing shall not affect or impair the rights of the Liquidity Provider to provide written instructions with
respect to the investment and reinvestment of amounts in the Class B Cash Collateral Account to the extent provided in Section 2.2(b) of the Intercreditor Agreement. By paying to the Borrower proceeds of Advances requested by the Borrower
in accordance with the provisions of this Agreement, the Liquidity Provider makes no representation as to, and assumes no responsibility for, the correctness or sufficiency for any purpose of the amount of the Advances so made and requested. 

(g) A Special Termination Advance shall be made in a single Borrowing upon the receipt by the Borrower of a Special Termination Notice from the
Liquidity Provider pursuant to Section 6.02, by delivery to the Liquidity Provider of a written and completed Notice of Borrowing in substantially the form of Annex VII, signed by a Responsible Officer of the Borrower, in an amount equal to the
Maximum Available Commitment at such time, and shall be used to fund the Class B Cash Collateral Account (in accordance with Section 3.5(f) and Section 3.5(m) of the Intercreditor Agreement). 

Section 2.03 Fees. The Borrower agrees to pay to the Liquidity Provider the fees set forth in the Fee Letter applicable to this
Agreement. 
 Section 2.04 Reductions or Termination of the Maximum Commitment. 

(a) Automatic Reduction. Promptly following each date on which the Required Amount is reduced as a result of a reduction in the Pool
Balance of the Class B Certificates or otherwise, the Maximum Commitment shall automatically be reduced to an amount equal to such Required Amount (as calculated by the Borrower); provided that on (or, as applicable, immediately following) the
second Regular Distribution Date, the Maximum Commitment shall automatically be reduced to the then Required Amount. The Borrower shall give notice of any such automatic reduction of the Maximum Commitment to the Liquidity Provider within two
Business Days thereof. The failure by the Borrower to furnish any such notice shall not affect such automatic reduction of the Maximum Commitment. 

  
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 (b) Termination. Upon the making of any Provider Advance or Special Termination
Advance or the making of or conversion to a Final Advance hereunder or the occurrence of the Termination Date, the obligation of the Liquidity Provider to make further Advances hereunder shall automatically and irrevocably terminate, and the
Borrower shall not be entitled to request any further Borrowing hereunder, except in the case of a Downgrade Advance, as provided in Section 2.06(d). 

Section 2.05 Repayments of Interest Advances, the Special Termination Advance or the Final Advance. Subject to Sections 2.06,
2.07 and 2.09 hereof, the Borrower hereby agrees, without notice of an Advance or demand for repayment from the Liquidity Provider (which notice and demand are hereby waived by the Borrower), to pay, or to cause to be paid, to the Liquidity Provider
on each date on which the Liquidity Provider shall make an Interest Advance, the Special Termination Advance or the Final Advance, an amount equal to (a) the amount of such Advance (any such Advance, until repaid, is referred to herein as an
“Unpaid Advance”) (if multiple Interest Advances are outstanding any such repayment to be applied in the order in which such Interest Advances have been made, starting with the earliest), plus (b) interest on the amount
of each such Unpaid Advance as provided in Section 3.07 hereof; provided that if (i) the Liquidity Provider shall make a Provider Advance at any time after making one or more Interest Advances which shall not have been repaid in
accordance with this Section 2.05 or (ii) this Liquidity Facility shall become a Downgraded Facility or Non-Extended Facility at any time when unreimbursed Interest Advances have reduced the Maximum
Available Commitment to zero, then such Interest Advances shall cease to constitute Unpaid Advances and shall be deemed to have been changed into an Applied Downgrade Advance or an Applied Non-Extension
Advance, as the case may be, for all purposes of this Agreement (including, without limitation, for the purpose of determining when such Interest Advance is required to be repaid to the Liquidity Provider in accordance with Section 2.06 and for
the purposes of Section 2.06(b)); provided, further, that amounts in respect of a Special Termination Advance withdrawn from the Class B Cash Collateral Account for the purpose of paying interest on the Class B
Certificates in accordance with Section 3.5(f) of the Intercreditor Agreement (the amount of any such withdrawal being an “Applied Special Termination Advance”) shall thereafter (subject to Section 2.06(b)) be
treated as an Interest Advance under this Agreement for purposes of determining the Applicable Liquidity Rate for interest payable thereon; provided, further, that if, following the making of a Special Termination Advance, the
Liquidity Provider delivers a Termination Notice to the Borrower pursuant to Section 6.01, such Special Termination Advance shall thereafter be converted to and treated as a Final Advance under this Agreement for purposes of determining the
Applicable Liquidity Rate for interest payable thereon and the obligation for repayment thereof and treated as an Applied Special Termination Advance for purposes of Section 2.6(c) of the Intercreditor Agreement, and, provided,
further, that if, after making a Provider Advance, the Liquidity Provider delivers a Special Termination Notice to the Borrower pursuant to Section 6.02, any Unapplied Provider Advance shall be converted to and treated as a Special
Termination Advance under this Agreement for purposes of determining the Applicable Liquidity Rate for interest payable thereon and the obligation for repayment thereof under the Intercreditor Agreement. The Borrower and the Liquidity Provider agree
that the repayment in full of each Interest Advance, the Special Termination Advance and Final Advance on the date such Advance is made is intended to be a contemporaneous exchange for new value given to the Borrower by the Liquidity Provider. 

  
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 Section 2.06 Repayments of Provider Advances. (a) Amounts advanced hereunder
in respect of a Provider Advance shall be deposited in the Class B Cash Collateral Account, invested and withdrawn from the Class B Cash Collateral Account as set forth in Sections 3.5(c), (d), (e) and (f) of the Intercreditor
Agreement. Subject to Sections 2.07 and 2.09, the Borrower agrees to pay to the Liquidity Provider, on each Regular Distribution Date, commencing on the first Regular Distribution Date after the making of a Provider Advance, interest on the
principal amount of any such Provider Advance as provided in Section 3.07; provided, however, that amounts in respect of a Provider Advance withdrawn from the Class B Cash Collateral Account for the purpose of paying interest
on the Class B Certificates in accordance with Section 3.5(f) of the Intercreditor Agreement (the amount of any such withdrawal being (y) in the case of a Downgrade Advance, an “Applied Downgrade Advance” and
(z) in the case of a Non-Extension Advance, an “Applied Non-Extension Advance” and, together with an Applied Downgrade Advance, an “Applied Provider
Advance”) shall thereafter (subject to Section 2.06(b)) be treated as an Interest Advance under this Agreement for purposes of determining the Applicable Liquidity Rate for interest payable thereon and the dates on which such
interest is payable; provided, further, however, that if, following the making of a Provider Advance, the Liquidity Provider delivers a Termination Notice to the Borrower pursuant to Section 6.01 hereof, such Provider Advance
shall thereafter be converted to and treated as a Final Advance under this Agreement for purposes of determining the Applicable Liquidity Rate for interest payable thereon and the obligation for repayment thereof and treated as an Applied Downgrade
Advance or Applied Non-Extension Advance, as the case may be, for the purposes of Section 2.6(c) of the Intercreditor Agreement. Subject to Sections 2.07 and 2.09 hereof, immediately upon the
withdrawal of any amounts from the Class B Cash Collateral Account on account of a reduction in the Required Amount, the Borrower shall repay to the Liquidity Provider a portion of the Provider Advances in a principal amount equal to the amount
of such reduction, plus interest on the principal amount prepaid as provided in Section 3.07 hereof. 
 (b) At any time when an Applied
Provider Advance or an Applied Special Termination Advance (or any portion thereof) is outstanding, upon the deposit in the Class B Cash Collateral Account of any amount pursuant to clause “fourth” of Section 3.2 of the
Intercreditor Agreement (any such amount being a “Replenishment Amount”) for the purpose of replenishing or increasing the balance thereof up to the amount of the Required Amount at such time, (i) the aggregate
outstanding principal amount of all Applied Provider Advances or the Applied Special Termination Advance (and of Provider Advances treated as an Interest Advance for purposes of determining the Applicable Liquidity Rate for interest payable thereon)
shall be automatically reduced by the amount of such Replenishment Amount (if multiple Applied Provider Advances are outstanding, such Replenishment Amount to be applied in the order in which such Applied Provider Advances have been made, starting
with the earliest) and (ii) the aggregate outstanding principal amount of all Unapplied Provider Advances or of the Unapplied Special Termination Advance shall be automatically increased by the amount of such Replenishment Amount. 

(c) Upon the provision of a Replacement Liquidity Facility in replacement of this Agreement in accordance with Section 3.5(e) of the
Intercreditor Agreement, amounts remaining on deposit in the Class B Cash Collateral Account after giving effect to any Applied Provider Advance or Applied Special Termination Advance on the date of such replacement shall be reimbursed to the
replaced Liquidity Provider, but only to the extent such amounts are necessary to repay in full to the replaced Liquidity Provider all amounts owing to it hereunder. 

  
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 (d) If, at any time after making a Downgrade Advance, the Liquidity Provider satisfies the
Threshold Rating and delivers a written notice to that effect to the Borrower and United, as of the second Business Day following receipt of such notice, (i) the Unapplied Downgrade Advance shall be withdrawn from the Class B Cash
Collateral Account and reimbursed to the Liquidity Provider, (ii) the Maximum Commitment shall be reinstated by an amount equal to the amount of such Unapplied Downgrade Advance so reimbursed, but not to exceed the Maximum Commitment and the
obligation of the Liquidity Provider to make Advances shall be reinstated in an equal amount, and (iii) the proviso in the definition of Maximum Available Commitment shall no longer apply to such Downgrade Advance. 

Section 2.07 Payments to the Liquidity Provider Under the Intercreditor Agreement. In order to provide for payment or repayment to
the Liquidity Provider of any amounts hereunder, the Intercreditor Agreement provides that amounts available and referred to in Articles II and III of the Intercreditor Agreement, to the extent payable to the Liquidity Provider pursuant to
the terms of the Intercreditor Agreement (including, without limitation, Section 3.5(f) of the Intercreditor Agreement), shall be paid to the Liquidity Provider in accordance with the terms thereof. Amounts so paid to, and not required to be
returned by, the Liquidity Provider shall be applied by the Liquidity Provider to Liquidity Obligations then due and payable in accordance with the Intercreditor Agreement and shall discharge in full the corresponding obligations of the Borrower
hereunder (or, if not provided for in the Intercreditor Agreement, then in such manner as the Liquidity Provider shall deem appropriate). 

Section 2.08 Book Entries. The Liquidity Provider shall maintain in accordance with its usual practice an account or accounts
evidencing the indebtedness of the Borrower resulting from Advances made from time to time and the amounts of principal and interest payable hereunder and paid from time to time in respect thereof; provided, however, that the failure
by the Liquidity Provider to maintain such account or accounts shall not affect the obligations of the Borrower in respect of Advances. 

Section 2.09 Payments from Available Funds Only. All payments to be made by the Borrower under this Agreement, including, without
limitation, Sections 7.05 and 7.07, shall be made only from the amounts that constitute Scheduled Payments, Special Payments or payments under Section 8.1 of the Participation Agreements and payments under the Fee Letter applicable to this
Agreement and Section 6 of the Note Purchase Agreement and only to the extent that the Borrower shall have sufficient income or proceeds therefrom to enable the Borrower to make payments in accordance with the terms hereof after giving effect
to the priority of payments provisions set forth in the Intercreditor Agreement. The Liquidity Provider agrees that it will look solely to such amounts in respect of payments to be made by the Borrower hereunder to the extent available for
distribution to it as provided in the Intercreditor Agreement and this Agreement and that the Borrower, in its individual capacity, is not personally liable to it for any amounts payable or liability under this Agreement except as expressly provided
in this Agreement, the Intercreditor Agreement or any Participation Agreement. Amounts on deposit in the Class B Cash Collateral Account shall be available to the Borrower to make payments under this Agreement only to the extent and for the
purposes expressly contemplated in Section 3.5(f) of the Intercreditor Agreement. 

  
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 Section 2.10 Non-Extension of the Expiry
Date; Non-Extension Advance. If in any calendar year the Liquidity Provider advises the Borrower before the 25th day prior to the anniversary date of
the Class B Closing Date in such calendar year (such 25th day, the “Notice Date”) that the Expiry Date shall not be extended beyond such anniversary date (and if this
Agreement shall not have been replaced in accordance with Section 3.5(e) of the Intercreditor Agreement), the Borrower shall be entitled on and after such Notice Date (but prior to the then effective Expiry Date) to request a Non-Extension Advance in accordance with Section 2.02(b) hereof and Section 3.5(d) of the Intercreditor Agreement; provided, however, that if in any calendar year the Liquidity Provider does
not so advise the Borrower before the Notice Date in such calendar year, the Expiry Date shall be automatically extended to the anniversary date of the Class B Closing Date in the next calendar year. 

ARTICLE III 

OBLIGATIONS OF THE BORROWER 

Section 3.01 Increased Costs. The Borrower shall pay to the Liquidity Provider from time to time such amounts as may be necessary
to compensate the Liquidity Provider for any increased costs incurred by the Liquidity Provider which are attributable to its making or maintaining any Advances hereunder or its obligation to make any such Advances hereunder, or any reduction in any
amount receivable by the Liquidity Provider under this Agreement or the Intercreditor Agreement in respect of any such Advances or such obligation (such increases in costs and reductions in amounts receivable being herein called
“Additional Costs”), resulting from any change after the date of this Agreement in U.S. federal, state, municipal, or foreign laws or regulations (including Regulation D of the Board of Governors of the Federal Reserve
System), or the adoption or making after the date of this Agreement of any interpretations, directives, or requirements applying to a class of banks including the Liquidity Provider under any U.S. federal, state, municipal, or any foreign laws or
regulations (whether or not having the force of law) by any court, central bank or monetary authority charged with the interpretation or administration thereof (a “Regulatory Change”), which: (1) changes the basis of
taxation of any amounts payable to the Liquidity Provider under this Agreement in respect of any such Advances or such obligation (other than Excluded Taxes); or (2) imposes or modifies any reserve, special deposit, compulsory loan or similar
requirements relating to any extensions of credit or other assets of, or any deposits with other liabilities of, the Liquidity Provider (including any such Advances or such obligation or any deposits referred to in the definition of LIBOR Rate or
related definitions). For the avoidance of doubt, any Regulatory Changes based on the consultative papers of The Basel Committee on Banking Supervision of December 2009 entitled “Strengthening the resilience of the banking sector” and
“International framework for liquidity risk measurement, standards and monitoring”, in each case together with any amendments thereto (collectively, “Basel III”), will not be treated, for purposes of determining
whether the Liquidity Provider is entitled to compensation under this Section 3.01, as having been adopted or having come into effect before the date hereof, and any such Regulatory Changes based on Basel III shall be determined to be adopted
only when the national banking supervisory authorities, or other relevant administrative or legislative bodies having primary 

  
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jurisdiction or regulatory authority over the Liquidity Provider, adopt any such Regulatory Changes based on Basel III in the primary jurisdiction of the Liquidity Provider. The Liquidity
Provider agrees to use reasonable efforts (consistent with applicable legal and regulatory restrictions) to change the jurisdiction of its Facility Office if making such change would avoid the need for, or reduce the amount of, any amount payable
under this Section that may thereafter accrue and would not, in the reasonable judgment of the Liquidity Provider, be otherwise disadvantageous to the Liquidity Provider. 

The Liquidity Provider will notify the Borrower of any event occurring after the date of this Agreement that will entitle the Liquidity
Provider to compensation pursuant to this Section 3.01 as promptly as practicable after it obtains knowledge thereof and determines to request such compensation, which notice shall describe in reasonable detail the calculation of the amounts
owed under this Section. Determinations by the Liquidity Provider for purposes of this Section 3.01 of the effect of any Regulatory Change on its costs of making or maintaining Advances or on amounts receivable by it in respect of Advances, and
of the additional amounts required to compensate the Liquidity Provider in respect of any Additional Costs, shall be prima facie evidence of the amount owed under this Section. 

Notwithstanding the preceding two paragraphs, the Liquidity Provider and the Subordination Agent agree that any permitted assignee or
participant of the initial Liquidity Provider which is not a bank shall not be entitled to the benefits of the preceding two paragraphs (but without limiting the provisions of Section 7.08 hereof). 

Section 3.02 Capital Adequacy and Liquidity Coverage. If (1) the adoption, after the date hereof, of any applicable
governmental law, rule or regulation regarding capital adequacy or liquidity coverage, (2) any change, after the date hereof, in the interpretation or administration of any such law, rule or regulation by any central bank or other governmental
authority charged with the interpretation or administration thereof or (3) compliance by the Liquidity Provider or any corporation or bank controlling the Liquidity Provider with any applicable guideline or request of general applicability,
issued after the date hereof, by any central bank or other governmental authority (whether or not having the force of law) that constitutes a change of the nature described in clause (2), has the effect of (x) requiring an increase in the
amount of capital or liquid assets required to be maintained by the Liquidity Provider or any corporation or bank controlling the Liquidity Provider, or (y) reducing the rate of return on assets or capital of the Liquidity Provider (or such
corporation or bank) and such adoption, change or compliance, as the case may be, relates to a category of claims or assets that includes the Liquidity Provider’s obligations hereunder (including funded obligations) and other similar
obligations, the Borrower shall, subject to the provisions of the next paragraph, pay to the Liquidity Provider from time to time such additional amount or amounts as are necessary to compensate the Liquidity Provider for such portion of such
increase or reduction as shall be reasonably allocable to the Liquidity Provider’s obligations to the Borrower hereunder. For the avoidance of doubt, the adoption of any law, rule or regulation described in clause (1) of the first sentence
of this Section 3.02, and the taking of any action described in clauses (2) and (3) of such sentence, that in each case is based on Basel III, will not be treated, for purposes of determining whether the Liquidity Provider (or any
corporation or bank controlling the Liquidity Provider) is entitled to compensation under this Section 3.02, as having been adopted, come into effect, been issued or been taken before the date hereof, and any such law, rule or regulation and
any of the actions 

  
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described in clauses (2) and (3) of such sentence that is based on Basel III shall be determined to have been adopted, come into effect, been issued or been taken only when the central bank
or other legislative or administrative governmental authorities in the primary jurisdiction of the Liquidity Provider (or any corporation or bank controlling the Liquidity Provider) adopt any such law, rule or regulation or take any such actions.
The Liquidity Provider agrees to use reasonable efforts (consistent with applicable legal and regulatory restrictions) to change the jurisdiction of its Facility Office if making such change would avoid the need for, or reduce the amount of, any
amount payable under this Section that may thereafter accrue and would not, in the reasonable judgment of the Liquidity Provider, be otherwise materially disadvantageous to the Liquidity Provider. 

The Liquidity Provider will notify the Borrower of any event occurring after the date of this Agreement that will entitle the Liquidity
Provider to compensation pursuant to this Section 3.02 as promptly as practicable after it obtains knowledge thereof and determines to request such compensation, which notice shall describe in reasonable detail the calculation of the amounts
owed under this Section. Determinations by the Liquidity Provider for purposes of this Section 3.02 of the effect of any increase in the amount of capital or liquid assets required to be maintained by the Liquidity Provider and of the amount
allocable to the Liquidity Provider’s obligations to the Borrower hereunder shall be conclusive evidence of the amounts owed under this Section, absent manifest error. 

Notwithstanding the preceding two paragraphs, the Liquidity Provider and the Subordination Agent agree that any permitted assignee or
participant of the initial Liquidity Provider which is not a bank shall not be entitled to the benefits of the preceding two paragraphs (but without limiting the provisions of Section 7.08 hereof). 

Section 3.03 Payments Free of Deductions. (a) Unless required by applicable law, all payments made by the Borrower under this
Agreement shall be made free and clear of, and without reduction for or on account of, any present or future stamp or other taxes, levies, imposts, duties, charges, fees, deductions, withholdings, restrictions or conditions of any nature whatsoever
now or hereafter imposed on, levied, collected, withheld or assessed, excluding Excluded Taxes (such non-excluded taxes being referred to herein, collectively, as
“Non-Excluded Taxes” and each, individually, as a “Non-Excluded Tax”). If any
Non-Excluded Taxes are required to be withheld from any amounts payable to the Liquidity Provider under this Agreement, (i) the Borrower shall within the time prescribed therefor by applicable law pay to
the appropriate governmental or taxing authority the full amount of any such Non-Excluded Taxes (and any additional Non-Excluded Taxes in respect of the additional
amounts payable under clause (ii) hereof) and make such reports or returns in connection therewith at the time or times and in the manner prescribed by applicable law, and (ii) the amounts so payable to the Liquidity Provider shall be
increased to the extent necessary to yield to the Liquidity Provider (after payment of all Non-Excluded Taxes) interest or any other such amounts payable under this Agreement at the rates or in the amounts
specified in this Agreement. The Liquidity Provider agrees to use reasonable efforts (consistent with its internal policy and legal and regulatory restrictions) to change the jurisdiction of its Facility Office if making such change would avoid the
need for, or reduce the amount of, any such additional amounts that may thereafter accrue and would not, in the reasonable judgment of the Liquidity Provider, be otherwise disadvantageous to the Liquidity Provider. From time to time upon the
reasonable request of the 

  
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Borrower, the Liquidity Provider agrees to provide to the Borrower two original Internal Revenue Service
Forms W-8BEN-E, W-8ECI or W-9, as appropriate, or any successor or other form
prescribed by the Internal Revenue Service, certifying that the Liquidity Provider is exempt from or entitled to a reduced rate of United States withholding tax on payments pursuant to this Agreement. Within 30 days after the date of each payment
hereunder, the Borrower shall furnish to the Liquidity Provider the original or a certified copy of (or other documentary evidence of) the payment of the Non-Excluded Taxes applicable to such payment. 

(b) Unless required by applicable law, all payments (including, without limitation, Advances) made by the Liquidity Provider under this
Agreement shall be made free and clear of, and without reduction for or on account of, any Taxes. If any Taxes are required to be withheld or deducted from any amounts payable to the Borrower under this Agreement, the Liquidity Provider shall
(i) within the time prescribed therefor by applicable law pay to the appropriate governmental or taxing authority the full amount of any such Taxes (and any additional Taxes in respect of the additional amounts payable under clause (ii)
hereof) and make such reports or returns in connection therewith at the time or times and in the manner prescribed by applicable law, and (ii) pay to the Borrower an additional amount which (after deduction of all such Taxes) will be sufficient
to yield to the Borrower the full amount which would have been received by it had no such withholding or deduction been made. Within 30 days after the date of each payment hereunder, the Liquidity Provider shall furnish to the Borrower the original
or a certified copy of (or other documentary evidence of) the payment of the Taxes applicable to such payment. 
 (c) On or before the
Closing Date, the Borrower shall provide the Liquidity Provider with a fully executed Internal Revenue Service Form W-9, showing a complete exemption from U.S federal backup withholding tax. If any other
exemption from, or reduction in the rate of, any Taxes required to be borne by the Liquidity Provider under Section 3.03(b) is reasonably available to the Borrower without providing any information regarding the holders or beneficial owners of
the Certificates, the Borrower shall deliver the Liquidity Provider such form or forms and such other evidence of the eligibility of the Borrower for such exemption or reductions (but without any requirement to provide any information regarding the
holders or beneficial owners of the Certificates) as the Liquidity Provider may reasonably identify to the Borrower as being required as a condition to exemption from, or reduction in the rate of, such Taxes. 

(d) If a payment made to the Liquidity Provider or Borrower hereunder would be subject to U.S. federal withholding Tax imposed by FATCA if the
Borrower or Liquidity Provider, as applicable, were to fail to comply with the applicable reporting requirements of FATCA (including those contained in Section 1471 (b) or 1472 (b) of the U.S. Internal Revenue Code, as applicable), it shall
deliver to the Borrower or the Liquidity Provider, as applicable, at the time or times prescribed by law and at such time or times reasonably requested by the Borrower or Liquidity Provider, as applicable, such documentation prescribed by applicable
law (including as prescribed by Section 1471 (b)(3)(C)(i) of the U.S. Internal Revenue Code) and such additional documentation reasonably requested by the Borrower or Liquidity Provider, as applicable, as may be necessary for the Borrower or
Liquidity Provider, as applicable, to comply with its obligations under FATCA and to determine that the Liquidity Provider or Borrower has complied with the Liquidity Provider’s or Borrower’s obligations under FATCA or to determine the
amount to deduct and withhold from such payment. Solely for purposes of this paragraph, “FATCA” shall include any amendments made to FATCA after the date of this Agreement. 

  
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 Section 3.04 Payments. The Borrower shall make or cause to be made each payment
to the Liquidity Provider under this Agreement so as to cause the same to be received by the Liquidity Provider not later than 1:00 P.M. (New York City time) on the day when due. The Borrower shall make all such payments in lawful money of the
United States of America, to the Liquidity Provider in immediately available funds, by wire transfer to the account specified for the Liquidity Provider in Schedule B or to such other U.S. bank account as the Liquidity Provider may from time to time
direct the Borrower in writing. 
 Section 3.05 Computations. All computations of interest based on the Base Rate shall be made
on the basis of a year of 365 or 366 days, as the case may be, and all computations of interest based on the LIBOR Rate shall be made on the basis of a year of 360 days, in each case for the actual number of days (including the first day but
excluding the last day) occurring in the period for which such interest is payable. 
 Section 3.06 Payment on Non-Business Days. Whenever any payment to be made hereunder to the Liquidity Provider shall be stated to be due on a day other than a Business Day, such payment shall be made on the next succeeding Business Day
and no additional interest shall be due as a result. If any payment in respect of interest on an Advance is so deferred to the next succeeding Business Day, such deferral shall not delay the commencement of the next Interest Period for such Advance
(if such Advance is a LIBOR Advance) or reduce the number of days for which interest will be payable on such Advance on the next interest payment date for such Advance. 

Section 3.07 Interest. (a) Subject to Section 2.09, the Borrower shall pay, or shall cause to be paid, without
duplication, interest on (i) the unpaid principal amount of each Advance from and including the date of such Advance (or, in the case of an Applied Provider Advance or Applied Special Termination Advance, from and including the date on which
the amount thereof was withdrawn from the Class B Cash Collateral Account to pay interest on the Class B Certificates) to but excluding the date such principal amount shall be paid in full (or, in the case of an Applied Provider Advance or
Applied Special Termination Advance, the date on which the Class B Cash Collateral Account is fully replenished in respect of such Advance) and (ii) any other amount due hereunder (whether fees, commissions, expenses or other amounts or,
to the extent permitted by law, installments of interest on Advances or any such other amount) which is not paid when due (whether at stated maturity, by acceleration or otherwise) from and including the due date thereof to but excluding the date
such amount is paid in full, in each such case, at a fluctuating interest rate per annum for each day equal to the Applicable Liquidity Rate (as defined below) for such Advance or such other amount, as the case may be, as in effect for such day, but
in no event at a rate per annum greater than the maximum rate permitted by applicable law; provided, however, that, if at any time the otherwise applicable interest rate as set forth in this Section 3.07 shall exceed the maximum
rate permitted by applicable law, then any subsequent reduction in such interest rate will not reduce the rate of interest payable pursuant to this Section 3.07 below the maximum rate permitted by applicable law until the total amount of
interest accrued equals the amount of interest that would have accrued if such otherwise applicable interest rate as set forth in this Section 3.07 had at all times been in effect. 

  
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 (b) Except as provided in clause (e) below, each Advance will be either a Base Rate
Advance or a LIBOR Advance as provided in this Section. Each such Advance will be a Base Rate Advance for the period from the date of its Borrowing to (but excluding) the third LIBOR Business Day following the Liquidity Provider’s receipt of
the Notice of Borrowing for such Advance. Thereafter, such Advance shall be a LIBOR Advance. 
 (c) Each LIBOR Advance shall bear interest
during each Interest Period at a rate per annum equal to the LIBOR Rate for such Interest Period plus the Applicable Margin for such LIBOR Advance, payable in arrears on the last day of such Interest Period and, in the event of the payment of
principal of such LIBOR Advance on a day other than such last day, on the date of such payment (to the extent of interest accrued on the amount of principal repaid). 

(d) Each Base Rate Advance shall bear interest at a rate per annum equal to the Base Rate plus the Applicable Margin for such Base Rate
Advance, payable in arrears on each Regular Distribution Date and, in the event of the payment of principal of such Base Rate Advance on a day other than a Regular Distribution Date, on the date of such payment (to the extent of interest accrued on
the amount of principal repaid). 
 (e) Each outstanding Unapplied Non-Extension Advance, Unapplied
Downgrade Advance and Unapplied Special Termination Advance shall bear interest in an amount equal to the Investment Earnings on amounts on deposit in the Class B Cash Collateral Account plus the Applicable Margin for such Unapplied Non-Extension Advance, Unapplied Downgrade Advance or Unapplied Special Termination Advance, as applicable, on the amount of such Unapplied Non-Extension Advance, Unapplied
Downgrade Advance or Unapplied Special Termination Advance, as applicable, from time to time, payable in arrears on each Regular Distribution Date. 

(f) Each amount not paid when due hereunder (whether fees, commissions, expenses or other amounts or, to the extent permitted by applicable
law, installments of interest on Advances but excluding Advances) shall bear interest at a rate per annum equal to the Base Rate plus 2.00% per annum until paid. 

(g) If at any time, the Liquidity Provider shall have determined (which determination shall be conclusive and binding upon the Borrower, absent
manifest error) that, by reason of circumstances affecting the relevant interbank lending market generally, the LIBOR Rate determined or to be determined for the current or the immediately succeeding Interest Period will not adequately and fairly
reflect the cost to the Liquidity Provider (as conclusively certified by the Liquidity Provider, absent manifest error) of making or maintaining LIBOR Advances, the Liquidity Provider shall give facsimile or telephonic notice thereof (a
“Rate Determination Notice”) to the Borrower (any such telephonic notice to be promptly confirmed in writing and transmitted by telecopier to the Borrower in accordance with Section 7.02). If such notice is given, then
the outstanding principal amount of the LIBOR Advances shall be converted to Base Rate Advances effective from the date of the Rate Determination Notice; provided that the Applicable Liquidity Rate in respect of such Base Rate Advances shall
be increased by one percent (1.00%). The Liquidity Provider shall withdraw a Rate Determination Notice given hereunder when the Liquidity Provider determines that the circumstances giving rise to such Rate Determination Notice no longer apply to the
Liquidity Provider, and the Base Rate Advances shall be converted to LIBOR Advances effective as of the first day of the next succeeding Interest Period after the date of such withdrawal. 

  
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 (h) Each change in the Base Rate shall become effective immediately. The rates of interest
specified in this Section 3.07 with respect to any Advance or other amount shall be referred to as the “Applicable Liquidity Rate”. 

Section 3.08 Replacement of Borrower. From time to time and subject to the successor Borrower’s meeting the eligibility
requirements set forth in Section 6.9 of the Intercreditor Agreement applicable to the Subordination Agent, upon the effective date and time specified in a written and completed Notice of Replacement Subordination Agent in substantially the
form of Annex VI attached hereto (a “Notice of Replacement Subordination Agent”) delivered to the Liquidity Provider by the then Borrower, the successor Borrower designated therein shall be substituted for the Borrower for
all purposes hereunder. 
 Section 3.09 Funding Loss Indemnification. The Borrower shall pay to the Liquidity Provider, upon the
request of the Liquidity Provider, such amount or amounts as shall be sufficient (in the reasonable opinion of the Liquidity Provider) to compensate it for any loss, cost, or expense incurred by reason of the liquidation or redeployment of deposits
or other funds acquired by the Liquidity Provider to fund or maintain any LIBOR Advance (but excluding loss of anticipated profits) incurred as a result of: 

(1) Any repayment of a LIBOR Advance on a date other than the last day of the Interest Period for such Advance; or 

(2) Any failure by the Borrower to borrow a LIBOR Advance on the date for borrowing specified in the relevant notice under
Section 2.02. 
 Calculation of all amounts payable to the Liquidity Provider under this Section 3.09 shall be made as though the
Liquidity Provider had actually funded the related LIBOR Advance through the purchase of a LIBOR deposit bearing interest at the LIBOR Rate in an amount equal to its LIBOR Advance and having a maturity comparable to the relevant Interest Period;
provided, however, that the Liquidity Provider may fund any LIBOR Advance in any manner it sees fit and the foregoing assumptions shall be utilized only for the purposes of calculating amounts payable under this Section 3.09. 

Section 3.10 Illegality. Notwithstanding any other provision in this Agreement, if any change in any applicable law, rule or
regulation, or any change in the interpretation or administration thereof by any governmental authority, central bank or comparable agency charged with the interpretation or administration thereof, or compliance by the Liquidity Provider (or its
Facility Office) with any request or directive (whether or not having the force of law) of any such authority, central bank or comparable agency shall make it unlawful or impossible for the Liquidity Provider (or its Facility Office) to maintain or
fund its LIBOR Advances, then upon notice to the Borrower by the Liquidity Provider, the outstanding principal amount of the LIBOR Advances shall be converted to Base Rate Advances (a) immediately upon demand of the Liquidity Provider, if such
change or compliance with such request, in the judgment of the Liquidity Provider, requires immediate repayment; or (b) at the expiration of the last Interest Period to expire before the effective date of any such change or request. The
Liquidity Provider agrees to use reasonable efforts (consistent with applicable legal and regulatory restrictions) to change the jurisdiction of its Facility Office if making such change would avoid or cure the aforesaid illegality and would not, in
the reasonable judgment of the Liquidity Provider, be otherwise disadvantageous to the Liquidity Provider. 

  
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 ARTICLE IV 

CONDITIONS PRECEDENT 

Section 4.01 Conditions Precedent to Effectiveness of Section 2.01. Section 2.01 of this Agreement shall
become effective on and as of the first date (the “Effective Date”) on which the following conditions precedent have been satisfied or waived: 

(a) The Liquidity Provider shall have received each of the following, and in the case of each document delivered pursuant to
paragraphs (i), (ii) and (iii), each in form and substance satisfactory to the Liquidity Provider: 
 (i) This Agreement duly executed
on behalf of the Borrower and the Fee Letter applicable to this Agreement duly executed on behalf of the Borrower and United; 
 (ii) The
Intercreditor Agreement duly executed on behalf of each of the parties thereto (other than the Liquidity Provider); 
 (iii) Fully executed
copies of each of the Operative Agreements executed and delivered on or before the Class B Closing Date (other than this Agreement, the Fee Letter applicable to this Agreement and the Intercreditor Agreement); 

(iv) A copy of the Prospectus Supplement and specimen copies of the Class B Certificates; 

(v) An executed copy of each document, instrument, certificate and opinion delivered on or before the Class B Closing Date pursuant to the
Class B Trust Agreement, the Note Purchase Agreement, the Intercreditor Agreement and the other Operative Agreements (in the case of each such opinion delivered in connection with the issuance and sale of the Class B Certificates, other
than the opinion of counsel for the Class B Underwriters, either addressed to the Liquidity Provider or accompanied by a letter from the counsel rendering such opinion to the effect that the Liquidity Provider is entitled to rely on such
opinion as of its date as if it were addressed to the Liquidity Provider); 
 (vi) Evidence that there shall have been made and shall be in
full force and effect, all filings, recordings and/or registrations, and there shall have been given or taken any notice or other similar action as may be reasonably necessary or, to the extent reasonably requested by the Liquidity Provider,
reasonably advisable, in order to establish, perfect, protect and preserve the right, title and interest, remedies, powers, privileges, liens and security interests of, or for the benefit of, the Trustees, the Borrower and the Liquidity Provider
created by the Operative Agreements executed and delivered on or before the Class B Closing Date; 

  
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 (vii) An agreement from United, pursuant to which (i) United agrees to provide to the
Liquidity Provider (A) within 90 days after the end of each of the first three fiscal quarters in each fiscal year of United, a consolidated balance sheet of United as of the end of such quarter and related statements of income and cash flows
for the period commencing at the end of the previous fiscal year and ending with the end of such quarter, setting forth in each case in comparative form the corresponding figures for the corresponding period in the preceding fiscal year, prepared in
accordance with GAAP; provided, that so long as United is subject to the reporting requirements of the Securities Exchange Act of 1934, as amended, a copy of United’s report on Form 10-Q for such
fiscal quarter (excluding exhibits) or a written notice of United that such report has been filed with the Securities and Exchange Commission, providing a website address at which such report may be accessed and confirming that the report accessible
at such website address conforms to the original report filed with the Securities and Exchange Commission will satisfy this subclause (A), and (B) within 120 days after the end of each fiscal year of United, a consolidated balance sheet of
United as of the end of such fiscal year and related statements of income and cash flows of United for such fiscal year, in comparative form with the preceding fiscal year, prepared in accordance with GAAP, together with a report of United’s
independent certified public accountants with respect to their audit of such financial statements; provided, that so long as United is subject to the reporting requirements of the Securities Exchange Act of 1934, as amended, a copy of United’s
report on Form 10-K for such fiscal year (excluding exhibits) or a written notice of United that such report has been filed with the Securities and Exchange Commission, providing a website address at
which such report may be accessed and confirming that the report accessible at such website address conforms to the original report filed with the Securities and Exchange Commission will satisfy this subclause (B), and (ii) United agrees
to allow the Liquidity Provider to inspect United’s books and records regarding such transactions, and to discuss such transactions with officers and employees of United; 

(viii) Legal opinions from (a) Morris James LLP, special counsel to the Borrower, and (b) Hughes Hubbard & Reed LLP, special
counsel to United, each in form and substance reasonably satisfactory to the Liquidity Provider; and 
 (ix) Such other documents,
instruments, opinions and approvals pertaining to the transactions contemplated hereby or by the other Operative Agreements as the Liquidity Provider shall have reasonably requested, including, without limitation, such documentation as the Liquidity
Provider may require to satisfy its “know your customer” policies. 
 (b) The following statement shall be true on and as of the
Effective Date: no event has occurred and is continuing, or would result from the entering into of this Agreement or the making of any Advance, which constitutes a Liquidity Event of Default. 

(c) The Liquidity Provider shall have received payment in full of all fees and other sums required to be paid to or for the account of the
Liquidity Provider on or prior to the Effective Date. 
 (d) All conditions precedent to the issuance of the Class B Certificates under
the Class B Trust Agreements shall have been satisfied or waived, and all conditions precedent to the purchase of the Class B Underwriters under the Class B Underwriting Agreement shall have been satisfied or waived. 

  
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 (e) The Borrower shall have received a certificate, dated the date hereof, signed by a duly
authorized representative of the Liquidity Provider, certifying that all conditions precedent to the effectiveness of Section 2.01 have been satisfied or waived. 

Section 4.02 Conditions Precedent to Borrowing. The obligation of the Liquidity Provider to make an Advance on the occasion of
each Borrowing shall be subject to the conditions precedent that the Effective Date shall have occurred and, on or prior to the date of such Borrowing, the Borrower shall have delivered a Notice of Borrowing which conforms to the terms and
conditions of this Agreement and has been completed as may be required by the relevant form of the Notice of Borrowing for the type of Advance requested. 

Section 4.03 Representations and Warranties. The representations and warranties of the Borrower as Subordination Agent in
Section 5.2 of the Participation Agreements shall be deemed to be incorporated into this Agreement as if set out in full herein and as if such representations and warranties were made by the Borrower to the Liquidity Provider. 

ARTICLE V 

COVENANTS 

Section 5.01 Affirmative Covenants of the Borrower. So long as any Advance shall remain unpaid or the Liquidity Provider shall
have any Maximum Commitment hereunder or the Borrower shall have any obligation to pay any amount to the Liquidity Provider hereunder, the Borrower will, unless the Liquidity Provider shall otherwise consent in writing: 

(a) Performance of this and Other Agreements. Punctually pay or cause to be paid all amounts payable by it under this Agreement and the
other Operative Agreements and observe and perform in all material respects the conditions, covenants and requirements applicable to it contained in this Agreement and the other Operative Agreements. 

(b) Reporting Requirements. Furnish to the Liquidity Provider with reasonable promptness, such information and data with respect to the
transactions contemplated by the Operative Agreements as from time to time may be reasonably requested by the Liquidity Provider; and permit the Liquidity Provider, upon reasonable notice, to inspect the Borrower’s books and records with
respect to such transactions and to meet with officers and employees of the Borrower to discuss such transactions. 
 (c) Certain
Operative Agreements. Furnish to the Liquidity Provider with reasonable promptness, such Operative Agreements entered into after the date hereof as from time to time may be reasonably requested by the Liquidity Provider. 

Section 5.02 Negative Covenants of the Borrower. So long as any Advance shall remain unpaid or the Liquidity Provider shall have
any Maximum Commitment hereunder or the Borrower shall have any obligation to pay any amount to the Liquidity Provider hereunder, the Borrower will not appoint or permit or suffer to be appointed any successor Borrower without the prior written
consent of the Liquidity Provider, which consent shall not be unreasonably withheld or delayed. 

  
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 ARTICLE VI 

LIQUIDITY EVENTS OF DEFAULT AND SPECIAL TERMINATION 

Section 6.01 Liquidity Events of Default. If (a) any Liquidity Event of Default has occurred and is continuing and
(b) there is a Performing Note Deficiency, the Liquidity Provider may, in its discretion, deliver to the Borrower a Termination Notice, the effect of which shall be to cause (i) the obligation of the Liquidity Provider to make Advances
hereunder to expire on the fifth Business Day after the date on which such Termination Notice is received by the Borrower, (ii) the Borrower to promptly request, and the Liquidity Provider to promptly make, a Final Advance in accordance with
Section 2.02(d) hereof and Section 3.5(i) of the Intercreditor Agreement, (iii) all other outstanding Advances to be automatically converted into Final Advances for purposes of determining the Applicable Liquidity Rate for interest
payable thereon, and (iv) subject to Sections 2.07 and 2.09 hereof, all Advances (including, without limitation, any Provider Advance and Applied Provider Advance), any accrued interest thereon and any other amounts outstanding hereunder
to become immediately due and payable to the Liquidity Provider. 
 Section 6.02 Special Termination. If the aggregate Pool
Balance of the Class B Certificates is greater than the aggregate outstanding principal amount of the Series B Equipment Notes (other than any Series B Equipment Notes previously sold or with respect to which the collateral securing such Series
B Equipment Notes has been disposed of) at any time during the 18 month period prior to March 1, 2026, the Liquidity Provider may, in its discretion, deliver to the Borrower a Special Termination Notice, the effect of which shall be to cause
(i) the obligation of the Liquidity Provider to make Advances hereunder to expire on the fifth Business Day after the date on which such Special Termination Notice is received by the Borrower, (ii) the Borrower to promptly request, and the
Liquidity Provider to promptly make, a Special Termination Advance in accordance with Section 2.02(g) and Section 3.5(m) of the Intercreditor Agreement, and (iii) subject to Sections 2.07 and 2.09, all Advances (including, without
limitation, any Provider Advance and Applied Provider Advance), any accrued interest thereon and any other amounts outstanding hereunder to become immediately due and payable to the Liquidity Provider. 

ARTICLE VII 

MISCELLANEOUS 

Section 7.01 Amendments, Etc. No amendment or waiver of any provision of this Agreement, nor consent to any departure by the
Borrower therefrom, shall in any event be effective unless the same shall be in writing and signed by the Liquidity Provider, and, in the case of an amendment or of a waiver by the Borrower, the Borrower, and then such waiver or consent shall be
effective only in the specific instance and for the specific purpose for which given. 

  
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 Section 7.02 Notices, Etc. Except as otherwise expressly provided herein, all
notices and other communications provided for hereunder shall be in writing (including telecopier and mailed or delivered or sent by telecopier) addressed to the applicable party at its address specified on Schedule B or to such other address as
shall be designated by such Person in a written notice to the others. The Borrower shall give all Notices of Borrowing via telecopier; provided, that, in the event of a transmission failure, the Borrower shall use reasonable efforts to
deliver the applicable Notice of Borrowing to the Liquidity Provider on the same Business Day using such other means as may be reasonably deemed necessary by the Borrower. All such notices and communications shall be effective (i) if given by
telecopier, when transmitted to the telecopier number specified above, (ii) if given by mail, five Business Days after being deposited in the mails addressed as specified above, and (iii) if given by other means, when delivered at the
address specified above, except that written notices to the Liquidity Provider pursuant to the provisions of Article II and Article III hereof shall not be effective until received by the Liquidity Provider. A copy of all notices delivered
hereunder to either party shall in addition be delivered to each of the parties to the Participation Agreements at their respective addresses set forth therein. 

Section 7.03 No Waiver; Remedies. No failure on the part of the Liquidity Provider to exercise, and no delay in exercising, any
right under this Agreement shall operate as a waiver thereof; nor shall any single or partial exercise of any right under this Agreement preclude any other or further exercise thereof or the exercise of any other right. The remedies herein provided
are cumulative and not exclusive of any remedies provided by law. 
 Section 7.04 Further Assurances. The Borrower agrees to do
such further acts and things and to execute and deliver to the Liquidity Provider such additional assignments, agreements, powers and instruments as the Liquidity Provider may reasonably require or deem advisable to carry into effect the purposes of
this Agreement and the other Operative Agreements or to better assure and confirm unto the Liquidity Provider its rights, powers and remedies hereunder and under the other Operative Agreements. 

Section 7.05 Indemnification; Survival of Certain Provisions. The Liquidity Provider shall be indemnified hereunder to the extent
and in the manner described in Section 8.1 of the Participation Agreements. In addition, the Borrower agrees to indemnify, protect, defend and hold harmless the Liquidity Provider from, against and in respect of, and shall pay on demand, all
Expenses of any kind or nature whatsoever (other than any Expenses of the nature described in Section 3.01, 3.02 or 7.07 hereof or in the Fee Letter applicable to this Agreement (regardless of whether indemnified against pursuant to said
Sections or in such Fee Letter)), that may be imposed, incurred by or asserted against any Liquidity Indemnitee, in any way relating to, resulting from, or arising out of or in connection with any action, suit or proceeding by any third party
against such Liquidity Indemnitee and relating to this Agreement, the Fee Letter applicable to this Agreement, the Intercreditor Agreement or any Financing Agreement; provided, however, that the Borrower shall not be required to
indemnify, protect, defend and hold harmless any Liquidity Indemnitee in respect of any Expense of such Liquidity Indemnitee to the extent such Expense is (i) attributable to the gross negligence or willful misconduct of such Liquidity
Indemnitee or any other Liquidity Indemnitee, (ii) ordinary and usual operating overhead expense, or (iii) attributable to the failure by such Liquidity Indemnitee or any other Liquidity Indemnitee to perform or observe any agreement,
covenant or condition on its part to be performed or observed in this Agreement, the Intercreditor Agreement, the Fee Letter applicable to this Agreement or any other Operative Agreement to which it is a party. The indemnities contained in
Section 8.1 of the Participation Agreements, and the provisions of Sections 3.01, 3.02, 3.03, 3.09, 7.05 and 7.07 hereof, shall survive the termination of this Agreement. 

  
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 Section 7.06 Liability of the Liquidity Provider. (a) Neither the Liquidity
Provider nor any of its officers, employees, directors or Affiliates shall be liable or responsible for: (i) the use which may be made of the Advances or any acts or omissions of the Borrower or any beneficiary or transferee in connection
therewith; (ii) the validity, sufficiency or genuineness of documents, or of any endorsement thereon, even if such documents should prove to be in any or all respects invalid, insufficient, fraudulent or forged; or (iii) the making of
Advances by the Liquidity Provider against delivery of a Notice of Borrowing and other documents which do not comply with the terms hereof; provided, however, that the Borrower shall have a claim against the Liquidity Provider, and the
Liquidity Provider shall be liable to the Borrower, to the extent of any damages suffered by the Borrower which were the result of (A) the Liquidity Provider’s willful misconduct or negligence in determining whether documents presented
hereunder comply with the terms hereof, or (B) any breach by the Liquidity Provider of any of the terms of this Agreement, including, but not limited to, the Liquidity Provider’s failure to make lawful payment hereunder after the delivery
to it by the Borrower of a Notice of Borrowing strictly complying with the terms and conditions hereof. In no event, however, shall the Liquidity Provider be liable on any theory of liability for any special, indirect, consequential or punitive
damages (including, without limitation, any loss of profits, business or anticipated savings). 
 (b) Neither the Liquidity Provider nor any
of its officers, employees, directors or Affiliates shall be liable or responsible in any respect for (i) any error, omission, interruption or delay in transmission, dispatch or delivery of any message or advice, however transmitted, in
connection with this Agreement or any Notice of Borrowing delivered hereunder, or (ii) any action, inaction or omission which may be taken by it in good faith, absent willful misconduct or gross negligence (in which event the extent of the
Liquidity Provider’s potential liability to the Borrower shall be limited as set forth in the immediately preceding paragraph), in connection with this Agreement or any Notice of Borrowing. 

Section 7.07 Costs, Expenses and Taxes. The Borrower agrees to pay, or cause to be paid (A) on the Effective Date and on such
later date or dates on which the Liquidity Provider shall make demand, all reasonable out-of-pocket costs and expenses (including, without limitation, the reasonable
fees and expenses of outside counsel for the Liquidity Provider) of the Liquidity Provider in connection with the preparation, negotiation, execution, delivery, filing and recording of this Agreement, any other Operative Agreement and any other
documents which may be delivered in connection with this Agreement and (B) on demand, all reasonable costs and expenses (including reasonable counsel fees and expenses) of the Liquidity Provider in connection with (i) the enforcement of
this Agreement or any other Operative Agreement, (ii) the modification or amendment of, or supplement to, this Agreement or any other Operative Agreement or such other documents which may be delivered in connection herewith or therewith
(whether or not the same shall become effective) or any waiver or consent thereunder (whether or not the same shall be effective), (iii) the replacement of this Agreement by a Replacement Liquidity Facility pursuant to Section 3.5(e)(i) of the
Intercreditor Agreement or (iv) any action or proceeding relating to any order, injunction, or other process or decree restraining or seeking to restrain the Liquidity Provider from paying any amount under this Agreement, the Intercreditor
Agreement or any other Operative Agreement or otherwise affecting the application 

  
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of funds in the Class B Cash Collateral Account. In addition, the Borrower shall pay any and all recording, stamp and other similar taxes and fees payable or determined to be payable in
connection with the execution, delivery, filing and recording of this Agreement, any other Operative Agreement and such other documents, and agrees to hold the Liquidity Provider harmless from and against any and all liabilities with respect to or
resulting from any delay in paying or omission to pay such taxes or fees. 
 Section 7.08 Binding Effect; Participations.
(a) This Agreement shall be binding upon and inure to the benefit of the Borrower and the Liquidity Provider and their respective successors and assigns, except that neither the Liquidity Provider (except as otherwise provided in this
Section 7.08 and in Section 3.5(l) of the Intercreditor Agreement) nor (except as contemplated by Section 3.08) the Borrower shall have the right to assign its rights or obligations hereunder or any interest herein without the prior
written consent of the other party, subject to the requirements of Section 7.08(b). The Liquidity Provider may grant participations herein or in any of its rights hereunder (including, without limitation, funded participations and
participations in rights to receive interest payments hereunder) and under the other Operative Agreements to such Persons (other than United and its Affiliates) as the Liquidity Provider may in its sole discretion select, subject to the requirements
of Section 7.08(b). No such granting of participations by the Liquidity Provider, however, will relieve the Liquidity Provider of its obligations hereunder. In connection with any participation or any proposed participation, the Liquidity
Provider may disclose to the participant or the proposed participant any information that the Borrower is required to deliver or to disclose to the Liquidity Provider pursuant to this Agreement. The Borrower acknowledges and agrees that the
Liquidity Provider’s source of funds may derive in part from its participants. Accordingly, references in this Agreement and the other Operative Agreements to determinations, reserve, capital adequacy and liquidity coverage requirements,
increased costs, reduced receipts, additional amounts due pursuant to Section 3.03 and the like as they pertain to the Liquidity Provider shall be deemed also to include those of each of its participants that are banks (subject, in each case,
to the maximum amount that would have been incurred by or attributable to the Liquidity Provider directly if the Liquidity Provider, rather than the participant, had held the interest participated). 

(b) If, pursuant to subsection (a) above, the Liquidity Provider sells any participation in this Agreement to any bank or other entity
(each, a “Transferee”), then, concurrently with the effectiveness of such participation, the Transferee shall (i) represent to the Liquidity Provider (for the benefit of the Liquidity Provider and the Borrower) either
(A) that it is incorporated under the laws of the United States or a state thereof or (B) that under applicable law and treaties, no taxes will be required to be withheld with respect to any payments to be made to such Transferee in
respect of this Agreement, (ii) furnish to the Liquidity Provider and the Borrower either (x) a statement that it is incorporated under the laws of the United States or a state thereof or (y) if it is not so incorporated, two copies
of a properly completed United States Internal Revenue Service Form W-8ECI, Form W-8BEN-E or Form
W-9, as appropriate, or other applicable form, certificate or document prescribed by the Internal Revenue Service certifying, in each case, such Transferee’s entitlement to a complete exemption from
United States federal withholding tax in respect to any and all payments to be made hereunder, and (iii) agree (for the benefit of the Liquidity Provider and the Borrower) to provide the Liquidity Provider and the Borrower a new Form W-8ECI, Form W-8BEN-E or Form W-9, as appropriate, (A) on or before the date that any such
form expires or becomes obsolete or (B) after the occurrence of any event 

  
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requiring a change in the most recent form previously delivered by it and prior to the immediately following due date of any payment by the Borrower hereunder, certifying in the case of a Form W-8ECI, Form W-8BEN-E or Form W-9 that such Transferee is entitled to a complete exemption from
United States federal withholding tax on payments under this Agreement. Unless the Borrower has received forms or other documents reasonably satisfactory to it (and required by applicable law) indicating that payments hereunder are not subject to
United States federal withholding tax, the Borrower will withhold taxes as required by law from such payments at the applicable statutory rate. 

(c) Notwithstanding the other provisions of this Section 7.08, the Liquidity Provider may assign and pledge all or any portion of the
Advances owing to it to any Federal Reserve Bank or the United States Treasury as collateral security pursuant to Regulation A of the Board of Governors of the Federal Reserve System and any Operating Circular issued by such Federal Reserve Bank,
provided that any payment in respect of such assigned Advances made by the Borrower to the Liquidity Provider in accordance with the terms of this Agreement shall satisfy the Borrower’s obligations hereunder in respect of such assigned Advance
to the extent of such payment. No such assignment shall release the Liquidity Provider from its obligations hereunder. 
 Section 7.09
Severability. Any provision of this Agreement which is prohibited, unenforceable or not authorized in any jurisdiction shall, as to such jurisdiction, be ineffective to the extent of such prohibition, unenforceability or non-authorization without invalidating the remaining provisions hereof or affecting the validity, enforceability or legality of such provision in any other jurisdiction. 

Section 7.10 GOVERNING LAW. THIS AGREEMENT SHALL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH, THE LAW OF THE STATE OF NEW
YORK. 
 Section 7.11 Submission to Jurisdiction; Waiver of Jury Trial; Waiver of Immunity. (a) Each of the parties hereto
hereby irrevocably and unconditionally: 
 (i) submits for itself and its property in any legal action or proceeding relating to this
Agreement or any other Operative Agreement, or for recognition and enforcement of any judgment in respect hereof or thereof, to the nonexclusive general jurisdiction of the courts of the State of New York, the courts of the United States of America
for the Southern District of New York, and the appellate courts from any thereof; 
 (ii) consents that any such action or proceeding may be
brought in such courts, and waives any objection that it may now or hereafter have to the venue of any such action or proceeding in any such court or that such action or proceeding was brought in an inconvenient court and agrees not to plead or
claim the same; 
 (iii) agrees that service of process in any such action or proceeding may be effected by mailing a copy thereof by
registered or certified mail (or any substantially similar form of mail), postage prepaid, to each party hereto at its address set forth in Section 7.02 hereof, or at such other address of which the Liquidity Provider shall have been notified
pursuant thereto; and 

  
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 (iv) agrees that nothing herein shall affect the right to effect service of process in any
other manner permitted by law or shall limit the right to sue in any other jurisdiction. 
 (b) THE BORROWER AND THE LIQUIDITY PROVIDER EACH
HEREBY AGREE TO WAIVE THEIR RESPECTIVE RIGHTS TO A JURY TRIAL OF ANY CLAIM OR CAUSE OF ACTION BASED UPON OR ARISING OUT OF THIS AGREEMENT OR ANY DEALINGS BETWEEN THEM RELATING TO THE SUBJECT MATTER OF THIS AGREEMENT AND THE RELATIONSHIP THAT IS
BEING ESTABLISHED, including, without limitation, contract claims, tort claims, breach of duty claims and all other common law and statutory claims. The Borrower and the Liquidity Provider each warrant and represent that it has reviewed this waiver
with its legal counsel, and that it knowingly and voluntarily waives its jury trial rights following consultation with such legal counsel. THIS WAIVER IS IRREVOCABLE, AND CANNOT BE MODIFIED EITHER ORALLY OR IN WRITING, AND THIS WAIVER SHALL APPLY TO
ANY SUBSEQUENT AMENDMENTS, RENEWALS, SUPPLEMENTS OR MODIFICATIONS TO THIS AGREEMENT. 
 (c) To the extent that the Liquidity Provider or any
of its properties has or may hereafter acquire any right of immunity, whether characterized as sovereign immunity or otherwise, and whether under the United States Foreign Sovereign Immunities Act of 1976 (or any successor legislation) or otherwise,
from any legal proceedings, whether in the United States or elsewhere, to enforce or collect upon this Agreement, including, without limitation, immunity from suit or service of process, immunity from jurisdiction or judgment of any court or
tribunal or execution of a judgment, or immunity of any of its property from attachment prior to any entry of judgment, or from attachment in aid of execution upon a judgment, the Liquidity Provider hereby irrevocably and expressly waives any such
immunity, and agrees not to assert any such right or claim in any such proceeding, whether in the United States or elsewhere. 

Section 7.12 Execution in Counterparts. This Agreement may be executed in any number of counterparts and by different parties
hereto on separate counterparts, each of which counterparts, when so executed and delivered, shall be deemed to be an original and all of which counterparts, taken together, shall constitute but one and the same Agreement. 

Section 7.13 Entirety. This Agreement, the Intercreditor Agreement and the other Operative Agreements to which the Liquidity
Provider is a party constitute the entire agreement of the parties hereto with respect to the subject matter hereof and supersedes all prior understandings and agreements of such parties. 

Section 7.14 Headings. Section headings in this Agreement are included herein for convenience of reference only and shall not
constitute a part of this Agreement for any other purpose. 

  
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 Section 7.15 Transfer. The Liquidity Provider hereby acknowledges and consents to
the Transfer contemplated by the Assignment and Assumption Agreement. Upon the occurrence of the Transfer contemplated by the Assignment and Assumption Agreement, the Class B Trustee shall (without any further act) be deemed to have transferred
all of its rights, title, interest and obligations in, to and under this Agreement to the trustee of the Successor Trust and the trustee of the Successor Trust shall (without any further act) be deemed to have assumed all of the Class B
Trustee’s rights, title, interest and obligations in, to and under this Agreement, and, thereafter, each reference to the Borrower herein and in the other Operative Agreements shall be deemed a reference to the trustee of the Successor Trust.

 Section 7.16 LIQUIDITY PROVIDER’S OBLIGATION TO MAKE ADVANCES. EXCEPT AS EXPRESSLY SET FORTH IN THIS
AGREEMENT, THE OBLIGATIONS OF THE LIQUIDITY PROVIDER TO MAKE ADVANCES HEREUNDER, AND THE BORROWER’S RIGHTS TO DELIVER NOTICES OF BORROWING REQUESTING THE MAKING OF ADVANCES HEREUNDER, SHALL BE UNCONDITIONAL AND IRREVOCABLE, AND SHALL BE PAID OR
PERFORMED, IN EACH CASE STRICTLY IN ACCORDANCE WITH THE TERMS OF THIS AGREEMENT. 
 Section 7.17 Patriot Act. In compliance with
the USA Patriot Act and 31 CFR Part 103.121 and, in the case of a non-U.S. entity, any other similar requirements of the relevant foreign jurisdiction, when requested the Borrower shall provide to the
Liquidity Provider certain information relating to the Borrower that the Liquidity Provider may be required to obtain and keep on file, including the Borrower’s name, address and various identifying documents. 

Section 7.18 Head Office Obligations. The Liquidity Provider is National Australia Bank Limited, acting through its New York
Branch. The Liquidity Provider hereby agrees that, notwithstanding the place of booking or its jurisdiction of incorporation or organization, the obligations of the Liquidity Provider hereunder are also the obligations of the head office of National
Australia Bank Limited in Melbourne, Australia (the “Head Office”). Accordingly, any beneficiary of this Agreement will be able to proceed directly against the Head Office, if the Liquidity Provider defaults in its obligations to
such beneficiary under this Agreement. 
 Section 7.19 Acknowledgement and Consent to
Bail-In of EEA Financial Institutions. Notwithstanding anything to the contrary in this Agreement or in any other agreement, arrangement or understanding among any such parties, each party hereto
acknowledges that any liability of any EEA Financial Institution arising under this Agreement, to the extent such liability is unsecured, may be subject to the write-down and conversion powers of an EEA Resolution Authority and agrees and consents
to, and acknowledges and agrees to be bound by: 
 (a) the application of any write-down or conversion powers by an EEA Resolution Authority
to any such liabilities arising hereunder which may be payable to it by any party hereto that is an EEA Financial Institution; and 
 (b) the
effects of any Bail-in Action on any such liability, including, if applicable: 
 (i) a reduction, in
full or in part, of any such liability; 
 (ii) a conversion of all, or a portion of, such liability into shares or other instruments of
ownership in such EEA Financial Institution, its parent undertaking, or a bridge institution and that such shares or other instruments of ownership will be accepted by it in lieu of any rights with respect to any such liability under this Agreement;
or 

  
 30 

 [Revolving Credit Agreement (2018-1B)] 

 

 (iii) the variation of the terms of such liability in connection with the exercise of the
write-down and conversion powers of any EEA Resolution Authority. 

  
 31 

 IN WITNESS WHEREOF, the parties have caused this Agreement to be duly executed and
delivered by their respective officers thereunto duly authorized as of the date first set forth above. 
  

			
	WILMINGTON TRUST, NATIONAL ASSOCIATION, not in its individual capacity but solely as Subordination Agent, as agent and trustee for the Class B Trust, as Borrower
		
	By:	 	 /s/ Jose L. Paredes

		 	Name: Jose L. Paredes
		 	Title:   Assistant Vice President
	
	NATIONAL AUSTRALIA BANK LIMITED, ACTING THROUGH ITS NEW YORK BRANCH,
	as Liquidity Provider
		
	By:	 	 /s/ Daniel Carr

		 	Name: Daniel Carr
		 	Title:   Director

 Signature Page to Class B Revolving Credit Agreement 

 [Revolving Credit Agreement (2018-1B)] 

 

 SCHEDULE A 

TO 
 REVOLVING CREDIT
AGREEMENT 
 CERTAIN ECONOMIC TERMS 

1. Applicable Margin (Unpaid Advance (including, without limitation, any Applied Special Termination Advance but excluding any Unapplied Special Termination
Advance)/Applied Provider Advance): 3.75% per annum. 
 2. Initial Expiry Date: May 23, 2019. 

3. Liquidity Event of Default Delivery Period threshold: $400,000,000. 

4. Initial Maximum Commitment: $15,575,301. 
 5. Prospectus
Supplement date: May 9, 2018. 

  
 SCHEDULE A 

Page 1 

 [Revolving Credit Agreement (2018-1B)] 

 

 SCHEDULE B 

TO 
 REVOLVING CREDIT
AGREEMENT 
 ADMINISTRATION DETAILS 
  

			
	Borrower:	  	WILMINGTON TRUST, NATIONAL ASSOCIATION
		
	Address:	  	1100 North Market Square
		  	Wilmington, Delaware 19890-1605
		  	Attention: Corporate Capital Market Services
		  	Telephone: (302) 636-6296
		  	Telecopy: (302) 636-4140
		
	Liquidity Provider:	  	NATIONAL AUSTRALIA BANK LIMITED, acting through its New York Branch
		
	Address:	  	National Australia Bank Limited
		  	245 Park Avenue, 28th Floor
		  	New York, N.Y. 10167
		  	Attention: Cathy McManus
		  	Telephone: 212-916-9593
		  	Facsimile: 212-490-8087
		  	Email: ny_lending_administration@nabny.com
		
		  	with a copy to:
		
		  	National Australia Bank Limited
		  	245 Park Avenue
		  	New York, NY 10167
		  	Attention: Director, Asset Finance & Leasing
		  	Telephone: (212) 916-9500
		  	Facsimile: (212) 490-8087

 Account Details: 
  

			
	Name of Bank:	  	Citibank, New York
	ABA Number:	  	021000089
	Account Name	  	NAB NY Lending Administration
	Account Number:	  	362-44-437
	Reference:	  	United 2018-1 EETC

  
 SCHEDULE B 

Page 1 

 [Revolving Credit Agreement (2018-1B)] 

 

 ANNEX I 

TO 
 REVOLVING CREDIT
AGREEMENT 
 INTEREST ADVANCE NOTICE OF BORROWING 

The undersigned, a duly authorized signatory of the undersigned borrower (the “Borrower”), hereby certifies to
National Australia Bank Limited, acting through its New York Branch (the “Liquidity Provider”), with reference to the Revolving Credit Agreement (2018-1B) dated as of May 23, 2018,
between the Borrower and the Liquidity Provider (the “Liquidity Agreement”; the terms defined therein and not otherwise defined herein being used herein as therein defined or referenced), that: 

(1) The Borrower is the Subordination Agent under the Intercreditor Agreement. 

(2) The Borrower is delivering this Notice of Borrowing for the making of an Interest Advance by the Liquidity Provider to be
used, subject to clause (3)(v) below, for the payment of interest on the Class B Certificates which was payable on
                    ,          (the “Distribution Date”) in accordance
with the terms and provisions of the Class B Trust Agreement and the Class B Certificates, which Advance is requested to be made on [                ,
            ]1. The Interest Advance should be transferred to [name of bank/wire instructions/ABA number] in favor of
account number [     ], reference [     ]. 
 (3) The amount of the Interest Advance
requested hereby (i) is $[            ], to be applied in respect of the payment of the interest which was due and payable on the Class B Certificates on the Distribution
Date, (ii) does not include any amount with respect to the payment of principal of, or premium on, the Class B Certificates, or principal of, or interest or premium on, the Class AA Certificates, the Class A Certificates or any
Additional Certificates, (iii) was computed in accordance with the provisions of the Class B Certificates, the Liquidity Agreement, the Class B Trust Agreement and the Intercreditor Agreement (a copy of which computation is attached
hereto as Schedule I), (iv) does not exceed the Maximum Available Commitment on the date hereof, (v) does not include any amount of interest which was due and payable on the Class B Certificates on such Distribution Date but
which remains unpaid due to the failure of the Depositary to pay any amount of accrued interest on the Deposits on such Distribution Date and (vi) has not been and is not the subject of a prior or contemporaneous Notice of Borrowing. 

(4) Upon receipt by or on behalf of the Borrower of the amount requested hereby, (a) the Borrower will apply the same in
accordance with the terms of Section 3.5(b) of the Intercreditor Agreement, (b) no portion of such amount shall be applied by the Borrower for any other purpose and (c) no portion of such amount until so applied shall be
commingled with other funds held by the Borrower. 
  
  

	1	 If a Notice of Borrowing will be delivered prior to 1:00
p.m. (New York City time) on a Business Day, insert the date of the Notice of Borrowing. If a Notice of Borrowing will be delivered after 1:00 p.m. (New York City time) on a Business Day or on a day that is not a Business Day, insert the first
Business Day after the date of the Notice of Borrowing. 

  
 ANNEX I 

Page 1 

 [Revolving Credit Agreement (2018-1B)] 

 

 The Borrower hereby acknowledges that, pursuant to the Liquidity Agreement, the making of the
Interest Advance as requested by this Notice of Borrowing shall automatically reduce, subject to reinstatement in accordance with the terms of the Liquidity Agreement, the Maximum Available Commitment by an amount equal to the amount of the Interest
Advance requested to be made hereby as set forth in clause (i) of paragraph (3) of this Notice of Borrowing and such reduction shall automatically result in corresponding reductions in the amounts available to be borrowed pursuant to a
subsequent Advance. 

  
 ANNEX I 

Page 2 

 [Revolving Credit Agreement (2018-1B)] 

 

 IN WITNESS WHEREOF, the Borrower has executed and delivered this Notice of Borrowing
as of the      day of             ,     . 

 

			
	WILMINGTON TRUST, NATIONAL ASSOCIATION, not in its individual capacity but solely as Subordination Agent, as Borrower

 
			
		
	By:	 	  

		 	Name:
		 	Title:

  
 ANNEX I 

Page 3 

 [Revolving Credit Agreement (2018-1B)] 

 

 SCHEDULE I 

TO 
 INTEREST ADVANCE
NOTICE OF BORROWING 
 [Insert copy of computations in accordance with Interest Advance Notice of Borrowing] 

  
 ANNEX I 

Page 4 

 [Revolving Credit Agreement (2018-1B)] 

 

 ANNEX II 

TO 
 REVOLVING CREDIT
AGREEMENT 
 NON-EXTENSION ADVANCE NOTICE OF BORROWING 

The undersigned, a duly authorized signatory of the undersigned borrower (the “Borrower”), hereby certifies to
National Australia Bank Limited, acting through its New York Branch (the “Liquidity Provider”), with reference to the Revolving Credit Agreement (2018-1B) dated as of May 23, 2018,
between the Borrower and the Liquidity Provider (the “Liquidity Agreement”; the terms defined therein and not otherwise defined herein being used herein as therein defined or referenced), that: 

(1) The Borrower is the Subordination Agent under the Intercreditor Agreement. 

(2) The Borrower is delivering this Notice of Borrowing for the making of the
Non-Extension Advance by the Liquidity Provider to be used for the funding of the Class B Cash Collateral Account in accordance with Section 3.5(d) of the Intercreditor Agreement, which Advance is
requested to be made on [            ,     ]2. The
Non-Extension Advance should be transferred to [name of bank/wire instructions/ABA number] in favor of account number [     ], reference [     ]. 

(3) The amount of the Non-Extension Advance requested hereby (i) is
$            .    , which equals the Maximum Available Commitment on the date hereof and is to be applied in respect of the funding of the Class B
Cash Collateral Account in accordance with Section 3.5(d) of the Intercreditor Agreement, (ii) does not include any amount with respect to the payment of the principal of, or premium on, the Class B Certificates, or principal of, or
interest or premium on, the Class AA Certificates, the Class A Certificates or any Additional Certificates, (iii) was computed in accordance with the provisions of the Class B Certificates, the Liquidity Agreement, the
Class B Trust Agreement and the Intercreditor Agreement (a copy of which computation is attached hereto as Schedule I), and (iv) has not been and is not the subject of a prior or contemporaneous Notice of Borrowing under the Liquidity
Agreement. 
 (4) Upon receipt by or on behalf of the Borrower of the amount requested hereby, (a) the Borrower will
deposit such amount in the Class B Cash Collateral Account and apply the same in accordance with the terms of Section 3.5(d) of the Intercreditor Agreement, (b) no portion of such amount shall be applied by the Borrower for any other
purpose and (c) no portion of such amount until so applied shall be commingled with other funds held by the Borrower. 
  

 

	2	If a Notice of Borrowing will be delivered prior to 1:00 p.m. (New York City time) on a Business Day, insert the date of the Notice of Borrowing. If a Notice of
Borrowing will be delivered after 1:00 p.m. (New York City time) on a Business Day or on a day that is not a Business Day, insert the first Business Day after the date of the Notice of Borrowing. 

  
 ANNEX II 

Page 1 

 [Revolving Credit Agreement (2018-1B)] 

 

 The Borrower hereby acknowledges that, pursuant to the Liquidity Agreement, (A) the
making of the Non-Extension Advance as requested by this Notice of Borrowing shall automatically and irrevocably terminate the obligation of the Liquidity Provider to make further Advances under the Liquidity
Agreement; and (B) following the making by the Liquidity Provider of the Non-Extension Advance requested by this Notice of Borrowing, the Borrower shall not be entitled to request any further Advances
under the Liquidity Agreement. 

  
 ANNEX II 

Page 2 

 [Revolving Credit Agreement (2018-1B)] 

 

 IN WITNESS WHEREOF, the Borrower has executed and delivered this Notice of Borrowing
as of the      day of             ,     . 

 

			
	WILMINGTON TRUST, NATIONAL ASSOCIATION, not in its individual capacity but solely as Subordination Agent, as Borrower

 
			
		
	By:	 	  

 
			
		 	Name:
		 	Title:

  
 ANNEX II 

Page 3 

 [Revolving Credit Agreement (2018-1B)] 

 

 SCHEDULE I 

TO 
 NON-EXTENSION ADVANCE NOTICE OF BORROWING 
 [Insert copy of computations in accordance with Non-Extension Advance Notice of Borrowing] 

  
 ANNEX II 

Page 4 

 [Revolving Credit Agreement (2018-1B)] 

 

 ANNEX III 

TO 
 REVOLVING CREDIT
AGREEMENT 
 DOWNGRADE ADVANCE NOTICE OF BORROWING 

The undersigned, a duly authorized signatory of the undersigned borrower (the “Borrower”), hereby certifies to
National Australia Bank Limited, acting through its New York Branch (the “Liquidity Provider”), with reference to the Revolving Credit Agreement (2018-1B) dated as of May 23, 2018,
between the Borrower and the Liquidity Provider (the “Liquidity Agreement”; the terms defined therein and not otherwise defined herein being used herein as therein defined or referenced), that: 

(1) The Borrower is the Subordination Agent under the Intercreditor Agreement. 

(2) The Borrower is delivering this Notice of Borrowing for the making of the Downgrade Advance by the Liquidity Provider to be
used for the funding of the Class B Cash Collateral Account in accordance with Section 3.5(c) of the Intercreditor Agreement by reason of the occurrence of a Downgrade Event, which Advance is requested to be made on
[            ,     ]3. The Downgrade Advance should be transferred to [name of bank/wire
instructions/ABA number] in favor of account number [    ], reference [    ]. 

(3) The amount of the Downgrade Advance requested hereby (i) is
$            .    , which equals the Maximum Available Commitment on the date hereof and is to be applied in respect of the funding of the Class B
Cash Collateral Account in accordance with Section 3.5(c) of the Intercreditor Agreement, (ii) does not include any amount with respect to the payment of the principal of, or premium on, the Class B Certificates, or principal of, or
interest or premium on, the Class AA Certificates, the Class A Certificates or any Additional Certificates, (iii) was computed in accordance with the provisions of the Class B Certificates, the Liquidity Agreement, the
Class B Trust Agreement and the Intercreditor Agreement (a copy of which computation is attached hereto as Schedule I), and (iv) has not been and is not the subject of a prior or contemporaneous Notice of Borrowing under the Liquidity
Agreement. 
 (4) Upon receipt by or on behalf of the Borrower of the amount requested hereby, (a) the Borrower will
deposit such amount in the Class B Cash Collateral Account and apply the same in accordance with the terms of Section 3.5(c) of the Intercreditor Agreement, (b) no portion of such amount shall be applied by the Borrower for any other
purpose and (c) no portion of such amount until so applied shall be commingled with other funds held by the Borrower. 
  

 

	3	 If a Notice of Borrowing will be delivered prior to 1:00
p.m. (New York City time) on a Business Day, insert the date of the Notice of Borrowing. If a Notice of Borrowing will be delivered after 1:00 p.m. (New York City time) on a Business Day or on a day that is not a Business Day, insert the first
Business Day after the date of the Notice of Borrowing. 

  
 ANNEX III 

Page 1 

 [Revolving Credit Agreement (2018-1B)] 

 

 The Borrower hereby acknowledges that, pursuant to the Liquidity Agreement, (A) the
making of the Downgrade Advance as requested by this Notice of Borrowing shall automatically and irrevocably terminate the obligation of the Liquidity Provider to make further Advances under the Liquidity Agreement; and (B) following the making
by the Liquidity Provider of the Downgrade Advance requested by this Notice of Borrowing, the Borrower shall not be entitled to request any further Advances under the Liquidity Agreement, except in each case to the extent that the Maximum Commitment
is reinstated pursuant to Section 2.06(d) of the Liquidity Agreement. 

  
 ANNEX III 

Page 2 

 [Revolving Credit Agreement (2018-1B)] 

 

 IN WITNESS WHEREOF, the Borrower has executed and delivered this Notice of Borrowing
as of the      day of             ,     . 

 

			
	WILMINGTON TRUST, NATIONAL ASSOCIATION, not in its individual capacity but solely as Subordination Agent, as Borrower

 
			
		
	By:	 	
                 

 
			
		 	Name:
		 	Title:

  
 ANNEX III 

Page 3 

 [Revolving Credit Agreement (2018-1B)] 

 

 SCHEDULE I 

TO 
 DOWNGRADE ADVANCE
NOTICE OF BORROWING 
 [Insert copy of computations in accordance with Downgrade Advance Notice of Borrowing] 

  
 ANNEX III 

Page 4 

 [Revolving Credit Agreement (2018-1B)] 

 

 ANNEX IV 

TO 
 REVOLVING CREDIT
AGREEMENT 
 FINAL ADVANCE NOTICE OF BORROWING 

The undersigned, a duly authorized signatory of the undersigned borrower (the “Borrower”), hereby certifies to
National Australia Bank Limited, acting through its New York Branch (the “Liquidity Provider”), with reference to the Revolving Credit Agreement (2018-1B) dated as of May 23, 2018,
between the Borrower and the Liquidity Provider (the “Liquidity Agreement”; the terms defined therein and not otherwise defined herein being used herein as therein defined or referenced), that: 

(1) The Borrower is the Subordination Agent under the Intercreditor Agreement. 

(2) The Borrower is delivering this Notice of Borrowing for the making of the Final Advance by the Liquidity Provider to be
used for the funding of the Class B Cash Collateral Account in accordance with Section 3.5(i) of the Intercreditor Agreement by reason of the receipt by the Borrower of a Termination Notice from the Liquidity Provider with respect to the
Liquidity Agreement, which Advance is requested to be made on [            ,     ]4. The Final Advance
should be transferred to [name of bank/wire instructions/ABA number] in favor of account number [    ], reference [    ]. 

(3) The amount of the Final Advance requested hereby (i) is
$            .    , which equals the Maximum Available Commitment on the date hereof and is to be applied in respect of the funding of the Class B
Cash Collateral Account in accordance with Section 3.5(i) of the Intercreditor Agreement, (ii) does not include any amount with respect to the payment of principal of, or premium on, the Class B Certificates, or principal of, or
interest or premium on, the Class AA Certificates, the Class A Certificates or any Additional Certificates, (iii) was computed in accordance with the provisions of the Class B Certificates, the Liquidity Agreement, the
Class B Trust Agreement and the Intercreditor Agreement (a copy of which computation is attached hereto as Schedule I), and (iv) has not been and is not the subject of a prior or contemporaneous Notice of Borrowing. 

(4) Upon receipt by or on behalf of the Borrower of the amount requested hereby, (a) the Borrower will deposit such amount
in the Class B Cash Collateral Account and apply the same in accordance with the terms of Section 3.5(i) of the Intercreditor Agreement, (b) no portion of such amount shall be applied by the Borrower for any other purpose and
(c) no portion of such amount until so applied shall be commingled with other funds held by the Borrower. 
  

 

	4	 If a Notice of Borrowing will be delivered prior to 1:00
p.m. (New York City time) on a Business Day, insert the date of the Notice of Borrowing. If a Notice of Borrowing will be delivered after 1:00 p.m. (New York City time) on a Business Day or on a day that is not a Business Day, insert the first
Business Day after the date of the Notice of Borrowing. 

  
 ANNEX IV 

Page 1 

 [Revolving Credit Agreement (2018-1B)] 

 

 (5) The Borrower hereby requests that the Advance requested hereby be a Base
Rate Advance and that such Base Rate Advance be converted into a LIBOR Advance on the third Business Day following your receipt of this notice. 

The Borrower hereby acknowledges that, pursuant to the Liquidity Agreement, (A) the making of the Final Advance as requested by this
Notice of Borrowing shall automatically and irrevocably terminate the obligation of the Liquidity Provider to make further Advances under the Liquidity Agreement; and (B) following the making by the Liquidity Provider of the Final Advance
requested by this Notice of Borrowing, the Borrower shall not be entitled to request any further Advances under the Liquidity Agreement. 

  
 ANNEX IV 

Page 2 

 [Revolving Credit Agreement (2018-1B)] 

 

 IN WITNESS WHEREOF, the Borrower has executed and delivered this Notice of Borrowing
as of the      day of             ,    . 

 

			
	WILMINGTON TRUST, NATIONAL ASSOCIATION, not in its individual capacity but solely as Subordination Agent, as Borrower

 
			
		
	By:	 	
                 

 
			
		 	Name:
		 	Title:

  
 ANNEX IV 

Page 3 

 [Revolving Credit Agreement (2018-1B)] 

 

 SCHEDULE I 

TO 
 FINAL ADVANCE NOTICE
OF BORROWING 
 [Insert copy of computations in accordance with Final Advance Notice of Borrowing] 

  
 ANNEX IV 

Page 4 

 [Revolving Credit Agreement (2018-1B)] 

 

 ANNEX V 

TO 
 REVOLVING CREDIT
AGREEMENT 
 NOTICE OF TERMINATION 

[Date] 
 Wilmington Trust, National Association,

 as Subordination Agent, as Borrower 
 1100 North Market
Square 
 Wilmington, DE 19890-1605 
 Attention: Corporate
Trust Administration 
 Revolving Credit Agreement dated as of May 23, 2018 between Wilmington Trust, National Association, as
Subordination Agent, as agent and trustee for the United Airlines Pass Through Trust, 2018-1B, as Borrower, and National Australia Bank Limited, acting through its New York Branch (the “Liquidity
Agreement”) 
 Ladies and Gentlemen: 

You are hereby notified that pursuant to Section 6.01 of the Liquidity Agreement, by reason of the occurrence of a Liquidity Event of
Default and the existence of a Performing Note Deficiency, we are giving this notice to you in order to cause (i) our obligations to make Advances under such Liquidity Agreement to terminate on the fifth Business Day after the date on which you
receive this notice, (ii) you to request a Final Advance under the Liquidity Agreement pursuant to Section 3.5(i) of the Intercreditor Agreement as a consequence of your receipt of this notice and (iii) all other outstanding Advances
to be automatically converted into Final Advances for purposes of determining the Applicable Liquidity Rate for interest payable thereon. 

Terms used but not defined herein shall have the respective meanings ascribed thereto in or pursuant to the Liquidity Agreement. 

  
 ANNEX V 

Page 1 

 [Revolving Credit Agreement (2018-1B)] 

 

 THIS NOTICE IS THE “NOTICE OF TERMINATION” PROVIDED FOR UNDER THE LIQUIDITY
AGREEMENT. OUR OBLIGATIONS TO MAKE ADVANCES UNDER THE LIQUIDITY AGREEMENT WILL TERMINATE ON THE FIFTH BUSINESS DAY AFTER THE DATE ON WHICH YOU RECEIVE THIS NOTICE. 

 

			
	Very truly yours,
	
	NATIONAL AUSTRALIA BANK LIMITED, ACTING THROUGH ITS NEW YORK BRANCH, as Liquidity Provider
		
	By:	 	
                 

		 	Name:
		 	Title:
		
	By:	 	              

		 	Name:
		 	Title:

  

	cc:	Wilmington Trust, National Association, 

 as Class B Trustee 

  
 ANNEX V 

Page 2 

 [Revolving Credit Agreement (2018-1B)] 

 

 ANNEX VI 

TO 
 REVOLVING CREDIT
AGREEMENT 
 NOTICE OF REPLACEMENT SUBORDINATION AGENT 

[Date] 
 Attention: 

Revolving Credit Agreement dated as of May 23, 2018, between Wilmington Trust, National Association, as Subordination Agent, as agent and
trustee for the United Airlines Pass Through Trust, 2018-1B, as Borrower, and National Australia Bank Limited, acting through its New York Branch (the “Liquidity Agreement”) 

Ladies and Gentlemen: 
 For value received, the
undersigned beneficiary hereby irrevocably transfers to: 
  

 
 [Name of
Transferee] 
  
  

[Address of Transferee] 
 all rights and
obligations of the undersigned as Borrower under the Liquidity Agreement referred to above. The transferee has succeeded the undersigned as Subordination Agent under the Intercreditor Agreement referred to in the first paragraph of the Liquidity
Agreement, pursuant to the terms of Section 8.1 of the Intercreditor Agreement. 
 By this transfer, all rights of the undersigned as
Borrower under the Liquidity Agreement are transferred to the transferee and the transferee shall hereafter have the sole rights and obligations as Borrower thereunder. The undersigned shall pay any costs and expenses of such transfer, including,
but not limited to, transfer taxes or governmental charges. 
 We ask that this transfer be effective as of
            ,     . 
  

			
	WILMINGTON TRUST, NATIONAL ASSOCIATION, not in its individual capacity but solely as Subordination Agent, as Borrower
		
	By:	 	              

		 	Name:
		 	Title:

  
 ANNEX VI 

Page 1 

 [Revolving Credit Agreement (2018-1B)] 

 

 ANNEX VII 

TO 
 REVOLVING CREDIT
AGREEMENT 
 SPECIAL TERMINATION ADVANCE NOTICE OF BORROWING 

The undersigned, a duly authorized signatory of the undersigned borrower (the “Borrower”), hereby certifies to National Australia Bank
Limited, acting through its New York Branch (the “Liquidity Provider”), with reference to the Revolving Credit Agreement (2018-1B) dated as of May 23, 2018, between the
Borrower and the Liquidity Provider (the “Liquidity Agreement”; the terms defined therein and not otherwise defined herein being used herein as therein defined or referenced), that: 

(1) The Borrower is the Subordination Agent under the Intercreditor Agreement. 

(2) The Borrower is delivering this Notice of Borrowing for the making of the Special Termination Advance by the Liquidity
Provider to be used for the funding of the Class B Cash Collateral Account in accordance with Section 3.5(m) of the Intercreditor Agreement by reason of the receipt by the Borrower of a Special Termination Notice from the Liquidity
Provider with respect to the Liquidity Agreement, which Advance is requested to be made on [            ,
    ]5. The Special Termination Advance should be transferred to [name of bank/wire instructions/ABA number] in favor of account number
[    ], reference [    ]. 
 (3) The amount of the Special Termination Advance
requested hereby (i) is $            .    , which equals the Maximum Available Commitment on the date hereof and is to be applied in respect of the
funding of the Class B Cash Collateral Account in accordance with Section 3.5(m) of the Intercreditor Agreement, (ii) does not include any amount with respect to the payment of principal of, or premium on, the Class B
Certificates, or principal of, or interest or premium on, the Class AA Certificates, the Class A Certificates or any Additional Certificates, (iii) was computed in accordance with the provisions of the Class B Certificates, the
Liquidity Agreement, the Class B Trust Agreement and the Intercreditor Agreement (a copy of which computation is attached hereto as Schedule I), and (iv) has not been and is not the subject of a prior or contemporaneous Notice of
Borrowing. 
 (4) Upon receipt by or on behalf of the Borrower of the amount requested hereby, (a) the Borrower will
deposit such amount in the Class B Cash Collateral Account and apply the same in accordance with the terms of Section 3.5(m) of the Intercreditor Agreement, (b) no portion of such amount shall be applied by the Borrower for any other
purpose and (c) no portion of such amount until so applied shall be commingled with other funds held by the Borrower. 
  

 

	5	 If a Notice of Borrowing will be delivered prior to 1:00
p.m. (New York City time) on a Business Day, insert the date of the Notice of Borrowing. If a Notice of Borrowing will be delivered after 1:00 p.m. (New York City time) on a Business Day or on a day that is not a Business Day, insert the first
Business Day after the date of the Notice of Borrowing. 

  
 ANNEX VII 

Page 1 

 [Revolving Credit Agreement (2018-1B)] 

 

 The Borrower hereby acknowledges that, pursuant to the Liquidity Agreement, (A) the
making of the Special Termination Advance as requested by this Notice of Borrowing shall automatically and irrevocably terminate the obligation of the Liquidity Provider to make further Advances under the Liquidity Agreement; and (B) following
the making by the Liquidity Provider of the Special Termination Advance requested by this Notice of Borrowing, the Borrower shall not be entitled to request any further Advances under the Liquidity Agreement. 

  
 ANNEX VII 

Page 2 

 [Revolving Credit Agreement (2018-1B)] 

 

 IN WITNESS WHEREOF, the Borrower has executed and delivered this Notice of Borrowing
as of the      day of             ,     . 

 

			
	WILMINGTON TRUST, NATIONAL ASSOCIATION, not in its individual capacity but solely as Subordination Agent, as Borrower

 
			
		
	By:	 	
             

 
			
		 	Name:
		 	Title:

  
 ANNEX VII 

Page 3 

 [Revolving Credit Agreement (2018-1B)] 

 

 SCHEDULE I 

TO 
 SPECIAL TERMINATION
ADVANCE NOTICE OF BORROWING 
 [Insert copy of computations in accordance with Special Termination Advance Notice of Borrowing] 

  
 ANNEX VII 

Page 4 

 [Revolving Credit Agreement (2018-1B)] 

 

 ANNEX VIII 

TO 
 REVOLVING CREDIT
AGREEMENT 
 NOTICE OF SPECIAL TERMINATION 

[Date] 
 Wilmington Trust, National Association,

 as Subordination Agent, as Borrower 
 1100 North Market
Square 
 Wilmington, DE 19890-1605 
 Attention: Corporate
Trust Administration 
 Revolving Credit Agreement dated as of May 23, 2018 between Wilmington Trust, National Association, as
Subordination Agent, as agent and trustee for the United Airlines Pass Through Trust, 2018-1B, as Borrower, and National Australia Bank Limited, acting through its New York Branch (the “Liquidity
Agreement”) 
 Ladies and Gentlemen: 

You are hereby notified that pursuant to Section 6.02 of the Liquidity Agreement, by reason of the aggregate Pool Balance of the
Class B Certificates exceeding the aggregate outstanding principal amount of the Series B Equipment Notes (other than any Series B Equipment Notes previously sold or with respect to which the collateral securing such Series B Equipment Notes
has been disposed of) during the 18 month period prior to March 1, 2026, we are giving this notice to you in order to cause (i) our obligations to make Advances under the Liquidity Agreement to terminate on the fifth Business Day after the
date on which you receive this notice and (ii) you to request a Special Termination Advance under the Liquidity Agreement pursuant to Section 3.5(m) of the Intercreditor Agreement as a consequence of your receipt of this notice. Terms used
but not defined herein shall have the respective meanings ascribed thereto in or pursuant to the Liquidity Agreement. 

  
 ANNEX VIII 

Page 1 

 [Revolving Credit Agreement (2018-1B)] 

 

 THIS NOTICE IS THE “NOTICE OF SPECIAL TERMINATION” PROVIDED FOR UNDER THE LIQUIDITY
AGREEMENT. OUR OBLIGATIONS TO MAKE ADVANCES UNDER THE LIQUIDITY AGREEMENT WILL TERMINATE ON THE FIFTH BUSINESS DAY AFTER THE DATE ON WHICH YOU RECEIVE THIS NOTICE. 

 

			
	Very truly yours,
	
	NATIONAL AUSTRALIA BANK LIMITED, ACTING THROUGH ITS NEW YORK BRANCH, as Liquidity Provider
		
	By:	 	
                 

		 	Name:
		 	Title:
		
	By:	 	
                     

		 	Name:
		 	Title:

  

	cc:	Wilmington Trust, National Association, 

 as Class B Trustee 

  
 ANNEX VIII 

Page 2

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