Document:

EX-10.1

 Exhibit 10.1 

TENDER AND SUPPORT AGREEMENT 

THIS TENDER AND SUPPORT AGREEMENT (this
“Agreement”) is entered into as of [•], 2021, by and among Horizon Therapeutics USA, Inc., a Delaware corporation (“Parent”), Teiripic Merger Sub, Inc., a Delaware corporation and a direct
wholly-owned subsidiary of Parent (“Purchaser”), and [                    ] (“Stockholder”).

 RECITALS 

A. Stockholder is a holder of record and the “beneficial owner” (within the meaning of Rule
13d-3 under the Securities Exchange Act of 1934, as amended (the “Exchange Act”)) of certain shares of common stock of Viela Bio, Inc., a Delaware corporation (the
“Company”). 
 B. Parent, Purchaser and the Company are entering into an Agreement and Plan of Merger of even
date herewith (the “Merger Agreement”) which provides, among other things, for Purchaser to commence a cash tender offer (the “Offer”) to acquire all of the outstanding shares of common stock, par
value $0.001 per share, of the Company (the “Company Shares”) and following the consummation of the Offer, the merger of Purchaser with and into the Company, with the Company continuing as the surviving corporation and as an
indirect wholly owned subsidiary of Parent (the “Merger”), upon the terms and subject to the conditions set forth in the Merger Agreement. 

C. As a condition to the willingness of Parent and Purchaser to enter into the Merger Agreement and as an inducement in consideration
therefor, Stockholder has agreed to enter into this Agreement and tender and vote Stockholder’s Subject Securities (as defined below) as described herein and certain other stockholders of the Company (the “Supporting
Stockholders”) are also entering into tender and support agreements with the Parent and Purchaser (the “Other Tender and Support Agreements”). 

AGREEMENT 
 The parties to
this Agreement, intending to be legally bound, agree as follows: 
 SECTION 1. CERTAIN DEFINITIONS 

For purposes of this Agreement: 

(a) Capitalized terms used herein that are not defined shall have the respective meanings assigned to those terms in the Merger Agreement. 

(b) “Contract” means any note, bond, mortgage, indenture, lease, license, permit, contract, commitment, arrangement,
understanding, agreement or other instrument or obligations of any kind, including, any voting agreement, proxy arrangement, pledge agreement, stockholder agreement or voting trust, to which Stockholder is a party or by which the Subject Securities
are bound. 

 (c) “Covered Company Common Stock” means the total number of Company
Shares outstanding as of the record date (as determined pursuant to the Merger Agreement) multiplied by 0.45. 
 (d)
“Expiration Date” means the earliest to occur, without any notice or other action by any Person, of (a) the valid termination of the Merger Agreement in accordance with its
terms, (b) the Effective Time, (c) the entry without the prior written consent of Stockholder into any amendment or modification to the Merger Agreement or any waiver of any of the Company’s rights under the Merger Agreement, in each
case, that results in a decrease in, or a change in the form of, the Offer Price, (d) the termination or withdrawal of the Offer by Parent or Purchaser, or (e) the expiration of the Offer without Purchaser having accepted for payment the
Company Shares tendered in the Offer. 
 (e) “Lien” means any lien, pledge,
hypothecation, security interest, option, right of first refusal, proxy, voting trust or agreement, or other similar encumbrance on the Subject Securities (other than (i) as created by this Agreement, or (ii) restrictions on transfer under
the Securities Act of 1933, as amended). 
 (f) Stockholder is deemed to “Own” or to have acquired
“Ownership” of a security if Stockholder: (i) is the record owner of such security; or (ii) is the “beneficial owner” (within the meaning of Rule 13d-3 under the
Exchange Act) of such security. 
 (g) “Pro Rata Share” shall mean the quotient of (A) the number of Subject
Securities, divided by (B) the sum of (1) the number of Subject Securities, plus (2) the number of Subject Securities (as such term is defined in each of the Other Tender and Support Agreements) held by all of the Supporting
Stockholders, in the aggregate. 
 (h) “Subject Securities” mean: (i) all Company Shares Owned by Stockholder as
of the date of this Agreement and (ii) all additional Company Shares of which Stockholder acquires Ownership during the Support Period. 

(i) “Support Period” means the period commencing on (and including) the date of this Agreement and ending on (and
including) the Expiration Date. 
 (j) A Person is deemed to have effected a “Transfer”
of a security if such Person directly or indirectly: (i) sells, pledges, gifts, hedges, encumbers, grants a Lien on or an option with respect to, enters into any derivative arrangement with respect thereto, transfers or disposes of such
security or any interest in such security or right therein to any Person other than Parent or Purchaser; (ii) enters into an agreement or commitment contemplating the possible sale of, pledge of, gift, hedge, encumbrance or Lien of, grant of an
option with respect to, a derivative arrangement, transfer of or disposition of such security or any interest or right therein to any Person other than Parent or Purchaser; or (iii) reduces such Person’s beneficial ownership of or interest
in or risk relating to such security or enters into a derivative arrangement with respect to such security. 

  
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 SECTION 2. TRANSFER OF SUBJECT SECURITIES AND VOTING RIGHTS 

2.1 Restriction on Transfer of Subject Securities. Subject to Section 2.3 below, during the Support Period,
Stockholder shall not cause or permit any Transfer of any of the Subject Securities to be effected. Without limiting the generality of the foregoing, during the Support Period, Stockholder shall not tender, agree to tender or permit to be tendered
any of the Subject Securities in response to or otherwise in connection with any tender or exchange offer other than the Offer. 
 2.2
Restriction on Transfer of Voting Rights. During the Support Period, Stockholder shall ensure that: (a) none of the Subject Securities is deposited or otherwise transferred into a voting trust; (b) no proxy, power-of-attorney, consent right or other authorization is granted, and no voting agreement or similar agreement is entered into, with respect to any of the Subject Securities
other than as set forth in this Agreement; and (c) no action is taken or permitted that would in any material way restrict, limit or interfere with the performance of Stockholder’s obligations hereunder or otherwise make any representation
or warranty of Stockholder herein untrue or incorrect in any material respect. 
 2.3 Permitted Transfers.
Section 2.1 above shall not prohibit or otherwise restrict a Transfer of Subject Securities by Stockholder: (a) if Stockholder is an individual (i) to any member of Stockholder’s immediate family, or to a
trust for the benefit of Stockholder or any member of Stockholder’s immediate family, or otherwise for estate planning purposes, or (ii) by will or under the laws of intestacy upon the death of Stockholder; (b) if Stockholder is a
limited partnership or limited liability company, to a partner, member or equity holder of Stockholder; (c) if Stockholder is a corporation, to an affiliate that controls, is controlled by or is under common control with Stockholder; or
(d) by operation of law or to a charitable organization qualified under Section 501(c)(3) of the Code; provided, however, that a Transfer referred to in clauses “(a)” through “(d)” of this sentence
shall be permitted only if (A) all of the representations and warranties in Section 6 of this Agreement with respect to Stockholder would be true and correct in all material respects upon such Transfer, subject to
necessary adjustment as a result of such Transfer, (B) as a precondition to such Transfer, the transferee agrees in a written document, reasonably satisfactory in form and substance to Parent, to be bound by all of the terms of this Agreement,
and (C) such transfer occurs no later than three (3) Business Days prior to the Expiration Date. 
 SECTION 3. TENDER OF SUBJECT SECURITIES

 3.1 Tender of Subject Securities. 

(a) Until the Expiration Date, Stockholder hereby agrees, subject to Section 3.3, to tender the Subject Securities
(collectively, the “Tender Shares”) free and clear of all Liens, or cause such Stockholder’s Tender Shares to be tendered, into the Offer no later than the tenth (10th) Business Day following the commencement of the Offer. If Stockholder acquires Tender Shares after the date hereof and during the Support Period, Stockholder shall tender or cause to be tendered
such Tender Shares on or before the earlier of (a) five (5) Business Days after such acquisition, and (b) one (1) Business Day prior to the Expiration Date. Until the Expiration Date, once any of Stockholder’s Tender Shares are
tendered in accordance with the terms hereof, 

  
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Stockholder will not withdraw the Tender Shares, or cause the Tender Shares to be withdrawn, from the Offer at any time. Stockholder shall notify Parent as promptly as reasonably practicable in
writing of the number of any additional shares of Company Shares of which such Stockholder acquires beneficial or record ownership on or after the date hereof. 

(b) Notwithstanding Section 3.1(a) and Section 4.1, if at any time following the date
hereof and until the Expiration Date there occurs a Company Adverse Change Recommendation pursuant to Section 6.1(b) of the Merger Agreement (a “Change of Recommendation Event”), then the obligations
of the Stockholder under Section 3.1(a) and Section 4.1, shall be limited to the number of Subject Securities, rounded down to the nearest whole share, equal to the product of
(a) such Stockholder’s Pro Rata Share multiplied by (b) the Covered Company Common Stock; provided that all other obligations and restrictions contained in this Agreement shall continue to apply to all of the Subject
Securities. 
 3.2 Return of Subject Securities. If (a) the Offer is terminated or withdrawn by Parent or
Purchaser, or (b) the Expiration Date occurs prior to the purchase of the Subject Securities in the Offer, Parent and Purchaser shall promptly return, or cause any depository acting on behalf of Parent and Purchaser to return, all Subject
Securities tendered by Stockholder in the Offer to Stockholder. 
 3.3 No Requirement to Exercise. Notwithstanding
anything in this Agreement to the contrary, nothing herein shall require Stockholder to exercise any equity award or warrant or require any Stockholder to purchase any Company Shares, and nothing herein shall prohibit any Stockholder from exercising
any equity award or warrant held by such Stockholder.
 SECTION 4. VOTING OF COMPANY SHARES 

4.1 Voting Covenant. During the Support Period, Stockholder hereby irrevocably and unconditionally agrees that, at any annual or special
meeting of the stockholders of the Company, however called, including any adjournment or postponement thereof, and in connection with any action proposed to be taken by written consent of the stockholders of the Company, such Stockholder shall, in
each case to the fullest extent that such Stockholder’s Subject Securities are entitled to vote thereon: (a) appear at each such meeting or otherwise cause all such Subject Securities to be counted as present thereat for purposes of
determining a quorum; and (b) be present (in person or by proxy) and vote (or cause to be voted), or deliver (or cause to be delivered) a written consent with respect to, all of its Subject Securities, and unless otherwise directed in writing
by Parent: 
 (a) in favor of (i) the Merger, the execution and delivery by the Company of the Merger Agreement and the adoption and
approval of the Merger Agreement and the terms thereof, and (ii) each of the other Transactions; 
 (b) against any action or agreement
that, to the knowledge of such Stockholder, would reasonably be expected to result in any of the conditions set forth in Section 7 or Annex I of the Merger Agreement not being satisfied on or before the End Date; and 

(c) against the following actions (other than the Merger and the other Transactions): (i) any Acquisition Proposal (provided, that for
the purposes of this clause all references to 

  
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“20%” in the definition of Acquisition Transaction shall be deemed to be references to “50% plus one”); (ii) any amendment to the Company’s certificate of incorporation
or bylaws; (iii) any material change in the capitalization of the Company or the Company’s corporate structure; (iv) any sale, lease, license or transfer of a material amount of assets (including, for the avoidance of doubt,
intellectual property rights) of the Company or any reorganization, recapitalization or liquidation of the Company, (v) any change in a majority of the board of directors of the Company; and (vi) any other action which is, to the knowledge
of such Stockholder, intended or would reasonably be expected to impede, interfere with, delay, prevent or adversely affect the Merger or any of the other Transactions or this Agreement. 

During the Support Period, Stockholder shall not enter into any agreement or understanding with any Person to vote or give instructions in a manner
inconsistent with clauses “(a)”, “(b)” or “(c)” of this Section 4.1. 
 4.2 No
Other Agreement. 
 (a) Stockholder shall not enter into any tender, voting or other such agreement, or grant a proxy or power of
attorney, with respect to any of the Subject Securities that is inconsistent with this Agreement or otherwise take any other action with respect to any of the Subject Securities that would restrict, limit or interfere with the performance of any of
Stockholder’s obligations hereunder. 
 SECTION 5. WAIVER OF APPRAISAL RIGHTS 

5.1 During the term of this Agreement, Stockholder hereby irrevocably and unconditionally waives, and agrees not to exercise or assert,
on its own behalf or on behalf of any other holder of Company Shares, any rights of appraisal, any dissenters’ rights or any similar rights relating to the Merger that Stockholder may have by virtue of, or with respect to, any Subject
Securities Owned by Stockholder. 
 SECTION 6. REPRESENTATIONS AND WARRANTIES OF STOCKHOLDER 

Stockholder hereby represents and warrants to each of Parent and Purchaser as follows: 

6.1 Authorization, etc. Stockholder has the authority and legal capacity to execute and deliver this Agreement and to perform
Stockholder’s obligations hereunder. This Agreement has been duly authorized, executed and delivered by Stockholder and, assuming due authorization, execution and delivery by Parent and Purchaser, constitutes a legal, valid and binding
obligation of Stockholder, enforceable against Stockholder in accordance with its terms, except as enforcement thereof may be limited by (i) bankruptcy, insolvency, reorganization, moratorium and similar Laws affecting the enforcement of
creditors’ rights or remedies in general as from time to time in effect or (ii) the exercise by courts of equity powers. If Stockholder is a corporation, then Stockholder is a corporation duly organized, validly existing and in good
standing under the laws of the jurisdiction in which it was organized. If Stockholder is a general or limited partnership, then Stockholder is a partnership duly organized, validly existing and in good standing under the laws of the jurisdiction in
which it was organized. If Stockholder is married, and any of the Subject Shares of Stockholder constitute community property or otherwise need spousal or other approval for this Agreement to be legal, valid and

  
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binding, this Agreement has been duly executed and delivered by Stockholder’s spouse and, assuming due authorization, execution and delivery by Parent and Purchaser, is enforceable against
Stockholder’s spouse in accordance with its terms, except as enforcement thereof may be limited by (i) bankruptcy, insolvency, reorganization, moratorium and similar Laws affecting the enforcement of creditors’ rights or remedies in
general as from time to time in effect or (ii) the exercise by courts of equity powers. 
 6.2 No Conflicts or Consents. 

(a) The execution and delivery of this Agreement by Stockholder does not, and the performance of this Agreement by Stockholder will not:
(a) assuming the Company’s, Parent’s and Merger Sub’s compliance with all applicable antitrust and competition laws, conflict with or violate any law, rule, regulation, order, decree or judgment applicable to Stockholder or by
which Stockholder or any of Stockholder’s Subject Securities is or may be bound; (b) if Stockholder is not an individual, violate, contravene or conflict with or result in any breach of any provision of the certificate of incorporation or
bylaws (or other similar governing documents) of Stockholder; or (c) result in or constitute (with or without notice or lapse of time) any material breach of or material default under, or give to any other Person (with or without notice or
lapse of time) any right of termination, amendment, acceleration or cancellation of, or result (with or without notice or lapse of time) in the creation of any Lien on any of the Subject Securities pursuant to, any material Contract to which
Stockholder is a party or by which Stockholder or any of Stockholder’s Affiliates or Subject Securities is or may be bound or affected, except, in each case, for any conflict, violation, breach, default or right which would not adversely affect
in any material respect the ability of Stockholder to perform its obligations hereunder. 
 (b) The execution and delivery of this Agreement
by Stockholder do not, and the performance of this Agreement by Stockholder will not, require any filing with or notification of, nor any permit, authorization, consent or approval of, any Person, other than as required under the United States
Securities Act of 1933, as amended (the “Securities Act”), the Exchange Act, other similar securities laws and the rules and regulations promulgated thereunder or where the failure to make such filings or obtain such permits,
authorizations, consents or approvals would not, individually or in the aggregate, prevent or materially delay the performance by Stockholder of any of its obligations under this Agreement. Assuming the Company’s, Parent’s and Merger
Sub’s compliance with all applicable antitrust and competition laws, no consent or notification of, or registration, declaration or filing with, any Governmental Entity is required to be obtained or made by or with respect to Stockholder in
connection with the execution, delivery or performance of this Agreement or the consummation of the transactions contemplated hereby, other than (m) as required under the Securities Act, the Exchange Act, other similar securities laws and the
rules and regulations promulgated thereunder and (n) as would not, individually or in the aggregate, prevent or materially delay the performance by Stockholder of any of its obligations under this Agreement. 

6.3 Title to Company Shares. Stockholder (a) owns, free and clear of any Lien (other than (i) Liens that are or may be
imposed pursuant to this Agreement, and (ii) Liens that would not adversely affect in any material respect the ability of Stockholder to perform Stockholder’s obligations hereunder), the Subject Securities set forth opposite such

  
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Stockholder’s name on Exhibit A to this Agreement, and (b) except as set forth in Exhibit A hereto, does not hold or have any ownership interest in any other Company
Shares or any performance based stock awards, restricted stock, options (including any granted pursuant to any Company Equity Plan) or warrants to acquire Company Shares, or other rights or securities convertible into or exercisable or exchangeable
for Company Shares. 
 6.4 Legal Proceedings. As of the date of this Agreement, there is no Action pending or, to the knowledge of
Stockholder, threatened against Stockholder that would reasonably be expected to impair in any material respect the ability of Stockholder to perform Stockholder’s obligations hereunder. 

6.5 Voting Power. Stockholder has full voting power with respect to all such Stockholder’s Subject Securities, and full power of
disposition, full power to issue instructions with respect to the matters set forth herein and full power to agree to all of the matters set forth in this Agreement, in each case with respect to all such Stockholder’s Subject Securities. None
of such Stockholder’s Subject Securities are subject to any stockholders’ agreement, proxy, voting trust or other agreement or arrangement with respect to the voting of such Subject Securities, except as provided hereunder. 

6.6 Reliance. Stockholder understands and acknowledges that Parent and Purchaser are entering into the Merger Agreement in reliance upon
such Stockholder’s execution, delivery and performance of this Agreement. 
 SECTION 7. REPRESENTATIONS AND WARRANTIES OF PARENT AND PURCHASER

 Each of Parent and Purchaser hereby, jointly and severally, represents and warrants to Stockholder as follows: 

7.1 Authorization, etc. Each of Parent and Purchaser has all necessary corporate power and authority to execute and deliver this
Agreement and to perform its obligations hereunder. This Agreement has been duly authorized, executed and delivered by each of Parent and Purchaser and, assuming due authorization, execution and delivery by Stockholder, constitutes a legal, valid
and binding obligation of Parent and Purchaser, enforceable against Parent and Purchaser in accordance with their terms, subject to (a) laws of general application relating to bankruptcy, insolvency, reorganization, moratorium, fraudulent
conveyance and other laws affecting enforcement of creditors’ rights generally, and (b) rules of law governing specific performance, injunctive relief and other equitable remedies. Each of Parent and Purchaser is a corporation duly
organized, validly existing and in good standing under the laws of the jurisdiction in which it was organized. 
 7.2 No
Conflicts or Consents. The execution and delivery of this Agreement by Parent and Purchaser does not, and the performance of this Agreement by Parent and Purchaser and their respective Representatives will not: (a) conflict with or violate
any law, rule, regulation, order, decree or judgment applicable to Parent and Purchaser (or any of such Representatives) or by which Parent or Purchaser (or any of such Representatives) or any of their respective properties is or may be bound; or
(b) require any filing with, nor any permit, 

  
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authorization, consent or approval of, any Person or require any consent of, or registration, declaration or filing with, any Governmental Entity, other than (i) any applicable requirements
of the Exchange Act, Nasdaq, and the DGCL, (ii) as required by Antitrust Laws, (iii) as contemplated by the Merger Agreement (including schedules thereto), and (iv) where the failure to obtain such consents or approvals or to make
such filings, would not, individually or in the aggregate, prevent or materially delay the performance by Parent or Purchaser of their obligations under this Agreement. 

SECTION 8. COVENANTS OF STOCKHOLDER 

8.1 Stockholder Information. Stockholder hereby agrees to permit Parent and Purchaser to publish and disclose in the Offer Documents
Stockholder’s identity and ownership of the Subject Securities and the nature of Stockholder’s commitments, arrangements and understandings under this Agreement. 

8.2 Further Assurances. From time to time and without additional consideration, Stockholder shall (at Parent’s sole expense)
execute and deliver, or cause to be executed and delivered, such additional transfers, assignments, endorsements, consents and other instruments, and shall (at Parent’s sole expense) use commercially reasonable efforts to take such further
actions, as Parent may reasonably request for the purpose of carrying out and furthering the intent of this Agreement. 
 8.3 Stop
Transfer Order; Legends. Stockholder hereby agrees that it will not request that the Company register the Transfer of any certificate or uncertificated interest representing any of the Subject Securities, unless such Transfer is made in
compliance with this Agreement. In furtherance of this Agreement, concurrently herewith, Stockholder shall, and hereby does authorize the Company or its counsel to, notify the Company’s transfer agent that there is a stop transfer order with
respect to all of the Subject Securities (and that this Agreement places limits on the voting and transfer of such shares). The parties hereto agree that such stop transfer order shall be removed and shall be of no further force and effect upon the
Expiration Date. 
 8.4 No Solicitation. During the Support Period, subject to the last sentence of this
Section 8.4, Stockholder shall not, and shall cause its controlled Affiliates and shall use reasonable best efforts to cause the Representatives of the Stockholder and Representatives of its controlled Affiliates acting on the
Stockholder’s behalf not to (and not publicly propose to), directly or indirectly, (a) solicit, initiate, knowingly facilitate or knowingly encourage the submission, making or announcement of any inquiries, indications of interest,
proposals or offers that constitute or could reasonably be expected to lead to any Acquisition Proposal, (b) provide any non-public information concerning the Company or Stockholders’ agreements with
or interest in the Company, or engage or otherwise participate in any discussions or negotiations with respect to any Acquisition Proposal or any proposal, offer or requests that could reasonably be expected to lead to an Acquisition Proposal, to
any Person or group who has made or could reasonably be expected to make any Acquisition Proposal, or for the purpose of soliciting, initiating, knowingly facilitating or knowingly encouraging any Acquisition Proposal or any proposal, offer or
requests that could reasonably be expected to lead to an Acquisition Proposal, (c) otherwise cooperate with or assist or participate in, or facilitate, any such inquiries, proposals, 

  
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offers, discussions or negotiations, (d) enter into any letter of intent, term sheet, acquisition agreement, agreement in principle or similar agreement with respect to any Acquisition
Proposal or that could reasonably be expected to lead to an Acquisition Proposal, or (e) resolve, publicly propose or agree to do any of the foregoing. Stockholder shall, and shall cause its controlled Affiliates and shall use reasonable best
efforts to cause the Representatives of the Stockholder and its controlled Affiliates acting on the Stockholder’s behalf to, immediately cease and cause to be terminated any solicitation, encouragement, discussion, activities or negotiation
with any Person or groups that may be ongoing with respect to any Acquisition Proposal or an inquiries, proposals, offers or requests with respect to or that could reasonably be expected to lead to an Acquisition Proposal. Notwithstanding anything
to the contrary provided in this Agreement, Stockholder and its Affiliates shall not be prohibited from (i) engaging in any discussions or negotiations with respect to a possible tender and support, voting or similar agreement in connection
with an Acquisition Proposal in the event that the Company is permitted to take the actions set forth in Section 5.4 of the Merger Agreement with respect to such Acquisition Proposal or (ii) in connection with the termination by the
Company of the Merger Agreement in accordance with its terms in order to enter into a Specified Agreement, entering into a tender and support, voting or similar agreement with the Person making the Superior Proposal. 

8.5 Public Announcement. Stockholder shall not, and shall use reasonable best efforts to cause its Representatives not to, issue
any press release or make any public statement with respect to the transactions contemplated by this Agreement or the Merger Agreement without the approval of Parent, except as may be required by the Securities Act, the Exchange Act and other
applicable Law; provided, that to the extent feasible, Stockholder shall notify Parent in advance of any public statement or disclosure it intends to make without Parent approval because disclosure is required by applicable Law. Stockholder
hereby (i) consents to and authorizes the publication and disclosure by Parent, Purchaser and the Company (including in the Schedule TO, the Schedule 14D-9 or any other publicly filed documents relating
to the Merger, the Offer or the Transactions) of: (a) Stockholder’s identity; (b) Stockholder’s ownership of the Subject Securities; and (c) the nature of Stockholder’s commitments, arrangements and understandings under
this Agreement, and any other information that Parent, Purchaser or the Company reasonably determines to be necessary in any SEC disclosure document in connection with the Offer, the Merger or the Transactions; and (ii) agrees as promptly as
reasonably practicable to give Parent any information described in clause (i) above and notify Parent, Purchaser and the Company of any required corrections with respect to any written information supplied by Stockholder specifically for use in
any such disclosure document, if and to the extent Stockholder becomes aware that any such information shall have become false or misleading in any material respect. 

8.6 Waiver of Certain Actions. Stockholder hereby agrees not to commence or participate in, and to take all actions necessary to opt out
of any class in any class action with respect to, any claim, derivative or otherwise, against Parent, Purchaser or any of their respective successors (a) challenging the validity of, or seeking to enjoin or delay the operation of, any provision
of this Agreement or the Merger Agreement (including any claim seeking to enjoin or delay the Expiration Date or the Closing) or (b) alleging a breach of any duty of the Board of Directors of the Company in connection with the Merger Agreement,
this Agreement or the transactions contemplated thereby or hereby. 

  
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 SECTION 9. MISCELLANEOUS 

9.1 Adjustments. In the event that, between the date of this Agreement and the Effective Time, (a) the number of issued and
outstanding Subject Securities or securities convertible or exchangeable into or exercisable for Subject Securities changes as a result of a reclassification, stock split (including a reverse stock split), stock dividend or distribution,
recapitalization, merger, issuer tender or exchange offer, or other similar transaction, or (b) Stockholder shall become the beneficial owner of any additional Company Shares, then the terms of this Agreement shall apply to the Company Shares
held by Stockholder immediately following the effectiveness of the events described in clause (a) or Stockholder becoming the beneficial owner thereof as described in clause (b), as though, in either case, they were Subject Securities
hereunder. In the event that Stockholder shall become the beneficial owner of any other securities entitling the holder thereof to vote or give consent with respect to the matters set forth in Section 4 hereof, then the
terms of Section 4 hereof shall apply to such other securities as though they were Subject Securities hereunder. 

9.2 Survival of Representations, Warranties and Agreements. All representations, warranties, covenants and agreements in this Agreement,
and all rights and remedies with respect thereto, shall not survive the Expiration Date. 
 9.3 Expenses. Except as provided in
Section 8.2 hereof, all costs and expenses incurred in connection with the transactions contemplated by this Agreement shall be paid by the party incurring such costs and expenses. 

9.4 Notices. All notices and other communications hereunder shall be in writing and shall be deemed to have been duly delivered and
received hereunder (a) one (1) Business Day after being sent for next Business Day delivery, fees prepaid, via a reputable international overnight courier service, (b) upon delivery in the case of delivery by hand, (c) if sent by
email transmission prior to 6:00 p.m. recipient’s local time, upon transmission (provided, no “bounce back” or similar message of non-delivery is received with respect thereto) or (d) if
sent by email transmission after 6:00 p.m. recipient’s local time and no “bounce back” or similar message of non-delivery is received with respect thereto, the Business Day following the date of
transmission; provided, that in each case the notice or other communication is sent to the physical address or email address set forth beneath the name of such party below (or to such other physical address or email address as such party
shall have specified in a written notice given to the other parties): 
 if to Stockholder: 

at the address set forth on the signature page hereof; 

and if to Parent or Purchaser (or following the Effective Time, the Company): 

1 Horizon Way 
 Deerfield, IL
60015 
 Attn: General Counsel 

Email: legal@horizontherapeutics.com 

with a copy to (which copy shall not constitute notice): 

  
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 Cooley LLP 

4401 Eastgate Mall 
 San Diego, CA
92121 
 Attn: Barbara L. Borden & Rama Padmanabhan 

Email: bborden@cooley.com & rama@cooley.com 

9.5 Severability. Any term or provision of this Agreement that is invalid or unenforceable in any situation in any jurisdiction shall
not affect the validity or enforceability of the remaining terms and provisions of this Agreement or the validity or enforceability of the offending term or provision in any other situation or in any other jurisdiction. If a final judgment of a
court of competent jurisdiction declares that any term or provision of this Agreement is invalid or unenforceable, the parties agree that the court making such determination shall have the power to limit such term or provision, to delete specific
words or phrases or to replace such term or provision with a term or provision that is valid and enforceable and that comes closest to expressing the intention of the invalid or unenforceable term or provision, and this Agreement shall be valid and
enforceable as so modified. In the event such court does not exercise the power granted to it in the prior sentence, the parties agree to replace such invalid or unenforceable term or provision with a valid and enforceable term or provision that
will achieve, to the extent possible, the economic, business and other purposes of such invalid or unenforceable term or provision. 
 9.6
Entire Agreement; Counterparts. This Agreement and any other documents delivered by the parties in connection herewith constitute the entire agreement and supersede all prior agreements and understandings, both written and oral, among or between
any of the parties, with respect to the subject matter hereof and thereof. This Agreement may be executed in several counterparts, each of which shall be deemed an original and all of which shall constitute one and the same instrument. The exchange
of a fully executed Agreement (in counterparts or otherwise) by PDF shall be sufficient to bind the parties to the terms and conditions of this Agreement. 

9.7 Assignment; Binding Effect. No party may assign (by merger, operation of Law or otherwise) either this Agreement or any of its
rights, interests, or obligations hereunder without the prior written approval of the other parties; provided, that each of Parent or Purchaser may assign, in its sole discretion, any or all of its rights, interests and obligations under this
Agreement to any one or more direct or indirect wholly owned Subsidiaries of Parent without the consent of Stockholder, but no such assignment shall relieve Parent or Purchaser, as applicable, of any of its obligations under this Agreement or
enlarge any obligation of the Stockholder hereunder. Any purported assignment in violation of this Agreement will be void ab initio. 

9.8 Independence of Obligations. The covenants and obligations of Stockholder set forth in this Agreement shall be construed as
independent of any other agreement or arrangement between Stockholder, on the one hand, and the Company or Parent, on the other. The existence of any claim or cause of action by Stockholder against the Company or Parent shall not constitute a
defense to the enforcement of any of such covenants or obligations against Stockholder. 
 9.9 Governing Law. 

  
 11 

 (a) This Agreement shall be governed by, and construed in accordance with, the laws of the
State of Delaware, regardless of the laws that might otherwise govern under applicable principles of conflicts of laws thereof. Subject to Section 9.9(c), in any action or proceeding arising out of or relating to this
Agreement or the transactions contemplated hereby: (i) each of the parties irrevocably and unconditionally consents and submits to the exclusive jurisdiction and venue of the Chancery Court of the State of Delaware and any state appellate court
therefrom or, if such court lacks subject matter jurisdiction, the United States District Court sitting in New Castle County in the State of Delaware, (it being agreed that the consents to jurisdiction and venue set forth in this
Section 9.9(a) shall not constitute general consents to service of process in the State of Delaware and shall have no effect for any purpose except as provided in this paragraph and shall not be deemed to confer rights on
any Person other than the parties); and (ii) each of the parties irrevocably consents to service of process by first class certified mail, return receipt requested, postage prepaid, to the address at which such Party is to receive notice in
accordance with Section 9.4. The parties agree that a final judgment in any such action or proceeding shall be conclusive and may be enforced in other jurisdictions by suit on the judgment or in any other manner provided by
applicable Laws; provided, however, that nothing in the foregoing shall restrict any party’s rights to seek any post-judgment relief regarding, or any appeal from, such final trial court judgment. 

(b) The parties agree that irreparable damage for which monetary damages, even if available, would not be an adequate remedy will occur in the
event that the parties do not perform their obligations under the provisions of this Agreement in accordance with its specified terms or otherwise breach such provisions. Subject to the following sentence, the parties acknowledge and agree that
(i) the parties shall be entitled to seek an injunction or injunctions, specific performance, or other equitable relief, to prevent breaches or threatened breaches of this Agreement and to enforce specifically the terms and provisions hereof in
the courts described in Section 9.9(a) without proof of damages or otherwise, this being in addition to any other remedy to which they are entitled under this Agreement, and (ii) the right of specific performance is an
integral part of the transactions contemplated hereby and without that right, neither the Company nor Parent would have entered into this Agreement. Each of the parties agrees that it will not oppose the granting of an injunction, specific
performance and other equitable relief on the basis that the other parties have an adequate remedy at law or an award of specific performance is not an appropriate remedy for any reason at law or equity. The Parties acknowledge and agree that any
party seeking an injunction or injunctions to prevent breaches or threatened breaches of this Agreement and to enforce specifically the terms and provisions of this Agreement in accordance with this Section 9.9(b) shall not
be required to provide any bond or other security in connection with any such order or injunction. 
 (c) EACH OF THE PARTIES HERETO
IRREVOCABLY WAIVES TO THE FULLEST EXTENT PERMISSIBLE UNDER THE LAW ANY AND ALL RIGHT TO TRIAL BY JURY IN ANY LEGAL PROCEEDING BETWEEN THE PARTIES HERETO ARISING OUT OF OR RELATING TO THIS AGREEMENT OR THE TRANSACTIONS CONTEMPLATED HEREBY. 

9.10 Waiver. No failure on the part of any party hereto to exercise any power, right, privilege or remedy under this Agreement,
and no delay on the part of such party in exercising any power, right, privilege or remedy under this Agreement, shall operate as a waiver of such 

  
 12 

 
power, right, privilege or remedy; and no single or partial exercise of any such power, right, privilege or remedy shall preclude any other or further exercise thereof or of any other power,
right, privilege or remedy. No party shall be deemed to have waived any claim arising out of this Agreement, or any power, right, privilege or remedy under this Agreement, unless the waiver of such claim, power, right, privilege or remedy is
expressly set forth in a written instrument duly executed and delivered on behalf of such party; and any such waiver shall not be applicable or have any effect except in the specific instance in which it is given. 

9.11 Termination. This Agreement and all rights and obligations of the parties hereunder shall automatically terminate, and no
party shall have any rights or obligations hereunder, and this Agreement shall be revoked and become null and void on, and have no further effect as of the Expiration Date. Nothing in this Section 9.11 shall relieve any
party from any liability for any Willful Breach of this Agreement occurring prior to the termination of this Agreement and the provisions of this Section 9 (other than Section 9.1) shall survive
any termination of this Agreement. 
 9.12 Directors and Officers. Stockholder signs this Agreement solely in such Stockholder’s
capacity as a stockholder of the Company, and not in such Stockholder’s capacity as a director, officer or employee of the Company. Nothing in this Agreement shall be construed to prohibit Stockholder or any of Stockholder’s
Representatives who is an officer or member of the board of directors of the Company from taking any action (or failure to act) in his or her capacity as an officer or member of the board of directors of the Company or from taking any action with
respect to any Acquisition Proposal solely in their capacity as such an officer or director or in the exercise of his or her fiduciary duties in his or her capacity as director or officer of the Company, or prevent or be construed to create any
obligation on the part of any director or officer of the Company from taking any action in his or her capacity as such director or officer, and no action taken solely in any such capacity as an officer or director of the Company shall be deemed to
constitute a breach of this Agreement. 
 9.13 Construction. 

(a) For purposes of this Agreement, whenever the context requires: the singular number shall include the plural, and vice versa; the masculine
gender shall include the feminine and neuter genders; the feminine gender shall include the masculine and neuter genders; and the neuter gender shall include masculine and feminine genders. 

(b) The parties agree that any rule of construction to the effect that ambiguities are to be resolved against the drafting party shall not be
applied in the construction or interpretation of this Agreement. 
 (c) As used in this Agreement, the words “include” and
“including,” and variations thereof, shall not be deemed to be terms of limitation, but rather shall be deemed to be followed by the words “without limitation.” The words “hereof”, “herein” and
“hereunder” and words of like import used in this Agreement, unless otherwise stated, shall refer to this Agreement as a whole and not to any particular provision of this Agreement. 

  
 13 

 (d) Unless otherwise indicated all references in this Agreement to “Sections” and
“Exhibits” are intended to refer to Sections of this Agreement and Exhibits to this Agreement, as applicable. 
 (e) The headings
set forth in this Agreement are for convenience of reference purposes only and shall not affect or be deemed to effect in any way the meaning or interpretation of this Agreement or any term or provision hereof. 

(f) References to “$” refer to United States dollars unless otherwise noted. 

9.14 No Ownership Interest. All rights, ownership and economic benefits of and relating to the Subject Securities Owned by Stockholder
at a given time shall remain vested in and belong to Stockholder as of such time, and neither Parent nor Purchaser shall have any authority to exercise any power or authority to direct Stockholder in the voting of any of the Subject Securities,
except as otherwise specifically provided herein. 
 9.15 No Agreement Until Executed. This Agreement shall not be effective
unless and until (i) the Merger Agreement is executed by all parties thereto and (ii) this Agreement is executed by all parties hereto. 

9.16 Amendments and Waivers. Any provision of this Agreement may be amended or waived if such amendment or waiver is in writing and is
signed, (i) in the case of an amendment, by each of (x) Parent and the Purchaser, on the one hand, and (y) Stockholder, on the other hand, or (ii) in the case of a waiver, by each party against whom such waiver is to be
effective. No failure or delay by any party in exercising any right, power or privilege hereunder shall operate as a waiver thereof, nor shall any single or partial exercise thereof preclude any other or further exercise thereof or the exercise of
any other right, power or privilege. 
 [Remainder of page intentionally left blank] 

  
 14 

 Each of Parent, Purchaser and Stockholder has caused this Agreement to be executed as of the
date first written above. 
  

	
	HORIZON THERAPEUTICS USA, INC.
	
	  
 By

	
	  
 Name

	
	  
 Title

	
	TEIRIPIC MERGER SUB, INC.
	
	  
 By

	
	  
 Name

	
	  
 Title

	
	STOCKHOLDER
	
	  
 Signature

	
	  
 Printed
Name

  

			
	Address: 	 	
                     
                

		
		 	  

		
		 	  

		
	Facsimile:	 	  

		 
		 	 Company Shares
Held of Record

  
 Signature Page to
Tender and Support Agreement 

 EXHIBIT A 

SUBJECT SECURITIESExhibit 4.1

 

TRUST SUPPLEMENT No. 2020-1B

 

Dated as of February 1, 2021

 

between

 

WILMINGTON TRUST, NATIONAL ASSOCIATION

as Trustee,

  

and

  

UNITED AIRLINES, INC.

 

to

 

PASS THROUGH TRUST AGREEMENT

Dated as of October 3, 2012

  

$600,000,000

 

United Airlines Pass Through Trust 2020-1B

4.875% United Airlines Pass Through Certificates,
Series 2020-1B

 

     

     

    

 

 

TABLE OF CONTENTS

 

Page

 

	ARTICLE I THE CERTIFICATES	2
	Section 1.01.	 The Certificates	2
	 	 	 
	ARTICLE II DEFINITIONS	4
	Section 2.01.	 Definitions	4
	 	 	 
	ARTICLE III DISTRIBUTIONS; STATEMENTS TO CERTIFICATEHOLDERS	8
	Section 3.01.	 Statements to Applicable Certificateholders	8
	Section 3.02.	 Special Payments Account	10
	Section 3.03.	 Distributions from Special Payments Account	10
	Section 3.04.	 Limitation of Liability for Payments	11
	 	 	 
	ARTICLE IV DEFAULT	11
	Section 4.01. 	Purchase Rights of Certificateholders	11
	Section 4.02. 	Amendment of Section 6.05 of the Basic Agreement	14
	 	 	 
	ARTICLE V THE TRUSTEE	14
	Section 5.01. 	Delivery of Documents; Delivery Dates	14
	Section 5.02. 	[Reserved]	15
	Section 5.03. 	The Trustee	15
	Section 5.04. 	Representations and Warranties of the Trustee	15
	Section 5.05. 	Trustee Liens	16
	 	 	 
	ARTICLE VI ADDITIONAL AMENDMENT; SUPPLEMENTAL AGREEMENTS	16
	Section 6.01. 	Amendment of Section 5.02 of the Basic Agreement	16
	Section 6.02.	 Supplemental Agreements Without Consent of Applicable
Certificateholders	16
	Section 6.03. 	Supplemental Agreements with Consent of Applicable Certificateholders	17
	Section 6.04.	 Consent of Holders of Certificates Issued under Other
Trusts	17
	 	 	 
	ARTICLE VII TERMINATION OF TRUST	18
	Section 7.01.	 Termination of the Applicable Trust	18
	 	 	 
	ARTICLE VIII MISCELLANEOUS PROVISIONS	18
	Section 8.01.	 Basic Agreement Ratified	18
	Section 8.02.	 Governing Law	19
	Section 8.03. 	Execution in Counterparts	19
	Section 8.04. 	Intention of Parties	19

 

Exhibit A        -        Form of Certificate

Exhibit B        -        DTC Letter
of Representations

 

     

    1

    

  

This Trust Supplement
No. 2020-1B, dated as of February 1, 2021 (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 the Collateral, comprised of the Aircraft Collateral, the Spare Engine Collateral and the Spare Parts Collateral;

 

WHEREAS, the Company
has issued, pursuant to the Indenture, on a recourse basis, the Series A Equipment Note on October 28, 2020, and will issue, pursuant
to the Indenture, on a recourse basis, the Series B Equipment Note, and may issue one or more series of Additional Equipment Notes
and/or one or more series of Refinancing Equipment Notes;

 

WHEREAS, the Series B
Equipment Note will initially be secured by the Collateral;

 

WHEREAS, the Trustee
hereby declares the creation of the United Airlines Pass Through Trust 2020-1B (the “Applicable Trust”) for
the benefit of the Applicable Certificateholders, and the initial Applicable Certificateholders as the grantors of the Applicable
Trust, by their respective acceptances of the Applicable Certificates (as defined below), join in the creation of the Applicable
Trust with the Trustee;

 

WHEREAS, all Certificates
to be 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;

 

WHEREAS, pursuant to
the terms and conditions of the Basic Agreement as supplemented by this Trust Supplement (the “Agreement”) and
the NPA, on the date hereof, the Trustee on behalf of the Applicable Trust, using funds obtained from the sale of the Applicable
Certificates, shall purchase a Series B Equipment Note having the same interest rate as, and final maturity date not later than
the final Regular Distribution Date of, the Applicable Certificates issued hereunder and shall hold such Series B Equipment Note
in trust for the benefit of the Applicable Certificateholders;

 

WHEREAS, 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 

 

     

    2

    

 

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. There is hereby created a series of Certificates to be issued under the Agreement to be distinguished and known
as “United Airlines Pass Through Certificates, Series 2020-1B” (hereinafter defined as the “Applicable Certificates”).
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 authenticated under the Agreement (except for Applicable Certificates
authenticated and delivered under Sections 3.03, 3.04, 3.05 and 3.06 of the Basic Agreement) is $600,000,000.

 

(b)       The
Regular Distribution Dates with respect to any distribution of Scheduled Payments on the Applicable Certificates means January
15, April 15, July 15 and October 15 of each year, commencing on April 15, 2021 until distribution of all of the Scheduled Payments
to be made under the Series B Equipment Note 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)       [Reserved].

 

(e)       (i)       The
Applicable Certificates shall be in the form attached hereto as Exhibit A. 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 

 

     

    3

    

 

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 hereto as Exhibit B.

 

(f)       If
the purchaser or transferee of an Applicable Certificate or an interest therein is an employee benefit plan subject to Title I
of ERISA or a plan subject to Section 4975 of the Code, it will be deemed to represent, warrant and agree that (i) none of United
Airlines Holdings, Inc., the Company, or the Underwriters, nor any of their affiliates, has provided any investment recommendation
or investment advice on which it, or any fiduciary or other person investing the assets of such plan (“Plan Fiduciary”),
has relied in connection with its decision to invest in the Applicable Certificates, and they are not otherwise acting as a fiduciary,
as defined in Section 3(21) of ERISA or Section 4975(e)(3) of the Code, to such plan or the Plan Fiduciary in connection with such
plan’s acquisition of the Applicable Certificates; and (ii) the Plan Fiduciary is exercising its own independent judgment
in evaluating the transaction.

 

(g)       The
 “NPA” as defined in this Trust Supplement is the “Note Purchase Agreements” referred to in the Basic Agreement.

 

(h)       The
Applicable Certificates are subject to the Intercreditor Agreement.

 

(i)       The
Applicable Certificates are entitled to the benefits of the Liquidity Facilities.

 

(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)       [Reserved].

 

(m)      The
Series B Equipment Note to be acquired and held in the Applicable Trust, and the related Collateral 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:   
Has the meaning specified in the recitals hereto.

 

Aircraft
Collateral:    Means, at any given time, each of the aircraft that is owned by the Company and secures the Series B Equipment
Note pursuant to the Security Documents.

 

Applicable
Certificate:    Has the meaning specified in Section 1.01 of this Trust Supplement.

 

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.

 

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

 

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 the Loan Trustee maintains its Corporate Trust Office or receives and disburses funds.

 

Certificate:
    Has the meaning specified in the Intercreditor Agreement.

 

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 the Indenture and other Security Documents or, if it has entered into such agreements,
has at any time thereafter failed to cure any default under the Indenture or any of the other Security Documents 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 Collateral.

 

Class:   
Has the meaning specified in the Intercreditor Agreement.

 

     

    5

    

 

Collateral:
    Means, collectively, the Aircraft Collateral, the Spare Engine Collateral and the Spare Parts Collateral.

 

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

 

Controlling
Party:    Has the meaning specified in the Intercreditor 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.

 

Final
Maturity Date:    Means July 15, 2027.

 

Indenture:
Means the trust indenture and mortgage dated as of October 28, 2020 between the Company, as owner, and the Loan Trustee, as amended
pursuant to the Indenture Amendment, pursuant to which the Series B Equipment Note has been issued, as the same may be amended,
supplemented or otherwise modified from time to time in accordance with its terms.

 

Indenture
Amendment:    Means amendment no. 1 to the Indenture, 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 Trustee, the Other
Trustee party thereto, the Liquidity Providers, the liquidity providers relating to 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.

 

Issuance
Date:    Means February 1, 2021.

 

Liquidity
Facility: Means, initially, each Revolving Credit Agreement dated as of the date hereof relating to the Applicable Certificates,
between a 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, any replacement liquidity
facility therefor, in each case as amended, supplemented or otherwise modified from time to time in accordance with their respective
terms.

 

     

    6

    

 

Liquidity
Provider:    Means, with respect to the Applicable Certificates, initially, each of Goldman Sachs Bank USA, Citibank, NA and Credit
Suisse AG, New York Branch, and any replacements or successors therefor appointed in accordance with the Intercreditor Agreement.

 

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

 

Note Documents:   
Means the Series B Equipment Note with respect to the Applicable Certificates, the NPA and the Security Documents.

 

NPA:
    Means the Note Purchase Agreement, dated as of the date hereof, among the Trustee, the Other Trustee party thereto, the Loan Trustee,
the Company and the Subordination Agent, 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.

 

Other
Agreements:    Means (i) the Basic Agreement, as supplemented by Trust Supplement No. 2020-1A dated October 28, 2020 relating
to United Airlines Pass Through Trust 2020-1A, (ii) the Basic Agreement, as supplemented by a Trust Supplement relating to any
Additional Trust and (iii) 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.

 

Other
Trusts:    Means the United Airlines Pass Through Trust 2020-1A, an Additional Trust or Trusts, if any, and a Refinancing Trust
or Trusts, if any, created by the Other Agreements.

 

Pool Balance:   
Means, as of any date, (i) the original aggregate face amount of the Applicable Certificates, less (ii) the aggregate amount of
all payments made as of such date in respect of such Applicable Certificates, 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 payment of principal of the Series B Equipment Note or payment
with respect to other Trust Property and the distribution thereof to be made on that date.

 

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. The Pool Factor as of any Distribution Date shall be
computed after giving effect to any special distribution with respect to any payment of principal of the Series B Equipment Note
or payment with respect to other Trust Property and the distribution thereof to be made on that date.

 

     

    7

    

 

Scheduled
Payment:    Means, with respect to the 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 any 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 the purchase (in whole or in part) of the Series B Equipment Note
shall not constitute a Scheduled Payment.

 

Series
B Equipment Note:   Means the Series B Equipment Note issued under the Indenture.

 

Security
Documents:    Means (i) the spare parts security agreement relating to the Spare Parts Collateral dated as of October 28, 2020
between the Company and the Loan Trustee, as secured party, as the same may be amended, supplemented or otherwise modified from
time to time, in accordance with its terms, (ii) the spare engines security agreement relating to the Spare Engine Collateral dated
as of October 28, 2020 between the Company and the Loan Trustee, as secured party, as the same may be amended, supplemented or
otherwise modified from time to time, in accordance with its terms, and (iii) the Indenture.

 

Spare
Engine Collateral:    Means, at any given time, each of the spare engines that is owned by the Company and secures the Series
B Equipment Note pursuant to the Security Documents.

 

Spare
Parts Collateral:    Means, at any given time, each of the aircraft spare parts that is owned by the Company and secures the Series
B Equipment Note pursuant to the Security Documents.

 

Special
Payment:    Means any payment (other than a Scheduled Payment) in respect of, or any proceeds of, the Series B Equipment Note
or Collateral.

 

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 Note 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 the
Series B Equipment Note and (iii) all rights of the Applicable Trust and the Trustee, on behalf of the Applicable Trust, 

 

     

    8

    

 

under the Intercreditor Agreement, the NPA and the Liquidity Facilities, 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 any Liquidity Facility.

 

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, Goldman Sachs & Co. LLC, Citigroup Global Markets Inc., Credit Suisse Securities (USA) LLC, BofA Securities,
Inc., Barclays Capital Inc., Deutsche Bank Securities Inc., J.P. Morgan Securities LLC, Morgan Stanley & Co. LLC, BBVA Securities
Inc., BNP Paribas Securities Corp., Credit Agricole Securities (USA) Inc., Standard Chartered Bank and Wells Fargo Securities,
LLC.

 

Underwriting
Agreement    : Means the Underwriting Agreement related to the Applicable Certificates dated January 25, 2021 by Goldman Sachs
 & Co. LLC, as representative of the several Underwriters and the Company, as the same may be amended, supplemented or otherwise
modified from time to time in accordance with its terms.

 

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. Such statement shall set forth (per $1,000 face amount Applicable Certificate as to (ii) and (iii) below) the following
information:

 

(i)       The
aggregate amount of funds distributed on such Distribution Date under the Agreement, indicating the amount allocable to each source,
including any portion thereof paid by the Liquidity Providers;

 

(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; and

 

(iv)       The
Pool Balance and the Pool Factor.

 

     

    9

    

 

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.

 

(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) and (a)(iii) 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)       [Reserved].

 

(d)       Promptly
following the date of any early redemption in part of, or any default in the payment of principal or interest in respect of, the
Series B Equipment Note held in the Applicable Trust, the Trustee 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 date
of such redemption or default, (y) the related Pool Factors for such Regular Distribution Dates and (z) the expected principal
payment schedule of the Series B Equipment Note held as Trust Property at the date of such notice. With respect to the Applicable
Certificates registered in the name of a Clearing Agency, promptly after the date of any such redemption or default, the Trustee
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 on such 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.

 

(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.

 

     

    10

    

 

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 Note held (subject to the Intercreditor
Agreement) in the Applicable Trust or realized upon the sale of such Series B Equipment Note, 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 (in whole or in part) of the Series B Equipment
Note 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),

 

     

    11

    

 

(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

 

(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 the 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 Note 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 Providers”.

 

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)(iii) (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 A Trust Agreement, all, but not less than all, of the Class A Certificates upon 15 days’ written
notice to 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 

  

     

    12

    

 

 

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, but not less than all, of 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 A Certificates pursuant to this Section 4.01(a)(i);

 

(ii)        [Reserved];

 

(iii)      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 A Certificates
pursuant to clause (i) above) to purchase all, but not less than all, of the Applicable Certificates, the Class A 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 A Trustee, 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 Applicable Certificates,
the Class A 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 Applicable
Certificates, the Class A Certificates and such senior Additional Certificates pursuant to this Section 4.01(a)(iii); and

 

(iv)      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.

 

     

    13 

    

 

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 or any Note
Document or on or in respect of 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 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 such 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 Intercreditor Agreement, the Liquidity Facility, the NPA, the Note Documents and all Applicable Certificates
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 Intercreditor Agreement, the Liquidity Facility, the NPA, the Note Documents and all such Applicable Certificates)
and (ii) 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 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.

 

     

    14 

    

 

(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. Delivery
of Documents; Delivery Dates. (a) The Trustee is hereby directed (i) to execute and deliver the Intercreditor Agreement and
the NPA on or prior to the Issuance Date, each in the form delivered to the Trustee by the Company, and (ii) subject to the respective
terms thereof, to perform its obligations thereunder. Upon request of the Company and the satisfaction or waiver of the closing
conditions specified in the Underwriting Agreement, the Trustee shall execute, deliver, authenticate, issue and sell Applicable
Certificates in authorized denominations equaling in the aggregate the amount set forth, with respect to the Applicable Trust,
in Schedule I to the Underwriting Agreement evidencing the entire ownership interest in the Applicable Trust, which amount equals
the aggregate principal amount of the Series B Equipment Note which may be purchased by the Trustee pursuant to the NPA. Except
as provided in Sections 3.03, 3.04, 3.05 and 3.06 of the Basic Agreement, the Trustee shall not execute, authenticate or deliver
Applicable Certificates in excess of the aggregate amount specified in this paragraph. The provisions of this Section 5.01(a)
supersede and replace the first sentence of Section 3.02(a) of the Basic Agreement, with respect to the Applicable Trust.

 

(b)       On
the Issuance Date, the Trustee shall enter into and perform its obligations under the NPA and cause such certificates, documents
and legal opinions relating to the Trustee to be duly delivered as required by the NPA. Upon satisfaction of the conditions specified
in the NPA, the Trustee shall purchase the Series B Equipment Note for the Applicable Trust with the proceeds of the Applicable
Certificates on the Issuance Date. The purchase price of such Series B Equipment Note shall equal the principal amount of such
Series B Equipment Note. The provisions of this Section 5.01(b) 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 and Section
2.02 of the Basic Agreement shall not apply to the Applicable Trust.

 

(c)       The
Trustee acknowledges its acceptance of all right, title and interest in and to the Trust Property to be acquired pursuant to Section
5.01(b) of this Trust Supplement and the NPA, and declares that it holds and will hold such right, title and interest for the benefit
of all present and future Applicable Certificateholders, upon the trusts set forth in the Agreement. By its acceptance of an Applicable
Certificate, each initial Applicable Certificateholder, as a grantor of the Applicable Trust, joins with the Trustee in the creation
of the Applicable Trust. The provisions of this Section 5.01(c) supersede and replace the provisions of Section 2.03 of the Basic
Agreement, with respect to the Applicable Trust.

 

     

    15 

    

 

Section 5.02. [Reserved].

 

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 or the NPA 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 and the NPA 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:

 

(a)       The
Trustee has full power, authority and legal right to execute, deliver and perform this Trust Supplement, the Intercreditor Agreement,
the NPA and the Note Documents to which it is or is to become a party and has taken all necessary action to authorize the execution,
delivery and performance by it of this Trust Supplement, the Intercreditor Agreement, the NPA and the Note Documents to which it
is or is to become a party;

 

(b)       The
execution, delivery and performance by the Trustee of this Trust Supplement, the Intercreditor Agreement, the NPA 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 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;

 

     

    16 

    

 

(c)       The
execution, delivery and performance by the Trustee of this Trust Supplement, the Intercreditor Agreement, the NPA 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)       This
Trust Supplement, the Intercreditor Agreement, the NPA 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”.

 

Section 6.02. Supplemental
Agreements without Consent of Applicable Certificateholders. Without limitation of Section 9.01 of the Basic Agreement (but,
for avoidance of doubt without limitation, as to any Liquidity Facility, of (a) the provisions of Section 2.11 thereof (as to establishing
and replacing a “Benchmark”), and (b) the implementation of a Replacement Liquidity Facility (as defined in the Intercreditor
Agreement) in accordance with Sections 3.5(l) and 9.1(a) of the Intercreditor Agreement and Section 7.08 of any applicable Liquidity
Facility), 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:

 

     

    17 

    

 

(i)        Enter
into one or more agreements supplemental to the NPA 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 or the NPA”,

 

(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 6.1.5 of the NPA and Section 9.1(d) of the Intercreditor Agreement,

 

(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
6.1.5 of the NPA and Section 9.1(c) of the Intercreditor Agreement, and

 

(iv)     Enter
into one or more agreements supplemental to the Agreement, the Intercreditor Agreement, the NPA or any Liquidity Facility to provide
for the replacement of one or more airframes or engines by one or more substitute airframes or substitute engines, subject to the
provisions of Section 4.04(f) of the Indenture, and other matters incidental thereto.

 

Section 6.03. Supplemental
Agreements with Consent of Applicable Certificateholders. Without limitation of Section
9.02 of the Basic Agreement (but, for avoidance of doubt without limitation, as to any Liquidity Facility, of (a) the provisions
of Section 2.11 thereof (as to establishing and replacing a “Benchmark”), and (b) the implementation of a Replacement
Liquidity Facility (as defined in the Intercreditor Agreement) in accordance with Sections 3.5(l) and 9.1(a) of the Intercreditor
Agreement and Section 7.08 of any applicable Liquidity Facility), 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 any Liquidity Facility or the NPA or modifying in any manner the rights and obligations of the Applicable Certificateholders
under any Liquidity Facility or the NPA.

 

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.

 

     

    18 

    

 

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 such 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 such money to the 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.

 

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

 

     

    19 

    

 

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.

 

     

     

    

 

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/ Pamela S. Hendry
	 	 	Name: 	 Pamela S. Hendry
	 	 	Title:	Vice President and Treasurer
	 	 
	 	WILMINGTON TRUST, NATIONAL
ASSOCIATION,
	 	as Trustee
	 	 
	 	By: 	/s/ Chad May
	 	 	Name: 	Chad May
	 	 	Title:	Vice President

 

Signature Page - Trust Supplement 2020-1A

 

     

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EXHIBIT A

 

 

FORM OF CERTIFICATE

 

Certificate

No.       

 

[Unless this certificate
is presented by an authorized representative of The Depository Trust Company, a New York corporation (“DTC”),
to Issuer or its agent for registration of transfer, exchange or payment, and any certificate issued is registered in the name
of Cede & Co. or in such other name as is requested by an authorized representative of DTC (and any payment is made to Cede
 & Co. or to such other entity as is requested by an authorized representative of DTC), ANY TRANSFER, PLEDGE OR OTHER USE HEREOF
FOR VALUE OR OTHERWISE BY OR TO ANY PERSON IS WRONGFUL inasmuch the registered owner hereof, Cede & Co., has an interest herein.]*

 

 

UNITED AIRLINES PASS THROUGH TRUST 2020-1B

 

United Airlines Pass Through Certificate,
Series 2020-1B

Issuance Date: February 1, 2021

 

Final Maturity Date: July 15, 2027

 

Evidencing A Fractional Undivided
Interest In The United Airlines Pass Through Trust 2020-1B The Property Of Which Shall Include A Series B Equipment Note Secured
By Collateral Owned By United Airlines, Inc.

 

 

$[_____________] Fractional Undivided Interest

representing 0.[__] % of the Trust per $1,000
face amount

 

THIS CERTIFIES
THAT_______________, for value received, is the registered owner of a $___________
(___________________________________________________ DOLLARS) Fractional Undivided Interest in the United Airlines Pass
Through Trust 2020-1B (the “Trust”) created by Wilmington Trust, National Association, as trustee (the
 “Trustee”), pursuant to a Pass Through Trust Agreement, dated as of October 3, 2012 (the “Basic
Agreement”), between the Trustee and United Airlines, Inc. (formerly known as Continental Airlines, Inc.), a
Delaware corporation (the “Company”), as supplemented by Trust Supplement No. 2020-1B thereto, dated as of
February 1, 2021 (the “Trust Supplement” and, together with the Basic Agreement, the
 “Agreement”), between the Trustee and the Company, a summary

 

 

 

	*	This legend to appear on Book-Entry Certificates to be deposited with the Depository Trust Company.

 

     

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of certain of the pertinent provisions
of which is set forth below. To the extent not otherwise defined herein, the capitalized terms used herein have the meanings
assigned to them in the Agreement. This Certificate is one of the duly authorized Certificates designated as “United
Airlines Pass Through Certificates, Series 2020-1B” (herein called the “Certificates”). This
Certificate is issued under and is subject to the terms, provisions and conditions of the Agreement. By virtue of its
acceptance hereof, the holder of this Certificate (the “Certificateholder” and, together with all other
holders of Certificates issued by the Trust, the “Certificateholders”) assents to and agrees to be bound
by the provisions of the Agreement and the Intercreditor Agreement. The property of the Trust includes a Series B Equipment
Note and all rights of the Trust to receive payments under the Intercreditor Agreement and the Liquidity Facilities (the
 “Trust Property”). The Series B Equipment Note is secured by, among other things, a security interest in
the Collateral.

 

The Certificates represent
Fractional Undivided Interests in the Trust and the Trust Property and have no rights, benefits or interest in respect of any other
separate trust established pursuant to the terms of the Basic Agreement for any other series of certificates issued pursuant thereto.

 

Subject to and in accordance
with the terms of the Agreement and the Intercreditor Agreement, from funds then available to the Trustee, there will be distributed
on January 15, April 15, July 15 and October 15 of each year (a “Regular Distribution Date”) commencing April
15, 2021, to the Person in whose name this Certificate is registered at the close of business on the 15th day preceding the Regular
Distribution Date, an amount in respect of the Scheduled Payments on the Series B Equipment Note due on such Regular Distribution
Date, the receipt of which has been confirmed by the Trustee, equal to the product of the percentage interest in the Trust evidenced
by this Certificate and an amount equal to the sum of such Scheduled Payments. Subject to and in accordance with the terms of the
Agreement and the Intercreditor Agreement, in the event that Special Payments on the Series B Equipment Note are received by the
Trustee, from funds then available to the Trustee, there shall be distributed on the applicable Special Distribution Date, to the
Person in whose name this Certificate is registered at the close of business on the 15th day preceding the Special Distribution
Date, an amount in respect of such Special Payments on the Series B Equipment Note, the receipt of which has been confirmed by
the Trustee, equal to the product of the percentage interest in the Trust evidenced by this Certificate and an amount equal to
the sum of such Special Payments so received. If a Regular Distribution Date or Special Distribution Date is not a Business Day,
distribution shall be made on the immediately following Business Day with the same force and effect as if made on such Regular
Distribution Date or Special Distribution Date and no interest shall accrue during the intervening period. The Trustee shall mail
notice of each Special Payment and the Special Distribution Date therefor to the Certificateholder of this Certificate.

 

Distributions on
this Certificate will be made by the Trustee by check mailed to the Person entitled thereto, without presentation or
surrender of this Certificate or the making of any notation hereon, except that with respect to Certificates registered on
the Record Date in the name of a Clearing Agency (or its nominee) such distribution shall be made by wire transfer. Except as
otherwise provided in the Agreement and notwithstanding the above, the final distribution on this Certificate will be made
after notice mailed by the Trustee of the pendency of

 

     

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such distribution and only upon presentation and surrender of this
Certificate at the office or agency of the Trustee specified in such notice.

 

The Certificates do not
represent a direct obligation of, or an obligation guaranteed by, or an interest in, the Company or the Trustee or any affiliate
thereof. The Certificates are limited in right of payment, all as more specifically set forth on the face hereof and in the Agreement.
All payments or distributions made to Certificateholders under the Agreement shall be made only from the Trust Property and only
to the extent that the Trustee shall have sufficient income or proceeds from the Trust Property to make such payments in accordance
with the terms of the Agreement. Each Certificateholder of this Certificate, by its acceptance hereof, agrees that it will look
solely to the income and proceeds from the Trust Property to the extent available for distribution to such Certificateholder as
provided in the Agreement. This Certificate does not purport to summarize the Agreement and reference is made to the Agreement
for information with respect to the interests, rights, benefits, obligations, privileges, and duties evidenced hereby. A copy of
the Agreement may be examined during normal business hours at the principal office of the Trustee, and at such other places, if
any, designated by the Trustee, by any Certificateholder upon request.

 

The Agreement permits,
with certain exceptions therein provided, the amendment thereof and the modification of the rights and obligations of the Company
and the rights of the Certificateholders under the Agreement at any time by the Company and the Trustee with the consent of the
Certificateholders holding Certificates evidencing Fractional Undivided Interests aggregating not less than a majority in interest
in the Trust. Any such consent by the Certificateholder of this Certificate shall be conclusive and binding on such Certificateholder
and upon all future Certificateholders of this Certificate and of any Certificate issued upon the transfer hereof or in exchange
hereof or in lieu hereof whether or not notation of such consent is made upon this Certificate. The Agreement also permits the
amendment thereof, in certain limited circumstances, without the consent of the Certificateholders of any of the Certificates.

 

As provided in the Agreement
and subject to certain limitations set forth therein, the transfer of this Certificate is registrable in the Register upon surrender
of this Certificate for registration of transfer at the offices or agencies maintained by the Trustee in its capacity as Registrar,
or by any successor Registrar, duly endorsed or accompanied by a written instrument of transfer in form satisfactory to the Trustee
and the Registrar, duly executed by the Certificateholder hereof or such Certificateholder’s attorney duly authorized in
writing, and thereupon one or more new Certificates of authorized denominations evidencing the same aggregate Fractional Undivided
Interest in the Trust will be issued to the designated transferee or transferees.

 

The Certificates are
issuable only as registered Certificates without coupons in minimum denominations of $1,000 Fractional Undivided Interest and integral
multiples thereof, except that one Certificate may be issued in a different denomination. As provided in the Agreement and subject
to certain limitations therein set forth, the Certificates are exchangeable for new Certificates of authorized denominations evidencing
the same aggregate Fractional Undivided Interest in the Trust, as requested by the Certificateholder surrendering the same.

 

     

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No service charge will
be made for any such registration of transfer or exchange, but the Trustee shall require payment of a sum sufficient to cover any
tax or governmental charge payable in connection therewith.

 

Each Certificateholder
and Investor, by its acceptance of this Certificate or a beneficial interest herein, agrees to treat the Trust as a grantor trust
for all U.S. federal, state and local income tax purposes.

 

The Trustee, the Registrar,
and any agent of the Trustee or the Registrar may treat the person in whose name this Certificate is registered as the owner hereof
for all purposes, and neither the Trustee, the Registrar, nor any such agent shall be affected by any notice to the contrary.

 

The obligations and responsibilities
created by the Agreement and the Trust created thereby shall terminate upon the distribution to Certificateholders 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.

 

Any Person acquiring
or accepting this Certificate or an interest herein will, by such acquisition or acceptance, be deemed to have represented and
warranted to and for the benefit of the Company that either: (i) 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 this Certificate or an interest herein or (ii) the purchase and holding of this Certificate or an interest
herein 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.

 

If the purchaser or transferee
of this Certificate or an interest herein is an employee benefit plan subject to Title I of ERISA or a plan subject to Section
4975 of the Code, it will be deemed to represent, warrant and agree that (i) none of United Airlines Holdings, Inc., the Company,
or the Underwriters, nor any of their affiliates, has provided any investment recommendation or investment advice on which it,
or any fiduciary or other person investing the assets of such plan (“Plan Fiduciary”), has relied in connection
with its decision to invest in this Certificate, and they are not otherwise acting as a fiduciary, as defined in Section 3(21)
of ERISA or Section 4975(e)(3) of the Code, to such plan or the Plan Fiduciary in connection with such plan’s acquisition
of this Certificate; and (ii) the Plan Fiduciary is exercising its own independent judgment in evaluating the transaction.

 

THE
AGREEMENT AND THIS CERTIFICATE SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF 

 

 

     

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NEW YORK AND THE
OBLIGATIONS, RIGHTS AND REMEDIES OF THE PARTIES HEREUNDER SHALL BE DETERMINED IN ACCORDANCE WITH SUCH LAWS.

 

Unless the certificate
of authentication hereon has been executed by the Trustee, by manual signature, this Certificate shall not be entitled to any benefit
under the Agreement or be valid for any purpose.

 

     

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IN WITNESS WHEREOF, the Trustee has caused
this Certificate to be duly executed.

 

	 	UNITED AIRLINES PASS THROUGH TRUST
2020-1B
	 	 
	 	By:  	WILMINGTON TRUST, NATIONAL ASSOCIATION,
	 	 	as Trustee
	 	 
	 	By:	 
	 	 	Name:
	 	 	Title:

 

     

     

    

 

FORM OF THE TRUSTEE’S CERTIFICATE
OF AUTHENTICATION

 

 

This is one of the Certificates referred
to in the within-mentioned Agreement.

 

	 	WILMINGTON TRUST, NATIONAL ASSOCIATION,
	 	as Trustee
	 	 
	 	By: 	 
	 	 	Name:
	 	 	Title:

 

     

     

    

 

EXHIBIT B

 

 

DTC Letter of Representations

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