Document:

EX-10.22

 Exhibit 10.22 

KEY OFFICER 
 SEVERANCE
AND CHANGE OF CONTROL AGREEMENT 
 This Key Officer Severance and Change of Control Agreement, dated as of June 1, 2017 (the
“Agreement”), is made and entered into between Semiconductor Components Industries, LLC (the “Company”), with offices at 5005 East McDowell Road, Phoenix, Arizona 85008, and Taner Ozcelik (the
“Executive”). 
 RECITALS 

A. The Executive has been and continues to be employed by the Company in a key officer position at the Company. As such, the Executive has earned a
commensurate level of base salary, Bonus (as defined below), equity based awards, and other compensation and benefits including certain perquisites. 
 B.
The Board of Directors (the “Board”) of the Parent (as defined below) and its Compensation Committee (the “Committee”) have determined that it is in the best interests of the Company and its stockholders to ensure
that the Company continue to have the full support, dedication and objectivity of certain key officers of the Company (including, without limitation, the key officer position that the Executive now holds (“Key Officer” or
“Key Officers”)) under various possible circumstances and situations (as summarized below in these Recitals) that the Company and the Key Officers and/or the Executive may find themselves. 

C. The Board and Committee believe it is important to diminish the inevitable distractions that each of the Key Officers may experience by virtue of the
personal risks and uncertainties associated with their key officer roles and responsibilities at the Company. The Board and Committee have therefore determined to provide Key Officers with assurances regarding certain severance payments and benefits
to be received by the Key Officers in the event of a loss of their employment so that these persons can provide their full attention and dedication to the business and affairs of the Company notwithstanding any attendant personal risks and
uncertainties to the Key Officers including the Executive. 
 D. The Board and Committee also recognize that the possibility, threat or occurrence of a
Change in Control (as defined below) transaction involving the Company can be a distraction to the Key Officers and can cause the Key Officers to consider alternative employment opportunities. The Board and Committee have therefore determined to
provide the Key Officers with: (i) incentive to continue their employment and to motivate each Key Officer to maximize the value of the Company upon a Change in Control; and (ii) certain severance payments and benefits upon each Key
Officer’s termination of employment following a Change in Control. 
 E. In connection with this Agreement, the Board and Committee have previously
stated the belief that it is important to secure each Key Officer’s commitment to comply with certain restrictive covenants contained herein (e.g., non-solicitation,
non-compete, confidentiality, etc.). These governing bodies also require herein that the Executive’s rights to any severance payments and benefits be subject to and conditioned upon the execution by the
Executive of a general release and waiver (in the form reasonably acceptable to the Company), waiving all claims the Executive may have against the Company, its affiliates and others. For the remainder of this Agreement, reference to the
“Board” may refer to both the Board and the Committee or either of these two bodies. 

 AGREEMENT 

NOW, THEREFORE, it is hereby agreed as follows: 

1. Employment Period. 

The employment of the Executive shall be subject to the terms and conditions of this Agreement commencing as of the date of the execution of
this Agreement (the “Effective Date”). The Executive shall be considered an “at-will” employee, which means that the Executive’s employment may be terminated by the Company or
by the Executive at any time for any reason or no reason at all. The period during which the Executive is employed by the Company pursuant to this Agreement shall be referred to as the “Employment Period.” The Executive’s
employment hereunder may be terminated during the Employment Period upon the earliest to occur of the following events (at which time the Employment Period shall be terminated): 

(a) Death. The Executive’s employment hereunder shall terminate upon the Executive’s death. 

(b) Disability. The Company shall be entitled to terminate the Executive’s employment hereunder for “Disability”
if, as a result of the Executive’s incapacity due to physical or mental illness or injury, after any accommodation required by law, the Executive shall have been unable to perform the Executive’s duties hereunder for a period of ninety
(90) consecutive days, and within thirty (30) days after Notice of Termination (as defined below) for Disability is given following such 90-day period the Executive shall not have returned to the
performance of his duties on a full-time basis. 
 (c) Cause. The Company may terminate the Executive’s employment hereunder for
Cause. For purposes of this Agreement, “Cause” shall mean: (i) a material breach by the Executive of this Agreement; (ii) the failure by the Executive to reasonably and substantially perform the Executive’s duties
hereunder (other than as a result of physical or mental illness or injury); (iii) the Executive’s willful misconduct or gross negligence which is materially injurious to the Company; or (iv) the commission by the Executive of a felony or
other serious crime involving moral turpitude. In the case of clauses (i) and (ii) above, the Company shall provide notice to the Executive indicating in reasonable detail the events or circumstances that it believes constitute Cause hereunder
and, if such breach or failure is reasonably susceptible to cure, provide the Executive with a reasonable period of time (not to exceed thirty (30) days) to cure such breach or failure. If, subsequent to the Executive’s termination of
employment hereunder for other than Cause, it is determined in good faith by the Board of the Parent that the Executive’s employment could have been terminated for Cause (except for a termination under (ii) of the above definition of
Cause), the Executive’s employment shall, at the election of the Board, be deemed to have been terminated for Cause retroactively to the date the events giving rise to Cause occurred. 

(d) Without Cause. The Company may terminate the Executive’s employment hereunder during the Employment Period without Cause. 

(e) Voluntarily. The Executive may voluntarily terminate the Executive’s employment hereunder (other than for Good Reason),
provided that the Executive provides the Company with notice of the Executive’s intent to terminate employment at least three (3) months in advance of the Date of Termination (as defined below). 

  
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 (f) For Good Reason. The Executive may terminate employment hereunder for Good Reason. For
purposes of this Agreement, “Good Reason” shall mean (i) a material breach of this Agreement by the Company, (ii) without the Executive’s written consent, reducing the Executive’s salary, as in effect immediately
prior to such reduction, while at the same time not proportionately reducing the salaries of the other comparable officers of the Company, or (iii) without the Executive’s written consent, a material and continued diminution of the
Executive’s duties and responsibilities hereunder, unless the Executive is provided with comparable duties and responsibilities in a comparable position (i.e., a position of equal or greater duties and responsibilities); provided
that in either (i), (ii), or (iii) above, the Executive shall notify the Company within thirty (30) days after the event or events which the Executive believes constitute Good Reason hereunder and shall describe in such notice in
reasonable detail such event or events and provide the Company a thirty (30) day period after delivery of such notice to cure such breach or diminution. 

2. Termination Procedure. 

(a) Notice of Termination. Any termination of the Executive’s employment by the Company or by the Executive during the Employment
Period (other than a termination on account of the death of the Executive) shall be communicated by written “Notice of Termination” to the other party hereto in accordance with Section 9(a). 

(b) Date of Termination. “Date of Termination” shall mean (i) if the Executive’s employment is terminated by
death, the date of the Executive’s death, (ii) if the Executive’s employment is terminated pursuant to Section 1(b), thirty (30) days after Notice of Termination, provided that the Executive shall not have returned to the
performance of the Executive’s duties hereunder on a full-time basis within such thirty (30) day period, (iii) if the Executive voluntarily terminates employment, the date specified in the notice given pursuant to Section 1(e)
herein which shall not be less than three (3) months after the Notice of Termination is delivered to the Company, (iv) if the Executive terminates employment for Good Reason pursuant to Section 1(f) herein, thirty (30) days after
Notice of Termination, and (v) if the Executive’s employment is terminated for any other reason, the date on which a Notice of Termination is given or any later date (within thirty (30) days, or any alternative time period agreed upon
by the parties, after the giving of such notice) set forth in such Notice of Termination. 
 3. Termination Payments. 

(a) Without Cause. In the event of the termination of the Executive’s employment during the Employment Period by the Company
without Cause, the Executive shall be entitled to: (i) any accrued but unused vacation, (ii) base salary through the Date of Termination (to the extent not theretofore paid), (iii) the continuation of base salary (as in effect immediately
prior to the termination) for twelve (12) months following the Date of Termination which, subject to the restrictions set forth below, shall be paid in accordance with the Company’s ordinary payroll practices in effect from time to time
and which shall begin on the first payroll period immediately following the date on which the release described below in Section 3(d) becomes irrevocable, (iv) any earned but unpaid Bonus (as defined below) for the performance period
immediately preceding the Date of Termination, and (v) a pro-rata portion of the Bonus, if any, for the performance period in which the Date of Termination occurs (based on the achievement of the
applicable performance criteria and related to the applicable performance period). Notwithstanding the foregoing, the amount of payment set forth in (iii) above during the six-month period following the
Date of Termination shall not exceed the separation pay exception limitation amount set forth in 

  
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Treasury Regulation Section 1.409A-1(b)(9)(iii)(A) (any amount that is payable during such six-month period
that is in excess of the separation pay exception limitation shall be paid in a single lump sum on the first day of the seventh month after the date of the Executive’s separation from service or, if earlier, the date of the Executive’s
death following such separation from service (the “Delayed Payment Date”). If the Company determines in good faith that the separation pay exception set forth in Treasury Regulation
Section 1.409A-1(b)(9)(iii) does not apply as of the Date of Termination, the amount set forth in (iii) above shall be paid (a) in an initial lump sum equal to six months’ base salary (net
of applicable taxes and withholdings) on the Delayed Payment Date and (b) thereafter in installments in accordance with the Company’s ordinary payroll practices. The amounts set forth in (i) and (ii) above shall be paid in
accordance with applicable law on the Date of Termination. The amounts set forth in (iv) and (v) above shall be paid as soon as is reasonably practicable after the close of the accounting books and records of the Company for the relevant
performance period at the same time bonuses are paid to other active employees, but in no event will payment be made for any performance period ending on December 31 before January 1 or after March 15 of the year following the year in
which the performance period ends. If payment by such date is administratively impracticable, payment may be made at a later date as permitted under Treasury Regulation Section 1.409A-1(b)(4)(ii). In
addition, in the event of a termination by the Company without Cause under this Section 3(a): (1) if the Executive elects to continue the Company’s group health plans pursuant to the Executive’s rights under COBRA, the Company shall
pay the Executive’s COBRA continuation premiums until the earlier of (x) the date the Executive receives group health benefits from another employer or (y) the one-year anniversary of the Date
of Termination; and (2) the Company will provide the Executive with outplacement services from vendors designated by the Company for a period of six (6) months following the Date of Termination, at a cost not to exceed $5,000. For the
avoidance of doubt, Executive shall pay Executive’s share of any such premiums with after-tax income and any premium reimbursements or premiums paid by the Company pursuant to this Section 3(a) shall
be taxable to Executive for federal and state tax purposes. For purposes of this Agreement, the “Bonus Program” shall mean the discretionary bonus program established and approved by the Board or Committee for employees of the
Company in similar positions to the Executive. Also, for purposes of this Agreement, the “Bonus” shall mean a bonus earned, if any, by the Executive on an annual or other performance period basis up to a certain percentage of base
salary actually earned and paid, if any, to the Executive during an applicable performance period, or a lesser or an additional amount, as approved by the Board or Committee under the Bonus Program and in all cases based on certain performance
criteria; provided that the Executive is actively employed by the Company on the date the bonuses are paid under the Bonus Program, except as provided in this Section 3(a). Notwithstanding anything else in this Agreement, the
payments and benefits provided in this Section 3(a) are subject to and conditioned upon the Executive executing (and not revoking) the general release and waiver described below in Section 3(d) and conditioned upon the Executive’s
compliance with the restrictive covenants provided in Sections 5 and 6 hereof. For the avoidance of any doubt or confusion, the Executive shall not be entitled to any payments or benefits provided under this Section 3(a) in the event of any for
Good Reason termination of employment by the Executive. Except as provided in this Section 3(a), the Company shall have no additional obligations under this Agreement. 

(b) Cause, Disability, Death or Voluntarily (including for Good Reason Absent a Change in Control). If the Executive’s employment
is terminated during the Employment Period by (i) the Company for Cause, (ii) as a result of the Executive’s death or Disability, or (iii) voluntarily by the Executive (including for Good Reason but absent a Change in Control (as
defined below)), the Company shall pay the Executive or the Executive’s estate, as the case may be, within thirty (30) days following the Date of Termination the Executive’s accrued but unused vacation and the Executive’s base
salary through the Date of Termination (to the extent not theretofore paid). Except as provided in this Section 3(b), the Company shall have no additional obligations under this Agreement. 

  
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 (c) Change in Control. If, within twenty-four (24) months following a Change
in Control, (i) the Company terminates the Executive’s employment without Cause or (ii) the Executive terminates employment with the Company for Good Reason, then, in addition to all the other benefits provided to the Executive under
Section 3(a) of this Agreement, notwithstanding any provision in any applicable option grant agreement or restricted stock or restricted stock unit award agreement where the award vests based solely on the passage of time between the Parent (or
the Company) and the Executive: (A) any outstanding but unvested options or any earned but unvested restricted stock or restricted stock unit awards where the award vests based solely on the passage of time granted on or prior to the date of
this Agreement or in connection with the Executive’s Promotion shall fully vest upon the Date of Termination; (B) any such options (both vested and unvested) granted on or prior to the date of this Agreement or in connection with the
Executive’s Promotion will remain fully exercisable until the first to occur of (1) the one-year anniversary of the Date of Termination, and (2) either the tenth anniversary or the seventh
anniversary of the grant date of such options depending upon what the relevant option grant agreement specifies with regard to an option’s term or expiration date, provided, however, that if the Company determines in good faith that the
extension of the option’s exercise period results in the options being considered non-qualified deferred compensation subject to Section 409A of the Internal Revenue Code of 1986, as amended (the
“Code”), such extension shall not take effect; and (C) an amount equal to the total target Bonus (as defined above) under the Bonus Program in effect as of the Date of Termination; provided that if Bonuses are paid
semi-annually as of the Date of Termination the Executive shall be entitled to an amount equal to two (2) times the total target Bonus for the performance period in which the Date of Termination occurs. The amounts set forth in subsection
(C) above shall be paid as soon as is reasonably practicable after the close of the accounting books and records of the Company for the relevant performance period at the same time bonuses are paid to other active employees, but in no event
will payment be made for any performance period ending on December 31 before January 1 or after March 15 of the year following the year in which the performance period ends. If payment by such date is administratively impracticable,
payment may be made at a later date as permitted under Treasury Regulation Section 1.409A-1(b)(4)(ii). For purposes of this Agreement, a “Change in Control” shall have the meaning set
forth in the ON Semiconductor Corporation Amended and Restated Stock Incentive Plan, as it may be amended from time to time. Except as provided in this Section 3(c), the Company shall have no additional obligations under this Agreement. For the
avoidance of doubt, the equity award vesting provisions described in this Section 3(c) do not apply to performance-based restricted stock or performance-based restricted stock unit awards and such awards shall continue to be governed by the
Amended and Restated Stock Incentive Plan, as it may be amended from time to time and any other related equity grant or award agreement document. 

(d) Release Required. To receive the termination-related payments and benefits described in this Section 3 within the time periods
described below, the Executive must execute (and not revoke) a general release and waiver (in a form reasonably acceptable to the Company) waiving all claims the Executive may have against the Company, its affiliates (including, without limitation,
Parent), successors, assigns, executives, officers and directors, and others. The release shall be provided to the Executive on or before the date that is five (5) days following the Executive’s Date of Termination and the Executive shall
have twenty-one (21) days following the 

  
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date on which the release is given to the Executive to sign and return the release to the Company. The release must be executed and returned to the Company within this time period and it must not
be revoked by the Executive during the seven (7) day revocation period that will be described in the release. Notwithstanding anything in this Agreement to the contrary, if the period during which the Executive may consider and revoke the
release spans two (2) calendar years, payment will not begin to be made to the Executive until the second calendar year. 
 4. Legal
Fees. 
 In the event of any contest or dispute between the Company and the Executive with respect to this Agreement or the
Executive’s employment hereunder, each of the parties shall be responsible for their respective legal fees and expenses. 
 5. Non-Solicitation. 
 The Executive recognizes that the Company’s employees are a valuable asset
to the Company and represent a substantial investment of Company time and resources. Accordingly, during the Employment Period and for one (1) year thereafter, the Executive hereby agrees not to, directly or indirectly, solicit or assist any
other person or entity in soliciting any employee of ON Semiconductor Corporation (the “Parent”), the Company or any of their subsidiaries to perform services for any entity (other than the Parent, the Company or their
subsidiaries), or attempt to induce any such employee to leave the employment of the Parent, the Company or their subsidiaries. 
 6.
Confidentiality; Non-Compete; Non-Disclosure; Non-Disparagement. 

(a) During the Employment Period and thereafter, the Executive shall hold in strict confidence any proprietary or Confidential Information
related to the Parent, the Company and their affiliates. For purposes of this Agreement, “Confidential Information” shall mean all information of the Parent, the Company or any of their affiliates (in whatever form) which is not
generally known to the public, including without limitation any inventions, processes, methods of distribution, customer lists or customers’ or trade secrets. “Confidential Information” does not include information that (i) is or
becomes part of the public domain through no fault of the Executive; (ii) is already known to the Executive and has been identified by the Executive to the Company in writing prior to the commencement of the Executive’s employment with
Company; or (iii) is subsequently lawfully received by the Executive from a third party not subject to confidentiality restrictions. 

(b) During the Executive’s employment with Company, and at all times thereafter, the Executive will (i) keep confidential and not
divulge, furnish or make accessible to any person any Confidential Information, and (ii) use the Confidential Information solely for the purpose of performing the Executive’s duties of employment and not for the Executive’s own
benefit or the benefit of any other Person. Promptly after the Date of Termination, or at any time upon request by Company, the Executive shall return to Company any Confidential Information (in hard copy and electronic formats) in the
Executive’s possession. 
 (c) With the limited exceptions noted below, the Executive shall be permitted to disclose Confidential
Information to the extent, but only to the extent, (i) Company provides its express prior written consent to such disclosure; (ii) it is necessary to perform the duties of the Executive’s employment; or (iii) as required by law;
provided, that prior to making any disclosure 

  
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of Confidential Information required by law (whether pursuant to a subpoena, government investigative demand, or other similar process), the Executive must notify Company of the Executive’s
intent to make such disclosure, so that Company may seek a protective order or other appropriate remedy and may participate with the Executive in determining the amount and type of Confidential Information, if any, which must be disclosed to comply
with applicable law. 
 (d) Limited Exceptions. There are limited exceptions to the above confidentiality requirement if the
Executive is providing information to government agencies, including but not limited to the Equal Employment Opportunity Commission, the National Labor Relations Board, the Occupational Safety and Health Administration (or its state equivalent), and
the Securities and Exchange Commission. This Agreement does not limit the Executive’s ability to communicate with any government agencies regarding matters within their jurisdiction or otherwise participate in any investigation or proceeding
that may be conducted by any government agency, including providing documents or other information, without notice, to the government agencies. Nothing in this Agreement shall prevent the Executive from the disclosure of Confidential Information or
trade secrets that: (i) is made: (A) in confidence to a federal, state, or local government official, either directly or indirectly, or to an attorney; and (B) solely for the purpose of reporting or investigating a suspected violation
of law; or (ii) is made in a complaint or other document filed in a lawsuit or other proceeding, if such filing is made under seal. In the event that the Executive files a lawsuit alleging retaliation by Company for reporting a suspected
violation of law, the Executive may disclose Confidential Information or trade secrets related to the suspected violation of law or alleged retaliation to the Executive’s attorney and use the Confidential Information or trade secrets in the
court proceeding if the Executive or the Executive’s attorney: (i) files any document containing Confidential Information or trade secrets under seal; and (ii) does not disclose Confidential Information or trade secrets, except
pursuant to court order. The Company provides this notice in compliance with, among other laws, the Defend Trade Secrets Act of 2016. 
 (e)
The Executive and the Company agree that the Parent, the Company, and their affiliates would likely suffer significant harm from the Executive competing with any or all of the Parent, the Company or their affiliates for a certain period of time
after the Date of Termination. Accordingly, the Executive agrees that the Executive will not, for a period of one (1) year following the Date of Termination, directly or indirectly, become employed by, engage in business with, serve as an agent
or consultant to, become a partner, member, principal, stockholder or other owner (other than a holder of less than 1% of the outstanding voting shares of any publicly held company) of, or otherwise perform services for (whether or not for
compensation) any Competitive Business (as defined below) in or from any location in the United States (the “Restricted Territory”); provided, however, that if (and only if) required by a court of competent jurisdiction for the provisions
of this section to remain valid and enforceable against the Executive, the Restricted Territory means the state of Arizona. For purposes of this Agreement, “Competitive Business” shall mean any individual, partnership, corporation,
limited liability company, unincorporated organization, trust or joint venture, or government agency or political subdivision thereof that is engaged in, or otherwise competes or has demonstrated a potential for competing with the Business (as
defined below) for customers of the Company or its affiliates anywhere in the world. For purposes of this Agreement, “Business” shall mean the design, marketing and sale of semiconductors in the power, analog, digital signal
processing, mixed signal, advanced logic, discrete and custom devices, data management semiconductors, memory and standard semiconductor components and integrated circuits offered by any or all of the Parent, the Company or their affiliates for use
in electronic products, appliances and automobiles, computing, consumer and industrial electronics, wireless communications, networking, military and aerospace and medical end-user markets. 

  
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 (f) Upon the termination of the Employment Period, the Executive shall not take, without the
prior written consent of the Company, any drawing, blueprint, specification or other document (in whatever form) of the Parent, the Company or their affiliates, which is of a confidential nature relating to the Parent, the Company or their
affiliates, or, without limitation, relating to any of their methods of distribution, or any description of any formulas or secret processes and will return any such information (in whatever form) then in the Executive’s possession. 

(g) During the Employment Period and at all times thereafter, the Executive agrees that the Executive will not make (or cause or encourage
others to make) statements that unlawfully defame or disparage the Parent, the Company, their affiliates and their officers, directors, members or executives. The Executive hereby agrees to cooperate with the Company in refuting any defamatory or
disparaging remarks by any third party made in respect of the Parent, the Company, their affiliates or their directors, members, officers or executives. 

7. Injunctive Relief. 

It is impossible to measure in money the damages that will accrue to the Company in the event that the Executive breaches any of the
restrictive covenants provided in Sections 5 and 6 hereof. In the event that the Executive breaches any such restrictive covenant, the Company shall be entitled to an injunction restraining the Executive from violating such restrictive covenant
(without posting any bond or other security). If the Company shall institute any action or proceeding to enforce any such restrictive covenant, the Executive hereby waives the claim or defense that the Company has an adequate remedy at law and
agrees not to assert in any such action or proceeding the claim or defense that the Company has an adequate remedy at law. The foregoing shall not prejudice the Company’s right to require the Executive to account for and pay over to the
Company, and the Executive hereby agrees to account for and pay over, the compensation, profits, monies, accruals or other benefits derived or received by the Executive as a result of any transaction constituting a breach of any of the restrictive
covenants provided in Sections 5 or 6 hereof. If the Executive is in breach of any of the provisions of Section 5 or 6 above, then the time periods set forth in Sections 5 or 6 will be extended by the length of time during which the Executive
is in breach of any of such provisions. 
 8. Representations. 

(a) The parties hereto hereby represent that they each have the authority to enter into this Agreement, and the Executive hereby represents to
the Company that the execution of, and performance of duties under, this Agreement shall not constitute a breach of or otherwise violate any other agreement to which the Executive is a party. 

(b) The Executive hereby represents to the Company that the Executive will not utilize or disclose any confidential information obtained by
the Executive in connection with the Executive’s former employment with respect to the Executive’s duties and responsibilities hereunder. 

9. Miscellaneous. 
 (a)
Any notice or other communication required or permitted under this Agreement shall be effective only if it is in writing and shall be deemed to be given when delivered personally or four (4) days after it is mailed by registered or certified
mail, postage prepaid, return receipt 

  
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requested or one day after it is sent by a reputable overnight courier service and, in each case, addressed as follows (or if it is sent through any other method agreed upon by the parties): 

If to the Company: 

Semiconductor Components Industries, LLC 

5005 East McDowell Road 
 Phoenix,
Arizona 85008 
 Attention: General Counsel 

If to the Executive, to the address for the Executive on file with the Company at the time of the notice or to such other address as any party
hereto may designate by notice to the others. 
 (b) This Agreement shall constitute the entire agreement among the parties hereto with
respect to the Executive’s employment hereunder, and supersedes and is in full substitution for any and all prior understandings or agreements with respect to the Executive’s employment (it being understood that, except as otherwise
expressly stated in this Agreement, any equity awards granted to the Executive shall be governed by the relevant equity plan document and any other related equity grant or award agreement and any other related documents). 

(c) This Agreement may be amended only by an instrument in writing signed by the parties hereto, and any provision hereof may be waived only
by an instrument in writing signed by the party or parties against whom or which enforcement of such waiver is sought. The failure of any party hereto at any time to require the performance by any other party hereto of any provision hereof shall in
no way affect the full right to require such performance at any time thereafter, nor shall the waiver by any party hereto of a breach of any provision hereof be taken or held to be a waiver of any succeeding breach of such provision or a waiver of
the provision itself or a waiver of any other provision of this Agreement. 
 (d) The parties hereto acknowledge and agree that each party
has reviewed and negotiated the terms and provisions of this Agreement and has had the opportunity to contribute to its revision. Accordingly, the rule of construction to the effect that ambiguities are resolved against the drafting party shall not
be employed in the interpretation of this Agreement. Rather, the terms of this Agreement shall be construed fairly as to both parties hereto and not in favor or against either party. 

(e) (i) This Agreement is binding on and is for the benefit of the parties hereto and their respective successors, assigns, heirs, executors,
administrators and other legal representatives. Neither this Agreement nor any right or obligation hereunder may be assigned by the Executive. 

(ii) The Company shall require any successor (whether direct or indirect, by purchase, merger, consolidation or otherwise) to all or
substantially all of the business and/or assets of the Company to assume this Agreement in the same manner and to the same extent that the Company would have been required to perform it if no such succession had taken place. As used in the
Agreement, the “Company” shall mean both the Company (as defined above) and any such successor that assumes this Agreement, by operation of law or otherwise. 

(f) Any provision of this Agreement (or portion thereof) which is deemed invalid, illegal or unenforceable in any jurisdiction shall, as to
that jurisdiction and subject to this Section, be ineffective to the extent of such invalidity, illegality or unenforceability, without affecting in any 

  
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way the remaining provisions thereof in such jurisdiction or rendering that or any other provisions of this Agreement invalid, illegal, or unenforceable in any other jurisdiction. If any covenant
should be deemed invalid, illegal or unenforceable because its scope is considered excessive, such covenant shall be modified so that the scope of the covenant is reduced only to the minimum extent necessary to render the modified covenant valid,
legal and enforceable. No waiver of any provision or violation of this Agreement by Company shall be implied by Company’s forbearance or failure to take action. 

(g) The Company may withhold from any amounts payable to the Executive hereunder all federal, state, city or other taxes that the Company may
reasonably determine are required to be withheld pursuant to any applicable law or regulation, (it being understood, that the Executive shall be responsible for payment of all taxes in respect of the payments and benefits provided herein). 

(h) The payments and other consideration to the Executive under this Agreement shall be made without right of offset. 

(i) (i) Notwithstanding anything set forth herein to the contrary, no amount payable pursuant to this Agreement on account of the
Executive’s termination of employment which constitutes a “deferral of compensation” within the meaning of the Treasury Regulations issued pursuant to Section 409A of the Code (“Section 409A
Regulations”) shall be paid unless and until the Executive has incurred a “separation from service” within the meaning of the Section 409A Regulations. Furthermore, to the extent that the Executive is a “specified
employee” within the meaning of the Section 409A Regulations as of the date of the Executive’s separation from service, no amount that constitutes a deferral of compensation that is payable on account of the Executive’s
separation from service shall be paid to the Executive before the Delayed Payment Date. All such amounts that would, but for this subsection, become payable prior to the Delayed Payment Date will be accumulated and paid on the Delayed Payment Date.

 (ii) The Company intends that income provided to the Executive pursuant to this Agreement will not be subject to taxation under
Section 409A of the Code. The provisions of this Agreement shall be interpreted and construed in favor of satisfying any applicable requirements of Section 409A of the Code and the Section 409A Regulations or an exception thereto.
However, the Company does not guarantee any particular tax effect for income provided to the Executive pursuant to this Agreement. In any event, except for the Company’s responsibility to withhold applicable income and employment taxes from
compensation paid or provided to the Executive, the Company shall not be responsible for the payment of any applicable taxes on compensation paid or provided to the Executive pursuant to this Agreement. 

(j) By signing this Agreement, the Executive agrees to be bound by, and comply with the terms of the compensation recovery policy or policies
(and related practices) of the Company or its affiliates as such may be in effect from time-to-time. 

(k) This Agreement shall be governed by and construed in accordance with the laws of the State of Arizona without reference to its principles
of conflicts of law. 
 (l) This Agreement may be executed in several counterparts, each of which shall be deemed an original, but all of
which shall constitute one and the same instrument. 

  
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 (m) The headings in this Agreement are inserted for convenience of reference only and shall not
be a part of or control or affect the meaning of any provision hereof. 
 10. Section 280G of the Code. 

(a) Sections 280G and 4999 of the Code may place significant tax burdens on both Executive and the Company if the total payments made to
Executive due to certain change in control events described in Section 280G of the Code (the “Total Change in Control Payments”) equal or exceed Executive’s 280G Cap. For this purpose, Executive’s “280G
Cap” is equal to Executive’s average annual compensation in the five (5) calendar years preceding the calendar year in which the change in control event occurs (the “Base Period Income Amount”) times three (3). If
the Total Change in Control Payments equal or exceed the 280G Cap, Section 4999 of the Code imposes a 20% excise tax (the “Excise Tax”) on all amounts in excess of one (1) times Executive’s Base Period Income Amount.
In determining whether the Total Change in Control Payments will equal or exceed the 280G Cap and result in the imposition of an Excise Tax, the provisions of Sections 280G and 4999 of the Code and the applicable Treasury Regulations will control
over the general provisions of this Section 10. All determinations and calculations required to implement the rules set forth in this Section 10 shall take into account all applicable federal, state, and local income taxes and employment
taxes (and for purposes of such calculations, Executive shall be deemed to pay income taxes at the highest combined federal, state and local marginal tax rates for the calendar year in which the Total Change in Control Payments are to be made, less
the maximum federal income tax deduction that could be obtained as a result of a deduction for state and local taxes (the “Assumed Taxes”)). 

(b) Subject to the “best net” exception described in Section 10(c), in order to avoid the imposition of the Excise Tax, the
total payments to which Executive is entitled under this Agreement or otherwise will be reduced to the extent necessary to avoid equaling or exceeding the 280G Cap, with such reduction first applied to the cash severance payments that Executive
would otherwise be entitled to receive pursuant to this Agreement and thereafter applied in a manner that will not subject Executive to tax and penalties under Section 409A of the Code. 

(c) If Executive’s Total Change in Control Payments minus the Excise Tax and the Assumed Taxes (payable with respect to the amount of the
Total Change in Control Payments) exceeds the 280G Cap minus the Assumed Taxes (payable with respect to the amount of the 280G Cap), then the total payments to which Executive is entitled under this Agreement or otherwise will not be reduced
pursuant to Section 10(b). If this “best net” exception applies, Executive shall be fully responsible for paying any Excise Tax (and income or other taxes) that may be imposed on Executive pursuant to Section 4999 of the Code or
otherwise. 
 (d) The Company will engage a law firm, a certified public accounting firm, and/or a firm of reputable executive compensation
consultants (the “Consultant”) to make any necessary determinations and to perform any necessary calculations required in order to implement the rules set forth in this Section 10. The Consultant shall provide detailed
supporting calculations to both the Company and Executive and all fees and expenses of the Consultant shall be borne by the Company. If the provisions of Section 280G and 4999 of the Code are repealed without succession, this Section 10
shall be of no further force or effect. In addition, if this provision does not apply to Executive for whatever reason, this Section shall be of no further force or effect. 

  
 11 

 IN WITNESS WHEREOF, the parties have executed this Agreement as of the date first written
above. 
  

	
	Semiconductor Components Industries, LLC
	
	/s/ KEITH D. JACKSON
	Name: Keith Jackson
	Title: Chief Executive Officer and President
	
	/s/ TANER OZCELIK
	Name: Taner Ozcelik

  
 12EX-4.1

 Exhibit 4.1 

EXECUTION VERSION 

TRUST SUPPLEMENT No. 2018-1AA-O 

Dated as of February 14, 2018 

between 
 WILMINGTON TRUST,
NATIONAL ASSOCIATION 
 as Trustee, 

and 
 UNITED AIRLINES, INC. 

to 
 PASS THROUGH TRUST AGREEMENT

 Dated as of October 3, 2012 

$677,175,000 
 United Airlines
Pass Through Trust 2018-1AA-O 
 3.50% United Airlines Pass
Through Certificates, Series 2018-1AA-O 

 TABLE OF CONTENTS 
  

							
	 	 	 	  	Page	 
	 ARTICLE I THE CERTIFICATES
	  	 	2	 
	 Section 1.01.
	 	 The Certificates
	  	 	2	 
		
	 ARTICLE II DEFINITIONS
	  	 	5	 
	 Section 2.01.
	 	 Definitions
	  	 	5	 
		
	 ARTICLE III DISTRIBUTIONS; STATEMENTS TO CERTIFICATEHOLDERS
	  	 	11	 
	 Section 3.01.
	 	 Statements to Applicable Certificateholders
	  	 	11	 
	 Section 3.02.
	 	 Special Payments Account
	  	 	13	 
	 Section 3.03.
	 	 Distributions from Special Payments Account
	  	 	13	 
	 Section 3.04.
	 	 Limitation of Liability for Payments
	  	 	14	 
		
	 ARTICLE IV DEFAULT
	  	 	14	 
	 Section 4.01.
	 	 Purchase Rights of Certificateholders
	  	 	14	 
	 Section 4.02.
	 	 Amendment of Section 6.05 of the Basic Agreement
	  	 	17	 
		
	 ARTICLE V THE TRUSTEE
	  	 	17	 
	 Section 5.01.
	 	 Delivery of Documents; Delivery Dates
	  	 	17	 
	 Section 5.02.
	 	 Withdrawal of Deposits
	  	 	18	 
	 Section 5.03.
	 	 The Trustee
	  	 	18	 
	 Section 5.04.
	 	 Representations and Warranties of the Trustee
	  	 	19	 
	 Section 5.05.
	 	 Trustee Liens
	  	 	20	 
		
	 ARTICLE VI ADDITIONAL AMENDMENT; SUPPLEMENTAL AGREEMENTS
	  	 	20	 
	 Section 6.01.
	 	 Amendment of Section 5.02 of the Basic Agreement
	  	 	20	 
	 Section 6.02.
	 	 Supplemental Agreements without Consent of Applicable Certificateholders
	  	 	20	 
	 Section 6.03.
	 	 Supplemental Agreements with Consent of Applicable Certificateholders
	  	 	21	 
	 Section 6.04.
	 	 Consent of Holders of Certificates Issued under Other Trusts
	  	 	21	 
		
	 ARTICLE VII TERMINATION OF TRUST
	  	 	21	 
	 Section 7.01.
	 	 Termination of the Applicable Trust
	  	 	21	 
		
	ARTICLE VIII MISCELLANEOUS PROVISIONS	  	 	23	 
	 Section 8.01.
	 	 Basic Agreement Ratified
	  	 	23	 
	 Section 8.02.
	 	 GOVERNING LAW
	  	 	24	 
	 Section 8.03.
	 	 Execution in Counterparts
	  	 	24	 
	 Section 8.04.
	 	 Intention of Parties
	  	 	24	 

  

					
	 Exhibit A
	 	-	  	 Form of Certificate

	 Exhibit B
	 	-	  	 DTC Letter of Representations

	 Exhibit C
	 	-	  	 Form of Assignment and Assumption Agreement

  
 i 

 This Trust Supplement No.
2018-1AA-O, dated as of February 14, 2018 (herein called the “Trust Supplement”), between United Airlines, Inc., a Delaware corporation (the
“Company”), and Wilmington Trust, National Association (the “Trustee”), to the Pass Through Trust Agreement, dated as of October 3, 2012, between the Company (formerly known as Continental Airlines, Inc.) and
the Trustee (the “Basic Agreement”). 
 W I T N E S S E T
H: 
 WHEREAS, the Basic Agreement, unlimited as to the aggregate face amount of Certificates (unless otherwise specified herein,
capitalized terms used herein without definition having the respective meanings specified in the Basic Agreement) which may be issued thereunder, has heretofore been executed and delivered; 

WHEREAS, the Company is the owner of or has obtained commitments from Boeing for the delivery of two Boeing
737-800 aircraft, six Boeing 737 MAX 9 aircraft, five Boeing 787-9 aircraft and three Boeing 777-300ER aircraft (collectively,
the “Applicable Aircraft”); 
 WHEREAS, the Company intends to finance each of the Applicable Aircraft; 

WHEREAS, with respect to each Applicable Aircraft, the Company will issue pursuant to an Indenture, on a recourse basis, Equipment Notes to
finance a portion of the purchase price of such Applicable Aircraft; 
 WHEREAS, the Trustee hereby declares the creation of the United
Airlines Pass Through Trust 2018-1AA-O (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 except for those Certificates to which an Escrow Receipt (as defined below) has been affixed; 

WHEREAS, the Escrow Agent and the Underwriters have contemporaneously herewith entered into an Escrow Agreement with the Escrow Paying Agent
pursuant to which the Underwriters have delivered to the Escrow Agent the proceeds from the sale of the Applicable Certificates, and have irrevocably instructed the Escrow Agent to withdraw and pay funds from such proceeds upon request and proper
certification by the Trustee to purchase Equipment Notes as the conditions set forth in the NPA for such purchase are satisfied from time to time prior to the Delivery Period Termination Date; 

WHEREAS, the Escrow Agent on behalf of the Applicable Certificateholders has contemporaneously herewith entered into a Deposit Agreement with
the Depositary under which the Deposits referred to therein will be made and from which it will withdraw funds to allow the Trustee to purchase Equipment Notes from time to time prior to the Delivery Period Termination Date; 

  
 1 

 WHEREAS, pursuant to the terms and conditions of the Basic Agreement as supplemented by this
Trust Supplement (the “Agreement”) and the NPA, upon the financing of an Applicable Aircraft under the NPA, the Trustee on behalf of the Applicable Trust, using funds withdrawn under the Escrow Agreement, shall purchase one or more
Equipment Notes 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 Equipment Notes 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 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 2018-1AA-O” (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 $677,175,000. 

(b)    The Regular Distribution Dates with respect to any distribution of Scheduled Payments means
March 1 and September 1 of each year, commencing on September 1, 2018 until distribution of all of the Scheduled Payments to be made under the Equipment Notes has been made. 

  
 2 

 (c)    The Special Distribution Dates with respect to the
Applicable Certificates means any Business Day on which a Special Payment is to be distributed pursuant to the Agreement. 

(d)    At the Escrow Agent’s request under the Escrow Agreement, the Trustee shall affix the
corresponding Escrow Receipt to each Applicable Certificate. In any event, any transfer or exchange of any Applicable Certificate shall also effect a transfer or exchange of the related Escrow Receipt. Prior to the Final Distribution, no transfer or
exchange of any Applicable Certificate shall be permitted unless the corresponding Escrow Receipt is attached thereto and also is so transferred or exchanged. By acceptance of any Applicable Certificate to which an Escrow Receipt is attached, each
Holder of such an Applicable Certificate acknowledges and accepts the restrictions on transfer of the Escrow Receipt set forth herein and in the Escrow Agreement. 

(e)    (i) The Applicable Certificates shall be in the form attached hereto as Exhibit A. Any Person
acquiring or accepting an Applicable Certificate or an interest therein will, by such acquisition or acceptance, be deemed to have represented and warranted to and for the benefit of the Company that either (x) no assets of an employee benefit
plan subject to Title I of the Employee Retirement Income Security Act of 1974, as amended (“ERISA”), a plan subject to Section 4975 of the Internal Revenue Code of 1986, as amended (the “Code”), or a
governmental, church or foreign plan subject to a law that is similar to Title I of ERISA or Section 4975 of the Code (a “Similar Law Plan”) have been used to purchase or hold such Applicable Certificate or an interest therein
or (y) the purchase and holding of such Applicable Certificate or an interest therein either (A) in the case of assets of an employee benefit plan subject to Title I of ERISA or a plan subject to Section 4975 of the Code, are exempt
from the prohibited transaction restrictions of ERISA and the Code pursuant to one or more prohibited transaction statutory or administrative exemptions or (B) in the case of assets of a Similar Law Plan, will not violate any similar state,
local or foreign law. 
 (ii)    The Applicable Certificates shall be Book-Entry Certificates and shall
be subject to the conditions set forth in the Letter of Representations between the Applicable Trust and the Clearing Agency attached hereto as Exhibit B. 

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

  
 3 

 
independent fiduciary that holds, or has under management or control, total assets of at least $50 million (in each case, as specified in 29 C.F.R.
2510.3-21(c)(1)(i)(A)-(E)); (C) is capable of evaluating investment risks independently, both in general and with regard to particular transactions and investment strategies (including, without limitation,
with respect to the decision to acquire or accept the Applicable Certificate or interest therein); (D) has been fairly informed that the Company, the Underwriters, and their respective affiliates have not and will not undertake to provide impartial
investment advice, or to give advice in a fiduciary capacity, in connection with the acquisition or acceptance of the Applicable Certificate or interest therein; (E) has been fairly informed of the existence and nature of the financial
interests that the Company, the Underwriters, and their respective affiliates have in the Benefit Plan Investor’s acquisition or acceptance of the Applicable Certificate or interest therein, which interests may conflict with the interest of the
Benefit Plan Investor, as more fully described in the offering materials; and (F) is a fiduciary under ERISA or the Code, or both, with respect to the decision to acquire or accept the Applicable Certificate or interest therein and is
responsible for exercising (and has exercised) independent judgment in evaluating whether to invest the assets of such Benefit Plan Investor in the Applicable Certificate or interest therein; and (ii) neither the Benefit Plan Investor nor such
duly authorized fiduciary of the Benefit Plan Investor is paying the Company, any Underwriter, or any of their respective affiliates, any fee or other compensation directly for the provision of investment advice (as opposed to other services) in
connection with the Benefit Plan Investor’s acquisition or acceptance of the Applicable Certificate or interest therein. 

(g)    The “Participation Agreements” as defined in this Trust Supplement are the “Note
Purchase Agreements” referred to in the Basic Agreement. 
 (h)    The Applicable Certificates are
subject to the Intercreditor Agreement, the Deposit Agreement and the Escrow Agreement. 
 (i)    The
Applicable Certificates are entitled to the benefits of the Liquidity Facility. 
 (j)    The Responsible Party is the
Company. 
 (k)    The date referred to in clause (i) of the definition of the term “PTC Event
of Default” in the Basic Agreement is the Final Maturity Date. 
 (l)    The “particular
sections of the Note Purchase Agreement”, for purposes of clause (3) of Section 7.07 of the Basic Agreement, are Section 8.1 of each Participation Agreement. 

(m)    The Equipment Notes to be acquired and held in the Applicable Trust, and the related Aircraft and
Note Documents, are described in the NPA. 

  
 4 

 ARTICLE II 

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

Agreement: Has the meaning specified in the recitals hereto. 

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

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

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

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 Closing Date: Has the meaning specified in Section 5.01(b) of this
Trust Supplement. 
 Applicable Participation Agreement: Has the meaning specified in Section 5.01(b) of this
Trust Supplement. 
 Applicable Trust: Has the meaning specified in the recitals hereto. 

Assignment and Assumption Agreement: Means the assignment and assumption agreement substantially in the form of Exhibit
C hereto executed and delivered in accordance with Section 7.01 of this Trust Supplement. 
 Basic Agreement: Has
the meaning specified in the first paragraph of this Trust Supplement. 
 Boeing: Means The Boeing Company. 

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

  
 5 

 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 all of the Indentures or, if it has entered into
such agreements, has at any time thereafter failed to cure any default under any of the Indentures in accordance with Section 1110(a)(2)(B) of the U.S. Bankruptcy Code; or (B) prior to the expiry of the
60-Day Period, the Company shall have abandoned any Aircraft. 
 Class: Has
the meaning specified in the Intercreditor Agreement. 
 Closing Notice: Has the meaning specified in the NPA. 

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

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

Cut-off Date: Means the earlier of (a) the Delivery Period
Termination Date and (b) the date on which a Triggering Event occurs. 
 Delivery Period Termination Date: Means
the earlier of (a) August 31, 2018 (provided that, if a labor strike occurs or continues at Boeing after the Issuance Date and on or prior to such date referred to in this clause (a), such date shall be extended by adding thereto the
number of days that such strike continued in effect after the Issuance Date, but not more than 60 days (such extended number of days, the “Strike Period”)), and (b) the date on which Equipment Notes issued with respect to all of the
Applicable Aircraft (including any Substitute Aircraft in lieu of any Applicable Aircraft) have been purchased by the Applicable Trust and the United Airlines Pass Through Trust
2018-1A-O in accordance with the NPA. 

Deposit Agreement: Means the Deposit Agreement dated as of February 14, 2018 relating to the Applicable Certificates
between the Depositary and the Escrow Agent, as the same may be amended, supplemented or otherwise modified from time to time in accordance with its terms. 

Depositary: Means Citibank, N.A.. 

Deposits: Has the meaning specified in the Deposit Agreement. 

  
 6 

 Distribution Date: Means any Regular Distribution Date or Special
Distribution Date as the context requires. 
 ERISA: Has the meaning specified in Section 1.01(e) of this Trust
Supplement. 
 Escrow Agent: Means, initially, U.S. Bank National Association and any replacement or successor
therefor appointed in accordance with the Escrow Agreement. 
 Escrow Agreement: Means the Escrow and Paying Agent
Agreement dated as of February 14, 2018 relating to the Applicable Certificates, among the Escrow Agent, the Escrow Paying Agent, the Trustee and the Underwriters, as the same may be amended, supplemented or otherwise modified from time to time in
accordance with its terms. 
 Escrow Paying Agent: Means the Person acting as paying agent under the Escrow Agreement.

 Escrow Receipt: Means the receipt substantially in the form annexed to the Escrow Agreement representing a
Fractional Undivided Interest in the funds held in escrow thereunder. 
 Final Distribution: Has the meaning specified
in the Escrow Agreement. 
 Final Maturity Date: Means September 1, 2031. 

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

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

Final Withdrawal Notice: Has the meaning specified in Section 5.02 of this Trust Supplement. 

Indenture: Means each of the separate trust indentures and mortgages relating to the Aircraft, each as specified or
described in a Closing Notice delivered pursuant to the NPA or the related Participation Agreement, in each case as the same may be amended, supplemented or otherwise modified from time to time in accordance with its terms. 

  
 7 

 Intercreditor Agreement: Means the Intercreditor Agreement dated as of
February 14, 2018 among the Trustee, the Other Trustees party thereto, the Liquidity Provider, the liquidity provider relating to the Class A Certificates and Wilmington Trust, National Association, as Subordination Agent and as trustee
thereunder, as 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: Has the meaning specified in the NPA. 

Liquidity Facility: Means, initially, the Revolving Credit Agreement dated as of February 14, 2018 relating to the
Applicable Certificates, between the Liquidity Provider and Wilmington Trust, National Association, as Subordination Agent, as agent and trustee for the Applicable Trust, and, from and after the replacement of such agreement pursuant to the
Intercreditor Agreement, the replacement liquidity facility therefor, in each case as amended, supplemented or otherwise modified from time to time in accordance with their respective terms. 

Liquidity Provider: Means, initially, National Australia Bank Limited, acting through its New York Branch, and any
replacements or successors therefor appointed in accordance with the Intercreditor Agreement. 
 Make-Whole Amount:
Has the meaning specified in any Indenture. 
 Note Documents: Means the Equipment Notes with respect to the
Applicable Certificates and, with respect to any such Equipment Note, the Indenture and the Participation Agreement relating to such Equipment Note. 

Notice of Purchase Withdrawal: Has the meaning specified in the Deposit Agreement. 

NPA: Means the Note Purchase Agreement, dated as of the date hereof among the Trustee, the Other Trustees party thereto,
the Company, the Escrow Agent, the Escrow Paying Agent and the Subordination Agent, providing for, among other things, the purchase of 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. 2018-1A-O, dated as of the date hereof relating to United Airlines Pass Through Trust
2018-1A-O, (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. 

  
 8 

 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 2018-1A-O, an Additional Trust or Trusts, if any, and a Refinancing Trust or Trusts, if any, created by the Other Agreements. 

Participation Agreement: Means each Participation Agreement to be entered into, or entered into (as the case may be), by
the Trustee pursuant to the NPA, as the same may be amended, supplemented or otherwise modified in accordance with its terms. 

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 or in respect of Deposits other than payments made in respect of interest or premium (including Make-Whole Amount) thereon or
reimbursement of any costs or expenses incurred in connection therewith. The Pool Balance as of any date shall be computed after giving effect to any special distribution with respect to unused Deposits, payment of principal of the Equipment Notes
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 unused Deposits, payment of principal of the Equipment Notes or payment with respect to other Trust Property and the distribution thereof to be made
on that date. 
 Prospectus Supplement: Means the final Prospectus Supplement dated January 31, 2018 relating to
the offering of the Applicable Certificates and the Class A Certificates. 
 Ratings Confirmation: Has the
meaning specified in the Intercreditor Agreement. 
 Related Pass Through Trust Agreement: Means the Basic Agreement,
as supplemented by the Trust Supplement No. 2018-1AA-S, dated as of the date hereof relating to the United Airlines Pass Through Trust 2018-1AA-S and entered into by the Company and the Related Trustee, which agreement becomes effective upon the execution and delivery of the Assignment and Assumption Agreement pursuant to Section 7.01
of this Trust Supplement. 
 Related Trust: Means the United Airlines Pass Through Trust 2018-1AA-S, to be formed under the Related Pass Through Trust Agreement. 

Related Trustee: Means the trustee under the Related Pass Through Trust Agreement. 

  
 9 

 Scheduled Closing Date: Has the meaning specified in the NPA. 

Scheduled Payment: Means, with respect to any Equipment Note, (i) any payment of principal or interest on such
Equipment Note (other than any such payment which is not in fact received by the Trustee or the Subordination Agent within five days of the date on which such payment is scheduled to be made) or (ii) any payment of interest on the Applicable
Certificates with funds drawn under the Liquidity Facility, which payment in any such case represents the installment of principal on such Equipment Note at the stated maturity of such installment, the payment of regularly scheduled interest accrued
on the unpaid principal amount of such Equipment Note, or both; provided, however, that any payment of principal, premium (including Make-Whole Amount), if any, or interest resulting from the redemption or purchase of any Equipment
Note shall not constitute a Scheduled Payment. 
 Special Payment: Means any payment (other than a Scheduled Payment)
in respect of, or any proceeds of, any Equipment Note or Collateral (as defined in each Indenture). 
 Substitute
Aircraft: Has the meaning specified in the NPA. 
 Transfer Date: Has the meaning specified in Section 7.01
of this Trust Supplement. 
 Triggering Event: Has the meaning assigned to such term in the Intercreditor Agreement.

 Trust Property: Means (i) subject to the Intercreditor Agreement, the Equipment Notes held as the property of
the Applicable Trust, all monies at any time paid thereon or in respect thereof and all monies due and to become due thereunder, (ii) funds from time to time deposited in the Certificate Account and the Special Payments Account and, subject to
the Intercreditor Agreement, any proceeds from the sale by the Trustee pursuant to Article VI of the Basic Agreement of any Equipment Note and (iii) all rights of the Applicable Trust and the Trustee, on behalf of the Applicable Trust,
under the Intercreditor Agreement, the Escrow Agreement, the NPA and the Liquidity Facility, including, without limitation, all rights to receive certain payments thereunder, and all monies paid to the Trustee on behalf of the Applicable Trust
pursuant to the Intercreditor Agreement or the Liquidity Facility, provided that rights with respect to the Deposits or under the Escrow Agreement, except for the right to direct withdrawals for the purchase of Equipment Notes to be held herein,
will not constitute Trust Property. 
 Trust Supplement: Has the meaning specified in the first paragraph of this
trust supplement. 
 Trustee: Has the meaning specified in the first paragraph of this Trust Supplement. 

  
 10 

 Underwriters: Means, collectively, Credit Suisse Securities (USA) LLC,
Citigroup Global Markets Inc., Goldman Sachs & Co. LLC, Deutsche Bank Securities Inc., Morgan Stanley & Co. LLC, Barclays Capital Inc., Merrill Lynch, Pierce, Fenner & Smith Incorporated, BNP Paribas Securities Corp.,
Credit Agricole Securities (USA) Inc., J.P. Morgan Securities LLC, Standard Chartered Bank and Wells Fargo Securities, LLC. 

Underwriting Agreement: Means the Underwriting Agreement related to the Applicable Certificates dated January 31,
2018 among Credit Suisse Securities (USA) LLC and Citigroup Global Markets Inc., as representatives of the several Underwriters, the Company and the Depositary, as the same may be amended, supplemented or otherwise modified from time to time in
accordance with its terms. 
 United Bankruptcy Event: Has the meaning specified in the Intercreditor Agreement. 

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

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

(ii) The amount of such distribution under the Agreement allocable to principal and the amount allocable to premium (including
Make-Whole Amount), if any; 
 (iii) The amount of such distribution under the Agreement allocable to interest; 

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

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

(vi) The Pool Balance and the Pool Factor. 

With respect to the Applicable Certificates registered in the name of a Clearing Agency or its nominee, on the Record Date prior to each
Distribution Date, the Trustee will request that such Clearing Agency post on its Internet bulletin board a securities position listing 

  
 11 

 
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), (a)(iii), (a)(iv) and (a)(v) above for such calendar year or, in the event such Person was an Applicable Certificateholder of record during a portion of such calendar year, for such portion of such year, and such other items as are
readily available to the Trustee and which an Applicable Certificateholder shall reasonably request as necessary for the purpose of such Applicable Certificateholder’s preparation of its U.S. federal income tax returns. Such statement and such
other items shall be prepared on the basis of information supplied to the Trustee by the Clearing Agency Participants and shall be delivered by the Trustee to such Clearing Agency Participants to be available for forwarding by such Clearing Agency
Participants to the holders of interests in the Applicable Certificates in the manner described in Section 3.01(a) of this Trust Supplement. 

(c)    If the aggregate principal payments scheduled for a Regular Distribution Date prior to the Delivery Period
Termination Date differ from the amount thereof set forth for the Applicable Certificates on page S-37 of the Prospectus Supplement, by no later than the 15th day prior to such Regular Distribution Date, the
Trustee shall mail written notice of the actual amount of such scheduled payments to the Applicable Certificateholders of record as of a date within 15 Business Days prior to the date of mailing. 

(d)    Promptly following (i) the Delivery Period Termination Date, if there has been any change in the information
set forth in clauses (y) and (z) below from that set forth on page S-37 of the Prospectus Supplement, and (ii) the date of any early redemption of, or any default in the payment of principal or
interest in respect of, any of the Equipment Notes held in the Applicable Trust, or any Final Withdrawal, 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 Delivery Period Termination Date, (y) the related Pool Factors for such Regular Distribution Dates and (z) the expected principal payment schedule of the Equipment Notes, in the
aggregate, held as Trust Property at the date of such notice. With respect to the Applicable Certificates registered in the name of a Clearing Agency, on the Delivery Period Termination Date, 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. 

  
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 (f)     This Section 3.01 supersedes and replaces Section 4.03 of
the Basic Agreement, with respect to the Applicable Trust. 
 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 Equipment Notes held (subject to the Intercreditor Agreement) in the Applicable Trust or realized
upon the sale of such Equipment Notes, the Trustee shall distribute out of the Special Payments Account the entire amount of such Special Payment deposited therein pursuant to Section 3.02(a) of this Trust Supplement. There shall be so
distributed to each Applicable Certificateholder of record on the Record Date with respect to such Special Distribution Date (other than as provided in Section 7.01 of this Trust Supplement concerning the final distribution) by check mailed to
such Applicable Certificateholder, at the address appearing in the Register, such Applicable Certificateholder’s pro rata share (based on the Fractional Undivided Interest in the Applicable Trust held by such Applicable
Certificateholder) of the total amount in the Special Payments Account on account of such Special Payment, except that, with respect to Applicable Certificates registered on the Record Date in the name of a Clearing Agency (or its nominee), such
distribution shall be made by wire transfer in immediately available funds to the account designated by such Clearing Agency (or such nominee). 

(b)    The Trustee shall, at the expense of the Company, cause notice of each Special Payment to be mailed to each
Applicable Certificateholder at his address as it appears in the Register. In the event of redemption or purchase of Equipment Notes held in the Applicable Trust, such notice shall be mailed not less than 15 days prior to the Special Distribution
Date for the Special Payment resulting from such redemption or purchase, which Special Distribution Date shall be the date of such redemption or purchase. In the case of any other Special Payments, such notice shall be mailed as soon as practicable
after the Trustee has confirmed that it has received funds for such Special Payment, stating the Special Distribution Date for such Special Payment which shall occur not less than 15 days after the date of such notice and as soon as practicable
thereafter. Notices with respect to a Special Payment mailed by the Trustee shall set forth: 

(i)    The Special Distribution Date and the Record Date therefor (except as otherwise provided in
Section 7.01 of this Trust Supplement), 

  
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 (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 an 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 Equipment Notes held in
the Applicable Trust is canceled, the Trustee, as soon as possible after learning thereof, shall cause notice thereof to be mailed to each Applicable Certificateholder at its address as it appears on the Register. 

(c)     This Section 3.03 supersedes and replaces Section 4.02(b) and Section 4.02(c) of the Basic
Agreement in their entirety, with respect to the Applicable Trust. 
 Section 3.04. Limitation of Liability for Payments.
Section 3.09 of the Basic Agreement shall be amended, with respect to the Applicable Trust, by deleting the phrase “the Owner Trustees or the Owner Participants” in the second sentence thereof and adding in lieu thereof “the
Liquidity Provider”. 
 ARTICLE IV 

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

(i)     So long as no Additional Certificateholder has elected to exercise its rights to purchase
Certificates pursuant to, and given notice of such election in accordance with, this Section 4.01(a) (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
Class A 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 Applicable Certificates upon
15 days’ written notice to the Trustee and each other Class A 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 Class A Certificateholder (other than the 

  
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Company or any of its Affiliates) notifies such purchasing Class A Certificateholder that such other Class A Certificateholder wants to participate in such purchase, then such other
Class A Certificateholder (other than the Company or any of its Affiliates) may join with the purchasing Class A Certificateholder to purchase all, but not less than all, of the Applicable Certificates pro rata based on the Fractional
Undivided Interest in the Class A Trust held by each such Class A Certificateholder and (B) if prior to the end of such 15-day period any other Class A Certificateholder fails to notify the
purchasing Class A Certificateholder of such other Class A Certificateholder’s desire to participate in such a purchase, then such other Class A Certificateholder shall lose its right to purchase the Applicable Certificates
pursuant to this Section 4.01(a)(i); 
 (ii)    If any Additional Certificates are issued pursuant
to one or more Additional Trusts, each Additional Certificateholder (other than the Company or any of its Affiliates) shall have the right (which shall not expire upon any purchase of the Applicable 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)(ii); and 
 (iii)    If any Refinancing Certificates are issued,
each Refinancing Certificateholder shall have the same right (subject to the same terms and conditions) to purchase Certificates pursuant to this Section 4.01(a) (and to receive notice in connection therewith) as the Certificateholders of the
Class that such Refinancing Certificates refinanced. 
 The purchase price with respect to the Applicable Certificates shall be equal
to the Pool Balance of the Applicable Certificates, together with accrued and unpaid interest thereon to the date of such purchase, without premium (including Make-Whole Amount), but including any 

  
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other amounts then due and payable to the Applicable Certificateholders under the Agreement, the Intercreditor Agreement, the Escrow Agreement or any Note Document or on or in respect of 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 (unless such purchaser is a Class A Certificateholder) 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 Class A Certificateholder(s), Additional Certificateholder(s) or Refinancing Certificateholder(s), as the case may be, of the purchase price set forth in the first
sentence of this paragraph, (i) forthwith sell, assign, transfer and convey to the purchaser(s) thereof (without recourse, representation or warranty of any kind except for its own acts), all of the right, title, interest and obligation of such
Applicable Certificateholder in the Agreement, the Escrow Agreement, the Deposit Agreement, the Intercreditor Agreement, the Liquidity Facility, the NPA, the Note Documents and all Applicable Certificates and Escrow Receipts held by such Applicable
Certificateholder (excluding all right, title and interest under any of the foregoing to the extent such right, title or interest is with respect to an obligation not then due and payable as respects any action or inaction or state of affairs
occurring prior to such sale) (and the purchaser shall assume all of such Applicable Certificateholder’s obligations under the Agreement, the Escrow Agreement, the Deposit Agreement, the Intercreditor Agreement, the Liquidity Facility, the NPA,
the Note Documents and all such Applicable Certificates and Escrow Receipts), (ii) if such purchase occurs after a record date specified in Section 2.03 of the Escrow Agreement relating to the distribution of unused Deposits and/or accrued and
unpaid interest on Deposits and prior to or on the related distribution date thereunder, forthwith turn over to the purchaser(s) of its Applicable Certificate all amounts, if any, received by it on account of such distribution, and (iii) if
such purchase occurs after a Record Date relating to any distribution and prior to or on the related Distribution Date, forthwith turn over to the purchaser(s) of its Applicable Certificate all amounts, if any, received by it on account of such
distribution. The Applicable Certificates will be deemed to be purchased on the date payment of the purchase price is made notwithstanding the failure of the Applicable Certificateholders to deliver any Applicable Certificates and, upon such a
purchase, (I) the only rights of the Applicable Certificateholders will be to deliver the Applicable Certificates to the purchaser(s) and receive the purchase price for such Applicable Certificates and (II) if the purchaser(s) shall so
request, such Applicable Certificateholder will comply with all the provisions of Section 3.04 of the Basic Agreement to enable new Applicable Certificates to be issued to the purchaser in such denominations as it shall request. All charges and
expenses in connection with the issuance of any such new Applicable Certificates shall be borne by the purchaser thereof. 
 As used in this
Section 4.01 and elsewhere in this Trust Supplement, the terms “Additional Certificate”, “Additional Certificateholder”, “Additional Equipment Notes”, “Additional Trust”, “Class A
Certificate”, “Class A Certificateholder”, “Class A Trust”, “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. 

  
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 (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, the Escrow 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 maximum aggregate principal amount of Equipment Notes 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)    After the
Issuance Date, the Company may deliver from time to time to the Trustee a Closing Notice relating to one or more Equipment Notes. After receipt of a Closing Notice and in any case no later than one Business Day prior to a Scheduled Closing Date as
to which such Closing Notice relates (the “Applicable Closing Date”), the Trustee shall (as and when specified in the Closing Notice) instruct the Escrow Agent to provide a Notice of Purchase Withdrawal to the Depositary requesting
(i) the withdrawal of one or more Deposits on the Applicable Closing Date in accordance with and to the extent permitted by the terms of the Escrow Agreement and the Deposit Agreement and (ii) the payment of all, or a portion, of such
Deposit or Deposits in an amount equal in the aggregate to the purchase price of such Equipment Notes to or on behalf of the Company, all as shall be described in the Closing Notice. The Trustee shall (as and when specified in such Closing Notice),
subject to the conditions set forth in Section 2 of the NPA, enter into and perform its obligations under the Participation Agreement specified in such Closing Notice (the “Applicable Participation Agreement”) and cause such
certificates, documents and legal opinions relating to the Trustee to be duly delivered as required by the Applicable Participation Agreement. If at any time prior to the Applicable Closing Date, the Trustee receives a notice of postponement
pursuant to Section 1(e) or 1(f) of the NPA, then 

  
 17 

 
the Trustee shall give the Depositary (with a copy to the Escrow Agent) a notice of cancellation of such Notice of Purchase Withdrawal relating to such Deposit or Deposits on such Applicable
Closing Date. Upon satisfaction of the conditions specified in the NPA and the Applicable Participation Agreement, the Trustee shall purchase the applicable Equipment Notes with the proceeds of the withdrawals of one or more Deposits made on the
Applicable Closing Date in accordance with the terms of the Deposit Agreement and the Escrow Agreement. The purchase price of such Equipment Notes shall equal the principal amount of such Equipment Notes. Amounts withdrawn from such Deposit or
Deposits in excess of the purchase price of the Equipment Notes or to the extent not applied on the Applicable Closing Date to the purchase price of the Equipment Notes, shall be re-deposited by the Trustee
with the Depositary on the Applicable Closing Date in accordance with the terms of the Deposit Agreement. 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, the NPA and each Applicable Participation Agreement, 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. 

Section 5.02. Withdrawal of Deposits. If any Deposits remain outstanding on the Business Day next succeeding the Cut-off Date, the Trustee shall promptly give the Escrow Agent notice that the Trustee’s obligation to purchase Equipment Notes under the NPA has terminated and instruct the Escrow Agent to provide a notice of
Final Withdrawal to the Depositary substantially in the form of Exhibit B to the Deposit Agreement (the “Final Withdrawal Notice”). 

Section 5.03. The Trustee. (a) Subject to Section 5.04 of this Trust Supplement and Section 7.15 of the Basic
Agreement, the Trustee shall not be responsible in any manner whatsoever for or in respect of the validity or sufficiency of this Trust Supplement, the Deposit Agreement, the NPA or the Escrow Agreement or the due execution hereof or thereof by the
Company or the other parties thereto (other than the Trustee), or for or in respect of the recitals and statements contained herein or therein, all of which recitals and statements are made solely by the Company, except that the Trustee hereby
represents and warrants that each of this Trust Supplement, the Basic Agreement, each Applicable Certificate, the Intercreditor Agreement, the NPA and the Escrow Agreement has been executed and delivered by one of its officers who is duly authorized
to execute and deliver such document on its behalf. 
 (b)    Except as herein otherwise provided and except during the
continuation of an Event of Default in respect of the Applicable Trust created hereby, no duties, responsibilities 

  
 18 

 
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 Escrow 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 Escrow 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 Escrow 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; 

(c)    The execution, delivery and performance by the Trustee of this Trust Supplement, the Intercreditor
Agreement, the Escrow Agreement, the NPA and the Note Documents to which it is or is to become a party 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 Escrow 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. 

  
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 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, under the terms of, and subject to the limitations contained in, Section 9.01 of the Basic Agreement, the Company may (but will not be required to), and the Trustee (subject to
Section 9.03 of the Basic Agreement) shall, at the Company’s request, at any time and from time to time: 

(i)    Enter into one or more agreements supplemental to the Escrow Agreement, the NPA or the Deposit Agreement for any of
the purposes set forth in clauses (1) through (9) of such Section 9.01, and (without limitation of the foregoing or Section 9.01 of the Basic Agreement) (a) clauses (2) and (3) of such Section 9.01 shall also be deemed
to include the Company’s obligations under (in the case of clause (2)), and the Company’s rights and powers conferred by (in the case of clause (3)), the NPA, and (b) references in clauses (4), (6) and (7) of such
Section 9.01 to “any Intercreditor Agreement or any Liquidity Facility” shall also be deemed to refer to “the Intercreditor Agreement, the Liquidity Facility, the Escrow Agreement, the NPA or the Deposit Agreement”, 

(ii)    Enter into one or more agreements supplemental to the Agreement, the Intercreditor Agreement or the NPA to provide
for the formation of one or more Additional Trusts, the issuance of Additional Certificates, the purchase by an Additional Trust (if any) of applicable Additional Equipment Notes and other matters incidental thereto or otherwise contemplated by
Section 2.01(b) of the Basic Agreement, subject to the provisions of Section 4(a)(vi) of the NPA and Section 9.1(d) of the Intercreditor Agreement, and 

(iii)    Enter into one or more agreements supplemental to the Agreement to provide for the formation of one or more
Refinancing Trusts, the issuance of Refinancing Certificates, the purchase by any Refinancing Trust of applicable Refinancing Equipment Notes and other matters incidental thereto or as otherwise contemplated by Section 2.01(b) of the Basic
Agreement, subject to the provisions of Section 4(a)(vi) of the NPA and Section 9.1(c) of the Intercreditor Agreement. 

  
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 Section 6.03. Supplemental Agreements with Consent of Applicable Certificateholders.
Without limitation of Section 9.02 of the Basic Agreement, the provisions of Section 9.02 of the Basic Agreement shall apply to agreements or amendments for the purpose of adding any provisions to or changing in any manner or eliminating
any of the provisions of the Escrow Agreement, the Deposit Agreement, the Liquidity Facility or the NPA or modifying in any manner the rights and obligations of the Applicable Certificateholders under the Escrow Agreement, the Deposit Agreement, the
Liquidity Facility or the NPA; provided that the provisions of Section 9.02(1) of the Basic Agreement shall be deemed to include reductions in any manner of, or delay in the timing of, any receipt by the Applicable Certificateholders of
payments upon the Deposits. 
 Section 6.04. Consent of Holders of Certificates Issued under Other Trusts. Notwithstanding any
provision in Section 6.02 or Section 6.03 of this Trust Supplement to the contrary, no amendment or modification of Section 4.01 of this Trust Supplement shall be effective unless the trustee for each Class of Certificates
affected by such amendment or modification shall have consented thereto. 
 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 earlier of (i) the completion of the assignment, transfer and discharge described in the first sentence of the immediately following paragraph and (ii) 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. 

Upon the earlier of (i) the first Business Day following August 31, 2018 or, if later, the fifth Business Day following the Delivery
Period Termination Date and (ii) the fifth Business Day following the date on which a Triggering Event occurs (such date, the “Transfer Date”), or, if later, the date on which all of the conditions set forth in the immediately
following sentence have been satisfied, the Trustee is hereby directed (subject only to the immediately following sentence) to, and the Company shall direct the institution that will serve as the Related Trustee under the Related Pass Through Trust
Agreement to, execute and deliver the Assignment and Assumption Agreement, pursuant to which the Trustee shall assign, transfer and deliver all of the Trustee’s right, title and interest to the Trust Property to the Related Trustee under the

  
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Related Pass Through Trust Agreement. The Trustee and the Related Trustee shall execute and deliver the Assignment and Assumption Agreement upon the satisfaction of the following conditions: 

(i)    The Trustee, the Related Trustee and each of the Rating Agencies then rating the Applicable Certificates shall have
received an Officer’s Certificate and an Opinion of Counsel dated the date of the Assignment and Assumption Agreement and each satisfying the requirements of Section 1.02 of the Basic Agreement, which Opinion of Counsel shall be
substantially to the effect set forth below and may be relied upon by the Beneficiaries (as defined in the Assignment and Assumption Agreement): 

(I)    Upon the execution and delivery thereof by the parties thereto in accordance with the terms of the
Agreement and the Related Pass Through Trust Agreement, the Assignment and Assumption Agreement will constitute the valid and binding obligation of each of the parties thereto enforceable against each such party in accordance with its terms; 

(II)    Upon the execution and delivery of the Assignment and Assumption Agreement in accordance with the
terms of the Agreement and the Related Pass Through Trust Agreement, each of the Applicable Certificates then Outstanding will be entitled to the benefits of the Related Pass Through Trust Agreement; 

(III)    The Related Trust is not required to be registered as an investment company under the Investment
Company Act of 1940, as amended; 
 (IV)    The Related Pass Through Trust Agreement constitutes the
valid and binding obligation of the Company enforceable against the Company in accordance with its terms; and 

(V)    Neither the execution and delivery of the Assignment and Assumption Agreement in accordance with the
terms of the Agreement and the Related Pass Through Trust Agreement, nor the consummation by the parties thereto of the transactions contemplated to be consummated thereunder on the date thereof, will violate any law or governmental rule or
regulation of the State of New York or the United States of America known to such counsel to be applicable to the transactions contemplated by the Assignment and Assumption Agreement. 

(ii)    The Trustee and the Company shall have received (x) a copy of the articles of incorporation
and bylaws of the Related Trustee certified as of the Transfer Date by the Secretary or Assistant Secretary of such institution and (y) a copy of the filing (including all attachments thereto) made by the institution serving as the Related
Trustee with the Office of the Superintendent, State of New York Banking Department for the qualification of the Related Trustee under Section 131(3) of the New York Banking Law, if applicable to such Related Trustee. 

Upon the execution of the Assignment and Assumption Agreement by the parties thereto, the Applicable Trust shall be terminated, the Applicable
Certificateholders shall receive beneficial interests in the Related Trust in exchange for their interests in the Applicable Trust 

  
 22 

 
equal to their respective beneficial interests in the Applicable Trust, and the Outstanding Applicable Certificates representing Fractional Undivided Interests in the Applicable Trust shall be
deemed for all purposes of the Agreement and the Related Pass Through Trust Agreement, without further signature or action of any party or Applicable Certificateholder, to be certificates representing the same Fractional Undivided Interests in the
Related Trust and its trust property. By acceptance of its Applicable Certificate, each Applicable Certificateholder consents to such assignment, transfer and delivery of the Trust Property to the trustee of the Related Trust upon the execution and
delivery of the Assignment and Assumption Agreement. 
 In connection with the occurrence of the event set forth in clause (B) above of
the first paragraph of this Section 7.01(a), 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 to each Loan Trustee the appropriate amount of money
relating to such Loan Trustee and shall give written notice thereof to the Company. 
 (b)    The provisions of this
Section 7.01 supersede and replace the provisions of Section 11.01 of the Basic Agreement in its entirety, with respect to the Applicable Trust. 

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 

  
 23 

 
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, UNTIL THE TRANSFER DATE, THE APPLICABLE CERTIFICATES SHALL BE GOVERNED BY AND
CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF DELAWARE. 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. 

  
 24 

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

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

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

		 	Name:	 	Chad May
		 	Title:	 	Assistant Vice President

  
 Signature Page - Trust
Supplement 2018-1AA-O 

 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 2018-1AA-O 
 United Airlines
Pass Through Certificate, Series 2018-1AA-O 
 Issuance Date:
February 14, 2018 
 Final Maturity Date: September 1, 2031 

Evidencing A Fractional Undivided Interest In The United Airlines Pass Through Trust 2018-1AA-O, The Property Of Which Shall Include Certain Equipment Notes Each Secured By An Aircraft Owned By United Airlines, Inc. 

$[        ] Fractional Undivided Interest 

representing 0.000147672% 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 2018-1AA-O (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. 2018-1AA-O thereto, dated as of
February 14, 2018 (the “Trust Supplement” and, together 
  

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

  
 A-1 

 
with the Basic Agreement, the “Agreement”), between the Trustee and the Company, a summary 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 2018-1AA-O” (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 certain Equipment Notes and all rights of the Trust to receive payments under the Intercreditor Agreement and the Liquidity Facility
(the “Trust Property”). Each issue of the Equipment Notes is secured by, among other things, a security interest in an Aircraft owned by the Company. 

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 March 1 and September 1 of each year (a “Regular Distribution Date”) commencing September 1, 2018, 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 Equipment Notes 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
Equipment Notes 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 Equipment Notes, 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 

  
 A-2 

 
distribution on this Certificate will be made after notice mailed by the Trustee of the pendency of 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. 

Under certain circumstances set forth in Section 7.01 of the Trust Supplement, all of the Trustee’s right, title and interest to the
Trust Property may be assigned, transferred and delivered to the Related Trustee of the Related Trust pursuant to the Assignment and Assumption Agreement. Upon the effectiveness of such Assignment and Assumption Agreement (the
“Transfer”), the Trust shall be terminated, the Certificateholders shall receive beneficial interests in the Related Trust in exchange for their interests in the Trust equal to their respective beneficial

  
 A-3 

 
interests in the Trust, the Certificates representing Fractional Undivided Interests in the Trust shall be deemed for all purposes of the Agreement and the Related Pass Through Trust Agreement to
be certificates representing the same Fractional Undivided Interests in the Related Trust and its trust property. Each Certificateholder, by its acceptance of this Certificate or a beneficial interest herein, agrees to be bound by the Assignment and
Assumption Agreement and subject to the terms of the Related Pass Through Trust Agreement as a Certificateholder thereunder. From and after the Transfer, unless and to the extent the context otherwise requires, references herein to the Trust, the
Agreement and the Trustee shall constitute references to the Related Trust, the Related Pass Through Trust Agreement and trustee of the Related Trust, respectively. 

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. 

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 

  
 A-4 

 
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. 
 Any Person who is an employee benefit plan subject to Title I of ERISA, a plan subject to Section 4975
of the Code, or an entity whose underlying assets are deemed to include “plan assets” by reason of such a plan’s investment in such entity (a “Benefit Plan Investor”) and is acquiring or accepting 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, the Underwriters and their respective affiliates that (i) the decision to acquire or accept this
Certificate or an interest herein has been made by a duly authorized fiduciary of the Benefit Plan Investor that (A) is independent (as that term is used in 29 C.F.R. 2510.3-21(c)(1)) of the Company, each
of the Underwriters, and their respective affiliates; (B) is a bank, an insurance carrier, a registered investment adviser, a registered broker-dealer, or an independent fiduciary that holds, or has under management or control, total
assets of at least $50 million (in each case, as specified in 29 C.F.R. 2510.3-21(c)(1)(i)(A)-(E)); (C) is capable of evaluating investment risks independently, both in general and with regard to
particular transactions and investment strategies (including, without limitation, with respect to the decision to acquire or accept this Certificate or an interest herein); (D) has been fairly informed that the Company, the Underwriters, and their
respective affiliates have not and will not undertake to provide impartial investment advice, or to give advice in a fiduciary capacity, in connection with the acquisition or acceptance of this Certificate or an interest herein; (E) has been
fairly informed of the existence and nature of the financial interests that the Company, the Underwriters, and their respective affiliates have in the Benefit Plan Investor’s acquisition or acceptance of this Certificate or an interest herein,
which interests may conflict with the interest of the Benefit Plan Investor, as more fully described in the offering materials; and (F) is a fiduciary under ERISA or the Code, or both, with respect to the decision to acquire or accept this
Certificate or an interest herein and is responsible for exercising (and has exercised) independent judgment in evaluating whether to invest the assets of such Benefit Plan Investor in this Certificate or an interest herein; and (ii) neither
the Benefit Plan Investor nor such duly authorized fiduciary of the Benefit Plan Investor is paying the Company, any Underwriter, or any of their respective affiliates, any fee or other compensation directly for the provision of investment advice
(as opposed to other services) in connection with the Benefit Plan Investor’s acquisition or acceptance of this Certificate or an interest herein. 

THE AGREEMENT AND, UNTIL THE TRANSFER, THIS CERTIFICATE SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF
DELAWARE AND THE OBLIGATIONS, RIGHTS AND REMEDIES OF THE PARTIES HEREUNDER SHALL BE DETERMINED IN ACCORDANCE WITH SUCH LAWS. THE RELATED PASS THROUGH TRUST AGREEMENT AND, FROM AND AFTER THE TRANSFER, THIS CERTIFICATE SHALL BE GOVERNED AND CONSTRUED
IN ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK AND THE OBLIGATIONS, RIGHTS AND REMEDIES OF THE PARTIES HEREUNDER SHALL BE DETERMINED IN ACCORDANCE WITH SUCH LAWS. 

  
 A-5 

 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. 

  
 A-6 

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

 

			
	UNITED AIRLINES PASS THROUGH TRUST 2018-1AA-O
		
	By:	 	WILMINGTON TRUST, NATIONAL ASSOCIATION,
		 	as Trustee
		
	By:	 	
                     
                    

		 	Name:
		 	Title:

  
 A-7 

 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:

  
 A-8 

 EXHIBIT B 

[DTC Letter of Representations] 

 EXHIBIT C 

FORM OF ASSIGNMENT AND ASSUMPTION AGREEMENT 

United Airlines Pass Through Trust 2018-1AA-O 

ASSIGNMENT AND ASSUMPTION AGREEMENT (2018-1AA-O), dated
             ,          (the “Assignment Agreement”), between Wilmington Trust, National Association, a national banking association
(“WTNA”), not in its individual capacity except as expressly provided herein, but solely as trustee under the Pass Through Trust Agreement dated as of October 3, 2012 (as amended or modified from time to time, the “Basic
Agreement”), as supplemented by the Trust Supplement No. 2018-1AA-O, dated as of February 14, 2018 (the “Trust Supplement” and together with the Basic
Agreement, the “Agreement”) in respect of the United Airlines Pass Through Trust 2018-1AA-O (the “Assignor”), and Wilmington Trust, National
Association, a national banking association, not in its individual capacity except as expressly provided herein, but solely as trustee under the Basic Agreement, as supplemented by the Trust Supplement No. 2018-1AA-S, dated as of February 14, 2018 (the “New Supplement”, and, together with the Basic Agreement, the “New Agreement”) in respect of the United Airlines Pass Through Trust 2018-1AA-S (the “Assignee”). 
 W I T N E S S E T H: 

WHEREAS, the parties hereto desire to effect on the date hereof (the “Transfer Date”) (a) the transfer by the Assignor to the
Assignee of all of the right, title and interest of the Assignor in, under and with respect to, among other things, the Trust Property and each of the documents listed in Schedule I hereto (the “Scheduled Documents”) and (b) the
assumption by the Assignee of the obligations of the Assignor (i) under the Scheduled Documents and (ii) in respect of the Applicable Certificates issued under the Agreement; and 

WHEREAS, the Scheduled Documents permit such transfer upon satisfaction of certain conditions heretofore or concurrently herewith being
complied with; 
 NOW, THEREFORE, in consideration of the premises and of the mutual covenants and agreements herein contained, the parties
hereto do hereby agree as follows (capitalized terms used herein without definition having the meaning ascribed thereto in the Agreement): 

1.    Assignment. The Assignor does hereby sell, assign, convey, transfer and set over unto the Assignee as of the
Transfer Date all of its present and future right, title and interest in, under and with respect to the Trust Property and the Scheduled Documents and each other contract, agreement, document or instrument relating to the Trust Property or the
Scheduled Documents (such other contracts, agreements, documents or instruments, together with the Scheduled Documents, to be referred to as the “Assigned Documents”), and any proceeds therefrom, together with all documents and instruments
evidencing any of such right, title and interest. 

  
 C-1 

 2.    Assumption. The Assignee hereby assumes for the benefit of the
Assignor and each of the parties listed in Schedule II hereto (collectively, the “Beneficiaries”) all of the duties and obligations of the Assignor, whenever accrued, pursuant to the Assigned Documents and hereby confirms that it shall be
deemed a party to each of the Assigned Documents to which the Assignor is a party and shall be bound by all the terms thereof (including the agreements and obligations of the Assignor set forth therein) as if therein named as the Assignor. Further,
the Assignee hereby assumes for the benefit of the Assignor and the Beneficiaries all of the duties and obligations of the Assignor under the Outstanding Applicable Certificates and hereby confirms that the Applicable Certificates representing
Fractional Undivided Interests under the Agreement shall be deemed for all purposes of the Agreement and the New Agreement to be certificates representing the same Fractional Undivided Interests under the New Agreement equal to their respective
beneficial interests in the trust created under the Agreement. 
 3.    Effectiveness. This Assignment Agreement
shall be effective upon the execution and delivery hereof by the parties hereto, and each Applicable Certificateholder, by its acceptance of its Applicable Certificate or a beneficial interest therein, agrees to be bound by the terms of this
Assignment Agreement. 
 4.    Payments. The Assignor hereby covenants and agrees to pay over to the Assignee, if
and when received following the Transfer Date, any amounts (including any sums payable as interest in respect thereof) paid to or for the benefit of the Assignor that, under Section 1 hereof, belong to the Assignee. 

5.    Further Assurances. The Assignor shall, at any time and from time to time, upon the request of the Assignee,
promptly and duly execute and deliver any and all such further instruments and documents and take such further action as the Assignee may reasonably request to obtain the full benefits of this Assignment Agreement and of the rights and powers herein
granted. The Assignor agrees to deliver any Applicable Certificates, and all Trust Property, if any, then in the physical possession of the Assignor, to the Assignee. 

6.    Representations and Warranties. (a) The Assignee represents and warrants to the Assignor and each of the
Beneficiaries that: 
 (i)    it has all requisite power and authority and legal right to enter into and
carry out the transactions contemplated hereby and to carry out and perform the obligations of the “Pass Through Trustee” under the Assigned Documents; 

(ii)    on and as of the date hereof, the representations and warranties of the Assignee set forth in
Section 7.15 of the Basic Agreement and Section 5.04 of the New Supplement are true and correct. 

  
 C-2 

 (b)    The Assignor represents and warrants to the Assignee that: 

(i)    it is duly incorporated, validly existing and in good standing under the laws of the United States
and has the full trust power, authority and legal right under the laws of the United States and of the state of the United States in which it is located pertaining to its trust and fiduciary powers to execute and deliver this Assignment Agreement;

 (ii)    the execution and delivery by it of this Assignment Agreement and the performance by it of its
obligations hereunder have been duly authorized by it and will not violate its articles of association or by-laws or the provisions of any indenture, mortgage, contract or other agreement to which it is a
party or by which it is bound; and 
 (iii)    this Assignment Agreement constitutes the legal, valid and
binding obligations of it enforceable against it in accordance with its terms, except as the same may be limited by applicable bankruptcy, insolvency, reorganization, moratorium or similar laws affecting the rights of creditors generally and by
general principles of equity, whether considered in a proceeding at law or in equity. 
 7.    GOVERNING
LAW. THIS ASSIGNMENT AGREEMENT SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK INCLUDING MATTERS OF CONSTRUCTION, VALIDITY AND PERFORMANCE. 

8.    Counterparts. This Assignment Agreement may be executed in any number of counterparts, all of which together
shall constitute a single instrument. It shall not be necessary that any counterpart be signed by both parties so long as each party shall sign at least one counterpart. 

9.    Third Party Beneficiaries. The Assignee hereby agrees, for the benefit of the Beneficiaries, that its
representations, warranties and covenants contained herein are also intended to be for the benefit of each Beneficiary, and each Beneficiary shall be deemed to be an express third party beneficiary with respect thereto, entitled to enforce directly
and in its own name any rights or claims it may have against such party as such beneficiary. 
 10.    Notice.
Promptly following the Transfer Date, the Assignee shall notify the Depositary of the occurrence of the assignment hereunder and the name and contact information of the Assignee. 

  
 C-3 

 IN WITNESS WHEREOF, the parties hereto, through their respective officers thereunto duly
authorized, have duly executed this Assignment Agreement as of the day and year first above written. 
  

							
		 	ASSIGNOR:	 	
			
		 		 	WILMINGTON TRUST, NATIONAL ASSOCIATION, not in its individual capacity except as expressly provided herein, but solely as trustee under the Pass Through Trust Agreement and Trust Supplement in respect of the United
Airlines Pass Through Trust 2018-1AA-O
			
		 	By:	 	
                     
                                        

		 		 	Name:	 	
		 		 	Title:	 	
			
		 	ASSIGNEE:	 	
			
		 		 	WILMINGTON TRUST, NATIONAL ASSOCIATION, not in its individual capacity except as expressly provided herein, but solely as trustee under the Pass Through Trust Agreement and Trust Supplement in respect of the United
Airlines Pass Through Trust 2018-1AA-S
			
		 	By:	 	
                     
                    

		 		 	Name:	 	
		 		 	Title:	 	

  
 C-4 

 Schedule I 

Schedule of Assigned Documents 

(1) Intercreditor Agreement dated as of February 14, 2018 among the Trustee, the Other Trustees party thereto, the Liquidity Provider and the
Subordination Agent. 
 (2) Escrow and Paying Agent Agreement (Class AA) dated as of February 14, 2018 among the Escrow Agent, the
Underwriters, the Trustee and the Escrow Paying Agent. 
 (3) Note Purchase Agreement dated as of February 14, 2018 among the Company, the
Trustee, the Other Trustees party thereto, the Subordination Agent, the Escrow Agent and the Escrow Paying Agent. 
 (4) Deposit Agreement
(Class AA) dated as of February 14, 2018 between the Escrow Agent and the Depositary. 
 (7) Each of the Operative Agreements (as defined in
the Participation Agreement for each Aircraft) in effect as of the Transfer Date. 

  
 C-5 

 Schedule II 

Schedule of Beneficiaries 
 Wilmington Trust,
National Association, not in its individual capacity but solely as Subordination Agent 
 Wilmington Trust, National Association, not in its individual
capacity but solely as Paying Agent 
 National Australia Bank Limited, acting through its New York Branch, as Liquidity Provider 

Citibank, N.A., as Depositary 
 United Airlines, Inc. 

Credit Suisse Securities (USA) LLC, as Underwriter 
 Citigroup
Global Markets Inc., as Underwriter 
 Goldman Sachs & Co. LLC, as Underwriter 

Deutsche Bank Securities Inc., as Underwriter 
 Morgan
Stanley & Co. LLC, as Underwriter 
 Barclays Capital Inc., as Underwriter 

Merrill Lynch, Pierce, Fenner & Smith Incorporated, as Underwriter 

BNP Paribas Securities Corp., as Underwriter 
 Credit Agricole
Securities (USA) Inc., as Underwriter 
 J.P. Morgan Securities LLC, as Underwriter 

Standard Chartered Bank, as Underwriter 
 Wells Fargo Securities,
LLC., as Underwriter 
 U.S. Bank National Association, as Escrow Agent 

Each of the other parties to the Assigned Documents 

  
 C-6

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