Supplemental Agreement No. 10 to Purchase Agreement No. 04761 between The Boeing Company and United Airlines, Inc., dated June 30, 2022

THIS SUPPLEMENTAL AGREEMENT No. 10 (SA-10) , entered into as of June 30, 2022, by and between The Boeing Company, a Delaware corporation, (Boeing) and United Airlines, Inc., a Delaware corporation, (Customer);

WHEREAS, Customer and Boeing entered into Purchase Agreement No. 04761 dated as of the 15th day of May of 2018 as amended and supplemented (Purchase Agreement), relating to the purchase and sale of Model 737 MAX aircraft. This Supplemental Agreement is an amendment to the Purchase Agreement; and

WHEREAS, solely to conform and further amend the Purchase Agreement to reflect Customer and Boeing’s agreement regarding the following matters without duplication of any consideration being provided to Customer to:

(i)*** 737-*** Aircraft as shown in the table below:

(ii)*** the scheduled delivery *** 737-*** Aircraft as shown in the table below:

(iii)*** the scheduled delivery *** Aircraft as shown in the table below:

(iv)specify the *** to be used to calculate the *** for each Aircraft *** under this SA-10;

(v)revise the *** terms applicable to *** Aircraft specified as follows:

a.*** 737-*** Aircraft *** 737-*** Aircraft i as specified in the first SA-10 recital;

b.*** 737-*** Aircraft *** 737-*** Aircraft as specified in the first SA-10 recital.

NOW THEREFORE, in consideration of the mutual covenants herein contained, the parties agree to amend the Purchase Agreement as follows:

The “Table of Contents” is deleted in its entirety and replaced with the attached “Table of Contents” (identified by “SA-10”).

2.1.The Table 1 titled “*** 737-*** Aircraft Delivery, Description, Price and ***” is deleted in its entirety and replaced with the attached similarly titled Table 1 (identified by “SA-10”) to ***.

2.2.Table 1 titled “*** 737-*** Aircraft Delivery, Description, Price and ***” is deleted in its entirety and replaced with the attached similarly titled Table 1 (identified by “SA-10”) to ***.

2.3.Table 1 titled “737-*** Aircraft Delivery, Description, Price and ***” is deleted in its entirety and replaced with the attached similarly titled Table 1 (identified by “SA-10”) to ***.

2.4.Table 1 titled “*** 737-*** Aircraft Delivery, Description, Price and ***” is deleted in its entirety and replaced with the attached similarly titled Table 1 (identified by “SA-10”) to ***.

3.1.Letter Agreement No. UAL-PA-04761-LA-l807022R5 is deleted in its entirety and replaced with Letter Agreement No. UAL-PA-04761-LA-l807022R6 titled “*** Aircraft-737-***” (identified by “SA-10”) to reflect ***.

3.2.Letter Agreement No. UAL-PA-04761-LA-2100718R1 is deleted in its entirety and replaced with Letter Agreement No. UAL-PA-04761-LA-2100718R2 titled “***” (identified by “SA-10”) to ***.

The Purchase Agreement will be deemed supplemented to the extent provided herein as of the date hereof and as so supplemented will continue in full force and effect.

Subject:    *** Aircraft – 737-***

Reference:    Purchase Agreement No. PA-04761 (Purchase Agreement) between The Boeing Company (Boeing) and United Airlines, Inc. (Customer) relating to Model 737 MAX aircraft (Aircraft)

This letter agreement (Letter Agreement) amends and supplements the Purchase Agreement. All terms used but not defined in this Letter Agreement shall have the same meaning as in the Purchase Agreement. This Letter Agreement supersedes and replaces in its entirety Letter Agreement UAL-PA-04761-LA-1807022R5 dated June 27, 2021.

1.*** Aircraft.

Subject to the terms and conditions contained in this Letter Agreement, in addition to the Aircraft described in both Table 1’s to the Purchase Agreement as of the date of execution of this Letter Agreement, Customer will have the *** Model 737-*** aircraft as *** aircraft (*** Aircraft).

2.Delivery.

The number of aircraft and delivery months are listed in Attachment A-1 (Attachment A) to this Letter Agreement. The scheduled delivery position of each *** Aircraft listed in Attachment A provides the delivery schedule in *** consisting of a ***. No later than *** of Customer’s first *** Aircraft in each calendar year, Boeing will provide written notice with a *** Attachment A of the scheduled delivery month for each *** Aircraft with a *** in such calendar year.

3.Configuration.

3.1    Subject to the provisions of Article 3.2, below, the configuration for the *** Aircraft will be the Detail Specification for Boeing Model 737-*** aircraft, at the revision level in effect at the time of Definitive Agreement (as defined below). Such Detail Specification *** applicable to the Detail Specification that are developed by Boeing between the *** (as defined below) and the signing of the Definitive Agreement, (ii) changes required to obtain required regulatory certificates, and (iii) other changes as mutually agreed.

3.2 Subject to ***, the *** Aircraft ***, provided that it can achieve the *** which would result pursuant to the provisions of Article 3.1.

4.Price.

4.1The Airframe Price and *** Features Prices for each of the *** Aircraft is identified in Attachment A to this Letter Agreement.  ***.

4.2The Airframe Price, *** Features Prices, and Aircraft Basic Price for each of the *** Aircraft shall be adjusted in accordance with the terms set forth in ***.

4.3The *** Base Price shall be developed in accordance with the terms of the Purchase Agreement and determined at the time of Definitive Agreement.

(v.Payment.

5.1***

5.2Notwithstanding the amount shown in Attachment A, the *** Deposit will be *** for each *** Aircraft.

5.3At Definitive Agreement for the *** Aircraft, *** will be payable as specified in the Purchase Agreement. The remainder of the Aircraft Price for the *** Aircraft will be paid at the time of delivery.

6.***

6.1    Customer may *** by giving written notice to Boeing

6.1.1 Subject to ***, on or before the date ***; or

6.1.2 On or on or before the date *** (the date in Section 6.1.1 and in Section 6.1.2, as applicable, are referred to herein as the *** Date).

6.2    After receipt of Customer’s ***.

6.3    ***

7.Definitive Agreement.

Following Customer’s *** the parties will sign a definitive agreement for the purchase of such *** Aircraft (Definitive Agreement) ***. The Definitive Agreement will include the provisions of the Purchase Agreement as modified to reflect the provisions of this Letter Agreement. In the event the parties have not entered into a Definitive Agreement within ***, either party ***. If Customer and Boeing fail to enter into the Definitive Agreement, Boeing ***.    

8.Assignment.

Except as provided in Letter Agreement No. UAL-PA-04761-LA-1801472, the rights and obligations described in this Letter Agreement are provided to Customer in consideration of Customer’s becoming the operator of the Aircraft and cannot be assigned in whole or in part.

9.Confidential Treatment.

Customer and Boeing understand that certain commercial and financial information contained in this Letter Agreement are considered by Boeing and Customer as confidential and are subject to the terms and conditions set forth in Letter Agreement No. UAL-PA-04761-LA-1801470.

Subject:    Certain Special Matters for the *** Aircraft

Reference:    Purchase Agreement No.  04761 (Purchase Agreement) between The Boeing Company (Boeing) and United Airlines, Inc. (Customer) relating to Model 737 MAX aircraft (Aircraft)

This letter agreement (Letter Agreement) amends and supplements the Purchase Agreement. All terms used but not defined in this Letter Agreement shall have the same meaning as in the Purchase Agreement. This Letter Agreement supersedes and replaces in its entirety Letter Agreement UAL-PA-04761-LA-2100718R1 dated June 27, 2021.

1.Definitions.

*** Aircraft shall be comprised of each of the following Aircraft:

(i)    each of the *** 737-*** Aircraft specified in Table 1 titled “*** 737-*** Aircraft Delivery, Description, Price and ***” as of the date of this Letter Agreement (each an *** 737-*** Aircraft);

(ii)     each of the *** 737-*** Aircraft specified in Table 1 titled “737-*** Aircraft Delivery, Description, Price and ***” as of the date of this Letter Agreement (each an *** 737-*** Aircraft);

(iii)     each of the *** 737-*** Aircraft specified in Table 1 titled “*** 737-*** Aircraft Delivery, Description, Price and ***” (*** 737-*** Aircraft);

(iv) each of the *** 737-*** Aircraft specified in Table 1 titled “*** 737-*** Aircraft Delivery, Description, Price and ***” as of the date of this Letter Agreement (each an *** 737-*** Aircraft); and

(v) each 737-*** aircraft resulting from Customer’s *** in any of the *** 737-*** Aircraft scheduled for delivery in *** pursuant to Letter Agreement LA-1807022R6, including successors thereof, titled “*** Aircraft – 737-***” shall be an *** 737-*** Aircraft).

2.*** for the *** 737-*** Aircraft

In addition to the *** specified in Sections 1.3 and 1.4 of Letter Agreement UAL-PA-04761-LA-1801467R4, including successors thereof, titled “Special Matters - MAX Aircraft” (MAX Special Matters Letter), at the time of delivery Boeing shall ***.

3.*** Provisions for the *** 737-*** Aircraft.

3.1    In addition to the *** specified in Section 1.1 of the MAX Special Matters Letter, each *** 737-*** Aircraft will be eligible for the *** provided in this Section 3.

3.2    Customer has requested *** from Boeing on the ***.

3.3    In response to Customer’s requests ***.

3.4    As specified in Section 3.3, Customer shall purchase *** Aircraft specified in Attachment A to this Letter Agreement ***.

4.***

5.***

5.1*** 737-*** Aircraft. At the time of delivery of each *** 737-*** Aircraft, in addition to the *** specified in Section 1.1 of the MAX Special Matters Letter, Boeing shall ***.

5.2*** 737-*** Aircraft.

5.2.1    In addition to the *** specified in Section 1.1 of the MAX Special Matters Letter, each *** 737-*** Aircraft is eligible for the following ***:

6.***

7.Assignment.

Unless otherwise noted herein, the *** described in this Letter Agreement ***. Except as provided in Letter Agreement No. UAL-PA-04761-LA-1801472, this Letter Agreement cannot be assigned, in whole or in part, without the prior written consent of Boeing. ***.

8.Confidentiality.

Customer and Boeing understand that certain commercial and financial information contained in this Letter Agreement are considered by Boeing and Customer as confidential and are subject to the terms and conditions set forth in Letter Agreement No. UAL-PA-04761-LA-1801470.