Exhibit 10.8

6-1162-ELP-0777

United Air Lines, Inc.

PO Box 60100

Chicago, IL 60601-0100



|         |  |                                                                                                                                  
|-------- |  | ---------------------------------------------------------------------------------------------------------------------------------
|Subject: |  | Aircraft Model [CONFIDENTIAL MATERIAL OMITTED AND FILED SEPARATELY WITH THE SEC PURSUANT TO A REQUEST FOR CONFIDENTIAL TREATMENT]



|           |  |                                                                                                                                                                       
|---------- |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------
|Reference: |  | Purchase Agreement No. 3427 (Purchase Agreement) between The Boeing Company (Boeing) and United Air Lines, Inc. (Customer) relating to Model 787-8 aircraft (Aircraft)

This letter agreement (Letter Agreement) amends and supplements the Purchase Agreement. All terms used but not
defined in this Letter Agreement have the same meaning as in the Purchase Agreement.

Customer may [CONFIDENTIAL MATERIAL
OMITTED AND FILED SEPARATELY WITH THE SEC PURSUANT TO A REQUEST FOR CONFIDENTIAL TREATMENT], subject to the following terms and conditions:

(a) [CONFIDENTIAL MATERIAL OMITTED AND FILED SEPARATELY WITH THE SEC PURSUANT TO A REQUEST FOR CONFIDENTIAL TREATMENT] is
only applicable to the Firm Aircraft. [CONFIDENTIAL MATERIAL OMITTED AND FILED SEPARATELY WITH THE SEC PURSUANT TO A REQUEST FOR CONFIDENTIAL TREATMENT]

(b) [CONFIDENTIAL MATERIAL OMITTED AND FILED SEPARATELY WITH THE SEC PURSUANT TO A REQUEST FOR CONFIDENTIAL TREATMENT] is
applicable to (i) the Firm Aircraft and (ii) the exercised Purchase Right Aircraft. [CONFIDENTIAL MATERIAL OMITTED AND FILED SEPARATELY WITH THE SEC PURSUANT TO A REQUEST FOR CONFIDENTIAL TREATMENT]



|1. | Customers Written Notice.
|-- | --------------------------

Should
Customer elect to [CONFIDENTIAL MATERIAL OMITTED AND FILED SEPARATELY WITH THE SEC PURSUANT TO A REQUEST FOR CONFIDENTIAL TREATMENT] then, Customer shall provide written notice of its [CONFIDENTIAL MATERIAL OMITTED AND FILED
SEPARATELY WITH THE SEC PURSUANT TO A REQUEST FOR CONFIDENTIAL TREATMENT]

(a) no later than the first day of the
month that is [CONFIDENTIAL MATERIAL OMITTED AND FILED SEPARATELY WITH THE SEC



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PURSUANT TO A REQUEST FOR CONFIDENTIAL TREATMENT]prior to the scheduled month of delivery of the Aircraft [CONFIDENTIAL MATERIAL OMITTED AND FILED SEPARATELY WITH THE SEC PURSUANT TO A
REQUEST FOR CONFIDENTIAL TREATMENT]has been previously certified and delivered to Customer, or;

(b) no later than the
first day of the month that is [CONFIDENTIAL MATERIAL OMITTED AND FILED SEPARATELY WITH THE SEC PURSUANT TO A REQUEST FOR CONFIDENTIAL TREATMENT]prior to the scheduled month of delivery of the Aircraft [CONFIDENTIAL MATERIAL OMITTED AND
FILED SEPARATELY WITH THE SEC PURSUANT TO A REQUEST FOR CONFIDENTIAL TREATMENT] has not been previously certified and delivered to Customer.



|2. | Boeings Production Capability.
|-- | -------------------------------

2.1 The Customers [CONFIDENTIAL MATERIAL OMITTED AND FILED SEPARATELY WITH THE SEC PURSUANT TO A REQUEST FOR CONFIDENTIAL
TREATMENT]

2.2 If Boeing is [CONFIDENTIAL MATERIAL OMITTED AND FILED SEPARATELY WITH THE SEC PURSUANT TO A REQUEST FOR
CONFIDENTIAL TREATMENT]





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|3. | Price and Advance Payments.
|-- | ---------------------------

[CONFIDENTIAL MATERIAL OMITTED AND FILED SEPARATELY WITH THE SEC PURSUANT TO A REQUEST FOR CONFIDENTIAL TREATMENT]



|4. | Applicability of Certain Terms and Conditions.
|-- | ----------------------------------------------

[CONFIDENTIAL MATERIAL OMITTED AND FILED SEPARATELY WITH THE SEC PURSUANT TO A REQUEST FOR CONFIDENTIAL TREATMENT]



|5. | Assignment.
|-- | -----------

The rights and obligations
described in this Letter Agreement are provided to Customer in consideration of Customer becoming the operator of the Aircraft and can only be assigned, in whole or in part, pursuant to Article 9 of the AGTA as amended by Letter Agreement No.
6-1162-IRS-0184.



|6. | Definitive Agreement.
|-- | ---------------------

Customers
[CONFIDENTIAL MATERIAL OMITTED AND FILED SEPARATELY WITH THE SEC PURSUANT TO A REQUEST FOR CONFIDENTIAL TREATMENT] right and Boeings obligation in this Letter Agreement are further conditioned upon Customers and
Boeings executing (i) a supplemental agreement to the Purchase Agreement for [CONFIDENTIAL MATERIAL OMITTED AND FILED SEPARATELY WITH THE SEC PURSUANT TO A REQUEST FOR CONFIDENTIAL TREATMENT] days of Customers
[CONFIDENTIAL MATERIAL OMITTED AND FILED SEPARATELY WITH THE SEC PURSUANT TO A REQUEST FOR CONFIDENTIAL TREATMENT] notice to Boeing or of Customers acceptance of an [CONFIDENTIAL MATERIAL OMITTED AND FILED SEPARATELY WITH THE
SEC PURSUANT TO A REQUEST FOR CONFIDENTIAL TREATMENT] in accordance with paragraph 1 above. A supplemental agreement to the Purchase Agreement is not intended to change or modify the terms and conditions of the Purchase Agreement and will
incorporate the following update to the Purchase Agreement



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|7. | 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. 6-1162-IRS-0182.

Very
truly yours,



|                   |  |                 
|------------------ |  | ----------------
|THE BOEING COMPANY
|                   | 
|By                 |  | /s/ Nobuko Wiles
|                   | 
|Its                |  | Attorney-In-Fact

ACCEPTED AND AGREED TO this

Date:
February 19, 2010



|                       |  |                                                     
|---------------------- |  | ----------------------------------------------------
|UNITED AIR LINES, INC.
|                       | 
|By                     |  | /s/ Kathryn A. Mikells                              
|                       | 
|Its                    |  | Executive Vice President and Chief Financial Officer