Amendment No. 4 to the Amended and Restated Airbus A320 Family Aircraft Purchase Agreement

Exhibit 10.1

Confidential Treatment Requested

Amendment No. 4

to the

Amended and Restated Airbus A320 Family Aircraft Purchase Agreement

dated as of October 2, 2007

between

AIRBUS S.A.S.

and

US AIRWAYS, INC.

This Amendment No. 4 to the Amended and Restated Airbus A320 Family Aircraft Purchase Agreement between Airbus S.A.S. and US Airways, Inc. (the “ Amendment ”) is entered into as of August 11, 2009, by and between Airbus S.A.S., a société par actions simplifiée, organized and existing under the laws of the Republic of France, having its registered office located at 1, rond-point Maurice Bellonte, 31700 Blagnac, France (the “ Seller ”), and US Airways, Inc., a corporation organized and existing under the laws of the State of Delaware, United States of America, having its principal corporate offices located at 111 West Rio Salado Parkway, Tempe, Arizona 85281, U.S.A.(the “ Buyer ”);

WITNESSETH:

WHEREAS, the Buyer and the Seller have entered into an Amended and Restated Airbus A320 Family Purchase Agreement, dated as of October 2, 2007, which agreements, as previously amended by and supplemented with all Exhibits Appendices Letter Agreements and amendments, including Amendment No. 1 dated as of January 11, 2008 Amendment No. 2 dated as of October 20, 2008 and Amendment No. 3 dated as of January 16, 2009 (the “ Agreement ”) relates to the sale by the Seller and the purchase by the Buyer of certain Airbus single-aisle aircraft;

WHEREAS the Buyer and the Seller agree and acknowledge the cancellation of the fifteen (15) A318 Aircraft which were cancelled as of February 1, 2009; and

WHEREAS, the Buyer wishes to exercise its conversion rights with respect to one (1) New A319 Aircraft scheduled for delivery *****.

NOW, THEREFORE, IT IS AGREED AS FOLLOWS:

1. DEFINITIONS

Capitalized terms used herein and not otherwise defined in this Amendment will have the meanings assigned to them in the Agreement. The terms “herein,” “hereof,” and “hereunder” and words of similar import refer to this Amendment.

Confidential Treatment Requested

2 . CANCELLATION

The Buyer and the Seller hereby confirm that the fifteen (15) A318 Aircraft are cancelled pursuant to the terms of Letter Agreement No. 3 to the Agreement.

3. CONVERSION

Pursuant to the terms of Letter Agreement No. 3 to the Agreement, the Buyer hereby irrevocably exercises its right to convert one (1) New A319 Aircraft to one (1) Converted New A320 Aircraft as follows:

4. DELIVERY SCHEDULE

The delivery schedule table set forth in Clause 9.1.1 of the Agreement is deleted in its entirety and replaced with the delivery schedule table below between the QUOTE and the UNQUOTE:

QUOTE

Confidential Treatment Requested