<PAGE>
                                                                    Exhibit 10.9

            *** CERTAIN CONFIDENTIAL INFORMATION HAS BEEN OMITTED AND
                FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
                    COMMISSION PURSUANT TO RULE 24b-2 OF THE
                   SECURITIES EXCHANGE ACT OF 1934, AS AMENDED

                                AMENDMENT NO. 10

                                       TO

                        THE A319/A320 PURCHASE AGREEMENT
                         DATED AS OF SEPTEMBER 12, 1997

                              BETWEEN AVSA S.A.R.L.

                                       AND

                           AMERICA WEST AIRLINES, INC.

This Amendment No. 10 (hereinafter referred to as the "Amendment") entered into
as of September 27, 2005 by and between AVSA S.A.R.L., a societe a
responsabilite limitee organized and existing under the laws of the Republic of
France, having its registered office located at 2, Rond Point Maurice Bellonte,
31700 Blagnac, France (hereinafter referred to as the "USeller") and AMERICA
WEST AIRLINES, INC., a corporation organized and existing under the laws of the
State of Delaware, United States of America, having its principal corporate
office located at Phoenix Sky Harbor International Airport, 4000 East Sky Harbor
Boulevard, Phoenix, Arizona 85034, U.S.A. (hereinafter referred to as the
"Buyer").

WITNESSETH:

WHEREAS, the Buyer and the Seller have entered into an A319/A320 Purchase
Agreement, dated as of September 12, 1997 (which agreement, as previously
amended by and supplemented with all Exhibits, Appendices, Letter Agreements and
amendments, including Amendment No. 1 executed on April 27, 1998, Amendment No.
2 executed on December 9, 1998 together with Letter Agreement No. 1 to Amendment
No. 2 executed on May 24, 1999, Amendment No. 3 together with all Letter
Agreements thereto executed on October 14, 1999 and together with Letter
Agreement to Amendment No. 3 executed on May 10, 2001, Amendment No. 4 executed
on July 1, 2000 together with Letter Agreement to Amendment No. 4 executed on
July 28, 2000, Amendment No. 5 executed on October 12, 2000 together with Letter
Agreement to Amendment No. 5 executed on October 26, 2000, Amendment No. 6
executed on October 28, 2002, Amendment No. 7 together with all Letter
Agreements thereto executed on July 30, 2004, Amendment 8 executed on October 1,
2004, and Amendment 9 executed on September 27, 2005, the "Agreement"), which
Agreement relates to, inter alia, the sale by the Seller and the purchase by the
Buyer of certain firmly ordered Airbus A318-100, A319-100 and A320-200 model
aircraft.


AWE - A319/A320 - Amendment No. 10
                                   AM 10 - 1
<PAGE>
WHEREAS, in consideration of the Buyer's execution of the Memorandum of
Understanding referenced by AVSA No. 5343 dated May 18, 2005 (the "MOU"), the
Buyer and the Seller agree to restructure certain terms of the Agreement.

WHEREAS, 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.

NOW, THEREFORE IT IS AGREED AS FOLLOWS:

1.    [...***...].

2.    RESCHEDULED AIRCRAFT INITIAL PAYMENT

      Upon satisfaction of all the conditions precedent listed in Paragraph 7.1
      herein, the Buyer will pay to the Seller an initial payment in the amount
      of [...***...] for each Rescheduled Aircraft (the "Rescheduled Aircraft
      Initial Payment") for a total of [...***...] for the eleven (11)
      Rescheduled Aircraft (as defined in Amendment 9 to the Agreement).

3.    PREDELIVERY PAYMENTS

3.1   Prior to the date of this Amendment, the Seller has received from
      the Buyer cash Predelivery Payments in the amount of [...***...]
      pursuant to Paragraphs 1 and 2 of Letter Agreement No. 4 to
      Amendment 7 (Amended and Restated Letter Agreement No. 4 to the
      Agreement) ("LA 4").  The Seller will, upon satisfaction of all the
      conditions precedent listed in Paragraph 7.1 herein, apply such cash
      Predelivery Payments as follows:

      (i)   [...***...]; and

      (ii)  to the Rescheduled Aircraft Initial Payment.

3.2   In respect of the Rescheduled Aircraft, the A318 Aircraft and the
      [...***...], the provisions set forth in LA 4 will be deemed
      cancelled and of no further effect.

3.3   The Buyer will make Predelivery Payments on the Rescheduled
      Aircraft, the A318 Aircraft and the [...***...] to the Seller as
      follows:

            (i)   on the [...***...] Working Day of the [...***...] month
                  prior to each Scheduled Date of Delivery of each
                  Rescheduled Aircraft, the A318 Aircraft and the
                  [...***...] each in the amount of [...***...] (less the
                  Rescheduled Aircraft Initial Payment (only for the
                  Rescheduled Aircraft),

***CONFIDENTIAL TREATMENT REQUESTED


AWE - A319/A320 - Amendment No. 10
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            (ii)  on the [...***...] Working day of the [...***...] month prior
                  to each Scheduled Date of Delivery of each Rescheduled
                  Aircraft, the A318 Aircraft and the [...***...] each in the
                  amount of [...***...], and

            (iii) on the [...***...] Working day of the [...***...] month prior
                  to each Scheduled Date of Delivery of each Rescheduled
                  Aircraft, the A318 Aircraft, the [...***...] (the "PDP Due
                  Date) each in the amount of [...***...].

3.3.1 All Predelivery Payments shall be paid in immediately available
      funds. With respect to amounts due pursuant to paragraph 3.3 (iii)
      above, [...***...].

3.3.2 [...***...].

3.4   In respect of the New Purchase Right Aircraft, the provisions set forth in
      LA 4 will be deemed cancelled and of no further effect.

3.5   The Buyer will make Predelivery Payments on each New Purchase Right
      Aircraft converted into a firm order to the Seller as follows:

            (i)   upon written confirmation of acceptance by Buyer of the
                  New Purchase Right Aircraft delivery position, the New
                  Purchase Right Aircraft Predelivery Payment in the
                  amount of [...***...] as set forth in Paragraph 2 to
                  Letter Agreement No. 2 of Amendment 7 to the Agreement
                  (as amended by Paragraph 6 hereof); and

            (ii)  in accordance with Paragraphs 3.3(i), 3.3(ii), 3.3(iii), 3.3.1
                  and 3.3.2 it being understood that if the Buyer's written
                  confirmation of acceptance of the New Purchase Right Aircraft
                  delivery position occurs after the month specified for
                  payment, then such payment will be due upon Buyer's written
                  confirmation of acceptance of the New Purchase Right Aircraft
                  delivery position.

4-    PRICE REVISION

      The Final Contract Price for each Rescheduled Aircraft shall be derived as
      provided in the Agreement, [...***...].

5-    [...***...]

6-    NEW PURCHASE RIGHT AIRCRAFT

      Paragraph 2 of Letter Agreement No. 2 to Amendment No. 7 to the
      Agreement is deleted in its entirety and replaced by the following
      quoted language:

***CONFIDENTIAL TREATMENT REQUESTED


AWE - A319/A320 - Amendment No. 10
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      QUOTE

      2.    New Purchase Right Aircraft

      2.1   The Seller hereby grants to Buyer the right to purchase up to
            [...***...] New Purchase Right Aircraft, which the Buyer will
            have the right to purchase as either an A319, A320 and/or A321
            Aircraft for delivery dates in [...***...].

      2.2   The New Purchase Right Aircraft will remain without reserved
            delivery quarters by the Seller (i.e. remain subject to the
            Seller's industrial and commercial constraints and subject to
            prior sale and other disposition) until the Buyer requests a
            delivery date by written notice to the Seller, such notice
            also specifying the type of New Purchase Right Aircraft the
            Buyer is considering to firmly purchase.  The Seller will then
            provide in writing within ten (10) Working Days, subject to
            its industrial and commercial constraints at the time, a
            delivery month and year, which will remain subject to prior
            sale and other disposition until written confirmation of
            acceptance from the Buyer and concurrent payment of a New
            Purchase Right Aircraft Predelivery Payment in an amount of
            [...***...] (the "New Purchase Right Aircraft Predelivery
            Payment") (upon which the New Purchase Right Aircraft will be
            an Amendment 7 Aircraft under the Agreement).

      2.3   In connection with the unexercised Option Aircraft cancelled
            pursuant to Paragraph 1, above, the Seller acknowledges to
            have already received as of date hereof, from the Buyer Option
            Fees in the amount of [...***...] and the Seller and the Buyer
            agree that such Option Fees will be credited to the Buyer in
            increments of [...***...] against the New Purchase Right
            Aircraft Predelivery Payment to be paid by the Buyer to the
            Seller upon the exercise of each of the New Purchase Right
            Aircraft.

      2.4   Purchase Incentives for New Purchase Right Aircraft are set
            forth in Letter Agreement No. 3 to the Amendment.

   UNQUOTE

7-    EFFECT OF THE AMENDMENT AND OTHER MATTERS

7.1   It will be a condition precedent to the effectiveness of this
      Amendment that the conditions precedent to (i) the validity of the
      A350 Purchase Agreement dated as of the date hereof have been
      satisfied, and (ii) the conditions precedent to the obligations of
      Airbus Financial Services (the "Lender") set forth in the
      $161,000,000 Loan Agreement dated as of September 27, 2005 among US
      Airways, Inc., America West Airlines, Inc., US Airways Group, Inc.,
      the Lender and Wells Fargo bank Northwest,

***CONFIDENTIAL TREATMENT REQUESTED


AWE - A319/A320 - Amendment No. 10
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      National Association, as Collateral Agent, have been either satisfied or
      been waived by the Lender.

7.2   Upon effectiveness, the provisions of this Amendment will constitute a
      valid amendment to the Agreement and the Agreement will be deemed to be
      amended to the extent herein provided. This Amendment supersedes any
      previous understandings, commitments, or representations whatsoever,
      whether oral or written, related to the subject matter of this Amendment,
      including Paragraph 5 of the MOU.

      Both parties agree that this Amendment will constitute an integral,
      nonseverable part of the Agreement, and that this Amendment will be
      governed by the provisions of the Agreement, except that if the Agreement
      and this Amendment have specific provisions that are inconsistent, the
      specific provisions contained in this Amendment will govern.

8.    GOVERNING LAW

      THIS AMENDMENT AND THE AGREEMENTS CONTEMPLATED HEREBY WILL BE GOVERNED BY
      AND CONSTRUED AND THE PERFORMANCE THEREOF WILL BE DETERMINED IN ACCORDANCE
      WITH THE PROVISIONS OF SUBPARAGRAPH 22.3 OF THE AGREEMENT.

      IT IS AGREED THAT THE UNITED NATIONS CONVENTION ON CONTRACTS FOR THE
      INTERNATIONAL SALE OF GOODS WILL NOT APPLY TO THIS AMENDMENT OR TO THE
      AGREEMENTS CONTEMPLATED HEREIN.

9.    CONFIDENTIALITY

      The Seller and the Buyer (including their employees, agents and advisors)
      agree to keep the terms and conditions of this Amendment strictly
      confidential, except as required by applicable law or pursuant to legal
      process. The Seller and the Buyer will consult prior to any public
      disclosure regarding this Amendment; provided, however that, following
      execution of this Amendment, Buyer may make such disclosure thereof as may
      be required by law or governmental orders, rules or regulations.

10-   COUNTERPARTS

      This Amendment may be signed in any number of separate counterparts. Each
      counterpart when signed and delivered (including counterparts delivered by
      facsimile transmission) will be an original, and the counterparts will
      together constitute one same instrument.


AWE - A319/A320 - Amendment No. 10
                                   AM 10 - 5
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      If the foregoing correctly sets forth our understanding, please execute
the original and one (1) copy hereof in the space provided below and return a
copy to the Seller.

                                          Very truly yours,

                                          AVSA S.A.R.L.

                                          By:
                                             ----------------------

                                          Its:
                                              ---------------------

Accepted and Agreed,

AMERICA WEST AIRLINES, INC.

By:
   ----------------------------

Its:
    ---------------------------



AWE - A319/A320 - Amendment No. 10
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