Document:

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                                                                   EXHIBIT 10.11

                                                               Execution Version
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                   SUBORDINATED SPARE PARTS MORTGAGE AND SECURITY AGREEMENT

                          Dated as of September 3, 2004

                                     between

                           AMERICA WEST AIRLINES, INC.

                                       and

                WELLS FARGO BANK NORTHWEST, NATIONAL ASSOCIATION,

                               as Security Trustee

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<PAGE>

                                TABLE OF CONTENTS

<TABLE>
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                                                                                           Page
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<S>                                                                                        <C>
ARTICLE 1. DEFINITIONS..................................................................     1
     Section 1.01. Certain Definitions..................................................     1
     Section 1.02. Certain Rules of Construction........................................     1

ARTICLE 2. SECURITY.....................................................................     2
     Section 2.01. Grant of Security Interest...........................................     2

ARTICLE 3. COVENANTS OF THE COMPANY.....................................................     4
     Section 3.01. Liens................................................................     4
     Section 3.02. Possession, Use, Designated Locations, Excluded
                   Locations, Permitted Sales, Maintenance and
                   Identification.......................................................
     Section 3.03. Intentionally Left Blank.............................................     5
     Section 3.04. Intentionally Left Blank.............................................    10
     Section 3.05. Insurance............................................................    10
     Section 3.06. Assurances and Filings...............................................    10
     Section 3.07. Merger, Consolidation................................................    11
     Section 3.08. Notice of Change of the Company's Location...........................    11
     Section 3.09. Inspection...........................................................    12
                                                                                            12
ARTICLE 4. REMEDIES OF THE SECURITY TRUSTEE UPON AN EVENT OF DEFAULT....................
     Section 4.01. Remedies with Respect to Collateral..................................    13
     Section 4.02. Remedies Cumulative..................................................    13
     Section 4.03. Discontinuance of Proceedings........................................    15
     Section 4.04. Allocation of Payments...............................................    15
                                                                                            16
ARTICLE 5. INTENTIONALLY LEFT BLANK.....................................................    17

ARTICLE 6. SECURITY FUNDS
     Section 6.01. Investment of Security Funds.........................................    17

ARTICLE 7. MISCELLANEOUS................................................................    17
     Section 7.01. Termination of Mortgage..............................................    17
     Section 7.02. Alterations to Mortgage..............................................    18
     Section 7.03. No Legal Title to Collateral.........................................    18
     Section 7.04. Sale of the Engines by Security Trustee Is
                   Binding..............................................................    18
     Section 7.05. Benefit of Mortgage..................................................    18
     Section 7.06. Section 1110 of the Bankruptcy Code..................................    18
     Section 7.07. Notices..............................................................    19
     Section 7.08. Severability.........................................................    19
     Section 7.09. Separate Counterparts................................................    20
     Section 7.10. Successors and Assigns...............................................    20
</TABLE>

                                      (i)
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<TABLE>
<S>                                                                                        <C>
     Section 7.11. Headings.............................................................    20
     Section 7.12. Governing Law........................................................    20

APPENDIX A            Definitions

APPENDIX B            Insurance

EXHIBIT A             Supplemental Mortgage

SCHEDULE I            Designated Locations
</TABLE>

                                      (ii)
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            SUBORDINATED SPARE PARTS MORTGAGE AND SECURITY AGREEMENT

            This SUBORDINATED SPARE PARTS MORTGAGE AND SECURITY AGREEMENT, dated
as of September 3, 2004 (the "Mortgage") between AMERICA WEST AIRLINES, INC., a
Delaware corporation (the "Company"), and WELLS FARGO BANK NORTHWEST, NATIONAL
ASSOCIATION, as Security Trustee (the "Security Trustee").

                              W I T N E S S E T H :

            WHEREAS, as a condition to the Lenders entering into the Loan
Agreement, the Company, which is a certificated air carrier under Section 44705
of title 49 of the U.S. Code, has entered into the Indemnity Agreement to
support certain payment obligations due and owing to the Beneficiaries under the
AWA Operative Documents; and

            WHEREAS, the Lenders have agreed, pursuant and subject to the terms
and conditions of the Loan Agreement, to make the Loan to the Company secured by
a Lien on the Collateral; and

            WHEREAS, the Company desires by this Mortgage, among other things,
to grant to the Security Trustee for the benefit of the Secured Parties a
perfected Lien on the Collateral in accordance with the terms hereof, as
security for the Obligations; and

            WHEREAS, all things necessary to make this Mortgage a legal, valid
and binding obligation of the Company and the Security Trustee, for the uses and
purposes herein set forth, in accordance with its terms, have been done and
performed and have occurred;

            NOW, THEREFORE, to secure the due and punctual payment of the
Obligations, it is hereby covenanted and agreed by and between the parties
hereto as follows.

                                   ARTICLE 1.

                                   DEFINITIONS

            Section 1.01. Certain Definitions. Unless otherwise defined herein
or the context requires otherwise, capitalized terms used herein shall have the
meanings set forth in Appendix A hereto.

            Section 1.02. Certain Rules of Construction. The defined terms and
the other provisions of this Mortgage shall be construed in accordance with the
rules of construction set forth under the heading "General Provisions" in
Appendix A hereto.

<PAGE>

                                   ARTICLE 2.

                                    SECURITY

Section 2.01 Grant of Security Interest. In order to secure (i) the prompt
payment when due of the Obligations and (ii) the performance and observance by
the Company of all agreements, covenants and provisions contained herein and in
the other Operative Documents to the extent same relate to the Obligations and
in consideration of the premises and of the covenants herein contained, and of
other good and valuable consideration, the receipt of which is hereby
acknowledged, the Company has granted, bargained, sold, assigned, transferred,
conveyed, mortgaged, pledged and confirmed and does hereby grant, bargain, sell,
assign, transfer, convey, mortgage, pledge and confirm unto the Security
Trustee, its successors in trust and assigns, for the security and benefit of
the Secured Parties, a security interest in, and mortgage lien on, all right,
title and interest of the Company in, to and under the following described
properties, rights, interests and privileges (which, collectively, including all
property hereafter specifically subjected to the lien of this Mortgage by any
instrument supplemental hereto, are referred to herein as the "Collateral") (it
being expressly understood and agreed that the security interest granted
hereunder in the Collateral shall be junior, and otherwise subject and
subordinate in all respects, to the security interest granted in the Collateral
under the Senior Mortgage):

            (a) all Spare Parts and Appliances (including all Rotables and Key
      Repairables), other than any Excluded Parts, currently owned or hereafter
      acquired by the Company including any replacements, substitutions or
      renewals therefor, and accessions thereto, including but not limited to
      Spare Parts and Appliances owned or hereafter acquired by the Company and
      located at (a) the Designated Locations described on Schedule I attached
      hereto or (b) any other place in the United States of America or in Mexico
      (such Spare Parts and Appliances, the "Pledged Spare Parts");

            (b) the rights of the Company under any existing or hereinafter
      acquired warranty or indemnity, express or implied, regarding title,
      materials, workmanship, design or patent infringement or related matters
      in respect of the Pledged Spare Parts to the extent such rights can be
      assigned or pledged by the Company (the "Warranties");

            (c) all insurance proceeds and requisition proceeds with respect to
      any Pledged Spare Part;

            (d) all Software owned or hereafter acquired by the Company,
      including any replacement, substitution or renewal thereof, as well as all
      rights of the Company under any license or use agreement in respect of any
      Software not owned by the Company and all rights of the Company under any
      existing or hereinafter acquired service or support contracts or
      agreements in respect of the Software (such licenses and support
      agreements collectively, the "Software Support Agreements");

            (e) all rents, revenues and other proceeds collected or required to
      be collected by the Security Trustee hereunder, including, without
      limitation, all proceeds with respect to the sale or other disposition by
      the Security Trustee of any Pledged Spare Part or other Collateral
      pursuant to the terms of this Mortgage;

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            (f) all repair, maintenance and inventory records, logs, tags,
      manuals and all other documents and materials similar thereto (including,
      without limitation, any such records (whether on paper or in an electronic
      format), logs, manuals, documents and materials that are computer
      print-outs) at any time maintained, created or used by the Company, and
      all records, logs, tags, documents and other materials required at any
      time to be maintained by the Company by the FAA or under the Federal
      Aviation Act, in each case with respect to any of the Pledged Spare Parts
      (the "Spare Parts Documents"); and

            (g) all proceeds of the foregoing;

PROVIDED, HOWEVER, that notwithstanding any of the foregoing provisions of this
Section 2.01, so long as no Event of Default shall have occurred and be
continuing, (i) the Company shall have the right, to the exclusion of the
Security Trustee, to quiet enjoyment of the Pledged Spare Parts and other
Collateral, and peaceably and quietly, without hindrance or molestation, to
possess, use, retain and control the Pledged Spare Parts, (ii) subject always to
compliance with Section 3.02(c)(2) hereof, the Company shall have the right to
dispose of Spare Parts Documents in the ordinary course of its business, and
(iii) the Company shall have the right, to the exclusion of the Security
Trustee, with respect to the Warranties and the Software Support Agreements, to
exercise in the Company's name all rights and powers as the beneficiary, owner
and/or licensee thereof and to retain any recovery or benefit resulting from the
enforcement of any warranty, indemnity or other contract right under the
Warranties and the Software Support Agreements;

            TO HAVE AND TO HOLD the Collateral unto the Security Trustee, its
successors and assigns, forever, upon the terms herein set forth, for the
benefit, security and protection of the Security Trustee, and for the uses and
purposes and subject to the terms and provisions set forth in this Mortgage.

            It is expressly agreed that anything herein contained to the
contrary notwithstanding, the Company shall remain liable under the Warranties
and the Software Support Agreements to perform all of the obligations assumed by
it thereunder, all in accordance with and pursuant to the terms and provisions
thereof, and the Security Trustee shall have no obligation or liability under
the Warranties or Software Support Agreements by reason of or arising out of the
assignment hereunder, nor shall the Security Trustee be required or obligated in
any manner to perform or fulfill any obligations of the Company under any of the
Warranties or Software Support Agreements, or, except as herein expressly
provided, to make any payment, or to make any inquiry as to the nature or
sufficiency of any payment received by it, or present or file any claim, or take
any action to collect or enforce the payment of any amounts which may have been
assigned to it or to which it may be entitled at any time or times.

            The Company does hereby irrevocably constitute and appoint the
Security Trustee the true and lawful attorney of the Company (which appointment
is coupled with an interest) with full power (in the name of the Company or
otherwise) to ask, require, demand, receive, compound and give acquittance for
any and all moneys and claims for moneys (in each case including insurance and
requisition proceeds) and all other property which now or hereafter constitutes
part of the Collateral, to endorse any checks or other instruments or orders in
connection therewith and to file any claims or to take any action or to
institute any proceeding which the Security Trustee may deem to be necessary or
advisable to collect such property which

                                       3
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constitutes Collateral; provided that the Security Trustee shall not exercise
any such rights except upon the occurrence and during the continuance of an
Event of Default; provided, further, that the exercise of such rights shall at
all times be subject to the rights of the Senior Trustee under the Senior
Mortgage and to the provisions of Section 4.01(c) of this Mortgage. Without
limiting the provisions of the foregoing, during the continuance of any Event of
Default, but subject to the terms hereof and any mandatory requirements of
applicable Law, the Security Trustee shall have the right under such power of
attorney in its discretion to file any claim or to take any other action or
proceedings, either in its own name or in the name of the Company or otherwise,
that the Security Trustee may reasonably deem necessary or appropriate to
protect and preserve the right, title and interest of the Security Trustee in
and to the security intended to be afforded hereby. The Company hereby agrees
that, if the Lien of the Senior Mortgage has been discharged, promptly on
receipt thereof, except as otherwise contemplated by the Operative Documents, it
will transfer to the Security Trustee any and all moneys from time to time
received by the Company constituting part of the Collateral, for distribution by
the Security Trustee pursuant to this Mortgage.

            The Company does hereby warrant and represent that it has not sold
or assigned, and hereby covenants that it will not sell or assign, so long as
this Mortgage shall remain in effect and the Lien hereof shall not have been
released pursuant to the provisions hereof, any of its estate, right, title or
interest hereby assigned, to any Person other than the Security Trustee, except
as provided in the Senior Mortgage or as expressly permitted herein or in any
other Operative Document.

            The Company agrees that at any time and from time to time, upon the
written request of the Security Trustee, the Company will promptly and duly
execute and deliver or cause to be duly executed and delivered any and all such
further instruments and documents as the Security Trustee may reasonably deem
necessary to perfect and protect the priority of the security interests and
assignments created hereby and to obtain the full benefits of the security
interest granted hereunder and of the rights and powers herein granted.

                                   ARTICLE 3.

                            COVENANTS OF THE COMPANY

            Section 3.01. Liens. The Company will not directly or indirectly
create, incur, assume or permit to exist any Lien on or with respect to the
Company's interest in the Collateral, except:

                  (a) the Lien of this Mortgage and the Senior Mortgage;

                  (b) the rights of others under agreements or arrangements to
      the extent permitted by Section 3.02 hereof;

                  (c) Liens for Taxes of the Company and its U.S. Federal tax
      law consolidated group either not yet due or payable or being contested in
      good faith by appropriate proceedings so long as such Liens and such
      proceedings do not involve any material risk of the sale, forfeiture or
      loss (including loss of use) of any Pledged Spare

                                       4
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      Part or other portion of the Collateral or any interest therein or any
      discernible risk of criminal liability or any material risk of civil
      penalty against any Secured Party or impair the Lien of this Mortgage;

                  (d) materialmen's, mechanics', workmen's, repairmen's,
      employees' or other like Liens arising in the ordinary course of business
      (including those arising under maintenance agreements entered into in the
      ordinary course of business) securing obligations that are not overdue for
      more than sixty (60) days or are being contested in good faith by
      appropriate proceedings so long as such Liens and such proceedings do not
      involve any material risk of civil penalty or any discernible risk of
      criminal liability against any Secured Party or any material risk of the
      sale, forfeiture or loss of any Pledged Spare Part or other portion of the
      Collateral or adversely affect the Lien of this Mortgage;

                  (e) Liens arising out of any judgment or award against the
      Company, so long as such judgment or award shall, within sixty (60) days
      after the entry thereof, have been discharged or vacated, or execution
      thereof stayed pending appeal or shall have been discharged, vacated or
      reversed within sixty (60) days after the expiration of such stay and so
      long as during any such 60-day period there is not, or any such judgment
      or award does not involve, any material risk of the sale, forfeiture or
      loss (including loss of use) of any Pledged Spare Part or other portion of
      the Collateral, or any interest therein or any discernible risk of
      criminal liability or any material risk of civil penalty against any
      Secured Party or impair the Lien of this Mortgage;

                  (f) salvage or similar rights of insurers under policies of
      insurance maintained by the Company pursuant to Section 3.05 hereof;

                  (g) any other Lien with respect to which the Company shall
      have provided a bond, cash collateral or other security adequate in the
      reasonable opinion of the Security Trustee;

                  (h) Liens attributable to the Security Trustee; and

                  (i) Liens approved in writing by the Security Trustee.

Liens described in clauses (a) through (i) above are referred to herein as
"Permitted Liens." The Company shall promptly, at its own expense, take such
action as may be necessary to duly discharge (by bonding or otherwise) any such
Lien on the Collateral other than a Permitted Lien arising at any time.

            Section 3.02. Possession, Use, Designated Locations, Excluded
Locations, Permitted Sales, Maintenance and Identification.

      (a) Possession. Without the prior written consent of the Security Trustee,
the Company will not sell, lease, transfer or relinquish possession of any
Pledged Spare Part to anyone except as permitted by the provisions of Sections
3.02(b) of this Mortgage and except that the Company shall, subject to Section
3.03, have the right, in the ordinary course of business, (i) to transfer
possession of any Pledged Spare Part to the manufacturer thereof or any

                                       5
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other organization for testing, overhaul, repairs, maintenance, alterations or
modifications or to any Person for the purpose of transport to any of the
foregoing or (ii) to subject any Pledged Spare Part to a pooling, exchange,
borrowing or maintenance servicing agreement arrangement and entered into in the
ordinary course of business (provided always that no such arrangement results in
any Pledged Spare Part being stored at a location other than one of the
Designated Locations, or being commingled with any Excluded Parts and/or any
other Spare Parts and/or Appliances that are not Pledged Spare Parts).

      (b) Use; Designated Locations; Excluded Locations, Permitted Sales,
Dispositions or Modifications.

      (1) Use. Subject to the terms of this Mortgage (including, without
limitation, Section 3.03 hereof), the Company shall have the right, at any time
and from time to time at its own cost and expense, without any release from or
consent by the Security Trustee, to:

            (i) incorporate in, install on, attach or make appurtenant to, or
      use in, any aircraft, Engine or Spare Part or Appliance (whether or not
      subject to any Lien and whether or not operated by the Company) any
      Pledged Spare Part, free from the Lien of this Mortgage; and

            (ii) dismantle any Pledged Spare Part that has become worn out or
      obsolete or unfit for use, and to scrap, sell or dispose of any such
      Pledged Spare Part or any salvage resulting from such dismantling, free
      from the Lien of this Mortgage.

      (2) Designated Locations. The Company shall keep the Pledged Spare Parts
at one or more of the Designated Locations and, except as otherwise permitted
under Sections 3.02(a), 3.02(b)(1) or 3.02(b)(3) of this Mortgage, shall not
suffer or permit any Pledged Spare Part to be stored at any other location. The
Company shall not suffer or permit any Pledged Spare Parts at any Designated
Location to be commingled with any Excluded Parts (it being acknowledged that,
so long as the Company complies with Section 3.02(d)(1) hereof, Excluded Parts
which are stored on a separate shelf from Pledged Spare Parts and in a separate
storage bin or other storage unit from any Pledged Spare Parts shall not be
considered as having been commingled with Pledged Spare Parts even though such
Excluded Parts are present at the same Designated Location as the Pledged Spare
Parts). The Company shall ensure that each Designated Location is adequate for
warehousing and storing the Pledged Spare Parts, and at all times that the
Current Market Value of Rotables included in the Pledged Spare Parts which are
stored at a Secure Location is no less that eighty percent (80%) of the Current
Market Value of all the Rotables included within the Collateral, such Current
Market Value being calculated in accordance with the Senior Mortgage (with the
provisions of Senior Mortgage relating to such calculation being incorporated
herein by this reference solely for the purpose of making such calculation). The
Company shall obtain from each landlord, mortgagee or other Person from time to
time holding title to or a security or leasehold interest in a Designated
Location a waiver in a form reasonably satisfactory to the Security Trustee of
any right or interest in the Pledged Spare Parts stored at such Designated
Location. The Company shall add as a Designated Location (in accordance with
this Section 3.02(b)(2)) any location in the United States where Pledged Spare
Parts may be stored by the Company from time to time. At any time that the
Company, acting pursuant to the Senior Mortgage, adds a location that is to
become a "Designated Location" under the Senior

                                       6
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Mortgage, the Company shall concurrently add such location as Designated
Location under this Mortgage. Upon adding a location that is to become a
Designated Location, the Company will furnish to the Security Trustee the
following:

            (i) a Supplemental Mortgage duly executed by the Company,
      identifying each location that is to become a Designated Location and
      specifically subjecting the Pledged Spare Parts at such location to the
      Lien of this Mortgage;

            (ii) an Opinion of Counsel, dated the date of execution of said
      Supplemental Mortgage, stating that said Supplemental Mortgage has been
      duly filed for recording in accordance with the provisions of the Federal
      Aviation Act, and either: (a) no other filing or recording is required in
      any other place within the United States in order to perfect the Lien of
      this Mortgage on the Pledged Spare Parts held at the Designated Locations
      specified in such Supplemental Mortgage under the laws of the United
      States, or (b) if any such other filing or recording shall be required
      that said filing or recording has been accomplished in such other manner
      and places, which shall be specified in such Opinion of Counsel, as are
      necessary to perfect the Lien of this Mortgage with respect to such
      Pledged Spare Parts; and

            (iii) an Officer's Certificate stating that in the opinion of the
      Officer executing the Officer's Certificate, all conditions precedent
      provided for in this Mortgage relating to the subjection of such property
      to the Lien of this Mortgage have been complied with.

      (3) Excluded Locations. With the prior written consent of the Security
Trustee, which consent shall not be unreasonably withheld, the Company shall be
entitled, from time to time, to establish one or more locations for the storage
of Spare Parts and Appliances which shall not be subject to the lien of this
Mortgage (herein, "Excluded Locations"), provided that the Company's business
purpose in establishing such Excluded Location is to support operations that are
beyond the scope of the Company's existing and currently planned operations as
of the Funding Date. Notwithstanding any other provision of this Section
3.02(c)(3), for so long as the Lien of the Senior Mortgage shall remain in
effect, any "Excluded Location" (under and as defined in the Senior Mortgage)
established pursuant to the terms of the Senior Mortgage shall be deemed an
Excluded Location hereunder without further act by the Security Trustee. Without
limiting the generality of the foregoing, the Security Trustee shall be entitled
to withhold its consent to the establishment of an Excluded Location if the GECC
considers any of the following circumstances to be applicable:

            (i) the expected fair market value of the Spare Parts and Appliances
      to be stored at the proposed location would be less than $5,000,000;

            (ii) unless the proposed location would be devoted exclusively to
      the storage of Spare Parts and Appliances that are not compatible with any
      of the aircraft and engines operated by the Company as of the Funding
      Date, the proposed location would be in any of the states of Arizona,
      Maryland or Nevada;

            (iii) all or any material portion of the proposed location would be
      stocked by the transfer of Spare Parts and Appliances from any of the
      Designated Locations;

                                       7
<PAGE>

            (iv) GECC has not been offered the opportunity to provide the
      Company with financing for the Spare Parts and Appliances to be stored at
      the proposed location on terms, in the case of new acquisition financing,
      substantially the same as the terms of the Loan Agreement, and in the case
      of financing assumed by the Company in connection with the acquisition of
      such Spare Parts and Appliances, substantially the same as the terms of
      such pre-existing financing and at the same net financing cost to the
      Company (taking into account any prepayment premiums and/or breakage costs
      thereunder); provided, however, that if any pre-existing financing does
      not permit any voluntary prepayment thereof by the Company, then the
      failure by the Company to offer the lenders the opportunity to provide
      financing to take out such pre-existing financing shall not be deemed
      grounds for the Security Trustee to withhold its consent under this
      Section 3.02(b)(3);

            (v) the Company's acquisition of the Spare Parts and Appliances to
      be stored at the proposed location is part of the Company's ordinary fleet
      replacement and/or growth and is associated with routes served by the
      Company as of the Funding Date; or

            (vi) the amount of Spare Parts and Appliances to be stored at the
      proposed location will be greater than the amount reasonably required by
      the Company to support the operations of the aircraft and engines that are
      being added to the Company's fleet contemporaneously with the Company's
      acquisition of such Spare Parts and Appliances.

If the Lien of the Senior Mortgage shall have been discharged, the Security
Trustee shall be entitled to condition its consent to the establishment of an
Excluded Location upon the amendment of this Mortgage to include a covenant
pursuant to which the Company would be obligated to comply with such additional
inspection, reporting and valuation requirements (including, but not limited to,
the obligation to afford access to the Excluded Location to the Security Trustee
and the Independent Appraiser for inspection and other purposes) as the Security
Trustee may deem appropriate in order to ensure that the establishment and
maintenance of such Excluded Location does not have a prejudicial effect on
quantity or value of the Rotables and Key Repairables included within the
Pledged Spare Parts or on the interests of the Security Trustee in the
Collateral. In the event that the Senior Trustee conditions its consent to the
establishment of an "Excluded Location" (under and as defined in the Senior
Mortgage) upon the amendment of the Senior Mortgage to include any covenant,
this Mortgage shall be amended to include a corresponding covenant hereunder.

      (4) Permitted Sales, Dispositions and Modifications. Unless an Event of
Default has occurred and is continuing and subject to the limitations contained
in Section 3.03 of the Senior Mortgage, the Company may, in the ordinary course
of its business, (i) sell, lease, transfer or dispose of any Pledged Spare Parts
which have become surplus to its normal operations free from the Lien of this
Mortgage, and (ii) sell, lease, transfer or dispose of, in a single transaction
or in a series of transactions within any period of thirty (30) days, Pledged
Spare Parts with an aggregate Current Market Value equal to the Permitted
Disposition Amount or less which are not surplus to the Company's normal
operations so long as the Company acquires replacements for such Spare Parts and
causes such replacements to be subject to the Lien of this Mortgage and to be
stored within the appropriately marked shelves or storage areas at the
Designated Locations as

                                       8
<PAGE>

Pledged Spare Parts within the thirty (30) day period following any such sale,
lease, transfer or disposition (or, in the case of a series of transactions,
within the thirty (30) day period following the first of such transactions). In
addition, the Company may modify or alter any Pledged Spare Parts as the Company
may deem appropriate in the proper conduct of its business, so long as the
Company remains in compliance at all times with the requirements of Section
3.02(c) below, after giving effect to any such modification or alteration.

      (c) Maintenance. The Company:

      (1) shall maintain, or cause to be maintained, at all times the Pledged
Spare Parts in accordance with (x) all applicable Laws issued by the FAA and (y)
all applicable Laws issued by any other Governmental Authority having
jurisdiction over the Company or any such Pledged Spare Parts, including making
any modifications, alterations, replacements and additions necessary therefor;

      (2) shall maintain, or cause to be maintained, all records, logs and other
materials required by the FAA or under the Federal Aviation Act to be maintained
in respect of the Pledged Spare Parts and shall not modify its record retention
procedures in respect of the Pledged Spare Parts unless such modification is
consistent with the Company's FAA approved maintenance program; provided
however, that such modification shall not materially diminish the value of the
Pledged Spare Parts, taken as a whole;

      (3) shall maintain, or cause to be maintained on a timely basis, the
Pledged Spare Parts in good working order (other than during periods of
maintenance, overhaul, inspection and testing) and condition and shall perform
all maintenance thereon necessary for that purpose, excluding (i) Pledged Spare
Parts that have become worn out or unfit for use, beyond economic repair or
become obsolete or scrap, and (ii) Pledged Spare Parts that are not required for
the Company's normal operations. Notwithstanding anything herein to the
contrary, all Pledged Spare Parts located at Designated Locations other than for
the purpose of being maintained, altered, modified or overhauled shall have a
current and valid serviceable tag and shall be in compliance with such tag, in
each case in compliance with applicable FAA regulations.

      (d) Identification of Security Trustee's Interest.

      (1) On or prior to the Closing Date, the Company shall install signs, in
size and form reasonably satisfactory to the Security Trustee, at each of the
Designated Locations and on each shelf, bin or other storage unit in which the
Pledged Spare Parts are stored and otherwise as may be directed by the Security
Trustee within each Designated Location, bearing the inscription: "MORTGAGED TO
WELLS FARGO BANK NORTHWEST, NATIONAL ASSOCIATION, AS SECURITY TRUSTEE" (such
sign to be replaced if there is a successor Security Trustee).

      (2) The Company shall consult with the Security Trustee prior to replacing
the system utilized in tracking the Pledged Spare Parts. Any replacement system
must be reasonably acceptable to the Security Trustee. . In addition, in the
event that any such replacement system includes the use of any Software that is
licensed by the Company from a third party vendor, rather than owned outright,
then the Company shall, before implementing any such new system and Software,
cause such vendor or licensor to recognize the rights in such Software granted
to

                                       9
<PAGE>

the Security Trustee under this Mortgage, including the right to access and use
such Software in connection with the exercise of remedies under Section 4.01.

            Section 3.03. [Intentionally Left Blank] .

            Section 3.04. [Intentionally Left Blank] .

            Section 3.05. Insurance.

      (a) Obligation to Insure. The Company shall comply with, or cause to be
complied with, each of the provisions of Appendix B, which provisions are hereby
incorporated by this reference as if set forth in full herein.

      (b) Insurance for Own Account. Nothing in Section 3.05 shall limit or
prohibit (a) the Company from maintaining the policies of insurance required
under Appendix B with higher limits than those specified in Appendix B, or (b)
the Security Trustee or any other Secured Party from obtaining insurance for its
own account (and any proceeds payable under such separate insurance shall be
payable as provided in the policy relating thereto); provided, however, that no
insurance may be obtained or maintained that would limit or otherwise adversely
affect the coverage of any insurance required to be obtained or maintained by
the Company pursuant to this Section 3.05 and Appendix B.

      (c) Indemnification by Government in Lieu of Insurance. Security Trustee
agrees to accept, in lieu of insurance against any risk with respect to any
aircraft or Engine described in Appendix B, indemnification from, or insurance
provided by, the U.S. Government, or upon the written consent of Security
Trustee, other Government Entity, against such risk in an amount that, when
added to the amount of insurance (including permitted self-insurance), if any,
against such risk that the Company (or any Lessee) may continue to maintain, in
accordance with this Section 3.05, shall be at least equal to the amount of
insurance against such risk otherwise required by this Section 3.05.

      (d) Application of Insurance Proceeds. If the Lien of the Senior Mortgage
shall not have been discharged, all insurance proceeds in respect of the Pledged
Spare Parts shall be held and applied as provided in the Senior Mortgage. After
the Senior Mortgage shall have been discharged, all insurance proceeds in
respect of the Pledged Spare Parts, except as expressly provided in Section
3.05(e) below, shall be paid over to, and retained by, the Company.

      (e) Application of Payments During Existence of Event of Default. After
the Lien of the Senior Mortgage shall have been discharged, any amount referred
to in this Section 3.05 which is payable to or retainable by the Company shall
not be paid to or retained by the Company, if at the time of such payment or
retention a Special Default or an Event of Default shall have occurred and be
continuing, but shall be held by or paid over to the Security Trustee as
security for the Obligations and invested pursuant to Section 6.01. Upon the
earlier of (a) such time as there shall not be continuing any such Special
Default or Event of Default or (b) the termination of this Mortgage in
accordance with Section 7.01, such amount, and any interest realized thereon
pursuant to Section 6.01 hereof, shall be paid over to the Company to the extent
not previously applied in accordance with the preceding sentence.

                                       10
<PAGE>

            Section 3.06. Assurances and Filings.

      (a) The Company shall duly execute, acknowledge and deliver, or shall
cause to be executed, acknowledged and delivered, all such further agreements,
instruments, certificates or documents, and shall do and cause to be done such
further acts and things, in any case, as Security Trustee shall reasonably
request for accomplishing the purposes of this Mortgage including, without
limitation, ensuring that each of the Security Trustee, the Independent
Appraiser and GECC (so long as it is a Lender), subject, in each case, to such
Person executing any non-disclosure agreement as may be required by the Software
provider, remains at all times a third party beneficiary of any Software Support
Agreements.

      (b) The Company shall promptly take such action with respect to the
recording, filing, re-recording and refiling of this Mortgage and any amendments
or supplements thereto, as shall be necessary to continue the perfection and
priority of the Lien created by this Mortgage with respect to the Pledged Spare
Parts held at Designated Locations.

      (c) The Company, at its sole cost and expense, will cause this Mortgage
and any amendments or supplements hereto, as well as all UCC financing
statements and all continuation statements (and any amendments necessitated by
any consolidation or merger of the Company, any conveyance, transfer or lease of
all or substantially all of the assets of the Company, or any change of the
Company's location) in respect thereof, to be prepared and, subject only to the
execution and delivery thereof by Security Trustee, duly and timely filed and
recorded, or filed for recordation, to the extent permitted under the Federal
Aviation Act (with respect to this Mortgage and any amendments or supplements
hereto) or the UCC or similar law of any other applicable jurisdiction (with
respect to such financing statements and continuations and/or amendments
thereof). In addition, the Company will pay any and all recording, stamp and
other similar taxes payable in the United States, in connection with the
execution, delivery, recording, filing, re-recording and refiling of this
Mortgage or any such financing statements or other instruments.

            Section 3.07. Merger, Consolidation. The Company shall not
consolidate with or merge into any other Person or convey, transfer or lease all
or substantially all of its assets as an entirety to any Person unless:

            (i) the Person formed by such consolidation or into which the
Company is merged or the Person which acquires by conveyance, transfer or lease
substantially all of the assets of the Company as an entirety shall be a
Certificated Air Carrier;

            (ii) the Person formed by such consolidation or into which the
Company is merged or the Person which acquires by conveyance, transfer or lease
substantially all of the assets of the Company as an entirety shall execute and
deliver to the Security Trustee a duly authorized, valid, binding and
enforceable agreement in form and substance reasonably satisfactory to the
Security Trustee containing an assumption by such Person of the due and punctual
performance and observance of each covenant and condition of the Operative
Documents to be performed or observed by the Company;

                                       11
<PAGE>

            (iii) immediately after giving effect to such transaction, no Event
of Default shall have occurred and be continuing;

            (iv) all filings shall have been made as shall be necessary to
preserve the perfection of the Lien of the Mortgage on the Pledged Spare Parts
on a second priority and perfected basis; and

            (v) promptly after the consummation of such transaction, the Company
shall deliver to the Security Trustee a certificate of the Secretary or an
Assistant Secretary of Company certifying as to Company's compliance with the
conditions of this Section 3.07 and an opinion of Company's Legal Department as
to Company's compliance with Sections 3.07(i), 3.07(ii) and 3.07(iv).

            Upon any such consolidation or merger, or any conveyance, transfer
or lease of substantially all of the assets of the Company as an entirety in
accordance with this Section , the successor corporation or Person formed by
such consolidation or into which the Company is merged or to which such
conveyance, transfer or lease is made shall succeed to, and be substituted for,
and may exercise every right and power of, the Company under this Mortgage and
the other Operative Documents with the same effect as if such successor
corporation or Person had been named as the Company herein. No such conveyance,
transfer or lease of substantially all of the assets of the Company as an
entirety shall have the effect of releasing the Company or any successor
corporation or Person which shall theretofore have become such in the manner
prescribed in this Section from its liability in respect of any Operative
Document to which it is a party.

            Section 3.08. Notice of Change of the Company's Location. The
Company will notify the Security Trustee of any change in the location of the
Company (within the meaning of Section 9-307 of the Uniform Commercial Code)
promptly after making such change and in any event within a reasonable period of
time prior to the date by which it is necessary under applicable Law to make any
filing in order to prevent the lapse of perfection (absent refiling) of
financing statements filed under or with respect to this Mortgage.

            Section 3.09. Inspection.

      (a) After the Lien of the Senior Mortgage shall have been discharged, at
reasonable times but, so long as no Default shall have occurred and be
continuing, not more often than once every 12 months, the Security Trustee and
its authorized representatives (the "Inspecting Parties") may inspect the
Pledged Spare Parts located at Designated Locations (including without
limitation, the Spare Parts Documents and any computer files maintained by the
Company with respect to the Pledged Spare Parts) and the Company shall cooperate
with the Inspecting Parties in connection with any such inspection (including,
without limitation, providing Inspecting Parties reasonable access to buildings
or facilities at Designated Locations where such Pledged Spare Parts are located
and permitting any such Inspecting Party to make copies of Spare Parts Documents
and computer files (excluding the Software) not reasonably deemed confidential
by the Company) at its own cost and expense.

                                       12
<PAGE>

      (b) Any inspection of the Pledged Spare Parts hereunder shall be limited
to a visual inspection, shall be in compliance with the Company's work and
safety rules at the Designated Locations (and any applicable governmental rules
and regulations), and shall not include the disassembling, or opening of any
components, of any Pledged Spare Part, and no such inspection shall interfere
with the Company's or any Lessee's maintenance or use of any Pledged Spare Part.

      (c) With respect to such rights of inspection, the Security Trustee shall
not:

            (i) have any duty or liability to make, or any duty or liability
      arising out of, any such visit, inspection or survey or failure to make
      any such visit, inspection or survey; or

            (ii) so long as no Event of Default has occurred and is continuing,
      exercise its inspection rights hereunder other than on reasonable notice
      and, whether or not an Event of Default shall have occurred and be
      continuing, so as not to unreasonably interfere with the Company's spare
      parts management operations or maintenance and operation of its aircraft
      and Engines.

      (d) Each person inspecting the Pledged Spare Parts hereunder shall bear
its own expenses in connection with any such inspection, unless an Event of
Default shall have occurred and be continuing, in which case the Company shall
bear all such expenses.

            Section 3.10. [Intentionally Left Blank]

                                   ARTICLE 4.

      REMEDIES OF THE SECURITY TRUSTEE UPON A SUBORDINATED EVENT OF DEFAULT

            Section 4.01. Remedies with Respect to Collateral.

      (a) Remedies Available. Upon the occurrence of any Subordinated Event of
Default and at any time thereafter so long as the same shall be continuing, the
Security Trustee may do one or more of the following:

            (i) cause the Company, upon the written demand of the Security
      Trustee, at the Company's expense, to deliver promptly, and the Company
      shall deliver promptly, all or any of the Pledged Spare Parts constituting
      the Collateral at the Designated Locations, together in each case with the
      Spare Parts Documents for such Pledged Spare Parts as the Security Trustee
      may so demand, to the Security Trustee or its order, or the Security
      Trustee, at its option, may enter upon the premises where all or any of
      such Pledged Spare Parts and/or Spare Parts Documents are located and take
      immediate possession (to the exclusion of the Company and all Persons
      claiming under or through the Company) of and remove the same by summary
      proceedings;

                                       13
<PAGE>

            (ii) sell all or any part of the Collateral at public or private
      sale, whether or not the Security Trustee shall at the time have
      possession thereof, as the Security Trustee may determine, or lease or
      otherwise dispose of all or any part of the Collateral as the Security
      Trustee, in its sole discretion, may determine, all free and clear of any
      rights or claims of whatsoever kind of the Company; provided, however,
      that the Company shall be entitled at any time prior to any such
      disposition to redeem the Collateral by paying in full all of the
      Obligations; or

            (iii) exercise any or all of the rights and powers and pursue any
      and all remedies of a secured party under applicable Law.

            Upon every such taking of possession of Collateral under this
Section 4.01, the Security Trustee may, from time to time, make all such
expenditures for maintenance, insurance, repairs, replacements, alterations,
additions and improvements to and of the Collateral, as it may deem proper. In
each such case, the Security Trustee shall have the right to maintain, store,
lease, control or manage the Collateral and to exercise all rights and powers of
the Company relating to the Collateral in connection therewith, as the Security
Trustee shall deem best, including the right to enter into any and all such
agreements with respect to the maintenance, insurance, storage, leasing,
control, management or disposition of the Collateral or any part thereof as the
Security Trustee may determine; and the Security Trustee shall be entitled to
collect and receive directly all tolls, rents, revenues, issues, income,
products and profits of the Collateral and every part thereof, without
prejudice, however, to the right of the Security Trustee under any provision of
this Mortgage to collect and receive all cash held by, or required to be
deposited with, the Security Trustee hereunder. Such tolls, rents, revenues,
issues, income, products and profits shall be applied to pay the expenses of
storage, leasing, control, management or disposition of the Collateral, and of
all maintenance, repairs, replacements, alterations, additions and improvements,
and to make all payments which the Security Trustee may be required or may elect
to make, if any, for taxes, assessments, insurance or other proper charges upon
the Collateral or any part thereof (including the employment of engineers and
accountants to examine, inspect and make reports upon the properties and books
and records of the Company), and all other payments which the Security Trustee
may be required or authorized to make under any provision of this Mortgage, as
well as compensation for the services of the Security Trustee, and of all
Persons engaged and employed by the Security Trustee. If the income and proceeds
of the Collateral shall not be sufficient to pay in full the Obligations, the
Company shall be liable for any deficiency.

            In addition, the Company shall be liable for all reasonable legal
fees and other costs and expenses incurred by reason of the occurrence of any
Event of Default or the exercise of the Security Trustee's remedies with respect
thereto, including, without limitation, all costs and expenses incurred in
connection with the retaking or return of any Pledged Spare Parts in accordance
with the terms hereof or under applicable Law, which amounts shall, until paid,
be secured by the Lien of this Mortgage.

            If a Subordinated Event of Default shall have occurred and be
continuing, at the request of the Security Trustee the Company shall promptly
execute and deliver to the Security Trustee such instruments of title and other
documents as the Security Trustee may deem necessary or advisable to enable the
Security Trustee or an agent or representative designated by

                                       14
<PAGE>

the Security Trustee, at such time or times and place or places as the Security
Trustee may specify, to obtain possession of all or any part of the Collateral
to which the Security Trustee shall at the time be entitled hereunder. If the
Company shall for any reason fail to execute and deliver such instruments and
documents after such request by the Security Trustee, the Security Trustee may
obtain a judgment conferring on the Security Trustee the right to immediate
possession of the Collateral and requiring the Company to execute and deliver
such instruments and documents to the Security Trustee, to the entry of which
judgment the Company hereby specifically consents to the fullest extent it may
lawfully do so. If an Event of Default shall have occurred and be continuing,
the Company shall provide the Security Trustee or any of its agents or
representatives, with full and complete access to the system (including the
Software) utilized by the Company or its designees solely to track the Pledged
Spare Parts.

            (b) Notice of Sale. The Security Trustee shall give the Company at
least fifteen (15) days' prior written notice of the date fixed for any public
sale of any Pledged Spare Parts or of the date on or after which any private
sale will be held, which notice the Company hereby agrees is reasonable notice,
and any such public sale shall be conducted in general so as to afford the
Company a reasonable opportunity to bid.

            (c) Senior Mortgage. Anything herein to the contrary
notwithstanding, unless the Lien of the Senior Mortgage shall have been
discharged, the Security Trustee shall not be entitled to, and shall not proceed
to foreclose the Lien of this Mortgage against any of the Collateral or
otherwise exercise any right or remedy pursuant to this Mortgage attributable to
the occurrence of a Subordinated Event of Default, unless and until the Senior
Trustee shall have exercised or concurrently be exercising one or more
dispossessory remedies under the Senior Mortgage with respect to the Pledged
Spare Parts, and in the exercise of any of the Security Trustee's rights and
remedies under this Mortgage, the Security Trustee may not exercise any such
right or remedy in a manner inconsistent with, or otherwise in a manner which
would impair or impede or otherwise adversely affect, the exercise of the rights
and remedies of the Senior Trustee under the Senior Mortgage; it being expressly
understood and agreed that the Lien of this Mortgage on the Collateral shall at
all times be junior and otherwise subject and subordinate in all respects, to
the Lien of the Senior Mortgage.

            Section 4.02. Remedies Cumulative. Each and every right, power and
remedy herein specifically given to the Security Trustee or otherwise in this
Mortgage shall be cumulative and shall be in addition to every other right,
power and remedy herein specifically given or now or hereafter existing at law,
in equity or by statute, and each and every right, power and remedy whether
specifically herein given or otherwise existing may be exercised from time to
time and as often and in such order as may be deemed expedient by the Security
Trustee, and the exercise or the beginning of the exercise of any power or
remedy shall not be construed to be a waiver of the right to exercise at the
time or thereafter any other right, power or remedy. No delay or omission by the
Security Trustee in the exercise of any right, remedy or power or in the
pursuance of any remedy shall impair any such right, power or remedy or be
construed to be a waiver of any default on the part of the Company or to be an
acquiescence therein.

            Section 4.03. Discontinuance of Proceedings. If the Security Trustee
shall have proceeded to enforce any right, power or remedy under this Mortgage
by foreclosure, entry or otherwise, and such proceedings shall have been
discontinued or abandoned for any reason, then

                                       15
<PAGE>

and in every such case the Company and the Security Trustee shall be restored to
their former positions and rights hereunder with respect to the property,
subject to the Lien of this Mortgage, and all rights, remedies and powers of the
Security Trustee shall continue, as if no such proceedings had been undertaken
(but otherwise without prejudice).

            Section 4.04. Allocation of Payments. Notwithstanding any other
provisions of the Indemnity Agreement to the contrary, after the occurrence and
during the continuance of a Subordinated Event of Default, all amounts collected
or received by the Security Trustee or any other Secured Party on account of the
Obligations shall be paid over or delivered as follows:

            FIRST, to the payment of all reasonable out-of-pocket costs and
      expenses (including without limitation reasonable attorneys' fees and
      expenses actually incurred) of the Security Trustee in connection with
      enforcing the rights of the Security Trustee under the Operative
      Documents;

            SECOND, to payment of any fees owed to the Security Trustee;

            THIRD, to the payment of all reasonable out-of-pocket costs and
      expenses (including without limitation, reasonable attorneys' fees and
      expenses actually incurred by joint counsel for the Beneficiaries) of each
      of the Beneficiaries in connection with enforcing its rights under the
      Operative Documents or otherwise with respect to the Obligations owing to
      such Beneficiary;

            FOURTH, to all other Obligations (other than as covered by Clause
      "FIFTH", "SIXTH" and "SEVENTH" below) which shall have become due and
      payable under the Operative Documents or otherwise and not repaid pursuant
      to clauses "FIRST" through "THIRD" above; and

            FIFTH, to the payment of all accrued interest on the Obligations;

            SIXTH, to the payment of the Guaranteed Amount then due and unpaid;

            SEVENTH, to be held by the Security Trustee as cash collateral
      pursuant to this Mortgage until the Lien of this Mortgage shall have been
      terminated;

            EIGHTH, to the payment of the surplus, if any, to whoever may be
      lawfully entitled to receive such surplus.

In carrying out the foregoing, (i) amounts received shall be applied in the
numerical order provided until exhausted prior to application to the next
succeeding category and (ii) if amounts available are insufficient to pay all
amounts due within any category, such available amounts shall be paid pro rata
to the parties entitled thereto based upon the amount due under such category to
each such party or, in the case of Clauses FOURTH, FIFTH and SIXTH, applied
among the parties entitled thereto in accordance with written instructions of
GECC.

            Section 4.05. Turnover of Payments to Senior Trustee. Until the Lien
of the Senior Mortgage shall have been discharged, the Security Trustee and each
Beneficiary shall hold in trust for the benefit of the "Secured Parties" (as
defined in the Senior Mortgage) and shall

                                       16
<PAGE>

promptly pay to the Senior Trustee for the benefit of such "Secured Parties" any
proceeds of the Collateral for distribution in accordance with the Senior
Mortgage.

                                   ARTICLE 5.

                            INTENTIONALLY LEFT BLANK

                                   ARTICLE 6.

                                 SECURITY FUNDS

            Section 6.01. Investment of Security Funds. Any monies paid to or
received by the Security Trustee as cash collateral or which are required to be
paid to the Company or applied for the benefit of the Company (including,
without limitation, amounts payable to the Company under Section 3.05(e)
hereof), but which the Security Trustee is entitled to hold under the terms
hereof pending the occurrence of some event or the performance of some act
(including, without limitation, the remedying of a Subordinated Event of
Default), shall, until paid to the Company or applied as provided herein, be
invested by the Security Trustee at the written authorization and direction of
the Company (or, if a Subordinated Event of Default shall have occurred and be
continuing, the Security Trustee) from time to time at the sole expense and risk
of the Company in Permitted Investments. All Permitted Investments held by the
Security Trustee pursuant to this Section 6.01 shall either be (a) registered in
the name of, payable to the order of, or specially endorsed to, the Security
Trustee or (b) held in an Eligible Account. At the time of such payment or
application, there shall be remitted to the Company any gain (including interest
received) realized as the result of any such investment (net of any fees,
commissions, other expenses or losses, if any, incurred in connection with such
investment) unless a Subordinated Event of Default shall have occurred and be
continuing. The Security Trustee shall not be liable for any loss relating to a
Permitted Investment made pursuant to this Section 6.01. The Company will
promptly pay to the Security Trustee, on demand, the amount of any loss (net of
any gains, including interest received) realized as the result of any such
investment (together with any fees, commissions and other expenses, if any,
incurred in connection with such investment).

            Section 6.02 [Intentionally Left Blank]

            Section 6.03 [Intentionally Left Blank]

                                   ARTICLE 7.

                                  MISCELLANEOUS

            Section 7.01. Termination of Mortgage. Upon (or at any time after)
the later of (i) payment in full of the unpaid principal of, and accrued
interest on, the Loans and all other Senior Obligations then due and payable
(and regardless of whether any Default or Event of Default shall have occurred
and be continuing) and (ii) the Designated Date (or, if on the later of

                                       17
<PAGE>

the foregoing a case is pending under the Bankruptcy Code in which the Company
is the debtor, then (x) if such case is under Chapter 11 of the Bankruptcy Code,
upon effectiveness of the Company's plan of reorganization in such Chapter 11
case if no Obligations are then due and unpaid or (y) if clause (x) is not
applicable, at such time as all Obligations that are allowed claims (within the
meaning of Section 502 of the Bankruptcy Code) in such case and secured under
the Mortgage have been paid in full), the Security Trustee shall, upon the
written request of the Company execute and deliver to, or as directed in writing
by, the Company an appropriate instrument (in due form for recording) releasing
the Pledged Spare Parts and the balance of the Collateral from the Lien of this
Mortgage and, in such event, this Mortgage shall terminate and this Mortgage
shall be of no further force or effect. Upon any release of any Pledged Spare
Parts from the Lien of this Mortgage in accordance with the terms of this
Mortgage, the Spare Parts Documents and other Collateral referred to in
subsections (b), (c), (d) and (e) of Section 2.01 relating to such Pledged Spare
Part shall also be released.

            Section 7.02. Alterations to Mortgage. No amendment to or waiver of
any provision of this Mortgage, nor consent to any departure by the Company
herefrom, shall in any event be effective unless the same shall be in writing
and signed by the Security Trustee and the Company, and any such waiver or
consent shall be effective only in the specific instance and for the specific
purpose for which given. This Mortgage shall not be varied except in accordance
with the Loan Agreement.

            Section 7.03. No Legal Title to Collateral. No Secured Party shall
have legal title to any part of the Collateral. No transfer, by operation of Law
or otherwise, of any right, title or interest in respect of any of the
Obligations or any right, title and interest of any Secured Party in and to the
Collateral or this Mortgage shall operate to terminate this Mortgage or entitle
any successor or transferee to an accounting or to the transfer to it of legal
title to any part of the Collateral.

            Section 7.04. Sale of the Collateral by Security Trustee Is Binding.
Any sale or other conveyance of the Collateral, or any part thereof or any
interest therein by the Senior Trustee or the Security Trustee made pursuant to
and in accordance with the terms of the Senior Mortgage or this Mortgage,
respectively, shall bind the Secured Parties, and shall be effective to transfer
or convey all right, title and interest of the Security Trustee, the Secured
Parties and the Company, in and to such Collateral, or such part thereof or
interest therein. No purchaser or other grantee shall be required to inquire as
to the authorization, necessity, expediency or regularity of such sale or
conveyance or as to the application of any sale or other proceeds with respect
thereto by the Security Trustee.

            Section 7.05. Benefit of Mortgage. Nothing in this Mortgage, whether
express or implied, shall be construed to give to any Person other than the
Company, the Secured Parties and the Security Trustee any legal or equitable
right, remedy or claim under or in respect of this Mortgage.

            Section 7.06. Section 1110 of the Bankruptcy Code. It is the
intention of the parties hereto that the security interest created hereby in the
Pledged Spare Parts entitles the Security Trustee on behalf of the Beneficiaries
to all of the benefits of Section 1110 of Chapter 11 of the Bankruptcy Code with
respect to at least the Minimum 1110 Percentage (determined on

                                       18
<PAGE>

the basis of Appraisal Value) of the Rotables included within the Pledged Spare
Parts in the event the Company becomes a debtor under such Chapter.

            Section 7.07. Notices. Unless otherwise expressly specified or
permitted by the terms hereof, any notice or other communication herein required
or permitted to be given shall be in writing and may be personally served or
sent by telefacsimile, United States mail, courier service or overnight delivery
and shall be effective when received addressed:

            (i)   if to the Company, at its office at

                  America West Airlines, Inc.
                  4000 Sky Harbor Blvd.
                  Phoenix, AZ 85034

                  Attention:    Vice President and Treasurer
                  Telephone:    (480) 693-5886
                  Telecopy:     (480) 693-3685
                  email:        tom.weir@americawest.com

            (ii)  if to the Security Trustee, at its office at

                  MAC: U1228-120
                  299 South Main Street,
                  12th Floor
                  Salt Lake City, Utah 84111

                  Attention:    Corporate Trust Services

                  Telephone:    (801) 246-5630

                  Telecopy:     (801) 246-5053

                  Email: michael.hoggan@wellsfargo.com

            (iii) if to any Beneficiary, at its address for notices to it
                  provided under the Indemnity Agreement,

            or, as to any party, at such other address as such party shall from
            time to time designate by written notice to the other parties in
            accordance with this Section 7.07.

            Section 7.08. Severability. Should any one or more provisions of
this Mortgage be determined to be illegal or unenforceable by a court of any
jurisdiction, such provision shall be ineffective to the extent of such
illegality or unenforceability without invalidating the remaining provisions
hereof or affecting the validity or enforceability of such provisions in any
other jurisdiction. The Company and the Security Trustee agree, as to such
jurisdiction and to the extent permitted by such jurisdiction's Laws, to replace
any provision of this Mortgage which is so determined to be illegal or
unenforceable by a valid provision which has as nearly as possible the same
effect; provided that such replacement provision shall not expand the Company's
or the Security Trustee's obligations hereunder.

                                       19
<PAGE>

            Section 7.09. Separate Counterparts. This Mortgage may be executed
in any number of counterparts (and each of the parties hereto shall not be
required to execute the same counterpart). Each counterpart of this Mortgage
executed by a party hereto shall be an original counterpart of this Mortgage,
and all of such counterparts together shall constitute one instrument.

            Section 7.10. Successors and Assigns. All covenants and agreements
contained herein shall be binding upon, and inure to the benefit of, the Company
and its successors and permitted assigns, and the Security Trustee and its
successors and permitted assigns, all as herein provided.

            Section 7.11. Headings. The headings of the various Articles and
Sections herein are for convenience of reference only and shall not define or
limit any of the terms or provisions hereof.

            Section 7.12. Governing Law; Submission to Jurisdiction; Venue..

  (a) This Mortgage and the rights and obligations of the parties hereunder
      shall be construed in accordance with and be governed by the laws of the
      State of New York. Any legal action or proceeding with respect to this
      Mortgage may be brought in the courts of the State of New York or the
      United States for the Southern District of New York located in the Borough
      of Manhattan, and, by execution and delivery of this Mortgage, each party
      hereto hereby irrevocably accepts for itself and in respect of its
      property, generally and unconditionally, the jurisdiction of the aforesaid
      courts. Each party hereto hereby further irrevocably waives any claim that
      any such courts lack jurisdiction over such party, and agrees not to plead
      or claim, in any legal action or proceeding with respect to this Mortgage
      brought in any of the aforesaid courts, that any such court lacks
      jurisdiction over such party. Each party hereto further irrevocably
      consents to the service of process out of any of the aforementioned courts
      in any such action or proceeding by the mailing of copies thereof by
      registered or certified mail, postage prepaid, to it at its address
      specified pursuant to Section 7.07, such service to become effective 30
      days after such mailing. Nothing herein shall affect the right of any
      party hereto to serve process in any other manner permitted by law or to
      commence legal proceedings or otherwise proceed against any other party
      hereto in any other jurisdiction.

  (b) Each party hereto hereby irrevocably waives any objection which it may
      now or hereafter have to the laying of venue of any of the aforesaid
      actions or proceedings arising out of or in connection with this Mortgage
      brought in the courts referred to in clause (a) above and hereby further
      irrevocably waives and agrees not to plead or claim in any such court that
      any such action or proceeding brought in any such court has been brought
      in an inconvenient forum.

      Section 7.13 WAIVER OF TRIAL BY JURY. TO THE EXTENT PERMITTED BY
APPLICABLE LAW, EACH PARTY HERETO IRREVOCABLY WAIVES ALL RIGHT OF TRIAL BY JURY
IN ANY ACTION, PROCEEDING OR COUNTERCLAIM ARISING OUT

                                       20
<PAGE>

OF, OR IN CONNECTION WITH THIS MORTGAGE OR ANY MATTER ARISING THEREUNDER.

THIS MORTGAGE IS BEING DELIVERED IN THE STATE OF NEW YORK AND SHALL IN ALL
RESPECTS, INCLUDING ALL MATTERS OF CONSTRUCTION, VALIDITY AND PERFORMANCE, BE
GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH, THE LAW OF THE STATE OF NEW YORK.

            Section 7.14 Certification. The Company hereby represents that it is
a certificated air carrier under Section 44705 of title 49 of the U.S. Code.

                       [Remainder of this page is blank.]

                                       21
<PAGE>

            IN WITNESS WHEREOF, the parties hereto have caused this Mortgage to
be duly executed by their respective officers, as the case may be, thereunto
duly authorized, as of the day and year first above written.

                                       AMERICA WEST AIRLINES, INC.

                                       By: /s/ Thomas T. Weir
                                          _________________________________
                                          Name: Thomas T. Weir
                                          Title: Vice President and Treasurer

                                       WELLS FARGO BANK NORTHWEST
                                       NATIONAL ASSOCIATION, as Security Trustee

                                       By: /s/ Michael D. Hoggan
                                          _________________________________
                                          Name: Michael D. Hoggan
                                          Title: Vice President

<PAGE>

                                                                      APPENDIX A

                           DEFINITIONS RELATING TO THE
                  SUBORDINATED MORTGAGE AND SECURITY AGREEMENT

                               General Provisions

(a)   Unless otherwise expressly provided, a reference to:

      (i)   each of "the Company," "Security Trustee" or any other person
            includes, without prejudice to the provisions of any Operative
            Document, any successor in interest to it and any permitted
            transferee or permitted assignee of it;

      (ii)  words importing the plural include the singular and words importing
            the singular include the plural;

      (iii) any agreement, instrument or document, or any annex, schedule or
            exhibit thereto, or any other part thereof, includes, without
            prejudice to the provisions of any Operative Document, that
            agreement, instrument or document, or annex, schedule or exhibit, or
            part, respectively, as amended, modified or supplemented from time
            to time in accordance with its terms and in accordance with the
            Operative Documents, and any agreement, instrument or document
            entered into in substitution or replacement therefor;

      (iv)  any provision of any Law includes any such provision as amended,
            modified, supplemented, substituted, reissued or reenacted prior to
            the Closing Date, and thereafter from time to time;

      (v)   the words "Mortgage," "this Mortgage," "hereby," "herein," "hereto,"
            "hereof" and "hereunder" and words of similar import when used in
            the Mortgage refer to the Mortgage as a whole and not to any
            particular provision of the Mortgage;

      (vi)  the words "including," "including, without limitation," "including,
            but not limited to," and terms or phrases of similar import when
            used in the Mortgage, with respect to any matter or thing, mean
            including, without limitation, such matter or thing; and

      (vii) a "Section," an "Exhibit," an "Appendix," an "Annex" or a "Schedule"
            referred to in the Mortgage, or in any annex thereto, is a reference
            to a section of, or an exhibit, an appendix, an annex or a schedule
            to, the Mortgage or such annex, respectively.

(b)   Each exhibit, appendix, annex and schedule to the Mortgage is incorporated
      in, and shall be deemed to be a part of, the Mortgage.

(c)   Headings used in the Mortgage are for convenience only and shall not in
      any way affect the construction of, or be taken into consideration in
      interpreting, the Mortgage.

                                       1
<PAGE>

                                                                      APPENDIX A

(d)   The occurrence and continuance of a Default, Special Default, Subordinated
      Event of Default or Event of Default shall not be deemed to prohibit the
      Company from taking any action or exercising any right that is conditioned
      on no Default, Special Default, Subordinated Event of Default or Event of
      Default having occurred and be continuing if such Default, Special
      Default, Subordinated Event of Default or Event of Default consists of the
      institution of reorganization proceedings with respect to the Company
      under Chapter 11 of the Bankruptcy Code and the trustee or
      debtor-in-possession in such proceedings shall have agreed to perform its
      obligations under the Mortgage with the approval of the applicable court
      and thereafter shall have continued to perform such obligations in
      accordance with Section 1110 of the Bankruptcy Code.

                                   Definitions

            "Affiliate" means, with respect to any person, any other person
directly or indirectly controlling, controlled by or under common control with
such person. For purposes of this definition, "control" means the power,
directly or indirectly, to direct or cause the direction of the management and
policies of such person, whether through the ownership of voting securities or
by contract or otherwise and "controlling," "controlled by" and "under common
control with" have correlative meanings.

            "Appliance" means an instrument, equipment, apparatus, a part, an
appurtenance, or an accessory used, capable of being used, or intended to be
used, in operating or controlling aircraft in flight, including a parachute,
communication equipment, and another mechanism installed in or attached to
aircraft during flight, and not a part of an aircraft, Engine, or Propeller.

            "Appraisal Value" has the meaning given such term in the Senior
Mortgage

            "AWA Operative Documents" has the meaning given such term in the
Indemnity Agreement.

            "Bankruptcy Code" means Title 11 of the United States Code, as the
same may be amended.

            "Beneficiaries" has the meaning given to that term in the Indemnity
Agreement.

            "Business Day" means any day except Saturday, Sunday and any day
which shall be in New York City or Phoenix, Arizona a day on which banking
institutions are authorized or required by Law to close.

            "Certificated Air Carrier" means a Person holding an air carrier
operating certificate issued by the Secretary of Transportation pursuant to
Chapter 447 of Title 49, United States Code, for aircraft capable of carrying
ten or more individuals or 6,000 pounds or more of cargo.

            "Citizen of the United States" has the meaning specified in Section
40102(a)(15) of Title 49 of the United States Code.

                                       2
<PAGE>

                                                                      APPENDIX A

            "Closing Date" means the Funding Date for the Loan made pursuant to
the Loan Agreement.

            "Collateral" has the meaning given such term in Section 2.01 of the
Mortgage.

            "Company" means America West Airlines, Inc., a Delaware corporation.

            "Current Market Value" has the meaning given to that term in the
Senior Mortgage.

            "Default" means any event which, with the giving of notice, lapse of
time or both would become an Event of Default.

            "Designated Date" has the meaning given such term in the Loan
Agreement.

            "Designated Locations" means the locations designated from time to
time by the Company at which the Pledged Spare Parts may be maintained by or on
behalf of the Company, which initially shall be the locations set forth on
Schedule I to the Mortgage and shall include the additional locations designated
by the Company pursuant to Section 3.02(b)(2) of the Mortgage.

            "Dollars" and "$" means the lawful currency of the United States of
America.

            "Eligible Account" means an account established by and with an
Eligible Institution at the request of the Security Trustee, which institution
agrees, for all purposes of the New York UCC including Article 8 thereof, that
(a) such account shall be a "securities account" (as defined in Section 8-501 of
the New York UCC), (b) such institution is a "securities intermediary" (as
defined in Section 8-102(a)(14) of the New York UCC), (c) all property (other
than cash) credited to such account shall be treated as a "financial asset" (as
defined in Section 8-102(9) of the New York UCC), (d) the Security Trustee shall
be the "entitlement holder" (as defined in Section 8-102(7) of the New York UCC)
in respect of such account, (e) it will comply with all entitlement orders
issued by the Security Trustee to the exclusion of the Company, (f) it will
waive or subordinate in favor of the Security Trustee all claims (including
without limitation, claims by way of security interest, lien or right of set-off
or right of recoupment), and (g) the "securities intermediary jurisdiction"
(under Section 8-110(e) of the New York UCC) shall be the State of New York.

            "Eligible Institution" means (a) the Security Trustee, acting solely
in its capacity as a "securities intermediary" (as defined in Section 8-102(14)
of the New York UCC), or (b) a depository institution organized under the Laws
of the United States of America or any of the states thereof or the District of
Columbia (or any U.S. branch of a foreign bank), which has a long-term unsecured
debt rating from Moody's and Standard & Poor's of at least A3 or its equivalent.

            "Engine" means an engine used, or intended to be used, to propel an
aircraft, including a part, appurtenance, and accessory of the Engine.

            "Environmental Laws" means all laws, rules, regulations, codes,
ordinances, orders, decrees, judgments, injunctions, notices or binding
agreements issued, promulgated or

                                       3
<PAGE>

                                                                      APPENDIX A

entered into by any Governmental Authority, relating in any way to the
environment, preservation or reclamation of natural resources, the management,
release or threatened release of any Hazardous Material or to health and safety
matters.

            "Event of Default" has the meaning given such term in the Loan
Agreement until the Lien of the Senior Mortgage shall have been discharged and
thereafter shall mean a Subordinated Event of Default.

            "Excluded Parts" means (i) Expendable Parts that are not stored on a
shelf or within an area marked with the signs and inscriptions required pursuant
to Section 3.02(d) at a Designated Location, (ii) Spare Parts and Appliances
that are stored at an Excluded Location established in accordance with Section
3.02(b)(3) of the Mortgage and (iii) Hazardous Materials.

            "Expendable Parts" means those Spare Parts and Appliances that, once
used, cannot be re-used, and if not serviceable, cannot be overhauled or
repaired.

            "Federal Aviation Act" means Part A of Subtitle VII of Title 49,
United States Code.

            "Federal Aviation Administration" and "FAA" mean the United States
Federal Aviation Administration, and any agency or instrumentality of the United
States government succeeding to its functions.

            "Funding Date" has the meaning given to such term in the Loan
Agreement.

            "GECC" means General Electric Capital Corporation, a Delaware
corporation.

            "Government Entity" means (a) any federal, state, provincial or
similar government, and any body, board, department, commission, court,
tribunal, authority, agency or other instrumentality of any such government or
otherwise exercising any executive, legislative, judicial, administrative or
regulatory functions of such government or (b) any other government entity
having jurisdiction over any matter contemplated by the Operative Documents or
relating to the observance or performance of the obligations of any of the
parties to the Operative Documents.

               "Hazardous Materials" means all explosive or radioactive
substances or wastes and all hazardous or toxic substances, wastes or other
pollutants, including petroleum or petroleum distillates, asbestos or asbestos
containing materials, polychlorinated biphenyls, radon gas, infectious or
medical wastes and all other substances or wastes of any nature regulated
pursuant to any Environmental Laws.

            "Indemnity Agreement" means the Payment and Indemnity Agreement
[Spare Parts], dated as of September 3, 2004, among the Company, the
Beneficiaries and Wells Fargo Bank Northwest, National Association, as security
trustee thereunder.

            "JAA" means the European Joint Aviation Authorities, and any agency
or instrumentality succeeding to its functions.

                                       4
<PAGE>

                                                                      APPENDIX A

            "Key Repairable" means those Spare Parts and Appliances that can be
economically restored or repaired to a serviceable condition, but have a life
that is considerably less than the life of the flight equipment to which they
are related.

            "Law" means (a) any constitution, treaty, statute, law, decree,
regulation, order, rule or directive of any Government Entity, and (b) any
judicial or administrative interpretation or application of, or decision under,
any of the foregoing.

            "Lender" has the meaning given to that term in the Loan Agreement.

            "Lien" means any mortgage, pledge, lien, charge, encumbrance, lease,
or security interest affecting the title to or interest in property.

            "Loan" has the meaning given to that term in the Loan Agreement.

            "Loan Agreement" means the Loan Agreement [Spare Parts], dated as of
September 3, 2004 among the Company, GECC, the Security Trustee and the Lenders
from time to time party thereto.

            "Maximum Self-Insurance Amount" has the meaning set forth in
Schedule II to the Indemnity Agreement.

            "Minimum Liability Amount" has the meaning set forth in Schedule II
to the Indemnity Agreement.

            "Minimum 1110 Percentage" has the meaning set forth in Schedule II
to the Indemnity Agreement.

            "Moody's" means Moody's Investors Service, Inc.

            "Mortgage" means the Subordinated Spare Parts Mortgage and Security
Agreement covering the Collateral dated as of September 3, 2004, between the
Company and the Security Trustee.

            "New York UCC" means the Uniform Commercial Code as in effect in the
State of New York.

            "Obligations" means the Guaranteed Amount (as defined in the
Indemnity Agreement) and all other obligations of every nature of the Company
from time to time owed to the Security Trustee, the Beneficiaries or any of them
under the Indemnity Agreement or any other Operative Document.

            "Officer's Certificate" means, as to any company, a certificate
signed by the Chairman, any Vice Chairman, the President, any Executive Vice
President, any Senior Vice President, any Vice President, any Assistant Vice
President, the Treasurer, any Assistant Treasurer, the Secretary, or any
Assistant Secretary of such company.

                                       5
<PAGE>

                                                                      APPENDIX A

            "Operative Documents" means the Indemnity Agreement, the Mortgage
and each Supplemental Mortgage.

            "Permitted Disposition Amount" has the meaning set forth in Schedule
II to the Indemnity Agreement.

            "Permitted Investments" means (i) securities issued or directly and
fully guaranteed by the United States of America or any agency or
instrumentality thereof (provided that the full faith and credit of the United
States of America is pledged in support thereof), the Federal Home Loan Mortgage
Corporation, the Student Loan Marketing Association and the Federal National
Mortgage Association, in all cases having a maturity of not more than 90 days
or, in the case of auction rate notes issued by any of the foregoing, having an
action reset interval of not more than 30 days; (ii) certificates of deposit,
bankers' acceptances, repurchase agreements or time deposits issued or accepted
or guaranteed by any bank, trust company or national banking association
incorporated under the Laws of the United States of America or one of the states
thereof having combined capital and surplus and retained earnings as of its last
report of condition of at least $500,000,000 and having a rating of AA or better
by Moody's or AA or better by Standard & Poor's and having a final maturity of
90 days or less from date of purchase thereof; and (iii) commercial paper of any
holding company of a bank, trust company or national banking association
described in (ii) and commercial paper of any corporation or finance company
incorporated or doing business under the Laws of the United States of America or
any state thereof having a rating assigned to such commercial paper of A1 by
Standard & Poor's or P1 by Moody's and having a final maturity of 90 days or
less from the date of purchase thereof; provided that the aggregate amount at
any one time invested in certificates of deposit issued by any one bank shall
not be in excess of 5% of such bank's capital and surplus.

            "Permitted Liens" has them meaning given such term in Section 3.01
of the Mortgage.

            "Person" has the meaning given to such term in the Loan Agreement.

            "Pledged Spare Parts" has the meaning set forth in clause (a) of the
first paragraph of Section 2.01 of the Mortgage.

            "Propeller" includes a part, appurtenance, and accessory of a
propeller.

            "Rotable" means those Spare Parts and Appliances that can be
repeatedly and economically restored to a serviceable condition over a period
approximating the life of the flight equipment to which they are related.

            "Secure Location" means an area in a Designated Location to which
access is controlled by lock and key, supported by an appropriate security
system, and which is accessible only to authorized employees of the Company.

            "Secured Parties" means the Beneficiaries and the Security Trustee.

            "Security Trustee" means Wells Fargo Bank Northwest, National
Association, in its capacity as security trustee under the Mortgage.

                                       6
<PAGE>

                                                                      APPENDIX A

            "Senior Mortgage" means the Spare Parts Mortgage and Security
Agreement, dated as of September 3, 2004, between the Company and Wells Fargo
Bank Northwest, National Association, as security trustee thereunder, which
secures, among other things, the Company's obligations under the Loan Agreement.

            "Senior Obligations" means the "Obligations" as defined in the
Senior Mortgage.

            "Senior Trustee" means the "Security Trustee" as defined in the
Senior Mortgage.

            "Software" means any and all computer programs and inventory
management systems, including, but not limited to all source code and user
interfaces associated therewith as well as all data files used as input thereto
and data files or other records generated thereby, used by the Company to track
and manage the location, use and maintenance status of Spare Parts and
Appliances.

            "Special Default" has the meaning given to that term in the Loan
Agreement until the Lien of the Senior Mortgage shall have been discharged and
thereafter shall mean any event pursuant to clauses (a), (b) or (f) of the
definition of "Subordinated Event of Default" or any event or condition that
with the lapse of time or giving of notice, or both, would constitute a
"Subordinated Event of Default" under clauses (a), (b) or (f) of such
definition.

            "Spare Part" means an accessory, appurtenance, or part of an
aircraft (except an Engine or Propeller), Engine (except a Propeller),
Propeller, or Appliance, that is to be installed at a later time in an aircraft,
Engine, Propeller or Appliance.

            "Spare Parts Documents" has the meaning set forth in clause (e) of
the first paragraph of Section 2.01 of the Mortgage.

            "Standard & Poor's" has the meaning given to such term in the Loan
Agreement.

            "Subordinated Event of Default" means each of the following events,
whether any such event shall be voluntary or involuntary or come about or be
effected by operation of law or pursuant to or in compliance with any judgment,
decree or order of any court or any order, rule or regulation of any
administrative or governmental body:

            (a) the failure of the Company to pay any Guaranteed Amount (as
defined in the Indemnity Agreement) after the expiration of any grace period or
the giving of any notice (or both) applicable to the payment that the Company
failed to make under an AWA Operative Document which resulted in such Guaranteed
Amount becoming due; or

            (b) The Company shall fail to pay any amount (other than any
Guaranteed Amount) payable hereunder or under any Operative Document when due
and such failure shall continue for a period of ten Business Days after receipt
by the Company of written notice that such payment is overdue given to the
Company by the Security Trustee; or

            (c) Any representation or warranty made by the Company in Section
3.1 of the Indemnity Agreement or pursuant to any other Operative Document, or
any amendment or

                                       7
<PAGE>

                                                                      APPENDIX A

modification of any Operative Document, or in any report, certificate or other
document prepared by the Company (other than any financial statements or
documents filed by the Company with the Securities and Exchange Commission) and
furnished pursuant to or in connection with any Operative Document or any
amendment or modification thereof or waiver thereunder shall prove to have been
incorrect in any material respect when made, such incorrect representation or
warranty is material at the time in question, and, if curable, the same shall
remain uncured for a period in excess of 30 days after the date of written
notice thereof from the Security Trustee; or

            (d) The Company shall fail to perform or observe any term, covenant
or agreement contained in this Mortgage or any other Operative Document (other
than those referred to in clauses (a) and (b) above) on its part to be performed
or observed and such failure shall remain unremedied for a period of 30 days
after written notice of such failure shall have been given to the Company by the
Security Trustee, unless such failure is capable of being corrected and the
Company shall be diligently proceeding to correct such failure, in which case
there shall be no Subordinated Event of Default unless and until such failure
shall continue unremedied for a period of 60 days after receipt of such notice;
or

            (e) The Company shall consent to the appointment of or the taking of
possession by a receiver, trustee or liquidator of itself or of substantially
all of its property, or the Company shall admit in writing its inability to pay
its debts generally as they come due, or does not pay its debts generally as
they become due or shall make a general assignment for the benefit of creditors,
or the Company shall file a voluntary petition in bankruptcy or a voluntary
petition or an answer seeking reorganization, liquidation or other relief in a
case under any bankruptcy laws or other insolvency laws (as in effect at such
time), or the Company shall seek relief by voluntary petition, answer or
consent, under the provisions of any other bankruptcy or other similar law
providing for the reorganization or winding-up of corporations (as in effect at
such time) or the Company's board of directors shall adopt a resolution
authorizing any of the foregoing; or

            (f) An order, judgment or decree shall be entered by any court of
competent jurisdiction appointing, without the consent of the Company, a
receiver, trustee or liquidator of the Company or of substantially all of its
property, or substantially all of the property of the Company shall be
sequestered, and any such order, judgment or decree of appointment or
sequestration shall remain in force undismissed, unstayed and unvacated for a
period of 90 days after the date of entry thereof; or a petition against the
Company in a case under any bankruptcy laws or other insolvency laws (as in
effect at such time) is filed and not withdrawn or dismissed within 90 days
thereafter, or if, under the provisions of any law providing for reorganization
or winding-up of corporations which may apply to the Company, any court of
competent jurisdiction assumes jurisdiction, custody or control of the Company
or of substantially all of its property and such jurisdiction, custody or
control remains in force unrelinquished, unstayed and unterminated for a period
of 90 days; or

            (g) The Company shall fail to carry and maintain, or cause to be
carried and maintained, insurance on and in respect of any Engine in accordance
with the provisions of Section 3.05 of this Mortgage; or

                                       8
<PAGE>

                                                                      APPENDIX A

            (h) The Company shall cease to be a Certificated Air Carrier; or

            (i) This Mortgage shall for any reason cease to be a valid
second-priority (or, if the Senior Mortgage shall have been terminated, first-
priority) perfected security interest (subject to Permitted Liens) in favor of
the Security Trustee in the Company's right, title and interest in and to the
Pledged Spare Parts under the laws of the United States of America.

            "Taxes" has the meaning given to that term in the Loan Agreement.

            "Supplemental Mortgage" means a Subordinated Supplemental Mortgage
and Security Agreement in substantially the form of Exhibit A to the Mortgage.

            "Threshold Amount" has the meaning set forth in Schedule II to the
Indemnity Agreement.

            "UCC" or "Uniform Commercial Code" means the Uniform Commercial Code
as in effect in any applicable jurisdiction.

            "U.S. Government" means the federal government of the United States,
or any instrumentality or agency thereof the obligations of which are guaranteed
by the full faith and credit of the federal government of the United States.

            "Warranties"" has the meaning given to that term in Section 2.01 of
the Mortgage.

                                       9
<PAGE>

                                   APPENDIX B

                                    INSURANCE

      Capitalized terms used but not defined herein shall have the respective
meanings set forth or incorporated by reference in Appendix A to the Mortgage.

A.    LIABILITY INSURANCE

            The Company will carry or cause to be carried at all times, at no
expense to any Secured Party, third party liability insurance with respect to
the Pledged Spare Parts, which is (i) of amount and scope as is usually carried
by airlines engaged in the same or similar business, similarly situated with
Company and owning or operating similar spare parts for aircraft and engines and
covering risks of the kind customarily insured against by the Company for
equipment similar to the Pledged Spare Parts and (ii) maintained in effect with
insurers of recognized responsibility (such insurers being referred to herein as
"Approved Insurers").

            The Company will carry or cause to be carried at all times, at no
expense to any Secured Party, with Approved Insurers third party liability
insurance covering the Designated Locations where any Pledged Spare Parts shall
be located. Pursuant to Section C below, the Secured Parties shall be named as
Additional Insureds under any such insurance policy.

B.    PROPERTY INSURANCE

            The Company will carry or cause to be carried at all times, at no
expense to Security Trustee or any Lender, with Approved Insurers insurance
covering physical damage to the Pledged Spare Parts, of the type covering the
same risks as are usually carried by airlines engaged in the same or similar
business as Company and covering risks of the kind customarily insured against
by Company and providing for the reimbursement of the actual expenditure
incurred in repairing or replacing any damaged or destroyed Pledged Spare Part
or, if not repaired or replaced, for the payment of the amount it would cost
(determined as of the date of loss) to repair or replace such Pledged Spare Part
with proper deduction for obsolescence and physical depreciation.

            The Company will carry or cause to be carried at all times, at no
expense to any Secured Party, with Approved Insurers property insurance covering
the Designated Locations where any Pledged Spare Parts shall be located.

            Any policies of insurance carried in accordance with this Section B
covering the Pledged Spare Parts and any policies taken out in substitution or
replacement for any such policies shall provide that (A) if the Lien of the
Senior Mortgage shall not have been discharged, all insurance proceeds in
respect of the Pledged Spare Parts shall be held and applied as provided in the
Senior Mortgage, and (B) after the Senior Mortgage shall have been discharged,
all insurance proceeds in respect of the Pledged Spare Parts shall be paid over
to, and retained by, the Company; provided that if a Special Default or Event of
Default shall have occurred and be

                                       B-1
<PAGE>

continuing and the insurers have been notified thereof by the Security Trustee
or any other Person, the amount of any proceeds of any loss with respect to the
Pledged Spare Parts shall be paid to the Security Trustee.

C.    GENERAL PROVISIONS

            Any policies of insurance carried in accordance with Sections A and
B, including any policies taken out in substitution or replacement for such
policies:

            (a) shall name each Secured Party as an additional insured
      (collectively, the "Additional Insureds"), as their respective interests
      may appear;

            (b) in the case of Section A, shall provide that, in respect of the
      interests of the Additional Insureds in such policies, the insurance shall
      not be invalidated or impaired by any act or omission (including
      misrepresentation and nondisclosure) by the Company or any other Person
      (including, without limitation, use of the Pledged Spare Parts for illegal
      purposes) and shall insure the Additional Insureds regardless of any
      breach or violation of any representation, warranty, declaration, term or
      condition contained in such policies by the Company;

            (c) shall provide that, if the insurers cancel such insurance for
      any reason whatsoever, including nonpayment of premium, or if any material
      change is made in the insurance which adversely affects the interest of
      any of the Additional Insureds, such cancellation or change shall not be
      effective as to the Additional Insureds for 30 days (10 days for
      nonpayment of premiums or cancellation by the Company) after receipt by
      the Additional Insureds of written notice by such insurers of such
      cancellation or change;

            (d) shall waive any right of recourse, subrogation, setoff,
      recoupment, counterclaim or other deduction against any Additional
      Insured;

            (e) shall be primary without right of contribution from any other
      insurance that may be available to any Additional Insured;

            (f) in the case of Section A, shall provide that all of the
      liability insurance provisions thereof, except the limits of liability,
      shall operate in all respects as if a separate policy had been issued
      covering each party insured thereunder; and

            (g) shall provide that none of the Additional Insureds shall be
      liable for any insurance premium.

D.    REPORTS ETC.

            On or prior to the Closing Date and on or prior to each renewal date
of the insurance policies required hereunder, the Company will furnish or cause
to be furnished to the Secured Parties insurance certificates describing in
reasonable detail the insurance maintained by the Company hereunder and a
report, signed by the Company's regularly retained independent insurance broker
(the "Insurance Broker"), stating the opinion of such Insurance Broker that all
premiums in connection with the insurance then due have been paid and that the
insurance terms

                                       B-2
<PAGE>

are in compliance with the requirements of this Annex I. Such information shall
remain confidential as provided in Section 6.11 of the Indemnity Agreement. The
Company will cause such Insurance Broker to agree to advise the Security Trustee
in writing of any default in the payment of premium as required by the terms
hereof and to advise the Security Trustee at least sixty (60) days (ten (10)
days in the case of nonpayment of premium) prior to the cancellation or material
adverse change of any insurance maintained pursuant to this Appendix B. In the
event that the Company shall fail to maintain or cause to be maintained
insurance as herein provided, the Security Trustee may, at its sole option,
provide such insurance and, in such event, the Company shall, upon demand,
reimburse the Security Trustee for the cost thereof.

E.    REINSURANCE

            The Company shall procure that in respect of insurances maintained
by the Company in accordance with the provisions in this Appendix B the insurers
shall maintain, if such insurances do not provide for direct coverage in the
markets hereafter referred to, reinsurance covering identical subject matter and
risk for an amount which shall not be less than 100% of the coverage amount
under Sections A and B hereof in Lloyd's of London or other internationally
recognized aviation reinsurance markets. Such reinsurance shall contain a
customary "cut-through" endorsement and shall provide that any payment by the
reinsurers shall be made notwithstanding any bankruptcy, insolvency or
liquidation of the original insurer and/or that the original insurer has made no
payment under the original policies.

F.    SELF-INSURANCE

            The Company may self-insure, by way of deductible, premium
adjustment provisions in insurance policies, or otherwise, on a basis consistent
with standard industry practice among major U.S. Airlines, the risks required to
be insured against pursuant to Sections A and B hereof but in no case shall the
self-insurance exceed the Maximum Self-Insurance Amount for any one ocurrence.

                                      B-3
<PAGE>

                                    EXHIBIT A

        FORM OF SUBORDINATED SUPPLEMENTAL MORTGAGE AND SECURITY AGREEMENT

                          (TO ADD DESIGNATED LOCATIONS)

                         SUPPLEMENTAL MORTGAGE NO. _____

            SUPPLEMENTAL MORTGAGE NO.______, dated as of ___________of AMERICA
WEST AIRLINES, INC., a Delaware corporation (together with its successors and
assigns, the "Company").

            WHEREAS, the Company, which is a certificated air carrier under
Section 44705 of title 49 of the U.S. Code, and Wells Fargo Bank Northwest,
National Association, as Security Trustee (the "Security Trustee"), have
heretofore executed and delivered a Subordinated Spare Parts Mortgage and
Security Agreement, dated as of September 3, 2004 (the "Mortgage"), and terms
defined in the Mortgage and used herein have such defined meanings unless
otherwise defined herein;

            WHEREAS, the Mortgage grants a Lien on, among other things, certain
Spare Parts and Appliances to secure (subject to the provisions of the Mortgage)
the payment of the Obligations under the Operative Documents; and

            WHEREAS, the Company has previously designated the locations at
which the Pledged Spare Parts may be stored by the Company in the Mortgage [and
in Supplemental Mortgage No. __];

            WHEREAS, the Mortgage [and the Supplemental Mortgages] has [have]
been duly recorded with the Federal Aviation Administration at Oklahoma City,
Oklahoma, pursuant to the Federal Aviation Act on the following date as a
document or conveyance bearing the following number:

<TABLE>
<CAPTION>
                                                DATE OF            DOCUMENT OR
                               DATE            RECORDING         CONVEYANCE NO.
<S>                            <C>             <C>               <C>
Mortgage
Supplemental Mortgage
No.[]
</TABLE>

            WHEREAS, the Company, as provided in the Mortgage, is hereby
executing and delivering to the Security Trustee this Supplemental Mortgage for
the purposes of adding locations at which the Pledged Spare Parts may be stored
by the Company; and

            WHEREAS, all things necessary to make this Supplemental Mortgage the
valid, binding and legal obligation of the Company, including all proper
corporate action on the part of the Company, have been done and performed and
have happened;

                                        1
<PAGE>

            NOW, THEREFORE, THIS SUPPLEMENTAL MORTGAGE, WITNESSETH, that the
locations listed on Schedule I hereto shall be Designated Locations for purposes
of the Mortgage at which Pledged Spare Parts may be maintained by or on behalf
of the Company.

            This Supplemental Mortgage shall be construed as supplemental to the
Mortgage and shall form a part thereof, and the Mortgage is hereby incorporated
by reference herein and is hereby ratified, approved and confirmed.

            THIS SUPPLEMENTAL MORTGAGE IS DELIVERED IN THE STATE OF NEW YORK.
THIS SUPPLEMENTAL MORTGAGE SHALL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE
WITH, THE LAWS OF THE STATE OF NEW YORK.

            Delivery of an executed counterpart of a signature page to this
Supplemental Mortgage by telecopier shall be effective as delivery of an
original executed counterpart of this Supplemental Mortgage.

            IN WITNESS WHEREOF, this Supplemental Mortgage has been duly
executed and delivered all as of the date first above written.

                                               AMERICA WEST AIRLINES, INC.

                                            By: ________________________________
                                                Name:
                                                Title:

                                        2
<PAGE>

                             SCHEDULE I to EXHIBIT A

                                        3
<PAGE>

                                   SCHEDULE I

                              DESIGNATED LOCATIONS

America West Airlines - ATL
Hartsfield International Airport
6000 N. Terminal Parkway
Atlanta, GA 30320

America West Airlines - BWI
Baltimore/Washington International Airport
Terminal D, Gate 29
Baltimore, MD 21240

America West Airlines - CMH
Port Columbus International Airport
4600 International Gateway
Columbus, OH  43219

America West Airlines - COS
Colorado Springs Municipal Airport
7770 E. Drennan Rd.
Colorado Springs, CO 80916

America West Airlines - DEN
Denver International Airport
8500 Pena Blvd., Concourse C Gate 30
Denver, CO 80249

America West Airlines - JFK
JFK Airport
Building 59 / Terminal 7 - AWA Mx Facility
Jamaica, NY 11430

America West Airlines -LAS
McCarran International Airport
5757 Wayne Newton Blvd.
Las Vegas, NV 89111

<PAGE>

America West Airlines - LAX
Los Angeles International Airport
100 World Way Terminal 1
Los Angeles, CA 90045

America West Airlines -  PHC
Hohokam 10 Business Center #3
4445 E. Elwood Street
Phoenix, AZ  85040

America West Airlines - PDX
Portland International Airport
7000 NE Airport Way
Portland, OR 97218

America West Airlines - PHL
Philadelphia International Airport
Terminal D
Philadelphia, PA 19153

America West Airlines-PHT
Terminal 4
3800 E. Sky Harbor Blvd.
Phoenix, AZ 85034

America West Airlines-PHX
Phoenix Hangar
4000 E. Sky Harbor Blvd.
Phoenix, AZ  85034

America West Airlines - PVR
AeroPuerto International
Gustavo Diaz Ordaz
Puerto Vallarta, Mexico

America West Airlines - SAN
Lindbergh Field
3707 N. Harbor Drive #28
San Diego, CA 92101

                                       2
<PAGE>

America West Airlines - SEA
Seattle-Tacoma International Airport
Main Terminal
Seattle, WA 98158

America West Airlines- SNA
John Wayne Airport-Orange County
18601 N. Airport Way, Suite 238
Santa Ana, CA  92707

                                        3<PAGE>

                                                                   EXHIBIT 10.12

                                                               EXECUTION VERSION

                    SECURITY TRUSTEE AGREEMENT [SPARE PARTS]

                          Dated as of September 3, 2004

                                     between

                           WELLS FARGO BANK NORTHWEST,
                              NATIONAL ASSOCIATION
                         not in its individual capacity,
                       except as expressly stated herein,
                         but solely as Security Trustee

                                       and

                    THE PERSONS NAMED HEREIN AS BENEFICIARIES

<PAGE>

                                TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                                                                                                    Page
<S>               <C>                                                                                               <C>
SECTION 1.        Definitions.....................................................................................   1

SECTION 2.        Authorization and Action........................................................................   1

SECTION 3.        Limitation on Liability.........................................................................   2

SECTION 4.        Resignation and Removal.........................................................................   3

SECTION 5.        Action by Security Trustee Upon Request of Beneficiaries........................................   4

SECTION 6.        Security Trustee Entitled to Receive Opinion of Security Trustee's Counsel......................   5

SECTION 7.        Compensation....................................................................................   5

SECTION 8.        Appointment of Security Co-Trustee(s)...........................................................   5

SECTION 9.        Trust Company Representations and Warranties....................................................   5

SECTION 10.       Distributions...................................................................................   6

SECTION 11.       Miscellaneous...................................................................................   7
</TABLE>

Schedule 1 - Beneficiaries

Schedule 2 - Addresses for Notice

                                      (i)

<PAGE>

      THIS SECURITY TRUSTEE AGREEMENT [SPARE PARTS] (the "Security Trustee
Agreement") is dated as of September 3, 2004, between Wells Fargo Bank
Northwest, National Association, not in its individual capacity, except as
expressly stated herein, but solely as Security Trustee (the "Security Trustee")
and the Persons named as Beneficiaries on Schedule 1 hereto (together with
Affiliates, their respective successors and assigns, collectively, the
"Beneficiaries" and each a "Beneficiary").

      WHEREAS:

      A. Reference is hereby made to the Payment and Indemnity Agreement [Spare
Parts] dated as of the date hereof (the "AWA Payment & Indemnity Agreement") of
America West Airlines, Inc. (the "Obligor") in favor of the Beneficiaries and
the Security Trustee.

      B. Reference is hereby made to the Subordinated Spare Parts Mortgage and
Security Agreement and the related supplements entered into on or after the date
hereof (the "Mortgage") by the Obligor in favor of the Security Trustee with
respect to the Collateral.

      NOW, THEREFORE, in consideration of the agreements herein and in reliance
upon the representations and warranties set forth herein and therein, the
parties agree as follows:

      SECTION 1. Definitions. Unless otherwise defined herein, all capitalized
terms used but not defined herein have the meanings assigned to such terms in
the Mortgage or the Payment & Indemnity Agreement. The following terms, as used
herein, have the following meanings:

      "Collateral" means the Pledged Spare Parts and such other items as are set
forth in Section 2.01 of the Mortgage (and any replacements thereto pursuant to
the terms of the Mortgage).

      "Event of Default" has the meaning assigned to such term in the Mortgage.

      "Operative Documents" means this Security Trustee Agreement, the Payment &
Indemnity Agreement and the Mortgage.

      "Person" has the meaning assigned to in the Mortgage.

      "Required Beneficiaries" means General Electric Capital Corporation or its
successors or assigns.

      SECTION 2. Authorization and Action. (a) Each Beneficiary hereby appoints
the Security Trustee as its security trustee and agent and authorizes the
Security Trustee to take such action as the Security Trustee on such
Beneficiary's behalf and to exercise such powers under this Security Trustee
Agreement, the other Operative Documents as are delegated to the Security
Trustee by the terms hereof and thereof, together with such powers as are
reasonably incidental thereto. The Security Trustee hereby accepts such
appointment. As to any matters not

<PAGE>

expressly provided for by this Security Trustee Agreement and the other
Operative Documents, the Security Trustee shall not be required to exercise any
discretion or take any action, but shall be required to act or to refrain from
acting (and shall be fully protected in so acting or refraining from acting)
upon the instructions of the Required Beneficiaries, and such instructions shall
be binding upon all Beneficiaries; provided, however, that the Security Trustee
shall not be required to take any action which exposes the Security Trustee to
personal liability or which is contrary to this Security Trustee Agreement or
applicable Law. The Security Trustee agrees to give to each Beneficiary (or its
designated agent) prompt notice of each notice given to it pursuant to any
Operative Document.

      (b) No trust relationship between the Security Trustee and the
Beneficiaries, nor any other Person, is created or intended to be created by
this Security Trustee Agreement rather the Security Trustee is solely the agent
of the Beneficiaries for purposes of the collateral granted pursuant to the
Mortgage which secures the obligations of Obligor under the Operative Documents.
The Security Trustee shall have only those powers, duties and obligations as are
expressly set forth in the Operative Documents.

      SECTION 3. Limitation on Liability. (a) Except for the liability of Wells
Fargo Bank Northwest, National Association (the "Trust Company") for the Trust
Company's representations and warranties in Section 9, and for its own gross
negligence and willful misconduct, it is expressly understood and agreed by the
parties hereto that (i) this Security Trustee Agreement is executed and
delivered by the Trust Company, not in its individual capacity but solely as
Security Trustee in the exercise of the powers and authority conferred and
vested in it as the Security Trustee, (ii) nothing herein contained shall be
construed as creating any liability on the Trust Company, individually or
personally, to perform any obligation of the Security Trustee either expressed
or implied contained herein or in the Operative Documents, all such liability,
if any, being expressly waived by the parties to this Security Trustee Agreement
and by any Person claiming by, through or under the parties to this Security
Trustee Agreement and (iii) under no circumstances shall the Trust Company be
personally liable for the payment of any indebtedness or expenses of the
Security Trustee or be liable for the breach or failure of any obligation,
representation, warranty or covenant made or undertaken by the Security Trustee
under this Security Trustee Agreement and the other Operative Documents.

      (b) The recitals and preliminary statements in the Operative Documents
shall be taken as statements by the party or parties thereto (other than the
Security Trustee), and shall not be considered as made by, or as imposing any
obligation or liability upon, the Security Trustee, nor shall the Security
Trustee be held responsible for the value of the Collateral or for the legality
or validity of the Operative Documents, any supplement to any of the above or
any instrument of further assurance except that, as to each of the above to
which the Security Trustee is a party, it is executed and delivered by the
Security Trustee, and that the officer or officers executing and delivering the
same have been duly authorized to do so on behalf of the Security Trustee. No
representation or warranty respecting the rights or remedies of the
Beneficiaries, the Security Trustee's right, title, interest, claim or demand in
or to the Collateral or the condition thereof or the sufficiency of the security
for the Operative Documents is made or implied by the Security Trustee's
execution and delivery hereof or any Operative Document.

                                       2

<PAGE>

      (c) Whenever pursuant to the terms of this Security Trustee Agreement or
the Operative Documents, the Security Trustee is obliged to distribute any sum
of money to the registered Beneficiaries or to any other Person, it is
understood that such obligations are undertaken by it in its capacity as
Security Trustee hereunder, and not in its individual capacity, and that such
payment and disbursement are to be made only from the income and proceeds of any
Collateral and any other security granted pursuant to the Operative Documents
and only to the extent that the Security Trustee has in its hands sufficient
income or proceeds from such Collateral or other security to make such payment
or distribution.

      (d) The Security Trustee shall not be required to take notice or be deemed
to have knowledge of any Event of Default, unless the Security Trustee shall
have actual knowledge thereof or shall receive from a Beneficiary, notice
stating that the same has occurred and is continuing, and specifying the same,
and in the absence of such notice the Security Trustee may conclusively assume
that the same does not exist, except as aforesaid.

      (e) The Security Trustee shall not be subject to any liability whatsoever
to a Beneficiary or any other Person, in tort, contract or otherwise, in
connection with any matter arising from the exercise by the Security Trustee of
any powers or authorities conferred hereunder or for the acts, omissions,
receipts, neglects or defaults of any Person employed or engaged by it as
permitted hereunder or for any loss or damage occasioned by an error in judgment
or oversight on the part of the Security Trustee, or for any other loss, damage
or misfortune which may occur in the execution by the Security Trustee of its
duties hereunder, except for that arising from the Security Trustee's gross
negligence, willful misconduct or bad faith.

      SECTION 4. Resignation and Removal. (a) The Security Trustee may resign
and be discharged hereunder at any time, without cause, by giving at least
thirty (30) days' notice of such resignation to the Obligor and each
Beneficiary, such resignation to be effective on the date specified in the
notice; provided, however that such resignation shall not be effective until a
successor Security Trustee shall have been appointed pursuant to the provisions
below. In addition, the Security Trustee may be removed at any time without
cause by an instrument or concurrent instruments signed by the Required
Beneficiaries, or by their attorneys-in-fact thereunto duly authorized, and
delivered to each Beneficiary. In case of the resignation or removal of the
Security Trustee, or if the Security Trustee shall otherwise become incapable of
acting or shall be taken under the control of any public officer or officers or
of a receiver appointed by a court, then a successor or successors may be
appointed by the Required Beneficiaries; provided that, so long as no Default
shall have occurred and be continuing, such successor or successors shall be
reasonably acceptable to the Obligor. If such Required Beneficiaries shall fail
to make such appointment prior to the date such resignation, removal or other
incapacity is effective, then the Security Trustee or any registered Beneficiary
may request a court of competent jurisdiction to appoint such successor to act
until such time, if any, as a successor shall have been appointed as provided
above. Any successor Security Trustee so appointed by such court shall
immediately and without further act be superseded by a successor Security
Trustee appointed as above provided.

      (b) Upon the acceptance of any appointment as Security Trustee under this
Security Trustee Agreement by a successor Security Trustee, such successor
Security Trustee

                                       3

<PAGE>

shall become vested with all the rights, remedies, duties, obligations and
powers of such predecessor with like effect as if originally named herein as
Security Trustee.

      (c) Any successor to the Security Trustee, however constituted, shall be a
bank or trust company organized and existing under the laws of the United States
of America or any state thereof or organized and having capital funds as of the
date of appointment of such successor (as shown by its most recent financial
statements distributed to its shareholders) aggregating at least US$500,000,000,
if there shall be such a bank or trust company willing and legally qualified to
accept and perform the trusts hereunder and the duties mentioned herein upon
reasonable or customary terms.

      (d) Any Person into which the Security Trustee may be merged or with which
it may be consolidated, any corporation resulting from any merger or
consolidation or conversion to which the Security Trustee shall be a party or
any corporation to which all or substantially all of the corporate trust
business of the Security Trustee may be transferred (whether by operation of Law
or otherwise), shall be the successor to the Security Trustee under this
Security Trustee Agreement without the execution or filing of any paper or any
further act on the part of any of the parties hereto; provided, however, that
notice of the same is given to each Beneficiary, and that any such Person meets
the requirements set forth in Section 4(c).

      SECTION 5. Action by Security Trustee Upon Request of Beneficiaries. (a)
Upon the written request of the Required Beneficiaries, the Security Trustee
shall give its consent to, or take, any action so requested or change under, in
or in respect of the Collateral or the Operative Documents.

      (b) The Security Trustee may decline to follow any such request if (i) the
Security Trustee shall receive an opinion of its counsel to the effect that such
consent or such action or change may not lawfully be made or taken, or (ii) the
Security Trustee shall determine in good faith that such consent or such action
or change would subject the Security Trustee to the risk of any personal
liability or any expense, unless (in cases not involving criminal liability) any
of the Beneficiaries can and do indemnify and hold the Security Trustee
harmless, in form and amount reasonably satisfactory to the Security Trustee,
from and against such liability or expense and provide the Security Trustee with
sufficient funds to cover its expenses with respect to such action.

      (c) The Security Trustee shall not incur any liability to anyone in acting
upon any signature, instrument, notice, resolution, request, consent, order,
certificate, report, opinion, note or other document or paper reasonably
believed by it to be genuine and the Security Trustee shall not be obliged to
make any investigation or inspection to verify the correctness or completeness
of the facts stated in any of the foregoing papers or documents. In the
administration of its duties under the Operative Documents, the Security Trustee
may act directly or through its agents or attorneys and may consult with
counsel, appraisers, engineers, accountants, and other skilled persons to be
selected and employed by it, and the Security Trustee shall not be liable for
anything done, suffered or omitted in good faith by it in accordance with the
advice of any thereof.

                                       4

<PAGE>

      SECTION 6. Security Trustee Entitled to Receive Opinion of Security
Trustee's Counsel. The Security Trustee shall, before taking any action in
respect of an Event of Default, be entitled to receive (if requested by the
Security Trustee) at least five (5) days' prior notice of the action to be taken
and of the form of the instruments involved and an opinion of Security Trustee's
counsel, in form and substance satisfactory to the Security Trustee, stating the
legal effect of such action, the steps necessary to be taken to consummate such
action and that such action will not impair the security for the Beneficiaries
in contravention of the provisions hereof, and such opinion shall be full
protection to the Security Trustee in reliance thereon.

      SECTION 7. Compensation. The Security Trustee shall be entitled to
reasonable compensation ratably from the Obligor for its services and
reimbursement ratably by the Obligor for all proper disbursements of every sort
and nature incurred by it, including reasonable fees and expenses of the
Security Trustee's counsel and appraisers, engineers, accountants and other
skilled persons properly employed by the Security Trustee, pursuant to terms
hereof, the Operative Documents or in taking any action upon an Event of Default
or in instituting, appearing in or defending any proceeding with respect thereto
and for all other expenses incurred by it hereunder and for all taxes which may
be assessed against the Security Trustee as such or against any funds on deposit
with the Security Trustee and for all statutory penalties and other payments
which the Security Trustee may be required to pay or make; provided, however,
that the Security Trustee shall not be entitled to compensation or
reimbursements if such disbursements are necessary as the result of the Security
Trustee's own bad faith, gross negligence or willful misconduct.

      SECTION 8. Appointment of Security Co-Trustee(s). At any time or times, in
order to comply with any legal requirement in any jurisdiction, the Security
Trustee may, and if directed in writing by the Required Beneficiaries shall,
appoint another bank or trust company or one or more other Persons, either to
act as security co-trustee(s), jointly with the Security Trustee, or to act as
separate security trustee(s) on behalf of the Beneficiaries. The Security
Trustee shall be not personally liable by reason of any act or omission of any
such security trustee(s) or security co-trustee(s), as the case may be,
appointed under this Section 8, if the Required Beneficiaries have approved the
appointment of such security trustee(s) or security co-trustee(s), as the case
may be.

      SECTION 9. Trust Company Representations and Warranties. The Trust
Company, in its individual capacity and not as Security Trustee, hereby
represents and warrants to each Beneficiary that the following shall be true and
correct on and as of the date first above written (unless otherwise specified):

      (a) Powers and Authorizations. It is a national banking association duly
organized and validly existing in good standing under the laws of the United
States and has full power and authority, in its individual capacity, to execute
and deliver this Security Trustee Agreement and (assuming the due authorization,
execution and delivery of this Agreement by the other parties hereto) perform
its obligations hereunder. The execution, delivery and performance by the
Security Trustee of the Operative Documents to which it is or will be a party
have been duly authorized by all necessary action on its part and do not
contravene the Charter or By-laws of the Security Trustee; and the Operative
Documents to which the Security Trustee is or will be a party have been duly
authorized, executed and delivered by the Security Trustee and constitute

                                       5

<PAGE>

the legal, valid and binding obligations, enforceable against it in accordance
with its terms. This Security Trustee Agreement and the other Operative
Documents to which the Security Trustee is or will be a party, upon the due
execution and delivery hereof, will constitute the legal, valid and binding
obligations of the Security Trustee in its individual capacity, and the
performance by the Security Trustee (in its individual or trust capacity, as the
case may be) of any of its obligations hereunder and thereunder does not
contravene any federal law or regulation or contractual restriction binding on
or governing the banking or trust powers of the Security Trustee (in its
individual or trust capacity, as the case may be);.

      (b) Pending Litigation. There are no pending (or, to the Security
Trustee's knowledge, threatened) actions, suits, investigations or proceedings
against or affecting it before any court, arbitrator, or administrative or
governmental body which, individually or in the aggregate, if decided adversely
to the interests of the Security Trustee would materially and adversely affect
the ability of the Security Trustee, either in its individual capacity or as
Security Trustee, as the case may be, to perform its obligations under this
Security Trustee Agreement or any other Operative Document or which questions or
would affect the legality or validity of this Security Trustee Agreement or such
Operative Document; and

      (c) No Legal Bar. Neither the execution and delivery by the Security
Trustee of this Security Trustee Agreement or any other Operative Document nor
the consummation by the Security Trustee of any of the transactions contemplated
hereby or thereby requires or will require the consent or approval of or the
giving of notice to, the registration with, or the taking of any other action in
respect of, any federal or governmental authority or agency governing its
banking or trust powers.

      SECTION 10. Distributions. (a) Any time and from time to time, any
Beneficiary may give notice to the Security Trustee substantially in the form of
Annex A hereto.

      (b) Within 10 days following receipt by the Security Trustee of a notice
from a Beneficiary substantially in the form of Annex A hereto, the Security
Trustee shall send a notice to each Beneficiary substantially in the form of
Annex B hereto.

      (c) Within 30 days of receipt of a notice from the Security Trustee
substantially in the form of Annex B hereto each Beneficiary shall certify to
the Security Trustee in writing the full amount then owing to such Beneficiary
under any of the Operative Documents. The Security Trustee may rely on such
certifications for the purposes of this Section 10.

      (d) Upon the occurrence of an Event of Default, after deducting all
amounts owing to the Security Trustee for compensation, reimbursement of
expenses and indemnity, including, without limitation, its reasonable
compensation and expenses for the services of attorneys, servants and agents of
Security Trustee properly engaged and employed (including compensation and
expenses in connection with any appeal), the Security Trustee shall apply the
moneys received by it in respect of any Collateral arising from the exercise of
the remedies set forth in the Mortgage, first, to the payment to the
Beneficiaries of all amounts owing to the Beneficiaries under the applicable
Operative Documents; provided that if the amount to be applied pursuant to this
clause "first" is less than the sum of such amounts owing to the Beneficiaries,
then the amount to be applied shall be applied in accordance with the
instructions

                                       6

<PAGE>

of the Required Beneficiaries; second, the excess, if any, to be held by the
Security Trustee pursuant to the Mortgage until the Lien of the Mortgage shall
have been terminated; and third, the excess, if any, to the Obligor.

      SECTION 11. Miscellaneous. (a) Survival. Except as otherwise expressly
provided herein, the parties' obligations under this Security Trustee Agreement
shall terminate upon the release of the Lien of the Mortgage.

      (b) Third Party Beneficiary. The Obligor shall be an express third party
beneficiary to this Agreement to the extent the provisions or the Agreement by
their terms confer upon the Obligor any right under this Agreement.

      (c) Notices. All notices, consents, directions, approvals, instructions,
requests and other communications given to any party hereto shall be in writing
to such party at the address set forth in Schedule 2 hereto or, in any such
case, at such other address as such party shall designate by notice to each of
the other parties hereto and may be personally delivered (including delivery by
private courier services) or by telecopy (with a copy of such notice sent by
private courier service for overnight delivery or by registered or certified
mail), to the party entitled thereto, and shall be deemed to be duly given or
made when delivered by hand unless such day is not a Business Day, in which case
such delivery shall be deemed to be made as of the next succeeding Business Day
or in the case of telecopy (with a copy of such notice sent by private courier
service for overnight delivery or by registered or certified mail), when sent,
so long as it was received during normal business hours of the receiving party
on a Business Day and otherwise such delivery shall be deemed to be made as of
the next succeeding Business Day.

      (d) Severability. If any provision hereof or the application thereof to
any Person or circumstance shall be invalid, illegal or unenforceable, the
remaining provisions or the application of such provision to Persons or
circumstances other than those as to which it is invalid or enforceable, shall
continue to be valid and enforceable.

      (e) Amendments, Etc. No amendment or waiver of any provision of this
Security Trustee Agreement shall in any event be effective unless the same shall
be in writing and signed by the Required Beneficiaries and the Security Trustee
and, in the case of any amendment or waiver of Section 10, acknowledged by the
Obligor, and then such waiver or consent shall be effective only in the specific
instance and for the specific purpose for which given.

      (f) Headings. The headings of Sections and subsections of this Security
Trustee Agreement are for convenience only and shall not affect the meaning of
this Security Trustee Agreement.

      (g) Benefit. The parties hereto and their permitted successors and
assigns, but no others, shall be bound hereby and entitled to the benefit
hereof.

      (h) Counterparts. The parties may sign this Security Trustee Agreement in
any number of counterparts and on separate counterparts, each of which shall be
an original but all of which together shall constitute one and the same
instrument.

                                       7

<PAGE>

      (i) Governing Law and Jurisdiction; Waiver of Trial by Jury.

            (i) THIS AGREEMENT HAS BEEN DELIVERED IN THE STATE OF NEW YORK AND
SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF
NEW YORK, INCLUDING ALL MATTERS OF CONSTRUCTION, VALIDITY AND PERFORMANCE, AND
THE OBLIGATIONS, RIGHTS AND REMEDIES OF THE PARTIES HEREUNDER SHALL BE
DETERMINED IN ACCORDANCE WITH SUCH LAWS.

            (ii) Each of the parties hereto, to the extent it may do so under
Applicable Law, for purposes hereof and of all other Operative Documents hereby
(a) irrevocably submits itself to the non-exclusive jurisdiction of the courts
of the State of New York sitting in the City of New York and to the
non-exclusive jurisdiction of the United States District Court for the Southern
District of New York, for the purposes of any suit, action or other proceeding
arising out of this Agreement, the subject matter hereof or any of the
transactions contemplated hereby brought by any party or parties hereto, or
their successors or permitted assigns and (b) waives, and agrees not to assert,
by way of motion, as a defense, or otherwise, in any such suit, action or
proceeding, that the suit, action or proceeding is brought in an inconvenient
forum, that the venue of the suit, action or proceeding is improper or that this
Agreement or the subject matter hereof or any of the transactions contemplated
hereby may not be enforced in or by such courts.

            (iii) TO THE EXTENT PERMITTED BY APPLICABLE LAW, EACH OF THE PARTIES
HERETO IRREVOCABLY WAIVES ALL RIGHT TO TRIAL BY JURY IN ANY ACTION, PROCEEDING
OR COUNTERCLAIM TO WHICH THEY ARE PARTIES INVOLVING, DIRECTLY OR INDIRECTLY ANY
MATTER (WHETHER BASED ON CONTRACT, TORT OR OTHERWISE) IN ANY WAY ARISING OUT OF,
RELATED TO, OR CONNECTED WITH THIS AGREEMENT OR ANY RESPECT OF THE TRANSACTIONS
CONTEMPLATED HEREBY OR THE ACTIONS OF THE PARTIES HERETO IN THE NEGOTIATION,
ADMINISTRATION, PERFORMANCE OR ENFORCEMENT THEREOF.

      (j)  Documents. Each of the parties hereto does hereby covenant and agree
to perform and be governed and restricted by the Operative Documents to which it
is a party and, subject to the terms and conditions thereof, to take or cause to
be taken, all actions and to do, or cause to be done, all things necessary,
proper or advisable in connection therewith.

                                       8

<PAGE>

      IN WITNESS WHEREOF, the parties hereto have caused this Security Trustee
Agreement to be duly executed by their respective officers thereunto duly
authorized as of the day and year first above written.

                          SECURITY TRUSTEE:

                          WELLS FARGO BANK NORTHWEST,
                          NATIONAL ASSOCIATION,
                          not in its individual capacity, except as expressly
                          stated herein, but solely as Security Trustee

                          By  /s/ Michael D. Hoggan
                             _______________________________
                             Name: Michael D. Hoggan
                             Title: Vice President

<PAGE>

                          BENEFICIARIES:

                          GENERAL ELECTRIC CAPITAL CORPORATION,
                                as Beneficiary

                          By: /s/ Norman Liu
                             _________________________________
                             Name: Norman Liu
                             Title: Vice President

                          CASTLE HARBOUR LEASING INC., as Beneficiary

                          By: /s/ Norman Liu
                             _______________________________

                              Name: Norman Liu
                              Title: Vice President

                          POLARIS HOLDING COMPANY, as Beneficiary

                          By: /s/ Norman Liu
                             _______________________________

                              Name: Norman Liu
                              Title: Vice President

                          AIRCRAFT SERVICES CORPORATION, as Beneficiary

                          By: /s/ Norman Liu
                              _______________________________

                              Name: Norman Liu
                              Title: Vice President

<PAGE>

                          CASTLE HARBOUR-I LIMITED-LIABILITY
                          COMPANY, as Beneficiary

                          By: /s/ Edward Sun
                              -------------------------------
                              Name: Edward Sun
                              Title: General Manager

                          HELLER FINANCIAL LEASING, INC., as Beneficiary

                          By: /s/ Norman Liu
                              -------------------------------
                              Name: Norman Liu
                              Title: Vice President

                          HELLER EMX, INC., as Beneficiary

                          By: /s/ Norman Liu
                              -------------------------------
                              Name: Norman Liu
                              Title: Vice President

                          AFS INVESTMENTS XI, INC., as Beneficiary

                          By: /s/ Norman Liu
                              -------------------------------
                              Name: Norman Liu
                              Title: Vice President

                          POLARIS LEASING INTERNATIONAL, INC., as Beneficiary

                          By: /s/ Norman Liu
                              -------------------------------
                              Name: Norman Liu
                              Title: Vice President

<PAGE>

                          AFS INVESTMENTS XV LLC, as Beneficiary, by its member,
                          AFS Investments XV, Inc.

                          By: /s/ Norman Liu
                              -------------------------------
                              Name: Norman Liu
                              Title: Vice President

                          AFS INVESTMENTS XLI LLC, as Beneficiary, by its
                          member, AFS Investments XLI, Inc.

                          By: /s/ Norman Liu
                              -------------------------------
                              Name: Norman Liu
                              Title: Vice President

                          AFS INVESTMENTS XLII LLC, as Beneficiary, by its
                          member, AFS Investments XLII, Inc.

                          By: /s/ Norman Liu
                              -------------------------------
                              Name: Norman Liu
                              Title: Vice President

                          AVIATION FINANCIAL SERVICES INC., as Beneficiary

                          By: /s/ Norman Liu
                              -------------------------------
                              Name: Norman Liu
                              Title: Vice President

                          PK AIRFINANCE S.A.R.L., as Beneficiary

                          By: /s/ Michael Kriedberg
                              -------------------------------
                              Name: Michael Kriedberg
                              Title: Director

<PAGE>

                                                                      SCHEDULE 1

                                  BENEFICIARIES

1.    General Electric Capital Corporation

2.    Castle Harbour Leasing Inc.

3.    Polaris Holding Company

4.    Aircraft Services Corporation

5.    Castle Harbour-I Limited-Liability Company

6.    Heller Financial Leasing, Inc.

7.    Heller EMX, Inc.

8.    AFS Investments XI, Inc.

9.    Polaris Leasing International, Inc.

10.   AFS Investments XV LLC

11.   AFS Investments XLI LLC

12.   AFS Investments XLII LLC

13.   Aviation Financial Services Inc.

14.   PK AirFinance S.A.R.L.

<PAGE>

                                                                      SCHEDULE 2

                                 NOTICE DETAILS

If to the Security Trustee, to:

            Wells Fargo Bank Northwest, National Association
            MAC: U1228-120
            299 South Main Street
            12th Floor
            Salt Lake City, Utah 84111
            Attention:  Corporate Trust Services

            Telephone:        (801) 246-5630
            Fax No.           (801) 246-5053
            E-mail:           michael.hoggan@wellsfargo.com

If to any of the Beneficairies, to:

            General Electric Capital Corporation
            c/o GE Capital Aviation Services, Inc.
            201 High Ridge Road
            Stamford, CT  06927

            Attention:        Customer Services
            Telecopy:         (203) 357 3201
            Email:            Nanotices@gecas.com

<PAGE>

                                                                         Annex A

[Date]

TO:

Wells Fargo Bank Northwest, National Association

                         Re: America West Airlines, Inc.

We refer to the Security Trustee Agreement [Spare Parts] dated as of September
3, 2004 ("Security Trustee Agreement") between Wells Fargo Bank Northwest,
National Association as Security Trustee and the persons named therein as
Beneficiaries. Capitalized terms herein not defined shall have the same meanings
as set forth in the Security Trustee Agreement.

The undersigned hereby (a) certifies to you that the undersigned is a
Beneficiary and (b) requests you, pursuant to Section 10(a) of the Security
Trustee Agreement, to send a notice to each Beneficiary substantially in the
form of Annex B to the Security Trustee Agreement.

                          [NAME OF BENEFICIARY]

                          By_______________________________
                          Name:
                          Title:

<PAGE>

                                                                         Annex B

[Date]

TO:
[Name of Beneficiary] ("Beneficiary")
[Address of Beneficiary]

                         Re: America West Airlines, Inc.

In our capacity as Security Trustee under the Security Trustee Agreement [Spare
Parts] dated as of September 3, 2004 ("Security Trustee Agreement") between
Wells Fargo Bank Northwest, National Association, as Security Trustee, and the
persons named therein as Beneficiaries (capitalized terms herein not defined
shall have the same meanings as set forth in the Security Trustee Agreement) we
hereby request that you certify to the undersigned in writing, within 30 days of
receipt of this notice, the full amount owing to the Beneficiary under the
Payment & Indemnity Agreement.

Such certification referred to above shall attach a copy of this letter and be
sent to:

      WELLS FARGO BANK NORTHWEST,
      NATIONAL ASSOCIATION ("Security Trustee")

      [________________]
      Attention: [____________]
      (Telecopy No. [_________])

                              WELLS FARGO BANK NORTHWEST,
                              NATIONAL ASSOCIATION,
                              not in its individual capacity, except as
                              expressly stated herein, but solely as
                              Security Trustee

                              By_______________________________
                              Name:
                              Title:

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