<PAGE>

                                                                    EXHIBIT 10.4

                                                               EXECUTION VERSION

================================================================================

               SUBORDINATED ENGINE 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

================================================================================
<PAGE>

                                TABLE OF CONTENTS

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

ARTICLE 2.  SECURITY .............................................................................    1
      Section 2.01.  Grant of Security Interest...................................................    1

ARTICLE 3.  COVENANTS OF THE COMPANY..............................................................    5
      Section 3.01.  Liens........................................................................    5
      Section 3.02.  Possession, Operation and Use, Maintenance and Registration.................     6
      Section 3.03.  Replacement and Pooling of Parts; Alterations, Modifications and Additions...   12
      Section 3.04.  Event of Loss and Release of Engines.........................................   14
      Section 3.05.  Insurance....................................................................   21
      Section 3.06.  Filings......................................................................   22
      Section 3.07.  Merger, Consolidation........................................................   22
      Section 3.08.  Notice of Change of the Company's Location...................................   23
      Section 3.09.  Inspection...................................................................   23

ARTICLE 4.  REMEDIES OF THE SECURITY TRUSTEE UPON A SUBORDINATED EVENT OF DEFAULT.................   24
      Section 4.01.  Remedies with Respect to Collateral..........................................   24
      Section 4.02.  Remedies Cumulative..........................................................   27
      Section 4.03.  Discontinuance of Proceedings................................................   27
      Section 4.04.  Allocation of Payments.......................................................   28
      Section 4.05.  Turnover of Payments to Senior Trustee.......................................   28

ARTICLE 5.  INTENTIONALLY LEFT BLANK

ARTICLE 6.  SECURITY FUNDS
      Section 6.01.  Investment of Security Funds.................................................   29

ARTICLE 7.  MISCELLANEOUS.........................................................................   29
      Section 7.01.  Termination of Mortgage......................................................   29
      Section 7.02.  Alterations to Mortgage......................................................   30
      Section 7.03.  No Legal Title to Collateral.................................................   30
      Section 7.04.  Sale of the Engines by Security Trustee Is Binding...........................   30
      Section 7.05.  Benefit of Mortgage..........................................................   30
      Section 7.06.  Section 1110 of the Bankruptcy Code..........................................   30
      Section 7.07.  Notices......................................................................   31
      Section 7.08.  Severability.................................................................   31
      Section 7.09.  Separate Counterparts........................................................   32
</TABLE>

                                       (i)

<PAGE>

<TABLE>
      <S>                                                                                           <C>
      Section 7.10.  Successors and Assigns.......................................................  32
      Section 7.11.  Headings.....................................................................  32
      Section 7.12.  Governing Law; Submission to Jurisdiction; Venue.............................  32
      Section 7.13.  WAIVER OF TRIAL BY JURY......................................................  32
      Section 7.14.  Governing Law................................................................  33

APPENDIX A                              Definitions

APPENDIX B                              Insurance

EXHIBIT A                               Mortgage Supplement

EXHIBIT B                               Form of Letter of Credit

SCHEDULE I                              List of Permitted Countries
</TABLE>

                                     (ii)

<PAGE>

               SUBORDINATED ENGINE MORTGAGE AND SECURITY AGREEMENT

            This SUBORDINATED ENGINE 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 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 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.

                                   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

<PAGE>
                                                                               2

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) the Engines, each of which Engines has 750 or more rated takeoff
      horsepower or the equivalent of such horsepower (as more particularly
      described in each Mortgage Supplement executed and delivered in connection
      herewith), as the same is now and will hereafter be constituted, whether
      now owned or hereafter acquired, and whether or not any such Engine from
      time to time is installed on an airframe, together with (a) all Parts of
      whatever nature, which are from time to time included within the
      definition of "Engines", whether now owned or hereafter acquired,
      including all substitutions, renewals and replacements of and additions,
      improvements, accessions and accumulations to the Engines and (b) all
      Engine Documents;

            (b) all warranty rights with respect to the Engines or any Part
      thereof that the Company may have to the extent that such warranty rights
      are assignable (the "Warranties") (it being understood that the Company
      has no obligation to obtain an assignment or consent or to take any
      further action with respect to the security interest granted pursuant to
      this clause (other than to include such Collateral in any UCC financing
      statements and continuation statements) notwithstanding any obligation of
      the Company in any Operative Document (including the last paragraph of
      this Section 2.01) to execute and deliver further instruments and
      documents or provide other further assurances, except that, if an Event of
      Default shall have occurred and be continuing, the Company will take
      reasonable action requested by the Security Trustee for the assignment of
      material Warranties with respect to an Engine to any person acquiring such
      Engine pursuant to Article 4); in each case together with all rights,
      powers, privileges, options and other benefits of the Company thereunder
      with respect to the Engines, including, without limitation, the right to
      make claims thereunder, and to do any and all other things which the
      Company is or may be entitled to do thereunder;

            (c) each assigned Lease (to the extent assigned under any Lease
      assignment), and including, without limitation, all rents or other
      payments of any kind made under such assigned Lease, all collateral
      security or credit support with respect to such assigned Lease (in the
      nature of a guarantee, letter of credit, credit insurance, Lien on or
      security interest in any property or otherwise) for the obligations of the
      lessee thereunder (if any), and all rights of the Company to execute any
      election or option or to give any notice, consent, waiver, or approval
      under or with respect to any thereof or to accept any surrender of any
      Engine or any part thereof as well as any rights, powers or

<PAGE>

                                                                              3

      remedies on the part of the Company, whether arising under such assigned
      Lease or by statute or at law or in equity, or otherwise, arising out of
      any default under such assigned Lease (it being understood that, so long
      as no Event of Default shall have occurred and be continuing, the Company
      shall retain all rights as lessor under such Lease, including to receive
      all such payments thereunder, to hold, dispose of, or relinquish any such
      collateral or credit support and to take or refrain from taking all
      actions thereunder) (to the extent assigned under such Lease assignment);

            (d) all proceeds with respect to the requisition of title to the
      Engines or any part thereof, and all insurance proceeds with respect to
      the Engines or any part thereof, but excluding any insurance maintained by
      the Company and not required under Section 3.05;

            (e) all Eligible Accounts; all cash, Permitted Investments and other
      financial assets held therein by the Security Trustee or an Eligible
      Institution or otherwise paid or deposited to or with the Security Trustee
      or an Eligible Institution and held or required to be held by the Security
      Trustee or an Eligible Institution hereunder; and all security
      entitlements (as defined in Article 8 of the New York UCC) with respect
      thereto; and

            (f) 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 Engines and the other Collateral,
and peaceably and quietly, without hindrance or molestation, to possess, use,
retain and control the Engines and the other Collateral, and (ii) the Company
shall have the right, to the exclusion of the Security Trustee, with respect to
the Warranties, to exercise in the Company's name all rights and powers as the
beneficiary of the Warranties and to retain any recovery or benefit resulting
from the enforcement of any warranty or indemnity under the Warranties;

            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 any assigned
Lease and the Warranties 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
any assigned Lease and the Warranties 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
assigned Lease and the Warranties, 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

<PAGE>

                                                                               4

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 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.

<PAGE>
                                                                               5

                                   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 (or any Lessee) 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 Engine 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 Engine or adversely affect the Lien of this
      Mortgage;

            (e) Liens arising out of any judgment or award against the Company
      (or against any Lessee), 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 Engine, 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) any other Lien with respect to which the Company (or any Lessee)
      shall have provided a bond, cash collateral or other security adequate in
      the reasonable opinion of the Security Trustee;

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

            (h) Liens attributable to the Security Trustee; and

<PAGE>
                                                                               6

                  (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, Operation and Use, Maintenance and
Registration.

                  (a) Possession. Except as expressly provided herein, the
Company shall not, without the prior written consent of the Security Trustee,
sell, lease or otherwise in any manner deliver, transfer or relinquish
possession of any Engine; provided that if and for so long as all approvals,
consents or authorizations required in connection with any such lease or such
delivery, transfer or relinquishment of possession by the FAA (or, if at the
time thereof, the Engine is installed on an airframe registered with any
non-U.S. Government Entity, such other Government Entity) have been obtained and
remain in full force and effect, then the Company may, without the prior written
consent of the Security Trustee:

            (i) so long as no Event of Default shall have occurred and be
      continuing, subject or permit any Lessee to subject any Engine to normal
      interchange, pooling or borrowing, or similar arrangements with persons
      who are domiciled in the United States, in each case for no more than six
      months and customary in the airline industry and entered into in writing
      by the Company (or any Lessee) in the ordinary course of its business;
      provided that (A) no such agreement or arrangement shall contemplate,
      require or result in the transfer of title to such Engine, (B) if the
      Company's title to any Engine shall be divested under any such agreement
      or arrangement, such divestiture shall be deemed to be an Event of Loss
      with respect to such Engine and the Company shall comply with Section
      3.04(a) hereof in respect thereof, and (C) the Company (or a Lessee) shall
      not relinquish possession of an Engine pursuant to this clause (i) for a
      period longer than 180 consecutive days;

            (ii) deliver or permit any Lessee to deliver possession of any
      Engine or any Part (A) to the manufacturer thereof or to any FAA certified
      third-party maintenance provider (or certified by a foreign authority so
      long as work performed on such Engine or Part shall comply with Section
      3.02(c)), for testing, service, repair, maintenance or overhaul work on
      such Engine or Part or to the extent required or permitted by the terms of
      Section 3.03(d) for alterations or modifications in or additions to such
      Engine or Part or (B) to licensed or bonded common carriers qualified in
      the shipping and transport of items such as such Engine or Part for the
      purpose of transport to a Person referred to in the preceding clause (A);
      provided that, if an Event of Default shall have occurred and be
      continuing, then, prior to delivering (permitting delivery of) possession
      of any Engine or Part to any Person described in clause (A), the Company
      shall put into place such measures as are reasonably satisfactory to the
      Senior Trustee (if the Lien of the Senior Mortgage shall not then have
      been discharged) or the Security Trustee (if the Lien of the Senior
      Mortgage shall then have been discharged) to ensure that such Person shall
      not assert a Lien against such Engine or Part and shall not have any other
      right of detention of such Engine or Part;
<PAGE>

                                                                               7

            (iii) install or permit any Lessee to install an Engine on an
      airframe owned by the Company (or such Lessee) free and clear of all
      Liens, except: (A) those of the type permitted under clauses (c), (d), (e)
      and (f) of Section 3.01 and those that apply only to the engines (other
      than Engines) and/or only to parts, appliances, instruments,
      appurtenances, accessories, furnishings and other equipment (other than
      Parts), and (B) the rights of third parties under normal interchange,
      pooling or borrowing, or similar arrangements which would be permitted
      under clause (i) above;

            (iv) install or permit any Lessee to install an Engine on an
      airframe leased to the Company (or such Lessee) or owned by the Company
      (or such Lessee) subject to a mortgage, conditional sale or other security
      agreement; provided that (x) such airframe is free and clear of all Liens,
      except: (A) the rights of the parties to the lease or conditional sale or
      other security agreement covering such airframe, or their assignees, and
      (B) Liens of the type permitted by subclauses (A) and (B) of clause (iii)
      of this Section 3.02(a) and (y) the Company or Lessee, as the case may be,
      shall have received from the lessor, mortgagee, secured party or
      conditional seller, in respect of such airframe, a written agreement
      (which may be a copy of the lease, mortgage, security agreement,
      conditional sale or other agreement covering such airframe), whereby such
      Person agrees that neither such Person nor its successors or assigns will
      acquire or claim any right, title or interest in, or Lien on, such Engine
      by reason of such Engine being installed on such airframe at any time
      while such Engine is subject to the Lien of this Mortgage;

            (v) so long as no Event of Default shall have occurred and be
      continuing, install or permit any Lessee to install an Engine on an
      airframe leased to the Company (or such Lessee) or owned by the Company
      (or such Lessee) subject to a mortgage, conditional sale or other security
      agreement under circumstances where neither clause (iii) nor clause (iv)
      of this Section 3.02(a) is applicable; provided that such Engine shall be
      deemed to have suffered an Event of Loss as of the date of such
      installation and the Company shall (or shall cause such Lessee to) comply
      with Section 3.04(a) hereof in respect thereof (it being understood that
      until Section 3.04(a) has been fully complied with the Lien of this
      Mortgage on any such Engine shall continue in full force and effect);

            (vi) transfer possession of any Engine to the U.S. Government
      pursuant to the Civil Reserve Air Fleet Program or any similar program, so
      long as the Company shall promptly notify the Security Trustee thereof
      and, in the case of a transfer pursuant to the Civil Reserve Air Fleet
      Program, provide the Security Trustee with the name, address and telephone
      number of the Contracting Office Representative for the Air Mobility
      Command of the United States Air Force to whom notice must be given
      pursuant to Section 4.01(a);

            (vii) so long as no Special Default or Event of Default shall have
      occurred and be continuing, enter into a lease with the U.S. Government
      under which the lessee's obligations are guaranteed or supported by the
      full faith and credit of the United States, but only if such lease
      complies, or the Company shall comply, as the case may be, with the
      requirements of subclauses (A)(to the extent practicable), (C)(i) (other
      than with respect to insurance), (C)(ii)-(iii), and (J) of Section
      3.02(a)(viii); or

<PAGE>

                                                                               8

      (viii) so long as no Special Default or Event of Default shall have
occurred and be continuing, enter into any lease with respect to any Engine with
any Permitted Air Carrier, but only if:

            (A) the Company shall provide at least 15 days' advance written
      notice to the Security Trustee;

            (B) At the time that the Company enters into such lease, such
      Permitted Air Carrier shall not be insolvent (it being agreed that, for
      purposes hereof, "insolvent" shall mean not paying its debts as they
      become due) or subject to any bankruptcy, insolvency, liquidation,
      reorganization, dissolution or similar proceeding, shall not be seeking
      any reorganization or any readjustment of its debts and shall not be, and
      shall not have substantially all of its property, in the possession of any
      liquidator, trustee, receiver or similar person;

            (C) Any such lease (i) shall include provisions for the maintenance,
      operation, possession, inspection and insurance of such Engine that are
      substantially the same as, or (from a lessor's perspective) more favorable
      than, the applicable provisions of Sections 3.02(a), 3.02(b), 3.02(c),
      3.05 and 3.09, and (ii) shall provide that such Permitted Air Carrier may
      not further lease or transfer its interests (except transfers of the type
      permitted in clauses (i) through (vi), inclusive, of Section 3.02(a)) in
      such Engine;

            (D) In connection with a lease to a Permitted Air Carrier which is
      not a U.S. Air Carrier, all necessary governmental approvals, if any,
      required for such Engine to be imported to, and exported from (upon
      repossession thereof by the Security Trustee or other termination or
      expiration of such lease), the applicable jurisdiction shall have been
      obtained prior to commencement of any such lease, and any foreign exchange
      permits necessary to allow all rent and other payments provided for under
      such lease shall be in full force and effect; and the Company shall have
      provided to the Security Trustee a power-of-attorney, reasonably
      satisfactory in form and substance to the Security Trustee and, to the
      extent permitted by applicable Law, valid and enforceable in the
      applicable jurisdiction, permitting the Security Trustee to exercise all
      rights of the Company under such lease in such jurisdiction, upon the
      occurrence and continuation of a Subordinated Event of Default after the
      Lien of the Senior Mortgage shall have been discharged;

            (E) In connection with a lease to a Permitted Air Carrier which is
      not a U.S. Air Carrier, (aa) either the jurisdiction in which such
      Permitted Air Carrier is based maintains normal diplomatic relations with
      the United States, or such Permitted Air Carrier is based in Taiwan,
      Republic of China (which shall be deemed an acceptable jurisdiction
      notwithstanding the absence of normal diplomatic relations with the United
      States), and (bb) the Company shall have furnished the Security Trustee a
      favorable opinion of counsel, reasonably satisfactory to the Security
      Trustee, in the country of domicile of such Permitted Air Carrier, in form
      and substance reasonably satisfactory to the Security Trustee,

<PAGE>

                                                                               9

      that, subject to customary exceptions and qualifications: (i) the terms of
      such lease and this Mortgage are the legal, valid and binding obligations
      of the parties thereto enforceable under the Laws of such jurisdiction,
      (ii) it is not necessary for any Secured Party to register or qualify to
      do business in such jurisdiction, if not already so registered or
      qualified, as a result, in whole or in part, of the proposed lease, (iii)
      the Security Trustee's Lien in respect of such Engine will be recognized
      in such jurisdiction and the Security Trustee shall have a second-priority
      (or, if the Lien of the Senior Mortgage shall have been discharged,
      first-priority) perfected security interest (subject to Permitted Liens)
      in the Engines subject to such Lease under the Laws of such jurisdiction,
      (iv) the Laws of such jurisdiction of domicile require fair compensation
      by the government of such jurisdiction, payable in a currency freely
      convertible into Dollars, for the loss of use of or title to such Engine
      in the event of the requisition by such government of such use or title
      (unless the Company shall provide insurance in the amounts required with
      respect to hull insurance under Section 3.05 covering the requisition of
      use of or title to such Engine by the government of such jurisdiction so
      long as such Engine is subject to such lease) and (v) the agreement of
      such Permitted Air Carrier that its rights under the lease are subject and
      subordinate to all the terms of this Mortgage is enforceable against such
      Permitted Air Carrier under applicable Law and the Security Trustee shall
      be able to repossess such Engine, and return it to the United States,
      without undue expense, penalty or delay, upon the occurrence and
      continuation of a Subordinated Event of Default after the Lien of the
      Senior Mortgage shall have been discharged;

            (F) The Company shall furnish to the Security Trustee evidence
      reasonably satisfactory to the Security Trustee that the insurance
      required by Section 3.05 remains in effect;

            (G) All necessary action, if any, shall have been taken to continue
      in full force and effect (i) the perfection of the Security Trustee's
      second-priority (or, if the Lien of the Senior Mortgage shall have been
      discharged, first-priority) perfected Lien on such Engine (subject to
      Permitted Liens) and (ii) the Security Trustee's rights under this
      Mortgage;

            (H) All necessary documents shall have been duly filed, registered
      or recorded in such public offices as may be required fully to preserve
      the priority of the interest of the Security Trustee in such Engine;

            (I) Each such lease shall be assigned by the Company to the Security
      Trustee as security for the performance of all of the Company's
      obligations under this Mortgage (with the Company retaining all rights of
      lessor thereunder, to the extent consistent with this Section
      3.02(a)(viii), if and for so long as there shall not have occurred and be
      continuing an Event of Default), with the express consent of such
      Permitted Air Carrier;

            (J) The Company shall furnish to the Security Trustee a written
      confirmation (which may be contained in any relevant operative agreement)
      from

<PAGE>

                                                                              10

      the lessee and any owner, lessor or mortgagee of any aircraft on which
      such Engine is installed by such Lessee that each such party shall
      recognize the Company's rights and interests in, and the rights and
      interests of the Security Trustee in the leased Engine and,
      notwithstanding any contrary provisions of applicable Laws, its rights and
      benefits under which are hereby waived to the extent in conflict with this
      provision, no such party shall claim, as against the Company or the
      Security Trustee, any right, title or interest in such Engine as a result
      of such Engine being subject to such lease or installed on any aircraft as
      a result of such lease; and

            (K) The Company shall reimburse the reasonable out-of-pocket fees
      and expenses, including, without limitation, reasonable fees and
      disbursements of counsel, incurred by the Security Trustee in connection
      with any such lease.

            Notwithstanding anything to the contrary in this Section 3.02(a),
the rights of any Lessee or other transferee who receives possession of an
Engine by reason of a transfer permitted by this Section 3.02(a) (other than the
transfer of an Engine which is deemed an Event of Loss) shall be subject and
subordinate to, and any lease permitted by this Section 3.02(a) shall include a
provision that makes it expressly subject and subordinate to, all the terms of
this Mortgage and to the Lien of this Mortgage, including, without limitation,
(i) the Security Trustee's rights to foreclosure and possession pursuant to
Section 4.01, (ii) the Security Trustee's right to terminate and avoid such
lease, delivery, transfer or relinquishment of possession upon the occurrence
and continuation of a Subordinated Event of Default after the Lien of the Senior
Mortgage shall have been discharged and (iii) the right to require such person
to forthwith deliver such Engine subject to such transfer upon the occurrence
and continuation of a Subordinated Event of Default after the Lien of the Senior
Mortgage shall have been discharged. The Company shall remain primarily liable
hereunder for the performance of all of the terms of this Mortgage to the same
extent as if such lease or transfer had not occurred, and, except as otherwise
provided herein, the terms of any such lease shall not permit any Lessee to take
any action not permitted to be taken by the Company in this Mortgage with
respect to the Engines. No pooling arrangement, lease or other relinquishment of
possession of any Engine or Engine Documents shall in any way discharge or
diminish any of the Company's obligations to the Security Trustee hereunder or
constitute a waiver of the Security Trustee's rights or remedies hereunder.
Except as otherwise provided herein and without in any way relieving the Company
from its primary obligation for the performance of its obligations under this
Mortgage, the Company may in its sole discretion permit a Lessee to exercise any
or all rights which the Company would be entitled to exercise under Article III,
and may cause a Lessee to perform any or all of the Company's obligations under
Article III (provided that a Lessee may not lease or otherwise in any manner
deliver, transfer or relinquish possession of an Engine except as expressly
permitted by this Mortgage), and the Security Trustee agrees to accept actual
and full performance thereof by a Lessee in lieu of performance by the Company.
Any Wet Lease shall not constitute a delivery, transfer or relinquishment of
possession for purposes of Section 3.02(a) and shall not be prohibited by the
terms hereof. Any event that constitutes or would, with the passage of time,
constitute an Event of Loss under paragraph (c), (d) or (e) of the definition of
such term (as set forth in Appendix A) shall not be deemed to violate the
provisions of this Section 3.02.

<PAGE>

                                                                              11

            (b) Operation and Use. The Company shall not, and shall not allow
any other person to, operate, use, maintain, service, repair or overhaul the
Engines (i) in violation of any Law binding on or applicable to the Company or
to any Engine, or any of the Engine Documents, or to the operation, use,
maintenance, service, repair or overhaul of, or similar dealings in, any Engine,
or (ii) in violation of any airworthiness certificate, license or registration
of any Government Entity relating to the Company or to any Engine, except (1)
immaterial or non-recurring violations with respect to which corrective measures
are taken promptly by the Company or a Lessee, as the case may be, upon
discovery thereof, and (2) to the extent the Company or any Lessee is contesting
the validity or application of any such Law, rule, regulation, order,
certificate, license or registration in good faith in any reasonable manner
which does not involve any material risk of the sale, forfeiture or loss
(including loss of use) of any Engine or any of the Engine Documents 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 the
Mortgage. The Company agrees not to operate, use or locate any Engine, or allow
any Engine to be operated, used or located (A) in any area excluded from
coverage by any insurance required by the terms of Section 3.05, except in the
case of a requisition by the U.S. Government where the Company obtains an
indemnity in lieu of such insurance from the U.S. Government, or insurance from
the U.S. Government, covering such area, in accordance with Section 3.05(c) or
(B) in any recognized or threatened area of hostilities unless fully covered in
accordance with Appendix B by war-risk insurance as required by the terms of
Section 3.05 (including, without limitation, Section 3.05(c)), unless the Engine
is only temporarily located in such area as a result of an emergency, equipment
malfunction, navigational error, hijacking, weather condition or other similar
unforeseen circumstances, so long as the Company diligently and in good faith
proceeds to remove the Engine from such area immediately.

            (c) Maintenance. The Company, at its own cost and expense, shall (or
shall cause a Lessee to) maintain, service, repair and overhaul (or cause to be
maintained, serviced, repaired and overhauled) each Engine in accordance with
the requirements of an FAA or JAA approved maintenance program so as to keep
each Engine serviceable (except when undergoing overhaul) and in as good
operating condition as when initially subjected to the Lien hereof, ordinary
wear and tear excepted, and as may be necessary and required under applicable
Law, including the Federal Aviation Act, airworthiness directives, and other
applicable rules, regulations and requirements by any government authority,
utilizing, except during any period that a Lease is in effect, the same manner
and standard of maintenance, service, repair or overhaul used by the Company
with respect to engines similar to such Engine operated by the Company and
utilizing, during any period that a Lease is in effect, the same manner and
standard of maintenance, service, repair or overhaul used by the Lessee with
respect to engines similar to such Engine operated by the Lessee. The Company
further agrees that the Engines will be maintained, used, serviced, repaired,
overhauled or inspected in compliance with applicable Laws with respect to the
maintenance of the Engines and in compliance with each applicable airworthiness
certificate, license and registration of any Government Entity, including the
FAA, relating to any Engine, other than minor or nonrecurring violations with
respect to which corrective measures are taken upon discovery thereof and except
to the extent the Company or Lessee is contesting in good faith the validity or
application of any such Law or requirement relating to any such certificate,
license or registration in any reasonable manner which does not create a risk of
sale, loss or forfeiture of any Engine or the interest of the Security Trustee
therein, any material risk of civil liability or any risk of criminal liability.
If an Engine becomes

<PAGE>

                                                                              12

unserviceable, the Company shall commence the restoration process with respect
to such Engine in due course; provided, however, that the Company shall not be
responsible for any delays by a third-party maintenance provider unless such
delay is caused by a breach of an obligation of the Company to the third-party
maintenance provider. If an Engine is not installed on an airframe for a period
in excess of thirty consecutive days and is not undergoing maintenance during
such period, the Company (or a Lessee) shall store such Engine in accordance
with the requirements of the Company's (or, if applicable, a Lessee's) FAA or
JAA approved maintenance program. The Company agrees that an Engine may only be
serviced, overhauled and repaired in an FAA-approved maintenance facility. The
Company agrees that it will commence the restoration process with respect to any
Engine that is not in serviceable condition on a timely basis. The Company shall
maintain or cause to be maintained all Engine Documents in respect of each
Engine in accordance with the requirements of the Company's (or if such Engine
is subject to a Lease, Lessee's) FAA or JAA approved maintenance program.

            (d) Identification of Security Trustee's Interest. As promptly as
possible, and in any case within 180 days following the Closing Date, the
Company agrees to affix and maintain (or cause to be affixed and maintained), at
its expense, on each Engine a nameplate (which shall be provided to the Company
by the Security Trustee) bearing the inscription:

            "THIS ENGINE IS SUBJECT TO A MORTGAGE AND SECURITY AGREEMENT IN
            FAVOR OF WELLS FARGO BANK NORTHWEST, NATIONAL ASSOCIATION, AS
            SECURITY TRUSTEE"

(such nameplate to be replaced if there is a successor Security Trustee). Such
nameplate may be removed temporarily in the course of maintenance of an Engine.

            Section 3.03. Replacement and Pooling of Parts; Alterations,
Modifications and Additions.

            (a) Replacement of Parts. So long as an Engine is subject to the
Lien of this Mortgage, the Company, at its own cost and expense, will promptly
replace or cause to be replaced all Parts which may from time to time be
incorporated or installed in or attached to any Engine and which may from time
to time become worn out, lost, stolen, destroyed, seized, confiscated, damaged
beyond repair or permanently rendered unfit for use for any reason whatsoever,
except as otherwise provided in Section 3.03(d) hereof or if an Engine to which
a Part relates has suffered an Event of Loss. In addition, the Company (or any
Lessee) may, at its own cost and expense, remove in the ordinary course of
maintenance, service, repair, overhaul or testing, any Parts, whether or not
worn out, lost, stolen, destroyed, seized, confiscated, damaged beyond repair or
permanently rendered unfit for use; provided that the Company (or such Lessee),
except as otherwise provided in Section 3.03(d) hereof, will, at its own cost
and expense, replace such Parts as promptly as practicable. All replacement
Parts shall be free and clear of all Liens (except Permitted Liens, pooling
arrangements to the extent permitted by Section 3.03(c) and except in the case
of replacement property temporarily installed on an emergency basis) and shall
be in good operating condition, and shall have a value and utility (without
regard to hours and cycles) at least equal to, the Parts replaced (assuming such
replaced Parts were in the condition and repair required to be maintained by the
terms hereof); provided that each replacement Part shall have at least enough
remaining hours, cycles and calendar life

<PAGE>

                                                                              13

(as applicable) at the time of its installation on the relevant Engine to last
until the next expected maintenance event of such Engine. Notwithstanding
anything to the contrary set forth elsewhere in this Section 3.03(a), (x) no
removal and replacement of Parts pursuant to this Section 3.03(a) shall be
permitted for the purpose of diminishing the value, utility or remaining useful
life of any Engine, and (y) neither the Company nor any Lessee shall be
permitted to remove or replace any Parts pursuant to this Section 3.03(a) in any
manner, for any reason, or on any basis that would discriminate against the
interests of the Security Trustee in any Engine (as compared to other aircraft
engines of the same type owned, leased or operated by the Company or any Lessee,
as the case may be).

            (b) Parts Subject to Lien. Except as otherwise provided in Section
3.03(d) hereof, all Parts at any time removed from any Engine shall remain
subject to the Lien of this Mortgage, no matter where located, until such time
as such Parts shall be replaced by Parts that have been incorporated or
installed in or attached to such Engine and which meet the requirements for
replacement Parts specified in Section 3.03(a) hereof. Immediately upon any
replacement part becoming incorporated or installed in or attached to an Engine
as provided in Section 3.03(a) hereof, without further act (subject only to
Permitted Liens and except in the case of replacement property temporarily
installed on an emergency basis), (i) the replaced Part shall thereupon be free
and clear of the Lien of this Mortgage and all rights of the Security Trustee
and shall no longer be deemed a Part hereunder and (ii) the replacement part
shall be deemed a Part hereunder and such replacement Part shall become subject
to the Lien of this Mortgage and be deemed part of such Engine for all purposes
hereof to the same extent as the Parts originally incorporated or installed in
or attached to such Engine.

            (c) Pooling of Parts. Any Part removed from any Engine as provided
in Section 3.03(a) hereof may be subjected by the Company (or any Lessee) to a
normal pooling arrangement customary in the commercial airline industry of which
the Company (or any Lessee) is a party entered into in the ordinary course of
the Company's (or such Lessee's) business; provided that the Part replacing such
removed Part shall be incorporated or installed in or attached to such Engine in
accordance with Sections 3.03(a) and 3.03(b) hereof as promptly as practicable
after the removal of such removed Part. In addition, any replacement Part when
incorporated or installed in or attached to any Engine in accordance with
Section 3.03(a) hereof may be owned by any third party subject to such a normal
pooling arrangement; provided that the Company (or any Lessee), at its expense,
as promptly thereafter as practicable, either (i) causes such replacement Part
to become subject to the Lien of this Mortgage, free and clear of all Liens
except Permitted Liens, at which time such temporary replacement Part shall
become a Part or (ii) replaces such replacement Part by incorporating or
installing in or attaching to such Engine a further replacement Part which is
subject to the Lien of this Mortgage, free and clear of all Liens except
Permitted Liens.

            (d) Alterations; Modifications and Additions. The Company, at its
own expense, will make or cause to be made such alterations and modifications in
and additions to any Engine as may be required to be made from time to time to
meet the applicable standards of the FAA or JAA, to the extent made mandatory in
respect of the Engines; provided, however, that the Company in good faith and by
appropriate proceedings may contest the validity or application of any such
mandatory modification in any reasonable manner which does not involve any risk
of loss, sale or forfeiture of any Engine, or result in any risk of criminal
liability

<PAGE>

                                                                              14

or material civil liability to any Secured Party or materially adversely affect
the Security Trustee's interest in such Engine. In addition, the Company, at its
own expense, may, or may permit a Lessee at its own cost and expense to, from
time to time make or cause to be made such alterations and modifications in and
additions to any Engine (each an "Optional Modification") as the Company or such
Lessee may deem desirable in the proper conduct of its business including,
without limitation, removal of Parts which the Company deems are obsolete or no
longer suitable or appropriate for use in such Engine; provided, however, that
(i) no such Optional Modification shall materially diminish the value, utility,
or useful life of any Engine below its value, utility or useful life immediately
prior to such Optional Modification (assuming such Engine was in the condition
required by the Mortgage immediately prior to such Optional Modification) and
(ii) such Optional Modification shall have been approved by the applicable
Engine Manufacturer or the FAA or JAA, as applicable. Except as otherwise
expressly provided herein, all Parts incorporated or installed in or attached or
added to any Engine as the result of any such alteration, modification or
addition (the "Additional Parts") shall become subject to the Lien of this
Mortgage. Notwithstanding the foregoing sentence, the Company (or any Lessee)
may remove or suffer to be removed any Additional Part; provided that such
Additional Part (i) is in addition to, and not in replacement of or in
substitution for, any Part originally incorporated or installed in or attached
to such Engine on the date that the Company originally acquired such Engine or
any Part in replacement of, or in substitution for, any such Part, (ii) is not
required to be incorporated or installed in or attached or added to such Engine
pursuant to the terms of Section 3.02(c) hereof, the terms of the insurance
policies required to be carried hereunder or any applicable law or the first
sentence of this Section 3.03(d), and (iii) can be removed from such Engine
without materially diminishing the value, utility or remaining useful life which
such Engine would have had at the time of removal had such alteration,
modification or addition not occurred, assuming that such Engine was in the
condition and repair required to be maintained by the terms hereof. Upon the
removal by the Company (or any Lessee) of any such Part as above provided, such
Part shall, without further act, be free and clear of the Lien of this Mortgage
and all rights of the Security Trustee and such Part shall no longer be deemed a
Part hereunder.

            Section 3.04. Event of Loss and Release of Engines.

            (a) Event of Loss With Respect to an Engine. Upon the occurrence of
an Event of Loss with respect to an Engine, the Company shall promptly (and in
any event within ten (10) Business Days after such occurrence) give the Security
Trustee written notice of such Event of Loss. The Company shall, within thirty
(30) days after the occurrence of an Event of Loss with respect to an Engine
give the Security Trustee written notice of its election to perform one of the
following options (it being agreed that, if the Company shall not have given
notice of such election within such 30-day period, the Company shall be deemed
to have elected the option in clause (i) of the next sentence). The Company may
elect either to (i) repay a principal amount of the Loan in an amount equal to
the Stipulated Loss Value of such Engine (or Termination Value of such Engine,
if Section 3.04(h)(3)(ii) of the Senior Mortgage is applicable), plus accrued
interest thereon and any other amounts in accordance with Section 1.1(d) of the
Loan Agreement (or, if the Lien of the Senior Mortgage has been discharged, pay
to the Security Trustee, to be held by the Security Trustee as cash collateral
under this Mortgage, an amount equal to the Stipulated Loss Value of such
Engine, or Termination Value of such Engine if Section 3.04(i)(3)(ii) hereof is
applicable), on or prior to the

<PAGE>

                                                                              15

earlier of (A) the sixty-first (61st) day following the Event of Loss and (B)
the third Business Day following the receipt of insurance proceeds with respect
to such occurrence (but in any event not earlier than the date of the Company's
election under the preceding sentence of this Section to make payment under this
clause (i)), or (ii) cause to be subjected to the Lien of this Mortgage in
replacement thereof not later than the sixtieth (60th) day following the
occurrence of such Event of Loss, a Replacement Engine, owned by the Company and
free and clear of all Liens except Permitted Liens; provided that if the Company
does not perform its obligation to effect such replacement in accordance with
this Section 3.04(a) during the period of time provided herein, then the Company
shall be deemed to have elected to make the payment contemplated by clause (i)
of this sentence within the period of time specified therein. The Company shall
not be entitled to elect the replacement option pursuant to clause (ii) of the
preceding sentence if, at the time the Company gives notice pursuant to the
preceding sentence there shall have occurred and be continuing a Special Default
or an Event of Default. A Replacement Engine for an Engine suffering an Event of
Loss must meet each of the following conditions:

            (1) be of the same model as the Engine to be replaced thereby, or an
      improved model, manufactured by the same Engine Manufacturer;

            (2) have a value, utility and remaining useful life at least equal
      to and be in at least as good operating condition as, the Engine to be
      replaced thereby (assuming that such Engine was of the value and utility
      and in the condition and repair required by the terms hereof immediately
      prior to the occurrence of the Event of Loss); and

            (3) have been first placed in service after October 22, 1994, or, if
      different, meet whatever conditions or requirements as may be required in
      order for the Security Trustee to be entitled to the benefits of Section
      1110 of the Bankruptcy Code with respect to such Replacement Engine in the
      event of a case under Chapter 11 of the Bankruptcy Code in which the
      Company is a debtor; provided, however, that the requirement set forth in
      this subclause (3) shall not apply (A) with respect to the first Engine to
      suffer an Event of Loss, or (B) if, after giving effect to the replacement
      of the Engine suffering the Event of Loss by the Replacement Engine
      proposed by the Company, the ratio (both by number of Engines and by
      value) of Engines for which the Security Trustee is entitled to the
      benefits of Section 1110 of the Bankruptcy Code in the event of a case
      under Chapter 11 of the Bankruptcy Code in which the Company is a debtor
      to all Engines then subject to the Lien of this Mortgage is equal to or
      greater than the ratio of the Specified Engines to all Engines subject to
      the Lien of this Mortgage as of the Closing Date.

            (b) Effect of Replacement or Payment. Upon the Company having
provided a Replacement Engine as provided in Section 3.04(a) above, the Lien of
this Mortgage shall attach to such Replacement Engine as though no Event of Loss
had occurred. Upon the Company having provided a Replacement Engine or having
made a repayment of the Loan (or payment to the Security Trustee of cash
collateral) pursuant to Section 3.04(a), the Security Trustee shall, at the cost
and expense of the Company, release from the Lien of this Mortgage the Engine
subject to such Event of Loss, and all Engine Documents and Warranties relating
to such Engine, by executing and delivering to the Company such documents and
instruments as the Company may reasonably request to evidence such release and
shall assign without recourse or representation to

<PAGE>

                                                                              16

the Company all claims it may have against any other Person arising from the
Event of Loss and the Company shall receive all insurance proceeds and other
proceeds from any award in respect of condemnation, confiscation, seizure or
requisition, including all investment interest thereon, to the extent not
previously applied to the purchase price of the Replacement Engine as provided
in Sections 3.04(d)(i) and 3.05 hereof.

            (c) Conditions to Engine Replacement. The Company's right to make a
replacement under Section 3.04(a) hereof shall be subject to the fulfillment, at
the Company's cost and expense, of the following conditions precedent:

            (1) On the date that the Replacement Engine is made subject to the
      Lien of this Mortgage (the "Replacement Closing Date"), no Special Default
      or Event of Default shall have occurred and be continuing;

            (2) On the Replacement Closing Date, an executed counterpart of each
      of the following shall have been delivered to the Security Trustee, in
      each case in form and substance reasonably satisfactory to the Security
      Trustee:

                  (A) a Mortgage Supplement covering the Replacement Engine
            (which shall be filed for recordation pursuant to the Federal
            Aviation Act);

                  (B) such Uniform Commercial Code financing statements covering
            the Lien created by this Mortgage as deemed necessary by the
            Security Trustee to protect the security interests of the Security
            Trustee in the Replacement Engine;

                  (C) a certificate of a qualified aircraft engineer (who may be
            an employee of the Company) or, if the Lien of the Senior Mortgage
            shall have been discharged and the Security Trustee makes written
            request to the Company within five Business Days after the Company
            shall have furnished to the Security Trustee the information
            referred to in Section 3.04(c)(5)(C), an independent appraiser
            specified in such request (provided such appraiser is reasonably
            acceptable to the Company), whose fees and expenses shall be paid by
            the Security Trustee if the appraiser's report supports the
            certificate delivered by the Company's aircraft engineer pursuant to
            this Section 3.04(c)(2)(C) and paid by the Company in all other
            circumstances, certifying that such Replacement Engine meets all of
            the requirements set forth in subclauses (1), (2) and (3) of
            Section 3.04(a), as applicable; and

                  (D) a copy of a bill of sale, manufacturer's invoice or other
            evidence of the Company's title with respect to the Replacement
            Engine.

            (3) The Security Trustee shall have received evidence satisfactory
      to the Security Trustee as to the due compliance with Section 3.05 hereof
      with respect to the Replacement Engine;

            (4) On the Replacement Closing Date, the Company shall be the owner
      of the Replacement Engine and shall cause the Replacement Engine to be
      subjected to the Lien of this Mortgage, free and clear of Liens (other
      than Permitted Liens);

<PAGE>

                                                                              17

            (5) The Security Trustee shall, at the expense of the Company, have
      received (A) an opinion addressed to the Security Trustee, reasonably
      satisfactory to the Security Trustee, to the effect that (i) the
      Replacement Engine has been made subject to the Lien of this Mortgage,
      (ii) the Security Trustee will be entitled to the benefits of Section 1110
      of the Bankruptcy Code (or any successor or replacement statute) with
      respect to the Replacement Engine to the extent that the benefits of
      Section 1110 of the Bankruptcy Code (or any successor or replacement
      statute) are required to be available to the Security Trustee with respect
      to such Replacement Engine in accordance with Section 3.04(a)(3) and (iii)
      to such further effect as the Security Trustee may reasonably request
      (including, if the Replacement Engine will be subject to a Lease to a
      Permitted Air Carrier which is not a U.S. Air Carrier upon effectiveness
      of such replacement, to the effect provided in clause (iii) of Section
      3.02(a)(viii)(E)), (B) an opinion of FAA counsel addressed to the Security
      Trustee, reasonably satisfactory to the Security Trustee, respecting the
      due filing for recordation with the FAA of the Mortgage Supplement with
      respect to such Replacement Engine, the perfection and priority of the
      Lien of this Mortgage thereon and as to such other matters concerning the
      Federal Aviation Act as the Security Trustee may reasonably request and
      (C) at least six Business Days before the Replacement Closing Date the
      information specified in Section 6.11 of the Indemnity Agreement with
      respect to the Replacement Engine as of a date within 30 days prior to the
      date such information is furnished to the Security Trustee; and

            (6) The Company shall have taken such other actions and furnished
      such other certificates and documents as the Security Trustee shall have
      reasonably requested in order that such Replacement Engine be duly and
      properly subjected to the Lien of this Mortgage to the same extent as
      initially required under the Operative Documents with respect to the
      Engine so replaced.

            (d) Payments Received on Account of an Event of Loss. If the Lien of
the Senior Mortgage shall not have been discharged, any payments on account of
an Event of Loss (other than insurance proceeds or other payments the
application of which is provided for in Section 3.05 hereof, or elsewhere in
this Mortgage, as the case may be, or payments in respect of damage to the
business or property of the Company) with respect to an Engine shall be held and
applied as provided in the Senior Mortgage and, after the Senior Mortgage shall
have been discharged, as between the Security Trustee and the Company, any such
payments (other than as aforesaid) received at any time by the Security Trustee
or by the Company from any Government Entity or other Person will be applied as
follows:

            (i) if such payments are received with respect to an Event of Loss
      as to an Engine and such Engine is being replaced by the Company pursuant
      to Section 3.04(a) hereof, such payments shall be paid over to, or
      retained by, the Security Trustee as security; and upon completion of such
      replacement (or upon the closing therefor) and compliance with the
      provisions of Section 3.04(a) and (c) with respect to the Event of Loss
      for which such payments are made, all such payments, including all
      investment earnings thereon shall be promptly paid over to, or retained
      by, the Company; and

<PAGE>

                                                                              18

            (ii) if the Company has elected or is deemed to have elected to make
      the payment referred to in clause (i) of the third sentence of Section
      3.04(a), such payments shall be applied as follows:

            first, if the sum described in such clause (i) has not then been
      paid in full by the Company, such payments shall be deposited with the
      Security Trustee as cash collateral up to the amount required to be paid
      under such clause (i); and

            second, the balance, if any, shall be paid to, or retained by, the
      Company.

            (e) Requisition of Use. After the Lien of the Senior Mortgage shall
have been discharged, in the event of a requisition for use by a Government
Entity of such Engine not constituting an Event of Loss, any payments received
by the Security Trustee or the Company (or any Lessee of the applicable Engine)
from such government with respect to such requisition shall be retained by or
paid to the Company (or such Lessee, as the case may be).

            (f) 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 3.04 or Section 3.05 which is payable to or
retainable by the Company (or any Lessee) shall not be paid to or retained by
the Company (or such Lessee), 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. 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 (or
such Lessee) to the extent not previously applied in accordance with the
preceding sentence.

            (g) Engine Exchange. Upon not less than ten (10) Business Days'
prior written notice from the Company to the Security Trustee, provided no
Special Default or Event of Default shall have occurred and be continuing, and
subject to compliance with Section 3.04(i) hereof if the final sentence of such
Section is then applicable, the Security Trustee shall release from the Lien of
this Mortgage pursuant to Section 3.04(b) one or more Engines specified in such
notice (herein, the "Released Engine") upon the replacement of such Engines with
other engines (the "Exchanged Engines") meeting the requirements of Section
3.04(a). Any such Exchanged Engine shall be deemed to be a "Replacement Engine"
and the Security Trustee and the Company shall comply with the provisions of
Section 3.04 with regard to the Exchanged Engine and the Released Engine,
provided that if the Security Trustee requests a certificate of an independent
appraiser pursuant to Section 3.04(c)(2)(C), then, notwithstanding anything to
the contrary in Section 3.04(c)(2)(C), the fees and expenses of such appraiser
shall be paid by the Security Trustee if the Security Trustee does not have a
reasonable basis for requesting such appraisal and the appraisal supports the
report of the Company's aircraft engineer, and such fees and expenses shall be
paid by the Company in all other circumstances.

            (h) Release of Cash Collateral. If the Company shall have paid to
the Security Trustee funds to be held as cash collateral pursuant to Section
3.04(a) due to the occurrence of an Event of Loss with respect to an Engine,
upon (i) not less than five (5) Business Days' prior

<PAGE>

                                                                              19

written notice from the Company to the Security Trustee and (ii) the Company
causing a Replacement Engine for such Engine meeting the requirements of Section
3.04(a) to be subject to the Lien of this Mortgage in accordance with the
provisions of Section 3.04(c) hereof, the Security Agent shall release to the
Company by wire transfer of immediately available funds the amount of such cash
collateral, plus any net earnings thereon pursuant to Section 6.01, then subject
to Lien of this Mortgage.

            (i) Permitted Dispositions. Upon not less than ten (10) Business
Days' prior written notice from the Company to the Security Trustee, provided no
Special Default or Event of Default shall have occurred and be continuing, the
Security Trustee shall release from the Lien of this Mortgage pursuant to
Section 3.04(b) one or more Engines specified in such notice (the "Disposed
Engines") that the Company is disposing, or intends to dispose, in the ordinary
course of its business (a "Permitted Disposition") (treating such Disposed
Engines, for the purposes of Section 3.04(b) as Engines having suffered an Event
of Loss) if, but only if, each of the following conditions is satisfied:

            (1) the Company delivers to the Security Trustee an Officer's
      Certificate certifying that (i) each of the Disposed Engines is surplus to
      the operational needs of the Company and is not required to meet the fleet
      planning needs of the Company in the ordinary course of its business, and
      (ii) the Company has not, and does not intend to, acquire by any means
      whatsoever any replacement for any of the Disposed Engines as support for
      the Company's operations (it being expressly understood that any purchase,
      lease or sublease of one or more other engines and any other arrangement
      permitting the Company access to or use of one or more other engines would
      all be considered a replacement of the Disposed Engines within the meaning
      of this Section 3.04(i)(1)(ii));

            (2) except with respect to the first Disposed Engine to be disposed
      of by the Company and released from the Lien of this Mortgage pursuant to
      this Section 3.04(i) during the term of this Mortgage (for which it is
      agreed that the condition set forth in this subclause (2) shall not
      apply), after giving effect to the disposal of the Disposed Engines, the
      ratio (both by number of Engines and by value) of remaining Engines for
      which the Security Trustee is entitled to the benefits of Section 1110 of
      the Bankruptcy Code in the event of a case under Chapter 11 of the
      Bankruptcy Code in which the Company is a debtor to all Engines then
      remaining subject to the Lien of this Mortgage is equal to or greater than
      the ratio of the Specified Engines to all Engines subject to the Lien of
      this Mortgage as of the Closing Date; and

            (3) the Company shall have paid, in immediately available funds, in
      accordance with clause (i) of the third sentence of Section 3.04(a), a
      prepayment of the principal amount of the Loan (plus accrued interest
      thereon and any other amounts payable therewith in accordance with Section
      1.1(d) of the Loan Agreement) if the Lien of the Senior Mortgage is then
      in effect, and a payment to the Security Trustee if the Lien of the Senior
      Mortgage has been discharged, in an amount equal to (i) with respect to
      any such disposition occurring on or after the Designated Date, and any
      such disposition of up to four Disposed Engines at any time prior to the
      Designated Date (provided that if all such Disposed Engines are
      manufactured by CFM International, Inc., up to five Disposed Engines prior
      to the Designated Date), the Stipulated Loss Value of the Disposed Engine,

<PAGE>

                                                                              20

      and (ii) with respect to any such disposition of a Disposed Engine as to
      which the preceding clause (i) does not apply, the Termination Value of
      the Disposed Engine.

            (j) Additional Collateral. If (i) the Company exercises its right to
make one or more Exchanged Engines subject to the Lien of this Mortgage, (ii)
any such Exchanged Engine has fewer hours or cycles or less calendar time
remaining to next expected major overhaul than the corresponding Released Engine
(any such Exchanged Engine being referred to herein as a "Short Time Engine")
and (iii) at any time thereafter two consecutive quarterly engine reports
(prepared in accordance with Section 6.11 of the Indemnity Agreement) indicate
that all of the Engines subject to the Lien of this Mortgage have on average
less than 4,393 hours or less than 2,899 cycles remaining until the next
expected major overhaul, then the Company shall, within five (5) Business Days
following the due date of the second such quarterly engine report, comply with
all of the following requirements:

            (1) With respect to all such Short Time Engines, the Company shall
      furnish the Senior Trustee, if the Lien of the Senior Mortgage is then in
      effect, and the Security Trustee if the Lien of the Senior Mortgage is not
      then in effect, with a certificate of an independent appraiser selected by
      the Senior Trustee, if the Lien of the Senior Mortgage is then in effect,
      and the Security Trustee if the Lien of the Senior Mortgage is not then in
      effect, and reasonably satisfactory to Company certifying as to difference
      in value, if any, set forth in dollars, based on the difference in hours,
      cycles and calendar time since last shop visit, or since new, as
      applicable, as of the date of such exchange, between each such Short Time
      Engine and the corresponding Released Engine (the cumulative aggregate
      amount of any and each such deficiency in value between a Short Time
      Engine and the corresponding Released Engine being referred to herein as
      the "Exchange Shortfall Amount"); and

            (2) If the independent appraiser's report prepared pursuant to
      Section 3.04(j)(1) hereof sets forth an Exchange Shortfall Amount, the
      Company shall provide the Senior Trustee, if the Lien of the Senior
      Mortgage is then in effect, and the Security Trustee if the Lien of the
      Senior Mortgage is not then in effect, with a letter of credit that is in
      an amount equal to the Exchange Shortfall Amount and that otherwise meets
      all of the following requirements (each such letter of credit, a "Letter
      of Credit"):

                  (i) Such Letter of Credit must be issued and payable by a
            Pre-Approved Bank or another bank acceptable to the Senior Trustee,
            if the Lien of the Senior Mortgage is then in effect, and the
            Security Trustee if the Lien of the Senior Mortgage is not then in
            effect, in its sole and absolute discretion and in substantially the
            form of Exhibit B or in another form and substance acceptable to the
            Senior Trustee, if the Lien of the Senior Mortgage is then in
            effect, and the Security Trustee if the Lien of the Senior Mortgage
            is not then in effect, in its sole and absolute discretion, and, if
            not issued by a Pre-Approved Bank or the New York branch of a major
            international bank acceptable to the Senior Trustee, if the Lien of
            the Senior Mortgage is then in effect, and the Security Trustee if
            the Lien of the Senior Mortgage is not then in effect, in its sole
            and absolute discretion from time to time, will be confirmed by and
            payable at a Pre-Approved Bank or the New York branch of a major
            international bank acceptable to the Senior

<PAGE>

                                                                              21

            Trustee, if the Lien of the Senior Mortgage is then in effect, and
            the Security Trustee if the Lien of the Senior Mortgage is not then
            in effect, in its sole and absolute discretion from time to time,
            and shall remain in full force and effect and may be drawn down by
            the Senior Trustee, if the Lien of the Senior Mortgage is then in
            effect, and the Security Trustee if the Lien of the Senior Mortgage
            is not then in effect, upon demand at any time or times following
            the occurrence of an Event of Default until the Required LC Expiry
            Date.

                  (ii) Such Letter of Credit may have a validity period or
            periods ending prior to the Required LC Expiry Date, provided that
            (i) the Letter of Credit shall, in each case, be renewed, extended
            or reissued and delivered to the Security Trustee not later than
            sixty (60) days prior to its expiry; and (ii) a Letter of Credit
            shall remain in force at all times up to the Required LC Expiry
            Date.

                  (iii) If at any time while the Lien of this Mortgage remains
            in effect, and after the Lien of the Senior Mortgage shall have been
            discharged, the Security Trustee determines in its sole and absolute
            discretion that the current issuing or confirming bank for the
            Letter of Credit is no longer an acceptable issuing or confirming
            bank (whether by virtue of a material adverse change in its
            financial condition, a decrease in any credit rating of its
            long-term unsecured debt obligations or for any other reason) the
            Security Trustee shall notify the Company of such fact and the
            Company shall within five (5) Business Days after the date of such
            notice cause the Letter of Credit to be replaced by a Letter of
            Credit issued by a Pre-Approved Bank or another bank acceptable to
            the Security Trustee in its sole and absolute.

Provided that no Special Default or Event of Default shall have occurred and is
continuing, the Security Trustee shall release and return to the Company each
such Letter of Credit held by the Security Trustee at such time as the Short
Time Engine to which such Letter of Credit relates has completed a major
overhaul. The proceeds of any drawing upon a Letter of Credit by the Security
Trustee for any reason other than the occurrence of an Event of Default shall be
held by the Security Trustee as cash collateral in accordance with Section 6.01
hereof. If the Company proposes to exercise its right to provide a Short Time
Engine hereunder at any time when a Letter of Credit is in place with respect to
a prior exercise of such right, the Company shall provide the report described
in clause (1) above with respect to the proposed exchange and, if such report
shows a further Exchange Shortfall Amount, the Company shall comply with clause
(2) above as a condition to making such exchange.

            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

<PAGE>

                                                                              22

      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. All proceeds of
      insurance required to be maintained by the Company, in accordance with
      Section 3.05 and Section B of Appendix B, in respect of any property
      damage or loss, whether or not constituting an Event of Loss, shall be
      adjusted, paid and applied in the manner specified in Section B of
      Appendix B.

            Section 3.06. Filings. The Company will take, or cause to be taken,
at the Company's cost and expense, such action with respect to the recording,
filing, re-recording and re-filing of this Mortgage, each Mortgage Supplement
and any financing statements or other instruments as are necessary, or
reasonably requested by the Security Trustee and appropriate, to maintain, so
long as this Mortgage is in effect, the perfection and priority of the Lien
created by this Mortgage, or will furnish to the Security Trustee timely notice
of the necessity of such action, together with such instruments, in execution
form, and such other information as may be required to enable the Security
Trustee to take such action. 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.
The Company will notify the Security Trustee of any change in its jurisdiction
of organization (as such term is used in Article 9 of the Uniform Commercial
Code as in effect in the State of Delaware) promptly after making such change or
in any event within the period of time necessary under applicable law to prevent
the lapse of perfection (absent refiling) of financing statements filed under
the Operative Documents.

            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;

<PAGE>

                                                                              23

            (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;

            (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 each Engine 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 has occurred and is
continuing, no more frequently than once in any 12-month period), the Security
Trustee and its authorized representatives (the "Inspecting Parties") may
inspect the Engines (including without limitation, the Engine Documents) and the
Company shall cooperate, and shall cause any Lessee to cooperate, with the

<PAGE>

                                                                              24

Inspecting Parties in connection with any such inspection (including, without
limitation, permitting any such Inspecting Party to make copies of Engine
Documents not reasonably deemed confidential by the Company or such Lessee) at
its own cost and expense.

            (b) Any inspection of the Engines hereunder shall be limited to a
visual inspection, shall be in compliance with the Company's work and safety
rules and shall not include the disassembling, or opening of any components, of
any Engine, and no such inspection shall interfere with the Company's or any
Lessee's maintenance or use of any Engine.

            (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 has occurred and is continuing, so
      as not to unreasonably interfere with the Company's or any Lessee's
      maintenance and operation of the Aircraft and Engines.

            (d) Each person inspecting the Engines 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.

            (e) After the Lien of the Senior Mortgage shall have been
discharged, if requested by the Security Trustee, the Company shall provide, or
shall cause any Lessee to provide, to the Security Trustee the date(s), if then
scheduled, upon which any Engine undergoes its next scheduled maintenance visit
and next major check and next off-the-wing maintenance, and shall advise the
Security Trustee of the name and location of the relevant maintenance performer,
if then selected, and shall, if requested by the Security Trustee in connection
with a major check, at least 5 days prior to commencement of such major check or
maintenance, make available for inspection by the Security Trustee all relevant
Engine Documents at the Company's records facility in the United States, or at
such Lessee's records facility, or at the premises of the maintenance performer.

                                   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; provided,
however, that during any period an Engine is subject to the Civil Reserve Air
Fleet Program in accordance with the provisions of Section

<PAGE>

                                                                              25

3.02(a) hereof and in possession of the U.S. Government, the Security Trustee
shall not, on account of any Subordinated Event of Default, be entitled to
exercise any of the following remedies in such manner as to limit the Company's
control under this Mortgage of such Engine, unless at least sixty (60) days' (or
such other period as may then be applicable under the Civil Reserve Air Fleet
Program) written notice of such Subordinated Event of Default hereunder shall
have been given by the Security Trustee by registered or certified mail to the
Company (and any Lessee) with a copy addressed to the Contracting Office
Representative for the Air Mobility Command of the United States Air Force under
any contract with the Company (or by Lessee) relating to such Engine:

            (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 Engines constituting the
      Collateral at such location designated by the Security Trustee within the
      continental United States of America, together in each case with the
      Engine Documents for such Engine(s) as the Security Trustee may so demand,
      to the Security Trustee or its order, or the Security Trustee, at its
      option, may peaceably enter upon the premises where all or any of such
      Engine(s) and/or Engine 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;

            (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;

            (iii) draw upon any Letters of Credit then held and apply such
      amounts as provided in Section 4.04 hereof; or

            (iv) 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

<PAGE>

                                                                              26

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
Subordinated 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 Engine 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 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.

            The Company agrees that if a Subordinated Event of Default has
occurred and is continuing, and only for so long as the Security Trustee is
exercising its foreclosure rights with respect to the Engines and requires use
of an engine stand owned by the Company for transporting an Engine, the Company
shall permit the Security Trustee or its agents or representatives to use such
an engine stand suitable for use with such Engine, available at the location of
such Engine and which is not otherwise being used by the Company, for the sole
purpose of transporting such Engine. The Security Trustee shall return each such
engine stand to the location from which it was taken promptly after it has
transported such Engine using such engine stand. The Security Trustee further
agrees to return each such engine stand to the Company in as good condition as
when furnished to the Security Trustee (or its agents or representatives),
ordinary wear and tear excepted, and the Security Trustee acknowledges that it
has no security interest in any such engine stand. The costs of the Security
Trustee in transporting an engine stand and restoring the condition of an engine
stand pursuant to this

<PAGE>

                                                                              27

paragraph shall be an expense of the Beneficiaries, and the Company shall have
no obligation to reimburse such expense (directly or from the proceeds of the
sale of any Collateral).

            The Company agrees that if an Event of Default has occurred and is
continuing and only for so long as the Security Trustee is exercising its
foreclosure rights with respect to the Engines and requires use of the Company's
engine stands for transporting such Engines, the Company shall provide the
Security Trustee or its agents or representatives with full and complete access
to the use of the engine stands owned by the Company on which any Engines are
then installed or those which are not otherwise being utilized at the time of
such foreclosure. The Security Trustee agrees to return each such engine stand
used by it promptly after it has transported an Engine using such engine stand
and acknowledges that it has no security interest in any such engine stand.

            (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 Engine 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 Engines,
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

<PAGE>

                                                                              28

otherwise, and such proceedings shall have been discontinued or abandoned for
any reason, then 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; and

            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

<PAGE>

                                                                              29

hold in trust for the benefit of the "Secured Parties" (as defined in the Senior
Mortgage) and shall 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 Sections 3.04(d),
3.04(f) and 3.05(d) 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).

                                   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 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

<PAGE>

                                                                              30

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 Engines 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 an Engine from the Lien of this Mortgage in accordance with the
terms of this Mortgage, the Parts, Engine Documents and other Collateral
referred to in subsections (b), (c), (d) and (e) of Section 2.01 relating to
such Engine 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 Engines 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
entitles the Security Trustee on behalf of the Beneficiaries to all of the
benefits of Section 1110 of Chapter 11 of the Bankruptcy Code in respect of the
Specified Engines in the event the Company becomes a debtor under such Chapter.

<PAGE>

                                                                              31

            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.

<PAGE>

                                                                              32

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

<PAGE>

                                                                              33

            Section 7.14. Governing Law. 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.

                       [Remainder of this page is blank.]

<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.

<PAGE>

                                                                      APPENDIX A
                                                                               2

(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

            "Additional Parts" has the meaning specified in Section 3.03(d) of
the Mortgage.

            "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.

            "Aggregate Disposition Proceeds" has the meaning given to that term
in the Indemnity Agreement.

            "Aircraft" means an airframe on which an Engine is then installed.

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

            "Bankruptcy Code" means Title 11 of the United States Code.


            "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.

<PAGE>

                                                                      APPENDIX A
                                                                               3

            "Civil Reserve Air Fleet Program" means the Civil Reserve Air Fleet
Program, currently administered by the United States Air Force Military Command
pursuant to Executive Order No. 11490, as amended, or any substantially similar
program.

            "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.

            "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.

            "Disposed Engine" has the meaning set forth in Section 3.04(i).

            "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 (a) each of the engines listed in Annex A to each
Mortgage Supplement executed and delivered by the Company pursuant to the Loan
Agreement and (b) any and all Parts. Upon substitution of a Replacement Engine
or an Exchanged Engine in accordance with Section 3.04 of this Mortgage, any
such Replacement Engine or Exchanged Engine shall become subject to the Mortgage
and shall be an "Engine" for all purposes of this Mortgage and the Loan
Agreement. Upon substitution of a Replacement Engine or an Exchanged Engine in
accordance with Section 3.04 of the Mortgage, the Engine released

<PAGE>

                                                                      APPENDIX A
                                                                               4

pursuant to such Section shall no longer be subject to the Mortgage, and such
released Engine shall cease to be an "Engine." Each Engine shall be bare and
shall not include parts associated with any Aircraft.

            "Engine Documents" means all technical data, manuals and log books,
and all inspection, modification and overhaul records and other service, repair,
maintenance and technical records that are required by the Company's (or, in the
case of any Engine subject to a Lease, such Lessee's) maintenance program in
accordance with the requirements of the FAA or the JAA, as the case may be, to
be maintained with respect to the Engines or Parts, and such term shall include
all additions, renewals, revisions and replacements of any such materials from
time to time made, or required to be made, in accordance with FAA or JAA, as the
case may be, regulations, and in each case in whatever form and by whatever
means or medium (including, without limitation, microfiche, microfilm, paper or
computer disk) such materials may be maintained or retained by or on behalf of
the Company (provided, that all such materials shall be maintained in the
English language).

            "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.

            "Event of Loss" means, with respect to any Engine, any of the
following circumstances, conditions or events with respect to such Engine, for
any reason whatsoever:

                  (a) the destruction of such Engine, damage to such Engine
      beyond practical or economic repair or rendition of such Engine
      permanently unfit for normal use by the Company;

                  (b) the actual or constructive total loss of such Engine or
      any damage to such Engine, or requisition of title or use of such Engine,
      which results in an insurance settlement with respect to such Engine on
      the basis of a total loss or constructive or compromised total loss;

                  (c) any theft, hijacking or disappearance of such Engine for a
      period of 180 consecutive days or more;

                  (d) any seizure, condemnation, confiscation, or taking of, or
      requisition of title to, such Engine by any Government Entity or purported
      Government Entity (other than a requisition of use by the U.S. Government)
      for a period exceeding 180 consecutive days;

                  (e) any seizure, condemnation, confiscation, taking or
      requisition of use of such Engine that continues until the earliest of (i)
      the date upon which such Engine is modified, altered or adapted in such a
      manner as would render conversion of such Engine for use in normal
      commercial passenger service impractical or uneconomical, (ii) the date on
      which such Engine is operated or located in any area excluded from
      coverage by any insurance policy required to be maintained in respect of
      such Engine pursuant to the Mortgage (unless an indemnity in lieu of
      insurance is provided to the Security Trustee in accordance with Section
      3.05(c) of the Mortgage) or (iii) the date that is 180 days

<PAGE>

                                                                      APPENDIX A
                                                                               5

      following the commencement of such loss of use (unless such loss of use
      results from action by the U.S. Government, in which case this clause
      (iii) shall not apply to such loss of use); and

                  (f) as a result of any Law, rule, regulation, order or other
      action by the FAA, the use of such Engine in the normal course of the
      Company's (or any Lessee's) business of passenger air transportation is
      prohibited for a period expiring on the date that is 180 days following
      commencement of such prohibition, provided that if the Company (or such
      Lessee) prior to the expiration of such 180-day period, shall have
      undertaken and shall be diligently carrying forward all steps which are
      necessary or desirable to permit the normal use of such Engine by the
      Company, then the date that is 18 months following commencement of such
      prohibition; provided that no Event of Loss shall be deemed to have
      occurred if such prohibition has been applicable to the Company's (or such
      Lessee's) entire U.S. fleet of such property and the Company (or such
      Lessee), prior to the expiration of such 18-month period, shall have
      conformed at least one unit of such property in its fleet to the
      requirements of any such law, rule, regulation, order or other action and
      commenced regular commercial use of the same in such jurisdiction and
      shall be diligently carrying forward, in a manner which does not
      discriminate against such property in so conforming such property, steps
      which are necessary or desirable to permit the normal use of such Engine
      by the Company (or such Lessee), but in any event if such use shall have
      been prohibited for a period of three years.

The date of such Event of Loss shall be the date of such loss, damage, insurance
settlement, seizure, condemnation, confiscation, taking or requisition of title
or use or prohibition, except that, for purposes of clauses (c), (d), (e) and
(f) above, no Event of Loss shall be deemed to have occurred until the date of
expiration of the applicable period referred to therein.

            "Exchange Shortfall Amount" has the meaning set forth in Section
3.04(j).

            "Exchanged Engine" has the meaning set forth in Section 3.04(g).

            "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

<PAGE>

                                                                      APPENDIX A
                                                                               6

to the observance or performance of the obligations of any of the parties to the
Operative Documents.

            "Indemnity Agreement" means the Payment and Indemnity Agreement
[Engines], 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.

            "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.

            "Lease" means any lease permitted by the terms of Section
3.02(a)(vii) or (viii) of the Mortgage.

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

            "Lessee" means any lessee permitted by the terms of Section
3.02(a)(vii) or (viii) of the Mortgage.

            "Letter of Credit" has the meaning set forth in Section 3.04(j).

            "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 [Engines], 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.

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

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

            "Mortgage Supplement" means any supplement to the Mortgage from time
to time executed and delivered.

<PAGE>

                                                                      APPENDIX A
                                                                               7

            "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.

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

            "Parts" means any and all appliances, parts, instruments,
appurtenances, modules, accessories, and other equipment of whatever nature
which may from time to time be incorporated or installed in or attached to any
Engine or removed therefrom unless the Lien of the Mortgage shall not be
applicable to such Parts in accordance with Section 3.03 of the Mortgage.

            "Permitted Air Carrier" means any U.S. Air Carrier or any air
carrier with its principal executive offices in a country listed on Schedule I
to the Mortgage and which is authorized to conduct commercial airline operations
and to operate jet aircraft under the applicable Laws of such country.

            "Permitted Disposition" has the meaning set forth in Section
3.04(i).

            "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


<PAGE>

                                                                      APPENDIX A
                                                                               8

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.

            "Pre-Approved Bank" means any bank organized under the laws of the
United States or any State thereof, or the New York branch of a major
international bank, in each case for only so long as its long-term Dollar
denominated unsecured debt (or if it does not have long-term unsecured Dollar
denominated debt, its parent corporation's long-term unsecured Dollar
denominated debt) carries a rating from Standard & Poor's of A or better.

            "Released Engine" has the meaning set forth in Section 3.04(g).

            "Replacement Closing Date" has the meaning given such term in
Section 3.04(c) of the Mortgage.

            "Replacement Engine" means an engine substituted for an Engine
pursuant to Section 3.04 of the Mortgage.

            "Required LC Expiry Date" means the day that is the ninety-first
(91st) day following the scheduled Maturity Date (without giving effect to any
acceleration or prepayment) of the Notes issued pursuant to the Loan Agreement.

            "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.

            "Senior Mortgage" means the Engine 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.

            "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.

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

<PAGE>

                                                                      APPENDIX A
                                                                               9

            "Stipulated Loss Value" means, in the case of each Engine, (i) the
"Stipulated Loss Value-A" for such Engine (or the Engine that such Engine
replaced) on Schedule 2 to the Loan Agreement, with respect to an Event of Loss
that occurs prior to the Designated Date, and (ii) the "Stipulated Loss Value-B"
for such Engine (or the Engine that such Engine replaced) on Schedule 2 to the
Loan Agreement, with respect to an Event of Loss that occurs on or after the
Designated Date.

            "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 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

<PAGE>

                                                                      APPENDIX A
                                                                              10

      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

            (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 Engines under the laws of the United States of
      America and assuming that the Engines are located in the United States of
      America (and, if any Engine is subject to a Lease to a Lessee domiciled in
      any other jurisdiction, such jurisdiction, assuming that such Engine is
      located in such jurisdiction).

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

            "Termination Value" means, in the case of each Engine, the
"Termination Value" for such Engine (or the Engine that such Engine replaced) on
Schedule 2 to the Loan Agreement.

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

<PAGE>

                                                                      APPENDIX A
                                                                              11

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

            "U.S. Air Carrier" means any Certificated Air Carrier as to which
there is in force an air carrier operating certificate issued pursuant to Part
121 of the regulations under the Federal Aviation Act, or which may operate as
an air carrier by certification or otherwise under any successor or substitute
provisions therefor or in the absence thereof.

            "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.

            "Wet Lease" means any arrangement whereby the Company or a Lessee
agrees to furnish an Aircraft to a third party pursuant to which such Aircraft
(including any Engines attached thereto) shall at
all times be in the operational control of, and insured by, the Company or such
Lessee, provided that the Company's obligations under the Mortgage shall
continue in full force and effect notwithstanding any such arrangement.

<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.    BODILY INJURY LIABILITY AND PROPERTY DAMAGE LIABILITY INSURANCE.

            1. Except as provided in paragraph 2 of this Section A, and subject
to the self insurance to the extent permitted by Section D hereof, the Company
will at all times carry and maintain or cause to be carried and maintained, at
no expense to the Security Trustee, on a non-discriminatory basis, comprehensive
airline liability insurance, including passenger legal liability, bodily injury
liability, products liability, property damage liability and contractual
liability (exclusive of manufacturer's product liability insurance) with respect
to the Aircraft and the Engines (a) in an amount per occurrence not less than
the greater of (x) the amount of comprehensive airline legal liability insurance
from time to time applicable to aircraft owned or leased and operated by the
Company of the same type and operating on similar routes as the Aircraft and (y)
the Minimum Liability Amount, (b) of the type and covering the same risks as
from time to time applicable to aircraft operated by the Company (or any lessee
to whom such Engine is leased under and in accordance with Section 3.02(viii)
hereof, a "Permitted Lessee") of the same type which comprise the Company's (or
such Permitted Lessee's) fleet and (c) which is maintained in effect with
insurers or reinsurers of recognized responsibility. The Company shall maintain
cargo liability insurance in an amount not less than the amount of cargo
liability insurance maintained for other aircraft operated by the Company. Such
insurance shall in any event include cover for war risks and allied perils
liability insurance in accordance with London form AVN52D as in effect on
September 1, 2004 or its substantive equivalent, or in the case that such
coverage is maintained through the FAA, Chapter 443 of Title 49 of the United
States Code as in effect on September 1, 2004 and such war risks and allied
perils liability insurance shall be for an amount not less than the greater of
(i) the Minimum Liability Amount and (ii) the amount carried by the Company in
respect of similar aircraft owned or otherwise operated by the Company.

            2. During any period that the Aircraft or an Engine is on the ground
and not in operation, the Company may carry or cause to be carried, in lieu of
the insurance required by paragraph 1 above, and subject to the self-insurance
to the extent permitted by Section D hereof, insurance otherwise conforming to
the provisions of said paragraph 1 except that (a) the amounts of coverage shall
not be required to exceed the amounts of bodily injury liability and property
damage liability insurance from time to time applicable, in the case of the
Aircraft, to aircraft owned or leased by the Company (or any Permitted Lessee)
of the same or similar type as the Aircraft which comprise the Company's (or
such Permitted Lessee's) fleet, or, in the case of an Engine, to engines owned
or operated by the Company (or such Permitted Lessee) of the same type as such
Engine, and in any such case which are on the ground and not in operation and
(b) the scope of the risks covered and the type of insurance shall be consistent
with industry practice for airlines operating only similarly-sized equipment on
similar routes and the same as from time to time shall be applicable, in case of
Aircraft, to aircraft owned or leased by the Company (or any Permitted Lessee)
of the same or similar type which comprise the Company's (or such Permitted
Lessee's) fleet, or in the case of an Engine, to engines owned or operated by

<PAGE>

                                                                      APPENDIX B
                                                                              2

the Company (or such Permitted Lessee) of the same type as such Engine, and in
any case which are on the ground and not in operation.

      B.    INSURANCE AGAINST LOSS OR DAMAGE TO THE AIRCRAFT OR THE ENGINES.

            1. Except as provided in paragraph 2 of this Section B, and subject
to the provisions of Section D hereof permitting self-insurance, the Company
shall at all times carry and maintain or cause to be carried and maintained in
effect with insurers or reinsurers of recognized responsibility (i) "all risk"
aircraft hull insurance covering the Aircraft and the Engines, (ii) fire,
transit and extended coverage of Engines and Parts while removed from the
Aircraft and not replaced by similar components, and (iii) war risk and allied
perils insurance, including governmental confiscation and expropriation (other
than by the government of registry of the Aircraft) and hijacking insurance
(collectively, "WAR RISK INSURANCE") as contained in London form LSW 555B or its
substantive equivalent or in the case that such coverage is maintained through
the FAA, Chapter 443 of Title 49 of the United States Code as in effect on
September 1, 2004; provided, further, that the foregoing insurance shall at all
times while the Engines are subject to this Mortgage be for an amount (taking
into account self-insurance to the extent permitted by Section D) in the
aggregate applicable to all the Engines not less than the Stipulated Loss Value
of the Engines, and that when any Engine is installed on an Aircraft, the agreed
value of that Aircraft under the relevant policy shall be automatically
increased by the amount of the Stipulated Loss Value of such Engine.

            All losses will be adjusted with the insurers by the Company (giving
due regard to the interest of the Security Trustee). However, in the event that
an Event of Default has occurred and is continuing, all losses will be adjusted
among the Company, the insurers and the Senior Trustee (if the Lien of the
Senior Mortgage shall not then have been discharged) and the Security Trustee
(if the Lien of the Senior Mortgage shall then have been discharged).

            As between the Security Trustee and the Company, the insurance
payments for any property damage loss to any Engine not constituting an Event of
Loss with respect thereto shall be paid, to the extent such proceeds are not
paid by the insurer(s) directly to the person effecting the repair, as follows:
all proceeds less than or equal to the Threshold Amount shall be paid to the
Company (or any Permitted Lessee if directed by the Company), and all proceeds
greater than the Threshold Amount shall be paid to the Senior Trustee (if the
Lien of the Senior Mortgage shall not then have been discharged) and to the
Security Trustee (if the Lien of the Senior Mortgage shall then have been
discharged), to be held as collateral security for the Obligations, and applied
to reimburse the Company for accomplishing repairs and/or replacements as
required, or to pay suppliers directly for such repairs and/or replacements as
directed by the Company (or any Permitted Lessee if directed by the Company). In
the case of any payment to the Security Trustee (other than in respect of an
Event of Loss of an Engine), the Security Trustee shall, upon receipt of
evidence reasonably satisfactory to it that the damage giving rise to such
payment shall have been repaired or that such payment shall then be required to
pay for repairs then being made, pay the amount of such payment, and any
interest or income earned thereon, to the Company or its order.

            2. During any period that an Aircraft or an Engine is on the ground
and not in operation, the Company may carry or cause to be carried, in lieu of
the insurance required by

<PAGE>

                                                                      APPENDIX B
                                                                              3

paragraph 1 above, and subject to the self-insurance to the extent permitted by
Section D hereof, insurance otherwise conforming with the provisions of said
paragraph 1 except that the scope of the risks and the type of insurance shall
be consistent with industry practice for airlines operating only similar-sized
equipment on similar routes the same as from time to time applicable to aircraft
and engines owned or leased and operated by the Company (or any Permitted
Lessee) of the same or similar type which comprise the Company's (or such
Permitted Lessee's) fleet similarly on the ground and not in operation, provided
that, subject to the self-insurance to the extent permitted by Section D hereof,
the Company shall maintain or cause to be maintained insurance against risk of
loss or damage to each Engine in an amount at least equal to the Stipulated Loss
Value of such Engine during such period that such Engine is on the ground and
not in operation.

            C. Reports, Etc. The Company will furnish, or cause to be furnished,
to the Security Trustee on or before the Closing Date and annually on or before
the renewal dates of the Company's (or the Permitted Lessee's) relevant
insurance policies required hereunder, a report, signed by any reputable
recognized independent firm of insurance brokers selected by the Company, which
brokers may be regularly retained by the Company or any Permitted Lessee (the
"INSURANCE BROKER"), describing in reasonable detail the hull and liability
insurance then carried and maintained with respect to the Aircraft and the
Engines and stating the opinion of such firm that, to its knowledge, such
insurance complies with the terms of this Appendix B. Such information shall
remain confidential as provided in Section 6.12 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 and to advise the Security
Trustee at least thirty (30) days (seven (7) days in the case of War Risk
Insurance and 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, provided that, in respect of the War Risk Insurance, the
Insurance Broker shall provide for such shorter period as may be obtainable in
the international insurance market. 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.

            D. Self-Insurance. The Company may self-insure, by way of
deductible, premium adjustment provisions in insurance policies, or otherwise,
under a program applicable to all aircraft in the Company's fleet, the risks
required to be insured against pursuant to Sections A and B hereof but in no
case shall the self-insurance with respect to all of the aircraft in the
Company's fleet (including, without limitation, the Aircraft and the Engines)
exceed the lesser of (x) 50% of the largest replacement value of any single
aircraft in the Company's fleet or (y) 1.5% of the average aggregate insurable
value (during the preceding calendar year) of all aircraft on which the Company
carries insurance, unless the Insurance Broker shall certify that the standard
among major U.S. airlines is a higher level of self-insurance, in which case the
Company may self-insure the Aircraft and the Engines to such higher level.
Notwithstanding the foregoing, the insurance required by Section B.1(i) hereof
may be subject to a per occurrence deductible. With respect to the Aircraft and
the Engines when on-wing, such deductible shall be no greater than the Maximum
Self-Insurance Amount for any one occurrence. Said deductible shall not apply in
the case of a total loss of the Aircraft.

<PAGE>

                                                                      APPENDIX B
                                                                               4

            E. Terms of Insurance Policies. Any policies carried in accordance
with Sections A and B hereof covering the Aircraft and the Engines, and any
policies taken out in substitution or replacement for any such policies, as
applicable, (1) shall name the Security Trustee and each other Secured Party
(the "Additional Insureds") as additional insureds, as their interests may
appear, (2) in the case of hull insurance, shall name the Senior Trustee (until
the Lien of the Senior Mortgage shall have been discharged) and the Security
Trustee (from and after the time that the Lien of the Senior Mortgage shall have
been discharged) as sole loss payee to the extent provided in clause (12) below,
(3) may provide for self-insurance to the extent permitted in Section D, (4)
shall provide that if the insurers cancel such insurance for any reason
whatsoever, or the same is allowed to lapse for nonpayment of premium or if any
material change is made in the insurance which adversely affects the interest of
any Additional Insured, such cancellation, lapse, or change shall not be
effective as to the Additional Insureds for thirty (30) days (or ten (10) days
in the case of nonpayment of premium) after issuance to (but, in the case of War
Risk Insurance, seven (7) days after sending to) the Additional Insureds of
written notice by such insurers of such cancellation or change, provided,
however, that if, the Company's War Risk Insurance provider does not provide for
provision of direct notice to Additional Insureds of cancellation, change or
lapse in the insurance required hereunder, the Company hereby agrees that, upon
receipt of notice (including any notice by publication, if applicable) of any
cancellation, change or lapse thereof from such insurance provider it shall give
the Additional Insureds immediate notice of each cancellation or lapse and
prompt notice of each change of such insurance, (5) shall provide that in
respect of the Additional Insureds' respective interests in such policies the
insurance shall not be invalidated by any action or inaction of the Company (or
any Permitted Lessee) and shall insure the respective interests of the
Additional Insureds regardless of any breach or violation of any warranty,
declaration or condition contained in such policies by the Company (or any
Permitted Lessee), (6) in the case of liability insurances, shall be primary
without any right of contribution from any other insurance which is carried by
any Additional Insured, (7) in the case of liability insurances, shall expressly
provide that all of the provisions thereof, except the limits of liability,
shall operate in the same manner as if a separate policy covered each insured,
(8) shall waive any right of subrogation of the insurers or any right of the
insurers to set-off or counterclaim or any other deduction, whether by
attachment or otherwise, in respect of any liability of any Additional Insured,
(9) shall provide that losses (other than for total loss of an Engine) shall be
adjusted with the Company (or, if an Event of Default or Special Default shall
have occurred which is continuing, with the Senior Trustee (until the Lien of
the Senior Mortgage shall have been discharged) and the Security Trustee (from
and after the time that the Lien of the Senior Mortgage shall have been
discharged)), (10) shall provide that the Additional Insureds are not liable for
any insurance premiums, (11) shall be effective with respect to both domestic
and international operations, (12) shall provide that (i) except as specified in
clause (iii) below, in the event of a loss involving proceeds in excess of the
Threshold Amount, all proceeds in respect of such loss up to the amount of
Stipulated Loss Value for an affected Engine shall, to the extent such proceeds
are not paid by the insurer(s) directly to the person effecting the repair, be
payable to the Senior Trustee (until the Lien of the Senior Mortgage shall have
been discharged) and the Security Trustee (from and after the time that the Lien
of the Senior Mortgage shall have been discharged) to be held by Such Person
(whether such payment is made to the Company (or any Permitted Lessee) or any
third party), it being understood and agreed that in the case of any payment to
the Security Trustee otherwise than in respect of an Event of Loss of the
Engine, the

<PAGE>

                                                                      APPENDIX B
                                                                               5


Security Trustee shall, upon receipt of evidence reasonably satisfactory to it
that the damage giving rise to such payment shall have been repaired or that
such payment shall then be required to pay for repairs then being made or the
replacement of the Engine suffering the Event of Loss, pay the amount of such
payment, and any interest or income earned thereon, to the Company or its order,
(ii) except as specified in the following clause (iii), all proceeds less than
or equal to the Threshold Amount (regardless of the total amount of proceeds
resulting from such loss) and any proceeds of any loss in excess of Stipulated
Loss Value for the Engine suffering such loss shall be paid to the Company or
its order and (iii) notwithstanding anything to the contrary contained in the
preceding clauses (i) and (ii), if a Special Default shall have occurred and be
continuing and the insurers have been notified thereof by the Security Trustee,
all proceeds of loss (other than in excess of the Stipulated Loss Value) shall
be paid to the Senior Trustee (until the Lien of the Senior Mortgage shall have
been discharged) and the Security Trustee (from and after the time that the Lien
of the Senior Mortgage shall have been discharged), (13) if separate hull and
war risk coverage is maintained, shall contain a 50/50 clause in accordance with
AVS 103, (14) shall operate on a worldwide basis subject to certain territorial
restrictions which are usual and customary in the War Risks market from time to
time and (15) shall contain a provision entitling the Security Trustee to
initiate a claim if an Event of Default shall be continuing.

            F. 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 insurance and/or 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.

<PAGE>

                                                                       EXHIBIT A

                       SUBORDINATED MORTGAGE AND SECURITY
                           AGREEMENT SUPPLEMENT NO. __

            Subordinated Mortgage and Security Agreement Supplement No. __ dated
_________, 20__ ("MORTGAGE SUPPLEMENT") of AMERICA WEST AIRLINES, INC. (the
"COMPANY").

                              W I T N E S S E T H:


            WHEREAS, the Subordinated Engine Mortgage and Security Agreement,
dated as of September 3, 2004 (the "MORTGAGE"), between the Company and Wells
Fargo Bank Northwest, National Association (the "SECURITY TRUSTEE"), provides
for the execution and delivery of supplements thereto substantially in the form
hereof which shall particularly describe the Engines (such term and other
defined terms in the Mortgage being used herein with the same meanings);

            NOW, THEREFORE, this Mortgage Supplement WITNESSETH that the Company
hereby confirms that the Lien of the Mortgage on the Collateral covers all of
the Company's right, title and interest in and to the property described on
Annex A hereto.

            To have and to hold all and singular the aforesaid property unto the
Security Trustee, its successors and assigns, for the benefit, security and
protection of the Security Trustee, and for the uses and purposes and subject to
the terms and provision set forth in the Mortgage.

            This Mortgage Supplement 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.

            IN WITNESS WHEREOF, the Company has caused this Subordinated
Mortgage Supplement No. __ to be duly executed by one of its duly authorized
officers, as of the day and year first above written.

                                        AMERICA WEST AIRLINES, INC.
                                        By:_________________________________
                                           Name:
                                           Title:

<PAGE>

                                                                       EXHIBIT A
                                                                               2

                                                                      ANNEX A TO
                                                             MORTGAGE SUPPLEMENT

                             DESCRIPTION OF ENGINES

                                     ENGINES

Manufacturer                  Model                    Manufacturer's Serial No.

Each engine is of 750 or more "rated take-off horsepower" or the equivalent of
such horsepower.

<PAGE>

                                                                       EXHIBIT B
                                    EXHIBIT B

                            FORM OF LETTER OF CREDIT

 Wells Fargo Bank Northwest, National Association,
        as Security Trustee
299 South Main Street, 12th Floor
Salt Lake City, UT  84111

Dated _________

This Letter of Credit is provided pursuant to the Subordinated Engine 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 (the "SECURITY TRUSTEE"). This letter of credit however creates
primary obligations on us and is independent from the mortgage.

On the instructions of America West Airlines, Inc. and for its account, we
hereby establish this irrevocable Letter of Credit to authorize the Security
Trustee, to draw on [APPROPRIATE BRANCH/DEPARTMENT DETAILS/ADDRESS OF ISSUING
BANK] an amount or amounts not exceeding a total of USD [AMOUNT IN FIGURES
(AMOUNT IN WORDS] United States Dollars) upon receipt by us of a signed demand
certificate from you in the following format (with the square bracketed sections
completed):

"The undersigned as an authorized signatory or representative of the Security
Trustee hereby draws upon your irrevocable Letter of Credit dated [DATE OF THIS
LETTER OF CREDIT] and instructs you to transfer US$ [AMOUNT IN FIGURES] ([AMOUNT
IN WORDS] United States Dollars) to [INSERT APPROPRIATE BANK DETAILS]
immediately."

We will honor drawings under this Letter of Credit upon our receipt of such a
demand certificate (by facsimile to fax number: [BANK FAX NUMBER], mail, courier
service or by hand) and will make payment to the account specified in the demand
certificate, for value no later than close of business on the next succeeding
banking day following our receipt of the demand certificate. If any drawing
hereunder does not conform with these terms, we shall promptly notify you of
that, state the reason(s) why and hold the document(s) presented at your
disposal (or return them to you if you so request).

Partial drawings are permitted.

This letter of credit expires on [INITIAL EXPIRY DATE] ("Expiry Date") but shall
be automatically extended, without the need for amendment, for one year from the
said Expiry Date and annually thereafter unless at least 60 days prior to the
then applicable Expiry Date we have notified you by registered mail that we will
not renew the letter of credit for the following year.

<PAGE>

This Letter of Credit is transferable and constitutes an obligation to make
payment against documents.

(1) Except as provided above, this Letter of Credit is issued subject to the
Uniform Customs and Practice for Documentary Credits (1993 Revision)
International Chamber of Commerce Publication No. 500 and is governed by New
York law. Unless you otherwise require, any disputes arising out of or in
connection with this letter of credit shall be resolved before the United States
District Court for the Southern District of New York and any New York state
court sitting in the County of New York, New York, and all related appellate
courts.

All bank charges, including, but not by way of limitation, fees or commissions,
shall be for the applicant's account.

----------
(1) Alternatively where bank wants to use ISP 98: Except as provided above, this
Letter of Credit is issued subject to the International Standby Practices 1998
and is governed by New York law. Unless you otherwise require, any disputes
arising out of or in connection with this letter of credit shall be resolved
before the United States District Court for the Southern District of New York
and any New York state court sitting in the County of New York, New York, and
all related appellate courts.

<PAGE>

                                                                      SCHEDULE I

                               PERMITTED COUNTRIES

<TABLE>
<S>                                      <C>                                  <C>
Argentina                                Indonesia                            Poland
Australia                                Ireland                              Portugal
Austria                                  Italy*
                                                                              Singapore
Bahamas                                  Jamaica                              Slovakia*
Belgium                                  Japan                                South Africa
Brazil                                   Jordan                               South Korea
                                                                              Sweden
Canada                                   Kuwait                               Switzerland
Chile
Cyprus*                                  Luxembourg                           Trinidad and Tobago
Czech Republic                                                                Tunisia
                                         Malaysia
Denmark                                  Malta                                United Kingdom
                                         Mexico                               Uruguay*
France

                                         Netherlands*                         Venezuela*
Germany                                  New Zealand
Greece                                   Norway

Hungary                                  Paraguay*
                                         People's Republic of China
Iceland                                  Philippines
</TABLE>

------------

*Notwithstanding anything to the contrary set forth elsewhere in this Mortgage,
a lease of any Engine to an operator domiciled in any of these jurisdictions
shall be permitted only if (i) the Company and International Aero Engines, Inc.
(IAE) shall have entered into a lease with respect to such Engine that is fully
recourse to IAE, and (ii) the lease of such Engine to the operator is a sublease
from IAE to such operator. For the avoidance of doubt, with respect to any such
arrangement, IAE, and not the operator, would be deemed the "Lessee" or
"Permitted Lessee" as such terms are used in this Mortgage.