1
                                                                    EXHIBIT 4.34




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                           SECOND AMENDED AND RESTATED
                     TRUST INDENTURE AND SECURITY AGREEMENT

                                 [GPA 1989 BN-6]



                          Dated as of November 26, 1996



                                     between


                            WILMINGTON TRUST COMPANY,
                         not in its individual capacity
                       except as expressly provided herein
                           but solely as Owner Trustee


                                       and


                            THE CHASE MANHATTAN BANK,
                         not in its individual capacity
                       except as expressly provided herein
                         but solely as Indenture Trustee




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                        Secured Equipment Notes Covering
                          One Airbus A320-231 Aircraft
                          Manufacturer's Serial No. 65
                             Registration No. N626AW
                      Leased by America West Airlines, Inc.


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   2
                                TABLE OF CONTENTS



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                                                                            ----


                                                                         
GRANTING CLAUSE..............................................................  3
HABENDUM CLAUSE..............................................................  7

                                    ARTICLE I

                                   DEFINITIONS

SECTION 1.01.  Special Definitions...........................................  9

                                   ARTICLE II

                               THE EQUIPMENT NOTES

SECTION 2.01.  Form of Equipment Notes....................................... 22
SECTION 2.02.  Issuance and Terms of Equipment Notes......................... 28
SECTION 2.03.  Payments from Trust Indenture Estate
                  Only....................................................... 31
SECTION 2.04.  Method of Payment............................................. 32
SECTION 2.05.  Application of Payments....................................... 35
SECTION 2.06.  Termination of Interest in Trust
                  Indenture Estate........................................... 36
SECTION 2.07.  Registration, Transfer and Exchange of
                  Equipment Notes............................................ 36
SECTION 2.08.  Mutilated, Destroyed, Lost or Stolen
                  Equipment Notes............................................ 37
SECTION 2.09.  Payment of Expenses on Transfer;
                  Cancellation............................................... 38
SECTION 2.10.  Mandatory Redemptions of Equipment
                  Notes...................................................... 38
SECTION 2.11.  Redemptions; Notice of Redemption............................. 39
SECTION 2.12.  Option to Purchase Equipment Notes............................ 40
SECTION 2.13.  Subordination................................................. 41

                                   ARTICLE III

                    RECEIPT, DISTRIBUTION AND APPLICATION OF
                     INCOME FROM THE TRUST INDENTURE ESTATE

SECTION 3.01.  Certain Rent Distributions.................................... 42
SECTION 3.02.  Event of Loss and Replacement................................. 43
SECTION 3.03.  Payment After Indenture Event of
                  Default, etc............................................... 44
SECTION 3.04.  Certain Payments.............................................. 47
SECTION 3.05.  Other Payments................................................ 48
SECTION 3.06.  Payments to Owner Trustee..................................... 48
SECTION 3.07.  Investment of Amounts Held by Indenture
                              Trustee........................................ 49



                                 Trust Indenture
   3
                                     - ii -




                                                                            Page
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                                   ARTICLE IV

                      COVENANTS OF TRUST COMPANY AND OWNER
                      TRUSTEE; INDENTURE EVENTS OF DEFAULT;
                          REMEDIES OF INDENTURE TRUSTEE

                                                                         
SECTION 4.01.  Covenants of Trust Company and Owner
                    Trustee.................................................. 49
SECTION 4.02.  Indenture Events of Default................................... 51
SECTION 4.03.  Certain Rights................................................ 54
SECTION 4.04.  Remedies...................................................... 55
SECTION 4.05.  Return of the Aircraft, etc................................... 59
SECTION 4.06.  Remedies Cumulative........................................... 60
SECTION 4.07.  Discontinuance of Proceedings................................. 60
SECTION 4.08.  Waiver of Past Indenture Defaults............................. 61
SECTION 4.09.  Indenture Trustee May Prove Debt.............................. 61
SECTION 4.10.  Limitations on Suits by Note Holders.......................... 63
SECTION 4.11.  Unconditional Right of Note Holders to
                    Receive Principal, Interest and
                    Premium, and to Institute Certain
                    Suits.................................................... 64
SECTION 4.12.  Exercise of Remedies by Foreign Note
                    Holders.................................................. 64

                           ARTICLE V

                DUTIES OF THE INDENTURE TRUSTEE

SECTION 5.01.  Notice of Indenture Event of Default.......................... 64
SECTION 5.02.  Action Upon Instructions...................................... 65
SECTION 5.03.  Indemnification............................................... 66
SECTION 5.04.  No Duties Except as Specified in
                    Indenture or Instructions................................ 66
SECTION 5.05.  No Action Except Under Lease, Refunding
                    Agreement, Indenture or Instructions..................... 67
SECTION 5.06.  Replacement Airframes, Replacement
                    Engines and Replacement Parts............................ 67
SECTION 5.07.  Indenture Supplements for Replacements........................ 71
SECTION 5.08.  Effect of Replacement......................................... 71
SECTION 5.09.  Notices, etc.................................................. 71
SECTION 5.10.  Certain Rights of Owner Trustee and
                    Owner Participant........................................ 72
SECTION 5.11.  Evidence of Action Taken by Note Holder....................... 74
SECTION 5.12.  Right of Revocation of Action Taken........................... 74

                                   ARTICLE VI

                   THE OWNER TRUSTEE AND THE INDENTURE TRUSTEE

SECTION 6.01.  Acceptance of Trusts and Duties............................... 75
SECTION 6.02.  Absence of Duties............................................. 75


                                 Trust Indenture
   4
                                     - iii -




                                                                            Page
                                                                            ----

                                                                         
SECTION 6.03.  No Representations or Warranties as to
                   Aircraft or Documents.................................... 76
SECTION 6.04.  No Segregation of Moneys; No Interest........................ 77
SECTION 6.05.  Reliance; Agents; Advice of Counsel.......................... 77
SECTION 6.06.  Capacity in Which Acting..................................... 78
SECTION 6.07.  Compensation................................................. 78
SECTION 6.08.  May Become Note Holder....................................... 78
SECTION 6.09.  Further Assurances; Financing
                   Statements............................................... 78

                                   ARTICLE VII

              INDEMNIFICATION OF INDENTURE TRUSTEE BY OWNER TRUSTEE

SECTION 7.01.  Scope of Indemnification..................................... 79
SECTION 7.02.  Exculpation and Release of Liability......................... 80

                                  ARTICLE VIII

                    SUCCESSOR TRUSTEES AND SEPARATE TRUSTEES

SECTION 8.01.  Notice of Successor Owner Trustee............................ 80
SECTION 8.02.  Resignation and Removal of Indenture
                   Trustee; Appointment of Successor........................ 80
SECTION 8.03.  Appointment of Separate Trustees............................. 82

                                   ARTICLE IX

                       SUPPLEMENTS AND AMENDMENTS TO THIS
                          INDENTURE AND OTHER DOCUMENTS

SECTION 9.01.  Lease Amendments and Supplemental
                   Indentures............................................... 84
SECTION 9.02.  Effect of Supplemental Indenture............................. 87
SECTION 9.03.  Documents to Be Given to Trustee............................. 87
SECTION 9.04.  Notation on Notes in Respect of
                   Supplemental Indentures.................................. 87
SECTION 9.05.  Trustees Protected........................................... 87
SECTION 9.06.  Documents Mailed to Note Holders............................. 88
SECTION 9.07.  No Request Necessary for Lease
                   Supplement or Indenture Supplement....................... 88
SECTION 9.08.  Notices to Liquidity Provider................................ 88

                                    ARTICLE X

                                  MISCELLANEOUS

SECTION 10.01.  Termination of Indenture.................................... 88
SECTION 10.02.  No Legal Title to Trust Indenture
                   Estate in Note Holders................................... 89


                                 Trust Indenture
   5
                                     - iv -




                                                                            Page
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SECTION 10.03.  Sale of Aircraft by Indenture Trustee
                   is Binding............................................... 89
SECTION 10.04.  Indenture for Benefit of Owner Trustee,
                   Indenture Trustee, Owner Participant,
                   Lessee and Note Holders.................................. 89
SECTION 10.05.  No Action Contrary to Lessee's Rights
                   Under the Lease.......................................... 90
SECTION 10.06.  Notices..................................................... 90
SECTION 10.07.  Severability................................................ 90
SECTION 10.08.  No Oral Modifications or Continuing
                   Waivers.................................................. 90
SECTION 10.09.  Successors and Assigns...................................... 91
SECTION 10.10.  Headings.................................................... 91
SECTION 10.11.  Normal Commercial Relations................................. 91
SECTION 10.12.  Governing Law; Counterpart Form............................. 91
SECTION 10.13.  Section 1110................................................ 91
SECTION 10.14.  JL Security Agreement....................................... 92


EXHIBIT A   -  Form of Trust Indenture Supplement

SCHEDULE I  -  Equipment Notes Amortization
SCHEDULE II -  Pass Through Trust Agreements



                                 Trust Indenture
   6
                           SECOND AMENDED AND RESTATED
                     TRUST INDENTURE AND SECURITY AGREEMENT
                                 [GPA 1989 BN-6]



                  SECOND AMENDED AND RESTATED TRUST INDENTURE AND SECURITY
AGREEMENT [GPA 1989 BN-6] (this "Second Amended and Restated Indenture" or this
"Indenture") dated as of November 26, 1996, between WILMINGTON TRUST COMPANY, a
Delaware banking corporation, not in its individual capacity except as otherwise
specifically set forth herein, but solely as owner trustee under the Trust
Agreement referred to below (in such capacity, together with its successors, the
"Owner Trustee"), and THE CHASE MANHATTAN BANK (formerly known as Chemical Bank,
successor by merger to Manufacturers Hanover Trust Company), a New York
corporation, not in its individual capacity except as otherwise specifically set
forth herein, but solely as indenture trustee hereunder (in such capacity,
together with its successors, the "Indenture Trustee").


                              W I T N E S S E T H :

                  WHEREAS, all capitalized terms used herein shall have the
respective meanings set forth or referred to in Article I hereof;

                  WHEREAS, the Owner Participant and Wilmington Trust Company
entered into the Trust Agreement [GPA 1989 BN-6] dated as of December 15, 1989,
as supplemented by Trust Agreement Supplement [GPA 1989 BN-6] No. 1 dated
December 22, 1989, as further supplemented by Trust Agreement Supplement [GPA
1989 BN-6] No. 2 dated October 24, 1991, and as further supplemented by Trust
Agreement Supplement [GPA 1989 BN-6] No. 3 dated the date hereof (as amended,
supplemented or otherwise modified from time to time in accordance with the
terms thereof, hereof and of the Refunding Agreement, the "Trust Agreement"),
whereby, among other things, Wilmington Trust Company has declared a certain
trust for the use and benefit of the Owner Participant, subject, however, to the
Trust Indenture Estate created pursuant hereto for the use and benefit of (to
the extent set forth herein), and with the priority of certain payments to, the
Holders of Equipment Notes issued hereunder, and the Owner Trustee is authorized
and directed to execute and deliver this Indenture;

                  WHEREAS, (i) the Owner Trustee and the Indenture Trustee
entered into the Trust Indenture and Security Agreement [GPA 1989 BN-6] dated as
of December 15, 1989, as supplemented by Trust Indenture Supplement No. 1 dated
December 22, 1989, which were recorded by the Federal Aviation Administration on
April 2, 1990 as one instrument and assigned Conveyance No. V79847 (as so
supplemented or otherwise modified to the date hereof, the "Original
Indenture"), (ii) the Owner Trustee and the Original

                                 Trust Indenture
   7
                                      - 2 -



Head Lessee entered into the Aircraft Lease Agreement [GPA 1989 BN-6] dated as
of December 15, 1989, as supplemented by Lease Supplement [GPA 1989 BN-6] No. 1
dated December 22, 1989, which were recorded by the Federal Aviation
Administration on April 2, 1990 as one instrument and assigned Conveyance No.
V79848 (as so supplemented or otherwise modified to the date hereof, the
"Original Lease") and (iii) pursuant to the Original Indenture, the Owner
Trustee issued and sold to the Original Loan Participants (as defined in the
Original Indenture) the Original Loan Certificates;

                  WHEREAS, (i) the Owner Trustee and the Indenture Trustee
entered into an Amended and Restated Trust Indenture and Security Agreement [GPA
1989 BN-6] dated as of October 1, 1991, as supplemented by the Trust Indenture
Supplement No. 2 [GPA 1989 BN-6], dated October 24, 1991, which were recorded by
the Federal Aviation Administration on November 12, 1991 as one document and
assigned Conveyance No. Z91423 (as amended, supplemented or otherwise modified
to the date hereof, the "First Amended and Restated Indenture"), (ii) the Owner
Trustee and the Original Head Lessee entered into an Amended and Restated
Aircraft Lease Agreement [GPA 1989 BN-6] dated as of October 1, 1991, which
amended and restated the Original Lease, as supplemented by Lease Supplement
[GPA 1989 BN-6] No. 2 dated October 24, 1991, which were recorded by the Federal
Aviation Administration on November 12, 1991 as one document and assigned
Conveyance No. Z91424 (as amended, supplemented or otherwise modified to the
date hereof, the "First Amended and Restated Lease") and (iii) pursuant to the
First Amended and Restated Indenture, the Owner Trustee issued and sold to the
Certificate Holders (as defined in the First Amended and Restated Indenture)
Equipment Trust Certificates, Series BN-6 in exchange for the Original Loan
Certificates;

                  WHEREAS, the parties have agreed to (i) assign, amend and
restate the First Amended and Restated Lease pursuant to Assignment and
Amendment No. 1 and Sublease Termination Agreement [GPA 1989 BN-6] dated as of
the date hereof among the Original Head Lessee, as assignor and the Original
Sublessee, as assignee, the Owner Trustee and the Indenture Trustee and the
Second Amended and Restated Aircraft Lease Agreement [GPA 1989 BN-6] dated as of
the date hereof between the Owner Trustee and the Lessee (as so assigned,
amended and restated, the "Second Amended and Restated Lease" or the "Lease")
and to enter into Lease Supplement No. 3 and (ii) cause the implementation of
the Refinancing Transaction pursuant to which, among other things, the Equipment
Trust Certificates issued to the Certificate Holders pursuant to the First
Amended and Restated Indenture shall be redeemed and new Equipment Notes shall
be issued to the Pass Through Trustees (or their designee);


                                 Trust Indenture
   8
                                      - 3 -



                  WHEREAS, in light of the foregoing and in anticipation of the
Refinancing Transaction, the parties desire by this Second Amended and Restated
Indenture, among other things, (i) to amend and restate in its entirety the
First Amended and Restated Indenture, (ii) to provide for the issuance by the
Owner Trustee of the Equipment Notes and (iii) to provide for the assignment,
mortgage and pledge by the Owner Trustee to the Indenture Trustee, as part of
the Trust Indenture Estate hereunder, among other things, of certain of the
Owner Trustee's estate, right, title and interest in and to the Aircraft and,
except as hereinafter expressly provided, all of the Owner Trustee's right,
title and interest in, to and under the Lease (as amended and restated to date
and as the same may at any time and from time to time be further amended,
restated or otherwise modified in accordance with the terms thereof and hereof)
and all payments and other amounts received hereunder or thereunder in
accordance with the terms hereof or thereof, as security for, among other
things, the Owner Trustee's obligations to the Indenture Trustee, for the
ratable benefit and security of the Note Holders, subject to Section 2.13 and
Article III hereof;

                  WHEREAS, all things have been done to make the Equipment
Notes, when executed by the Owner Trustee and authenticated, issued and
delivered by the Indenture Trustee hereunder, the legal, valid and binding
obligations of the Owner Trustee; and

                  WHEREAS, all things necessary to make this Second Amended and
Restated Indenture the legal, valid and binding obligation of the Owner Trustee,
for the uses and purposes herein set forth, in accordance with its terms, have
been done and performed and have happened;


                                 GRANTING CLAUSE

                  NOW, THEREFORE, THIS SECOND AMENDED AND RESTATED TRUST
INDENTURE AND SECURITY AGREEMENT WITNESSETH, that, to secure the prompt payment
of the Principal Amount of, interest on, Make- Whole Amount, if any, and all
other amounts due with respect to, all Equipment Notes from time to time
outstanding hereunder and the performance and observance by the Owner Trustee of
all the agreements, covenants and provisions contained herein and in the
Refunding Agreement and the Equipment Notes, for the benefit of the Note
Holders, and the prompt payment of any and all amounts from time to time owing
hereunder and under the Refunding Agreement by the Owner Trustee, the Owner
Participant and the Lessee to the Note Holders and for the uses and purposes and
subject to the terms and provisions hereof, and in consideration of the premises
and of the covenants herein contained, and of the acceptance of the Equipment
Notes by the Holders thereof, and of

                                 Trust Indenture
   9
                                      - 4 -



the sum of $1 paid to the Owner Trustee by the Indenture Trustee at or before
the delivery hereof, the receipt whereof is hereby acknowledged, the Owner
Trustee 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 Indenture Trustee, its
successors and assigns, for the security and benefit of the Note Holders from
time to time, a first priority security interest in and mortgage Lien on all
estate, right, title and interest of the Owner Trustee in, to and under the
following described property, rights, interests and privileges, whether now or
hereafter acquired, other than Excepted Payments (which collectively, excluding
Excepted Payments but including all property hereafter specifically subjected to
the Lien of this Indenture by any Indenture Supplement or any indenture
supplemental hereto, are included within the Trust Indenture Estate), to wit:

                  (1) the Aircraft (including the Airframe and the Engines) and
         all replacements thereof and substitutions therefor to which the Owner
         Trustee shall from time to time acquire an interest under any of the
         Lease, the Japanese Lease Agreement, the First Japanese Lease
         Assignment or the Second Japanese Lease Assignment, all as more
         particularly described in the Indenture Supplement executed and
         delivered with respect to the Aircraft or any such replacements or
         substitutions therefor, as provided in this Indenture, and all records,
         logs and other documents to which the Owner Trustee shall from time to
         time acquire an interest at any time maintained by the Lessee with
         respect to the foregoing property;

                  (2) the Lease (including each Lease Supplement) and all Rent
         thereunder, including, without limitation, all amounts of Basic Rent,
         Supplemental Rent and payments of any kind thereunder; the Refunding
         Agreement; the Purchase Agreement (to the extent assigned to or for the
         benefit of the Owner Trustee); the Purchase Agreement Warranties
         Assignment; the Second Aircraft Warranty Bill of Sale; the Japanese
         Lease Agreement, the Japanese Lease Supplement, the Supplemental
         Agreement, the Japanese Lessor's Consent, the Assumption Agreement, the
         Confirmation Agreement, the FUYO Guaranty, the JL Security Agreement
         and the Omnibus Agreement (each to the extent assigned by the First
         Japanese Lease Assignment and the Second Japanese Lease Assignment);
         the First Japanese Lease Assignment; the Second Japanese Lease
         Assignment; all documents and property and interest therein assigned by
         the First Japanese Lease Assignment and the Second Japanese Lease
         Assignment to the extent not otherwise covered; the BFE Bill of Sale;
         each notice, letter agreement or other document related to any of the
         foregoing

                                 Trust Indenture
   10
                                      - 5 -



         entered into by or for the benefit of the Owner Trustee (or assigned to
         the Owner Trustee); in each case including, without limitation, (x) all
         rights of the Owner Trustee to exercise any election or option or to
         make any decision or determination or to give any notice, consent,
         waiver or approval or to take any other action under or in respect of
         any such document or to accept surrender or redelivery of the Aircraft
         or any part thereof, as well as all the rights, powers and remedies on
         the part of the Owner Trustee, whether arising under any such document
         or by statute or at law or in equity, or otherwise, arising out of any
         Lease Event of Default or any "Event of Default" under and as defined
         in the Japanese Lease Agreement, and (y) any right to restitution from
         the Lessee, the Manufacturer or any other Person in respect of any
         determination of invalidity of any such document, it being agreed that
         the rights, powers and remedies referred to in the preceding clauses
         (x) and (y) are presently assigned and transferred to the Indenture
         Trustee and may, except as provided in Section 5.10 or elsewhere in
         this Indenture, be exercised by the Indenture Trustee without the
         necessity of proceeding under Section 4.04 to exercise remedies
         hereunder;

                  (3) each Sublease Assignment and each Assigned Sublease (to
         the extent assigned under such Sublease Assignment), and including,
         without limitation, all rents or other payments of any kind made under
         such Assigned Sublease (to the extent assigned under such Sublease
         Assignment), all collateral security or credit support (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
         Permitted Sublessee thereunder (to the extent assigned under such
         Sublease Assignment) and all rights of the Owner Trustee to exercise
         any election or option or to give any notice, consent, waiver, or
         approval under or with respect of any thereof or to accept any
         surrender of the Aircraft or any part thereof as well as any rights,
         powers or remedies on the part of the Owner Trustee (in each case to
         the extent assigned to the Owner Trustee), whether arising under any
         Assigned Sublease or any Sublease Assignment or by statute or at law or
         in equity, or otherwise, arising out of any default under any Assigned
         Sublease, it being agreed that the rights, powers and remedies referred
         to above in this paragraph (3) are presently assigned and transferred
         to the Indenture Trustee and may, except as provided in Section 5.10 or
         elsewhere in this Indenture, be exercised by the Indenture Trustee
         without the necessity of proceeding under Section 4.04 to exercise
         remedies hereunder;


                                 Trust Indenture
   11
                                      - 6 -



                  (4) all tolls, rents, issues, profits, revenues and other
         income of the property subjected or required to be subjected to the
         Lien of this Indenture, including, without limitation, all payments or
         proceeds payable to the Owner Trustee after termination of the Lease
         with respect to the Aircraft as the result of the sale, lease or other
         disposition thereof, and all estate, right, title and interest of every
         nature whatsoever of the Owner Trustee in and to the same and every
         part thereof;

                  (5) all requisition proceeds with respect to the Aircraft or
         any part thereof (to the extent of the Owner Trustee's interest therein
         pursuant to the Lease and/or the Japanese Lease Agreement), and all
         insurance proceeds with respect to the Aircraft or any part thereof,
         including but not limited to the insurance required under Section 12 of
         the Lease or under any comparable provision of any Assigned Sublease
         (but excluding any excess insurance maintained by the Lessee and not
         required under Section 12 of the Lease or any Assigned Sublease);

                  (6) all moneys and securities now or hereafter paid or
         deposited or required to be paid or deposited to or with the Indenture
         Trustee by or for the account of the Owner Trustee pursuant to any term
         of any Operative Document and held or required to be held by the
         Indenture Trustee hereunder;

                  (7) all rights of the Owner Trustee to amounts paid or payable
         by the Lessee to the Owner Trustee under the Refunding Agreement and
         all rights of the Owner Trustee to enforce payments of any such amounts
         thereunder; and

                  (8)      all proceeds of the foregoing.

Concurrently with the delivery of the Original Indenture, the Owner Trustee
delivered to the Indenture Trustee the chattel paper original executed
counterparts of the Original Lease and Lease Supplement No. 1, certified copies
of the Purchase Agreement, and execution copies of the Purchase Agreement
Warranties Assignment, the Japanese Lease Agreement, the Japanese Lease
Supplement, the First Japanese Lease Assignment, the Second Japanese Lease
Assignment, the Japanese Lessor's Consent, the Assumption Agreement, the
Confirmation Agreement, the FUYO Guaranty, the Supplemental Agreement, and the
JL Security Agreement. The Owner Trustee thereafter delivered to the Indenture
Trustee the original BFE Bill of Sale. Concurrently with the delivery of the
First Amended and Restated Indenture, the Owner Trustee delivered to the
Indenture Trustee the chattel paper original executed counterparts of the First
Amended and Restated Lease and Lease Supplement No. 2. Concurrently with the
delivery of this Second Amended and Restated Indenture, the Owner

                                 Trust Indenture
   12
                                      - 7 -



Trustee is delivering to the Indenture Trustee the chattel paper original
executed counterparts of the Second Amended and Restated Lease and Lease
Supplement No. 3. All property referred to in this Granting Clause, whenever
acquired by the Owner Trustee, shall secure all obligations under and with
respect to the Equipment Notes at any time outstanding. Any and all properties
referred to in this Granting Clause which are hereafter acquired by the Owner
Trustee, shall, without further conveyance, assignment or act by the Owner
Trustee or the Indenture Trustee thereby become and be subject to the security
interest hereby granted as fully and completely as though specifically described
herein.


                                 HABENDUM CLAUSE

                  TO HAVE AND TO HOLD all and singular the aforesaid property
unto the Indenture Trustee, its successors and assigns, in trust for the benefit
and security of the Note Holders from time to time, except as set forth in
Section 2.13 and Article III hereof without any preference, distinction or
priority of any one Equipment Note over any other regardless of when issued, and
for the uses and purposes and subject to the terms and provisions set forth in
this Indenture.

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

                  The Owner Trustee does hereby constitute the Indenture Trustee
the true and lawful attorney of the Owner Trustee, irrevocably, with full power
(in the name of the Owner Trustee or otherwise) to ask, require, demand, receive
and give acquittance for any and all moneys and claims for moneys (in each case
including insurance and requisition proceeds but excluding Excepted Payments)
due and to become due to the Owner Trustee under or arising out of the Indenture
Documents and all other property which now or hereafter constitutes part of the
Trust

                                 Trust Indenture
   13
                                      - 8 -



Indenture Estate, 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 proceedings which the Indenture Trustee may deem to be necessary
or advisable in the premises. Under the Lease, the Lessee is directed to make
all payments of Rent (other than Excepted Payments) and all other amounts which
are required to be paid to or deposited with the Owner Trustee pursuant to the
Lease (other than Excepted Payments) directly to the Indenture Trustee at such
address or addresses as the Indenture Trustee shall specify, for application as
provided in this Indenture. Pursuant to each Sublease Assignment, each Permitted
Sublessee will be directed from and after (i) notice of the occurrence of a
Lease Event of Default and (ii) notice that the Lease is declared or deemed in
default, to make all payments of rent and all other amounts which are required
to be paid to or deposited with the Lessee pursuant to the related Assigned
Sublease and which are assigned thereunder directly to the Indenture Trustee at
such address or addresses as the Indenture Trustee shall specify, for
application or to be held as provided in this Indenture. The Owner Trustee
agrees that promptly on receipt thereof, it will transfer to the Indenture
Trustee any and all moneys from time to time received by it constituting part of
the Trust Indenture Estate, for distribution by the Indenture Trustee pursuant
to this Indenture, except (a) to the extent the Owner Trustee is entitled to
distribution of such moneys pursuant to this Indenture and (b) that the Owner
Trustee shall accept for distribution pursuant to the Trust Agreement any
amounts distributed to it by the Indenture Trustee under this Indenture.

                  The Owner Trustee agrees that at any time and from time to
time, upon the written request of the Indenture Trustee, the Owner Trustee 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 Indenture Trustee may
reasonably deem desirable in obtaining the full benefits of the assignment
hereunder and of the rights and powers herein granted.

                  The Owner Trustee does hereby warrant and represent that it
has not assigned or pledged, and hereby covenants that it will not assign or
pledge or otherwise dispose of, so long as this Indenture shall remain in effect
and the Lien hereof shall not have been released pursuant to Section 10.01
hereof, any of its estate, right, title or interest hereby assigned, to anyone
other than the Indenture Trustee, and that, with respect to such estate, right,
title and interest hereby assigned, subject to its rights pursuant to Section 
5.10 hereof, it will not, except as provided in this Indenture (including,
without limitation, Section 9.01) and except as to Excepted Payments, (i) accept
any payment from the Lessee, any Permitted Sublessee, FUYO or the Japanese
Lessor under any of the Indenture Documents, enter into any agreement amending,
modifying or supplementing any of the

                                 Trust Indenture
   14
                                      - 9 -



Indenture Documents, or execute any waiver or modification of, or consent under,
the terms of any of the Indenture Documents, (ii) settle or compromise any claim
arising under any of the Indenture Documents, (iii) give any notice or exercise
any right or take any action under any of the Indenture Documents, or (iv)
submit or consent to the submission of any dispute, difference or other matter
arising under or in respect of any of the Indenture Documents to arbitration
thereunder. For purposes of Section 4.02(e) hereof, this is the fourth paragraph
following the Habendum Clause.

                  The Owner Trustee hereby ratifies and confirms its obligations
under the Indenture Documents and does hereby agree that (except as permitted
herein) it will not take, or omit to take, any action, the taking or omission of
which might result in an alteration or impairment of any of the Indenture
Documents or of any of the rights created by any thereof or the assignment
hereunder.

                  Notwithstanding the Granting Clause or any of the preceding
paragraphs, there is hereby excluded from the foregoing sale, transfer,
assignment, grant, pledge and security interest all Excepted Payments. Further,
nothing in the Granting Clause or the preceding paragraphs shall impair any of
the rights of the Owner Trustee or the Owner Participant under Section 5.10
hereof.

                  IT IS HEREBY COVENANTED AND AGREED by and between the parties
hereto as follows:

                                    ARTICLE I

                                   DEFINITIONS

                  SECTION 1.01. Special Definitions. The definitions contained
in the Lease shall apply for all purposes of this Indenture except that the
following terms shall have the following meanings (such definitions to be
equally applicable to both the singular and plural forms of the terms defined)
for all purposes of this Indenture. Except as otherwise indicated, all the
agreements or instruments defined herein or in the Lease shall mean such
agreements or instruments as the same may from time to time be supplemented or
amended or the terms thereof waived or modified to the extent permitted by, and
in accordance with, the terms thereof and of the other Operative Documents and
references to various Persons shall be deemed to be references to and include
their respective permitted successors and assigns.

                  "Amortization Amount" means, with respect to any Principal
         Amount Repayment Date, the amount set forth opposite such Principal
         Amount Repayment Date on the Amortization Schedule.

                                 Trust Indenture
   15
                                     - 10 -




                  "Amortization Schedule" means the amortization schedule for
         the Equipment Notes delivered pursuant to Section 2.02 hereof.

                  "Assigned Sublease" means a Permitted Sublease required to be
         assigned to the Owner Trustee pursuant to Section 6(a) of the Lease.

                  "Assumption Agreement" means, collectively, the two Assumption
         Agreements dated as of September 28, 1989 between GPA Offshore and the
         Grand Cayman branch of the Japanese Lender.

                  "Average Life Date" for each Equipment Note to be redeemed
         shall be the date which follows the redemption date by a period equal
         to the Remaining Weighted Average Life at the redemption date of such
         Equipment Note. "Remaining Weighted Average Life" of such Equipment
         Note, at the redemption date of such Equipment Note, shall be the
         number of days equal to the quotient obtained by dividing (a) the sum
         of the products obtained by multiplying (i) the amount of each then
         remaining installment of principal, including the payment due on the
         maturity date of such Equipment Note, by (ii) the number of days from
         and including the redemption date to but excluding the scheduled
         payment date of such principal installment; by (b) the then unpaid
         Principal Amount of such Equipment Note.

                  "Bankruptcy Code" means Chapter 11 of Title 11 of the
         United States Code, 11 U.S.C. Sections 101 et seq., as amended.

                  "BFE Bill of Sale" means the full warranty (as to title) bill
         of sale covering the Buyer Furnished Equipment, transferring all right,
         title and interest therein to the Owner Trustee.

                  "Business Day" means a day other than a Saturday, Sunday or a
         day on which banks are required or authorized to close in either The
         City of New York, New York or Hartford, Connecticut.

                  "Cash Collateral Account" means one or more Eligible Deposit
         Accounts in the name of the Subordination Agent each maintained at the
         Subordination Agent, into which all amounts drawn under one or more
         Liquidity Facilities pursuant to Section 3.6(c) or 3.6(i) of the
         Intercreditor Agreement shall be deposited.

                  "Code" means the Internal Revenue Code of 1986, as
         amended.


                                 Trust Indenture
   16
                                     - 11 -



                  "Confirmation Agreement" means, collectively, Confirmation 
         No. 1 and Confirmation No. 2.

                  "Confirmation No. 1" has the meaning set forth in Appendix X 
         to the Japanese Lease Agreement.

                  "Confirmation No. 2" has the meaning set forth in Appendix X 
         to the Japanese Lease Agreement.

                  "Continuous Stay Period" has the meaning specified in
         Section 4.04(a).

                  "Corporate Trust Office" means the principal corporate trust
         office of the Indenture Trustee located at 450 West 33rd Street, New
         York, New York 10001, Attention: Corporate Trust Department, or such
         other office at which the Indenture Trustee's corporate trust business
         shall be administered that the Indenture Trustee shall have specified
         by notice in writing to the Lessee, the Owner Trustee and the Note
         Holders.

                  "Debt" means any liability for borrowed money, or any
         liability for the payment of money in connection with any letter of
         credit transaction, or other liabilities evidenced or to be evidenced
         by bonds, debentures, notes or other similar instruments.

                  "Debt Rate" means, with respect to Series A, Series B, Series
         C and Series D, the rate per annum specified for such Series under the
         heading "Debt Rate" in Schedule I to this Indenture.

                  "Delivery Date" means December 22, 1989.

                  "Deposit Agreement" means the Deposit Agreement dated as of
         September 28, 1989 between Barclays Bank PLC, a public limited company
         organized under the laws of England and acting through its branch
         office in Grand Cayman and the Designated Financial Institution (as
         described in Section 3 of Confirmation No. 2).

                  "Dollars", "U.S. $" and "$" mean the lawful currency of the 
         United States of America.

                  "Downgrade Drawing" has the meaning assigned to such term in
         Section 3.6(c) of the Intercreditor Agreement.

                  "Eligible Deposit Account" means either (a) a segregated
         account with an Eligible Institution or (b) a segregated trust account
         with the corporate trust department of a depository institution
         organized under the laws of the

                                 Trust Indenture
   17
                                     - 12 -



         United States of America or any one of the states thereof or the
         District of Columbia (or any U.S. branch of a foreign bank), having
         corporate trust powers and acting as trustee for funds deposited in
         such account, so long as any of the securities of such depository
         institution has a long-term unsecured debt rating from each Rating
         Agency of at least A-3 or its equivalent.

                  "Eligible Institution" means (a) the corporate trust
         department of the Subordination Agent or any Pass Through Trustee, as
         applicable, or (b) a depository institution organized under the laws of
         the United States of America or any one 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 each Rating Agency of at least
         A-3 or its equivalent.

                  "Equipment Notes" means the Equipment Notes, in substantially
         the form set out in Section 2.01 hereof, issued by the Owner Trustee
         and authenticated by the Indenture Trustee pursuant to the terms of
         this Indenture.

                  "Equity Collateral" has the meaning assigned to such
         term in the definition of "Excepted Payments."

                  "Excepted Payments" means (i) indemnity payments and interest
         in respect thereof paid or payable in respect of the Owner Participant,
         the Trust Company, the Owner Trustee or any of their respective
         successors, permitted assigns (and, in the case of a permitted assign
         of the Owner Participant that is a partnership, the partners of such
         partnership), directors, officers, employees, servants, agents,
         subsidiaries, affiliates or shareholders by the Lessee pursuant to
         Section 13 of the Lease and not in support of any payment obligation of
         the Owner Trustee under any Indenture Document, (ii) any proceeds of
         public liability insurance in respect of the Aircraft payable as a
         result of insurance claims paid respecting, or losses suffered by, the
         Trust Company or the Indenture Trustee in its individual capacity or
         the Owner Participant, (iii) any proceeds of insurance maintained with
         respect to the Aircraft by or for the benefit of the Owner Participant
         (whether directly or through the Owner Trustee) and not required under
         Section 12 of the Lease, (iv) payments of Supplemental Rent by the
         Lessee in respect of any amounts payable to the Owner Participant, the
         Trust Company, the Owner Trustee, or any of their respective
         successors, permitted assigns, directors, officers, employees,
         servants, agents, subsidiaries, affiliates or shareholders under
         Section 10 of the Lease or by the Lessee or the Parent Guarantor under
         the Tax Indemnification Agreement, as the

                                 Trust Indenture
   18
                                     - 13 -



         case may be, and not in support of any payment obligation of the Owner
         Trustee under any Indenture Document, (v) Transaction Expenses paid or
         payable by the Lessee or the Parent Guarantor to the Trust Company, the
         Owner Trustee, the Indenture Trustee or the Owner Participant pursuant
         to Section 21 of the Refunding Agreement or the Lease, (vi) any letter
         of credit pursuant to Section 8(l) of the Lease (including, without
         limitation, any replacement letter of credit (the "Equity Collateral"))
         and any payment or proceeds of any such Equity Collateral to the extent
         retained or applied as provided in Section 8(l) of the Lease, and (vii)
         subject to the last sentence of Section 5.10 hereof, any right to
         enforce the payment of any amount described in clauses (i) through (vi)
         above and the proceeds thereof.

                  "Excess Amount" has the meaning specified in Section 
         2.03(b) hereof.

                  "FAA" means the Federal Aviation Administration of the United
         States Department of Transportation or any successor agency.

                  "Final Drawing" means, in respect of a Liquidity Facility, a
         borrowing or drawing of all available and undrawn amounts under such
         Liquidity Facility in accordance with the provisions thereof other than
         a Downgrade Drawing.

                  "First Japanese Lease Assignment" means the Lease Assignment
         [GPA 1989 BN-6] dated as of September 28, 1989 between GPA Offshore and
         the Original Head Lessee.

                  "FUYO" means FUYO General Lease Co., Ltd., a corporation
         organized under the laws of Japan, and its successors and assigns under
         the Japanese Financing Documents.

                  "FUYO Guaranty" means the Guaranty Agreement dated as of
         September 28, 1989 from FUYO for the benefit of the "Lessee" (under and
         as defined in the Japanese Lease Agreement) and such "Lessee's"
         successors and permitted assigns.

                  "Government Obligations" means direct obligations of the
         United States of America that are not callable, redeemable or payable
         prior to maturity, in whole or in part, directly or indirectly, by any
         Person.

                  "GPA Offshore" means Air Tara Caymans II, Limited, a
         Cayman Islands corporation wholly-owned by the Parent

                                 Trust Indenture
   19
                                     - 14 -



         Guarantor, and its successors and permitted assigns under the Japanese
         Financing Documents.

                  "Indenture," "this Indenture," and "the Indenture" mean this
         Second Amended and Restated Indenture, as it may from time to time be
         supplemented or amended as herein provided, including as supplemented
         by any Indenture Supplement pursuant hereto.

                  "Indenture Default" means an Indenture Event of Default or an
         event or condition that, with the giving of notice or the lapse of time
         or both, would become an Indenture Event of Default.

                  "Indenture Documents" means the Refunding Agreement; the Trust
         Agreement (including any Trust Supplements); the Lease (including any
         Lease Supplements); the Equipment Notes; this Indenture (including any
         Indenture Supplements); any Sublease Assignment; any Assigned Sublease;
         the Purchase Agreement, (to the extent assigned to or for the benefit
         of the Owner Trustee); the Purchase Agreement Warranties Assignment;
         the BFE Bill of Sale; the Japanese Lease Agreement; the Japanese Lease
         Supplement; the Supplemental Agreement; the Japanese Lessor's Consent;
         the FUYO Guaranty; the Assumption Agreement; the Confirmation
         Agreement; the JL Security Agreement; the Omnibus Agreement and the
         other Japanese Financing Documents (each to the extent assigned by the
         First Japanese Lease Assignment and the Second Japanese Lease
         Assignment); the First Japanese Lease Assignment; and the Second
         Japanese Lease Assignment.

                  "Indenture Event of Default" has the meaning set forth
         in Section 4.02 hereof.

                  "Indentures" means, collectively, each Trust Indenture and
         Security Agreement listed on Schedule 1 to the Intercreditor Agreement,
         as the same may be amended, supplemented or otherwise modified from
         time to time in accordance with its terms.

                  "Indenture Supplement" or "Trust Indenture Supplement" means a
         supplement to this Indenture, in substantially the form of Exhibit A to
         this Indenture, which shall particularly describe the Aircraft and any
         Replacement Airframe and Replacement Engine included in the property of
         the Owner Trustee covered by this Indenture, including, without
         limitation, Trust Indenture Supplement No. 1 dated December 22, 1989,
         which was recorded as one instrument by the FAA with the Original
         Indenture, Trust Indenture Supplement No. 2 dated October 24, 1991,
         which was recorded as one instrument by the FAA with the First Amended
         and

                                 Trust Indenture
   20
                                     - 15 -



         Restated Indenture, and Trust Indenture Supplement No. 3 dated November
         26, 1996, which is being filed for recordation as one instrument by the
         FAA with this Second Amended and Restated Indenture.

                  "Indenture Trustee Event" means either (i) the Equipment Notes
         shall have become due and payable pursuant to Section 4.04(b) or (c) of
         this Indenture or (ii) the Indenture Trustee has taken action or
         notified the Owner Trustee that it intends to take action to foreclose
         the Lien of this Indenture or otherwise commence the exercise of any
         significant remedy under this Indenture or the Lease.

                  "Interest Drawing" has the meaning assigned to such term in
         Section 3.6(a) of the Intercreditor Agreement.

                  "Investment Earnings" means investment earnings on funds on
         deposit in the Trust Accounts net of losses and investment expenses of
         the Subordination Agent in making such investments.

                  "Japanese Financing Documents" means, collectively, the
         Omnibus Agreement, the Japanese Loan Agreement, the Japanese Security
         Agreement, the Japanese Lease Agreement, the Japanese Lease Supplement,
         the Supplemental Agreement, the Japanese Lessor's Consent, the Deposit
         Agreement, the FUYO Guaranty, the Assumption Agreement, the
         Confirmation Agreement, the JL Security Agreement, the First Japanese
         Lease Assignment, the Second Japanese Lease Assignment and any other
         documents or agreements referred to in the Second Japanese Lease
         Assignment.

                  "Japanese Lease Agreement" means the Lease Agreement dated as
         of September 28, 1989 between the Japanese Lessor, as lessor, and GPA
         Offshore, as lessee, which with the Japanese Lease Supplement, the
         Supplemental Agreement and the First Japanese Lease Assignment attached
         was recorded as one instrument by the FAA on September 29, 1989 and
         assigned Conveyance No. G75383.

                  "Japanese Lease Supplement" means the Lease Supplement
         No. 1 dated September 29, 1989 between the Japanese Lessor
         and GPA Offshore, covering the Aircraft, supplementing the
         Japanese Lease Agreement.

                  "Japanese Lender" means Barclays Bank PLC, a public limited
         company organized under the laws of England and acting through its
         branch office in Tokyo, Japan, and its successors and permitted assigns
         under the Japanese Financing Documents.


                                 Trust Indenture
   21
                                     - 16 -



                  "Japanese Lessor" means FG Vision Leasing Co., Ltd., a
         Japanese limited purpose corporation wholly-owned by FUYO and acting as
         proprietor in a "Tokumei Kumiai" arrangement, and its successors and
         permitted assigns under the Japanese Financing Documents.

                  "Japanese Lessor's Consent" means the Consent of the Japanese
         Lessor, dated as of the Delivery Date, with respect to certain matters
         contained in the Japanese Lease Agreement.

                  "Japanese Loan Agreement" means the Loan Agreement dated as of
         September 28, 1989 between the Japanese Lessor and the Japanese Lender.

                  "Japanese Security Agreement" means the Bank Security
         Agreement dated as of September 28, 1989 between the Japanese Lessor
         and the Japanese Lender.

                  "JL Security Agreement" means the Lessor Security Agreement
         dated as of September 28, 1989 between the Japanese Lessor and GPA
         Offshore.

                  "Lease" means the Original Lease, as the same may be modified,
         supplemented or amended from time to time in accordance with the
         provisions thereof and hereof and of the Refunding Agreement including,
         without limitation, as amended and restated by the First Amended and
         Restated Lease, and as assigned and further amended and restated by
         Assignment and Amendment No. 1 and Sublease Termination Agreement [GPA
         1989 BN-6] dated as of the date hereof and Second Amended and Restated
         Aircraft Lease Agreement [GPA 1989 BN-6] dated as of the date hereof
         and supplemented by Lease Supplement [GPA 1989 BN-6] No. 3 dated
         November 26, 1996, which are being filed for recordation as one
         instrument with the FAA contemporaneously herewith.

                  "Lease Default" means an event or condition that, with the
         giving of notice or the lapse of time or both, would become a Lease
         Event of Default.

                  "Lease Event of Default" means any event or condition defined
         as an "Event of Default" in Section 17 of the Lease.

                  "Lessee" means America West Airlines, Inc., a Delaware
         corporation, in its capacity as lessee under the Second Amended and
         Restated Lease, and its successors, and to the extent permitted by the
         Refunding Agreement, its assigns thereunder.


                                 Trust Indenture
   22
                                     - 17 -



                  "Lien" means any mortgage, chattel mortgage, pledge, lien,
         charge, encumbrance, lease, exercise of rights, security interest,
         lease in the nature of a security interest, statutory right in rem, or
         claim of any kind, including any thereof arising under any conditional
         sale agreement, equipment trust agreement or title retention agreement.

                  "Majority in Interest of Note Holders" means, as of a
         particular date of determination and subject to Section 2.6 of the
         Intercreditor Agreement, the Holders of more than 50% in aggregate
         unpaid Principal Amount of all Equipment Notes outstanding as of such
         date. For purposes of this definition, there shall be excluded any
         Equipment Notes held by the Owner Trustee or the Owner Participant or
         any interests of the Owner Participant therein by reason of subrogation
         pursuant to Section 4.03 of the Indenture (unless all Equipment Notes
         then outstanding shall be held by the Owner Trustee or the Owner
         Participant) or any Equipment Notes held by the Lessee or any Affiliate
         of any thereof.

                  "Make-Whole Amount" means, with respect to any Equipment Note,
         the amount (as determined by an independent investment banker selected
         by Lessee and reasonably acceptable to the Indenture Trustee and the
         Owner Participant) by which (a) the present value of the remaining
         scheduled payments of principal and interest from the redemption date
         to maturity of such Equipment Note computed by discounting each such
         payment on a semiannual basis from its respective Payment Date
         (assuming a 360-day year of twelve 30-day months) using a discount rate
         equal to (i) in the case of the Series A Equipment Notes and Series B
         Equipment Notes, the Treasury Yield and (ii) in the case of the Series
         C Equipment Notes and Series D Equipment Notes, the Treasury Yield plus
         0.75% exceeds (b) the outstanding principal amount of such Equipment
         Note plus accrued interest. For purposes of determining the Make-Whole
         Amount, "Treasury Yield" at the time of determination with respect to
         any Equipment Note means the interest rate (expressed as a semiannual
         equivalent and as a decimal and, in the case of United States Treasury
         bills, converted to a bond equivalent yield) determined to be the per
         annum rate equal to the semiannual yield to maturity for United States
         Treasury securities maturing on the Average Life Date of such Equipment
         Note and trading in the public securities market either as determined
         by interpolation between the most recent weekly average yield to
         maturity for two series of United States Treasury securities, trading
         in the public securities markets, (A) one maturing as close as possible
         to, but earlier than, the Average Life Date of such Equipment Note and
         (B) the other maturing as close as

                                 Trust Indenture
   23
                                     - 18 -



         possible to, but later than, the Average Life Date of such Equipment
         Note, in each case as published in the most recent H.15(519) or, if a
         weekly average yield to maturity for United States Treasury securities
         maturing on the Average Life Date of such Equipment Note is reported on
         the most recent H.15(519), such weekly average yield to maturity as
         published in such H.15(519). "H.15(519)" means the weekly statistical
         release designated as such, or any successor publication, published by
         the Board of Governors of the Federal Reserve System. The date of
         determination of a Make-Whole Amount shall be the third Business Day
         prior to the applicable redemption date and the "most recent H.15(519)"
         means the H.15(519) published prior to the close of business on the
         third Business Day prior to the applicable redemption date.

                  "Non-U.S. Holder" or "Non-U.S. Person" means any Person
         other than a U.S. Person or a U.S. Holder.

                  "Note Holder" or "Holder" means any registered holder from
         time to time of one or more Equipment Notes as reflected in the
         Register maintained by the Registrar.

                  "Officers' Certificate" means a certificate (i) signed by a
         Responsible Officer of the Owner Trustee or the Lessee, as the case may
         be, and (ii) signed by another officer of the Owner Trustee or the
         Lessee, as the case may be, certifying as to the authority and
         signature of such Responsible Officer, that is delivered to the
         Indenture Trustee.

                  "Omnibus Agreement" means the Agreement to Purchase and Lease
         dated as of September 28, 1989 among the Parent Guarantor, GPA
         Offshore, the Japanese Lender and the Japanese Lessor.

                  "Opinion of Counsel" means a written opinion of legal counsel,
         who in the case of legal counsel for the Lessee may be (i) an attorney
         employed by the Lessee who is generally empowered to deliver such
         written opinions or (ii) Latham & Watkins or other counsel designated
         by the Lessee and reasonably satisfactory to the Indenture Trustee or,
         in the case of legal counsel for the Owner Trustee, may be Morris,
         James, Hitchens & Williams or other counsel designated by the Owner
         Trustee and reasonably satisfactory to the Indenture Trustee.

                  "Original Head Lessee" means GPA Leasing USA Sub I, Inc., a
         Connecticut corporation, in its capacity as lessee under the Original
         Lease and the First Amended and Restated Lease.

                                 Trust Indenture
   24
                                     - 19 -




                  "Original Indenture" means the Trust Indenture and Security
         Agreement [GPA 1989 BN-6] dated as of December 15, 1989, as
         supplemented by Trust Indenture Supplement No. 1 dated December 22,
         1989 and as in effect immediately prior to the amendment and
         restatement thereof dated as of October 1, 1991, which were recorded as
         one instrument by the FAA on April 2, 1990 and assigned Conveyance No.
         V79847.

                  "Original Loan Certificates" means the Loan Certificates
         issued under and as defined in the Original Indenture.

                  "Original Sublessee" means America West Airlines, Inc.
         ("AWA"), a Delaware corporation, in its capacity as sublessee under the
         Aircraft Sublease Agreement [GPA 1989 BN-6] dated as of September 21,
         1990 between the Original Head Lessee in its capacity as sublessor
         thereunder and AWA in its capacity as sublessee.

                  "Owner Participant" means ________________________, a Delaware
         corporation, as Owner Participant under the Trust Agreement, and its
         successors and permitted assigns.

                  "Parent Guarantor" means GPA Group plc, a public limited
         company organized and existing under the laws of Ireland.

                  "Pass Through Trust" means each of the four Pass Through
         Trusts established under the relevant Pass Through Trust Agreement.

                  "Pass Through Trust Agreement" means the Pass Through
         Trust Agreements set forth on Schedule II hereto.

                  "Pass Through Trustee" means Fleet National Bank, a national
         banking association, not in its individual capacity but solely as pass
         through trustee under each of the four separate Pass Through Trust
         Agreements.

                  "Past Due Rate" means, with respect to any amount not paid
         when due (whether at stated maturity, by acceleration or otherwise)
         under or in respect of any Equipment Note, a rate of interest per annum
         (computed on the basis of a year of 360 days comprised of twelve 30-day
         months) equal to 1% in excess of the Debt Rate for such Equipment Note.

                  "Payment Date" means each January 2 and July 2, commencing on
         January 2, 1997 (or, if any such day is not a Business Day, the
         immediately succeeding Business Day) until the Equipment Notes have
         been paid in full.


                                 Trust Indenture
   25
                                     - 20 -



                  "Principal Amount" with respect to an Equipment Note means the
         stated original principal amount of such Equipment Note and, with
         respect to all Equipment Notes, means the aggregate stated original
         principal amounts of all Equipment Notes.

                  "Principal Amount Repayment Date" means each Payment Date on
         which any portion of the Principal Amount is due and payable in
         accordance with the Amortization Schedule.

                  "Purchase Agreement Warranties Assignment" means the Purchase 
         Agreement Warranties Assignment [GPA 1989 BN-6] dated the Delivery 
         Date, between the Original Head Lessee and the Owner Trustee.

                  "Rating Agencies" means, collectively, at any time, each
         nationally recognized rating agency which shall have been requested to
         rate the Certificates issued pursuant to the Pass Through Trust
         Agreements and which shall then be rating the Certificates. Initially,
         the Rating Agencies shall consist of Moody's Investors Service, Inc.
         and Standard & Poor's Ratings Group, a division of McGraw-Hill Inc.

                  "Refinancing Transaction" means the transactions contemplated
         by the Refunding Agreement and the other documents entered into on and
         in connection with the Refunding Agreement on the Restatement Date.

                  "Refunding Agreement" means the Refunding Agreement [GPA 1989
         BN-6] dated as of November 20, 1996, among the Lessee, the Original
         Head Lessee, the Parent Guarantor, the Owner Trustee, the Pass Through
         Trustee, the Owner Participant, the Subordination Agent and the
         Indenture
         Trustee.

                  "Register" has the meaning set forth in Section 2.07 hereof.

                  "Registrar" has the meaning set forth in Section 2.07 hereof.

                  "Responsible Officer" means, in the case of the Lessee, the
         president or any other officer with authority of at least a vice
         president or, in the case of the Owner Trustee, an officer of the Owner
         Trustee in its Corporate Trust Administration Department.

                  "Restatement Date" means November 26, 1996 or such other date
         agreed to by the parties to the Refunding Agreement as the date for the
         consummation of the

                                 Trust Indenture
   26
                                     - 21 -



         Refinancing Transaction, as evidenced by the date of the filing with 
         the FAA of Trust Indenture Supplement No. 3.

                  "Second Japanese Lease Assignment" means the Lease
         Assignment No. 2 dated as of December 15, 1989 between the Original 
         Head Lessee and the Owner Trustee, which was recorded by the FAA on 
         April 2, 1990 and assigned Conveyance No. V79846.

                  "Secured Obligations" has the meaning set forth in Section 
         2.06 hereof.

                  "Securities Act" means the Securities Act of 1933, as
         amended.

                  "Series A" or "Series A Equipment Notes" means Equipment Notes
         issued and designated as "Series A" hereunder, in the Principal Amount
         and maturities and bearing interest as specified in Section 2.02 and
         Schedule I hereto under the heading "Series A."

                  "Series B" or "Series B Equipment Notes" means Equipment Notes
         issued and designated as "Series B" hereunder, in the Principal Amount
         and maturities and bearing interest as specified in Section 2.02 and
         Schedule I hereto under the heading "Series B."

                  "Series C" or "Series C Equipment Notes" means Equipment Notes
         issued and designated as "Series C" hereunder, in the Principal Amount
         and maturities and bearing interest as specified in Section 2.02 and
         Schedule I hereto under the heading "Series C."

                  "Series D" or "Series D Equipment Notes" means Equipment Notes
         issued and designated as "Series D" hereunder, in the Principal Amount
         and maturities and bearing interest as specified in Section 2.02 and
         Schedule I hereto under the heading "Series D."

                  "Sublease Assignment" means a sublease assignment by the
         Lessee in favor of the Owner Trustee (including the consent thereto
         given by the sublessee thereunder) with respect to the assignment of a
         Permitted Sublease pursuant to Section 6(a) of the Lease.

                  "Supplemental Agreement" means the Supplemental Agreement
         dated as of September 28, 1989 between the Japanese Lessor and GPA
         Offshore.


                                 Trust Indenture
   27
                                     - 22 -



                  "Transaction Expenses" means the costs, fees, expenses and
         disbursements set forth in Section 21 of the Refunding Agreement.

                  "Trust Accounts" has the meaning assigned to such term in
         Section 2.2(a) of the Intercreditor Agreement.

                  "Trust Company" means Wilmington Trust Company, a Delaware
         banking corporation, in its individual capacity and not as Owner
         Trustee, and its successors under the Trust Agreement, in their
         respective individual capacities and not as Owner Trustee.

                  "Trust Indenture Estate" or "Indenture Estate" means all
         estate, right, title and interest of the Owner Trustee in and to the
         properties, rights and interests covered by the Granting Clause of the
         Indenture, excluding, however, in each case, Excepted Payments.

                  "U.S. Holder" or "U.S. Person" means any Person that is (i) a
         citizen or resident of the United States, as defined in Section 
         7701(a)(9) of the Code (for purposes of this definition, the "United
         States"), (ii) a corporation, partnership or other entity created or
         organized under the laws of the United States or any political
         subdivision thereof or therein or (iii) any estate or trust that is
         subject to United States federal income taxation regardless of the
         source of its income.



                                 Trust Indenture
   28
                                     - 23 -




                                   ARTICLE II

                               THE EQUIPMENT NOTES

                  SECTION 2.01.  Form of Equipment Notes.  The Equipment
Notes shall be substantially in the form set forth below:

           THIS EQUIPMENT NOTE HAS NOT BEEN REGISTERED PURSUANT TO THE
         SECURITIES ACT OF 1933, AS AMENDED (THE "ACT"), OR PURSUANT TO
          THE SECURITIES LAWS OF ANY STATE. ACCORDINGLY, THIS EQUIPMENT
         NOTE MAY NOT BE SOLD UNLESS EITHER REGISTERED UNDER THE ACT AND
              SUCH APPLICABLE STATE LAWS OR AN EXEMPTION FROM SUCH
                           REGISTRATIONS IS AVAILABLE.

                            WILMINGTON TRUST COMPANY,
             AS OWNER TRUSTEE UNDER TRUST AGREEMENT [GPA 1989 BN-6]
                   DATED AS OF DECEMBER 15, 1989, AS AMENDED.

              SERIES [A/B/C/D] NON-RECOURSE EQUIPMENT NOTE DUE [ ]
          ISSUED IN CONNECTION WITH ONE AIRBUS 320-231 AIRCRAFT BEARING
                    UNITED STATES REGISTRATION NUMBER N626AW.


No. ____                                                  Date: [________, 1996]
                                $________________


         DEBT RATE                                               MATURITY DATE

         [________]                                              [_______, ____]

                  WILMINGTON TRUST COMPANY, not in its individual capacity but
solely as Owner Trustee (herein in such capacity called the "Owner Trustee")
under that certain Trust Agreement [GPA 1989 BN-6], dated as of December 15,
1989, as amended, between the Owner Participant named therein and Wilmington
Trust Company (herein as such Trust Agreement may be supplemented or amended
from time to time called the "Trust Agreement"), hereby promises to pay to Fleet
National Bank, as Subordination Agent under the Intercreditor Agreement, or the
registered assignee thereof, the principal sum of $________ (the "Principal
Amount"), together with interest on the Principal Amount remaining unpaid from
time to time (calculated on the basis of a year of 360 days comprised of twelve
30-day months) from the date hereof until paid in full at a rate per annum equal
to the Debt Rate indicated above. The Principal Amount of this Equipment Note
shall be payable in installments on the dates set forth in Schedule I hereto
equal to the corresponding percentage of the Principal Amount of this Equipment
Note set forth in Schedule I hereto. Accrued but unpaid interest shall be due
and payable in semi-

                                 Trust Indenture
   29
                                     - 24 -



annual installments commencing on January 2, 1997, and thereafter on July 2 and
January 2 of each year, to and including ______________, ____.

                  Notwithstanding the foregoing or anything to the contrary
contained herein, (i) the final payment made on this Equipment Note shall be in
an amount sufficient to discharge in full the unpaid Principal Amount and all
accrued and unpaid interest on, and any other amounts due under, this Equipment
Note; and (ii) if any date on which a payment under this Equipment Note becomes
due and payable is not a Business Day, then such payment shall not be made on
such scheduled date but shall be made on the next succeeding Business Day and if
such payment is made on such next succeeding Business Day, no interest shall
accrue on the amount of such payment during such extension.

                  For purposes hereof, the term "Indenture" means the Second
Amended and Restated Trust Indenture and Security Agreement [GPA 1989 BN-6],
dated as of November 26, 1996, between the Owner Trustee and The Chase Manhattan
Bank (formerly known as Chemical Bank, successor by merger to Manufacturers
Hanover Trust Company) (the "Indenture Trustee"), as the same may be amended or
supplemented from time to time. All other capitalized terms used in this
Equipment Note and not defined herein shall have the respective meanings
assigned in the Indenture.

                  This Equipment Note shall bear interest, payable on demand, at
the Past Due Rate (calculated on the basis of a year of 360 days comprised of
twelve 30-day months) on any overdue Principal Amount, any overdue Make-Whole
Amount, if any, and (to the extent permitted by applicable law) any overdue
interest and any other amounts payable hereunder which are overdue, in each case
for the period the same is overdue. Amounts shall be overdue if not paid when
due (whether at stated maturity, by acceleration or otherwise).

                  All payments of all or any portion of the Principal Amount,
interest, Make-Whole Amount, if any, and other amounts, if any, to be made by
the Owner Trustee hereunder and under the Indenture or the Refunding Agreement
shall be payable only from the income and proceeds from the Trust Estate to the
extent included in the Trust Indenture Estate and only to the extent that the
Owner Trustee shall have sufficient income or proceeds from the Trust Estate to
the extent included in the Trust Indenture Estate to enable the Indenture
Trustee to make such payments in accordance with the terms of Section 2.03 and
Article III of the Indenture, and each Holder hereof, by its acceptance of this
Equipment Note, agrees that it will look solely to the income and proceeds from
the Trust Indenture Estate to the extent available for distribution to the
Holder hereof as above provided and that none of the Owner Participant, the
Owner Trustee and the

                                 Trust Indenture
   30
                                     - 25 -



Indenture Trustee is personally liable or liable in any manner, including,
without limitation, extending to any assets other than the Trust Indenture
Estate to the Holder hereof for any amounts payable or any liability under this
Equipment Note or, except as provided in the Indenture or in the Refunding
Agreement, for any liability under the Indenture or the Refunding Agreement;
provided, however, that nothing herein contained shall limit, restrict or impair
any and all rights or remedies of the Indenture Trustee hereunder, subject
always to the terms and provisions of the Indenture.

                  There shall be maintained a Register for the purpose of
registering transfers and exchanges of Equipment Notes at the Corporate Trust
Office of the Indenture Trustee or at the office of any successor in the manner
provided in Section 2.07 of the Indenture.

                  Any payment of any portion of the Principal Amount and
interest and other amounts due hereunder shall be payable in Dollars in
immediately available funds at the Corporate Trust Office of the Indenture
Trustee, or as otherwise provided in the Indenture. Each such payment shall be
made on the date such payment is due and without any presentment or surrender of
this Equipment Note, except that in the case of any final payment with respect
to this Equipment Note, the Equipment Note shall be surrendered promptly
thereafter to the Indenture Trustee for cancellation.

                  The Holder hereof, by its acceptance of this Equipment Note,
agrees that, except as provided in the Indenture, each payment received by it
hereunder shall be applied, first, to the payment of accrued interest on this
Equipment Note (as well as any interest on any overdue Principal Amount, any
overdue Make-Whole Amount, if any, and to the extent permitted by law, any
overdue interest and any other overdue amounts hereunder) to the date of such
payment, second, to the payment of the portion of the Principal Amount of this
Equipment Note then due, third, to the payment of Make-Whole Amount, if any, and
any other amount due hereunder or under the Indenture, and fourth, the balance,
if any, remaining thereafter, to the payment of the portion of the Principal
Amount of this Equipment Note remaining unpaid in the inverse order of its
normal maturity.

                  This Equipment Note is one of the Equipment Notes referred to
in the Indenture which have been or are to be issued by the Owner Trustee
pursuant to the terms of the Indenture. The Trust Indenture Estate is held by
the Indenture Trustee as security, in part, for the Equipment Notes. The
provisions of this Equipment Note are subject to the Indenture. Reference is
hereby made to the Indenture and the Refunding Agreement for a complete
statement of the rights and obligations of the Holder

                                 Trust Indenture
   31
                                     - 26 -



of, and the nature and extent of the security for, this Equipment Note and the
rights and obligations of the Holders of, and the nature and extent of the
security for, any other Equipment Notes executed and delivered under the
Indenture, as well as for a statement of the terms and conditions of the trusts
created by the Indenture, to all of which terms and conditions in the Indenture
and the Refunding Agreement each Holder hereof agrees by its acceptance of this
Equipment Note.

                  As provided in the Indenture and subject to certain
limitations therein set forth, this Equipment Note is exchangeable for a like
aggregate unpaid portion of the Principal Amount of Equipment Notes of different
authorized denominations, as requested by the Holder surrendering the same.

                  Prior to due presentment for registration of transfer of this
Equipment Note, the Owner Trustee and the Indenture Trustee shall treat the
Person in whose name this Equipment Note is registered as the owner hereof for
all purposes whether or not this Equipment Note be overdue, and neither of the
Owner Trustee nor the Indenture Trustee shall be affected by notice to the
contrary.

                  This Equipment Note is subject to redemption as provided in
Sections 2.10 and 2.11 of the Indenture, to purchase by the Owner Participant or
the Owner Trustee as provided in Section 2.12 of the Indenture and to
acceleration by the Indenture Trustee as provided in Section 4.04 of the
Indenture.

                  [The indebtedness evidenced by this Equipment Note is, to the
extent and in the manner provided in the Indenture, subordinate and subject in
right of payment to the prior payment in full of the Secured Obligations (as
defined in the Indenture) in respect of [Series A Equipment Notes](1) [Series B
Equipment Notes](2) [Series C Equipment Notes](3), and this Equipment Note is
issued subject to such provisions. The Note Holder of this Equipment Note, by
accepting the same, (a) agrees to and shall be bound by such provisions, (b)
authorizes and directs the Indenture Trustee on his behalf to take such action
as may be necessary or appropriate to effectuate the subordination as



- --------
(1)        To be inserted in the case of Series B Equipment Notes.

(2)        To be inserted in the case of Series C Equipment Notes.

(3)        To be inserted in the case of Series D Equipment Notes.

                                 Trust Indenture
   32
                                     - 27 -



provided in the Indenture and (c) appoints the Indenture Trustee his attorney-
in-fact for such purpose.](4)

                  Unless the certificate of authentication hereon has been
executed by or on behalf of the Indenture Trustee by manual signature, this
Equipment Note shall not be entitled to any benefit under the Indenture or be
valid or obligatory for any purpose.

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

                                      * * *

- --------
(4)        To be inserted in the case of a Series B, Series C or Series
         D Equipment Note.

                                 Trust Indenture
   33
                                     - 28 -




                  IN WITNESS WHEREOF, the Owner Trustee has caused this
Equipment Note to be executed in its corporate name by its officer thereunto
duly authorized on the date hereof.

                                        WILMINGTON TRUST COMPANY,
                                          not in its individual capacity
                                          but solely as Owner Trustee


                                        By:_______________________________
                                           Name:
                                           Title:


                INDENTURE TRUSTEE'S CERTIFICATE OF AUTHENTICATION


                  This is one of the Equipment Notes referred to in the
within-mentioned Indenture.


                                        THE CHASE MANHATTAN BANK,
                                          as Indenture Trustee


                                        By________________________________
                                          Name:
                                          Title:


                                 Trust Indenture
   34
                                     - 29 -



                                   SCHEDULE I

                          EQUIPMENT NOTES AMORTIZATION

                                                           Percentage of
                           Principal Amount                Principal Amount
                           Repayment Date                  to be Paid
                           ----------------                ----------------


                       [SEE SCHEDULE I TO TRUST INDENTURE
                        WHICH IS INSERTED UPON ISSUANCE]


                                      * * *


                  SECTION 2.02. Issuance and Terms of Equipment Notes. The
Equipment Notes shall be dated the date of issuance thereof, shall be issued in
four separate series consisting of Series A, Series B, Series C and Series D and
in the maturities and principal amounts and shall bear interest as specified in
Schedule I hereto. On the date of the consummation of the Refinancing
Transaction, (i) each Equipment Note shall be issued to the Pass Through
Trustees (or their designee) under the Pass Through Trust Agreements set forth
in Schedule II to be attached hereto in connection therewith and (ii) the
Equipment Trust Certificates issued under the First Amended and Restated Trust
Indenture shall be concurrently redeemed. The Equipment Notes shall be issued in
registered form only. The Equipment Notes shall be issued in denominations of
$1,000 and integral multiples thereof, except that one Equipment Note of each
Series may be in an amount that is not an integral multiple of $1,000.

                  Each Equipment Note shall bear interest at the Debt Rate
(calculated on the basis of a year of 360 days comprised of twelve 30-day
months) on the unpaid Principal Amount thereof from time to time outstanding,
payable in arrears on January 2, 1997, and on each July 2 and January 2
thereafter until maturity.

                  The Principal Amount of each Equipment Note shall be payable
on the dates and in the installments equal to the corresponding percentage of
the Principal Amount as set forth in Schedule I hereto which shall be attached
as Schedule I to the Equipment Notes. Notwithstanding the foregoing, the final
payment made under each Equipment Note shall be in an amount sufficient to
discharge in full the unpaid portion of the Principal Amount and all accrued and
unpaid interest on, and any other amounts due under, such Equipment Note. Each
Equipment Note shall bear interest at the Past Due Rate (calculated on the basis
of a year of 360 days comprised of twelve 30-day months) on

                                 Trust Indenture
   35
                                     - 30 -



any part of the Principal Amount, Make-Whole Amount, if any, and, to the extent
permitted by applicable law, interest and any other amounts payable thereunder
not paid when due for any period during which the same shall be overdue, in each
case for the period the same is overdue. Amounts shall be overdue if not paid
when due (whether at stated maturity, by acceleration or otherwise).
Notwithstanding anything to the contrary contained herein, if any date on which
a payment under any Equipment Note becomes due and payable is not a Business Day
then such payment shall not be made on such scheduled date but shall be made on
the next succeeding Business Day and if such payment is made on such next
succeeding Business Day, no interest shall accrue on the amount of such payment
during such extension.

                  The Owner Trustee agrees to pay to the Indenture Trustee for
distribution in accordance with Section 3.04 hereof (a) any and all indemnity
amounts received by the Owner Trustee which are payable by Lessee to (i) the
Indenture Trustee in its individual capacity, (ii) the Pass Through Trusts,
(iii) the Subordination Agent, (iv) the Liquidity Providers, or (v) the Pass
Through Trustees, in each case pursuant to Sections 10 and 13 of the Lease or
Section 21 of the Refunding Agreement, (b) any and all amounts received by the
Owner Trustee which are payable by Lessee in respect of and equal to the Owner
Trustee's pro rata share (as defined below) of all amounts owed to the Liquidity
Providers by the Subordination Agent under each Liquidity Facility (as
determined by the Subordination Agent in consultation with the Liquidity
Providers and notified to the Indenture Trustee) other than amounts due as (i)
repayments of the principal of advances thereunder, and (ii) interest on
Interest Drawings, Final Drawings and Applied Downgrade Drawings under any
Liquidity Facility except to the extent included in Net Interest and Related
Charges (as defined below), and (c) any and all amounts received by the Owner
Trustee which are payable by Lessee under clause (vii) or (viii) of the
definition of Supplemental Rent. The Indenture Trustee shall have no duty or
obligation to (i) verify or confirm the accuracy of any of the amounts (other
than the portion of the Principal Amount of, and interest on, the Equipment
Notes issued hereunder) paid to it by the Owner Trustee or (ii) determine
whether any amounts are owed by the Owner Trustee under this Section 2.02. As
used in this Section 2.02, "Owner Trustee's pro rata share" means as of any
time:

                  (A) with respect to all amounts other than Net Interest and
         Related Charges, a fraction the numerator of which is the aggregate
         principal balance then outstanding of the Equipment Notes issued
         hereunder and the denominator of which is the aggregate principal
         balance then outstanding of all "Equipment Notes" issued under the
         Indentures, and


                                 Trust Indenture
   36
                                     - 31 -



                  (B) with respect to all Net Interest and Related Charges (x)
         if there exists a Payment Default (as defined below) under any
         Equipment Note a fraction, the numerator of which is the aggregate
         principal balance then outstanding of the Equipment Notes issued
         hereunder and the denominator of which is the aggregate principal
         balance then outstanding of all "Equipment Notes" issued under the
         Indentures under which there exists a Payment Default or (y) at all
         other times, zero;

provided, however, neither the numerator nor the denominator of the fractions in
paragraphs (A) or (B) shall include any "Series D Equipment Notes" issued under
the Indentures. As used in this Section 2.02, "Net Interest and Related Charges"
means (as determined by the Subordination Agent in consultation with the
Liquidity Providers and notified to the Indenture Trustee except that the Past
Due Rate shall be determined by the Indenture Trustee and notified to the
Subordination Agent) the sum of (i) the amount, if any, by which interest
payable to any Liquidity Provider on any Interest Drawing, Final Drawing and/or
Downgrade Drawing (other than a Downgrade Drawing that is not an Applied
Downgrade Drawing (as defined in the Liquidity Facilities)) exceeds the amount
which would be payable if such advances bore interest at the Designated Interest
Rate (as defined below) plus (ii) any amounts payable under Section 3.1, Section
3.2, Section 3.3, Section 3.9 or Section 7.7 of each Liquidity Facility (or
similar provisions of any succeeding liquidity facility) which result from any
Interest Drawing, Final Drawing or Downgrade Drawing. As used in this Section
2.02, "Designated Interest Rate" means the weighted average Past Due Rate (as
defined in the applicable Indentures) in respect of "Series A Equipment Notes",
"Series B Equipment Notes" and "Series C Equipment Notes" issued under the
Indentures, except with respect to that portion of any Final Drawing (or
Downgrade Drawing which becomes a Final Drawing) which remains in a Cash
Collateral Account, Designated Interest Rate means the weighted average
Investment Earnings of funds in the Cash Collateral Accounts. As used in this
Section 2.02, a "Payment Default" when used in connection with an "Equipment
Note" issued under an Indenture means a default in the payment of principal
thereof or interest thereon, other than a default in the payment of principal or
interest on a "Series D Equipment Note" issued under the Indentures which has
not been cured other than solely because of acceleration. For purposes of
Section 3.04(b) hereof, this is the fourth paragraph of Section 2.02.

                  The Equipment Notes shall be executed on behalf of the Owner
Trustee by its President or one of its Vice Presidents, Assistant Vice
Presidents or Assistant Secretaries or other authorized officer. Equipment Notes
bearing the signatures of individuals who were at any time the proper officers
of the Owner

                                 Trust Indenture
   37
                                     - 32 -



Trustee shall bind the Owner Trustee, notwithstanding that such individuals or
any of them have ceased to hold such offices prior to the authentication and
delivery of such Equipment Notes or did not hold such offices at the respective
dates of such Equipment Notes. The Owner Trustee may from time to time execute
and deliver Equipment Notes with respect to the Aircraft to the Indenture
Trustee for authentication upon original issue and such Equipment Notes shall
thereupon be authenticated and delivered by the Indenture Trustee upon the
written request of the Owner Trustee signed by a Vice President or Assistant
Vice President or other authorized officer of the Owner Trustee; provided,
however, that each such request shall specify the aggregate Principal Amount of
all Equipment Notes to be authenticated hereunder on original issue with respect
to the Aircraft. No Equipment Note shall be secured by or be entitled to any
benefit under this Indenture or be valid or obligatory for any purposes, unless
there appears on such Equipment Note a certificate of authentication in the form
provided for herein executed by the Indenture Trustee by the manual signature of
one of its authorized officers and such certificate upon any Equipment Notes
shall be conclusive evidence, and the only evidence, that such Equipment Note
has been duly authenticated and delivered hereunder.

                  SECTION 2.03. Payments from Trust Indenture Estate Only. (a)
Without impairing any of the other rights, powers, remedies, privileges or Liens
of the Note Holders under this Indenture, each Note Holder, by its acceptance of
an Equipment Note, agrees that, except as expressly provided in this Indenture,
the Refunding Agreement or any other Operative Document, (i) the obligation to
make all payments of all or any portion of the Principal Amount of, interest on,
Make-Whole Amount, if any, and all other amounts due with respect to the
Equipment Notes, and the performance by the Owner Trustee of every obligation or
covenant contained in this Indenture and in the Refunding Agreement or any of
the other Operative Documents, shall be payable only from the income and
proceeds from the Trust Estate to the extent included in the Trust Indenture
Estate and only to the extent that the Owner Trustee shall have sufficient
income or proceeds from the Trust Estate to the extent included in the Trust
Indenture Estate to enable the Indenture Trustee to make such payments in
accordance with the terms of Article III hereof, and all of the statements,
representations, covenants and agreements made by the Owner Trustee (when made
in such capacity) contained in this Indenture and any other Operative Document
other than the Trust Agreement, unless expressly otherwise stated, are made and
intended only for the purpose of binding the Trust Estate and establishing the
existence of rights and remedies which can be exercised and enforced against the
Trust Estate; therefore, anything contained in this Indenture or such other
agreements to the contrary notwithstanding (except for any

                                 Trust Indenture
   38
                                     - 33 -



express provisions or representations that the Trust Company is responsible for,
or is making, for which there would be personal liability of the Trust Company),
no recourse shall be had with respect to this Indenture or such other agreements
against the Trust Company or against any institution or Person which becomes a
successor trustee or co-trustee or any officer, director, trustee, servant or
direct or indirect parent or controlling Person or Persons of any of them, and
(ii) none of the Trust Company, the Owner Participant, the Indenture Trustee and
any officer, director, trustee, servant, employee, agent or direct or indirect
parent or controlling Person or Persons of any of them shall have any personal
liability for any amounts payable, or other obligation owed, hereunder, under
the Refunding Agreement or any of the other Operative Documents or under the
Equipment Notes except as expressly provided herein (in the case of the Owner
Trustee and the Indenture Trustee) or therein; provided, however, nothing
contained in this Section 2.03(a) shall be construed to limit the exercise and
enforcement in accordance with the terms of this Indenture or such other
agreements of rights and remedies against the Trust Indenture Estate.

                  (b) If (i) all or any part of the Trust Estate becomes the
property of, or the Owner Trustee or Owner Participant becomes, a debtor subject
to the reorganization provisions of the Bankruptcy Code, (ii) pursuant to such
reorganization provisions, including Section 1111(b) of the Bankruptcy Code, the
Trust Company, the Owner Trustee or the Owner Participant is required, by reason
of the Trust Company, the Owner Trustee or the Owner Participant being held to
have recourse liability to any Note Holder or the Indenture Trustee, directly or
indirectly (other than the recourse liability of the Trust Company, the Owner
Trustee or the Owner Participant under the Operative Documents), to make payment
on account of any amount payable as Principal Amount, Make-Whole Amount, if any,
interest or other amounts on the Equipment Notes or under this Indenture and
(iii) any Note Holder or the Indenture Trustee actually receives any Excess
Amount (as hereinafter defined) which reflects any payment by the Trust Company,
the Owner Trustee or the Owner Participant on account of clause (ii) above
(other than aforesaid), then such Note Holder or the Indenture Trustee, as the
case may be, shall promptly refund to the Trust Company, the Owner Trustee or
the Owner Participant (whichever shall have made such payment) such Excess
Amount.

                  For purposes of this Section 2.03(b), "Excess Amount" means
the amount by which such payment exceeds the amount that would have been
received by a Note Holder or the Indenture Trustee if the Trust Company, the
Owner Trustee or the Owner Participant had not become subject to the recourse
liability referred to in clause (ii) above. Nothing contained in this Section 
2.03(b) shall prevent a Note Holder or the Indenture

                                 Trust Indenture
   39
                                     - 34 -



Trustee from enforcing any personal recourse obligation (and retaining the
proceeds thereof) of the Trust Company, the Owner Trustee or the Owner
Participant under the Refunding Agreement, this Indenture (and any exhibits or
annexes hereto or thereto) or any other Operative Document.

                  SECTION 2.04. Method of Payment. (a) The Principal Amount of,
interest on, Make-Whole Amount, if any, and other amounts due under each
Equipment Note or hereunder will be payable in Dollars by wire transfer of
immediately available funds not later than 12:00 noon, New York City time, on
the due date of payment to the Indenture Trustee at the Corporate Trust Office
for distribution among the Note Holders in the manner provided herein. After
transferring (or causing the transfer of) the above amounts to the Indenture
Trustee, the Owner Trustee shall not have any responsibility for the
distribution of such payment to any Note Holder. Notwithstanding the foregoing
or any provision in any Equipment Note to the contrary, the Indenture Trustee
will use reasonable efforts to pay or cause to be paid, if so directed in
writing by any Note Holder (with a copy to the Owner Trustee), all amounts paid
by the Owner Trustee hereunder and under such Holder's Equipment Note or
Equipment Notes to such Holder or a nominee therefor (including all amounts
distributed pursuant to Article III of this Indenture) by transferring, or
causing to be transferred, by wire transfer of immediately available funds in
Dollars, prior to 2:00 p.m., New York City time, on the due date of payment, to
an account maintained by such Holder with a bank located in the continental
United States the amount to be distributed to such Holder, for credit to the
account of such Holder maintained at such bank. If the Indenture Trustee shall
fail to make any such payment as provided in the immediately preceding sentence
after its receipt of funds at the place and prior to the time specified above,
the Indenture Trustee, in its individual capacity and not as trustee and without
indemnification or right of reimbursement under any Operative Document, agrees
to compensate such Holders for loss of use of funds in accordance with industry
standards for this type of transaction until such payment is made and the
Indenture Trustee shall be entitled to any interest earned on such funds until
such payment is made. Any payment made hereunder shall be made free and clear of
and without reduction for or on account of all wire and like charges and without
any presentment or surrender of any Equipment Note, except that, in the case of
the final payment in respect of any Equipment Note, such Equipment Note shall be
surrendered to the Indenture Trustee for cancellation promptly after such
payment. Notwithstanding any other provision of this Indenture to the contrary,
the Indenture Trustee shall not be required to make, or cause to be made, wire
transfers as aforesaid prior to the first Business Day on which it is
practicable for the Indenture Trustee to do so if such funds were received after
12:00 noon, New York City time, at the

                                 Trust Indenture
   40
                                     - 35 -



place of payment. Prior to the due presentment for registration of transfer of
any Equipment Note, the Owner Trustee and the Indenture Trustee shall deem and
treat the Person in whose name any Equipment Note is registered on the Register
as the absolute owner and Holder of such Equipment Note for the purpose of
receiving payment of all amounts payable with respect to such Equipment Note and
for all other purposes, and neither the Owner Trustee nor the Indenture Trustee
shall be affected by any notice to the contrary, unless and until such change is
reflected in the Register. So long as any signatory to the Refunding Agreement
or nominee thereof shall be a registered Note Holder, all payments to it shall
be made to the account of such Note Holder specified in Schedule III thereto and
otherwise in the manner provided in or pursuant to the Refunding Agreement
unless it shall have specified some other account or manner of payment by notice
to the Indenture Trustee consistent with this Section 2.04.

                  (b) The Indenture Trustee, as agent for the Owner Trustee,
shall exclude and withhold at the appropriate rate from each payment of
Principal Amount of, interest on, Make-Whole Amount, if any, and other amounts
due hereunder or under each Equipment Note (and such exclusion and withholding
shall constitute payment in respect of such Equipment Note) any and all United
States withholding Taxes applicable thereto as required by law. The Indenture
Trustee agrees to act as such withholding agent and, in connection therewith,
whenever any present or future United States Taxes or similar charges are
required to be withheld with respect to any amounts payable hereunder or in
respect of the Equipment Notes, to withhold such amounts (and such withholding
shall constitute payment in respect of such Equipment Note) and timely pay the
same to the appropriate authority in the name of and on behalf of the Note
Holders, that it will file any necessary United States withholding tax returns
or statements when due, and that as promptly as possible after the payment
thereof it will deliver to each Note Holder (with a copy to the Owner Trustee
and the Lessee) appropriate receipts showing the payment thereof, together with
such additional documentary evidence as any such Note Holder, the Owner
Participant and the Owner Trustee may reasonably request from time to time.

                  If a Note Holder which is a Non-U.S. Person has furnished to
the Indenture Trustee a properly completed and currently effective U.S. Internal
Revenue Service Form 1001 or W-8 (or such successor form or forms as may be
required by the United States Treasury Department) during the calendar year in
which the payment hereunder or under the Equipment Note(s) held by such Holder
is made (but prior to the making of such payment) or in either of the two
preceding calendar years, and has not notified the Indenture Trustee of the
withdrawal or inaccuracy of such form prior to the date of such payment (and the
Indenture

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                                     - 36 -



Trustee has no reason to know that any information set forth in such form is
inaccurate), the Indenture Trustee shall withhold only the amount, if any,
required by law (after taking into account any applicable exemptions claimed by
the Note Holder) to be withheld from payments hereunder or under the Equipment
Notes held by such Holder in respect of United States federal income Tax (and
such withholding shall constitute payment in respect of such Equipment Note). If
a Note Holder (x) which is a Non-U.S. Person has furnished to the Indenture
Trustee a properly completed and currently effective U.S. Internal Revenue
Service Form 4224 in duplicate (or such successor certificate, form or forms as
may be required by the United States Treasury Department as necessary in order
to avoid withholding of United States federal income tax), during the calendar
year in which the payment is made (but prior to the making of such payment), and
has not notified the Indenture Trustee of the withdrawal or inaccuracy of such
certificate or form prior to the date of such payment (and the Indenture Trustee
has no reason to know that any information set forth in such form is inaccurate)
or (y) which is a U.S. Person has furnished to the Indenture Trustee a properly
completed and currently effective U.S. Internal Revenue Service Form W-9, if
applicable, prior to a payment hereunder or under the Equipment Notes held by
such Holder, no amount shall be withheld from payments in respect of United
States federal income tax. If any Note Holder has notified the Indenture Trustee
that any of the foregoing forms or certificates is withdrawn or inaccurate, or
if such Holder has not filed a form claiming an exemption from United States
withholding Tax or if the Code or the regulations thereunder or the
administrative interpretation thereof are at any time after the date hereof
amended to require such withholding of United States federal income taxes from
payments under the Equipment Notes held by such Holder, the Indenture Trustee
agrees to withhold from each payment due to the relevant Note Holder withholding
Taxes at the appropriate rate under law (and such withholding shall constitute
payment in respect of such Equipment Notes) and will, on a timely basis as more
fully provided above, deposit such amounts with an authorized depository and
make such returns, statements, receipts and other documentary evidence in
connection therewith as required by applicable law.

                  None of the Owner Trustee, the Owner Participant or the Lessee
shall have any liability for the failure of the Indenture Trustee to withhold
taxes in the manner provided for herein or for any false, inaccurate or untrue
evidence provided by a Holder hereunder.

                  SECTION 2.05. Application of Payments. In the case of each
Equipment Note, each payment of Principal Amount, Make-Whole Amount, if any, and
interest or other amounts due thereon shall be applied:

                                 Trust Indenture
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                                     - 37 -




                  First: to the payment of accrued interest on such Equipment
         Note (as well as any interest on any overdue Principal Amount, any
         overdue Make-Whole Amount, if any, and, to the extent permitted by law,
         any overdue interest and any other overdue amounts thereunder) to the
         date of such payment;

                  Second:  to the payment of the Principal Amount of such
         Equipment Note (or a portion thereof) then due thereunder;

                  Third:  to the payment of Make-Whole Amount, if any, and any 
         other amount due hereunder or under such Equipment Note; and

                  Fourth: the balance, if any, remaining thereafter, to the
         payment of the Principal Amount of such Equipment Note remaining unpaid
         (provided that such Equipment Note shall not be subject to redemption
         except as provided in Sections 2.10 and 2.11 hereof).

The amounts paid pursuant to clause "Fourth" above shall be applied to the
installments of Principal Amount of such Equipment Note in the inverse order of
their normal maturity.

                  SECTION 2.06. Termination of Interest in Trust Indenture
Estate. A Note Holder shall not, as such, have any further interest in, or other
right with respect to, the Trust Indenture Estate when the Principal Amount of,
Make-Whole Amount, if any, and interest on and other amounts due under all
Equipment Notes held by such Note Holder and all other sums then payable to such
Note Holder hereunder and under the Lease and the Refunding Agreement by the
Lessee, the Owner Participant and the Owner Trustee (collectively, the "Secured
Obligations") shall have been paid in full.

                  SECTION 2.07. Registration, Transfer and Exchange of Equipment
Notes. The Indenture Trustee shall keep a register (the "Register") in which the
Indenture Trustee shall provide for the registration of Equipment Notes and the
registration of transfers of Equipment Notes. No such transfer shall be given
effect unless and until registration hereunder shall have occurred. The Register
shall be kept at the Corporate Trust Office of the Indenture Trustee. The
Indenture Trustee is hereby appointed "Registrar" for the purpose of registering
Equipment Notes and transfers of Equipment Notes as herein provided. A Holder of
any Equipment Note intending to exchange such Equipment Note shall surrender
such Equipment Note to the Indenture Trustee at the Corporate Trust Office,
together with a written request from the registered Holder thereof for the
issuance of a new Equipment Note, specifying, in the case of a surrender for
transfer, the name and address of the new Holder or Holders.

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                                     - 38 -



Upon surrender for registration of transfer of any Equipment Note, the Owner
Trustee shall execute, and the Indenture Trustee shall authenticate and deliver,
in the name of the designated transferee or transferees, one or more new
Equipment Notes of a like aggregate unpaid portion of the Principal Amount and
of the same series. At the option of the Note Holder, Equipment Notes may be
exchanged for other Equipment Notes of any authorized denominations of a like
aggregate unpaid portion of the Principal Amount, upon surrender of the
Equipment Notes to be exchanged to the Indenture Trustee at the Corporate Trust
Office. Whenever any Equipment Notes are so surrendered for exchange, the Owner
Trustee shall execute, and the Indenture Trustee shall authenticate and deliver,
the Equipment Notes which the Note Holder making the exchange is entitled to
receive. All Equipment Notes issued upon any registration of transfer or
exchange of Equipment Notes (whether under this Section 2.07 or under Section 
2.08 hereof or otherwise under this Indenture) shall be the valid obligations of
the Owner Trustee evidencing the same respective obligations, and entitled to
the same security and benefits under this Indenture, as the Equipment Notes
surrendered upon such registration of transfer or exchange. Every Equipment Note
presented or surrendered for registration of transfer or exchange shall (if so
required by the Indenture Trustee) be duly endorsed, or be accompanied by a
written instrument of transfer in form satisfactory to the Indenture Trustee
duly executed by the Note Holder or such Holder's attorney duly authorized in
writing, and the Indenture Trustee shall require evidence satisfactory to it as
to the compliance of any such transfer with the Securities Act and the
securities laws of any applicable state. The Indenture Trustee shall make a
notation on each new Equipment Note of the amount of all payments of Principal
Amount previously made on the old Equipment Note or Equipment Notes with respect
to which such new Equipment Note is issued and the date to which interest on
such old Equipment Note or Equipment Notes has been paid. Interest shall be
deemed to have been paid on such new Equipment Note to the date on which
interest shall have been paid on such old Equipment Note, and all payments of
the Principal Amount marked on such new Equipment Note, as provided above, shall
be deemed to have been made thereon. Neither the Indenture Trustee nor the Owner
Trustee shall be required to exchange any surrendered Equipment Notes as
provided above during the ten-day period preceding the Payment Date. The
Indenture Trustee will promptly notify the Owner Trustee, the Owner Participant
and Lessee of each registration of a transfer of an Equipment Note. Any such
transferee of an Equipment Note, by its acceptance of an Equipment Note, agrees
to the provisions of the Refunding Agreement applicable to Note Holders, and
shall be deemed to have represented and warranted to the parties to the
Refunding Agreement as to the matters represented and warranted by the
Subordination Agent in its capacity as the initial Holder of the Equipment
Notes. Subject to compliance by the Note Holder and

                                 Trust Indenture
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                                     - 39 -



its transferee (if any) of the requirements set forth in this Section 2.07, the
Indenture Trustee and the Owner Trustee shall use all reasonable efforts to
issue new Equipment Notes upon transfer or exchange within 10 Business Days of
the date an Equipment Note is surrendered for transfer or exchange.

                  SECTION 2.08. Mutilated, Destroyed, Lost or Stolen Equipment
Notes. If any Equipment Note shall become mutilated, destroyed, lost or stolen,
the Owner Trustee shall, upon the written request of the Holder of such
Equipment Note, execute and the Indenture Trustee shall authenticate and deliver
in replacement thereof a new Equipment Note, payable in the same Principal
Amount dated the same date and captioned as originally issued. If the Equipment
Note being replaced has become mutilated, such Equipment Note shall be
surrendered to the Indenture Trustee and a copy thereof shall be furnished to
the Owner Trustee. If the Equipment Note being replaced has been destroyed, lost
or stolen, the Holder of such Equipment Note shall furnish to the Lessee, the
Owner Trustee, the Owner Participant and the Indenture Trustee such security or
indemnity as may be reasonably required by them to save the Lessee, the Owner
Trustee, the Owner Participant and the Indenture Trustee harmless and evidence
satisfactory to the Lessee, the Owner Trustee, the Owner Participant and the
Indenture Trustee of the destruction, loss or theft of such Equipment Note and
of the ownership thereof. If a bank or trust company with a net worth of
$200,000,000 or more is the Holder of any such destroyed, lost or stolen
Equipment Note, then the written indemnity of such Person, signed by an
authorized officer thereof, in favor of, delivered to and in form reasonably
satisfactory to the Lessee, the Owner Participant, the Owner Trustee and the
Indenture Trustee shall be accepted as satisfactory indemnity and security and
no further indemnity or security shall be required as a condition to the
execution and delivery of such new Equipment Note.

                  SECTION 2.09. Payment of Expenses on Transfer; Cancellation.
(a) No service charge shall be made to a Note Holder for any registration of
transfer or exchange of Equipment Notes, but the Indenture Trustee, as
Registrar, may require payment of a sum sufficient to cover any tax or other
governmental charge that may be imposed in connection with any registration of
transfer or exchange of Equipment Notes; provided, however, that none of the
Lessee, the Owner Trustee, the Indenture Trustee or the Owner Participant shall
bear costs of registration, transfer or exchange in connection with the
consummation of the Refinancing Transaction.

                  (b)  The Indenture Trustee shall cancel all Equipment
Notes surrendered for replacement, redemption, transfer,

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                                     - 40 -



exchange, payment or cancellation and shall destroy the canceled Equipment
Notes.

                  SECTION 2.10. Mandatory Redemptions of Equipment Notes. The
Equipment Notes are subject to redemption as provided in this Section 2.10 and
Section 2.11 and purchase as provided in Section 2.12. On the date on which
Lessee is required pursuant to Section 11(a) of the Lease to make payment for an
Event of Loss with respect to the Aircraft, all of the Equipment Notes shall be
redeemed in whole at a redemption price equal to 100% of the unpaid Principal
Amount thereof, together with all accrued interest thereon to, but not
including, the date of redemption and all other amounts payable hereunder or
under the Refunding Agreement to the Note Holders but without Make-Whole Amount,
all in the order of priority specified in Section 3.02 hereof.

                  SECTION 2.11. Redemptions; Notice of Redemption. (a) Neither
any redemption of any Equipment Note nor any purchase by the Owner Trustee of
any Equipment Note may be made except to the extent and in the manner expressly
permitted by this Indenture. No purchase of any Equipment Note may be made by
the Indenture Trustee.

                  (b) Notice of redemption or purchase with respect to the
Equipment Notes shall be given by the Indenture Trustee by first-class mail,
postage prepaid, mailed not less than 15 nor more than 60 days prior to the
applicable redemption date, to each Note Holder of such Equipment Notes to be
redeemed or purchased, at such Note Holder's address appearing in the Register.
All notices of redemption or purchase shall state: (1) the redemption date, (2)
the applicable basis for determining the redemption price, (3) that on the
redemption date, the redemption price will become due and payable upon each such
Equipment Note, and that interest on such Equipment Notes shall cease to accrue
on and after such redemption date, and (4) the place or places where such
Equipment Notes are to be surrendered for payment of the redemption price.

                  (c) On or before the redemption date, the Owner Trustee (or
any Person on behalf of the Owner Trustee) shall, to the extent an amount equal
to the redemption price for the Equipment Notes to be redeemed or purchased on
the redemption date shall not then be held in the Trust Indenture Estate,
deposit or cause to be deposited with the Indenture Trustee by 12:00 noon, New
York City time, on the redemption date in immediately available funds the
redemption price of the Equipment Notes to be redeemed or purchased.

                  (d) Notice of redemption or purchase having been given as
aforesaid, the Equipment Notes to be redeemed or purchased shall, on the
redemption date, become due and payable at the

                                 Trust Indenture
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                                     - 41 -



Corporate Trust Office of the Indenture Trustee, and from and after such
redemption date (unless there shall be a default in the payment of the
redemption price) any such Equipment Notes then outstanding shall cease to bear
interest. Upon surrender of any such Equipment Note for redemption or purchase
in accordance with said notice, such Equipment Note shall be redeemed at the
redemption price. If any Equipment Note called for redemption or purchase shall
not be so paid upon surrender thereof for redemption, the principal amount
thereof shall, until paid, continue to bear interest from the applicable
redemption date at the interest rate in effect for such Equipment Note as of
such redemption date.

                  SECTION 2.12. Option to Purchase Equipment Notes. Either the
Owner Trustee or the Owner Participant may, upon the events and subject to the
terms and conditions and for the price set forth in this Section 2.12, purchase
all but not less than all of the Equipment Notes outstanding hereunder, and each
Note Holder agrees that it will, upon such events and subject to such terms and
conditions and upon receipt of such price, sell, assign, transfer and convey to
such purchaser or its nominee (without recourse or warranty of any kind except
as to its title to the Equipment Notes and except against Liens on such
Equipment Notes arising by, through or under such Holder), all of the right,
title and interest of such Note Holder in and to the Trust Indenture Estate,
this Indenture and the Equipment Notes held by it, and such purchaser or its
nominee shall assume all of such Holder's obligations under the Refunding
Agreement and hereunder.

                  Such option to purchase the Equipment Notes may be exercised
by the Owner Trustee or the Owner Participant upon any of the following events,
and, in any such event, the purchase price thereof shall equal for each
Equipment Note the aggregate unpaid Principal Amount thereof, plus accrued and
unpaid interest thereon to, but not including, the date of purchase and all
other amounts (other than the Make-Whole Amount, except as provided in the next
sentence) then payable hereunder or under the Refunding Agreement to the Holder
thereof. Such option to purchase the Equipment Notes may be exercised: (i) upon
an Indenture Trustee Event or (ii) in the event there shall have occurred and be
continuing a Lease Event of Default, provided that if such option is exercised
pursuant to this clause (ii) at a time when there shall have occurred and be
continuing for less than 120 days a Lease Event of Default (and there is no
Indenture Trustee Event), the purchase price thereof shall equal the price
provided in the preceding sentence plus the Make-Whole Amount, if any; provided
further, that under no circumstances shall the Make-Whole Amount be payable by
the Lessee.

                  Such option to purchase the Equipment Notes may be exercised
by the Owner Trustee or the Owner Participant giving

                                 Trust Indenture
   47
                                     - 42 -



written notice of its election of such option to the Indenture Trustee, which
notice shall specify a date for such purchase not more than 30 days or less than
15 days after the date of such notice. The Indenture Trustee shall not exercise
any of the remedies hereunder or, without the consent of the Owner Trustee or
the Owner Participant, under the Lease, during the period from the time that a
notice of exercise by the Owner Participant of such option to purchase becomes
irrevocable until the date on which such purchase is required to occur pursuant
to the terms of the preceding sentence. Such election to purchase the Equipment
Notes shall become irrevocable upon the fifteenth day preceding the date
specified in the written notice described in the first sentence of this
paragraph.

                  If the Owner Trustee or the Owner Participant on or before the
date of such purchase shall so request, the Note Holders will comply with all
the provisions of Section 2.07 to enable new Equipment Notes to be issued to the
Owner Trustee or the Owner Participant or its nominee in such denominations as
the Owner Trustee or the Owner Participant shall request. All taxes and charges
required pursuant to Section 2.09 in connection with the issuance of such new
Equipment Note shall be borne by the Owner Participant.

                  SECTION 2.13. Subordination. (a) The Owner Trustee and, by
acceptance of its Equipment Notes of any Series, each Note Holder of such
Series, hereby agree that no payment or distribution shall be made on or in
respect of the Secured Obligations owed to such Note Holder of such Series,
including any payment or distribution of cash, property or securities after the
commencement of a proceeding of the type referred to in Section 4.02(g), (h) or
(i) hereof, except as expressly provided in Articles II and III hereof.

                  (b) By the acceptance of its Equipment Notes of any Series
(other than Series A), each Note Holder of such Series agrees that in the event
that such Note Holder, in its capacity as a Note Holder, shall receive any
payment or distribution on any Secured Obligations in respect of such Series
which it is not entitled to receive under this Section 2.13 or Article III
hereof, it will hold any amount so received in trust for the Senior Holder or
Senior Holders (as defined in Section 2.13(c) hereof) and will forthwith turn
over such payment to the Indenture Trustee in the form received to be applied as
provided in Articles II and III hereof.

                  (c) As used in this Section 2.13, the term "Senior Holder" or
"Senior Holders" shall mean (i) the Note Holders of Series A until the Secured
Obligations in respect of Series A Equipment Notes have been paid in full, (ii)
after the Secured Obligations in respect of Series A Equipment Notes have been
paid

                                 Trust Indenture
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                                     - 43 -



in full, the Note Holders of Series B until the Secured Obligations in respect
of Series B Equipment Notes have been paid in full and (iii) after the Secured
Obligations in respect of Series B Equipment Notes have been paid in full, the
Note Holders of Series C until the Secured Obligations in respect of Series C
Equipment Notes have been paid in full.


                                   ARTICLE III

                    RECEIPT, DISTRIBUTION AND APPLICATION OF
                     INCOME FROM THE TRUST INDENTURE ESTATE

                  SECTION 3.01. Certain Rent Distributions. Except as otherwise
provided in Sections 3.02 or 3.03 hereof, each installment of Basic Rent, any
payment of Supplemental Rent, any payment received by the Indenture Trustee as
contemplated by the first sentence of Section 4.03 hereof, and any payment
received by the Indenture Trustee pursuant to any Sublease Assignment as rent
under any Assigned Sublease shall be promptly distributed in the following order
of priority:

                  first, (i) so much of such installment or payment as shall be
         required to pay in full the aggregate amount of the payment or payments
         of Principal Amount, and interest and other amounts (as well as any
         interest on overdue Principal Amount, and to the extent permitted by
         applicable law, on any overdue interest and any other overdue amounts)
         then due to the Note Holders under all Series A Equipment Notes shall
         be distributed to the Note Holders of Series A ratably, without
         priority of one over the other, in the proportion that the amount of
         such payment or payments then due under each Series A Equipment Note
         bears to the aggregate amount of the payments then due under all Series
         A Equipment Notes;

             (ii) after giving effect to clause (i) above, so much of such
         installment or payment remaining as shall be required to pay in full
         the aggregate amount of the payment or payments of Principal Amount and
         interest and other amounts (as well as any interest on any overdue
         Principal Amount and, to the extent permitted by applicable law, on any
         overdue interest and any other overdue amounts) then due to the Note
         Holders under all Series B Equipment Notes shall be distributed to the
         Note Holders of Series B ratably, without priority of one over the
         other, in the proportion that the amount of such payment or payments
         then due under each Series B Equipment Note bears to the aggregate
         amount of the payments then due under all Series B Equipment Notes;

            (iii)  after giving effect to clause (ii) above, so much
         of such installment or payment remaining as shall be

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                                     - 44 -



         required to pay in full the aggregate amount of the payment or payments
         of Principal Amount and interest and other amounts (as well as any
         interest on any overdue Principal Amount and, to the extent permitted
         by applicable law, on any overdue interest and any other overdue
         amounts) then due to the Note Holders under all Series C Equipment
         Notes shall be distributed to the Note Holders of Series C ratably,
         without priority of one over the other, in the proportion that the
         amount of such payment or payments then due under each Series C
         Equipment Note bears to the aggregate amount of the payments then due
         under all Series C Equipment Notes; and

             (iv) after giving effect to clause (iii) above, so much of such
         installment or payment remaining as shall be required to pay in full
         the aggregate amount of the payment or payments of Principal Amount and
         interest and other amounts (as well as any interest on any overdue
         Principal Amount and, to the extent permitted by applicable law, on any
         overdue interest and any other overdue amounts) then due to the Note
         Holders under all Series D Equipment Notes shall be distributed to the
         Note Holders of Series D ratably, without priority of one over the
         other, in the proportion that the amount of such payment or payments
         then due under each Series D Equipment Note bears to the aggregate
         amount of the payments then due under all Series D Equipment Notes; and

                  second, the balance, if any, of such installment or payment
         remaining thereafter shall be distributed to the Owner Trustee for
         distribution pursuant to the Trust Agreement; provided, however, that
         if an Indenture Default shall have occurred and be continuing, then
         such balance shall not be distributed as provided in this clause
         "second" but shall be held by the Indenture Trustee as part of the
         Trust Indenture Estate and invested in accordance with Section 3.07
         hereof until whichever of the following shall first occur: (i) all
         Indenture Defaults shall have been cured or waived, in which event such
         balance shall be distributed as provided in this clause "second", or
         (ii) Section 3.03 hereof shall be applicable, in which event such
         balance shall be distributed in accordance with the provisions of said
         Section 3.03, or (iii) the 180th day after receipt of such payment, in
         which event such balance shall be distributed as provided in this
         clause "second" without reference to this proviso.

                  SECTION 3.02.  Event of Loss and Replacement.  (a) Any
payment received by the Indenture Trustee with respect to the
Airframe or the Airframe and one or both Engines as the result of
an Event of Loss thereto shall be applied to the redemption of

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   50
                                     - 45 -



the Equipment Notes and to all other amounts payable hereunder by applying such
funds in the following order of priority:

                  first, to reimburse the Indenture Trustee for any reasonable
         out-of-pocket costs or expenses incurred in connection with such Event
         of Loss,

                  second, to pay in full the aggregate amount of the payment or
         payments of unpaid Principal Amount, and unpaid interest and other
         amounts (as well as any interest on overdue Principal Amount, and to
         the extent permitted by applicable law, on any overdue interest and any
         other overdue amounts) then due to the Note Holders under all Equipment
         Notes, all in the order of priority specified in clause "first" of
         Section 3.01 hereof, and

                  third, if and to the extent required to be paid to the Lessee
         (or if directed by the Lessee, any Permitted Sublessee) in
         reimbursement of payment of Stipulated Loss Value pursuant to Section 
         11(d) of the Lease, to the Lessee (or if directed by the Lessee, any
         Permitted Sublessee), and otherwise as provided in clause "fourth" of
         Section 3.03 hereof;

provided that, if a Replacement Airframe or a Replacement Airframe and one or
more Replacement Engines are to be substituted for the Airframe or the Airframe
and one or both Engines subject to such Event of Loss as provided in Section 11
of the Lease and Section 5.06 hereof, any proceeds which result from such Event
of Loss and are paid to the Indenture Trustee shall be held by the Indenture
Trustee as part of the Trust Indenture Estate as security for the obligations of
the Lessee under the Operative Documents and invested in accordance with the
terms of Section 3.07 hereof and, unless theretofore applied in accordance with
the provisions of the Lease and this Indenture, such proceeds shall, to the
extent payable to the Lessee under the Lease, be released to the Lessee (or if
directed by the Lessee, any Permitted Sublessee) upon or in connection with the
replacement thereof as provided in such Sections.

                  (b) Any amounts received directly or indirectly from any
governmental authority or insurer or other party pursuant to any provision of
Section 11 or 12 of the Lease (other than as the result of an Event of Loss with
respect to the Airframe or the Airframe and one or both Engines) shall be
applied as provided in the applicable provisions of the Lease; provided,
however, that to the extent that any portion of such amounts held for account of
the Lessee are not at the time required to be paid to the Lessee (or any
Permitted Sublessee) pursuant to the applicable provisions of Section 11 or 12
of the Lease, shall be held by the Indenture Trustee as security for the
obligations of the Lessee

                                 Trust Indenture
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                                     - 46 -



under the Operative Documents and shall be invested in accordance with the terms
of Section 3.07 hereof and at such time as the conditions specified in the Lease
for payment of such amounts to the Lessee shall be fulfilled, such portion, and
the net proceeds of any investment thereof, shall, unless theretofore applied in
accordance with the provisions of the Lease and this Indenture, be paid to the
Lessee to the extent provided in the Lease.

                  SECTION 3.03. Payment After Indenture Event of Default, etc.
Except as otherwise provided in Sections 2.13, 3.02, 3.04(a) and (c) and 6.07
hereof, and notwithstanding Section 2.05 hereof, all payments received and
amounts held or realized by the Indenture Trustee after an Indenture Event of
Default shall have occurred and be continuing or after the Indenture Trustee has
given notice to the Owner Trustee and the Owner Participant pursuant to Section 
4.04(a) hereof regarding its exercise of remedies under Section 18 of the Lease
or of the foreclosure of this Indenture, or after the Equipment Notes shall have
become due and payable as provided herein, and all payments or amounts then held
by the Indenture Trustee as part of the Trust Indenture Estate, shall, so long
as such Indenture Event of Default shall be continuing, be promptly distributed
by the Indenture Trustee in the following order of priority, without
duplication:

                  first, so much of such payments or amounts as shall be
         required to reimburse the Indenture Trustee for all amounts due to it
         pursuant to Section 6.07 hereof, plus any tax, expense, charge or other
         loss (including, without limitation, all amounts to be expended at the
         expense of, or charged upon the tolls, rents, revenues, issues,
         products and profits of, the property included in the Trust Indenture
         Estate pursuant to Section 4.05(b) hereof) incurred by the Indenture
         Trustee (to the extent not previously reimbursed) (including, without
         limitation, the expenses of any sale, taking or other proceeding,
         reasonable attorneys' fees and expenses, court costs, and any other
         expenditures incurred or expenditures or advances made by the Indenture
         Trustee in the protection, exercise or enforcement of any right, power
         or remedy or any damages sustained by the Indenture Trustee, liquidated
         or otherwise, upon such Indenture Event of Default) shall be applied by
         the Indenture Trustee in reimbursement of such expenses;

                  second, so much of such payments or amounts remaining as shall
         be required to reimburse the then existing or prior Note Holders for
         payments made pursuant to Section 5.03 hereof (to the extent not
         previously reimbursed) shall be distributed to the then existing or
         prior Note Holders, and if the aggregate amount remaining shall be
         insufficient to pay all such amounts in full, it shall be distributed

                                 Trust Indenture
   52
                                     - 47 -



         ratably, without priority of one over any other, in accordance with the
         amount of the payment or payments made by each such then existing or
         prior Note Holder pursuant to said Section 5.03 and applicable (in the
         case of each such then existing Note Holder) to the Equipment Notes
         held by such existing Note Holder at the time of distribution by the
         Indenture Trustee;

                  third, (i) so much of such payments or amounts remaining as
         shall be required to pay in full the aggregate unpaid Principal Amount
         of all Series A Equipment Notes, and the accrued but unpaid interest
         and other amounts due thereon and all other Secured Obligations in
         respect of the Series A Equipment Notes (other than Make-Whole Amount,
         if any) to the date of distribution, shall be distributed to the Note
         Holders of Series A, and in case the aggregate amount so to be
         distributed shall be insufficient to pay in full as aforesaid, then
         ratably, without priority of one over the other, in the proportion that
         the aggregate unpaid Principal Amount of all Series A Equipment Notes
         held by each Holder plus the accrued but unpaid interest and other
         amounts due hereunder or thereunder (other than Make-Whole Amount, if
         any) to the date of distribution, bears to the aggregate unpaid
         Principal Amount of all Series A Equipment Notes held by all such
         Holders plus the accrued but unpaid interest and other amounts due
         thereon to the date of distribution;

             (ii) after giving effect to paragraph (i) above, so much of such
         payments or amounts remaining as shall be required to pay in full the
         aggregate unpaid Principal Amount of all Series B Equipment Notes, and
         the accrued but unpaid interest and other amounts due thereon and all
         other Secured Obligations in respect of the Series B Equipment Notes
         (other than Make-Whole Amount, if any) to the date of distribution,
         shall be distributed to the Note Holders of Series B, and in case the
         aggregate amount so to be distributed shall be insufficient to pay in
         full as aforesaid, then ratably, without priority of one over the
         other, in the proportion that the aggregate unpaid Principal Amount of
         all Series B Equipment Notes held by each Holder plus the accrued but
         unpaid interest and other amounts due hereunder or thereunder (other
         than Make-Whole Amount, if any) to the date of distribution, bears to
         the aggregate unpaid Principal Amount of all Series B Equipment Notes
         held by all such Holders plus the accrued but unpaid interest and other
         amounts due thereon to the date of distribution;

            (iii) after giving effect to paragraph (ii) above, so much of such
         payments or amounts remaining as shall be required to pay in full the
         aggregate unpaid Principal

                                 Trust Indenture
   53
                                     - 48 -



         Amount of all Series C Equipment Notes, and the accrued but unpaid
         interest and other amounts due thereon and all other Secured
         Obligations in respect of the Series C Equipment Notes (other than
         Make-Whole Amount, if any) to the date of distribution, shall be
         distributed to the Note Holders of Series C, and in case the aggregate
         amount so to be distributed shall be insufficient to pay in full as
         aforesaid, then ratably, without priority of one over the other, in the
         proportion that the aggregate unpaid Principal Amount of all Series C
         Equipment Notes held by each Holder plus the accrued but unpaid
         interest and other amounts due hereunder or thereunder (other than
         Make-Whole Amount, if any) to the date of distribution, bears to the
         aggregate unpaid Principal Amount of all Series C Equipment Notes held
         by all such Holders plus the accrued but unpaid interest and other
         amounts due thereon to the date of distribution; and

             (iv) after giving effect to paragraph (iii) above, so much of such
         payments or amounts remaining as shall be required to pay in full the
         aggregate unpaid Principal Amount of all Series D Equipment Notes, and
         the accrued but unpaid interest and other amounts due thereon and all
         other Secured Obligations in respect of the Series D Equipment Notes
         (other than Make-Whole Amount, if any) to the date of distribution,
         shall be distributed to the Note Holders of Series D, and in case the
         aggregate amount so to be distributed shall be insufficient to pay in
         full as aforesaid, then ratably, without priority of one over the
         other, in the proportion that the aggregate unpaid Principal Amount of
         all Series D Equipment Notes held by each Holder plus the accrued but
         unpaid interest and other amounts due hereunder or thereunder (other
         than Make-Whole Amount, if any) to the date of distribution, bears to
         the aggregate unpaid Principal Amount of all Series D Equipment Notes
         held by all such Holders plus the accrued but unpaid interest and other
         amounts due thereon to the date of distribution; and

                  fourth, the balance, if any, of such payments or amounts
         remaining thereafter shall be distributed to the Owner Trustee for
         distribution pursuant to the Trust Agreement and the Lease.

                  No Make-Whole Amount shall be due and payable on the Equipment
Notes as a consequence of the acceleration of the Equipment Notes.

                  SECTION 3.04. Certain Payments. (a) Any payments received by
the Indenture Trustee for which provision as to the application thereof is made
in the Lease shall be applied forthwith to the purpose for which such payment
was made in

                                 Trust Indenture
   54
                                     - 49 -



accordance with or as otherwise provided by the terms of the Lease.

                  (b) The Indenture Trustee will distribute promptly upon
receipt any indemnity payment received by it from the Owner Trustee or the
Lessee in respect of (i) the Indenture Trustee in its individual capacity, (ii)
any Pass Through Trust, (iii) the Subordination Agent, (iv) the Liquidity
Providers, and (v) the Pass Through Trustees, in each case whether pursuant to
Section 10 or 13 of the Lease or Section 21 of the Refunding Agreement or as
Supplemental Rent, directly to the Person entitled thereto. Any payment received
by the Indenture Trustee under clause (b) of the fourth paragraph of Section 
2.02 shall be distributed to the Subordination Agent to be distributed in
accordance with the terms of the Intercreditor Agreement, and any payment
received by the Indenture Trustee under clause (c) of the fourth paragraph of
Section 2.02 shall be distributed directly to the Persons entitled thereto.

                  (c) Notwithstanding anything to the contrary contained in this
Article III, any sums received by the Indenture Trustee that constitute Excepted
Payments shall be distributed promptly upon receipt by the Indenture Trustee
directly to the Person or Persons entitled thereto. Further, and notwithstanding
anything herein to the contrary, any sums received by the Indenture Trustee
under the Lease or any Sublease Assignment as security for the obligations of
the Lessee or the relevant Permitted Sublessee under the Operative Documents
shall be applied only to such obligations or as otherwise provided in the Lease.

                  SECTION 3.05. Other Payments. Subject to Sections 3.03 and
3.04 hereof, any payments received by the Indenture Trustee for which no
provision as to the application thereof is made elsewhere in this Indenture
shall be distributed by the Indenture Trustee, unless otherwise agreed in
writing, subject to Section 6.07 hereof (i) to the extent received or realized
at any time prior to the payment in full of all obligations to the Note Holders
secured by the Lien of this Indenture, in the order of priority specified in
Section 3.01 hereof, and (ii) to the extent received or realized at any time
after payment in full of all obligations to the Note Holders secured by the Lien
of this Indenture, in the following order of priority:

                  first, to the extent payments or amounts described in clause
         "first" of Section 3.03 hereof are otherwise obligations of Lessee
         under the Operative Documents or for which Lessee is obligated to
         indemnify against thereunder, in the manner provided in clause "first"
         of Section 3.03 hereof, and


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                                     - 50 -



                  second, in the manner provided in clause "fourth" of
         Section 3.03 hereof.

                  SECTION 3.06. Payments to Owner Trustee. Any amounts
distributed hereunder by the Indenture Trustee to the Owner Trustee shall be
paid to the Owner Trustee by wire transfer of funds of the type received by the
Indenture Trustee at such office and to such account or accounts of such entity
or entities as shall be designated by notice from the Owner Trustee to the
Indenture Trustee from time to time. The Owner Trustee hereby notifies the
Indenture Trustee that unless and until the Indenture Trustee receives notice to
the contrary from the Owner Trustee, all amounts to be distributed to the Owner
Trustee pursuant to clause "second" of Section 3.01 hereof shall be distributed
by wire transfer of funds of the type received by the Indenture Trustee to the
Owner Participant's account as may be specified pursuant to the Refunding
Agreement.

                  SECTION 3.07. Investment of Amounts Held by Indenture Trustee.
Any amounts held by the Indenture Trustee as assignee of the Owner Trustee's
rights to hold moneys for security pursuant to Section 21(h) of the Lease shall
be held in accordance with the terms of such Section ; and the Indenture Trustee
hereby agrees to perform the duties of the Owner Trustee under such Section .
Except as provided in the preceding sentence, any amounts held by the Indenture
Trustee pursuant to the proviso to clause "second" of Section 3.01 hereof,
pursuant to Section 3.02 hereof, pursuant to the second sentence of Section 
3.04(c) hereof, pursuant to the fourth sentence of Section 4.03 hereof, pursuant
to a Sublease Assignment, or pursuant to any provision of any other Operative
Document providing for amounts to be held by the Indenture Trustee which are not
distributed pursuant to the other provisions of Article III hereof shall be
invested by the Indenture Trustee from time to time in Specified Investments
selected in writing in a timely manner by the Lessee. Unless otherwise expressly
provided in this Indenture or the Lease, any income realized as a result of any
such investment and any payments by or on behalf of the Lessee pursuant to the
Lease in respect of any losses or expenses, net of the Indenture Trustee's
reasonable fees and expenses in making such investment, shall be held and
applied by the Indenture Trustee in the same manner as the principal amount of
such investment is to be applied and any losses, net of earnings and such
reasonable fees and expenses, shall be charged against the principal amount
invested. The Indenture Trustee shall not be liable for any loss resulting from
any investment required to be made by it under this Indenture other than by
reason of its willful misconduct or gross negligence, and any such investment
may be sold (without regard to its maturity) by the Indenture Trustee without
instructions whenever the Indenture

                                 Trust Indenture
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                                     - 51 -



Trustee reasonably believes such sale is necessary to make a distribution
required by this Indenture.


                                   ARTICLE IV

                      COVENANTS OF TRUST COMPANY AND OWNER
                      TRUSTEE; INDENTURE EVENTS OF DEFAULT;
                          REMEDIES OF INDENTURE TRUSTEE

                  SECTION 4.01. Covenants of Trust Company and Owner Trustee.
(a) The Trust Company hereby covenants and agrees that it will not directly or
indirectly create, incur, assume or suffer to exist any Lessor's Lien
attributable to it in its individual capacity with respect to any of the
properties or assets of the Trust Indenture Estate and shall, at its own cost
and expense promptly take such action as may be necessary duly to discharge any
such Lessor's Lien, and the Trust Company will cause restitution to be made to
the Trust Indenture Estate in the amount of any diminution of the value thereof
as the result of any Lessor's Liens attributable to it.

                  (b)  The Owner Trustee hereby covenants and agrees as
follows:

                  (i) the Owner Trustee will duly and punctually pay the
         Principal Amount of, Make-Whole Amount, if any, and interest on and
         other amounts due under the Equipment Notes and hereunder in accordance
         with the terms of the Equipment Notes and this Indenture and all
         amounts payable by it to the Note Holders under the Refunding Agreement
         and the other Operative Documents;

             (ii) the Owner Trustee will not directly or indirectly create,
         incur, assume or suffer to exist any Lessor's Liens attributable to it
         with respect to any of the properties or assets of the Trust Indenture
         Estate, and shall, at its own cost and expense, promptly take such
         action as may be necessary duly to discharge any such Lessor's Lien,
         and the Owner Trustee will cause restitution to be made to the Trust
         Indenture Estate in the amount of any diminution of the value thereof
         as the result of any Lessor's Liens attributable to it;

            (iii) in the event an officer with responsibility for or familiarity
         with the transactions contemplated hereunder or under the other
         Operative Documents (or any Vice President) in the Corporate Trust
         Administration Department of the Owner Trustee shall have actual
         knowledge of an Indenture Default or an Event of Loss, the Owner
         Trustee will give prompt written notice of such Indenture Default or
         Event of

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   57
                                     - 52 -



         Loss to the Indenture Trustee, the Lessee and the Owner Participant;

             (iv) the Owner Trustee will furnish to the Indenture Trustee,
         promptly upon receipt thereof, duplicates or copies of all reports,
         notices, requests, demands, certificates, financial statements and
         other instruments furnished to the Owner Trustee under the Lease or any
         Japanese Financing Document, including, without limitation, a copy of
         each report or notice received pursuant to Section 12(f) of the Lease,
         to the extent that the same shall not have been furnished, or is not
         required to be furnished by the Lessee, to the Indenture Trustee
         pursuant to the Lease or otherwise;

                  (v) except as contemplated by the Operative Documents or with
         the consent of the Indenture Trustee acting in accordance with Article
         IX hereof, the Owner Trustee will not incur any indebtedness for
         borrowed money; and

             (vi) the Owner Trustee will not enter into any business or other
         activity other than the business of owning the Aircraft, the leasing
         thereof to the Lessee and the carrying out of the transactions
         contemplated hereby and by the Japanese Lease Agreement, the Second
         Japanese Lease Assignment and the Lease, the Refunding Agreement, the
         Trust Agreement and the other Operative Documents.

                  SECTION 4.02. Indenture Events of Default. "Indenture Event of
Default" means any of the following events (whatever the reason for such
Indenture Event of Default and whether 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)      any Lease Event of Default shall occur and be
         continuing (other than a failure to pay when due any amount
         in respect of Excepted Payments); or

                  (b) the failure of the Owner Trustee to pay when due any
         payment of Principal Amount of, or interest on, any Equipment Note
         (other than as a result of a Lease Default) and such failure shall have
         continued unremedied for ten calendar days; or the failure of the Owner
         Trustee to pay when due any other amount due and payable under any
         Equipment Note or hereunder (other than as a result of a Lease Default)
         and such failure shall have continued unremedied for 15 calendar days
         after notice thereof being given to the Owner Trustee from the
         Indenture Trustee or any Note Holder; or


                                 Trust Indenture
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                                     - 53 -



                  (c) any Lessor's Lien required to be discharged by the Trust
         Company pursuant to Section 4.01(a) hereof or Section 13 of the
         Refunding Agreement or by the Owner Trustee as the Owner Trustee
         pursuant to Section 4.01(b)(ii) hereof or Section 13 of the Refunding
         Agreement or any Lessor's Lien required to be discharged by the Owner
         Participant pursuant to Section 13 of the Refunding Agreement shall
         remain undischarged for a period of 30 calendar days after, as the case
         may be, an officer with responsibility for or familiarity with the
         transactions contemplated hereunder or under the other Operative
         Documents (or any Vice President) in the Corporate Trust Administration
         Department of the Trust Company or an officer of the Owner Participant
         shall have actual knowledge of such Lien; provided, that no Indenture
         Event of Default shall arise under this Section 4.02(c) as a result of
         a failure by the Owner Trustee or the Owner Participant to observe or
         perform any covenant referred to in this Section 4.02(c) if the Lessee
         shall have discharged all Lessor's Liens required to be discharged by
         the Owner Trustee or the Owner Participant pursuant to such covenants
         and compensated the Indenture Trustee and the Trust Indenture Estate
         for all claims, losses and expenses arising from the failure of the
         Owner Trustee or the Owner Participant, as the case may be, to observe
         and perform any such covenant; or

                  (d) any representation or warranty made by the Owner
         Participant, the Owner Trustee or the Trust Company herein or in the
         Refunding Agreement or by any Person (if any) guaranteeing or
         supporting the obligations of the Owner Participant under the Operative
         Documents or in any related guarantee or support agreement shall prove
         to have been false or incorrect when made in any respect materially
         adverse to the rights and interests of the Note Holders; and if such
         misrepresentation is capable of being corrected as of a subsequent date
         and if such correction is being sought diligently, such
         misrepresentation shall not have been corrected as of a day within 30
         calendar days following notice thereof being given to the Owner
         Participant, the Owner Trustee, the Trust Company or such Person, as
         the case may be, by the Indenture Trustee or a Majority in Interest of
         Note Holders; or

                  (e) any failure of the Owner Trustee to observe or perform any
         of its covenants or agreements in the fourth paragraph following the
         Habendum Clause hereof or in clauses (b)(v) and (b)(vi) of Section 4.01
         hereof, or any failure by the Owner Participant or the Trust Company to
         observe or perform any of its respective covenants in Section 9(b)(11),
         10 or 14 of the Refunding Agreement; or


                                 Trust Indenture
   59
                                     - 54 -



                  (f) except as provided in the following paragraph (j), any
         failure by the Owner Trustee or the Trust Company to observe or perform
         any other covenant or obligation of the Owner Trustee contained in this
         Indenture or in the Refunding Agreement or any failure by the Owner
         Participant to observe or perform any other covenant or obligation of
         the Owner Participant contained in the Refunding Agreement or any
         failure of any Person that may guarantee or support the obligations of
         an Owner Participant not originally party to the Refunding Agreement
         under the Operative Documents to observe or perform any covenant or
         obligation of such Person contained in any such guarantee or support
         agreement, which failure is not remedied within a period of 30 calendar
         days following notice being given to the Owner Trustee, the Owner
         Participant or such Person, as the case may be, by the Indenture
         Trustee or a Majority in Interest of Note Holders; or

                  (g) either the Trust Estate or the Owner Trustee with respect
         thereto (and not in its individual capacity) or the Owner Participant
         or any Person that may guarantee or support the obligations of an Owner
         Participant not originally party to the Refunding Agreement under the
         Operative Documents shall (i) be unable to pay its debts generally as
         they become due within the meaning of the Bankruptcy Code, (ii) file,
         or consent by answer or otherwise to the filing against it of a
         petition for relief or reorganization or arrangement or any other
         petition in bankruptcy, for liquidation or to take advantage of any
         bankruptcy or insolvency law of any jurisdiction, (iii) make an
         assignment for the benefit of its creditors, (iv) consent to the
         appointment of a custodian, receiver, trustee or other officer with
         similar powers of itself or any substantial part of its property, or
         (v) take corporate or comparable action for the purpose of any of the
         foregoing; or

                  (h) a court or governmental authority of competent
         jurisdiction shall enter an order appointing, without consent by the
         Trust Estate or the Owner Trustee with respect thereto (and not in its
         individual capacity) or the Owner Participant or any Person that may
         guarantee or support the obligations of an Owner Participant not
         originally party to the Refunding Agreement under the Operative
         Documents, as the case may be, a custodian, receiver, trustee or other
         officer with similar powers with respect to it or with respect to any
         substantial part of its property, or constituting an order for relief
         or approving a petition for relief or reorganization or any other
         petition in bankruptcy or for liquidation or to take advantage of any
         bankruptcy or insolvency law of any jurisdiction, or

                                 Trust Indenture
   60
                                     - 55 -



         ordering the dissolution, winding-up or liquidation of the Trust Estate
         or the Owner Trustee with respect thereto (and not in its individual
         capacity) or the Owner Participant or such Person, as the case may be;
         or

                  (i) any petition for any relief specified in the foregoing
         paragraph (h) shall be filed against the Trust Estate or the Owner
         Trustee with respect thereto (and not in its individual capacity) or
         the Owner Participant or any Person that may guarantee or support the
         obligations of an Owner Participant not originally party to the
         Refunding Agreement under the Operative Documents, as the case may be,
         and such petition shall not be dismissed within 60 days; or

                  (j) at any time when the Aircraft shall be registered in a
         jurisdiction outside the United States, the Owner Trustee, the Trust
         Company or the Owner Participant shall breach any covenant as may be
         agreed upon pursuant to Section 11 of the Refunding Agreement as the
         result of which the Lien of this Indenture shall cease to be a valid
         and duly perfected Lien on the Trust Indenture Estate.

                  SECTION 4.03. Certain Rights. In the event of any default by
the Lessee in the payment of any installment of Basic Rent due under the Lease,
the Owner Participant may, within ten calendar days (or such longer period
ending on the expiry of the applicable grace period specified in the Lease with
respect to such default) after notice of such default, without the consent or
concurrence of any Note Holder, pay, as provided in Section 2.04 hereof, for
application in accordance with Section 3.01 hereof, a sum equal to the amount of
all (but not less than all) of the Principal Amount and interest as shall then
(without regard to any acceleration pursuant to Section 4.04(b) or (c) hereof)
be due and payable on the Equipment Notes. In the event of any default by the
Lessee in any obligation under the Lease other than the payment of Basic Rent,
if such default can be remedied by the payment of money and the Owner Trustee
shall have been furnished by the Owner Participant with all funds necessary for
remedying such default, the Owner Participant may, within fifteen calendar days
(or such longer period ending on the expiry of any applicable grace period
specified in the Lease with respect to such default) after notice of such
default, without the consent or concurrence of any Note Holder, instruct the
Owner Trustee to exercise the Owner Trustee's rights under Section 21(d) of the
Lease to perform such obligation on behalf of the Lessee. Solely for the purpose
of determining whether there exists an Indenture Event of Default, (a) any
timely payment by the Owner Participant pursuant to, and in compliance with, the
first sentence of this Section 4.03 shall be deemed to remedy (but solely for
purposes of this Indenture) any default by the Lessee in the payment of Basic
Rent theretofore due and payable

                                 Trust Indenture
   61
                                     - 56 -



and to remedy (but solely for purposes of this Indenture) any default by the
Owner Trustee in the payment of any amount due and payable under the Equipment
Notes or hereunder, and (b) any timely performance by the Owner Trustee of any
obligation of the Lessee under the Lease pursuant to, and in compliance with,
the second sentence of this Section 4.03 shall be deemed to remedy (but solely
for purposes of this Indenture) any default by the Lessee under the Lease to the
same extent that like performance by the Lessee itself would have remedied such
default (but any such payment or performance shall not relieve the Lessee of its
duty to pay all Rent and perform all of its obligations pursuant to the Lease).
If, on the basis specified in the preceding sentence, such Lease Event of
Default shall have been remedied, then any declaration pursuant to the Lease
that the Lease is in default, and any declaration pursuant to this Indenture
that the Equipment Notes are due and payable or that an Indenture Event of
Default exists hereunder, based upon such Lease Event of Default, shall be
deemed to be rescinded, and the Owner Participant or the Owner Trustee, as the
case may be, shall (to the extent of any such payments made by it) be subrogated
to the rights of the Note Holders hereunder to receive such payment of Rent from
the Indenture Trustee (and the payment of interest on account of such Rent being
overdue), and shall be entitled, so long as no other Indenture Default or
Indenture Event of Default shall have occurred and be continuing or would result
therefrom, to receive, subject to the terms of this Indenture, such payment upon
receipt thereof by the Indenture Trustee; provided that the Owner Participant
shall not otherwise attempt to recover any such amount paid by it on behalf of
the Lessee pursuant to this Section 4.03 except by demanding of the Lessee
payment of such amount, or by commencing an action at law against the Lessee and
obtaining and enforcing a judgment against the Lessee for the payment of such
amount; provided, however, that at no time while an Indenture Event of Default
shall have occurred and be continuing shall any such demand be made or shall any
such action be commenced (or continued) and any amounts nevertheless received by
the Owner Participant in respect thereof shall be held in trust for the benefit
of, and promptly paid to, the Indenture Trustee for distribution as provided in
Section 3.03 hereof; and provided, further, that

                  (x) this Section 4.03 shall not apply with respect to any
         default in the payment of Basic Rent due under the Lease, if the Lessee
         itself shall have theretofore failed to pay Basic Rent in the manner
         required under the Lease as to (i) each of the three Basic Rent Payment
         Dates immediately preceding the date of such default or (ii) in the
         aggregate more than six Basic Rent Payment Dates,

                  (y)      the second sentence of this Section 4.03 shall
         cease to apply, and no payment by the Owner Participant in

                                 Trust Indenture
   62
                                     - 57 -



         respect of Supplemental Rent or performance of any obligation of the
         Lessee under the Lease by the Owner Trustee shall be deemed to remedy
         or to have remedied any Lease Event of Default for the purposes of this
         Indenture, if during the 12-month period immediately preceding the
         relevant default by the Lessee there shall have been expended by the
         Owner Participant pursuant to the second sentence of this Section 4.03
         (and shall have not been reimbursed by the Lessee or any Permitted
         Sublessee themselves to the Owner Trustee for distribution to the Owner
         Participant) an amount in excess of $3,500,000, and

                  (z) neither the Owner Trustee nor the Owner Participant shall
         (without the prior written consent of a Majority in Interest of Note
         Holders) have the right to cure any Lease Default or Lease Event of
         Default except as specified in this Section 4.03.

                  SECTION 4.04. Remedies. (a) If an Indenture Event of Default
shall have occurred and be continuing and so long as the same shall be
continuing unremedied, then and in every such case the Indenture Trustee may
(subject to the rights of the Owner Participant or the Owner Trustee to cure any
such Indenture Event of Default set forth in Section 4.03 hereof and the
obligations of the Indenture Trustee set forth in this Section 4.04(a) and
subject to Section 10.05 hereof) exercise any or all of the rights and powers
and pursue any and all of the remedies pursuant to this Article IV and shall
have and may exercise all of the rights and remedies of a secured party under
the Uniform Commercial Code and, in the event such Indenture Event of Default is
an Indenture Event of Default referred to in paragraph (a) of Section 4.02
hereof, the Indenture Trustee may (subject as aforesaid), at the direction of a
Majority in Interest of Note Holders, exercise any and all of the remedies
pursuant to Section 18 of the Lease and pursuant to any Sublease Assignment and
may take possession of all or any part of the properties covered or intended to
be covered by the Lien and security interest created hereby or pursuant hereto
but, in the case of the Aircraft, only as permitted by Section 18 of the Lease,
and may exclude the Owner Participant, the Owner Trustee and the Lessee and all
Persons claiming under any of them or wholly or partly therefrom; provided,
however, that the Indenture Trustee shall give the Owner Trustee and the Owner
Participant ten days' prior written notice of the initial exercise of such
remedies by the Indenture Trustee under the Lease (if not stayed or otherwise
precluded by applicable law from giving such notice); provided, further, that
the Indenture Trustee shall give the Owner Trustee and the Owner Participant
twenty days' prior written notice of its intention to sell the Aircraft. Without
limiting any of the foregoing, it is understood and agreed that the Indenture
Trustee may exercise any right of sale of the Aircraft available to it, even
though it

                                 Trust Indenture
   63
                                     - 58 -



shall not have taken possession of the Aircraft and shall not have possession
thereof at the time of such sale.

                  Anything in this Indenture to the contrary notwithstanding,
the Indenture Trustee shall not be entitled to exercise any remedy hereunder if
there shall have occurred or be continuing a Lease Event of Default unless the
Indenture Trustee shall have exercised or concurrently be exercising one or more
of the remedies provided for in Section 18 of the Lease to terminate the Lease
or take possession and/or sell the Aircraft; provided, however, that such
requirement to exercise one or more of such remedies under the Lease shall not
apply in circumstances where the Indenture Trustee is, and has been, for a
continuous period in excess of 60 days or such other period as may be specified
in Section 1110(a)(1)(A) of the Bankruptcy Code (such 60-day or other period
being the "Section 1110 Period"), stayed or prohibited by applicable law or
court order from exercising such remedies under the Lease (a "Continuous Stay
Period"); provided further, however, that the requirement to exercise one or
more of such remedies under the Lease shall nonetheless be applicable during a
Continuous Stay Period subsequent to the expiration of the Section 1110 Period
to the extent that the continuation of such Continuous Stay Period subsequent to
the expiration of the Section 1110 Period (A) results from an agreement by the
trustee or the debtor-in-possession in such proceeding during the Section 1110
Period with the approval of the relevant court to perform the Lease in
accordance with Section 1110(a)(1)(A) of the Bankruptcy Code and continues to
perform as required by Section 1110(a)(1) of the Bankruptcy Code or (B) is an
extension of the Section 1110 Period with the consent of the Indenture Trustee
pursuant to Section 1110(b) of the Bankruptcy Code or (C) results from the
Lessee's assumption during the Section 1110 Period with the approval of the
relevant court of the Lease pursuant to Section 365 of the Bankruptcy Code or
(D) is the consequence of the Indenture Trustee's own failure to give any
requisite notice to any Person (unless the Indenture Trustee is stayed or
otherwise precluded by applicable law from giving such notice). In the event
that the applicability of Section 1110 of the Bankruptcy Code to the Aircraft is
being contested by the Lessee in judicial proceedings, so long as the Indenture
Trustee fails to participate in such proceedings, the Owner Trustee shall have
the right (without affecting in any way any right or remedy of the Indenture
Trustee hereunder) to participate in such proceedings.

                  The foregoing shall not preclude the Indenture Trustee from
notifying any Permitted Sublessee that payments under any Assigned Sublease are
to be made directly to it pursuant to the terms of the relevant Sublease
Assignment, or, except as expressly provided above, from exercising its rights
or remedies hereunder and under the other Operative Documents. For the

                                 Trust Indenture
   64
                                     - 59 -



avoidance of doubt, it is expressly understood and agreed, subject only to the
immediately preceding paragraph, that the above-described inability of the
Indenture Trustee to exercise any right or remedy under the Lease shall in no
event and under no circumstance prevent the Indenture Trustee from otherwise
exercising all of its rights, powers and remedies under this Indenture,
including without limitation this Article IV.

                  (b) If an Indenture Event of Default referred to in clause
(g), (h) or (i) of Section 4.02 hereof shall have occurred, or a Lease Event of
Default under clause (e), (f) or (g) of Section 17 of the Lease shall have
occurred, then and in every such case the unpaid Principal Amount of all
Equipment Notes then outstanding, together with accrued but unpaid interest and
all other amounts due thereunder and hereunder, shall immediately and without
further act become due and payable without presentment, demand, protest or
notice, all of which are hereby waived.

                  (c) If any Indenture Event of Default not specified in Section
4.04(b) hereof shall have occurred and be continuing, then and in every such
case the Indenture Trustee may (and shall, upon receipt of a written demand
therefor from a Majority in Interest of Note Holders), subject to Section 4.03
hereof, at any time, by written notice or notices to the Owner Trustee, declare
the unpaid Principal Amount of all Equipment Notes to be due and payable,
whereupon the unpaid Principal Amount of all Equipment Notes then outstanding,
together with accrued but unpaid interest thereon and all other amounts due
thereunder and hereunder, shall immediately become due and payable without
presentment, demand, protest or further notice, all of which are hereby waived.

                  (d) Sections 4.04(b) and (c), however, are subject to the
condition that, if at any time after the Principal Amount of the Equipment Notes
shall have become so due and payable, and before any judgment or decree for the
payment of the money so due, or any thereof, shall be entered, all overdue
payments of interest upon the Equipment Notes and all other amounts payable
under the Equipment Notes (except the Principal Amount of the Equipment Notes
which by such declaration shall have become payable) shall have been duly paid
and every other Indenture Default and Indenture Event of Default with respect to
any covenant or provision of this Indenture shall have been cured, then and in
every such case a Majority in Interest of Note Holders may (but shall not be
obligated to), by written instrument filed with the Indenture Trustee, rescind
and annul the Indenture Trustee's declaration and its consequences; but no such
rescission or annulment shall extend to or affect any subsequent Indenture
Default or Indenture Event of Default or impair any right consequent thereon.


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                  Any acceleration pursuant to Sections 4.04(b) and (c) shall be
automatically rescinded and any related declaration of an Indenture Event of
Default annulled in the event that the Owner Trustee or the Owner Participant,
as the case may be, shall have cured, in accordance with Section 4.03, the
Indenture Event of Default that resulted in such acceleration.

                  Except as otherwise provided in Section 2.12, no Make-Whole
Amount shall become payable on the Equipment Notes as a result of any
acceleration under Sections 4.04(b) or 4.04(c).

                  (e) Each Note Holder shall be entitled, at any sale pursuant
to Section 18 of the Lease, to credit against any purchase price bid at such
sale by such Note Holder all or any part of the unpaid obligations owing to such
Note Holder and secured by the Lien of this Indenture. The Owner Trustee or
Owner Participant may be a cash purchaser at any such sale.

                  (f) Notwithstanding anything contained herein, so long as the
Pass Through Trustee under any Pass Through Trust Agreement or the Subordination
Agent on its behalf is a Note Holder, the Indenture Trustee will not be
authorized or empowered to acquire title to any property in the Trust Indenture
Estate or take any action with respect to any property in the Trust Indenture
Estate so acquired by it if such acquisition or action would cause any trust
created pursuant to the Trust Agreement to fail to qualify as a "grantor trust"
for federal income tax purposes.

                  SECTION 4.05. Return of the Aircraft, etc. (a) If an Indenture
Event of Default shall have occurred and be continuing, at the request of the
Indenture Trustee the Owner Trustee shall promptly execute and deliver to the
Indenture Trustee such instruments of title and other documents as the Indenture
Trustee may deem necessary or advisable to enable the Indenture Trustee or an
agent or representative designated by the Indenture Trustee, at such time or
times and place or places as the Indenture Trustee may specify, to obtain
possession of all or any part of the Trust Indenture Estate; provided that the
Indenture Trustee shall at the time be entitled to obtain such possession under
Section 4.04(a) and the other applicable provisions of this Indenture. If the
Owner Trustee shall for any reason fail to execute and deliver such instruments
and documents after such request by the Indenture Trustee, the Indenture Trustee
may (i) obtain a judgment conferring on the Indenture Trustee the right to
immediate possession and requiring the Owner Trustee to execute and deliver such
instruments and documents to the Indenture Trustee, to the entry of which
judgment the Owner Trustee hereby specifically consents to the fullest extent it
may lawfully do so, and (ii) to the extent permitted by law, pursue all or part
of the Trust Indenture Estate wherever it may be

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                                     - 61 -



found (but not in violation of Section 10.05 hereof or of the Lease) and may
enter any of the premises of the Lessee wherever such Trust Indenture Estate may
be or be supposed to be and search for and take possession of and remove the
same (but not in violation of Section 10.05 hereof or of the Lease). All
expenses of obtaining such judgment or of pursuing, searching for and taking
such property shall, until paid, be secured by the Lien of this Indenture.

                  (b) Upon a Lease Event of Default which is continuing, the
Indenture Trustee may, from time to time, at the expense of the Trust Indenture
Estate, make all such expenditures for maintenance, insurance, repairs,
replacements, alterations, additions and improvements to and of the Trust
Indenture Estate, as it may deem proper (it being understood and agreed that the
provisions hereof shall not be construed so as to expand the obligations of the
Lessee under the Lease, including Section 16 thereof). In each such case, the
Indenture Trustee shall have the right to maintain, use, operate, store, lease,
control or manage the Trust Indenture Estate and to carry on the business
(without limiting the express provisions of Section 5.10 hereof) and to exercise
all rights and powers of the Owner Participant and the Owner Trustee relating to
the Trust Indenture Estate, as the Indenture Trustee shall deem best, including
the right to enter into any and all such agreements with respect to the
maintenance, insurance, use, operation, storage, leasing, control, management or
disposition of the Trust Indenture Estate or any part thereof as the Indenture
Trustee may determine; and the Indenture Trustee shall be entitled to collect
and receive directly all tolls, rents (including Rent), revenues, issues,
income, products and profits of the Trust Indenture Estate and every part
thereof, except Excepted Payments, without prejudice, however, to the right of
the Indenture Trustee under any provision of this Indenture to collect and
receive all cash held by, or required to be deposited with, the Indenture
Trustee hereunder, except Excepted Payments. The Indenture Trustee shall,
pursuant to the exercise of its remedies under this Article IV, to the extent
permitted by applicable law, be entitled to the appointment of a receiver for
all or any part of the Trust Indenture Estate, whether such receivership be
incidental to a proposed sale of the Trust Indenture Estate or otherwise, and
the Owner Trustee hereby consents to the appointment of such receiver and will
not oppose any such appointment. Such tolls, rents (including Rent), revenues,
issues, income, products and profits shall be applied to pay the expenses of the
use, operation, storage, leasing, control, management or disposition of the
Trust Indenture Estate and of conducting the business thereof, and of all
maintenance, repairs, replacements, alterations, additions and improvements, and
to make all payments which the Indenture Trustee may be required or may elect to
make, if any, for taxes, assessments, insurance or

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                                     - 62 -



other proper charges upon the Trust Indenture Estate 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 Owner Trustee),
and all other payments that the Indenture Trustee may be required or authorized
to make under any provision of this Indenture, as well as just and reasonable
compensation for the services of the Indenture Trustee, and of all Persons
properly engaged and employed by the Indenture Trustee.

                  SECTION 4.06. Remedies Cumulative. Each and every right, power
and remedy given to the Indenture Trustee specifically or otherwise in this
Indenture 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 Indenture
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
same time or thereafter any other right, power or remedy. No delay or omission
by the Indenture 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 Owner Trustee or the
Lessee or to be an acquiescence therein.

                  SECTION 4.07. Discontinuance of Proceedings. In case the
Indenture Trustee or any Note Holder shall have instituted any proceeding to
enforce any right, power or remedy under this Indenture by foreclosure, entry or
otherwise, and such proceedings shall have been discontinued or abandoned for
any reason or shall have been determined adversely to the Indenture Trustee or
such Note Holder, then and in every such case the Owner Trustee, the Indenture
Trustee, the Note Holders and the Lessee shall, subject to any determination in
such proceedings, be restored to their former positions and rights hereunder
with respect to the Trust Indenture Estate, and all rights, remedies and powers
of the Indenture Trustee and the Note Holders shall continue as if no such
proceedings had been instituted.

                  SECTION 4.08. Waiver of Past Indenture Defaults. Upon written
instructions from a Majority in Interest of Note Holders, the Indenture Trustee
shall waive any past Indenture Default hereunder and its consequences and upon
any such waiver such Indenture Default shall cease to exist and any Indenture
Event of Default arising therefrom shall be deemed to have been cured for every
purpose of this Indenture, but no such waiver shall extend to any subsequent or
other Indenture Default or impair any right consequent thereon; provided,
however, that in the absence of

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                                     - 63 -



written instructions from the Holders of all Equipment Notes then outstanding,
the Indenture Trustee shall not waive any Indenture Default (i) in the payment
of the Principal Amount of or interest on any Equipment Note then outstanding,
or (ii) in respect of a covenant or provision hereof which, under Article IX
hereof, cannot be modified or amended without the consent of each Note Holder.

                  SECTION 4.09. Indenture Trustee May Prove Debt. If the Owner
Trustee shall fail to pay any amount payable hereunder or under the Equipment
Notes, the Indenture Trustee, in its own name and as trustee of an express
trust, shall be entitled and empowered to institute any action or proceedings at
law or in equity for the collection of the sums so due and unpaid, and may
prosecute any such action or proceedings to judgment or final decree, and may
enforce any such judgment or final decree against the Owner Trustee or other
obligor upon the Equipment Notes and collect in the manner provided by law out
of the property of the Owner Trustee or other obligor upon the Equipment Notes,
wherever situated the moneys adjudged or decreed to be payable.

                  In case there shall be pending proceedings relative to the
Owner Trustee under the Bankruptcy Code or any other applicable Federal or state
bankruptcy, insolvency or other similar law, or in case a receiver, assignee or
trustee in bankruptcy or reorganization, liquidator, sequestrator or similar
official shall have been appointed for or taken possession of the Owner Trustee
or its property, or in case of any other comparable judicial proceedings
relative to the Owner Trustee upon the Equipment Notes, or to the property of
the Owner Trustee, the Indenture Trustee, irrespective of whether the Principal
Amount of the Equipment Notes shall then be due and payable as therein expressed
or by declaration or otherwise and irrespective of whether the Indenture Trustee
shall have made any demand pursuant to the provisions of this Section , shall be
entitled and empowered, by intervention in such proceedings or otherwise:

                  (a) to file and prove a claim or claims for the whole amount
         of Principal Amount and interest owing and unpaid in respect of the
         Equipment Notes, and to file such other papers or documents as may be
         necessary or advisable in order to have the claims of the Indenture
         Trustee (including any claim for reasonable compensation, expenses and
         disbursements to the Indenture Trustee and each predecessor Indenture
         Trustee, and their respective agents, attorneys and counsel, and for
         reimbursement of the Indenture Trustee and each predecessor Indenture
         Trustee, except as a result of negligence or bad faith) and of the Note
         Holders allowed in any judicial proceedings relative to the Owner
         Trustee or to the property of the Owner Trustee,


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                                     - 64 -



                  (b) unless prohibited by applicable law and regulations, to
         vote on behalf of the Note Holders in any election of a trustee or a
         standby trustee in arrangement, reorganization, liquidation or other
         bankruptcy or insolvency proceedings or Person performing similar
         functions in comparable proceedings, and

                  (c) to collect and receive any moneys or other property
         payable or deliverable on any such claims, and to distribute all
         amounts received with respect to the claims of the Note Holders and of
         the Indenture Trustee on their behalf;

and any trustee, receiver, or liquidator, custodian or other similar official is
hereby authorized by each of the Note Holders (by such Note Holder's acceptance
of an Equipment Note) to make payments to the Indenture Trustee, and, in the
event that the Indenture Trustee shall consent to the making of payments
directly to the Note Holders, to pay to the Indenture Trustee such amounts as
shall be sufficient to cover reasonable compensation, expenses and disbursements
to the Indenture Trustee, each predecessor Indenture Trustee and their
respective agents, attorneys and counsel, and all other expenses and liabilities
incurred by the Indenture Trustee and each predecessor Indenture Trustee except
as a result of negligence or bad faith.

                  Nothing herein contained shall be deemed to authorize the
Indenture Trustee to authorize or consent to or vote for or accept or adopt on
behalf of any Note Holder any plan of reorganization, arrangement, adjustment or
composition affecting the Equipment Notes or the rights of any Holder thereof,
or to authorize the Indenture Trustee to vote in respect of the claim of any
Note Holder in any such proceeding except, as aforesaid, to vote for the
election of a trustee in bankruptcy or similar Person.

                  All rights of action and of asserting claims under this
Indenture, or under any of the Equipment Notes, may be prosecuted and enforced
by the Indenture Trustee without the possession of any of the Equipment Notes or
the production thereof in any trial or other proceedings relative thereto, and
any such action or proceedings instituted by the Indenture Trustee shall be
brought in its own name as trustee of an express trust, and any recovery of
judgment, subject to the payment of the expenses, disbursements and compensation
of the Indenture Trustee, each predecessor Indenture Trustee and their
respective agents and attorneys, shall be for the ratable benefit of the Note
Holders.

                  In any proceedings brought by the Indenture Trustee (and also
any proceedings involving the interpretation of any provision of this Indenture
to which the Indenture Trustee shall

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                                     - 65 -



be a party), the Indenture Trustee shall be held to represent all the Note
Holders, and it shall not be necessary to make any Note Holders parties to any
such proceedings.

                  SECTION 4.10. Limitations on Suits by Note Holders. No Note
Holder shall have any right to pursue a remedy under this Indenture or any
Equipment Note, unless such Note Holder previously shall have given to the
Indenture Trustee written notice of an Indenture Default and of the continuance
thereof, as hereinbefore provided, and unless also a Majority in Interest of
Note Holders shall have made a written request to the Indenture Trustee to
pursue such remedy and shall have offered to the Indenture Trustee such
reasonable indemnity as it may require against the costs, expenses and
liabilities to be incurred therein or thereby and the Indenture Trustee for 60
days after its receipt of such notice, request and offer of indemnity shall have
failed to pursue such remedy and no direction inconsistent with such written
request shall have been given to the Indenture Trustee during such 60-day period
pursuant to Section 5.02 hereof; it being understood and intended, and being
expressly covenanted by each Note Holder and the Indenture Trustee, that no one
or more Note Holders shall have any right in any manner whatever by virtue or by
availing of any provision of this Indenture to affect, disturb or prejudice the
rights of any other Note Holder or, except as otherwise provided herein
(including, without limitation, Section 2.13), to obtain or seek to obtain
priority over or preference to any other such Note Holder or to enforce any
right under this Indenture, except in the manner herein provided. For the
protection and enforcement of the provisions of this Section 4.10, each and
every Note Holder and the Indenture Trustee shall be entitled to such relief as
can be given either at law or in equity.

                  SECTION 4.11. Unconditional Right of Note Holders to Receive
Principal, Interest and Premium, and to Institute Certain Suits. Notwithstanding
any other provision in this Indenture and any provision of any Equipment Note,
the right of any Note Holder to receive payment of the Principal Amount of and
interest on such Equipment Note on or after the respective due dates expressed
in such Equipment Note, or, subject to Section 4.10, to institute suit in a
manner consistent with the limitations contained in Section 4.04(a) hereof for
the enforcement of any such payment on or after such respective dates as herein
provided, shall not be impaired or affected without the consent of such Note
Holder.

                  SECTION 4.12. Exercise of Remedies by Foreign Note Holders. If
the Indenture Trustee shall exercise remedies pursuant to this Article IV, at a
time when (i) the Aircraft is registered with the Federal Aviation
Administration, (ii) 25% or more of the then unpaid Principal Amount of the
Equipment Notes

                                 Trust Indenture
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                                     - 66 -



is held by one or more Persons which are not a "citizen of the United States"
within the meaning of Section 40102(a)(15) of the Federal Aviation Act and (iii)
remedies are to be exercised pursuant to this Article IV as a result of the
occurrence of an Indenture Event of Default which is not a Lease Event of
Default, the Indenture Trustee shall make arrangements, if any, as may be
required by law so that such exercise of remedies shall not result in the
ineligibility of the Aircraft to be registered under the Federal Aviation Act.


                                    ARTICLE V

                         DUTIES OF THE INDENTURE TRUSTEE

                  SECTION 5.01. Notice of Indenture Event of Default. In the
event the Indenture Trustee shall have knowledge of an Indenture Event of
Default, or shall have knowledge of an Indenture Default arising either from a
failure to pay Rent or a Lease Default of the type referred to in the second
sentence of Section 4.03, the Indenture Trustee shall give prompt notice thereof
to the Owner Trustee, the Owner Participant and the Lessee by facsimile, telex,
telegraph or telephone (confirmed by written notice in the manner provided by
Section 10.06 hereof), and to each Note Holder by first-class mail. Subject to
the terms of Sections 2.12, 4.03, 4.04, 4.08, 4.09, 5.03, 5.10 and 10.05 hereof
and of this Section 5.01, the Indenture Trustee shall take such action, or
refrain from taking such action, with respect to any Indenture Event of Default
or Indenture Default (including with respect to the exercise of any rights or
remedies hereunder) as the Indenture Trustee shall be instructed in writing by a
Majority in Interest of Note Holders. Subject to the provisions of Section 5.03
hereof, if the Indenture Trustee shall not have received instructions as above
provided within 20 calendar days after mailing notice of such Indenture Default
or Indenture Event of Default to the Note Holders, the Indenture Trustee may,
subject to instructions thereafter received pursuant to the preceding provisions
of this Section 5.01, take such action, or refrain from taking such action, but
shall be under no duty to take or refrain from taking any action, with respect
to such Indenture Default or Indenture Event of Default as it shall determine to
be advisable and in the best interests of the Note Holders and shall use the
same degree of care and skill in connection therewith as a prudent person would
use under the circumstances in the conduct of its own affairs; provided that the
Indenture Trustee may not sell the Aircraft or any part thereof without the
consent of a Majority in Interest of Note Holders. In the event the Indenture
Trustee shall at any time elect to foreclose or otherwise enforce this
Indenture, the Indenture Trustee shall forthwith notify, to the extent (in the
case of any such party) not stayed or otherwise prohibited by

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                                     - 67 -



applicable law, the Owner Participant, the Note Holders, the Owner Trustee and
the Lessee. For all purposes of this Indenture, in the absence of actual
knowledge on the part of an officer in the Corporate Trust Office, in the case
of the Indenture Trustee, or its Corporate Trust Administration Department, in
the case of the Owner Trustee, the Indenture Trustee or the Owner Trustee, as
the case may be, shall not be deemed to have knowledge of an Indenture Event of
Default (except, in the case of the Indenture Trustee, the failure of the Lessee
to pay any installment of Rent when due, if any portion of such installment was
then required to be paid to the Indenture Trustee, which failure shall
constitute knowledge of an Indenture Default for purposes of the first sentence
of this Section 5.01) unless notified in writing by the Lessee, the Owner
Trustee or one or more Note Holders or, in the case of the Owner Trustee, by the
Indenture Trustee.

                  SECTION 5.02. Action Upon Instructions. Subject to the terms
of Sections 2.12, 4.03, 4.04, 4.08, 4.09, 5.01, 5.03, 5.10, 9.01 and 10.05
hereof, upon the written instructions at any time and from time to time of a
Majority in Interest of Note Holders, the Indenture Trustee shall take such of
the following actions as may be specified in such instructions: (i) exercise
such election or option, or make such decision or determination, or give such
notice, consent, waiver or approval or exercise such right, remedy or power to
take such other action hereunder or under any other Indenture Document or in
respect of any part or all of the Trust Indenture Estate as shall be specified
in such instructions; (ii) take such action with respect to, or to preserve or
protect, the Trust Indenture Estate (including the discharge of Liens) as shall
be specified in such instructions and as are consistent with this Indenture; and
(iii) take such other action in respect of the subject matter of this Indenture
as is consistent with the terms hereof and of the other Indenture Documents. The
Indenture Trustee will execute and the Owner Trustee will file or cause to be
filed such continuation statements with respect to financing statements relating
to the security interest created hereunder in the Trust Indenture Estate as may
be specified from time to time in written instructions of a Majority in Interest
of Note Holders (which instructions may, by their terms, be operative only at a
future date and which shall be accompanied by the execution form of such
continuation statement so to be filed); provided that, notwithstanding the
foregoing, the Indenture Trustee may, but shall not be obligated to, execute and
file or cause to be filed any financing statement which it from time to time
deems appropriate or any continuation statement that the Lessee, in discharge of
its obligations under Section 3(v) of the Refunding Agreement or any other
Operative Document, may so request. Notwithstanding the foregoing or anything in
this Indenture to the contrary, the Indenture Trustee may, on the advice of its
counsel and without the consent or

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                                     - 68 -



approval of any Note Holder, approve any counsel asked to opine on any matters
under Section 11(b)(ii) of the Refunding Agreement, Section 6(a)(iii) of the
Lease or under this Indenture and approve any opinion issued by such counsel;
provided, however, that this provision will not interfere with the Owner
Participant's right to consent to such counsel. None of the Owner Participant,
the Owner Trustee or the Lessee have any liability for the failure of the
Indenture Trustee to discharge its obligations hereunder.

                  SECTION 5.03. Indemnification. The Indenture Trustee shall not
be required to take any action or refrain from taking any action under Section 
5.01 (other than the first sentence thereof) or 5.02 or Article IV hereof unless
the Indenture Trustee shall have been indemnified against any liability, cost or
expense (including counsel fees) that may be incurred in connection therewith.
The Indenture Trustee shall not be under any obligation to take any action under
this Indenture and nothing in this Indenture contained shall require the
Indenture Trustee to expend or risk its own funds or otherwise incur any
financial liability in the performance of any of its duties hereunder or in the
exercise of any of its rights or powers if it shall have reasonable grounds for
believing that repayment of such funds or adequate indemnity against such risk
or liability is not reasonably assured to it. The Indenture Trustee shall not be
required to take any action under Section 5.01 (other than the first sentence
thereof) or 5.02 or Article IV hereof, nor shall any other provision of this
Indenture be deemed to impose a duty on the Indenture Trustee to take any
action, if the Indenture Trustee shall have been advised by counsel that such
action is contrary to the terms hereof or of the other Indenture Documents or is
otherwise contrary to law.

                  SECTION 5.04. No Duties Except as Specified in Indenture or
Instructions. The Indenture Trustee shall not have any duty or obligation to
maintain, use, operate, store, lease, control, manage, sell, dispose of, insure
or otherwise deal with the Aircraft or any other part of the Trust Indenture
Estate, or to otherwise take or refrain from taking any action under, or in
connection with, this Indenture or any Indenture Document or any part of the
Trust Indenture Estate, except as expressly provided by the terms of this
Indenture or as expressly provided in written instructions from Note Holders as
provided in this Indenture and no implied duties or obligations shall be read
into this Indenture against the Indenture Trustee. It is understood that, as
between the Indenture Trustee and the Note Holders, with respect to all matters
left to the discretion of the Indenture Trustee hereunder, or under any
Indenture Document, the Indenture Trustee shall have the right to request
written instructions from the Note Holders and, pending receipt of such
instructions from the Note Holders or the required percentage thereof as
provided

                                 Trust Indenture
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                                     - 69 -



herein, the Indenture Trustee shall not be required to take any such
discretionary action hereunder; provided, however, that if the Indenture Trustee
shall request written instructions pursuant to this Section 5.04, it will use
reasonable efforts to seek and obtain such instructions promptly so as not
unreasonably to delay the proposed action of Lessee in respect of which the
instructions are sought. The Indenture Trustee agrees that it will in its
individual capacity and at its own cost and expense (but without any right of
indemnity in respect of any such cost or expense under Article VII hereof or any
other Operative Document) promptly take such action as may be necessary to duly
discharge all Lenders' Liens on any part of the Trust Indenture Estate
attributable to it in its individual capacity.

                  SECTION 5.05. No Action Except Under Lease, Refunding
Agreement, Indenture or Instructions. The Owner Trustee and the Indenture
Trustee agree that they will not use, operate, store, lease, control, manage,
sell, dispose of or otherwise deal with, or place Liens on, the Aircraft or any
other part of the Trust Indenture Estate except (i) as required or permitted by
the terms of the Lease or the Refunding Agreement, or (ii) in accordance with
the powers granted to, or the authority conferred upon, the Owner Trustee and
the Indenture Trustee pursuant to this Indenture and in accordance with the
terms hereof.

                  SECTION 5.06. Replacement Airframes, Replacement Engines and
Replacement Parts. (a) If at any time and from time to time, the Airframe or
Engine(s) may, or may be required to, be replaced under Section 6(a), 11(a),
11(b) or 16(c) of the Lease by a Replacement Airframe or Replacement Engine(s),
as the case may be, in accordance with the provisions of this Section 5.06 and
the provisions of said Sections of the Lease, the Owner Trustee shall, at such
time or times, but subject to compliance with the conditions to such replacement
set forth in the Lease, direct the Indenture Trustee to execute and deliver to
or as directed in writing by the Owner Trustee an appropriate instrument
releasing such Airframe and/or Engine(s) as appropriate from the Lien of this
Indenture and the Indenture Trustee shall execute and deliver such instrument as
aforesaid, but only upon receipt by or deposit with the Indenture Trustee of the
following:

         (1) A written request from the Owner Trustee, requesting such release
and specifically describing the Airframe and/or Engine(s) so to be released and
the Replacement Airframe and/or Replacement Engine(s).


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                                     - 70 -



         (2)      A certificate signed by a duly authorized officer of the 
Lessee stating the following:

                  A.       With respect to the replacement of any Airframe:

             (i) a description of the Airframe which shall be identified by
         manufacturer, model, FAA registration number (or other applicable
         registration number) and manufacturer's serial number;

             (ii) a description of the Replacement Airframe (including the
         manufacturer, model, FAA registration number (or other applicable
         registration number) and manufacturer's serial number) to be received
         as consideration for the Airframe to be released;

            (iii) that on the date of the Indenture Supplement relating to the
         Replacement Airframe the Owner Trustee will hold legal title to (or, if
         the Japanese Lease Agreement is then in effect, be the beneficial owner
         of) such Replacement Airframe free and clear of all Liens except
         Permitted Liens, that such Replacement Airframe will on such date be in
         good operating condition, and that such Replacement Airframe has been
         or, substantially concurrently with such replacement, is in the process
         of being duly registered with the Owner Trustee as owner thereof under
         the Federal Aviation Act or under the law then applicable to the
         registration of the Aircraft and that an airworthiness certificate has
         been duly issued under the Federal Aviation Act (or such other
         applicable law) with respect to such Replacement Airframe, and that
         such registration and certificate is in full force and effect, and the
         Lessee or a Permitted Sublessee will have the full right and authority
         to use such Replacement Airframe;

             (iv) that the insurance required by Section 12 of the Lease is in
         full force and effect with respect to such Replacement Airframe and all
         premiums then due thereon have been paid in full;

             (v)  that the Replacement Airframe is of a like Airbus A320-231 
         model airframe with equivalent or better modification status;

             (vi) that no Lease Event of Default has occurred and is continuing
         or would result from the making and granting of the request for release
         and the addition of a Replacement Airframe;

            (vii) an appraisal prepared in accordance with the Appraisal 
         Procedure (as defined in the Lease) confirms that

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         the Replacement Airframe has a value, utility and remaining useful life
         at least equal to that of the Airframe which suffered the Event of Loss
         assuming that the same were maintained in accordance with the
         requirements of the Lease whether or not they are in fact so
         maintained; and

           (viii) that each of the conditions specified in Section 11(a) and (c)
         of the Lease with respect to such Replacement Airframe have been
         satisfied.

                  B.       With respect to the replacement of any Engine:

             (i)  a description of the Engine which shall be identified by 
         manufacturer's name and serial number;

             (ii) a description of the Replacement Engine (including the 
         manufacturer's name and serial number) to be received as consideration
         for the Engine to be released;

            (iii) that on the date of the Indenture Supplement relating to the
         Replacement Engine the Owner Trustee will hold title to (or, if the
         Japanese Lease Agreement is then in effect, beneficial ownership of)
         such Replacement Engine free and clear of all Liens except Permitted
         Liens, that such Replacement Engine will on such date be in good
         operating condition, and that such Replacement Engine is the same or an
         improved model as the Engine to be released;

             (iv) the value, remaining useful life and utility of the
         Replacement Engine as of the date of such certificate (which value,
         remaining useful life and utility shall not be less than the then
         value, remaining useful life and utility of the Engine requested to be
         released, assuming such Engine was in the condition and repair required
         to be maintained under the Lease (but without regard to hours and
         cycles until overhaul));

             (v) that no Lease Event of Default has occurred and is
         continuing or would result from the making and granting of the request
         for release and the addition of such Replacement Engine; and

             (vi) that each of the conditions specified in Section 11(b) of the
         Lease with respect to such Replacement Engine have been satisfied.

         (3) The appropriate instrument or instruments (i) transferring to the
Owner Trustee title to (of, if the Japanese Lease Agreement is then in effect,
beneficial ownership of) the Replacement Airframe or Replacement Engine to be
received as consideration for the Airframe or Engine to be released, (ii)

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assigning to the Owner Trustee the benefit of all manufacturer's and vendor's
warranties generally available with respect to such Replacement Airframe or
Replacement Engine (if any) (which warranties may be assigned by the Owner
Trustee to Lessee pursuant to Section 5(d) of the Lease), and (iii) subjecting
such Replacement Airframe or Replacement Engine to the Lien of this Indenture
and to the Japanese Lease Agreement, if then in effect, and subjecting to any
relevant Assigned Sublease and Sublease Assignment, including, without
limitation, an Indenture Supplement.

          (4) With respect to a Replacement Airframe, an appraisal from BK 
Associates, Avmark Services Ltd., AeroEconomics, Inc. or another firm of
independent aircraft appraisers satisfactory to the Indenture Trustee confirming
the accuracy of the information set forth in Section 5.06(a)2.A(vii) hereof.

         (5)  The opinion of counsel to the Lessee satisfactory to the Indenture
Trustee, stating that:

                  (i) the certificates, opinions and other instruments and/or
         property that have been or are therewith delivered to and deposited
         with the Indenture Trustee conform to the requirements of this
         Indenture and the Lease and, upon the basis of such application, the
         property so sold or disposed of may be properly released from the Lien
         of this Indenture and all conditions precedent herein provided for
         relating to such release have been complied with;

             (ii) the Replacement Airframe and/or Replacement Engine(s) have
         been validly subjected to the Lien of this Indenture and covered by the
         Lease and the Japanese Lease Agreement, if then in effect, the
         instruments subjecting such Replacement Airframe or Replacement Engine
         to the Lien of this Indenture, the Lease and, the Japanese Lease
         Agreement, if then in effect, and subjecting to any relevant Assigned
         Sublease and Sublease Assignment, as the case may be, have been duly
         filed for recordation pursuant to the Federal Aviation Act or any other
         law then applicable to the registration of the Aircraft, and no further
         action, filing or recording of any document is necessary in order to
         establish and perfect, in the United States and, if the Aircraft is
         registered outside the United States, in the jurisdiction of
         registration, the legal title to (or, if the Japanese Lease Agreement
         is then in effect, the beneficial ownership of) the Owner Trustee to
         such Replacement Airframe and/or Replacement Engine and the Lien of
         this Indenture on such Replacement Airframe and/or Replacement Engine;
         and

            (iii)  the Owner Trustee and the Indenture Trustee (as assignee of 
         the Owner Trustee's rights under the Lease)

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         shall be entitled to the benefits of Section 1110 of the Bankruptcy
         Code with respect to the Replacement Airframe and, if an Event of Loss
         with respect to the Aircraft has occurred, the Replacement Engines to
         the same extent as with respect to the Airframe and Engines then
         installed thereon prior to such replacement.

                  (b) Upon the acquisition by the Owner Trustee of title to or
other interest in any Part under and as provided in the Lease, the same shall
automatically and without further act become subject to the Lien of this
Indenture, and to the extent the Owner Trustee is divested of title to or other
interest in any Part under and as provided in the Lease, the same shall
automatically and without further act cease to be subject to the Lien of this
Indenture. The Indenture Trustee shall at any time and from time to time at the
request of the Lessee execute an appropriate written instrument or instruments
to confirm the release of any Part from the Lien of this Indenture as provided
in this Section 5.06(b), but only upon receipt by the Indenture Trustee of an
Officers' Certificate of Lessee confirming such release is authorized by the
terms hereof.

                  SECTION 5.07. Indenture Supplements for Replacements. In the
event of the substitution of a Replacement Airframe or Engine as contemplated by
Section 11 of the Lease, the Owner Trustee and the Indenture Trustee agree for
the benefit of the Note Holders and the Lessee, subject to fulfillment of the
conditions precedent and compliance by the Lessee with its obligations set forth
in Section 11 of the Lease, to execute and deliver the appropriate instruments
as contemplated by Section 5.06 hereof, and execute and deliver to the Lessee
(or any relevant Permitted Sublessee) an appropriate instrument releasing the
Airframe and/or Engine(s) being replaced from the Lien of this Indenture.

                  SECTION 5.08. Effect of Replacement. In the event of the
substitution of a Replacement Airframe or Engine as contemplated by Section 11
of the Lease and Section 5.06 hereof, all provisions of this Indenture relating
to the Airframe or Engine(s) being replaced shall be applicable to such
Replacement Airframe or Replacement Engine(s) with the same force and effect as
if such Replacement Airframe or Replacement Engine(s) were the same airframe or
engine(s), as the case may be, as the Airframe or Engine(s) being replaced.

                  SECTION 5.09. Notices, etc. Where this Indenture expressly
provides for notice to Note Holders, such notice shall be sufficiently given
(unless otherwise herein expressly provided) if in writing and mailed,
first-class postage prepaid, to each Note Holder entitled thereto, at his last
address as it appears in the Register. In any case where notice to Note

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Holders is given by mail, neither the failure to mail such notice, nor any
defect in any notice so mailed, to any particular Note Holder shall affect the
sufficiency of such notice with respect to other Note Holders. Where this
Indenture provides for notice in any manner, such notice may be waived in
writing by the Person entitled to receive such notice, either before or after
the event, and such waiver shall be the equivalent of such notice. Waivers of
notice by Note Holders shall be filed with the Indenture Trustee, but such
filing shall not be a condition precedent to the validity of any action taken in
reliance upon such waiver.

                  In case, by reason of the suspension of or irregularities in
regular mail service, it shall be impracticable to mail notice to the Note
Holders when such notice is required to be given pursuant to any provision of
this Indenture, then any manner of giving such notice as shall be satisfactory
to the Indenture Trustee shall be deemed to be a sufficient giving of such
notice.

                  SECTION 5.10. Certain Rights of Owner Trustee and Owner
Participant. Notwithstanding any other provisions of this Indenture, including
the Granting Clause, but subject always to the final paragraph of this Section 
5.10, the following rights shall be reserved to the Owner Trustee or Owner
Participant, as the case may be (as separate and independent rights) to the
extent described herein:

                  (a) the Owner Trustee or the Owner Participant may, without
         the consent of the Indenture Trustee, demand, collect, sue for or
         otherwise obtain all amounts included in Excepted Payments from the
         Lessee, exercise any election or option or make any decision or
         determination or give or receive any notice, consent, waiver or
         approval in respect of any Excepted Payment and seek legal or equitable
         remedies to require the Lessee to maintain the insurance coverage
         referred to in Section 12 of the Lease (or the comparable provisions of
         any Assigned Sublease) and such specific performance of the covenants
         of the Lessee under the Lease (or the comparable provisions of any
         Assigned Sublease) relating to the protection, maintenance, possession
         and use of the Aircraft; provided, that the rights referred to in this
         clause (a) shall not be deemed to include the exercise of any remedies
         provided for in Section 18 of the Lease (or the comparable provisions
         of any Assigned Sublease) other than the right to proceed by
         appropriate court action, either at law or in equity, to enforce
         payment by the Lessee of such amounts included in Excepted Payments or
         performance by the Lessee of such insurance covenant or to recover
         damages for the breach thereof or for specific performance of any
         covenant of the Lessee;

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                  (b) unless an Indenture Event of Default and an Indenture
         Trustee Event shall have occurred and be continuing, the Indenture
         Trustee shall not, without the consent of the Owner Trustee, which
         consent shall not be withheld if no right or interest of the Owner
         Trustee or the Owner Participant shall be materially diminished or
         impaired thereby, (i) enter into, execute and deliver amendments,
         modifications, waivers or consents in respect of any of the provisions
         of the Lease, any Assigned Sublease or any Sublease Assignment, or (ii)
         approve any accountants, engineers, appraisers or counsel as
         satisfactory to render services for or issue opinions to the Owner
         Trustee pursuant to the Operative Documents; provided that, whether or
         not an Indenture Event of Default has occurred and is continuing, the
         Owner Trustee's consent shall be required with respect to any
         amendments, modifications, waivers or consents in respect of any of the
         provisions of Sections 6, 12 or 16 of the Lease, or of any other
         Section of the Lease to the extent such action shall affect (y) the
         amount or timing of, or the right to enforce payment of any Excepted
         Payment or (z) the amount or timing of any amounts payable by the
         Lessee under the Lease as originally executed (or as subsequently
         modified with the consent of the Owner Trustee) which, absent the
         occurrence and continuance of an Indenture Event of Default hereunder,
         would be distributable to the Owner Trustee under Article III hereof;

                  (c) at all times whether or not an Indenture Event of Default
         has occurred and is continuing, the Owner Trustee and the Owner
         Participant shall have the right, together with the Indenture Trustee,
         (i) to receive from the Lessee or any Permitted Sublessee all notices,
         certificates, reports, filings, opinions of counsel and other documents
         and all information which any thereof is permitted or required to give
         or furnish to the Owner Trustee pursuant to any Operative Document
         (including pursuant to Section 10 of the Lease), (ii) to exercise
         inspection rights pursuant to Section 7 of the Lease, (iii) to retain
         all rights with respect to insurance maintained for its own account
         which Section 12 of the Lease specifically confers on the Owner
         Participant and (iv) to exercise, to the extent necessary to enable it
         to exercise its rights under Section 4.03 hereof, the rights of the
         Owner Trustee under Section 21(d) of the Lease and to give notices of
         default under Section 17 of the Lease; and

                  (d) except as expressly provided to the contrary in clauses
         (a), (b) and (c) above, so long as no Indenture Event of Default has
         occurred and is continuing, all rights (including options, elections,
         determinations, consents, approvals, waivers and the giving of notices)
         of the Owner

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                                     - 76 -



         Trustee and the Owner Participant under the Lease shall be exercised by
         the Owner Trustee and/or the Owner Participant, as the case may be, to
         the exclusion of the Indenture Trustee and any Note Holder and without
         the consent of the Indenture Trustee or any Note Holder; provided that
         the foregoing shall not, nor shall any other provision of this Section 
         5.10, limit (A) any rights separately and expressly granted to the
         Indenture Trustee or any Note Holder under the Lease or the other
         Operative Documents (including, without limitation, Section 15 of the
         Refunding Agreement) or (B) the right of the Indenture Trustee or any
         Note Holder to receive any funds to be delivered to the Owner Trustee
         under the Lease (except with respect to Excepted Payments).

                  Notwithstanding the foregoing provisions of this Section 5.10,
but subject always to Section 10.05 hereof and to the rights of the Owner
Participant under Sections 2.12 and 4.03 hereof, the Indenture Trustee shall at
all times have the right, to the exclusion of the Owner Trustee and the Owner
Participant, to (A) demand, collect, sue for or otherwise receive and enforce
the payment of all Rent due and payable under the Lease (other than any thereof
constituting an Excepted Payment), (B) declare the Lease to be in default under
Section 18 thereof and (C) subject only to the provisions of Sections 4.03 and
4.04(a) hereof, exercise the remedies set forth in such Section 18 (other than
in connection with Excepted Payments) and in Article IV hereof.

                  SECTION 5.11. Evidence of Action Taken by Note Holder. Any
request, demand, authorization, direction, notice, consent, waiver or other
action provided by this Indenture to be given or taken by Note Holders may be
embodied in and evidenced by one or more instruments of substantially similar
tenor signed by such Note Holders in person or by agent duly appointed in
writing, and, except as herein otherwise expressly provided, such action shall
become effective when such instrument or instruments are delivered to the
Indenture Trustee and, if expressly required herein, to the Owner Trustee. Proof
of execution of any instrument or of a writing appointing any such agent shall
be sufficient for any purpose of this Indenture and (subject to Sections 5.04,
5.05, 6.02 and 6.05) conclusive in favor of the Indenture Trustee and the Owner
Trustee if made in the manner provided in this Indenture.

                  SECTION 5.12. Right of Revocation of Action Taken. At any time
prior to (but not after) the evidencing to the Indenture Trustee, as provided in
Section 5.11 hereof, of the taking of any action by the Note Holders of the
percentage in aggregate Principal Amount of the Equipment Notes specified in
this Indenture in connection with such action, any Note Holder which has
consented to such action may, by filing written notice at the

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                                     - 77 -



Corporate Trust Office and upon proof of holding an Equipment Note, revoke such
action so far as concerns such Equipment Note. Except as aforesaid any such
action taken by the Note Holder shall be conclusive and binding upon such Note
Holder and upon all future Note Holders and owners of such Equipment Note and of
any Equipment Notes issued in exchange or substitution therefor, irrespective of
whether or not any notation in regard thereto is made upon any such Equipment
Note. Any action taken by the Note Holders of the percentage in aggregate
Principal Amount of the Equipment Notes specified in this Indenture in
connection with such action shall be conclusively binding upon the Owner
Trustee, the Indenture Trustee and the Note Holders.


                                   ARTICLE VI

                   THE OWNER TRUSTEE AND THE INDENTURE TRUSTEE

                  SECTION 6.01. Acceptance of Trusts and Duties. The Indenture
Trustee in its individual capacity accepts the trust hereby created and agrees
to perform the same but only upon the terms of this Indenture. The Indenture
Trustee agrees for the benefit of the Note Holders, the Owner Trustee and the
Owner Participant to receive and disburse all moneys constituting part of the
Trust Indenture Estate in accordance with the terms hereof; and neither the
Trust Company nor the Indenture Trustee shall be answerable or accountable under
any circumstances, except for their own willful misconduct or gross negligence
(other than for the handling of funds, for which the standard of accountability
shall be negligence), or as provided in the fourth sentence of Section 2.04(a)
hereof and in the last sentence of Section 5.04 hereof, and except for
liabilities that may result, in the case of the Trust Company, from the
inaccuracy of any representation or warranty of the Trust Company in the
Refunding Agreement or in the Trust Agreement or in Section 6.03 hereof or the
failure to perform any covenant of the Trust Company pursuant to Section 4.01(a)
hereof or in the Trust Agreement, the Refunding Agreement, or, in the case of
the Indenture Trustee, from the inaccuracy of any representation or warranty, or
failure to perform any covenant, of the Indenture Trustee made in its individual
capacity herein, in the Refunding Agreement or in any other document. None of
the Owner Participant, the Trust Company or the Indenture Trustee shall be
liable for any action or inaction of any other one of such parties, except, in
the case of the Owner Participant, for any action or omission of the Owner
Trustee performed or omitted on the instructions of the Owner Participant. The
Owner Trustee shall not be deemed a trustee for the Note Holders for any
purpose.

                  SECTION 6.02.  Absence of Duties.  In the case of the
Indenture Trustee, except in accordance with written instructions

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furnished pursuant to Section 5.01, 5.02 or 9.01 hereof, and except as provided
in, and without limiting the generality of, Sections 5.03, 5.04 and 6.09 hereof
and, in the case of the Owner Trustee, except as provided in Section 4.01(b),
6.09 or 9.01 hereof and in the Trust Agreement, the Lease and the Refunding
Agreement, the Owner Trustee and the Indenture Trustee shall have no duty (i) to
see to any registration of the Aircraft or any recording or filing of the Lease
or of this Indenture or any other document, or to see to the maintenance of any
such registration, recording or filing, (ii) to see to any insurance on the
Aircraft, whether or not the Lessee shall be in default with respect thereto,
(iii) to see to the payment or discharge of any Lien of any kind against any
part of the Trust Estate or the Trust Indenture Estate, (iv) to confirm, verify
or inquire into the failure to receive any financial statements of the Lessee or
(v) to inspect the Aircraft at any time or ascertain or inquire as to the
performance or observance of any of the Lessee's covenants under the Lease or
any of the Permitted Sublessee's covenants under any Assigned Sublease with
respect to the Aircraft.

                  SECTION 6.03. No Representations or Warranties as to Aircraft
or Documents. NEITHER THE INDENTURE TRUSTEE (INDIVIDUALLY OR AS INDENTURE
TRUSTEE) NOR THE OWNER TRUSTEE NOR THE TRUST COMPANY MAKES OR SHALL BE DEEMED TO
HAVE MADE, AND EACH HEREBY EXPRESSLY DISCLAIMS, ANY REPRESENTATION OR WARRANTY,
EXPRESS OR IMPLIED, AS TO THE TITLE (EXCEPT AS SET FORTH IN SECTION 5(a) OF THE
LEASE), AIRWORTHINESS, VALUE, WORKMANSHIP, COMPLIANCE WITH SPECIFICATIONS,
CONDITION, DESIGN, QUALITY, DURABILITY, OPERATION, MERCHANTABILITY OR FITNESS
FOR USE OR PURPOSE OF THE AIRCRAFT OR ANY ENGINE OR ANY PART THEREOF, AS TO THE
ABSENCE OF LATENT OR OTHER DEFECTS, WHETHER OR NOT DISCOVERABLE, AS TO THE
ABSENCE OF ANY INFRINGEMENT OF ANY PATENT, TRADEMARK OR COPYRIGHT, AS TO THE
ABSENCE OF OBLIGATIONS BASED ON STRICT LIABILITY IN TORT, OR ANY OTHER
REPRESENTATION OR WARRANTY WITH RESPECT TO THE AIRCRAFT OR ANY ENGINE, except
that the Trust Company warrants that (i) on the Delivery Date for the Aircraft
the Owner Trustee shall have received whatever interest in the Aircraft was
conveyed to it under the Japanese Lease Agreement and the Second Japanese Lease
Assignment subject to the rights of the parties to the Indenture Documents and
(ii) the Aircraft shall be free and clear of Lessor's Liens attributable to the
Trust Company. Neither the Trust Company nor the Indenture Trustee makes or
shall be deemed to have made any representation or warranty as to the validity,
legality or enforceability of this Indenture, the Trust Agreement, the Equipment
Notes or any Indenture Documents or as to the correctness of any statement
contained in any thereof, except for the representations and warranties of the
Trust Company and the Indenture Trustee in its individual capacity or as
Indenture

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Trustee made under this Indenture or in the other Operative Documents.

                  SECTION 6.04. No Segregation of Moneys; No Interest. Any
moneys paid to or retained by the Indenture Trustee pursuant to any provision
hereof and not then required to be distributed to any Note Holder, the Lessee or
the Owner Trustee as provided in Article III hereof need not be segregated in
any manner except to the extent required by law, and may be deposited under such
general conditions as may be prescribed by law, and the Indenture Trustee shall
not (except as otherwise provided in Section 3.07 hereof) be liable for any
interest thereon; provided that any payments received or applied hereunder by
the Indenture Trustee shall be accounted for by the Indenture Trustee so that
any portion thereof paid or applied pursuant hereto shall be identifiable as to
the source thereof.

                  SECTION 6.05. Reliance; Agents; Advice of Counsel. Neither the
Owner Trustee nor the Indenture Trustee shall incur any liability to anyone in
acting upon any signature, instrument, notice, resolution, request, consent,
order, certificate, report, opinion, bond or other document or paper believed by
it to be genuine and believed by it to be signed by the proper party or parties.
The Owner Trustee and the Indenture Trustee may accept a copy of a resolution of
the Board of Directors of any party to the Refunding Agreement, certified by the
Secretary or an Assistant Secretary thereof as duly adopted and in full force
and effect, as conclusive evidence that such resolution has been duly adopted
and that the same is in full force and effect. As to the aggregate unpaid
Principal Amount of Equipment Notes outstanding as of any date, the Owner
Trustee may for all purposes hereof rely on a certificate signed by any Vice
President or other authorized corporate trust officer of the Indenture Trustee.
As to any fact or matter relating to the Lessee the manner of ascertainment of
which is not specifically described herein, the Owner Trustee and the Indenture
Trustee may for all purposes hereof rely on a certificate, signed by a duly
authorized officer of the Lessee, as to such fact or matter, and such
certificate shall constitute full protection to the Owner Trustee and the
Indenture Trustee for any action taken or omitted to be taken by them in good
faith in reliance thereon, but in the case of any such certificate, the Owner
Trustee and the Indenture Trustee shall be under a duty to examine the same to
determine whether or not it conforms to the requirements of this Indenture. The
Indenture Trustee shall assume, and shall be fully protected in assuming, that
the Owner Trustee is authorized by the Trust Agreement to enter into this
Indenture and to take all action to be taken by it pursuant to the provisions
hereof, and shall not inquire into the authorization of the Owner Trustee with
respect thereto. In the administration of the trusts hereunder, the Owner
Trustee and the Indenture Trustee each may execute any of

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the trusts or powers hereof and perform its powers and duties hereunder directly
or through agents or attorneys and, except that any such execution or
performance shall not derogate from the Indenture Trustee's obligations under
the third sentence of Section 2.04(a), the Indenture Trustee and the Owner
Trustee shall not be responsible for any misconduct or negligence on the part of
any such agent or attorney appointed with due care hereunder. The Indenture
Trustee may, at the expense of the Trust Indenture Estate, consult with counsel,
accountants and other skilled Persons to be selected and retained by it, and the
Owner Trustee and the Indenture Trustee shall not be liable for anything done,
suffered or omitted in good faith by them in accordance with the written advice
or written opinion of any such counsel, accountants or other skilled Persons.

                  SECTION 6.06. Capacity in Which Acting. The Owner Trustee acts
hereunder solely as trustee under the Trust Agreement provided, and not in its
individual capacity, except as otherwise expressly provided herein.

                  SECTION 6.07. Compensation. The Indenture Trustee shall be
entitled to reasonable compensation (which compensation shall not (to the extent
permitted by applicable law) be limited by any provision of law in regard to the
compensation of a trustee of an express trust), including expenses, advances and
disbursements, for all services rendered hereunder, and shall have a first
priority claim (prior to the Note Holders) on the Trust Indenture Estate for the
payment of such compensation, to the extent that such compensation shall not be
paid by the Lessee, and shall have the right to use or apply any moneys held by
it hereunder in the Trust Indenture Estate toward such payments. The Indenture
Trustee agrees that it shall have no right against any Note Holder or the Owner
Participant for any fee as compensation for its services as trustee under this
Indenture.

                  SECTION 6.08. May Become Note Holder. Each of the institutions
acting as Owner Trustee and Indenture Trustee hereunder may become a Note Holder
and have all rights and benefits of a Note Holder to the same extent as if it
were not the institution acting as Owner Trustee or Indenture Trustee, as the
case may be.

                  SECTION 6.09. Further Assurances; Financing Statements. At any
time and from time to time, upon the request of the Indenture Trustee, the Owner
Trustee shall promptly and duly execute and deliver any and all such further
instruments and documents as may be specified in such request and as are
necessary or desirable to perfect, preserve or protect the mortgage, security
interests and assignments created or intended to be created hereby, or to obtain
for the Indenture Trustee the

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                                     - 81 -



full benefit of the specific rights and powers herein granted, including,
without limitation, the execution and delivery of Uniform Commercial Code
financing statements and continuation statements with respect thereto, or
similar instruments relating to the perfection of the mortgage, security
interests or assignments created or intended to be created hereby.


                                   ARTICLE VII

              INDEMNIFICATION OF INDENTURE TRUSTEE BY OWNER TRUSTEE

                  SECTION 7.01. Scope of Indemnification. The Owner Trustee, not
individually but solely in its capacity as owner trustee under the Trust
Agreement, hereby agrees, whether or not any of the transactions contemplated
hereby shall be consummated but except as otherwise provided in Section 2.03
hereof, to assume liability for, and does hereby indemnify, protect, save and
keep harmless the Indenture Trustee, in its individual capacity and as Indenture
Trustee, and its successors, permitted assigns, agents and servants solely from
the Trust Estate, from and against any and all liabilities, obligations, losses,
damages, penalties, taxes (excluding any taxes payable by the Indenture Trustee
on or measured by any compensation received by the Indenture Trustee for its
services under this Indenture), claims, actions, suits, and reasonable
out-of-pocket costs, expenses or disbursements (including reasonable legal fees
and expenses) of any kind and nature whatsoever which may be imposed on,
incurred by or asserted against the Indenture Trustee from and after the
Restatement Date (whether or not also agreed to be indemnified against by any
other Person under any other document) in any way relating to or arising out of
this Indenture, the Trust Agreement, the Equipment Notes, the other Indenture
Documents or the enforcement of any of the terms of any thereof, or in any way
relating to or arising out of the manufacture, purchase, acceptance,
nonacceptance, rejection, ownership, delivery, lease, sublease, possession, use,
operation, condition, sale, return or other disposition of the Aircraft or any
Engine (including, without limitation, latent and other defects, whether or not
discoverable, and any claim for patent, trademark or copyright infringement), or
in any way relating to or arising out of the administration of the Trust
Indenture Estate or the action or inaction of the Indenture Trustee hereunder,
except only (i) in the case of willful misconduct or gross negligence (or
negligence in the case of handling of funds) of the Indenture Trustee in the
performance of its duties hereunder, (ii) as may result from the inaccuracy of
any representation or warranty of the Indenture Trustee made in the Refunding
Agreement, (iii) as otherwise provided in Section 2.04(a) hereof or in the last
sentence of Section 5.04 hereof or (iv) as otherwise excluded by the terms of
Sections 10(b) and 13 of the Lease from the Lessee's

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                                     - 82 -



indemnities to the Indenture Trustee, in its individual capacity and as
Indenture Trustee, and its successors, permitted assigns, agents and servants,
thereunder; provided that so long as the Lease is in effect, the Indenture
Trustee shall not make any claim under this Section 7.01 for any amount
indemnified against by the Lessee under the Lease without first (but only to the
extent not stayed or otherwise prevented by operation of law) making demand on
the Lessee for payment of such amount. The Indenture Trustee shall notify the
Owner Trustee and the Lessee promptly of any claim for which it may seek
indemnity. The Lessee shall be entitled to defend any claim by the Indenture
Trustee to the extent provided in Section 10 or 13 of the Lease. The Indenture
Trustee shall be entitled to indemnification from the Trust Indenture Estate for
any liability, obligation, loss, damage, penalty, claim, action, suit, cost,
expense or disbursement indemnified against pursuant to this Section 7.01 to the
extent not reimbursed by the Lessee or others, but without releasing any of them
from their respective agreements of reimbursement; and to secure the same the
Indenture Trustee shall have a prior Lien on the Trust Indenture Estate. The
indemnities contained in this Section 7.01 shall survive the termination of this
Indenture.

                  SECTION 7.02. Exculpation and Release of Liability. Without in
any way affecting the limitations on liability set forth in the Operative
Documents, the Indenture Trustee, and each Note Holder by accepting any
Equipment Note hereunder, hereby acknowledge and agree that none of the Trust
Company, the Owner Participant or any director, officer, employee, stockholder,
agent or affiliate of the Trust Company or the Owner Participant (the
"Exculpated Equity Persons") shall have any obligation, duty or liability of any
kind whatsoever to the Indenture Trustee or any such Note Holder in connection
with the exercise by any Exculpated Equity Person of any rights of the Owner
Trustee or the taking of any action or the failure to take any action by any
Exculpated Equity Person in connection with any rights of the Owner Trustee
under this Indenture or the Lease, and each such Note Holder hereby waives and
releases, to the extent permitted by applicable law, each Exculpated Equity
Person of any and all such obligations, duties or liabilities.


                                  ARTICLE VIII

                    SUCCESSOR TRUSTEES AND SEPARATE TRUSTEES

                  SECTION 8.01. Notice of Successor Owner Trustee. In the case
of any appointment of a successor to the Owner Trustee pursuant to the Trust
Agreement or any merger, conversion, consolidation or sale of substantially all
of the corporate trust business of the Trust Company pursuant to the Trust
Agreement,

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the successor Owner Trustee shall give prompt written notice thereof to the
Indenture Trustee and to each Note Holder.

                  SECTION 8.02. Resignation and Removal of Indenture Trustee;
Appointment of Successor. (a) The Indenture Trustee or any successor thereto may
resign at any time without cause by giving at least 30 calendar days' prior
written notice to the Owner Trustee, the Owner Participant, each Note Holder and
the Lessee, such resignation to be effective upon the acceptance of the
trusteeship by a successor Indenture Trustee. In addition, a Majority in
Interest of Note Holders may at any time remove the Indenture Trustee without
cause by an instrument in writing delivered to the Owner Trustee, the Lessee and
the Indenture Trustee, and the Indenture Trustee shall promptly notify each Note
Holder thereof in writing, such removal to be effective upon the acceptance of
the trusteeship by a successor Indenture Trustee. In the case of the resignation
or removal of the Indenture Trustee, a Majority in Interest of Note Holders may
appoint, with the consent of the Lessee, a successor Indenture Trustee by an
instrument signed by such Holders (whose fees shall be reasonably acceptable to
the Lessee). If a successor Indenture Trustee shall not have been appointed
within 30 calendar days after such notice of resignation or removal, the
Indenture Trustee, any Note Holder, the Owner Trustee, the Lessee or the Owner
Participant may apply to any court of competent jurisdiction to appoint a
successor Indenture Trustee to act until such time, if any, as a successor shall
have been appointed as above provided. The successor Indenture Trustee so
appointed by such court shall immediately and without further act be superseded
by any successor Indenture Trustee appointed as above provided within one year
from the date of the appointment by such court.

                  (b) Any successor Indenture Trustee, however appointed, shall
execute and deliver to the Owner Trustee and to the predecessor Indenture
Trustee an instrument accepting and assuming such appointment, and thereupon the
resignation or removal of the retiring Trustee shall become effective and such
successor Indenture Trustee, without further act, shall become vested with and
bound by all the estates, properties, rights, powers, duties and obligations of
the predecessor Indenture Trustee hereunder and under the other Indenture
Documents in the trusts hereunder applicable to it with like effect as if
originally named the Indenture Trustee herein; but nevertheless upon the written
request of such successor Indenture Trustee, such predecessor Indenture Trustee
shall execute and deliver an instrument transferring to such successor Indenture
Trustee, upon the trusts herein expressed applicable to it, all the estates,
properties, rights and powers of such predecessor Indenture Trustee, and such
predecessor Indenture Trustee shall duly assign, transfer, deliver and pay over
to such successor

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                                     - 84 -



Indenture Trustee all moneys or other property then held by such predecessor
Indenture Trustee hereunder, subject nevertheless to its claim provided for in
Section 6.07 hereof.

                  (c) Any successor Indenture Trustee, however appointed, shall
be a "citizen of the United States" within the meaning of Section 40102(a)(15)
of the Federal Aviation Act and shall also be a bank or trust company having a
combined capital and surplus of at least $200,000,000 if there be such an
institution willing, able and legally qualified to perform the duties of the
Indenture Trustee hereunder upon reasonable or customary terms.

                  (d) Any corporation into which the Indenture Trustee may be
merged or converted or with which it may be consolidated, or any corporation
resulting from any merger, conversion or consolidation to which the Indenture
Trustee shall be a party, or any corporation to which substantially all the
corporate trust business of the Indenture Trustee may be transferred, shall,
subject to the terms of paragraph (c) of this Section 8.02, be the Indenture
Trustee under this Indenture without further act. Notwithstanding the foregoing,
upon the request of the Owner Trustee or the Lessee, any such successor
corporation referred to in this Section 8.02(d) shall deliver to the Owner
Trustee and the Lessee an instrument confirming its status as the Indenture
Trustee hereunder and under the other Indenture Documents.

                  SECTION 8.03.  Appointment of Separate Trustees. (a)
 At any time or times, for the purpose of meeting any legal
requirements of any jurisdiction in which any part of the Trust Indenture Estate
may at the time be located or in which any action of the Indenture Trustee may
be required to be performed or taken, the Indenture Trustee, by an instrument in
writing signed by it, may appoint one or more individuals or corporations to act
as separate trustee or separate trustees or co-trustee, acting jointly with the
Indenture Trustee, of all or any part of the Trust Indenture Estate to the full
extent that local law makes it necessary for such separate trustee or separate
trustees or co-trustee acting jointly with the Indenture Trustee to act.

                  (b) The Indenture Trustee and, at the request of the Indenture
Trustee, the Owner Trustee, shall execute, acknowledge and deliver all such
instruments as may be required by the legal requirements of any jurisdiction or
by any such separate trustee or separate trustees or co-trustee for the purpose
of more fully confirming such title, rights or duties to such separate trustee
or separate trustees or co-trustee. Upon the acceptance in writing of such
appointment by any such separate trustee or separate trustees or co-trustee, it,
he, she or they shall be vested with such title to the Trust Indenture Estate or
any part thereof, and with such rights and duties, as shall be specified

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                                     - 85 -



in the instrument of appointment, jointly with the Indenture Trustee (except
insofar as local law makes it necessary for any such separate trustee or
separate trustees to act alone) subject to all the terms of this Indenture. Any
separate trustee or separate trustees or co-trustee may, at any time by an
instrument in writing, constitute the Indenture Trustee its, his or her
attorney-in-fact and agent with full power and authority to do all acts and
things and to exercise all discretion on its, his or her behalf and in its, his
or her name. In case any such separate trustee or co-trustee shall die, become
incapable of acting, resign or be removed, the title to the Trust Indenture
Estate and all assets, property, rights, powers, trusts, obligations and duties
of such separate trustee or co-trustee shall, so far as permitted by law, vest
in and be exercised by the Indenture Trustee, without the appointment of a
successor to such separate trustee or co-trustee unless and until a successor is
appointed.

                  (c) All provisions of this Indenture which are for the benefit
of the Indenture Trustee shall extend to and apply to each separate trustee or
co-trustee appointed pursuant to the foregoing provisions of this Section 8.03,
including without limitation Article VII hereof.

                  (d) Every additional trustee and separate trustee hereunder
shall, to the extent permitted by law, be appointed and act, and the Indenture
Trustee shall act, subject to the following provisions and conditions:

                  (i) all powers, duties, obligations and rights conferred upon
         the Indenture Trustee in respect of the receipt, custody, investment
         and payment of moneys shall be exercised solely by the Indenture
         Trustee;

             (ii) all other rights, powers, duties and obligations conferred or
         imposed upon the Indenture Trustee shall be conferred or imposed and
         exercised or performed by the Indenture Trustee and such additional
         trustee or trustees and separate trustee or trustees jointly except to
         the extent that under any law of any jurisdiction in which any
         particular act or acts are to be performed, the Indenture Trustee shall
         be incompetent or unqualified to perform such act or acts, in which
         event such rights, powers, duties and obligations (including the
         holding of title to the Trust Indenture Estate in any such
         jurisdiction) shall be exercised and performed by such additional
         trustee or trustees or separate trustee or trustees;

            (iii) no power hereby given to, or with respect to which it is
         hereby provided may be exercised by, any such additional trustee or
         separate trustee shall be exercised

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                                     - 86 -



         hereunder by such additional trustee or separate trustee
         except jointly with, or with the consent of, the Indenture
         Trustee; and

             (iv)   no trustee hereunder shall be personally liable by reason 
         of any act or omission of any other trustee hereunder.

If at any time the Indenture Trustee shall deem it no longer necessary or
prudent in order to conform to any such law, the Indenture Trustee shall execute
and deliver an indenture supplemental hereto and all other instruments and
agreements necessary or proper to remove any additional trustee or separate
trustee.

                  (e) Any request, approval or consent in writing by the
Indenture Trustee to any additional trustee or separate trustee shall be
sufficient warrant to such additional trustee or separate trustee, as the case
may be, to take such action as may be so requested, approved or consented to.

                  (f) Notwithstanding any other provision of this Section 8.03,
the powers of any additional trustee or separate trustee appointed pursuant to
this Section 8.03 shall not in any case exceed those of the Indenture Trustee
hereunder.


                                   ARTICLE IX

                       SUPPLEMENTS AND AMENDMENTS TO THIS
                          INDENTURE AND OTHER DOCUMENTS

                  SECTION 9.01. Lease Amendments and Supplemental Indentures.
(a) Except as otherwise provided in Section 5.10 hereof, and except with respect
to Excepted Payments, the Owner Trustee agrees that it shall not enter into any
amendment of or supplement to the Lease or any of the Japanese Financing
Documents, or execute and deliver any written waiver or modification of, or
consent under, the terms of the Lease or any of the Japanese Financing
Documents, unless such supplement, amendment, waiver, modification or consent is
consented to in writing by the Indenture Trustee acting on instructions of a
Majority in Interest of Note Holders. Anything to the contrary contained in this
Section 9.01 notwithstanding, without the necessity of the consent of any of the
Note Holders or (as respects clauses (i) and (ii) below) the Indenture Trustee,
(i) any Excepted Payments payable to the Owner Trustee or Owner Participant may
be modified, amended, changed or waived in such manner as shall be agreed to by
the Owner Participant and Lessee, (ii) the Owner Trustee and Lessee may, so long
as no Indenture Event of Default has occurred and is continuing, enter into

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amendments of or additions to the Lease to modify Sections 6(d), 9 and 16 and
Exhibits B and E (except to the extent that such amendment would adversely
affect the rights or exercise of remedies under Section 18 of the Lease) so long
as such amendments, modifications and changes do not and would not (A) affect
the time of, or reduce the amount of, Basic Rent or Stipulated Loss Value
payments until after the payment in full of all Secured Obligations, (B) impair
the Lien of this Indenture, (C) adversely affect the value, utility or useful
life of the Aircraft or any Engine or (D) otherwise adversely affect the Note
Holders in any material respect, and (iii) the Lessee may effect the
re-registration of the Aircraft in accordance with but always subject to the
terms and conditions applicable thereto specified in Section 11 of the Refunding
Agreement and Section 6(e) of the Lease and the Indenture Trustee may approve
any Permitted Sublessee as provided in clause (c) of the definition of such term
set forth in the Lease and may exercise the rights of the Indenture Trustee
under Section 15 of the Refunding Agreement. For the avoidance of doubt, nothing
in this Section 9.01 shall limit in any way the rights of the Owner Trustee
and/or the Owner Participant under Section 5.10(d) to exercise certain rights
and powers under the Lease to the exclusion of the Indenture Trustee and any
Note Holder and without the consent of the Indenture Trustee or any Note Holder.

                  The Indenture Trustee is hereby authorized to join in the
execution of any supplemental indenture, to make any further appropriate
agreements and stipulations which may be therein contained and to accept the
conveyance, transfer, assignment, mortgage or pledge of any property thereunder,
but the Indenture Trustee shall not be obligated to enter into any such
supplemental indenture which adversely affects the Indenture Trustee's own
rights, duties or immunities under this Indenture or otherwise, whether in its
official or individual capacity.

                  Any supplemental indenture authorized by the provisions of
this Section 9.01 may be executed without the consent of the Note Holders
notwithstanding any of the provisions of this Section 9.01.

                  (b) Without limiting the provisions of Section 9.01(a) hereof
and subject to Sections 5.10(b) and 5.10(d) hereof, the Indenture Trustee agrees
with the Note Holders that it shall not enter into any amendment, waiver or
modification of, supplement or consent to this Indenture, the Lease, the
Refunding Agreement or the other Indenture Documents, any of the Japanese
Financing Documents or any other agreement included in the Trust Indenture
Estate, unless such supplement, amendment, waiver, modification or consent is
consented to in writing by a Majority in Interest of Note Holders, or does not
adversely affect the Note Holders in any material respect. Upon the written
request of a Majority in

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                                     - 88 -



Interest of Note Holders, the Indenture Trustee shall from time to time enter
into any such supplement or amendment, or execute and deliver any such waiver,
modification or consent, as may be specified in such request and as may be (in
the case of any such amendment, supplement or modification), to the extent such
agreement is required, agreed to by the Owner Trustee and Lessee or, as may be
appropriate, the Manufacturer; provided, however, that, without the consent of
each Holder of an affected Equipment Note then outstanding and of each Liquidity
Provider, no such amendment of or supplement to this Indenture, the Lease, the
Refunding Agreement or any other Indenture Document or waiver or modification of
the terms of, or consent under, any thereof, shall (i) modify any of the
provisions of this Section 9.01, or of Section 2.02, 2.10, 2.13, 4.02, 4.04(e),
5.06 or 5.10 hereof, Section 17 (except to add a Lease Event of Default) of the
Lease, the definitions of "Indenture Event of Default", "Indenture Default",
"Indenture Trustee Event", "Lease Event of Default", "Lease Default", "Majority
in Interest of Note Holders", "Make-Whole Amount" or "Note Holder", or the
percentage of Note Holders required to take or approve any action hereunder,
(ii) reduce the amount, or change the time of payment or method of calculation
of any amount, of Principal Amount, Make-Whole Amount, if any, or interest with
respect to any Equipment Note, or alter or modify the provisions of Article III
hereof with respect to the order of priorities in which distribution thereunder
shall be made as among the Note Holders, the Owner Trustee and the Lessee, (iii)
reduce, modify or amend any indemnities in favor of the Note Holders, (iv)
consent to any change in this Indenture or the Lease which would permit
redemption of Equipment Notes earlier than permitted under Section 2.10 hereof,
(v) modify any of the provisions of Section 4(b) of the Lease, or modify, amend
or supplement the Lease, any Assigned Sublease or any Sublease Assignment, or
consent to any assignment of any thereof, in either case releasing the Lessee
(or Permitted Sublessee) from its obligations in respect of the payment of Basic
Rent or Stipulated Loss Value for the Aircraft or altering the absolute and
unconditional character of the obligations of Lessee to pay Rent as set forth in
Sections 4(b) and 4(d) of the Lease (or comparable provisions in any Assigned
Sublease) or (vi) permit the creation of any Lien on the Trust Indenture Estate
or any part thereof other than Permitted Liens or deprive any Note Holder of the
benefit of the Lien of this Indenture on the Trust Indenture Estate, except as
provided in connection with the exercise of remedies under Article IV hereof.

                  (c) At any time after the date of the consummation of the
Refinancing Transaction, the Owner Trustee and the Indenture Trustee may enter
into one or more agreements supplemental hereto without the consent of any Note
Holder for any of the following purposes: (i)(A) to cure any defect or
inconsistency herein or in the Equipment Notes, or to make any change not
inconsistent with

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                                     - 89 -



the provisions hereof (provided that such change does not adversely affect the
interests of any Note Holder in its capacity solely as Note Holder) or (B) to
cure any ambiguity or correct any mistake; (ii) to evidence the succession of
another party as the Owner Trustee in accordance with the terms of the Trust
Agreement or to evidence the succession of a new trustee hereunder pursuant
hereto, the removal of the trustee hereunder or the appointment of any
co-trustee or co-trustees or any separate or additional trustee or trustees;
(iii) to convey, transfer, assign, mortgage or pledge any property to or with
the Indenture Trustee or to make any other provisions with respect to matters or
questions arising hereunder so long as such action shall not adversely affect
the interests of the Note Holders in its capacity solely as Note Holder or
impose upon the Lessee any additional indemnification obligations; (iv) to
correct or amplify the description of any property at any time subject to the
Lien of this Indenture or better to assure, convey and confirm unto the
Indenture Trustee any property subject or required to be subject to the Lien of
this Indenture, the Airframe or Engines or any Replacement Airframe or
Replacement Engine; (v) to add to the covenants of the Owner Trustee for the
benefit of the Note Holders, or to surrender any rights or powers herein
conferred upon the Owner Trustee, the Owner Participant or the Lessee; (vi) to
add to the rights of the Note Holders; and (vii) to include on the Equipment
Notes any legend as may be required by law.

                  (d) Without the consent of the Lessee, no amendment or
supplement to this Indenture or waiver or modification of the terms hereof shall
adversely affect the Lessee in any material respect or impose upon the Lessee
any additional indemnification obligations.

                  SECTION 9.02. Effect of Supplemental Indenture. Upon the
execution of any supplemental indenture pursuant to the provisions hereof, this
Indenture shall be and be deemed to be modified and amended in accordance
therewith and the respective rights, limitations of rights, obligations, duties
and immunities under this Indenture of the Indenture Trustee, the Owner Trustee
and the Note Holders shall thereafter be determined, exercised and enforced
hereunder subject in all respects to such modifications and amendments, and all
the terms and conditions of any such supplemental indenture shall be and be
deemed to be part of the terms and conditions of this Indenture for all and any
purposes.

                  SECTION 9.03. Documents to Be Given to Trustee. The Indenture
Trustee shall be entitled to receive and shall be fully protected in relying
upon an Officers' Certificate and an Opinion of Counsel as conclusive evidence
that any supplemental indenture

                                 Trust Indenture
   95
                                     - 90 -



referred to in Section 9.01 complies with the applicable provisions of this
Indenture.

                  SECTION 9.04. Notation on Notes in Respect of Supplemental
Indentures. Equipment Notes authenticated and delivered after the execution of
any supplemental indenture pursuant to the provisions of this Article IX may
bear a notation in form approved by the Indenture Trustee as to any matter
provided for by such supplemental indenture. If the Owner Trustee or the
Indenture Trustee shall so determine, new Equipment Notes so modified as to
conform, in the opinion of the Owner Trustee and the Indenture Trustee, to any
modification of this Indenture contained in any such supplemental indenture may
be prepared by the Owner Trustee, authenticated by the Indenture Trustee and
delivered in exchange for the Equipment Notes then outstanding.

                  SECTION 9.05. Trustees Protected. If, in the opinion of the
institution acting as Owner Trustee under the Trust Agreement or the institution
acting as Indenture Trustee hereunder, any document required to be executed by
it pursuant to the terms of this Article IX affects adversely any right, duty,
immunity or indemnity with respect to such institution under this Indenture,
such institution may in its discretion decline to execute such document.

                  SECTION 9.06. Documents Mailed to Note Holders. Promptly after
the execution by the Owner Trustee or the Indenture Trustee of any document
entered into pursuant to this Article IX, the Owner Trustee shall mail, by
certified mail, postage prepaid, conformed copies thereof to the Indenture
Trustee (in such quantities as will permit the Indenture Trustee to distribute
one copy to each Note Holder, and the Indenture Trustee shall mail one such copy
to each Note Holder), but the failure of the Owner Trustee or the Indenture
Trustee to mail such conformed copies shall not impair or affect the validity of
such document. The Indenture Trustee will furnish to each Note Holder, promptly
upon receipt thereof, duplicates or copies of all reports, notices, requests,
demands, certificates and other instruments furnished to the Indenture Trustee
under the Lease or hereunder to the extent that the same were not required to
have been furnished to such Note Holder pursuant hereto or to the Lease.

                  SECTION 9.07. No Request Necessary for Lease Supplement or
Indenture Supplement. Notwithstanding anything contained in this Article IX, no
written request or consent of the Indenture Trustee, any Note Holder or the
Owner Participant pursuant to this Article IX shall be required to enable the
Owner Trustee to enter into any Lease Supplement with the Lessee pursuant to the
terms of the Lease to subject the Aircraft, any

                                 Trust Indenture
   96
                                     - 91 -



Engines or other property thereto or to release the Aircraft, any Engine or
other property therefrom or to execute and deliver an Indenture Supplement, in
each case pursuant to the terms hereof or to execute and deliver any supplement
or certificate necessary with respect to the foregoing under the Japanese Lease
Agreement.

                  SECTION 9.08. Notices to Liquidity Provider. Any request made
to any Note Holder for consent to any amendment or supplement pursuant to this
Article IX shall be promptly furnished by the Indenture Trustee to each
Liquidity Provider.


                                    ARTICLE X

                                  MISCELLANEOUS

                  SECTION 10.01. Termination of Indenture. Upon payment in full
of the Principal Amount of, Make-Whole Amount, if any, and all accrued and
unpaid interest on and other amounts then due with respect to the Equipment
Notes and provided that there shall then be no other amounts then due to the
Note Holders and the Indenture Trustee hereunder or under the Lease or the
Refunding Agreement or otherwise secured hereby, the Lien of this Indenture
shall be deemed discharged and the security interests in favor of the Indenture
Trustee and the Note Holders hereunder shall terminate, and the Owner Trustee
shall direct the Indenture Trustee to execute and deliver to or as directed in
writing by the Owner Trustee, an appropriate instrument evidencing the discharge
of such Lien and the termination of such security interest in the Aircraft and
release of the Indenture Documents from the assignment and pledge thereof
hereunder, and the Indenture Trustee shall execute and deliver such instrument
as aforesaid and, at the Owner Trustee's expense, will execute and deliver such
other instruments or documents as may be reasonably requested by the Owner
Trustee to give effect to such discharge, termination and release; provided,
however, that this Indenture and the trusts created hereby shall earlier
terminate and this Indenture shall be of no further force or effect as expressly
provided pursuant to Article X hereof or upon any sale or other final
disposition by the Indenture Trustee of all property part of the Trust Indenture
Estate and the final distribution by the Indenture Trustee of all moneys or
other property or proceeds constituting part of the Trust Indenture Estate in
accordance with the terms hereof. Except as aforesaid otherwise provided, this
Indenture and the trusts created hereby shall continue in full force and effect
in accordance with the terms hereof.

                  SECTION 10.02. No Legal Title to Trust Indenture Estate in
Note Holders. No Note Holder shall have legal title to any part of the Trust
Indenture Estate. No transfer, by operation of law or otherwise, of any
Equipment Note or other

                                 Trust Indenture
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                                     - 92 -



right, title and interest of any Note Holder in and to the Trust Indenture
Estate or hereunder shall operate to terminate this Indenture or entitle such
Note Holder or any successor or transferee of such Holder to an accounting or to
the transfer to it of legal title to any part of the Trust Indenture Estate.

                  SECTION 10.03. Sale of Aircraft by Indenture Trustee is
Binding. Any sale or other conveyance of the Aircraft by the Indenture Trustee
made pursuant to the terms of this Indenture or of the Lease shall bind the Note
Holders and shall be effective to transfer or convey all right, title and
interest of the Indenture Trustee, the Owner Trustee, the Owner Participant and
such Holders in and to the Aircraft. 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 Indenture Trustee.

                  SECTION 10.04. Indenture for Benefit of Owner Trustee,
Indenture Trustee, Owner Participant, Lessee and Note Holders. Nothing in this
Indenture, whether express or implied, shall be construed to give to any Person
other than the Owner Trustee, the Indenture Trustee, the Owner Participant, the
Note Holders, the Lessee and, with respect to any provisions hereof requiring
payment to any Permitted Sublessee, such Permitted Sublessee, any legal or
equitable right, remedy or claim under or in respect of this Indenture.

                  SECTION 10.05. No Action Contrary to Lessee's Rights Under the
Lease. Notwithstanding any of the provisions of this Indenture or the Trust
Agreement to the contrary, each of the Note Holders, the Indenture Trustee and
the Owner Trustee agrees for the benefit of the Lessee that it will not take any
action contrary to the Lessee's rights under the Lease, including the right of
the Lessee to possession and use and quiet enjoyment of the Aircraft, except in
accordance with the provisions of the Lease.

                  SECTION 10.06. Notices. Unless otherwise expressly specified
herein, all notices, requests, demands, authorizations, directions, consents,
waivers or documents required or permitted by the terms of this Indenture shall
be in English and in writing, mailed by first-class registered or certified
mail, postage prepaid, or by confirmed telex or telecopy, and (i) if to the
Owner Trustee, addressed to it at its office at Rodney Square North, Wilmington,
Delaware 19890, Attention: Corporate Trust Administration Department (telex:
835437; answerback: WILMTR; telecopy: (302) 651-8464/8882), with a copy to the
Owner Participant at its address set forth in the Refunding Agreement, (ii) if
to the Indenture Trustee, addressed to it at its office at 450 West 33rd Street,
15th Floor, New York, New York 10001,

                                 Trust Indenture
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                                     - 93 -



Attention: Corporate Trust Department (telecopy: (212) 946-8160) or (iii) if to
the Owner Participant, the Lessee or any Note Holder, addressed to such party at
such address as such party shall have furnished by notice to the Owner Trustee
and the Indenture Trustee, or, until an address is so furnished, addressed to
the address of such party (if any) set forth on the signature pages to the
Refunding Agreement or in the Register. Whenever any notice in writing is
required to be given by the Owner Trustee or the Indenture Trustee or any Note
Holder to any of the other of them, such notice shall be deemed and such
requirement satisfied when such notice is received. Any party hereto may change
the address to which notices to such party will be sent by giving notice of such
change to the other parties to this Indenture.

                  SECTION 10.07. Severability. Any provision of this Indenture
which is prohibited or unenforceable in any jurisdiction shall, as to such
jurisdiction, be ineffective to the extent of such prohibition or
unenforceability without invalidating the remaining provisions hereof, and any
such prohibition or unenforceability in any jurisdiction shall not invalidate or
render unenforceable such provision in any other jurisdiction.

                  SECTION 10.08. No Oral Modifications or Continuing Waivers. No
terms or provisions of this Indenture or the Equipment Notes may be changed,
waived, discharged or terminated orally, but only by an instrument in writing
signed by the party or other Person against whom enforcement of the change,
waiver, discharge or termination is sought; and any waiver of the terms hereof
or of any Equipment Note shall be effective only in the specific instance and
for the specific purpose given.

                  SECTION 10.09. Successors and Assigns. All covenants and
agreements contained herein shall be binding upon, and inure to the benefit of,
each of the parties hereto and the successors and permitted assigns of each, all
as herein provided. Any request, notice, direction, consent, waiver or other
instrument or action by any Note Holder shall bind the successors and assigns of
such Note Holder. This Indenture and the Trust Indenture Estate shall not be
affected by any amendment or supplement to the Trust Agreement or by any other
action taken under or in respect of the Trust Agreement, except that each
reference in this Indenture to the Trust Agreement shall mean the Trust
Agreement as amended and supplemented from time to time to the extent permitted
hereby and thereby. Each Note Holder by its acceptance of an Equipment Note
agrees to be bound by this Indenture and all provisions of the Refunding
Agreement applicable to a Note Holder.


                                 Trust Indenture
   99
                                     - 94 -



                  SECTION 10.10.  Headings.  The headings of the various
Articles and Sections herein and in the table of contents hereto
are for the convenience of reference only and shall not define or
limit any of the terms or provisions hereof.

                  SECTION 10.11. Normal Commercial Relations. Anything contained
in this Indenture to the contrary notwithstanding, the Indenture Trustee, the
Owner Trustee, the Owner Participant, any Note Holder or any bank or other
Affiliate of any of them may conduct any banking or other financial
transactions, and have banking or other commercial relationships, with the
Lessee or any Permitted Sublessee fully to the same extent as if this Indenture
were not in effect, including without limitation the making of loans or other
extensions of credit to the Lessee for any purpose whatsoever, whether related
to any of the transactions contemplated hereby or otherwise.

                  SECTION 10.12. Governing Law; Counterpart Form. THIS INDENTURE
AND THE EQUIPMENT NOTES ISSUED HEREUNDER SHALL IN ALL RESPECTS BE GOVERNED BY,
AND CONSTRUED IN ACCORDANCE WITH, THE LAW OF THE STATE OF NEW YORK, INCLUDING
ALL MATTERS OF CONSTRUCTION, VALIDITY AND PERFORMANCE. This Indenture may be
executed by the parties hereto in separate counterparts, each of which when so
executed and delivered shall be an original, but all such counterparts shall
together constitute but one and the same instrument.

                  SECTION 10.13. Section 1110. It is the intention of the
parties that the Owner Trustee, as lessor under the Lease (and the Indenture
Trustee as assignee of the Owner Trustee's rights hereunder), shall be entitled
to the benefits of Section 1110 of the Bankruptcy Code with respect to the right
to take possession of the Aircraft, Airframe, Engines and Parts as provided in
the Lease in the event of a case under Chapter 11 of the Bankruptcy Code in
which Lessee is a debtor, and in any instance where more than one construction
is possible of the terms and conditions hereof or of any other pertinent
Operative Document, each such party agrees that a construction which would
preserve such benefits shall control over any construction which would not
preserve such benefits.

                  SECTION 10.14. JL Security Agreement. The Owner Trustee hereby
confirms and agrees that its security interest in and to the Aircraft granted
under the JL Security Agreement is and shall be subject and subordinate in all
respects to the Lien of this Indenture, and in the event the Indenture Trustee
shall foreclose the Lien of this Indenture and sell or otherwise transfer the
Aircraft, such sale or other transfer shall be free and clear of such security
interest.


                                 Trust Indenture
   100
                                     - 95 -



                  IN WITNESS WHEREOF, the parties hereto have caused this
Indenture, as amended and restated, to be duly executed by their respective
officers thereunto duly authorized, as of the day and year first above written,
and acknowledge that this Indenture has been made and delivered in The City of
New York.

                                            WILMINGTON TRUST COMPANY, not in its
                                              individual capacity, except as
                                              expressly provided herein, but
                                              solely as Owner Trustee


                                            By:_________________________________
                                               Name:
                                               Title:


                                            THE CHASE MANHATTAN BANK, not in its
                                              individual capacity, except as
                                              expressly provided herein, but
                                              solely as Indenture Trustee


                                            By:_________________________________
                                               Name:
                                               Title:

                                 Trust Indenture
   101
                                    EXHIBIT A
                                       TO
                           SECOND AMENDED AND RESTATED
                     TRUST INDENTURE AND SECURITY AGREEMENT
                                 [GPA 1989 BN-6]


                      TRUST INDENTURE SUPPLEMENT NO. _____
                                 [GPA 1989 BN-6]


                  TRUST INDENTURE SUPPLEMENT NO. _____ dated __________, ___ of
WILMINGTON TRUST COMPANY, not in its individual capacity but solely as owner
trustee (the "Owner Trustee") under the Trust Agreement [GPA 1989 BN-6] dated as
of December 15, 1989 (as amended, the "Trust Agreement") between Wilmington
Trust Company and the Owner Participant named therein.


                              W I T N E S S E T H :


                  WHEREAS, the Trust Indenture and Security Agreement [GPA 1989
BN-6] dated as of December 15, 1989, as amended and restated as of October 1,
1991 and as further amended and restated as of November 26, 1996 (as so amended
and restated, the "Indenture") between the Owner Trustee and The Chase Manhattan
Bank (formerly known as Chemical Bank, successor by merger to Manufacturers
Hanover Trust Company), as Indenture Trustee (the "Indenture Trustee"), provides
for the execution and delivery of a supplement thereto substantially in the form
hereof which shall particularly describe the Aircraft (such term and other
defined terms in the Indenture being herein used with the same meanings) and any
Replacement Airframe or Replacement Engine included in the Trust Indenture
Estate, and shall specifically mortgage such Aircraft, Replacement Airframe or
Replacement Engine, as the case may be, to the Indenture Trustee.

                  WHEREAS, the Original Indenture, as supplemented by Trust
Indenture Supplement No. 1 dated December 22, 1989 subjected to the Lien of such
Indenture the airframe and engines therein described, which Original Indenture
and Trust Indenture Supplement No. 1 have been duly recorded with the Federal
Aviation Administration as one document on April 2, 1990 and assigned Conveyance
No. V79847.

                  WHEREAS, the Amended and Restated Indenture (which amended and
restated the Original Indenture), as supplemented by Trust Indenture Supplement
No. 2 dated October 24, 1991 subjected to the Lien of such Indenture the
airframe and engines therein described, which Amended and Restated Indenture and
Trust Indenture Supplement No. 2 have been duly recorded with the Federal
Aviation Administration as one document on November 12, 1991 and assigned
Conveyance No. Z91423.
   102
                                      - 2 -



                  WHEREAS(1), the Indenture relates to the Airframe and Engines
described below and a counterpart of the Indenture is attached hereto and made a
part hereof and this Indenture Supplement, together with such counterpart of the
Indenture, is being filed for recordation on the date hereof with the Federal
Aviation Administration as one document.

                 WHEREAS(2), the Owner Trustee has, as provided in the
Indenture, heretofore executed and delivered to the Indenture Trustee [3]
Indenture Supplement(s) for the purpose of specifically subjecting to the Lien
of the Indenture certain airframes and/or engines therein described, which
Indenture Supplement(s) is (are) dated and has (have) been duly recorded with
the Federal Aviation Administration as set forth below, to wit:

         Date          Recordation Date         FAA Document No.
         ----          ----------------         ----------------




                  NOW, THEREFORE, This Supplement Witnesseth, that, to secure
the prompt payment of the Principal Amount of, interest on, Make-Whole Amount,
if any, and all other amounts due with respect to, all Equipment Notes from time
to time outstanding under the Indenture and the performance and observance by
the Owner Trustee of all the agreements, covenants and provisions contained in
the Indenture and the Refunding Agreement and the Equipment Notes, for the
benefit of the Note Holders, and the prompt payment of any and all amounts from
time to time owing under the Refunding Agreement by the Owner Trustee, the Owner
Participant and the Lessee in each case to the Note Holders and for the uses and
purposes and subject to the terms and provisions of the Indenture, and in
consideration of the premises and of the covenants contained in the Indenture,
and of the acceptance of the Equipment Notes by the Holders thereof, and of the
sum of $1 paid to the Owner Trustee by the Indenture Trustee at or before the
delivery of the Indenture, the receipt whereof is hereby acknowledged, the Owner
Trustee has granted, bargained, sold,
- --------
(1)      This recital is to be included only in the first Indenture Supplement
         (including the first Indenture Supplement filed with respect to the
         Indenture).

(2)      This recital not to be included in the first Indenture
         Supplement.

(3)      Insert appropriate number.


                       Form of Trust Indenture Supplement
   103
                                      - 3 -



assigned, transferred, conveyed, mortgaged, pledged and confirmed, and does
hereby grant, bargain, sell, assign, transfer, convey, mortgage, pledge and
confirm, unto the Indenture Trustee, its successors and assigns, for the
security and benefit of the Note Holders from time to time, in the trust created
by the Indenture, a first priority security interest in and mortgage Lien on all
estate, right, title and interest of the Owner Trustee in, to and under the
following described property:

                                   AIRFRAME(S)
                  (    ) airframe(s) identified as follows:

                                       FAA Registration        Manufacturer's
Manufacturer             Model              Number              Serial Number
- ------------             -----         ----------------        --------------




together with all appliances, equipment, instruments and accessories (including,
without limitation, radio and radar) from time to time thereto belonging, owned
by the Owner Trustee and installed in or appurtenant to said aircraft.


                                AIRCRAFT ENGINES

                  (    ) aircraft engines, each such engine
                  having 750 or more rated takeoff horsepower
                  or the equivalent thereof, identified as
                  follows:

                                                         Manufacturer's
           Manufacturer          Model                   Serial Number
           ------------          -----                   --------------




together with all equipment and accessories thereto belonging, by whomsoever
manufactured, owned by the Owner Trustee and installed in or appurtenant to said
aircraft engines.

                  Together with all substitutions, replacements and renewals of
the property above described, and all property which shall hereafter become
physically attached to or incorporated in the property above described, whether
the same are now owned by the Owner Trustee or shall hereafter be acquired by
it.



                       Form of Trust Indenture Supplement
   104
                                      - 4 -



                  As further security for the obligations referred to above and
secured by the Indenture and hereby, the Owner Trustee 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 Indenture Trustee, its successors and assigns, for the
security and benefit of the Note Holders from time to time, in the trust created
by the Indenture, all of the estate, right, title and interest of the Owner
Trustee in, to and under the Lease and Lease Supplement [GPA 1989 BN-6] No. 3 of
even date herewith (other than Excepted Payments) covering the property
described above.

                  TO HAVE AND TO HOLD all and singular the aforesaid property
unto the Indenture Trustee, its successors and assigns, for the benefit and
security of the Note Holders from time to time for the uses and purposes and
subject to the terms and provisions set forth in the Indenture.

                  This Supplement shall be construed as supplemental to the
Indenture and shall form a part of it, and the Indenture is hereby incorporated
by reference herein and is hereby ratified, approved and confirmed.

                  This Supplement is being delivered in the State of New York.

                  AND, FURTHER, the Owner Trustee hereby acknowledges that the
Aircraft and/or Engines referred to in this Supplement and the aforesaid Lease
Supplement has been delivered to the Owner Trustee and is included in the
property of the Owner Trustee covered by all the terms and conditions of the
Trust Agreement, subject to the pledge and mortgage thereof under the Indenture.




                       Form of Trust Indenture Supplement
   105
                                      - 5 -



                  IN WITNESS WHEREOF, the Owner Trustee has caused this
Supplement to be duly executed by one of its officers thereunto duly authorized
on the day and year first above written.

                                          WILMINGTON TRUST COMPANY, not in
                                          its individual capacity, except
                                          as otherwise expressly provided
                                          herein, but solely as Owner Trustee



                                          By_________________________________
                                            Title:



                       Form of Trust Indenture Supplement
   106
                                   SCHEDULE I
                                       TO
                           SECOND AMENDED AND RESTATED
                     TRUST INDENTURE AND SECURITY AGREEMENT
                                 [GPA 1989 BN-6]




                                                MATURITY
                       PRINCIPAL AMOUNT           DATE           DEBT RATE
                       ----------------         --------         ---------
                                                        
Series A                 $11,936,662            02-Jan-2006          6.85%
Series B                 $ 4,476,246            02-Jul 2002          6.93%
Series C                 $ 4,476,247            02-Jan-2002          6.86%
Series D                 $ 3,575,831              02-Jul-98          8.16%

   107
                          EQUIPMENT NOTES AMORTIZATION

                                    SERIES A

                                Aircraft: N626AW


                   Principal Amount                       Percentage of Original
                    Repayment Date                          Amount to be Paid
                   ----------------                       ----------------------

   108
                                    SERIES B

                                Aircraft: N626AW


                   Principal Amount                       Percentage of Original
                    Repayment Date                          Amount to be Paid
                   ----------------                       ----------------------

   109
                                    SERIES C

                                Aircraft: N626AW


                   Principal Amount                       Percentage of Original
                    Repayment Date                          Amount to be Paid
                   ----------------                       ----------------------


   110
                                    SERIES D

                                Aircraft: N626AW


                   Principal Amount                      Percentage of Original
                    Repayment Date                         Amount to be Paid
                   ----------------                      ----------------------

   111
                                   SCHEDULE II
                                       TO
                   SECOND AMENDED AND RESTATED TRUST INDENTURE
                             AND SECURITY AGREEMENT
                                 [GPA 1989 BN-6]


                          PASS THROUGH TRUST AGREEMENTS


1.       Pass Through Trust Agreement, dated as of November 26, 1996, between
         America West Airlines, Inc., and Fleet National Bank, as supplemented
         by Trust Supplement No. 1996-1A, dated November 26, 1996.

2.       Pass Through Trust Agreement, dated as of November 26, 1996, between
         America West Airlines, Inc., and Fleet National Bank, as supplemented
         by Trust Supplement No. 1996-1B, dated November 26, 1996.

3.       Pass Through Trust Agreement, dated as of November 26, 1996, between
         America West Airlines, Inc., and Fleet National Bank, as supplemented
         by Trust Supplement No. 1996-1C, dated November 26, 1996.

4.       Pass Through Trust Agreement, dated as of November 26, 1996, between
         America West Airlines, Inc., and Fleet National Bank, as supplemented
         by Trust Supplement No. 1996-1D, dated November 26, 1996.


                                  Schedule II-1