Document:

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                            TRUST AGREEMENT [____]

                         Dated as of [______________]

                                   Between

                         [_________________________]

                                     and

                        FIRST SECURITY BANK, NATIONAL
                                 ASSOCIATION

                    _____________________________________

                   One Boeing Model [_____________]Aircraft
               Bearing Manufacturer's Serial No. [___________]

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                                TABLE OF CONTENTS

                                                                          PAGE

SECTION 1.    DEFINITIONS..................................................1

SECTION 2.    DECLARATION OF TRUST.........................................1

SECTION 3.    AUTHORIZATION; CONDITIONS PRECEDENT..........................1

        3.1   Authorization................................................1
        3.2   Conditions Precedent.........................................2

SECTION 4.    RECEIPT, DISTRIBUTION AND APPLICATION OF INCOME
              FROM THE TRUST ESTATE........................................3

        4.1   Payments from Trust Estate Only..............................3
        4.2   Distribution of Payments.....................................3
        4.3   Method of Payments...........................................4

SECTION 5.    DUTIES OF OWNER TRUSTEE......................................5

        5.1   Notice of Event of Default...................................5
        5.2   Action upon Instructions.....................................5
        5.3   Limitations on Duties........................................6
        5.4   No Duties except as Specified; No Action except as
              Specified....................................................6
        5.5   Satisfaction of Conditions Precedent.........................6
        5.6   Fixed Investment Trust.......................................7

SECTION 6.    OWNER TRUSTEE................................................7

        6.1   Acceptance of Trusts and Duties..............................7
        6.2   Absence of Certain Duties....................................7
        6.3   No Representations or Warranties as to Certain
              Matters......................................................8
        6.4   No Segregation of Monies; Interest...........................9
        6.5   Reliance upon Certificates, Counsel and Agents...............9
        6.6   Not Acting in Individual Capacity............................10
        6.7   Fees; Compensation...........................................10
        6.8   Tax Returns..................................................10

SECTION 7.    INDEMNIFICATION OF FIRST SECURITY BY OWNER
              PARTICIPANT..................................................10

SECTION 8.    TRANSFER OF OWNER PARTICIPANT'S INTEREST.....................12

        8.1   Transfer of Interest.........................................12

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                                TABLE OF CONTENTS
                                     CONT'D
                                                                          PAGE

SECTION 9.    SUCCESSOR OWNER TRUSTEES; CO-TRUSTEES........................12

        9.1   Resignation of Owner Trustee; Appointment of
              Successor....................................................12
        9.2   Co-Trustees and Separate Trustees............................13

SECTION 10.   SUPPLEMENTS AND AMENDMENTS TO TRUST AGREEMENT AND
              OTHER DOCUMENTS..............................................15

        10.1  Supplements and Amendments and Delivery Thereof..............15
        10.2  Discretion as to Execution of Documents......................16
        10.3  Absence of Requirements as to Form...........................16
        10.4  Distribution of Documents....................................16
        10.5  No Request Needed as to Lease Supplement and Trust
              Indenture Supplement.........................................16

SECTION 11.   MISCELLANEOUS................................................16

        11.1  Termination of Trust Agreement...............................16
        11.2  Termination at Option of the Owner Participant...............17
        11.3  Owner Participant Has No Legal Title in Trust Estate.........17
        11.4  Assignment, Sale, etc. of Aircraft...........................17
        11.5  Trust Agreement for Benefit of Certain Parties Only..........17
        11.6  [Reserved]...................................................18
        11.7  Notices......................................................18
        11.8  Severability.................................................18
        11.9  Waivers, Etc.................................................18
        11.10 Counterparts.................................................18
        11.11 Binding Effect, Etc..........................................19
        11.12 Headings; References.........................................19
        11.13 Governing Law................................................19

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                            TRUST AGREEMENT [_______]

      This TRUST AGREEMENT [______], dated as of [________________], between
[_________], a corporation organized under the laws of the OP Jurisdiction
("Owner Participant"), and First Security Bank, National Association, a national
banking association (in its individual capacity, "First Security" and otherwise
not in its individual capacity but solely as trustee hereunder, "Owner
Trustee").

                                 WITNESSETH:

SECTION 1. DEFINITIONS

      Capitalized terms used but not defined herein shall have the respective
meanings set forth or incorporated by reference, and shall be construed and
interpreted in the manner described, in Annex A to the Lease.

SECTION 2. DECLARATION OF TRUST

      First Security hereby declares that it will hold the Trust Estate as Owner
Trustee upon the trusts hereinafter set forth for the use and benefit of Owner
Participant, subject, however, to the provisions of and the Lien created by the
Trust Indenture and to the provisions of the Lease and the Participation
Agreement.

SECTION 3. AUTHORIZATION; CONDITIONS PRECEDENT

      3.1 AUTHORIZATION

      In respect of the Aircraft, Owner Participant hereby authorizes and
directs Owner Trustee to, and Owner Trustee agrees for the benefit of Owner
Participant that it will, on and after the Delivery Date, subject (except with
respect to Section 3.1(a)) to due compliance with the terms of Section 3.2:

      (a) execute and deliver the Participation Agreement, the Trust Indenture,
the Lease and the other Owner Trustee Agreements (in the respective forms in
which they are delivered from time to time by Owner Participant to Owner
Trustee);

      (b) subject to the terms of this Trust Agreement, exercise (i) its rights
and perform its duties under the Participation Agreement, (ii) the rights and
perform the duties of Lessor under the Lease and (iii) its rights and perform
its duties under the Trust Indenture and the other Owner Trustee Agreements;

      (c) execute, issue and deliver to Mortgagee for authentication and further
delivery to the Subordination Agent the Equipment Notes in the amount and as
provided in Section 2 of the Participation Agreement;

      (d) purchase the Aircraft pursuant to the Purchase Agreement as assigned
to Owner Trustee pursuant to the Purchase Agreement Assignment;

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      (e) accept from Airframe Manufacturer the delivery of the Aircraft Bill of
Sale, the FAA Bill of Sale and the invoice with respect to such Aircraft and
from Lessee the delivery of the BFE Bill of Sale and the invoice with respect to
such BFE;

      (f) effect the registration of the Aircraft with the FAA in the name of
Owner Trustee by filing or causing to be filed with the FAA: (i) the FAA Bill of
Sale; (ii) an Aircraft Registration Application in the name of Owner Trustee
(including, without limitation, an affidavit from Owner Trustee in compliance
with the provisions of Section 47.7(c)(2) of the FAA Regulations); and (iii)
this Trust Agreement;

      (g) execute and deliver the Financing Statements referred to in Section
5.1.2 (xxii) of the Participation Agreement, together with all other agreements,
documents and instruments referred to in Section 5 of the Participation
Agreement to which Owner Trustee is to be a party;

      (h) make payment of Lessor's Cost for the Aircraft from the aggregate
amount of the Commitments for the Aircraft of Owner Participant and Loan
Participants, to the extent received by Owner Trustee, in the manner provided in
the Participation Agreement;

      (i) execute and deliver Lease Supplement No. 1 covering the Aircraft;

      (j) execute and deliver a Trust Indenture Supplement covering the
Aircraft; and

      (k) execute and deliver all such other instruments, documents or
certificates and take all such other actions in accordance with the direction of
Owner Participant, as Owner Participant may deem necessary or advisable in
connection with the transactions contemplated by this Trust Agreement and the
other Operative Agreements.

      3.2 CONDITIONS PRECEDENT

      The rights and obligations of Owner Trustee to take the actions required
by Section 3.1 shall be subject to the following conditions precedent:

      (a) Owner Trustee shall have received the notice described in Section
5.1.1 of the Participation Agreement, when and as required thereby, or shall
have been deemed to have waived such notice in accordance with Section 5.1.1 of
the Participation Agreement;

      (b) Each Participant shall have made the full amount of its Commitment
specified in Section 2.1 of the Participation Agreement available to Owner
Trustee, in immediately available funds, in accordance with Sections 2 and 4 of
the Participation Agreement; and

      (c) Owner Participant shall have notified Owner Trustee that the terms and
conditions of Section 5 of the Participation Agreement, insofar as they relate
to conditions precedent to performance by Owner Participant of its obligations
thereunder, have been either fulfilled to the satisfaction of, or waived by,
Owner Participant. Owner Participant shall, by instructing Owner Trustee to
release the full amount of its Commitment then held by Owner Trustee as provided
in Section 2 of the Participation Agreement, be deemed to have found
satisfactory to it, or waived, all such conditions precedent.

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SECTION 4. RECEIPT, DISTRIBUTION AND APPLICATION OF INCOME FROM THE TRUST ESTATE

      4.1 PAYMENTS FROM TRUST ESTATE ONLY

      Except as provided in Section 6.1, all payments to be made by Owner
Trustee under this Trust Agreement shall be made only from (a) in the case of
funds made available in accordance with Section 4 of the Participation
Agreement, the Commitments (except as otherwise provided in Section 14 of the
Participation Agreement) and (b) in the case of all other payments, the income
from and proceeds of the Trust Estate to the extent that Owner Trustee shall
have received sufficient income or proceeds from the Trust Estate to make such
payments. Owner Participant agrees that it will look solely (y) in the case of
funds made available in accordance with Section 4 of the Participation
Agreement, to the Commitments and any income therefrom (except as otherwise
provided in Section 14 of the Participation Agreement) and (z) in the case of
all other payments, to the income from and proceeds of the Trust Estate to the
extent available for distribution to Owner Participant as provided in this Trust
Agreement. Except as provided in Section 6.1, Owner Participant agrees that
First Security is neither personally liable to Owner Participant for any amounts
payable nor subject to any other liability under this Trust Agreement.

      4.2 DISTRIBUTION OF PAYMENTS

            4.2.1 PAYMENTS TO MORTGAGEE

      Until the Trust Indenture shall have been discharged pursuant to Section
10.01 thereof, all Rent, insurance proceeds and requisition or other payments of
any kind included in the Trust Estate (other than Excluded Payments) payable to
Owner Trustee shall be payable directly to Mortgagee (and, if any of the same
are received by Owner Trustee, shall upon receipt be paid over to Mortgagee
without deduction, set-off or adjustment of any kind) for distribution in
accordance with the provisions of Article III of the Trust Indenture; PROVIDED,
that any payments received by Owner Trustee from (a) Lessee with respect to
Owner Trustee's fees and disbursements or (b) Owner Participant pursuant to
Section 7 shall not be paid over to Mortgagee but shall be retained by Owner
Trustee and applied toward the purpose for which such payments were made.

            4.2.2 PAYMENTS TO OWNER TRUSTEE, OTHER PARTIES

      After the Trust Indenture shall have been discharged pursuant to
Section 10.01 thereof, any payment of the type referred to in Section 4.2.1
(other than Excluded Payments) received by Owner Trustee, any payment
received from Mortgagee (other than Excluded Payments) and any other amount
received as part of the Trust Estate and for the application or distribution
of which no provision is made in this Trust Agreement shall be distributed
forthwith upon receipt by Owner Trustee in the following order of priority:
FIRST, so much of such payment as shall be required to reimburse Owner
Trustee for any expenses not otherwise reimbursed as to which Owner Trustee
is entitled to be so reimbursed pursuant to the provisions hereof shall be
retained by Owner Trustee; SECOND, so much of the remainder for which
provision as to the application thereof is contained in the Lease or any of

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the other Operative Agreements shall be applied and distributed in accordance
with the terms of the Lease or such other Operative Agreement; and THIRD, the
balance, if any, shall be paid to Owner Participant.

            4.2.3 CERTAIN DISTRIBUTIONS TO OWNER PARTICIPANT

      All amounts from time to time distributable by Mortgagee to Owner
Participant pursuant to the Trust Indenture shall, if paid to Owner Trustee,
be distributed by Owner Trustee to Owner Participant in accordance with the
provisions of Article III of the Trust Indenture; PROVIDED, that any payments
received by Owner Trustee from (a) Lessee with respect to Owner Trustee's
fees and disbursements or (b) Owner Participant pursuant to Section 7 shall
not be paid over to Owner Participant but shall be retained by Owner Trustee
and applied toward the purpose for which such payments were made.

            4.2.4 EXCLUDED PAYMENTS

      Any Excluded Payments received by Owner Trustee shall be paid by Owner
Trustee to the Person to whom such Excluded Payments are payable under the
provisions of the Participation Agreement, the Tax Indemnity Agreement or the
Lease.

            4.2.5 MULTIPLE OWNER PARTICIPANTS

      If, as a result of a transfer by Owner Participant under Section 8.1,
there is more than one Owner Participant under this Trust Agreement, each
such Owner Participant shall hold in proportion to its respective beneficial
interest in the Trust Estate an undivided beneficial interest in the entire
Trust Estate and is entitled to receive ratably with any other Owner
Participant payments distributable by Owner Trustee under this Trust
Agreement.  No Owner Participant shall have legal title to the Aircraft or
any other portion of the Trust Estate.

      4.3 METHOD OF PAYMENTS

      Owner Trustee shall make distributions or cause distributions to be
made to Owner Participant pursuant to this Section 4 by transferring the
amount to be distributed by wire transfer in immediately available funds on
the day received (or on the next succeeding Business Day if the funds to be
so distributed shall not have been received by Owner Trustee by 12:00 noon,
New York City time, and which funds Owner Trustee shall not have been
reasonably able to distribute to Owner Participant on the day received) to
Owner Participant's account set forth in Schedule 1 to the Participation
Agreement or to such other account or accounts of Owner Participant as Owner
Participant may designate from time to time in writing to Owner Trustee;
PROVIDED, that Owner Trustee shall use reasonable efforts to invest
overnight, in investments that would be permitted under Section 4.4 of the
Lease, all funds received by it at or later than 12:00 noon, New York City
time, and which funds Owner Trustee shall not have been reasonably able to
distribute to Owner Participant on the day received).

<PAGE>

SECTION 5. DUTIES OF OWNER TRUSTEE

      5.1 NOTICE OF EVENT OF DEFAULT

      (a) If Owner Trustee shall have knowledge of a Lease Default or a Lease
Event of Default or an Indenture Default or an Indenture Event of Default, Owner
Trustee shall give to Owner Participant, Mortgagee and Lessee prompt telephonic
or telex notice thereof followed by prompt confirmation thereof by certified
mail, postage prepaid, PROVIDED, that (i) in the case of an event which with the
passage of time would constitute an Indenture Event of Default of the type
referred to in paragraph (c) or (e) of Section 4.02 of the Trust Indenture, such
notice shall in no event be furnished later than ten days after Owner Trustee
shall first have knowledge of such event and (ii) in the case of a
misrepresentation by Owner Trustee which with the passage of time would
constitute an Indenture Event of Default of the type referred to in paragraph
(d) of Section 4.02 of the Trust Indenture, such notice shall in no event be
furnished later than ten days after Owner Trustee shall first have knowledge of
such event.

      (b) Subject to the terms of Section 5.3, Owner Trustee shall take such
action or shall refrain from taking such action, not inconsistent with the
provisions of the Trust Indenture, with respect to such Lease Default, Lease
Event of Default, Indenture Default or Indenture Event of Default or other event
as Owner Trustee shall be directed in writing by Owner Participant. For all
purposes of this Trust Agreement, the Lease and the other Operative Agreements,
in the absence of Actual Knowledge of Owner Trustee, Owner Trustee shall not be
deemed to have knowledge of a Lease Default, Lease Event of Default, Indenture
Default or Indenture Event of Default unless notified in writing by Mortgagee,
Owner Participant or Lessee.

      5.2 ACTION UPON INSTRUCTIONS

      Subject to the terms of Sections 5.1 and 5.3, upon the written
instructions at any time and from time to time of Owner Participant, Owner
Trustee will take such of the following actions, not inconsistent with the
provisions of the Lease and the Trust Indenture, as may be specified in such
instructions: (a) give such notice or direction or exercise such right, remedy
or power under this Trust Agreement or any of the other Owner Trustee Agreements
or in respect of all or any part of the Trust Estate, or take such other action,
as shall be specified in such instructions (including entering into such
agreements and instruments as shall be necessary under Section 10); (b) take
such action to preserve or protect the Trust Estate (including the discharge of
Liens) as may be specified in such instructions; (c) approve as satisfactory to
it all matters required by the terms of the Lease or the other Operative
Agreements to be satisfactory to Owner Trustee, it being understood that without
written instructions of Owner Participant, Owner Trustee shall not approve any
such matter as satisfactory to it; (d) subject to the rights of Lessee under the
Operative Agreements, after the expiration or earlier termination of the Lease,
convey all of Owner Trustee's right, title and interest in and to the Aircraft
for such amount, on such terms and to such purchaser or purchasers as shall be
designated in such instructions, or retain, lease or otherwise dispose of, or
from time to time take such other action with respect to, the Aircraft on such
terms as shall be designated in such instructions; and (e) take or refrain from
taking such other action or actions as may be specified in such instructions.

<PAGE>

      5.3 LIMITATIONS ON DUTIES

      Owner Trustee shall not be required to take any action under
Section 5.1 (other than the giving of the notices referred to therein) or 5.2
if Owner Trustee shall reasonably believe such action is not adequately
indemnified by Owner Participant under Section 7, unless Lessee or Owner
Participant agrees to furnish such additional indemnity as shall reasonably
be required, in manner and form satisfactory to Owner Trustee, and, in
addition to the extent not otherwise paid pursuant to the provisions of the
Lease or of the Participation Agreement, to pay the reasonable compensation
of Owner Trustee for the services performed or to be performed by it pursuant
to such direction and any reasonable fees and disbursements of counsel or
agents employed by Owner Trustee in connection therewith.  Owner Trustee
shall not be required to take any action under Section 5.1 or 5.2 (other than
the giving of the notices referred to therein) if Owner Trustee shall have
been advised by counsel that such action is contrary to the terms of any of
the Owner Trustee Agreements or is otherwise contrary to Law and Owner
Trustee has delivered to Owner Participant written notice of the basis for
its refusal to act.

      5.4 NO DUTIES EXCEPT AS SPECIFIED; NO ACTION EXCEPT AS SPECIFIED

            5.4.1 NO DUTIES EXCEPT AS SPECIFIED

      Owner Trustee shall not have any duty or obligation to manage, control,
use, sell, dispose of or otherwise deal with the Aircraft or any other part
of the Trust Estate or to otherwise take or refrain from taking any action
under, or in connection with, any of the Owner Trustee Agreements, except as
expressly required by the terms of any of the Owner Trustee Agreements, or
(to the extent not inconsistent with the provisions of the Trust Indenture)
as expressly provided by the terms hereof or in a written instruction from
Owner Participant received pursuant to the terms of Section 5.1 or 5.2, and
no implied duties or obligations shall be read into this Trust Agreement
against Owner Trustee.  First Security agrees that it will, in its individual
capacity and at its own cost or expense (but without any right of indemnity
in respect of any such cost or expense hereunder or under the Participation
Agreement), promptly take such action as may be necessary to duly discharge
and satisfy in full all Lessor Liens attributable to it in its individual
capacity which it is required to discharge pursuant to Section 7.3.1 of the
Participation Agreement and otherwise comply with the terms of said Section
binding upon it.

            5.4.2 NO ACTION EXCEPT AS SPECIFIED

      Owner Trustee shall have no power, right or authority to, and agrees
that it will not, manage, control, use, sell, dispose of or otherwise deal
with the Aircraft or any other part of the Trust Estate except (a) as
expressly required by the terms of any of the Owner Trustee Agreements,
(b) as expressly provided by the terms hereof or (c) as expressly provided in
written instructions from Owner Participant pursuant to Section 5.1 or 5.2.

      5.5 SATISFACTION OF CONDITIONS PRECEDENT

      Anything in this Trust Agreement to the contrary notwithstanding, Owner
Trustee shall, subject to the satisfaction of special counsel for Owner

<PAGE>

Trustee of the occurrence of all the applicable conditions precedent
specified in Section 3.2, comply with the provisions of Section 3.1.

      5.6 FIXED INVESTMENT TRUST

      Notwithstanding anything in this Trust Agreement to the contrary, Owner
Trustee shall not be authorized and shall have no power to "vary the
investment" of Owner Participant within the meaning of Treasury Regulations
Section 301.7701-4(c)(1), it being understood that Owner Trustee shall have
the power and authority to fulfill its obligations under Section 4.3 hereof
and Section 4.4 of the Lease.

SECTION 6. OWNER TRUSTEE

      6.1 ACCEPTANCE OF TRUSTS AND DUTIES

      First Security accepts the trusts hereby created and agrees to perform
the same as Owner Trustee but only upon the terms hereof and the Trust
Indenture applicable to it.  Owner Trustee also agrees to receive and
disburse all monies received by it constituting part of the Trust Estate
pursuant to the terms hereof.  First Security shall not be answerable or
accountable under any circumstances, except for (a) its own willful
misconduct or gross negligence (including, without limitation, in connection
with any activities of Owner Trustee in violation of Section 5.4.2), (b) its
failure (in its individual capacity) to perform its obligations under
Section 5.4.1, (c) its or Owner Trustee's failure to use ordinary care to
receive or disburse funds or to comply with the first sentence of
Section 6.8, (d) liabilities that may result from the inaccuracy of any
representation or breach of warranty of it in its individual capacity (or
from the failure by it in its individual capacity to perform any covenant) in
this Trust Agreement, the Trust Indenture, the Lease or the Participation
Agreement or elsewhere in any of the other Operative Agreements, (e) taxes,
fees or other charges on, based on or measured by any fees, commissions or
compensation received by First Security in connection with the transactions
contemplated by this Trust Agreement and the other Operative Agreements to
which it (in its individual capacity or as Owner Trustee) is a party, (f) its
or Owner Trustee's failure to use ordinary care in receiving or disbursing
funds or in connection with its obligation to invest funds pursuant to
Section 4.4 of the Lease or Section 4.3 hereof, (g) for any liability on the
part of Owner Trustee arising out of its negligence or willful or negligent
misconduct in connection with its obligations under Section 5.1 (other than
the first sentence thereof), 6.8 or 9.2 hereof or Section 4.01 of the Trust
Indenture.  First Security shall have no obligation to advance its individual
funds for any purpose, and Owner Trustee shall have no obligation to
distribute to Owner Participant, Lessee or any third party any amounts to be
paid to Owner Trustee until such amounts are collected by Owner Trustee.

      6.2 ABSENCE OF CERTAIN DUTIES

      (a) Except in accordance with written instructions furnished pursuant to
Section 5.1 or 5.2 and except as provided in, and without limiting the
generality of, Sections 3.1 and 5.4.1 and the last sentence of Section 9.1.2,
and subject to Section 4.01 of the Trust Indenture, neither Owner Trustee nor
First Security shall have any duty (i) to see to any recording or filing of any
Operative Agreement or of any supplement to any thereof or to see to the

<PAGE>

maintenance of any such recording or filing or any other filing of reports with
the FAA or other governmental agencies, except that of First Security to comply
with the FAA reporting requirements set forth in 14 C.F.R. ss. 47.45 and 14
C.F.R. ss. 47.51, and Owner Trustee shall, to the extent that information for
that purpose is timely supplied by Lessee pursuant to any of the Operative
Agreements, complete and timely submit (and furnish Owner Participant with a
copy of) any and all reports relating to the Aircraft that may from time to time
be required by the FAA or any government or governmental authority having
jurisdiction, (ii) to see to any insurance on the Aircraft or to effect or
maintain any such insurance, whether or not Lessee shall be in default with
respect thereto, other than to forward to Owner Participant copies of all
reports and other written information which Owner Trustee receives from Lessee
pursuant to Section 11 of the Lease, (iii) except as provided in Section 7.3.1
or 7.3.2 of the Participation Agreement, Section 4.01 of the Trust Indenture or
Section 5.4 or 6.1 hereof, to see to the payment or discharge of any tax,
assessment or other governmental charge or any lien or encumbrance of any kind
owing with respect to or assessed or levied against any part of the Trust
Indenture Estate or the Trust Estate, except as provided in Section 6.3.9 of the
Participation Agreement or (iv) to inspect Lessee's books and records with
respect to the Aircraft at any time permitted pursuant to the Lease.

      (b) Notwithstanding clause (a), Owner Trustee will furnish to Mortgagee
and Owner Participant, promptly upon receipt thereof, duplicates or copies of
all reports, notices, requests, demands, certificates, financial statements and
other instruments furnished to Owner Trustee under the Lease or any other
Operative Agreement except to the extent to which a responsible officer of Owner
Trustee reasonably believes (and confirms by telephone call with Owner
Participant) that duplicates or copies thereof have already been furnished to
Owner Participant by some other person.

      6.3 NO REPRESENTATIONS OR WARRANTIES AS TO CERTAIN MATTERS

      NEITHER FIRST SECURITY NOR OWNER TRUSTEE MAKES OR SHALL BE DEEMED TO
HAVE MADE (a) ANY REPRESENTATION OR WARRANTY, EXPRESS OR IMPLIED, AS TO THE
TITLE, AIRWORTHINESS, VALUE, CONDITION, DESIGN, OPERATION, MERCHANTABILITY OR
FITNESS FOR USE FOR A PARTICULAR PURPOSE OF THE AIRCRAFT 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, THE
ABSENCE OF ANY STRICT LIABILITY OBLIGATION OR ANY OTHER REPRESENTATION OR
WARRANTY, EXPRESS OR IMPLIED, WITH RESPECT TO THE AIRCRAFT OR ANY PART
THEREOF WHATSOEVER, except that First Security warrants to Owner Participant
that on the Delivery Date Owner Trustee shall have received whatever title to
the Aircraft that was conveyed to it and that the Aircraft shall, on the
Delivery Date and during the Term, be free of Lessor Liens attributable to
First Security or (b) any representation or warranty as to the validity,
legality or enforceability of this Trust Agreement or any other Operative
Agreement to which First Security, in its individual capacity or as Owner
Trustee, is a party, or any other document or instrument, or as to the
correctness of any statement contained in any thereof except to the extent
that any such statement is expressly made herein or therein by such party as
a representation by First Security, in its individual capacity or as Owner
Trustee, as the case may be, and except that First Security hereby represents

<PAGE>

and warrants that it has all corporate power and authority to execute,
deliver and perform this Trust Agreement and that this Trust Agreement has
been, and (assuming due authorization, execution and delivery by Owner
Participant of this Trust Agreement) the other Operative Agreements to which
it or Owner Trustee is a party have been (or at the time of execution and
delivery of any such instrument by it or Owner Trustee under this Trust
Agreement or pursuant to the terms of the Participation Agreement that such
an instrument will be) duly executed and delivered by one of its officers who
is or will be, as the case may be, duly authorized to execute and deliver
such instruments on behalf of itself or Owner Trustee, as the case may be,
and that this Trust Agreement constitutes the legal, valid and binding
obligation of First Security or Owner Trustee, as the case may be,
enforceable against First Security or Owner Trustee, as the case may be, in
accordance with its terms.

      6.4 NO SEGREGATION OF MONIES; INTEREST

      Monies received by Owner Trustee under this Trust Agreement need not be
segregated in any manner except to the extent required by Law, or except as
provided in written instructions from Owner Participant, and shall be
invested as provided in Section 4.3 hereof or Section 4.4 of the Lease.

      6.5 RELIANCE UPON CERTIFICATES, COUNSEL AND AGENTS

      Owner Trustee shall incur no liability to anyone in acting in good
faith in reliance upon and in accordance with any signature, instrument,
notice, resolution, request, consent, order, certificate, report, opinion,
bond or other document or paper reasonably believed by it to be genuine and
reasonably believed by it to be signed by the proper party or parties.
Unless other evidence in respect thereof is specifically prescribed in this
Trust Agreement, any request, direction, order or demand of Owner Participant
or Lessee mentioned in this Trust Agreement or in any of the other Owner
Trustee Agreements shall be sufficiently evidenced by written instruments
signed by the Chairman of the Board, the President, any Vice President or any
other officer and in the name of Owner Participant or Lessee, as the case may
be.  Owner Trustee may accept a copy of a resolution of the Board of
Directors or Executive Committee of Lessee, certified by the Secretary or an
Assistant Secretary of Lessee as duly adopted and in full force and effect,
as conclusive evidence that such resolution has been duly adopted by said
Board of Directors or Executive Committee and that the same is in full force
and effect.  As to any fact or matter the manner of ascertainment of which is
not specifically described in this Trust Agreement, Owner Trustee may, absent
Actual Knowledge to the contrary, for all purposes rely on a certificate
signed by the Chairman of the Board, the President, any Vice President or any
other officer of Lessee, and the Treasurer or an Assistant Treasurer or the
Secretary or an Assistant Secretary of Lessee, as to such fact or matter, and
such certificate shall constitute full protection to Owner Trustee for any
action taken or omitted to be taken by it in good faith in reliance thereon
and in accordance therewith.  In the administration of trusts under this
Trust Agreement, Owner Trustee may execute any of the trusts or powers and
perform its powers and duties under this Trust Agreement directly or through
agents or attorneys and may, at the expense of the Trust Estate, consult with
counsel, accountants and other skilled persons to be selected and employed by
it.  Owner Trustee shall not be liable for anything done, suffered or omitted
in good faith by it in accordance with the advice or opinion of any such
counsel, accountants or other skilled persons.

<PAGE>

      6.6 NOT ACTING IN INDIVIDUAL CAPACITY

      In acting under this Trust Agreement, First Security acts solely as Owner
Trustee and not in its individual capacity except as otherwise expressly
provided in this Trust Agreement or in the other Operative Agreements to which
it is a party; and, except as may be otherwise expressly provided in this Trust
Agreement, the Lease, the Participation Agreement and the Trust Indenture, all
persons, other than the Owner Participant as provided in this Trust Agreement or
the Trust Indenture, having any claim against Owner Trustee by reason of the
transactions contemplated hereby shall look only to the Trust Estate for payment
or satisfaction thereof except to the extent provided in Section 6.1 or
otherwise as Owner Trustee shall expressly agree otherwise in writing.

      6.7 FEES; COMPENSATION

      Lessee or Owner Participant shall pay the Transaction Expenses of Owner
Trustee pursuant to Section 9.2 of the Participation Agreement.  The Trust
Estate shall not have any liability for any such fees and expenses; PROVIDED,
that the foregoing shall not limit the obligations of Owner Participant under
Sections 5.3 and 7; PROVIDED, that Owner Trustee shall have a Lien upon the
Trust Estate for any such fee not paid by Lessee or Owner Participant, as the
case may be, as contemplated by Section 9.2 of the Participation Agreement
and such Lien shall entitle Owner Trustee to priority as to payment thereof
over payment to any other Person under this Trust Agreement; PROVIDED, that
such Lien shall be subject and subordinate in all events to the Lien of the
Trust Indenture; and PROVIDED, FURTHER, that Owner Trustee shall have no
right to exercise, and shall not exercise, any rights or remedies Owner
Trustee may have with respect to such Lien unless and until the Secured
Obligations have been paid and performed in full.

      6.8 TAX RETURNS

      Owner Trustee shall be responsible for the keeping of all appropriate
books and records relating to the receipt and disbursement of all monies
under this Trust Agreement or any agreement contemplated hereby.  Owner
Participant shall be responsible for causing to be prepared and filed all
income tax returns required to be filed by Owner Participant.  Owner Trustee
shall be responsible for causing to be prepared, at the request of Owner
Participant and at the expense of Lessee, all income tax returns required to
be filed with respect to the trust created hereby and shall execute and file
such returns; PROVIDED, that Owner Trustee shall send promptly a completed
copy of such return to Owner Participant not more than sixty nor less than
fifteen days prior to the due date of the return, PROVIDED, that Owner
Trustee shall have timely received all necessary information to complete and
deliver to Owner Participant such return.  Owner Participant, upon request,
will furnish Owner Trustee with all such information as may be reasonably
required from Owner Participant in connection with the preparation of such
income tax returns.  Owner Trustee shall keep copies of all returns delivered
to or filed by it.

SECTION 7. INDEMNIFICATION OF FIRST SECURITY BY OWNER PARTICIPANT

      Owner Participant hereby agrees, whether or not any of the transactions
contemplated hereby shall be consummated, to assume liability for, and hereby

<PAGE>

indemnifies, protects, saves and keeps harmless, First Security and its
successors, assigns, agents and servants, from and against any and all
liabilities, obligations, losses, damages, penalties, taxes (excluding any Taxes
which are not required to be indemnified by Lessee pursuant to Section 9.1 or
9.3 of the Participation Agreement and excluding any taxes payable by First
Security on or measured by any compensation received by First Security for its
services under this Trust Agreement), claims, actions, suits, costs, expenses or
disbursements (including, without limitation, reasonable legal fees and
expenses, but excluding internal costs and expenses such as salaries and
overhead, and including, without limitation, any liability of an owner, any
strict liability and any liability without fault) of any kind and nature
whatsoever which may be imposed on, incurred by or asserted against First
Security (whether or not also indemnified against by Lessee under the Lease or
under the Participation Agreement or also indemnified against by any other
Person; PROVIDED, that Owner Participant shall be subrogated to the rights of
Owner Trustee against Lessee or any other indemnitor) in any way relating to or
arising out of this Trust Agreement or any of the other Operative Agreements 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, possession, use, operation, condition, sale, return
or other disposition of the Aircraft (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 Estate or the action or inaction of Owner Trustee,
under this Trust Agreement, except (a) in the case of gross negligence or
willful misconduct on the part of First Security, in its individual capacity or
as Owner Trustee, in the performance or nonperformance of its duties under this
Trust Agreement or under any of the other Owner Trustee Agreements or (b) those
Claims resulting from the inaccuracy of any representation or warranty of First
Security (or from the failure of First Security to perform any of its covenants)
in Section 6.3, in Section 6.03 of the Trust Indenture, in Section 4 of the
Lease, in Section 6.3 of the Participation Agreement or elsewhere in any of the
Operative Agreements or (c) as may result from a breach by First Security of its
covenant in the last sentence of Section 5.4.1 or (d) in the case of the failure
to use ordinary care on the part of First Security, in its individual capacity
or as Owner Trustee, in the receipt or disbursement of funds or in connection
with its obligation to invest funds pursuant to Section 4.4 of the Lease or
Section 4.3 hereof or in compliance with the provisions of the first sentence of
Section 6.8 or (e) any liability on the part of Owner Trustee arising out of its
negligence or willful or negligent misconduct in connection with its obligations
under Section 5.1, 6.8 or 9.2 hereof or Section 4.01 of the Trust Indenture, or
(f) those claims arising under any circumstances or upon any terms where Lessee
would not have been required to indemnify First Security pursuant to Section 9.1
or 9.3 of the Participation Agreement (disregarding for purposes of this
paragraph Sections 9.1.2(b) and 9.3.2(j)); PROVIDED, that before asserting its
right to indemnification, if any, pursuant to this Section 7, First Security
shall first demand its corresponding right to indemnification pursuant to
Section 9 of the Participation Agreement (but need not exhaust any or all
remedies available thereunder). The indemnities contained in this Section 7
extend to First Security only in its individual capacity and shall not be
construed as indemnities of the Trust Indenture Estate or the Trust Estate
(except to the extent, if any, that First Security has been reimbursed by the
Trust Indenture Estate or the Trust Estate for amounts covered by the
indemnities contained in this Section 7). The indemnities contained in this
Section 7 shall survive the termination of this Trust Agreement. In addition, if
necessary, First Security shall be entitled to indemnification from the Trust
Estate, subject to the Lien of the Trust Indenture, for any liability,

<PAGE>

obligation, loss, damage, penalty, tax, claim, action, suit, cost, expense or
disbursement indemnified against pursuant to this Section 7 to the extent not
reimbursed by Lessee, Owner Participant or others, but without releasing any of
them from their respective agreements of reimbursement; and, to secure the same
First Security shall have a lien on the Trust Estate, subject to the lien of the
Trust Indenture and subject further to the provisions of Section 6.7, which
shall be prior to any interest therein of Owner Participant. The payor of any
indemnity under this Section 7 shall be subrogated to any right of the person
indemnified in respect of the matter as to which such indemnity was paid.

SECTION 8. TRANSFER OF OWNER PARTICIPANT'S INTEREST

      8.1 TRANSFER OF INTEREST

      All provisions of Section 10 of the Participation Agreement shall (with
the same force and effect as if set forth in full in this Section 8.1) be
applicable to any assignment, conveyance or other transfer by Owner
Participant of any of its right, title or interest in and to the
Participation Agreement, the Trust Estate or this Trust Agreement.

SECTION 9. SUCCESSOR OWNER TRUSTEES; CO-TRUSTEES

      9.1 RESIGNATION OF OWNER TRUSTEE; APPOINTMENT OF SUCCESSOR

            9.1.1 RESIGNATION OR REMOVAL

      Owner Trustee or any successor Owner Trustee (a) shall resign if
required to do so pursuant to Section 13.3 of the Participation Agreement or
upon obtaining Actual Knowledge of any facts that would cast doubt upon its
continuing status as a Citizen of the United States and (b) may resign at any
time without cause by giving at least 60 days' prior written notice to Owner
Participant, Mortgagee and Lessee, such resignation to be effective upon the
assumption of the trusts hereunder by the successor Owner Trustee under
Section 9.1.2.  In addition, Owner Participant may at any time remove Owner
Trustee, with or without cause by a notice in writing delivered to Owner
Trustee, Mortgagee and Lessee, such removal to be effective upon the
assumption of the trusts hereunder by the successor Owner Trustee under
Section 9.1.2, PROVIDED, that, in the case of a removal without cause, unless
a Lease Event of Default shall have occurred and be continuing, such removal
shall be subject to the consent of Lessee (which consent shall not be
unreasonably withheld).  In the case of the resignation or removal of Owner
Trustee, Owner Participant may appoint a successor Owner Trustee by an
instrument signed by Owner Participant, with, unless a Lease Event of Default
shall have occurred and be continuing, the consent of Lessee (which consent
shall not be unreasonably withheld).  If a successor Owner Trustee shall not
have been appointed within 30 days after such notice of resignation or
removal, Owner Trustee, any Owner Participant, Lessee or Mortgagee may apply
to any court of competent jurisdiction to appoint a successor Owner Trustee
to act until such time, if any, as a successor shall have been appointed as
above provided.  Any successor Owner Trustee so appointed by such court shall
immediately and without further act be superseded by any successor Owner
Trustee appointed as above provided within one year from the date of the
appointment by such court.

<PAGE>

            9.1.2 EXECUTION AND DELIVERY OF DOCUMENTS, ETC.

      Any successor Owner Trustee, however appointed, shall execute and
deliver to the predecessor Owner Trustee, with a copy to Owner Participant,
Lessee and Mortgagee, an instrument accepting such appointment and assuming
the obligations of Owner Trustee, in its individual capacity and as Owner
Trustee, under the Owner Trustee Agreements, and thereupon such successor
Owner Trustee, without further act, shall become vested with all the estates,
properties, rights, powers, duties and trusts of the predecessor Owner
Trustee in the trusts under this Trust Agreement with like effect as if
originally named Owner Trustee in this Trust Agreement; but nevertheless,
upon the written request of such successor Owner Trustee, such predecessor
Owner Trustee shall execute and deliver an instrument transferring to such
successor Owner Trustee, upon the trusts herein expressed, all the estates,
properties, rights, powers and trusts of such predecessor Owner Trustee, and
such predecessor Owner Trustee shall duly assign, transfer, deliver and pay
over to such successor Owner Trustee all monies or other property then held
by such predecessor Owner Trustee upon the trusts herein expressed.  Upon the
appointment of any successor Owner Trustee under this Section 9.1, the
predecessor Owner Trustee will execute such documents as are provided to it
by such successor Owner Trustee and will take such further actions as are
requested of it by such successor Owner Trustee as are required to cause
registration of the Aircraft included in the Trust Estate to be transferred
upon the records of the FAA, or other governmental authority having
jurisdiction, into the name of the successor Owner Trustee.

            9.1.3 QUALIFICATIONS

      Any successor Owner Trustee, however appointed, shall be a Citizen of
the United States and shall also be a bank or trust company organized under
the Laws of the United States or any state thereof having a combined capital
and surplus of at least $100,000,000, if there be such an institution
willing, able and legally qualified to perform the duties of Owner Trustee
under this Trust Agreement upon reasonable or customary terms.  No such
successor Owner Trustee shall be located in a jurisdiction which creates
material adverse consequences for Lessee (unless such material adverse
consequences would be created by substantially all jurisdictions where major
banking or trust institutions are located).

            9.1.4 MERGER, ETC.

      Any corporation into which First Security may be merged or converted or
with which it may be consolidated, or any corporation resulting from any
merger, conversion or consolidation to which First Security shall be a party,
or any corporation to which substantially all the corporate trust business of
First Security may be transferred, shall, subject to the terms of
Section 9.1.3, be Owner Trustee under this Trust Agreement without further
act, PROVIDED, that such corporation shall not also be the Mortgagee.

      9.2 CO-TRUSTEES AND SEPARATE TRUSTEES

      (a) If at any time it shall be necessary or prudent in order to conform to
any Law of any jurisdiction in which all or any part of the Trust Estate is
located, or Owner Trustee being advised by counsel shall determine that it is so
necessary or prudent in the interest of Owner Participant or Owner Trustee, or

<PAGE>

Owner Trustee shall have been directed to do so by Owner Participant, Owner
Trustee and Owner Participant shall execute and deliver an agreement
supplemental hereto and all other instruments and agreements necessary or proper
to constitute another bank or trust company or one or more persons (any or all
of which shall be a Citizen of the United States) approved by Owner Trustee and
Owner Participant, either to act as co-trustee, jointly with Owner Trustee, or
to act as separate trustee under this Trust Agreement (any such co-trustee or
separate trustee being herein sometimes referred to as an "additional trustee").
In the event Owner Participant shall not have joined in the execution of such
agreements' supplemental hereto within ten days after the receipt of a written
request from Owner Trustee so to do, or in case a Lease Event of Default or
Indenture Event of Default shall occur and be continuing, Owner Trustee may act
under the foregoing provisions of this Section 9.2 without the concurrence of
Owner Participant; and Owner Participant hereby appoints Owner Trustee its agent
and attorney-in-fact to act for it under the foregoing provisions of this
Section 9.2 in either of such contingencies.

      (b) Every additional trustee under this Trust Agreement shall, to the
extent permitted by Law, be appointed and act, and Owner Trustee and its
successors shall act, subject to the following provisions and conditions:

            (i) All powers, duties, obligations and rights conferred upon Owner
      Trustee in respect of the custody, control and management of monies, the
      Aircraft or documents authorized to be delivered under this Trust
      Agreement or under the Participation Agreement shall be exercised solely
      by Owner Trustee;

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

            (iii) No power given to, or which it is provided hereby may be
      exercised by, any such additional trustee shall be exercised under this
      Trust Agreement by such additional trustee, except jointly with, or with
      the consent in writing of, Owner Trustee;

            (iv) No trustee under this Trust Agreement shall be personally
      liable by reason of any action or omission of any other trustee under this
      Trust Agreement;

            (v) Owner Participant, at any time, by an instrument in writing may
      remove any such additional trustee. In the event that Owner Participant
      shall not have joined in the execution of any such instrument within ten
      days after the receipt of a written request from Owner Trustee so to do,
      Owner Trustee shall have the power to remove any such additional trustee
      without the concurrence of Owner Participant; and Owner Participant hereby
      appoints Owner Trustee its agent and attorney-in-fact to act for it in
      such connection in such contingency; and

<PAGE>

            (vi) No appointment of, or action by, any additional trustee will
      relieve Owner Trustee of any of its obligations under, or otherwise affect
      any of the terms of, the Trust Indenture or affect the interests of
      Mortgagee or the Certificate Holders in the Trust Indenture Estate.

      (c) In case any separate trustee under this Section 9.2 shall die, become
incapable of acting, resign or be removed, the title to the Trust Estate and all
rights and duties of such separate trustee shall, so far as permitted by Law,
vest in and be exercised by Owner Trustee, without the appointment of a
successor to such separate trustee.

SECTION 10. SUPPLEMENTS AND AMENDMENTS TO TRUST AGREEMENT AND OTHER DOCUMENTS

      10.1 SUPPLEMENTS AND AMENDMENTS AND DELIVERY THEREOF

            10.1.1 SUPPLEMENTS AND AMENDMENTS

      Subject to Section 7.2.2 of the Participation Agreement, this Trust
Agreement may not be amended, supplemented or otherwise modified except by an
instrument in writing signed by Owner Trustee and Owner Participant. Subject to
Section 10.2, Section 9.01 of the Trust Indenture and Section 7.6.7 of the
Participation Agreement, Owner Trustee will execute any amendment, supplement or
other modification of this Trust Agreement or of any other Owner Trustee
Agreement which it is requested in writing to execute by Owner Participant,
except that Owner Trustee shall not execute any such amendment, supplement or
other modification which, by the express provisions of any of the above
documents, requires the consent of any other party unless such consent shall
have been obtained; and PROVIDED, that, without the prior written consent of
Owner Participant, (a) no such supplement, amendment or modification shall (i)
modify any of the provisions of Section 4 or this Section 10.1, (ii) reduce,
modify or amend any indemnities in favor of Owner Participant as set forth in
Section 9 of the Participation Agreement or in the Tax Indemnity Agreement,
(iii) reduce the amount or extend the time of payment of Basic Rent,
Supplemental Rent, Stipulated Loss Value or Termination Value as set forth in
the Lease (except in accordance with Section 3 of the Lease) or (iv) modify any
of the rights of Owner Participant under the Trust Indenture and (b) no such
supplement, amendment or modification shall require Owner Participant to invest
or advance funds or shall entail any additional personal liability or the
surrender of any indemnification, claim or individual right on the part of Owner
Participant with respect to any agreement or obligation.

            10.1.2 DELIVERY OF AMENDMENTS AND SUPPLEMENTS TO CERTAIN PARTIES

      A signed copy of each amendment or supplement referred to in
Section 10.1.1 to which Lessee is not a party shall be delivered promptly by
Owner Trustee to Lessee, and a signed copy of each amendment or supplement
referred to in Section 10.1.1 shall be delivered promptly by Owner Trustee to
Mortgagee.

<PAGE>

      10.2 DISCRETION AS TO EXECUTION OF DOCUMENTS

      Prior to executing any document required to be executed by it pursuant to
the terms of Section 10.1, Owner Trustee shall be entitled to receive an opinion
of its counsel to the effect that the execution of such document is authorized
under this Trust Agreement. If in the opinion of Owner Trustee any such document
adversely affects any right, duty, immunity or indemnity in favor of Owner
Trustee under this Trust Agreement or under any other Owner Trustee Agreement,
Owner Trustee may in its discretion decline to execute such document unless
Owner Trustee is furnished with indemnification from Lessee or any other party
upon terms and in amounts reasonably satisfactory to Owner Trustee to protect
the Trust Estate and the Owner Trustee against any and all liabilities, costs
and expenses arising out of the execution of such documents.

      10.3 ABSENCE OF REQUIREMENTS AS TO FORM

      It shall not be necessary for any written request furnished pursuant to
Section 10.1 to specify the particular form of the proposed documents to be
executed pursuant to such Section 10.1, but it shall be sufficient if such
request shall indicate the substance thereof.

      10.4 DISTRIBUTION OF DOCUMENTS

      Promptly after the execution by Owner Trustee of any document entered
into pursuant to Section 10.1, Owner Trustee shall mail, by certified mail,
postage prepaid, a conformed copy thereof to Owner Participant, but the
failure of Owner Trustee to mail such conformed copy shall not impair or
affect the validity of such document.

      10.5  NO REQUEST NEEDED AS TO LEASE SUPPLEMENT AND TRUST INDENTURE
            SUPPLEMENT

      No written request pursuant to Section 10.1 shall be required to enable
Owner Trustee to enter into, pursuant to Section 3.1 and the Lease or the
Trust Indenture, as the case may be, the Lease Supplement with Lessee and the
Trust Indenture Supplement.

SECTION 11. MISCELLANEOUS

      11.1 TERMINATION OF TRUST AGREEMENT

      This Trust Agreement and the trusts created hereby shall be of no
further force or effect upon the earlier of (a) both the final discharge of
the Trust Indenture pursuant to Section 10.01 thereof and the sale or other
final disposition by Owner Trustee of all property constituting part of the
Trust Estate and the final distribution by Owner Trustee of all monies or
other property or proceeds constituting part of the Trust Estate in
accordance with Section 4, PROVIDED, that at such time Lessee shall have
fully complied with all of the terms of the Lease and the Participation
Agreement or (b) 21 years less one day after the death of the last survivor
of all of the descendants of the grandparents of David C. Rockefeller living
on the date of the earliest execution of this Trust Agreement by any party
hereto, but if this Trust Agreement and the trusts created hereby shall be or
become authorized under applicable Law to be valid for a period commencing on

<PAGE>

the 21st anniversary of the death of such last survivor (or, without limiting
the generality of the foregoing, if legislation shall become effective
providing for the validity of this Trust Agreement and the trusts created
hereby for a period in gross exceeding the period for which this Trust
Agreement and the trusts created hereby are hereinabove stated to extend and
be valid), then this Trust Agreement and the trusts created hereby shall not
terminate under this clause (b) but shall extend to and continue in effect,
but only if such nontermination and extension shall then be valid under
applicable Law, until the day preceding such date as the same shall, under
applicable Law, cease to be valid; otherwise this Trust Agreement and the
trusts created hereby shall continue in full force and effect in accordance
with the terms hereof.  Except as expressly set forth in Section 11.2, this
Trust Agreement and the trusts created hereby may not be revoked by Owner
Participant.

      11.2 TERMINATION AT OPTION OF THE OWNER PARTICIPANT

      Notwithstanding Section 11.1 hereof, this Agreement and trust created
hereby shall terminate and the Trust Estate shall be distributed to the Owner
Participant, and this Agreement shall be of no further force and effect, upon
the election of the Owner Participant by notice to the Owner Trustee, if such
notice shall be accompanied by the written agreement (in form and substance
satisfactory to the Owner Trustee) of the Owner Participant assuming all
obligations of the Owner Trustee under or contemplated by the Operative
Agreements or incurred by it as trustee hereunder and releasing the Owner
Trustee therefrom; provided, however, that such notice may be given only
after the time the Lien of the Trust Indenture is discharged under
Section 10.01 of the Trust Indenture and after the Lease shall no longer be
in effect.

      11.3 OWNER PARTICIPANT HAS NO LEGAL TITLE IN TRUST ESTATE

      No Owner Participant shall have legal title to any part of the Trust
Estate.  No transfer, by operation of Law or otherwise, of any right, title
and interest of Owner Participant in and to the Trust Estate under this Trust
Agreement shall operate to terminate this Trust Agreement or the trusts under
this Trust Agreement or entitle any successors or transferees of Owner
Participant to an accounting or to the transfer of legal title to any part of
the Trust Estate.

      11.4 ASSIGNMENT, SALE, ETC. OF AIRCRAFT

      Any assignment, sale, transfer or other conveyance of the Aircraft by
Owner Trustee made pursuant to the terms of this Trust Agreement or of the
Lease or the Participation Agreement shall bind Owner Participant and shall
be effective to transfer or convey all right, title and interest of Owner
Trustee and Owner Participant 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 assignment, sale, transfer or conveyance or
as to the application of any sale or other proceeds with respect thereto by
Owner Trustee.

      11.5 TRUST AGREEMENT FOR BENEFIT OF CERTAIN PARTIES ONLY

      Except for the terms of Section 10 of the Participation Agreement
incorporated in Section 8 and except as otherwise provided in Sections 5.1,
6.7, 9, 10.1 and 11.1, nothing in this Trust Agreement, whether express or
implied, shall be construed to give any person other than Owner Trustee and

<PAGE>

Owner Participant any legal or equitable right, remedy or claim under or in
respect of this Trust Agreement; and this Trust Agreement shall be held to be
for the sole and exclusive benefit of Owner Trustee and Owner Participant.

      11.6 [RESERVED]

      11.7 NOTICES

      Unless otherwise expressly permitted by the terms of this Trust
Agreement, all notices, requests, demands, authorizations, directions,
consents, waivers and other communications required or permitted to be made,
given, furnished or filed under this Trust Agreement shall be in writing,
shall refer specifically to this Trust Agreement and shall be personally
delivered, sent by telecopy, telex or other means of electronic facsimile or
telecommunication transmission, sent by registered mail or certified mail,
return receipt requested, postage prepaid, or sent by overnight courier
service, in each case to the respective telex, telecopy or other number or
address set forth for such party in Schedule 1 to the Participation
Agreement, or to such other telex, telecopy or other number or address as
each party hereto may hereafter specify by notice to the other parties
hereto.  Each such notice, request, demand, authorization, direction,
consent, waiver or other communication shall be effective when received or,
if made, given, furnished or filed (a) by telecopy or other means of
electronic facsimile or telecommunication transmission, when confirmed, or
(b) by registered or certified mail, three Business Days after being
deposited, properly addressed, in the U.S. mail.

      11.8 SEVERABILITY

      If any provision of this Trust Agreement shall be held invalid, illegal
or unenforceable in any respect in any jurisdiction, then, to the extent
permitted by Law, (a) all other provisions hereof shall remain in full force
and effect in such jurisdiction and (b) such invalidity, illegality or
unenforceability shall not affect the validity, legality or enforceability of
such provision in any other jurisdiction.  If, however, any Law pursuant to
which such provisions are held invalid, illegal or unenforceable may be
waived, such Law is hereby waived by the parties hereto to the full extent
permitted, to the end that this Trust Agreement shall be deemed to be a valid
and binding agreement in all respects, enforceable in accordance with its
terms.

      11.9 WAIVERS, ETC.

      No term or provision hereof may be changed, waived, discharged or
terminated orally, but only by an instrument in writing entered into in
compliance with the terms of Section 10; and any waiver of the terms hereof
shall be effective only in the specific instance and for the specific purpose
given.

      11.10 COUNTERPARTS

      This Trust Agreement and any amendments, waivers, consents or
supplements hereto may be executed in any number of counterparts, each of
which when so executed shall be deemed to be an original, and all of which
counterparts, taken together, shall constitute one and the same instrument.

<PAGE>

      11.11 BINDING EFFECT, ETC.

      All covenants and agreements contained in this Trust Agreement shall be
binding upon, and inure to the benefit of, Owner Trustee and its successors
and assigns, and Owner Participant and its successors and, to the extent
permitted by Section 8, assigns.  Any request, notice, direction, consent,
waiver or other instrument or action by Owner Participant shall bind its
successors and assigns.

      11.12 HEADINGS; REFERENCES

      The headings and the table of contents used in this Trust Agreement are
for convenience of reference only and shall not define or limit any of the
terms or provisions hereof and shall not in any way affect the construction
of, or be taken into consideration in interpreting, this Trust Agreement.

      11.13 GOVERNING LAW

      THIS TRUST AGREEMENT SHALL IN ALL RESPECTS BE GOVERNED BY THE LAWS OF
THE STATE OF UTAH , INCLUDING ALL MATTERS OF CONSTRUCTION, VALIDITY AND
PERFORMANCE, WITHOUT GIVING EFFECT TO PRINCIPLES OF CONFLICTS OF LAWS.

                    [This space intentionally left blank.]

<PAGE>

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

                                          [                                  ]

                                          By
                                            ----------------------------------
                                            Name:
                                            Title:

                                          FIRST SECURITY BANK, NATIONAL
                                          ASSOCIATION

                                          By
                                            ----------------------------------
                                            Name:
                                            Title:================================================================================

                      TRUST INDENTURE AND MORTGAGE [___]

                      Dated as of [____________, 20___]

                                   Between

                  FIRST SECURITY BANK, NATIONAL ASSOCIATION,
                       not in its individual capacity,
                      except as expressly stated herein,
                         but solely as Owner Trustee,

                                Owner Trustee

                                     and

                          WILMINGTON TRUST COMPANY,
                       not in its individual capacity,
                      except as expressly stated herein,
                           but solely as Mortgagee,

                                  Mortgagee

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

                           EQUIPMENT NOTES COVERING
                        ONE BOEING [________] AIRCRAFT
                   BEARING U.S. REGISTRATION MARK N[_____]
                     LEASED BY CONTINENTAL AIRLINES, INC.

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

<PAGE>

                              TABLE OF CONTENTS

                                                                          PAGE

                                  ARTICLE I

                                 DEFINITIONS

                                  ARTICLE II

                             THE EQUIPMENT NOTES

SECTION 2.01.     Form of Equipment Notes...................................7
SECTION 2.02.     Issuance and Terms of Equipment Notes.....................13
SECTION 2.03.     Payments from Trust Indenture Estate Only.................16
SECTION 2.04.     Method of Payment.........................................17
SECTION 2.05.     Application of Payments...................................19
SECTION 2.06.     Termination of Interest in Trust Indenture
                  Estate....................................................20
SECTION 2.07.     Registration Transfer and Exchange of Equipment
                  Notes.....................................................20
SECTION 2.08.     Mutilated, Destroyed, Lost or Stolen Equipment
                  Notes.....................................................21
SECTION 2.09.     Payment of Expenses on Transfer; Cancellation.............22
SECTION 2.10.     Mandatory Redemptions of Equipment Notes..................22
SECTION 2.11.     Voluntary Redemptions of Equipment Notes..................22
SECTION 2.12.     Redemptions; Notice of Redemption.........................23
SECTION 2.13.     Option to Purchase Equipment Notes........................23
SECTION 2.14.     Subordination.............................................24

                                 ARTICLE III

          RECEIPT, DISTRIBUTION AND APPLICATION OFINCOME FROM THE TRUST
                                INDENTURE ESTATE

SECTION 3.01.     Basic Rent Distribution...................................25
SECTION 3.02.     Event of Loss; Replacement; Voluntary
                  Termination; Optional Redemption..........................26
SECTION 3.03.     Payments After Event of Default...........................27
SECTION 3.04.     Certain Payments..........................................30
SECTION 3.05.     Other Payments............................................30
SECTION 3.06.     Payments to Owner Trustee.................................31

                                  ARTICLE IV

     COVENANTS OF OWNER TRUSTEE; EVENTS OFDEFAULT; REMEDIES OF MORTGAGEE

SECTION 4.01.     Covenants of Owner Trustee................................31

<PAGE>

                              TABLE OF CONTENTS
                                 (Continued)
                                                                          PAGE

SECTION 4.02.     Event of Default..........................................32
SECTION 4.03.     Certain Rights............................................34
SECTION 4.04.     Remedies..................................................36
SECTION 4.05.     Return of Aircraft, Etc...................................38
SECTION 4.06.     Remedies Cumulative.......................................39
SECTION 4.07.     Discontinuance of Proceedings.............................40
SECTION 4.08.     Waiver of Past Defaults...................................40
SECTION 4.09.     Appointment of Receiver...................................40
SECTION 4.10.     Mortgagee Authorized to Execute Bills of Sale,
                  Etc.......................................................40
SECTION 4.11.     Rights of Note Holders to Receive Payment.................41

                                  ARTICLE V

                           DUTIES OF THE MORTGAGEE

SECTION 5.01.     Notice of Event of Default................................41
SECTION 5.02.     Action Upon Instructions; Certain Rights and
                  Limitations...............................................41
SECTION 5.03.     Indemnification...........................................44
SECTION 5.04.     No Duties Except as Specified in Trust
                  Indenture or Instructions.................................45
SECTION 5.05.     No Action Except Under Lease, Trust Indenture
                  or Instructions...........................................45
SECTION 5.06.     Replacement Airframes and Replacement Engines.............45
SECTION 5.07.     Indenture Supplements for Replacements....................46
SECTION 5.08.     Effect of Replacement.....................................46
SECTION 5.09.     Investment of Amounts Held by Mortgagee...................46

                                  ARTICLE VI

                     THE OWNER TRUSTEE AND THE MORTGAGEE

SECTION 6.01.     Acceptance of Trusts and Duties...........................47
SECTION 6.02.     Absence of Duties.........................................47
SECTION 6.03.     No Representations or Warranties as to Aircraft
                  or Documents..............................................48
SECTION 6.04.     No Segregation of Monies; No Interest.....................48
SECTION 6.05.     Reliance; Agreements; Advice of Counsel...................49
SECTION 6.06.     Capacity in Which Acting..................................49
SECTION 6.07.     Compensation..............................................49
SECTION 6.08.     Instructions from Note Holders............................50

                                 ARTICLE VII

                INDEMNIFICATION OF MORTGAGEE BY OWNER TRUSTEE

SECTION 7.01.     Scope of Indemnification..................................50

<PAGE>

                              TABLE OF CONTENTS
                                 (Continued)
                                                                          PAGE

                                 ARTICLE VIII

                       SUCCESSOR AND SEPARATE TRUSTEES

SECTION 8.01.     Notice of Successor Owner Trustee.........................51
SECTION 8.02.     Resignation of Mortgagee; Appointment of
                  Successor.................................................51
SECTION 8.03.     Appointment of Additional and Separate Trustees...........52

                                  ARTICLE IX

               SUPPLEMENTS AND AMENDMENTS TO THIS TRUST INDENTURE
                              AND OTHER DOCUMENTS

SECTION 9.01.     Instructions of Majority; Limitations.....................54
SECTION 9.02.     Trustees Protected........................................55
SECTION 9.03.     Documents Mailed to Note Holders..........................56
SECTION 9.04.     No Request Necessary for Lease Supplement or
                  Trust Indenture Supplement................................56

                                  ARTICLE X

                                MISCELLANEOUS

SECTION 10.01.    Termination of Trust Indenture............................56
SECTION 10.02.    No Legal Title to Trust Indenture Estate in
                  Note Holders..............................................57
SECTION 10.03.    Sale of Aircraft by Mortgagee Is Binding..................57
SECTION 10.04.    Trust Indenture for Benefit of Owner Trustee,
                  Mortgagee, Owner Participant, Note Holders and
                  Other Holders of Secured Obligations......................57
SECTION 10.05.    Notices...................................................57
SECTION 10.06.    Severability..............................................58
SECTION 10.07.    No Oral Modification or Continuing Waivers................58
SECTION 10.08.    Successors and Assigns....................................58
SECTION 10.09.    Headings..................................................58
SECTION 10.10.    Normal Commercial Relations...............................58
SECTION 10.11.    Governing Law; Counterpart Form...........................59
SECTION 10.12.    Voting By Note Holders....................................59
SECTION 10.13.    Bankruptcy................................................59

EXHIBIT A         Form of Trust Indenture and Mortgage Supplement

SCHEDULE I        Equipment Notes Amortization and Interest Rates

<PAGE>

                      TRUST INDENTURE AND MORTGAGE [___]

            TRUST INDENTURE AND MORTGAGE [___], dated as of [___________,
20___] ("Trust Indenture"), between FIRST SECURITY BANK, NATIONAL
ASSOCIATION, a national banking association, not in its individual capacity,
except as expressly stated herein, but solely as Owner Trustee under the
Trust Agreement referred to below (together with its successors under the
Trust Agreement, the "Owner Trustee"), and WILMINGTON TRUST COMPANY, a
Delaware banking corporation, not in its individual capacity, except as
expressly stated herein, but solely as Mortgagee hereunder (together with its
successors hereunder, the "Mortgagee").

                             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 the Owner Trustee in its
individual capacity have entered into the Trust Agreement whereby, among
other things, (i) the Owner Trustee has established 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, and with
the priority of payment to, the holders of Equipment Notes issued hereunder,
and (ii) the Owner Trustee has been authorized and directed to execute and
deliver this Agreement;

            WHEREAS, the parties hereto desire by this Trust Indenture, among
other things, (i) to provide for the issuance by the Owner Trustee of the
Series of Equipment Notes specified on Schedule I hereto (it being understood
that not all Series may be issued, in which case references in this Trust
Indenture to Series not issued shall be disregarded) and (ii) to provide for
the assignment, mortgage and pledge by the Owner Trustee to the Mortgagee, as
part of the Trust Indenture Estate hereunder, among other things, of all of
the Owner Trustee's 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 and the Participation Agreement
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 Note Holders;

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

            WHEREAS, all things necessary to make this Trust Indenture the
valid, binding and legal 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 TRUST INDENTURE AND MORTGAGE WITNESSETH,
that, to secure the prompt payment of the Original Amount of, interest on,

<PAGE>

Make-Whole Amount, if any, and all other amounts due with respect to, all
Equipment Notes from time to time outstanding hereunder according to their
tenor and effect and to secure the performance and observance by the Owner
Trustee of all the agreements, covenants and provisions contained herein and
in the Participation Agreement and the Equipment Notes, for the benefit of
the Note Holders, the Loan Participants and other holders of Secured
Obligations and the prompt payment of all amounts from time to time owing
hereunder and under Participation Agreement to the Loan Participants, the
Note Holders and/or other holders of Secured Obligations by the Owner Trustee
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 for
other good and valuable consideration the receipt and adequacy whereof are
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 Mortgagee, its successors in trust and assigns, for the
security and benefit of the Loan Participants, the Note Holders and other
holders of Secured Obligations, a first priority security interest in and
mortgage lien on all right, title and interest of the Owner Trustee in, to
and under the following described property, rights and privileges, whether
now or hereafter acquired, other than Excluded Payments (which, collectively,
excluding Excluded Payments but including all property hereafter specifically
subject to the Lien of this Trust Indenture by the terms hereof or any
supplement hereto, are included within, and are referred to as, the "Trust
Indenture Estate"), to wit:

            (1) The Airframe which is one Boeing [______] aircraft with the FAA
      Registration number of N[_____] and the manufacturer's serial number of
      [_______] and [_________] Engines, each of which Engines is a
      [_______________________] engine with the manufacturer's serial numbers of
      [_____ and _____], is of 750 or more rated takeoff horsepower or the
      equivalent of such horsepower (such Airframe and Engines more particularly
      described in the Indenture Supplement executed and delivered as provided
      herein) as the same is now and will hereafter be constituted, whether now
      owned by the Owner Trustee or hereafter acquired, leased or intended to be
      leased under the Lease, and in the case of such Engines, whether or not
      any such Engine shall be installed in or attached to the Airframe or any
      other airframe, together with (a) all Parts of whatever nature, which are
      from time to time included within the definitions of "Airframe" or
      "Engines", whether now owned or hereafter acquired, including all
      substitutions, renewals and replacements of and additions, improvements,
      accessions and accumulations to the Airframe and Engines (other than
      additions, improvements, accessions and accumulations which constitute
      appliances, parts, instruments, appurtenances, accessories, furnishings or
      other equipment excluded from the definition of Parts) and (b) all
      Aircraft Documents;

            (2) All right, title, interest, claims and demands of the Owner
      Trustee, as Lessor, in, to and under the Lease, together with all rights,
      powers, privileges, options and other benefits of the Owner Trustee as
      lessor under the Lease, including the immediate and continuing right to
      receive and collect all Rent, income, revenues, issues, profits, insurance
      proceeds, condemnation awards and other payments, tenders and security now
      or hereafter payable to or receivable by the Lessor under the Lease
      pursuant thereto, and, subject to Section 5.02 hereof, the right to make
      all waivers and agreements, to give and receive copies of all notices and

<PAGE>

      other instruments or communications, 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 as Lessor under the Lease, to
      take such action upon the occurrence of a Lease Event of Default
      thereunder, including the commencement, conduct and consummation of legal,
      administrative or other proceedings, as shall be permitted by the Lease or
      by Law, and to do any and all other things whatsoever which the Owner
      Trustee or any lessor is or may be entitled to do under or in respect of
      the Lease and any right to restitution from the Lessee or any other Person
      in respect of any determination of invalidity of the Lease;

            [(3)] Each Permitted Sublease assignment and each assigned Permitted
      Sublease (to the extent assigned under such Permitted Sublease
      assignment), and including, without limitation, all rents or other
      payments of any kind made under such assigned Permitted Sublease (to the
      extent assigned under such Permitted Sublease assignment);]<F1>

            [(3)/(4)] All right, title, interest, claims and demands of the
      Owner Trustee in, to and under:

            (a) the Purchase Agreement and the GTA;

            (b) the Purchase Agreement Assignment, with the Consent and
Agreement and the Engine Consent and Agreement attached thereto;

            (c) the Bills of Sale; and

            (d) any and all other contracts, agreements and instruments relating
to the Airframe and Engines or any rights or interests therein to which the
Owner Trustee is now or may hereafter be a party;

            together with all rights, powers, privileges, licenses,
      easements, options and other benefits of the Owner Trustee under each
      contract, agreement and instrument referred to in this clause
      [(3)/(4)], including the right to receive and collect all payments to
      the Owner Trustee thereunder now or hereafter payable to or receivable
      by the Owner Trustee pursuant thereto and, subject to Section 5.02
      hereof, the right to make all waivers and agreements, to give and
      receive notices and other instruments or communications, or to take any
      other action under or in respect of any thereof or to take such action
      upon the occurrence of a default thereunder, including the
      commencement, conduct and consummation of legal, administrative or
      other proceedings, as shall be permitted thereby or by Law, and to do
      any and all other things which the Owner Trustee is or may be entitled
      to do thereunder and any right to restitution from the Lessee, the

----------
<F1>
Insert bracketed language if the Lease provides for the assignment of a
permitted sublease.

<PAGE>

      Owner Participant or any other Person in respect of any determination
      of invalidity of any thereof;

            [(4)/(5)] All rents, issues, profits, revenues and other income of
      the property subjected or required to be subjected to the Lien of this
      Trust Indenture, including 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;

            [(5)/(6)] Without limiting the generality of the foregoing, all
      insurance and requisition proceeds with respect to the Aircraft or any
      part thereof, including the insurance required under Section 11 of the
      Lease;

            [(6)/(7)] Without limiting the generality of the foregoing, all
      rights of the Owner Trustee to amounts paid or payable by Lessee to the
      Owner Trustee under the Participation Agreement and all rights of the
      Owner Trustee to enforce payments of any such amounts thereunder;

            [(7)/(8)] Without limiting the generality of the foregoing, all
      monies and securities from time to time deposited or required to be
      deposited with the Mortgagee pursuant to any terms of this Trust Indenture
      or the Lease or required hereby or by the Lease to be held by the
      Mortgagee hereunder as security for the obligations of the Lessee under
      the Lease or of the Owner Trustee hereunder; and

            [(8)/(9)] All proceeds of the foregoing; excluding, however, in all
      events from each of foregoing clauses (1) through [(8)/(9)] inclusive all
      Excluded Payments and the right to specifically enforce the same or to sue
      for damages for the breach thereof as provided in Section 5.02 hereof.

            Concurrently with the delivery of this Trust Indenture, the Owner
Trustee will deliver to the Mortgagee the original executed counterpart of
the Lease and the Lease Supplement No. 1 (to each of which a chattel paper
receipt is attached), and executed copies of the Participation Agreement, the
Purchase Agreement and the GTA (to the extent assigned by the Purchase
Agreement Assignment), the Purchase Agreement Assignment, with the Consent
and Agreement and the Engine Consent and Agreement attached thereto.

            TO HAVE AND TO HOLD all and singular the aforesaid property unto
the Mortgagee, and its successors and assigns, in trust for the equal and
proportionate benefit and security of the Loan Participants, the Note Holders
and the other holders of Secured Obligations, except as provided in Section
2.14 and Article III hereof without any preference, distinction or priority
of any one Equipment Note over any other by reason of priority of time of
issue, sale, negotiation, date of maturity thereof or otherwise for any
reason whatsoever, and for the uses and purposes and in all cases and as to
all property specified in clauses (1) through [(8)/(9)] inclusive above,
subject to the terms and provisions set forth in this Trust Indenture.

            It is expressly agreed that anything herein contained to the
contrary notwithstanding, the Owner Trustee shall remain liable under the

<PAGE>

Indenture Agreements, to perform all of the obligations assumed by it
thereunder, except to the extent prohibited or excluded from doing so
pursuant to the terms and provisions thereof, and the Mortgagee, the Loan
Participants, the Note Holders and the other holders of Secured Obligations
shall have no obligation or liability under the Indenture Agreements, by
reason of or arising out of the assignment hereunder, nor shall the
Mortgagee, the Loan Participants, the Note Holders or the other holders of
Secured Obligations be required or obligated in any manner to perform or
fulfill any obligations of the Owner Trustee under or pursuant to the
Indenture Agreements, or, except as herein expressly provided, to make any
payment, or to make any inquiry as to the nature or sufficiency of any
payment received by it, or present or file any claim, or take any action to
collect or enforce the payment of any amounts which may have been assigned to
it or to which it may be entitled at any time or times.

            The Owner Trustee does hereby constitute the Mortgagee the true
and lawful attorney of the Owner Trustee, irrevocably, granted for good and
valuable consideration and coupled with an interest and with full power of
substitution, and with full power (in the name of the Owner Trustee or
otherwise) to ask for, require, demand, receive, compound and give
acquittance for any and all monies and claims for monies (in each case
including insurance and requisition proceeds but in all cases excluding
Excluded Payments) due and to become due under or arising out of the
Indenture Agreements, and all other property which now or hereafter
constitutes part of the Trust 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 Mortgagee may
deem to be necessary or advisable in the premises.  Without limiting the
generality of the foregoing, but subject to the rights of the Owner Trustee
and the Owner Participant under Sections 2.13, 4.03 and 4.04(a) hereof,
during the continuance of any Event of Default under this Trust Indenture,
the Mortgagee shall have the right under such power of attorney to accept any
offer in connection with the exercise of remedies as set forth herein of any
purchaser to purchase the Airframe and Engines and upon such purchase to
execute and deliver in the name of and on behalf of the Owner Trustee an
appropriate bill of sale and other instruments of transfer relating to the
Airframe and Engines, when purchased by such purchaser, and to perform all
other necessary or appropriate acts with respect to any such purchase, and in
its discretion to file any claim or take any other action or proceedings,
either in its own name or in the name of the Owner Trustee or otherwise,
which the Mortgagee may deem necessary or appropriate to protect and preserve
the right, title and interest of the Mortgagee in and to such Rents and other
sums and the security intended to be afforded hereby; PROVIDED, HOWEVER, that
no action of the Mortgagee pursuant to this paragraph shall increase the
obligations or liabilities of the Owner Trustee to any Person beyond those
obligations and liabilities specifically set forth in this Trust Indenture
and in the other Operative Agreements.  Under the Lease, Lessee is directed,
so long as this Trust Indenture shall not have been fully discharged, to make
all payments of Rent (other than Excluded Payments) and all other amounts
which are required to be paid to or deposited with the Owner Trustee pursuant
to the Lease (other than Excluded Payments) directly to, or as directed by,
the Mortgagee at such address or addresses as the Mortgagee shall specify,
for application as provided in this Trust Indenture.  The Owner Trustee
agrees that promptly upon receipt thereof, it will transfer to the Mortgagee
any and all monies from time to time received by it constituting part of the
Trust Indenture Estate, for distribution by the Mortgagee pursuant to this
Trust Indenture, except that the Owner Trustee shall accept for distribution
pursuant to the Trust Agreement any amounts distributed to it by the
Mortgagee under this Trust Indenture.

<PAGE>

            The Owner Trustee agrees that at any time and from time to time,
upon the written request of the Mortgagee, 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 Mortgagee may
reasonably deem 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 Mortgagee 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 and agrees that it will not
assign or pledge, so long as the assignment hereunder shall remain in effect,
and the Lien hereof shall not have been released pursuant to Section 10.01
hereof, any of its right, title or interest hereby assigned, to anyone other
than the Mortgagee, and that it will not, except as otherwise provided in
this Trust Indenture and except with respect to Excluded Payments to which it
is entitled, (i) accept any payment from Lessee [or any Permitted Sublessee]<F2>
under any Indenture Agreement, (ii) enter into any agreement amending or
supplementing any Indenture Agreement, (iii) execute any waiver or
modification of, or consent under, the terms of, or exercise any rights,
powers or privileges under, any Indenture Agreement, (iv) settle or
compromise any claim arising under any Indenture Agreement or (v) submit or
consent to the submission of any dispute, difference or other matter arising
under or in respect of any Indenture Agreement to arbitration thereunder.

            The Owner Trustee does hereby agree that it will not without the
written consent of the Mortgagee:

            (a) receive or collect or agree to the receipt or collection of any
payment (other than Excluded Payments) of Rent, including Basic Rent, Stipulated
Loss Value, Termination Value or any other payment to be made pursuant to
Section 9 or 10 of the Lease prior to the date for the payment thereof provided
for by the Lease or assign, transfer or hypothecate (other than to the Mortgagee
hereunder) any payment of Rent (other than Excluded Payments), including Basic
Rent, Stipulated Loss Value, Termination Value or any other payment to be made
pursuant to Section 9 or 10 of the Lease, then due or to accrue in the future
under the Lease in respect of the Airframe and Engines; or

            (b) except as contemplated by the Trust Agreement in connection with
the appointment of a successor owner trustee, sell, mortgage, transfer, assign
or hypothecate (other than to the Mortgagee hereunder) its interest in the
Airframe and Engines or any part thereof or in any amount to be received by it
from the use or disposition of the Airframe and Engines, other than amounts
distributed to it pursuant to Article III hereof.

            It is hereby further agreed that any and all property described
or referred to in the granting clauses hereof which is hereafter acquired by
the Owner Trustee shall IPSO FACTO, and without any other conveyance,
assignment or act on the part of the Owner Trustee or the Mortgagee, become

----------
<F2>
Insert bracketed language if the Lease provides for the assignment of a
permitted sublease.

<PAGE>

and be subject to the Lien herein granted as fully and completely as though
specifically described herein, but nothing contained in this paragraph shall
be deemed to modify or change the obligations of the Owner Trustee contained
in the foregoing paragraphs.

            The Owner Trustee does hereby ratify and confirm the Lease and
does hereby agree that it will not violate any covenant or agreement made by
it therein, herein or in any other Owner Trustee Agreement.

            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 Excluded 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 2.13, 4.03, 4.04, 4.08, 5.02 or 5.03 hereof.

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

                                  ARTICLE I

                                 DEFINITIONS

            Capitalized terms used but not defined herein shall have the
respective meanings set forth or incorporated by reference, and shall be
construed in the manner described, in Annex A to the Lease.

                                  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.

            FIRST SECURITY BANK, NATIONAL ASSOCIATION, AS OWNER TRUSTEE UNDER
TRUST AGREEMENT [___] DATED AS OF [_______________, 20___].  SERIES [_____]
LIMITED RECOURSE EQUIPMENT NOTE DUE [____] ISSUED IN CONNECTION WITH THE
BOEING MODEL [_______] AIRCRAFT BEARING UNITED STATES REGISTRATION NUMBER
N[_____].

No. ____                                             Date: [ __________, 20___ ]

<PAGE>

                            $_______________________

       INTEREST RATE                                         MATURITY DATE

      [_____________]                                       [_____________]

            FIRST SECURITY BANK, NATIONAL ASSOCIATION, not in its individual
capacity but solely as Owner Trustee (herein in such capacity called the "Owner
Trustee") under that certain Trust Agreement [___], dated as of [____________,
20___], between the Owner Participant named therein and First Security Bank,
National Association (herein as such Trust Agreement may be supplemented or
amended from time to time called the "Trust Agreement"), hereby promises to pay
to __________________, or the registered assignee thereof, the principal sum of
$____________ (the "Original Amount"), together with interest on the amount of
the Original 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. The Original
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 Original
Amount of this Equipment Note set forth in Schedule I hereto.]<F3> [paid in full
on ____________.]<F4> Accrued but unpaid interest shall be due and payable in
semiannual installments commencing on [_____________, 20___], and thereafter on
[_______] and [_______] of each year, to and including [_______________].
Notwithstanding the foregoing, the final payment made on this Equipment Note
shall be in an amount sufficient to discharge in full the unpaid Original Amount
and all accrued and unpaid interest on, and any other amounts due under, this
Equipment Note. Notwithstanding anything to the contrary contained herein, 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 "Trust Indenture" means the Trust
Indenture and Mortgage [___], dated as of [_____________, 20___], between the
Owner Trustee and Wilmington Trust Company (the "Mortgagee"), 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 Trust Indenture.

            This Equipment Note shall bear interest, payable on demand, at
the Payment Due Rate (calculated on the basis of a year of 360 days comprised
of twelve 30-day months) on any overdue Original 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

----------
<F3>
Not included in Series A-2 Equipment Notes.

<F4>
To be inserted in the case of a Series A-2 Equipment Note.

<PAGE>

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 Original Amount, interest, Make-Whole Amount, if
any, and other amounts, if any, to be made by the Owner Trustee hereunder and
under the Trust Indenture or the Participation 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 Mortgagee to make
such payments in accordance with the terms of Section 2.03 and Article III of
the Trust 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 Mortgagee is personally liable or liable in any
manner 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 Trust Indenture or in the Participation
Agreement, for any liability under the Trust Indenture or the Participation
Agreement; PROVIDED, HOWEVER, that nothing herein contained shall limit,
restrict or impair the right of the Mortgagee, subject always to the terms
and provisions of the Trust Indenture, to accelerate the maturity of this
Equipment Note upon occurrence of an Event of Default under the Trust
Indenture in accordance with Section 4.04(b) of the Trust Indenture, to bring
suit and obtain a judgment against the Owner Trustee on this Equipment Note
for purposes of realizing upon the Trust Indenture Estate and to exercise all
rights and remedies provided under the Trust Indenture or otherwise realize
upon the Trust Indenture Estate as provided under the Trust Indenture.

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

            The Original Amount and interest and other amounts due hereunder
shall be payable in Dollars in immediately available funds at the Corporate
Trust Office of the Mortgagee, or as otherwise provided in the Trust
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 Mortgagee for
cancellation.

            The holder hereof, by its acceptance of this Equipment Note,
agrees that, except as provided in the Trust Indenture, each payment of the
Original Amount, Make-Whole Amount, if any, and interest 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 Original Amount, any
overdue Make-Whole Amount, if any, or, to the extent permitted by Law, any
overdue interest and other amounts hereunder) to the date of such payment,
SECOND, to the payment of the Original 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 Trust Indenture, and FOURTH, the balance, if any,
remaining thereafter, to the payment of installments of the Original Amount
of this Equipment Note remaining unpaid in the inverse order of their
maturity.

<PAGE>

            This Equipment Note is one of the Equipment Notes referred to in
the Trust Indenture which have been or are to be issued by the Owner Trustee
pursuant to the terms of the Trust Indenture.  The Trust Indenture Estate is
held by the Mortgagee as security, in part, for the Equipment Notes.  The
provisions of this Equipment Note are subject to the Trust Indenture.
Reference is hereby made to the Trust Indenture for a complete statement of
the rights and obligations of the holder 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 Trust Indenture, as well as
for a statement of the terms and conditions of the Trust created by the Trust
Indenture, to all of which terms and conditions in the Trust Indenture each
holder hereof agrees by its acceptance of this Equipment Note.

            As provided in the Trust Indenture and subject to certain
limitations therein set forth, this Equipment Note is exchangeable for a like
aggregate Original 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 Mortgagee 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 the
Owner Trustee nor the Mortgagee shall be affected by notice to the contrary.

            This Equipment Note is subject to redemption as provided in
Sections 2.10, 2.11 and 2.12 of the Trust Indenture but not otherwise.  This
Equipment Note is also subject to exchange and to purchase by the Owner
Participant or the Owner Trustee as provided in Section 2.13 of the Trust
Indenture but not otherwise.  In addition, this Equipment Note may be
accelerated as provided in Section 4.04 of the Trust Indenture.

            [The indebtedness evidenced by this Equipment Note is, to the extent
and in the manner provided in the Trust Indenture, subordinate and subject in
right of payment to the prior payment in full of the Secured Obligations (as
defined in the Trust Indenture) in respect of [Series A-1 and Series A-2
Equipment Notes]<F5> [Series A-1, Series A-2 and Series B Equipment Notes]<F6>
[Series A-1, Series A-2, Series B and Series C Equipment Notes],<F7> 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 Mortgagee on his behalf to take such
action as may be necessary or appropriate to effectuate the subordination as
provided in the Trust Indenture and (c) appoints the Mortgagee his
attorney-in-fact for such purpose.]<F8>

----------
<F5>
To be inserted in the case of a Series B Equipment Note.

<F6>
To be inserted in the case of a Series C Equipment Note.

<F7>
To be inserted in the case of a Series D Equipment Note.

<F8>
To be inserted for each Equipment Note other than any Series A-1 or Series A-2
Equipment Note.

<PAGE>

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

            THIS EQUIPMENT NOTE SHALL BE GOVERNED BY AND CONSTRUED IN
ACCORDANCE WITH THE INTERNAL LAWS OF THE STATE OF NEW YORK.

                                    * * *

<PAGE>

            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.

                                          FIRST SECURITY BANK, NATIONAL
                                          ASSOCIATION,
                                              not in its individual capacity
                                              but solely as Owner Trustee

                                          By:
                                             -------------------------------
                                             Name:
                                             Title:

<PAGE>

                    MORTGAGEE'S CERTIFICATE OF AUTHENTICATION

            This is one of the Equipment Notes referred to in the
within-mentioned Trust Indenture.
                                          WILMINGTON TRUST COMPANY, as
                                          Mortgagee

                                          By
                                             -------------------------------
                                             Name:
                                             Title:

                                  SCHEDULE I<F9>

                           EQUIPMENT NOTE AMORTIZATION

                                                      Percentage of
                                                     Original Amount
           Payment 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 up to six separate series consisting of Series A-1, Series
A-2, 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 Transaction, each Equipment Note shall be
issued to the Subordination Agent on behalf of the Applicable Pass Through

----------
<F9>
Not included in Series A-2 Equipment Notes.

<PAGE>

Trustees under the Applicable Pass Through Trust Agreements.  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 Original Amount thereof from time to time outstanding,
payable in arrears on [_____________, 20___], and on each [_______] and
[_______] thereafter until maturity.  The Original Amount of each Equipment
Note (i) in the case of Equipment Notes other than Series A-2 Equipment
Notes, shall be payable on the dates and in the installments equal to the
corresponding percentage of the Original Amount as set forth in Schedule I
hereto which shall be attached as Schedule I to such Equipment Notes, and
(ii) in the case of Series A-2 Equipment Notes, shall be payable in full on
[__________].  Notwithstanding the foregoing, the final payment made under
each Equipment Note shall be in an amount sufficient to discharge in full the
unpaid Original 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 Payment Due Rate (calculated on the basis of a year of 360
days comprised of twelve 30-day months) on any part of the Original 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 Mortgagee for distribution
in accordance with Section 3.04 hereof: (i) any and all indemnity amounts
which are payable by the Lessee to (x) WTC and the Mortgagee, (y) each
separate or additional Trustee appointed pursuant to the Trust Indenture and
(z) the Pass Through Indemnitees pursuant to Section 9 of the Participation
Agreement; (ii) to the extent not payable (whether or not in fact paid) under
Section 6(a) of the Note Purchase Agreement (as originally in effect or
amended with the consent of the Owner Participant), an amount equal to the
fees payable to the Liquidity Provider under Section 2.03 of each Liquidity
Facility and the related Fee Letter (as defined in the Intercreditor

<PAGE>

Agreement) multiplied by a fraction the numerator of which shall be the then
outstanding aggregate principal amount of the Series A-1 Equipment Notes,
Series A-2 Equipment Notes, Series B Equipment Notes and Series C Equipment
Notes and the denominator of which shall be the then outstanding aggregate
principal amount of all "Series A-1 Equipment Notes", "Series A-2 Equipment
Notes", "Series B Equipment Notes" and "Series C Equipment Notes" (each as
defined in the Note Purchase Agreement); (iii) (x) the amount equal to
interest on any Downgrade Advance (other than any Applied Downgrade Advance)
payable under Section 3.07 of each Liquidity Facility minus Investment
Earnings from such Downgrade Advance multiplied by (y) the fraction specified
in the foregoing clause (ii); (iv) (x) the amount equal to interest on any
Non-Extension Advance (other than any Applied Non-Extension Advance) payable
under Section 3.07 of each Liquidity Facility minus Investment Earnings from
such Non-Extension Advance multiplied by (y) the fraction specified in the
foregoing clause (ii); (v) any amounts owed to the Liquidity Providers by the
Subordination Agent as borrower under the second sentence of Section 7.05 of
each Liquidity Facility (other than as a result of any "prohibited
transaction" within the meaning of Section 406 of the Employee Retirement
Income Security Act of 1974, as amended, or Section 4975(c)(1) of the
Internal Revenue Code of 1986, as amended) multiplied by the fraction
specified in the foregoing clause (ii); and (vi) if any payment default shall
have occurred and be continuing with respect to interest on any Series A-1
Equipment Notes, Series A-2 Equipment Notes, Series B Equipment Notes or
Series C Equipment Notes, (x) the excess, if any, of (1) the amount equal to
interest on any Unpaid Advance, Applied Downgrade Advance or Applied
Non-Extension Advance payable under Section 3.07 of each Liquidity Facility
OVER (2) the sum of Investment Earnings from any Final Advance plus any
amount of interest at the Payment Due Rate actually payable (whether or not
in fact paid) by the Owner Trustee on the overdue scheduled interest on the
Equipment Notes in respect of which such Unpaid Advance, Applied Downgrade
Advance or Applied Non-Extension Advance was made, multiplied by (y) a
fraction the numerator of which shall be the then aggregate overdue amounts
of interest on the Series A-1 Equipment Notes, Series A-2 Equipment Notes,
Series B Equipment Notes and Series C Equipment Notes (other than interest
becoming due and payable solely as a result of acceleration of any such
Equipment Notes) and the denominator of which shall be the then aggregate
overdue amounts of interest on all "Series A-1 Equipment Notes", "Series A-2
Equipment Notes", "Series B Equipment Notes" and "Series C Equipment Notes"
(each as defined in the Note Purchase Agreement) (other than interest
becoming due and payable solely as a result of acceleration of any such
"Equipment Notes").  For purposes of this paragraph, the terms "Applied
Downgrade Advance", "Applied Non-Extension Advance", "Cash Collateral
Account", "Downgrade Advance", "Final Advance", "Investment Earnings",
"Non-Extension Advance" and "Unpaid Advance" shall have the meanings
specified in each Liquidity Facility or the Intercreditor Agreement referred
to therein.

            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 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 Mortgagee for authentication upon original
issue and such Equipment Notes shall thereupon be authenticated and delivered
by the Mortgagee 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 Original 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 entitled to any benefit under this Trust 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 Mortgagee by the manual signature of one of its
authorized officers and such certificate upon any Equipment Notes be
conclusive evidence, and the only evidence, that such Equipment Note has been
duly authenticated and delivered hereunder.

<PAGE>

            The aggregate Original Amount of the Equipment Notes issued
hereunder shall not exceed [__]% of Lessor's Cost.

      SECTION 2.03. PAYMENTS FROM TRUST INDENTURE ESTATE ONLY.

            (a) Without impairing any of the other rights, powers, remedies,
privileges, liens or security interests of the Note Holders under this Trust
Indenture, each Note Holder, by its acceptance of an Equipment Note, agrees that
as between it and the Owner Trustee, except as expressly provided in this Trust
Indenture, the Participation Agreement or any other Operative Agreement, (i) the
obligation to make all payments of the Original 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 Trust Indenture and in the Participation Agreement or
any of the other Operative Agreements, 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 Mortgagee 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 Trust Indenture and any agreement referred
to herein 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 Trust
Indenture or such other agreements to the contrary notwithstanding (except for
any express provisions or representations that the Owner Trustee is responsible
for, or is making, in its individual capacity, for which there would be personal
liability of the Owner Trustee), no recourse shall be had with respect to this
Trust Indenture or such other agreements against the Owner Trustee in its
individual capacity 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 Owner Trustee, in its individual capacity, the Owner
Participant, the Mortgagee 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 hereunder,
under the Participation Agreement or any of the other Operative Agreements or
under the Equipment Notes except as expressly provided herein, in the Lease or
in the Participation Agreement; PROVIDED, HOWEVER, that nothing contained in
this Section 2.03(a) shall be construed to limit the exercise and enforcement in
accordance with the terms of this Trust Indenture or such other agreements of
rights and remedies against the Trust Indenture Estate. These provisions are not
intended as any release or discharge of the indebtedness represented by the
Equipment Notes and the Trust Indenture, but are intended only as a covenant not
to sue the Owner Participant, the Owner Trustee or the Mortgagee in their
individual capacities, except as expressly provided herein or in the
Participation Agreement, for a deficiency with respect to such indebtedness, the
indebtedness represented by this Trust Indenture and the Equipment Notes to
remain in full force and effect as fully as though these provisions were not
contained in this Trust Indenture. The Owner Trustee hereby acknowledges that
the Note Holders have expressly reserved all their rights and remedies against
the Trust Indenture Estate, including the right, in the event of a default in
the payment of all or part of the Original Amount of, interest on, Make-Whole
Amount, if any, or any other amount due with respect to any Equipment Note
within the periods provided for in Section 4.02(b) hereof, or upon the

<PAGE>

occurrence and continuation of any other Event of Default under this Trust
Indenture, to foreclose upon this Trust Indenture, and/or to receive the
proceeds from the Trust Indenture Estate and otherwise to enforce any other
right under this Trust Indenture. Nothing in this Section 2.03(a) shall (x)
release the Owner Participant from personal liability, or constitute a covenant
not to sue the Owner Participant, for any breach by it of any of its covenants,
representations or warranties contained in the Participation Agreement or for
any of the payments it has agreed to make pursuant to the Participation
Agreement or (y) release the Owner Trustee or constitute a covenant not to sue
the Owner Trustee for any breach by it of any representations, warranties or
covenants of the Owner Trustee contained in the Operative Agreements or (z)
release the Owner Trustee in its individual capacity from personal liability, or
constitute a covenant not to sue the Owner Trustee in its individual capacity
for any breach by it of any representations, warranties or covenants of the
Owner Trustee made in its individual capacity in the Operative Agreements.

            (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
Owner Trustee (in its individual capacity) or the Owner Participant is required,
by reason of the Owner Trustee (in its individual capacity) or the Owner
Participant being held to have recourse liability to any Note Holder or the
Mortgagee, directly or indirectly (other than the recourse liability of the
Owner Trustee (in its individual capacity) or the Owner Participant under the
Participation Agreement, the Lease or this Trust Indenture or by separate
agreement), to make payment on account of any amount payable as principal,
Make-Whole Amount, if any, interest or other amounts on the Equipment Notes and
(iii) any Note Holder or the Mortgagee actually receives any Excess Amount (as
hereinafter defined) which reflects any payment by the Owner Trustee (in its
individual capacity) or the Owner Participant on account of clause (ii) above,
then such Note Holder or the Mortgagee, as the case may be, shall promptly
refund to the Owner Trustee (in its individual capacity) 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 Trustee if the Owner Trustee (in its individual
capacity) 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 Mortgagee from enforcing
any personal recourse obligation (and retaining the proceeds thereof) of the
Owner Trustee (in its individual capacity) or the Owner Participant under the
Participation Agreement, the Lease or this Trust Indenture (and any exhibits
or annexes hereto or thereto) or from retaining any amount paid by Owner
Participant under Section 2.13 or 4.03 hereof.

      SECTION 2.04. METHOD OF PAYMENT.

            (a) The Original 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 12:30
p.m., New York City time, on the due date of payment to the Mortgagee at the
Corporate Trust Office for distribution among the Note Holders in the manner
provided herein. The Owner Trustee shall not have any responsibility for the

<PAGE>

distribution of such payment to any Note Holder. Notwithstanding the foregoing
or any provision in any Equipment Note to the contrary, the Mortgagee 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 Trust 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 Mortgagee shall fail to make any such
payment as provided in the immediately foregoing sentence after its receipt of
funds at the place and prior to the time specified above, the Mortgagee, in its
individual capacity and not as trustee, agrees to compensate such holders for
loss of use of funds at the Debt Rate until such payment is made and the
Mortgagee shall be entitled to any interest earned on such funds until such
payment is made. Any payment made hereunder shall be made 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 Mortgagee for cancellation promptly after such payment.
Notwithstanding any other provision of this Trust Indenture to the contrary, the
Mortgagee 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
Mortgagee to do so in view of the time of day when the funds to be so
transferred were received by it if such funds were received after 12:30 p.m.,
New York City time, at the place of payment. Prior to the due presentment for
registration of transfer of any Equipment Note, the Owner Trustee and the
Mortgagee shall deem and treat the Person in whose name any Equipment Note is
registered on the Equipment Note 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 none of the
Owner Trustee or the Mortgagee shall be affected by any notice to the contrary.
So long as any signatory to the Participation 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 I thereto and otherwise in the manner
provided in or pursuant to the Participation Agreement unless it shall have
specified some other account or manner of payment by notice to the Mortgagee
consistent with this Section 2.04.

            (b) The Mortgagee, as agent for the Owner Trustee, shall exclude and
withhold at the appropriate rate from each payment of Original 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 Mortgagee 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 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 may reasonably request from time to time.

<PAGE>

            If a Note Holder which is a Non-U.S. Person has furnished to the
Mortgagee a properly completed, accurate 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 Mortgagee of
the withdrawal or inaccuracy of such form prior to the date of such payment
(and the Mortgagee has no reason to believe that any information set forth in
such form is inaccurate), the Mortgagee shall withhold only the amount, if
any, required by Law (after taking into account any applicable exemptions
properly 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.  If a Note Holder (x) which is a Non-U.S. Person has
furnished to the Mortgagee a properly completed, accurate and currently
effective U.S. Internal Revenue Service Form W-8ECI in duplicate (or such
successor certificate, form or forms as may be required by the United States
Treasury Department as necessary in order to properly avoid withholding of
United States federal income tax), for each calendar year in which a payment
is made (but prior to the making of any payment for such year), and has not
notified the Mortgagee of the withdrawal or inaccuracy of such certificate or
form prior to the date of such payment (and the Mortgagee has no reason to
believe that any information set forth in such form is inaccurate) or (y)
which is a U.S. Person has furnished to the Mortgagee a properly completed,
accurate 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 Mortgagee
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 is 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 Mortgagee
agrees to withhold from each payment due to the relevant Note Holder
withholding taxes at the appropriate rate under Law 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 Law.

            Neither the Owner Trustee nor the Owner Participant shall have
any liability for the failure of the Mortgagee to withhold taxes in the
manner provided for herein or for any false, inaccurate or untrue evidence
provided by any Note Holder hereunder, and Mortgagee shall pay, indemnify,
protect, defend and hold the Owner Participant and the Owner Trustee harmless
on an after-tax basis against any Taxes imposed as a result of such failure
by the Mortgagee.

      SECTION 2.05. APPLICATION OF PAYMENTS.

            In the case of each Equipment Note, each payment of Original
Amount, Make-Whole Amount, if any, and interest due thereon shall be applied:

            First:  to the payment of accrued interest on such Equipment Note
      (as well as any interest on any overdue Original 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;

<PAGE>

            Second:  to the payment of the Original 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 Original 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, 2.11 and 2.12 hereof).

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

      SECTION 2.06. TERMINATION OF INTEREST IN TRUST INDENTURE ESTATE.

            No Note Holder shall, as such, have any further interest in, or
other right with respect to, the Trust Indenture Estate when and if the
Original 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 due and payable hereunder (including, without limitation, under the
third paragraph of Section 2.02 hereof) and under the other Operative
Agreements by the Owner Trustee (collectively, the "Secured Obligations")
shall have been paid in full.

      SECTION 2.07. REGISTRATION TRANSFER AND EXCHANGE OF EQUIPMENT NOTES.

            The Mortgagee shall keep a register (the "Equipment Note
Register") in which the Mortgagee 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 Equipment Note Register shall be kept at the
Corporate Trust Office of the Mortgagee.  The Mortgagee is hereby appointed
"Equipment Note 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 Mortgagee 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.  Upon surrender for registration of
transfer of any Equipment Note, the Owner Trustee shall execute, and the
Mortgagee shall authenticate and deliver, in the name of the designated
transferee or transferees, one or more new Equipment Notes of a like
aggregate Original 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 Original Amount, upon surrender
of the Equipment Notes to be exchanged to the Mortgagee at the Corporate
Trust Office.  Whenever any Equipment Notes are so surrendered for exchange,
the Owner Trustee shall execute, and the Mortgagee 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

<PAGE>

under Section 2.08 hereof or otherwise under this Trust 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 Trust
Indenture, as the Equipment Notes surrendered upon such registration of
transfer or exchange.  Every Equipment Note presented or surrendered for
registration of transfer shall (if so required by the Mortgagee) be duly
endorsed, or be accompanied by a written instrument of transfer in form
satisfactory to the Mortgagee duly executed by the Note Holder or such
holder's attorney duly authorized in writing, and the Mortgagee 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
Mortgagee shall make a notation on each new Equipment Note of the amount of
all payments of Original 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 Original Amount marked on such new Equipment
Note, as provided above, shall be deemed to have been made thereon.  The
Owner Trustee shall not be required to exchange any surrendered Equipment
Notes as provided above during the ten-day period preceding the due date of
any payment on such Equipment Note.  The Owner Trustee shall in all cases
deem the Person in whose name any Equipment Note shall have been issued and
registered as the absolute owner and holder of such Equipment Note for the
purpose of receiving payment of all amounts payable by the Owner Trustee with
respect to such Equipment Note and for all purposes until a notice stating
otherwise is received from the Mortgagee and such change is reflected on the
Equipment Note Register.  The Mortgagee will promptly notify the Owner
Trustee and the 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 Participation Agreement
applicable to Note Holders, and shall be deemed to have covenanted to the
parties to the Participation Agreement as to the matters covenanted by the
original Loan Participant in the Participation Agreement.  Subject to
compliance by the Note Holder and its transferee (if any) of the requirements
set forth in this Section 2.07, Mortgagee and 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 Mortgagee shall authenticate and deliver
in replacement thereof a new Equipment Note, payable in the same Original
Amount dated the same date and captioned as issued in connection with the
Aircraft.  If the Equipment Note being replaced has become mutilated, such
Equipment Note shall be surrendered to the Mortgagee and a photocopy 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 Owner Trustee and the Mortgagee such security or
indemnity as may be required by them to save the Owner Trustee and the
Mortgagee harmless and evidence satisfactory to the Owner Trustee and the
Mortgagee of the destruction, loss or theft of such Equipment Note and of the
ownership thereof.  If a "qualified institutional buyer" of the type referred
to in paragraph (a)(1)(i)(A), (B), (D) or (E) of Rule 144A under the

<PAGE>

Securities Act (a "QIB") is the holder of any such destroyed, lost or stolen
Equipment Note, then the written indemnity of such QIB, signed by an
authorized officer thereof, in favor of, delivered to and in form reasonably
satisfactory to Lessee, Owner Trustee and Mortgagee 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.  Subject to compliance by the Note Holder with the
requirements set forth in this Section 2.08, Mortgagee and Owner Trustee
shall use all reasonable efforts to issue new Equipment Notes within 10
Business Days of the date of the written request therefor from the Note
Holder.

      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 Mortgagee, as
Equipment Note 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.

            (b) The Mortgagee shall cancel all Equipment Notes surrendered for
replacement, redemption, transfer, exchange, payment or cancellation and shall
destroy the canceled Equipment Notes.

      SECTION 2.10. MANDATORY REDEMPTIONS OF EQUIPMENT NOTES.

            (a) On the date on which Lessee is required pursuant to Section
10.1.2 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 Original Amount thereof, together with all
accrued interest thereon to the date of redemption and all other Secured
Obligations owed or then due and payable to the Note Holders but without
Make-Whole Amount.

            (b) If the Lease is terminated with respect to the Aircraft by
Lessee pursuant to Section 9 thereof, on the date the Lease is so terminated,
all the Equipment Notes shall be redeemed in whole at a redemption price equal
to 100% of the unpaid Original Amount thereof, together with accrued interest
thereon to the date of redemption and all other amounts then due and payable
hereunder and under the Participation Agreement and all other Operative
Agreements to the Note Holders plus Make-Whole Amount, if any.

      SECTION 2.11. VOLUNTARY REDEMPTIONS OF EQUIPMENT NOTES.

            All (but not less than all) of the Equipment Notes may be
redeemed by the Owner Trustee in connection with a transaction described in,
and subject to the terms and conditions of, Section 11 of the Participation
Agreement upon at least 30 days' revocable prior written notice to the
Mortgagee and the Note Holders, and such Equipment Notes shall, as provided
in Section 11 of the Participation Agreement, be redeemed in whole at a
redemption price equal to 100% of the unpaid Original Amount thereof,
together with accrued interest thereon to the date of redemption and all
other Secured Obligations owed or then due and payable to the Note Holders
plus (except as provided in Section 11 of the Participation Agreement)
Make-Whole Amount, if any.

<PAGE>

      SECTION 2.12. 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 Trust Indenture. No purchase of any
Equipment Note may be made by the Mortgagee.

            (b) Notice of redemption with respect to the Equipment Notes shall
be given by the Mortgagee by first-class mail, postage prepaid, mailed not less
than 20 nor more than 60 days prior to the applicable redemption date, to each
Note Holder of such Equipment Notes to be redeemed, at such Note Holder's
address appearing in the Equipment Note Register; PROVIDED that, in the case of
a redemption to be made pursuant to Section 2.10(b) or Section 2.11, such notice
shall be revocable and shall be deemed revoked in the event that the Lease does
not in fact terminate on the specified termination date or if notice of such
redemption shall have been given in connection with a refinancing of Equipment
Notes and the Mortgagee receives written notice of such revocation from the
Lessee or the Owner Trustee not later than three days prior to the redemption
date. All notices of redemption 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, if any such Equipment Notes are then outstanding,
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 on the redemption
date shall not then be held in the Trust Indenture Estate, deposit or cause to
be deposited with the Mortgagee by 12:00 noon on the redemption date in
immediately available funds the redemption price of the Equipment Notes to be
redeemed.

            (d) Notice of redemption having been given as aforesaid (and not
deemed revoked as contemplated in the proviso to Section 2.12(b)), the Equipment
Notes to be redeemed shall, on the redemption date, become due and payable at
the Corporate Trust Office of the Mortgagee or at any office or agency
maintained for such purposes pursuant to Section 2.07, 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 in accordance
with said notice, such Equipment Note shall be redeemed at the redemption price.
If any Equipment Note called for redemption 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 2.13. OPTION TO PURCHASE EQUIPMENT NOTES.

            The Owner Trustee and the Owner Participant may, upon the events
and subject to the terms and conditions and for the price set forth in this
Section 2.13, purchase all but not less than all of the Equipment Notes
outstanding hereunder, and each Note Holder agrees that it will, upon such

<PAGE>

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 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 Equipment Notes held by
it, and such purchaser or its nominee shall assume all of such holder's
obligations under the Participation Agreement and hereunder.

            Such option to purchase the Equipment Notes may be exercised by
the Owner Trustee or the Owner Participant at any time following the
occurrence of any of the following events, and in any such event the purchase
price thereof shall equal for each Equipment Note, the aggregate unpaid
Original Amount thereof, plus accrued and unpaid interest thereon to, but not
including, the date of purchase and all other Secured Obligations owed, or
then due and payable hereunder, to the holder thereof (including under the
third paragraph of Section 2.02 hereof).  Such option to purchase the
Equipment Notes may be exercised (x) upon a Mortgagee Event or (y) in the
event there shall have occurred and be continuing a Lease Event of Default
PROVIDED that if such option is exercised pursuant to clause (y) at a time
when there shall have occurred and be continuing for less than 120 days a
Lease Event of Default, the purchase price thereof shall equal the price
provided in the preceding sentence plus the Make-Whole Amount, if any.

            Such option to purchase the Equipment Notes may be exercised by
the Owner Trustee or the Owner Participant giving written notice of its
election of such option to the Mortgagee, which notice shall specify a date
for such purchase within 30 days of the date of such notice.  The Mortgagee
shall promptly send a copy of such notice to each Note Holder.  The Mortgagee
shall not exercise any of the remedies hereunder and, without the consent of
the Owner Trustee or the Owner Participant, under the Lease, during the
period from the time that an 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
sixteenth day following the giving of written notice as provided above.

            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, charges and expenses required pursuant to Section 2.09 in
connection with the issuance of such new Equipment Note shall be borne by the
Owner Participant.

      SECTION 2.14. 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) hereof, except as expressly provided in Article
III hereof.

<PAGE>

            (b) By the acceptance of its Equipment Notes of any Series (other
than Series A-1 and Series A-2), 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 2.14 or Article III
hereof, it will hold any amount so received in trust for the Senior Holder (as
defined in Section 2.14(c) hereof) and will forthwith turn over such payment to
the Mortgagee in the form received to be applied as provided in Article III
hereof.

            (c) As used in this Section 2.14, the term "Senior Holder" shall
mean, (i) the Note Holders of Series A-1 and Series A-2 until the Secured
Obligations in respect of Series A-1 and Series A-2 Equipment Notes have been
paid in full, (ii) after the Secured Obligations in respect of Series A-1 and
Series A-2 Equipment Notes have been paid 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. BASIC RENT DISTRIBUTION.

            Except as otherwise provided in Sections 3.02 and 3.03 hereof,
each installment of Basic Rent, any payment of interest on overdue
installments of Basic Rent and any payment received by the Mortgagee pursuant
to Section 4.03 hereof 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 Original
            Amount and interest (as well as any interest on any overdue Original
            Amount and, to the extent permitted by Law, on any overdue interest)
            then due under all Series A-1 and Series A-2 Equipment Notes shall
            be distributed to the Note Holders of Series A-1 and Series A-2
            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-1 and Series A-2 Equipment Note bears to the aggregate
            amount of the payments then due under all Series A-1 and Series A-2
            Equipment Notes;

      (ii)  after giving effect to paragraph (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 Original Amount
            and interest (as well as any interest on any overdue Original Amount
            and, to the extent permitted by Law, on interest) then due 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

<PAGE>

            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 paragraph (ii) 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 Original Amount
            and interest (as well as any interest on any overdue Original Amount
            and, to the extent permitted by Law, on any overdue interest) then
            due 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 paragraph (iii) above, so much of such
            payment remaining as shall be required to pay in full the aggregate
            amount of the payment or payments of Original Amount and interest
            (as well as any interest on any overdue Original Amount and, to the
            extent permitted by Law, on any overdue interest) then due 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 remaining thereafter shall
            be distributed to the Owner Trustee; PROVIDED, HOWEVER, that if an
            Event of 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 Mortgagee as part of the Trust Indenture
            Estate and invested in accordance with Section 5.09 hereof until
            whichever of the following shall first occur: (i) all Events of
            Default shall have been cured or waived, in which event such balance
            shall be distributed as provided in this clause "Second", (ii)
            Section 3.03 hereof shall be applicable, in which event such balance
            shall be distributed in accordance with the provisions of such
            Section 3.03, or (iii) the 120th day after the receipt of such
            payment in which case such payment shall be distributed as provided
            in this clause "Second".

      SECTION 3.02. EVENT OF LOSS; REPLACEMENT; VOLUNTARY TERMINATION; OPTIONAL
                    REDEMPTION.

            Except as otherwise provided in Section 3.03 hereof, any payments
received by the Mortgagee (i) with respect to the Airframe or the Airframe
and one or more Engines as the result of an Event of Loss, (ii) pursuant to a
voluntary termination of the Lease pursuant to Section 9 thereof, or (iii)
pursuant to an optional redemption of the Equipment Notes pursuant to Section
11 of the Participation Agreement shall be applied to redemption of the
Equipment Notes and to all other Secured Obligations by applying such funds
in the following order of priority:

FIRST,      (a) to reimburse the Mortgagee and the Note Holders for any
            reasonable costs or expenses incurred in connection with such

<PAGE>

            redemption for which they are entitled to reimbursement, or
            indemnity by Lessee, under the Operative Agreements and then (b) to
            pay any other amounts then due to the Mortgagee and the Note Holders
            under this Trust Indenture, the Participation Agreement or the
            Equipment Notes and any and all amounts payable pursuant to the
            third paragraph of Section 2.02 (other than amounts specified in
            clause Second below);

SECOND, (i) to pay the amounts specified in paragraph (i) of clause "Third" of
            Section 3.03 hereof plus Make-Whole Amount, if any, then due and
            payable in respect of the Series A-1 and Series A-2 Equipment Notes;

      (ii)  after giving effect to paragraph (i) above, to pay the amounts
            specified in paragraph (ii) of clause "Third" of Section 3.03 hereof
            plus Make-Whole Amount, if any, then due and payable in respect of
            the Series B Equipment Notes;

      (iii) after giving effect to paragraph (ii) above, to pay the amounts
            specified in paragraph (iii) of clause "Third" of Section 3.03
            hereof plus Make-Whole Amount, if any, then due and payable in
            respect of the Series C Equipment Notes; and

      (iv)  after giving effect to paragraph (iii) above, to pay the amounts
            specified in paragraph (iv) of clause "Third" of Section 3.03 hereof
            plus Make-Whole Amount, if any, then due and payable in respect of
            the Series D Equipment Notes; and

THIRD,      as provided in clause "Fourth" of Section 3.03 hereof;

PROVIDED,  HOWEVER, that if a Replacement Airframe or Replacement Engine shall
be  substituted  for the  Airframe or Engine  subject to such Event of Loss as
provided  in  Section  10 of the Lease and in  accordance  with  Section  5.06
hereof,  any  insurance,  condemnation  or similar  proceeds which result from
such  Event of Loss and are paid  over to the  Mortgagee  shall be held by the
Mortgagee  as  permitted  by Section  6.04 hereof  (provided  that such moneys
shall be invested as provided in Section 5.09 hereof) as  additional  security
for the  obligations  of Lessee  under the Lessee  Operative  Agreements  and,
unless  otherwise  applied  pursuant  to the Lease,  such  proceeds  (and such
investment  earnings) shall be released to the Lessee at the Lessee's  written
request  upon  the  release  of  such  damaged  Airframe  or  Engine  and  the
replacement thereof as provided in the Lease.

      SECTION 3.03.     PAYMENTS AFTER EVENT OF DEFAULT.

            Except as otherwise provided in Section 3.04 hereof, all payments
received and amounts held or realized by the Mortgagee (including any amounts
realized by the Mortgagee from the exercise of any remedies pursuant to
Section 15 of the Lease or Article IV hereof) after an Event of Default shall
have occurred and be continuing and after the declaration specified in
Section 4.04(b) hereof, as well as all payments or amounts then held by the
Mortgagee as part of the Trust Indenture Estate, shall be promptly
distributed by the Mortgagee in the following order of priority:

<PAGE>

FIRST,      so much of such payments or amounts as shall be required to (i)
            reimburse the Mortgagee or WTC for any tax (except to the extent
            resulting from a failure of the Mortgagee to withhold taxes pursuant
            to Section 2.04(b) hereof), expense or other loss (including,
            without limitation, all amounts to be expended at the expense of, or
            charged upon the rents, revenues, issues, products and profits of,
            the property included in the Trust Indenture Estate (all such
            property being herein called the "Mortgaged Property") pursuant to
            Section 4.05(b) hereof) incurred by the Mortgagee or WTC (to the
            extent not previously reimbursed), the expenses of any sale, or
            other proceeding, reasonable attorneys' fees and expenses, court
            costs, and any other expenditures incurred or expenditures or
            advances made by the Mortgagee, WTC or the Note Holders in the
            protection, exercise or enforcement of any right, power or remedy or
            any damages sustained by the Mortgagee, WTC or any Note Holder,
            liquidated or otherwise, upon such Event of Default shall be applied
            by the Mortgagee as between itself, WTC and the Note Holders in
            reimbursement of such expenses and any other expenses for which the
            Mortgagee, WTC or the Note Holders are entitled to reimbursement
            under any Operative Agreement and (ii) pay any and all amounts
            payable to WTC or the Mortgagee hereunder and any and all amounts
            payable pursuant to the third paragraph of Section 2.02 (other than
            amounts specified in clauses Second and Third below); and in the
            case the aggregate amount to be so distributed is insufficient to
            pay as aforesaid in clauses (i) and (ii), then ratably, without
            priority of one over the other, in proportion to the amounts owed
            each hereunder;

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 such then existing or prior Note
            Holders ratably, without priority of one over the 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 hereof;

THIRD, (i)  so much of such payments or amounts remaining as shall be required
            to pay in full the aggregate unpaid Original Amount of all Series
            A-1 and Series A-2 Equipment Notes, and the accrued but unpaid
            interest and other amounts due thereon (other than Make-Whole Amount
            which shall not be due and payable) and all other Secured
            Obligations in respect of the Series A-1 and Series A-2 Equipment
            Notes (other than Make-Whole Amount) to the date of distribution,
            shall be distributed to the Note Holders of Series A-1 and Series
            A-2, 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 Original Amount of all Series A-1 and Series A-2 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 Original Amount of all Series A-1 and Series A-2 Equipment
            Notes held by all such holders plus the accrued but unpaid interest
            and other amounts due thereon (other than Make-Whole Amount) to the
            date of distribution;

<PAGE>

      (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 Original Amount of all Series B Equipment Notes,
            and the accrued but unpaid interest and other amounts due thereon
            (other than Make-Whole Amount which shall not be due and payable)
            and all other Secured Obligations in respect of the Series B
            Equipment Notes (other than Make-Whole Amount) 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 Original 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 the Make-Whole Amount, if any)
            to the date of distribution, bears to the aggregate unpaid Original
            Amount of all Series B Equipment Notes held by all such holders plus
            the accrued but unpaid interest and other amounts due thereon (other
            than the Make-Whole Amount) 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 Original Amount of all Series C Equipment
            Notes, and the accrued but unpaid interest and other amounts due
            thereon (other than Make-Whole Amount which shall not be due and
            payable) and all other Secured Obligations in respect of the Series
            C Equipment Notes (other than Make-Whole Amount) 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 Original 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 the Make-Whole Amount, if any)
            to the date of distribution, bears to the aggregate unpaid Original
            Amount of all Series C Equipment Notes held by all such holders plus
            the accrued but unpaid interest and other amounts due thereon (other
            than the Make-Whole Amount) 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 Original Amount of all Series D Equipment
            Notes, and the accrued but unpaid interest and other amounts due
            thereon (other than Make-Whole Amount which shall not be due and
            payable) and all other Secured Obligations in respect of the Series
            D Equipment Notes (other than Make-Whole Amount) 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 Original 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 the Make-Whole Amount, if any)
            to the date of distribution, bears to the aggregate unpaid Original

<PAGE>

            Amount of all Series D Equipment Notes held by all such holders plus
            the accrued but unpaid interest and other amounts due thereon (other
            than the Make-Whole Amount) 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.

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

      SECTION 3.04. CERTAIN PAYMENTS.

            (a) Any payments received by the Mortgagee for which no provision as
to the application thereof is made in this Trust Indenture and for which such
provision is made in the Lease or the Participation Agreement shall be applied
forthwith to the purpose for which such payment was made in accordance with the
terms of the Lease or the Participation Agreement, as the case may be.

            (b) Notwithstanding anything to the contrary contained in this
Article III, the Mortgagee will distribute promptly upon receipt any indemnity
payment received by it from the Owner Trustee or Lessee in respect of the
Mortgagee in its individual capacity, any Note Holder, WTC, the Mortgagee, each
separate or additional Trustee appointed pursuant to the Trust Indenture or the
Pass Through Indemnitees, in each case whether pursuant to Section 9 of the
Participation Agreement or as Supplemental Rent, directly to the Person entitled
thereto. Subject to the foregoing sentence of this Section 3.04(b), any payment
received by the Mortgagee under the third paragraph of Section 2.02 shall be
distributed to the Subordination Agent to be distributed in accordance with the
terms of the Intercreditor Agreement.

            (c) Notwithstanding anything to the contrary contained in this
Article III, any payments received by the Mortgagee which constitute Excluded
Payments shall be distributed promptly upon receipt by the Mortgagee directly to
the Person or Persons entitled thereto.

            (d) Notwithstanding any provision of this Trust Indenture to the
contrary, any amounts held by Mortgagee pursuant to the terms of the Lease [or
any Permitted Sublease assignment]<F10> shall be held by the Mortgagee as
security for the obligations of Lessee under the Lessee Operative Agreements
and, if and when required by the Lease, paid and/or applied in accordance with
the applicable provisions of the Lease.

      SECTION 3.05. OTHER PAYMENTS.

            Any payments received by the Mortgagee for which no provision as to
the application thereof is made in the Lease, the Participation Agreement,

----------
<F10>
Insert bracketed language if the Lease provides for the assignment of a
permitted sublease.

<PAGE>

elsewhere in this Trust Indenture or in any other Operative Agreement shall be
distributed by the Mortgagee to the extent received or realized at any time (i)
prior to the payment in full of all Secured Obligations due the Note Holders, in
the order of priority specified in Section 3.01 hereof subject to the proviso
thereto, and (ii) after payment in full of all Secured Obligations, 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 Agreements or for which the Lessee is obligated to
            indemnify against thereunder, in the manner provided in clause
            "First" of Section 3.03 hereof, and

SECOND,     in the manner provided in clause "Fourth" of Section 3.03 hereof.

            Further, and except as otherwise provided in Sections 3.02, 3.03
and 3.04 hereof, all payments received and amounts realized by the Mortgagee
under the Lease or otherwise with respect to the Aircraft (including, without
limitation, all amounts realized upon the sale or release of the Aircraft
after the termination of the Lease with respect thereto), to the extent
received or realized at any time after payment in full of all Secured
Obligations due the Note Holders, shall be distributed by the Mortgagee in
the order of priority specified in clause (ii) of the immediately preceding
sentence of this Section 3.05.

      SECTION 3.06. PAYMENTS TO OWNER TRUSTEE.

            Any amounts distributed hereunder by the Mortgagee to the Owner
Trustee shall be paid to the Owner Trustee (within the time limits
contemplated by Section 2.04(a)) by wire transfer of funds of the type
received by the Mortgagee 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 Mortgagee from time to time.  The Owner Trustee hereby
notifies the Mortgagee that unless and until the Mortgagee 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 or clause "Fourth"
of Section 3.03 hereof shall be distributed by wire transfer of funds of the
type received by the Mortgagee to the Owner Participant's account (within the
time limits contemplated by Section 2.04(a)) specified in Schedule 1 to the
Participation Agreement.

                                  ARTICLE IV

                 COVENANTS OF OWNER TRUSTEE; EVENTS OF DEFAULT;
                              REMEDIES OF MORTGAGEE

      SECTION 4.01. COVENANTS OF OWNER TRUSTEE.

            The Owner Trustee hereby covenants and agrees (the covenants and
agreements only in clause (b) below being made by the Owner Trustee in its
individual capacity) as follows:

            (a) the Owner Trustee will duly and punctually pay the Original
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

<PAGE>

Equipment Notes and this Trust Indenture and all amounts, if any, payable by it
to the Note Holders under the Participation Agreement or Section 9 of the Lease;

            (b) the Owner Trustee in its individual capacity covenants and
agrees that it shall not, directly or indirectly, cause or permit to exist a
Lessor Lien attributable to it in its individual capacity with respect to the
Aircraft or any other portion of the Trust Estate; that it will promptly, at its
own expense, take such action as may be necessary to duly discharge such Lessor
Lien attributable to it in its individual capacity; and that it will make
restitution to the Trust Indenture Estate for any actual diminution of the
assets of the Trust Estate resulting from such Lessor Liens attributable to it
in its individual capacity;

            (c) in the event the Owner Trustee shall have Actual Knowledge of an
Event of Default, a Default or an Event of Loss, the Owner Trustee will give
prompt written notice of such Event of Default, Default or Event of Loss to the
Mortgagee, each Note Holder, Lessee and the Owner Participant;

            (d) the Owner Trustee will furnish to the Note Holders and the
Mortgagee, promptly upon receipt thereof, duplicates or copies of all reports,
notices, requests, demands, certificates and other instruments furnished to the
Owner Trustee under the Lease, including, without limitation, a copy of each
report or notice received pursuant to Section 9 or 8.2 or Annex D, Paragraph E
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 Note Holders or the Mortgagee
pursuant to the Lease;

            (e) except with the consent of the Mortgagee (acting pursuant to
instructions given in accordance with Section 9.01 hereof) or as provided in
Sections 2, 11 and 16 of the Participation Agreement, the Owner Trustee will not
contract for, create, incur, assume or suffer to exist any Debt, and will not
guarantee (directly or indirectly or by an instrument having the effect of
assuring another's payment or performance on any obligation or capability of so
doing, or otherwise), endorse or otherwise be or become contingently liable,
directly or indirectly, in connection with the Debt of any other person; and

            (f) the Owner Trustee will not enter into any business or other
activity other than the business of owning the Aircraft, the leasing thereof to
Lessee and the carrying out of the transactions contemplated hereby and by the
Lease, the Participation Agreement and the Trust Agreement and the other
Operative Agreements.

      SECTION 4.02. EVENT OF DEFAULT.

            "Event of Default" means any of the following events (whatever
the reason for such 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 (provided that any such Lease Event
of Default caused solely by a failure of Lessee to pay to the Owner Trustee or
the Owner Participant when due any amount that is included in the definition of
Excluded Payments shall not constitute an Event of Default unless notice is

<PAGE>

given by the Owner Trustee to the Mortgagee that such failure shall constitute
an Event of Default); or

            (b) the failure of the Owner Trustee to pay when due any payment of
Original Amount of, interest on, Make-Whole Amount, if any, or other amount due
and payable under any Equipment Note or hereunder (other than as a result of a
Lease Event of Default or a Lease Default) and such failure shall have continued
unremedied for ten Business Days in the case of any payment of Original Amount
or interest or Make-Whole Amount, if any, thereon and, in the case of any other
amount, for ten Business Days after the Owner Trustee or the Owner Participant
receives written demand from the Mortgagee or any Note Holder; or

            (c) any Lien required to be discharged by the Owner Trustee, in its
individual capacity pursuant to Section 4.01(b) hereof or in its individual or
trust capacity pursuant to Section 7.3.1 of the Participation Agreement, or by
the Owner Participant pursuant to Section 7.2.1 of the Participation Agreement
shall remain undischarged for a period of 30 days after the Owner Trustee or the
Owner Participant, as the case may be, shall have received written notice from
the Mortgagee or any Note Holder of such Lien; or

            (d) any representation or warranty made by the Owner Participant or
the Owner Trustee in the Participation Agreement or this Trust Indenture or in
any certificate furnished by the Owner Participant or the Owner Trustee to the
Mortgagee or any Note Holder in connection with the transactions contemplated by
the Operative Agreements shall prove to have been false or incorrect when made
in any material respect and continues to be material and adverse to the
interests of the Mortgagee or the Note Holders; and if such misrepresentation is
capable of being corrected and if such correction is being sought diligently,
such misrepresentation shall not have been corrected within 60 days (or, without
affecting Section 4.02(f) hereof, in the case of the representation made in
Section 6.3.6 or 6.2.6 of the Participation Agreement as to citizenship of the
Owner Trustee in its individual capacity or of the Owner Participant,
respectively, as soon as is reasonably practicable but in any event within 60
days) following notice thereof from the Mortgagee or any Note Holder to the
Owner Trustee or the Owner Participant, as the case may be; or

            (e) other than as provided in (c) above or (f) below, any failure by
the Owner Trustee or Owner Participant to observe or perform any other covenant
or obligation of the Owner Trustee or Owner Participant, as the case may be, for
the benefit of the Mortgagee or the Note Holders contained in the Participation
Agreement, Section 4.2.1 of the Trust Agreement, the Equipment Notes or this
Trust Indenture which is not remedied within a period of 60 days after notice
thereof has been given to the Owner Trustee and the Owner Participant; or

            (f) if at any time when the Aircraft is registered under the Laws of
the United States, the Owner Participant shall not be a "citizen of the United
States" within the meaning of Section 40102(a)(15) of Part A of Subtitle VII of
Title 49, United States Code, and as the result thereof the registration of the
Aircraft under the Federal Aviation Act, and regulations then applicable
thereunder, shall cease to be effective; provided that no Event of Default shall
be deemed to have occurred under this paragraph (f) unless such circumstances
continue unremedied for more than 60 days after the Owner Participant has Actual
Knowledge of the state of facts that resulted in such ineffectiveness and of
such loss of citizenship; or

<PAGE>

            (g) at any time either (i) the commencement of an involuntary case
or other proceeding in respect of the Owner Participant, the Owner Trustee, the
Trust or the Trust Estate under the federal bankruptcy Laws, as now constituted
or hereafter amended, or any other applicable federal or state bankruptcy,
insolvency or other similar Law in the United States or seeking the appointment
of a receiver, liquidator, assignee, custodian, trustee, sequestrator (or
similar official) of the Owner Participant, the Owner Trustee, the Trust or the
Trust Estate or for all or substantially all of its property, or seeking the
winding-up or liquidation of its affairs and the continuation of any such case
or other proceeding undismissed and unstayed for a period of 60 consecutive
days; or (ii) the commencement by the Owner Participant, the Owner Trustee, the
Trust or the Trust Estate of a voluntary case or proceeding under the federal
bankruptcy Laws, as now constituted or hereafter amended, or any other
applicable federal or state bankruptcy, insolvency or other similar Law in the
United States, or the consent by the Owner Participant, the Owner Trustee, the
Trust or the Trust Estate to the appointment of or taking possession by a
receiver, liquidator, assignee, trustee, custodian, sequestrator (or other
similar official) of the Owner Participant, the Owner Trustee, the Trust or the
Trust Estate or for all or substantially all of its property, or the making by
the Owner Participant, the Owner Trustee, the Trust or the Trust Estate of any
assignment for the benefit of creditors or the Owner Participant or the Owner
Trustee shall take any action to authorize any of the foregoing; PROVIDED,
HOWEVER, that an event referred to in this Section 4.02(g) with respect to the
Owner Participant shall not constitute an Event of Default if within 30 days of
the commencement of the case or proceeding a final non-appealable order,
judgment or decree shall be entered in such case or proceeding by a court or a
trustee, custodian, receiver or liquidator, to the effect that, no part of the
Trust Estate (except for the Owner Participant's beneficial interest therein)
and no right, title or interest under the Trust Indenture Estate shall be
included in, or be subject to, any declaration or adjudication of, or
proceedings with respect to, the bankruptcy, insolvency or liquidation of the
Owner Participant referred to in this Section 4.02(g).

      SECTION 4.03. CERTAIN RIGHTS.

            The Mortgagee shall give the Note Holders, the Owner Trustee and
the Owner Participant prompt written notice of any Event of Default of which
the Mortgagee has Actual Knowledge and shall give the Note Holders, the Owner
Trustee and the Owner Participant not less than ten Business Days' prior
written notice of the date (the "Enforcement Date") on or after which the
Mortgagee may, subject to the limitation set forth in Section 4.04(a),
commence and consummate the exercise of any remedy or remedies described in
Section 4.04, 4.05 or 4.06 hereof; provided, however, that in the event the
Mortgagee shall have validly terminated the Lease, the Mortgagee shall not
sell or lease, or otherwise afford the use of, the Aircraft or any portion
thereof to the Lessee or any Affiliate thereof.  Without limiting the
generality of the foregoing, the Mortgagee shall give the Owner Trustee, the
Owner Participant and the Lessee at least ten Business Days' prior written
notice (which may be given concurrently with notice of the Enforcement Date)
of any declaration of the Lease to be in default pursuant to Sections 14 and
15 of the Lease or any termination of the Lease or of the exercise of any
remedy or remedies pursuant to Section 15 of the Lease.  If an Event of
Default shall have occurred and be continuing, the Owner Trustee shall have
the rights set forth below, any of which may be exercised directly by the
Owner Participant.

<PAGE>

            If as a result of the occurrence of an Event of Default in
respect of the nonpayment by Lessee of Basic Rent due under the Lease, the
Mortgagee shall have insufficient funds to make any payment of Original
Amount and interest on any Equipment Note on the day it becomes due and
payable, the Owner Trustee may, but shall not be obligated to pay the
Mortgagee prior to the Enforcement Date, in the manner provided in Section
2.04 hereof, for application in accordance with Section 3.01 hereof, an
amount equal to the portion of the Original Amount and interest (including
interest, if any, on any overdue payments of such portion of Original Amount
and interest) then due and payable on the Equipment Notes, and, unless the
Owner Trustee has cured Events of Default in respect of payments of Basic
Rent on each of the three immediately preceding Basic Rent payment dates (or,
for so long as any Affiliate of The Boeing Company is the Owner Participant,
six immediately preceding Basic Rent payment dates), or the Owner Trustee has
cured six previous Events of Default (or for so long as any Affiliate of The
Boeing Company is the Owner Participant, eight previous Events of Default) in
respect of payments of Basic Rent, such payment by the Owner Trustee shall,
solely for purposes of this Trust Indenture be deemed to cure any Event of
Default which would otherwise have arisen on account of the nonpayment by
Lessee of such installment of Basic Rent (but not any other Default or Event
of Default which shall have occurred and be continuing).

            If any Event of Default (other than in respect of the nonpayment
of Basic Rent by the Lessee) which can be cured by the payment of money has
occurred, the Owner Trustee may, but shall not be obligated to, cure such
Event of Default by making such payment prior to the Enforcement Date as is
necessary to accomplish the observance or performance of the defaulted
covenant, condition or agreement to the party entitled to the same.

            Except as hereinafter in this Section 4.03 provided, the Owner
Trustee shall not, as a result of exercising the right to cure any such Event
of Default, obtain any Lien on any of the Mortgaged Property or any Rent
payable under the Lease for or on account of costs or expenses incurred in
connection with the exercise of such right, nor shall any claim of the Owner
Trustee against Lessee or any other party for the repayment of such costs or
expenses impair the prior right and security interest of the Mortgagee in and
to the Mortgaged Property.  Upon any payment by the Owner Trustee pursuant to
the first or second preceding paragraphs of this Section 4.03, the Owner
Trustee shall be subrogated to the rights of the Mortgagee and the Note
Holders in respect of the Basic Rent which was overdue at the time of such
payment and interest payable by the Lessee on account of its being overdue
and any Supplemental Rent in respect of the reimbursement of amounts paid by
Owner Trustee pursuant to the immediately preceding paragraph (but in either
case shall have no rights as a secured party hereunder), and thereafter, the
Owner Trustee shall be entitled (so long as the application thereof shall not
give rise to an Event of Default hereunder) to receive such overdue Basic
Rent or Supplemental Rent, as the case may be, and interest thereon upon
receipt thereof by the Mortgagee; PROVIDED, HOWEVER, that (i) if the Original
Amount and interest on the Equipment Notes shall have become due and payable
pursuant to Section 4.04(b) hereof, such subrogation shall, until the Secured
Obligations shall have been paid in full, be subordinate to the rights of the
Mortgagee, the Note Holders and other holders of Secured Obligations in
respect of such payment of overdue Basic Rent, Supplemental Rent and such
interest and (ii) the Owner Trustee shall not be entitled to seek to recover
any such payment (or any payment in lieu thereof) except pursuant to the
foregoing right of subrogation.

<PAGE>

            Neither the Owner Trustee nor the Owner Participant shall have
the right to cure any Lease Event of Default or Lease Default except as
specified in this Section 4.03.

      SECTION 4.04. REMEDIES.

            (a) If an Event of Default shall have occurred and be continuing and
so long as the same shall continue unremedied, then and in every such case the
Mortgagee may, subject to the second and third paragraphs of this Section
4.04(a), 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 Event of Default is also a Lease Event of Default, any
and all of the remedies pursuant to Section 15 of the Lease [and pursuant to any
Permitted Sublease assignment]<F11> and may take possession of all or any part
of the properties covered or intended to be covered by the Lien created hereby
or pursuant hereto and may exclude the Owner Participant, the Owner Trustee and
Lessee and all persons claiming under any of them wholly or partly therefrom;
provided, that the Mortgagee shall give the Owner Trustee and the Owner
Participant twenty days' prior written notice of its intention to sell the
Aircraft, and provided, further, that in the event the Mortgagee shall have
validly terminated the Lease, the Mortgagee shall not sell or lease, or
otherwise afford the use of, the Aircraft or any portion thereof to the Lessee
or any Affiliate thereof. Unless an Event of Default not resulting from or
relating to a Lease Event of Default has occurred and is continuing, the Owner
Participant may bid at the sale and become the purchaser. Without limiting any
of the foregoing, it is understood and agreed that the Mortgagee may exercise
any right of sale of the Aircraft available to it, even though it shall not have
taken possession of the Aircraft and shall not have possession thereof at the
time of such sale.

            Anything in this Trust Indenture to the contrary notwithstanding,
the Mortgagee shall not be entitled to exercise any remedy hereunder as a
result of an Event of Default which arises solely by reason of one or more
events or circumstances which constitute a Lease Event of Default unless the
Mortgagee as security assignee of the Owner Trustee shall have exercised or
concurrently be exercising one or more of the dispossessory remedies provided
for in Section 15 of the Lease with respect to 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 Mortgagee is, and has
been, involuntarily stayed or prohibited by applicable law or court order for
a continuous period (a "Continuous Stay Period") in excess of 60 days
subsequent to an entry of an order for relief pursuant to Chapter 11 of the
Bankruptcy Code (such 60-day period, the "Section 1110 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

----------
<F11>
Insert bracketed language if the Lease provides for the assignment of a
permitted sublease.

<PAGE>

1110 Period with the approval of the relevant court to perform the Lease in
accordance with Section 1110(a)(2)(A) of the Bankruptcy Code and continues to
perform as required by Section 1110(a)(2) of the Bankruptcy Code and cures
any default (other than a default of the kind specified in Section 365(b)(2)
of the Bankruptcy Code) within the applicable time period specified in
Section 1110(a)(2)(B) of the Bankruptcy Code or (B) is an extension of the
Section 1110 Period with the consent of the Mortgagee pursuant to Section
1110(b) of the Bankruptcy Code or (C) is the consequence of the Mortgagee's
own failure to give any requisite notice or demand to any person.  In the
event that the applicability of Section 1110 of the Bankruptcy Code to the
Aircraft is being contested by Lessee in judicial proceedings, both of the
Mortgagee and the Owner Trustee shall have the right to participate in such
proceedings; provided that any such participation by the Owner Trustee shall
not affect in any way any rights or remedy of the Mortgagee hereunder.

            It is expressly understood and agreed that, subject only to the
two preceding paragraphs, the inability, described in such paragraphs, of the
Mortgagee to exercise any right or remedy under the Lease shall in no event
and under no circumstances prevent the Mortgagee from exercising any or all
of its rights, powers and remedies under this Trust Indenture, including,
without limitation, this Article IV.

            (b) If an Event of Default shall have occurred and be continuing,
then and in every such case the Mortgagee 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 delivery of written notice or notices to
the Owner Trustee and the Owner Participant, declare all the Equipment Notes to
be due and payable, whereupon the unpaid Original Amount of all Equipment Notes
then outstanding, together with accrued but unpaid interest thereon (without
Make-Whole Amount) and other amounts due thereunder, shall immediately become
due and payable without presentment, demand, protest or notice, all of which are
hereby waived; PROVIDED that if an Event of Default referred to in clause (g) of
Section 4.02 hereof shall have occurred, then and in every such case the unpaid
Original Amount 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; PROVIDED FURTHER that in the event of a
reorganization proceeding involving the Lessee instituted under Chapter 11 of
the Bankruptcy Code, if no other Lease Event of Default (including any Lease
Event of Default set forth in Section 14.3 of the Lease) and no other Event of
Default (other than the failure to pay the Original Amount of the Equipment
Notes which by such declaration shall have become payable) exists at any time
after the consummation of such proceeding, such declaration shall be
automatically rescinded without any further action on the part of any Note
Holder.

            This Section 4.04(b), however, is subject to the condition that,
if at any time after the Original 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 Original Amount of the Equipment Notes which by
such declaration shall have become payable) shall have been duly paid, and
every other Default and Event of Default with respect to any covenant or
provision of this Trust 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 Mortgagee, rescind and

<PAGE>

annul the Mortgagee's declaration (or such automatic acceleration) and its
consequences; but no such rescission or annulment shall extend to or affect
any subsequent Default or Event of Default or impair any right consequent
thereon.

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

            (c) The Note Holders shall be entitled, at any sale pursuant to
Section 15 of the Lease or this Section 4.04, to credit against any purchase
price bid at such sale by such holder all or any part of the unpaid obligations
owing to such Note Holder and secured by the Lien of this Trust Indenture (only
to the extent that such purchase price would have been paid to such Note Holder
pursuant to Article III hereof if such purchase price were paid in cash and the
foregoing provisions of this subsection (c) were not given effect).

            (d) In the event of any sale of the Trust Indenture Estate, or any
part thereof, pursuant to any judgment or decree of any court or otherwise in
connection with the enforcement of any of the terms of this Trust Indenture, the
unpaid Original Amount of all Equipment Notes then outstanding, together with
accrued interest thereon (without Make-Whole Amount), and other amounts due
thereunder, shall immediately become due and payable without presentment,
demand, protest or notice, all of which are hereby waived.

            (e) Notwithstanding anything contained herein, so long as the Pass
Through Trustee under any Pass Through Trust Agreement (or its designee) is a
Note Holder, the Mortgagee will not be authorized or empowered to acquire title
to any Mortgaged Property or take any action with respect to any Mortgaged
Property so acquired by it if such acquisition or action would cause any Trust
to fail to qualify as a "grantor trust" for federal income tax purposes.

      SECTION 4.05. RETURN OF AIRCRAFT, ETC.

            (a) If an Event of Default shall have occurred and be continuing and
the Equipment Notes have been accelerated, subject to Section 4.03 hereof and
unless the Owner Trustee or the Owner Participant shall have elected to purchase
the Equipment Notes, at the request of the Mortgagee, the Owner Trustee shall
promptly execute and deliver to the Mortgagee such instruments of title and
other documents as the Mortgagee may deem necessary or advisable to enable the
Mortgagee or an agent or representative designated by the Mortgagee, at such
time or times and place or places as the Mortgagee may specify, to obtain
possession of all or any part of the Mortgaged Property included in the Trust
Indenture Estate to which the Mortgagee shall at the time be entitled hereunder.
If the Owner Trustee shall for any reason fail to execute and deliver such
instruments and documents after such request by the Mortgagee, the Mortgagee may
(i) obtain a judgment conferring on the Mortgagee the right to immediate
possession and requiring the Owner Trustee to execute and deliver such
instruments and documents to the Mortgagee, to the entry of which judgment the
Owner Trustee hereby specifically consents to the fullest extent permitted by
Law, and (ii) pursue all or part of such Mortgaged Property wherever it may be

<PAGE>

found and, in the event that a Lease Event of Default has occurred and is
continuing, may enter any of the premises of Lessee wherever such Mortgaged
Property may be or be supposed to be and search for such Mortgaged Property and
take possession of and remove such Mortgaged Property. 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 Trust Indenture.

            (b) Upon every such taking of possession, the Mortgagee may, from
time to time, at the expense of the Mortgaged Property, make all such
expenditures for maintenance, use, operation, storage, insurance, leasing,
control, management, disposition, modifications or alterations to and of the
Mortgaged Property, as it may deem proper. In each such case, the Mortgagee
shall have the right to maintain, use, operate, store, insure, lease, control,
manage, dispose of, modify or alter the Mortgaged Property and to carry on the
business and to exercise all rights and powers of the Owner Participant and the
Owner Trustee relating to the Mortgaged Property, as the Mortgagee shall deem
best, including the right to enter into any and all such agreements with respect
to the maintenance, use, operation, storage, insurance, leasing, control,
management, disposition, modification or alteration of the Mortgaged Property or
any part thereof as the Mortgagee may determine, and the Mortgagee shall be
entitled to collect and receive directly all tolls, rents (including Rent),
revenues, issues, income, products and profits of the Mortgaged Property and
every part thereof, except Excluded Payments, without prejudice, however, to the
right of the Mortgagee under any provision of this Trust Indenture to collect
and receive all cash held by, or required to be deposited with, the Mortgagee
hereunder other than Excluded Payments. Such tolls, rents (including Rent),
revenues, issues, income, products and profits shall be applied to pay the
expenses of the maintenance, use, operation, storage, insurance, leasing,
control, management, disposition, improvement, modification or alteration of the
Mortgaged Property and of conducting the business thereof, and to make all
payments which the Mortgagee may be required or may elect to make, if any, for
taxes, assessments, insurance or other proper charges upon the Mortgaged
Property 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 which the Mortgagee
may be required or authorized to make under any provision of this Trust
Indenture, as well as just and reasonable compensation for the services of the
Mortgagee, and of all persons properly engaged and employed by the Mortgagee
with respect hereto.

      SECTION 4.06. REMEDIES CUMULATIVE.

            Each and every right, power and remedy given to the Mortgagee
specifically or otherwise in this Trust 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 Mortgagee, 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
Mortgagee 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 Lessee or to
be an acquiescence therein.

<PAGE>

      SECTION 4.07. DISCONTINUANCE OF PROCEEDINGS.

            In case the Mortgagee shall have instituted any proceeding to
enforce any right, power or remedy under this Trust 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
Mortgagee, then and in every such case the Owner Trustee, the Mortgagee and
Lessee shall, subject to any determination in such proceedings, be restored
to their former positions and rights hereunder with respect to the Mortgaged
Property, and all rights, remedies and powers of the Owner Trustee, the
Mortgagee or Lessee shall continue as if no such proceedings had been
instituted.

      SECTION 4.08. WAIVER OF PAST DEFAULTS.

            Upon written instruction from a Majority in Interest of Note
Holders, the Mortgagee shall waive any past Default hereunder and its
consequences and upon any such waiver such Default shall cease to exist and
any Event of Default arising therefrom shall be deemed to have been cured for
every purpose of this Trust Indenture, but no such waiver shall extend to any
subsequent or other Default or impair any right consequent thereon; provided,
that in the absence of written instructions from all the Note Holders, the
Mortgagee shall not waive any Default (i) in the payment of the Original
Amount, Make-Whole Amount, if any, and interest and other amounts due under
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. APPOINTMENT OF RECEIVER.

            The Mortgagee shall, as a matter of right, be entitled to the
appointment of a receiver (who may be the Mortgagee or any successor or
nominee thereof) for all or any part of the Mortgaged Property, whether such
receivership be incidental to a proposed sale of the Mortgaged Property or
the taking of possession thereof or otherwise, and the Owner Trustee hereby
consents to the appointment of such a receiver and will not oppose any such
appointment.  Any receiver appointed for all or any part of the Mortgaged
Property shall be entitled to exercise all the rights and powers of the
Mortgagee with respect to the Mortgaged Property.

      SECTION 4.10. MORTGAGEE AUTHORIZED TO EXECUTE BILLS OF SALE, ETC.

            Subject to the provisions of this Trust Indenture, the Owner
Trustee irrevocably appoints the Mortgagee the true and lawful
attorney-in-fact of the Owner Trustee (which appointment is coupled with an
interest) in its name and stead and on its behalf, for the purpose of
effectuating any sale, assignment, transfer or delivery for the enforcement
of the Lien of this Trust Indenture, whether pursuant to foreclosure or power
of sale, assignments and other instruments as may be necessary or
appropriate, with full power of substitution, the Owner Trustee hereby
ratifying and confirming all that such attorney or any substitute shall do by
virtue hereof in accordance with applicable law.  Nevertheless, if so
requested by the Mortgagee or any purchaser, the Owner Trustee shall ratify
and confirm any such sale, assignment, transfer or delivery, by executing and

<PAGE>

delivering to the Mortgagee or such purchaser all bills of sale, assignments,
releases and other proper instruments to effect such ratification and
confirmation as may be designated in any such request.

      SECTION 4.11. RIGHTS OF NOTE HOLDERS TO RECEIVE PAYMENT.

            Notwithstanding any other provision of this Trust Indenture, the
right of any Note Holder to receive payment of principal of, and premium, if
any, and interest on an Equipment Note on or after the respective due dates
expressed in such Equipment Note, or to bring suit for the enforcement of any
such payment on or after such respective dates in accordance with the terms
hereof, shall not be impaired or affected without the consent of such Note
Holder.

                                  ARTICLE V

                           DUTIES OF THE MORTGAGEE

      SECTION 5.01. NOTICE OF EVENT OF DEFAULT.

            If the Mortgagee shall have Actual Knowledge of an Event of
Default or of a Default arising from a failure to pay Rent, the Mortgagee
shall give prompt written notice thereof to the Owner Trustee, the Owner
Participant, Lessee, and each Note Holder.  Subject to the terms of Sections
2.13, 4.03, 4.04, 4.08, 5.02 and 5.03 hereof, the Mortgagee shall take such
action, or refrain from taking such action, with respect to such Event of
Default or Default (including with respect to the exercise of any rights or
remedies hereunder) as the Mortgagee shall be instructed in writing by a
Majority in Interest of Note Holders.  Subject to the provisions of Section
5.03, if the Mortgagee shall not have received instructions as above provided
within 20 days after mailing notice of such Event of Default to the Note
Holders, the Mortgagee 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 Event of Default or
Default as it shall determine advisable in the best interests of the Note
Holders; PROVIDED, HOWEVER, that the Mortgagee may not sell the Aircraft or
any Engine without the consent of a Majority in Interest of Note Holders.
For all purposes of this Trust Indenture, in the absence of Actual Knowledge
on the part of the Mortgagee, the Owner Trustee or the Owner Participant, the
Mortgagee, the Owner Trustee or the Owner Participant, as the case may be,
shall not be deemed to have knowledge of a Default or an Event of Default
(except, in the case of the Mortgagee, the failure of Lessee to pay any
installment of Basic Rent within one Business Day after the same shall become
due, if any portion of such installment was then required to be paid to the
Mortgagee, which failure shall constitute knowledge of a Default) unless
notified in writing by Lessee, the Owner Trustee, the Owner Participant or
one or more Note Holders.

      SECTION 5.02. ACTION UPON INSTRUCTIONS; CERTAIN RIGHTS AND LIMITATIONS.

            (a) Subject to the terms of Sections 2.13, 4.03, 4.04(a) and (b),
4.08, 5.01 and 5.03 hereof, upon the written instructions at any time and from
time to time of a Majority in Interest of Note Holders, the Mortgagee shall,
subject to the terms of this Section 5.02, take such of the following actions as
may be specified in such instructions: (i) give such notice or direction or
exercise such right, remedy or power hereunder as shall be specified in such

<PAGE>

instructions; (ii) give such notice or direction or exercise such right, remedy
or power under the Lease, the Participation Agreement, the Purchase Agreement,
the Purchase Agreement Assignment, or any other part of the Trust Indenture
Estate as shall be specified in such instructions; and (iii) approve as
satisfactory to the Mortgagee all matters required by the terms of the Lease to
be satisfactory to the Owner Trustee, it being understood that without the
written instructions of a Majority in Interest of Note Holders, the Mortgagee
shall not approve any such matter as satisfactory to the Mortgagee; provided,
that anything contained in this Trust Indenture, the Lease or the other
Operative Agreements to the contrary notwithstanding, but subject to the next
paragraph hereof:

            (1) the Owner Trustee or the Owner Participant, may, without the
      consent of the Mortgagee, demand, collect, sue for or otherwise obtain all
      amounts included in Excluded Payments from Lessee and seek legal or
      equitable remedies to require Lessee to maintain the insurance coverage
      referred to in Section 11 of the Lease [(or the comparable provisions of
      any assigned Permitted Sublease)]<F12> provided, that the rights referred
      to in this clause (1) shall not be deemed to include the exercise of any
      remedies provided for in Section 15 of the Lease other than the right to
      proceed by appropriate court action, either at Law or in equity, to
      enforce payment by Lessee of such amounts included in Excluded Payments or
      performance by Lessee of such insurance covenant or to recover damages for
      the breach thereof or for specific performance of any other term of the
      Lease [(or the comparable provisions of any assigned Permitted
      Sublease)]<F13>;

            (2) (A) the Mortgagee shall not, without the consent of the Owner
      Trustee, enter into, execute or deliver amendments or modifications in
      respect of any of the provisions of the Lease[, any assigned Permitted
      Sublease or any Permitted Sublease assignment]<F14>, and (B) unless a
      Mortgagee Event shall have occurred and be continuing, the Mortgagee 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 diminished or impaired thereby, (i) enter into,
      execute or deliver waivers or consents in respect of any of the provisions
      of the Lease, 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 Agreements, provided that whether
      or not any Mortgagee Event has occurred and is continuing, the Owner
      Trustee's consent shall be required with respect to any waivers or
      consents in respect of any of the provisions of Section 5, 7 or 11 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 Excluded Payment or (z) the amount or timing of any amounts payable
      by the Lessee under the Lease as originally executed (or as subsequently

----------
<F12>
Insert bracketed language if the Lease provides for the assignment of a
permitted sublease.

<F13>
Insert bracketed language if the Lease provides for the assignment of a
permitted sublease.

<F14>
Insert bracketed language if the Lease provides for the assignment of a
permitted sublease.

<PAGE>

      modified with the consent of the Owner Trustee) which, absent the
      occurrence and continuance of an Event of Default hereunder, would be
      distributable to the Owner Trustee under Article III hereof;

            (3) whether or not a Default or Event of Default under the Trust
      Indenture has occurred and is continuing, the Owner Trustee and the Owner
      Participant shall have the right, together with the Mortgagee, (i) to
      receive from Lessee [or any Permitted Sublessee]<F15> certificates and
      other documents and information which Lessee is required to give or
      furnish to the Owner Trustee or the Lessor pursuant to any Operative
      Agreement and (ii) to inspect in accordance with the Lease the Airframe
      and Engines and all Aircraft Documents;

            (4) whether or not a Default or Event of Default under the Trust
      Indenture has occurred and is continuing, the Owner Trustee shall have the
      right to adjust upwards Rent, Stipulated Loss Values and Termination
      Values as provided in Section 3.2.1 of the Lease or pursuant to a transfer
      under Section 10.1.1 of the Participation Agreement;

            (5) so long as no Mortgagee Event has occurred and is continuing,
      the Owner Trustee shall have the right, to the exclusion of the Mortgagee,
      to adjust Basic Rent, Stipulated Loss Values and Termination Values as
      provided in Section 3.2 of the Lease or to adjust downward any installment
      or amount of Basic Rent, Stipulated Loss Value or Termination Value, as
      such installments and amounts are set forth in Schedules 2, 3 and 4,
      respectively, to the Lease, to the extent of the portion of such
      installment or amount that would, under Section 3.01, 3.02 or 3.03 hereof,
      as the case may be, be distributable to the Owner Trustee or the Owner
      Participant;

            (6) whether or not a Default or Event of Default under the Trust
      Indenture has occurred and is continuing, the Owner Trustee may, without
      the consent of the Mortgagee, (i) solicit and make bids with respect to
      the Aircraft under Section 9 of the Lease in respect of a termination of
      the Lease by Lessee pursuant to Section 9 thereof, (ii) determine Fair
      Market Sales Value and Fair Market Rental Value under Section 17 of the
      Lease for all purposes except following a Mortgagee Event pursuant to
      Section 15 of the Lease, and (iii) make an election pursuant to and in
      accordance with the provisions of Sections 9.1(b), 9.2 and 9.3 of the
      Lease; and

            (7) so long as no Mortgagee Event shall have occurred and be
      continuing, all other rights of the "Lessor" under the Lease [or any
      assigned Permitted Sublease]<F16> shall be exercised by the Owner Trustee
      to the exclusion of the Mortgagee including, without limitation, the right
      to (i) exercise all rights with respect to Lessee's use and operation,
      modification or maintenance of the Aircraft and any Engine which the Lease

----------
<F15>
Insert bracketed language if the Lease provides for the assignment of a
permitted sublease.

<F16>
Insert bracketed language if the Lease provides for the assignment of a
permitted sublease.

<PAGE>

      specifically confers on the Lessor, and (ii) consent to and approve any
      assignment pursuant to Section 13 of the Lease; PROVIDED that the
      foregoing shall not (x) limit (A) any rights separately granted to the
      Mortgagee under the Operative Agreements or (B) the right of the Mortgagee
      to receive any funds to be delivered to the "Lessor" under the Lease
      (except with respect to Excluded Payments) and under the Purchase
      Agreement or (y) confer upon the Owner Trustee the right to adversely
      affect the validity or enforceability of the lien of this Indenture.

            Notwithstanding anything to the contrary contained herein
(including this Section 5.02), the Mortgagee shall have the right, to the
exclusion of the Owner Trustee and the Owner Participant, to (A) declare the
Lease to be in default under Section 15 thereof and (B) subject only to the
provisions of Sections 4.03, 4.04(a) and (b) and 2.13 hereof, exercise the
remedies set forth in such Section 15 (other than in connection with Excluded
Payments and provided that each of the Owner Trustee, Owner Participant and
Mortgagee shall independently retain the rights set forth in clause (ii) of
Section 15.1.5 of the Lease) at any time that a Lease Event of Default shall
have occurred and be continuing.  Further and for the avoidance of doubt, and
anything to the contrary contained herein (including this Section 5.02), in
no event may the Owner Trustee amend or otherwise modify the provisions of
Section 3.2.1(e) of the Lease or of the final sentence of the definition of
Stipulated Loss Value or Termination Value, in any such case, without the
prior written consent of the Mortgagee.

            The Mortgagee 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
shall be accompanied by the form of such continuation statement so to be
filed).  The Mortgagee will furnish to each Note Holder (and, during the
continuation of a Mortgagee Event, to the Owner Trustee and Owner
Participant), promptly upon receipt thereof, duplicates or copies of all
reports, notices, requests, demands, certificates and other instruments
furnished to the Mortgagee under the Lease or hereunder, including, without
limitation, a copy of each report or notice received pursuant to Section 9
and Paragraph E of Annex D of the Lease, respectively to the extent that the
same shall not have been furnished to such holder pursuant hereto or the
Lease.

            (b) If any Lease Event of Default shall have occurred and be
continuing and the Owner Trustee shall not have cured fully such Lease Event of
Default under and in accordance with Section 4.03 hereof, on request of a
Majority in Interest of Note Holders, the Mortgagee shall declare the Lease to
be in default pursuant to Section 15 thereof and exercise those remedies
specified by such Note Holders. The Mortgagee agrees to provide to the Note
Holders, the Owner Trustee and the Owner Participant concurrently with such
declaration by the Mortgagee, notice of such declaration by the Mortgagee.

      SECTION 5.03. INDEMNIFICATION.

            The Mortgagee shall not be required to take any action or refrain
from taking any action under Section 5.01 (other than the first sentence
thereof), 5.02 or Article IV hereof unless the Mortgagee shall have been
indemnified to its reasonable satisfaction against any liability, cost or
expense (including counsel fees) which may be incurred in connection
therewith pursuant to a written agreement with one or more Note Holders.  The

<PAGE>

Mortgagee agrees that it shall look solely to the Note Holders for the
satisfaction of any indemnity (except expenses for foreclosure of the type
referred to in clause "First" of Section 3.03 hereof) owed to it pursuant to
this Section 5.03.  The Mortgagee shall not be under any obligation to take
any action under this Trust Indenture or any other Operative Agreement and
nothing herein or therein shall require the Mortgagee to expend or risk its
own funds or otherwise incur the risk of any financial liability in the
performance 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 written
indemnity of any Note Holder who is a QIB, signed by an authorized officer
thereof, in favor of, delivered to and in form reasonably satisfactory to the
Mortgagee shall be accepted as reasonable assurance of adequate indemnity).
The Mortgagee 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 Trust Indenture or any other Operative
Agreement be deemed to impose a duty on the Mortgagee to take any action, if
the Mortgagee shall have been advised by counsel that such action is contrary
to the terms hereof or of the Lease or is otherwise contrary to Law.

      SECTION 5.04. NO DUTIES EXCEPT AS SPECIFIED IN TRUST INDENTURE OR
                    INSTRUCTIONS.

            The Mortgagee shall not have any duty or obligation to use,
operate, store, lease, control, manage, sell, dispose of 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 Trust Indenture or any part of the Trust Indenture Estate, except
as expressly provided by the terms of this Trust Indenture or as expressly
provided in written instructions from Note Holders as provided in this Trust
Indenture; and no implied duties or obligations shall be read into this Trust
Indenture against the Mortgagee.  The Mortgagee 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 Section 7.01 hereof),
promptly take such action as may be necessary duly to discharge all liens and
encumbrances on any part of the Trust Indenture Estate which result from
claims against it in its individual capacity not related to the ownership of
the Aircraft or the administration of the Trust Indenture Estate or any other
transaction pursuant to this Trust Indenture or any document included in the
Trust Indenture Estate.

      SECTION 5.05. NO ACTION EXCEPT UNDER LEASE, TRUST INDENTURE OR
                    INSTRUCTIONS.

            The Owner Trustee and the Mortgagee agree that they will not use,
operate, store, lease, control, manage, sell, dispose of or otherwise deal
with the Aircraft or any other part of the Trust Indenture Estate except (i)
as required by the terms of the Lease or (ii) in accordance with the powers
granted to, or the authority conferred upon, the Owner Trustee and the
Mortgagee pursuant to this Trust Indenture and in accordance with the express
terms hereof.

      SECTION 5.06. REPLACEMENT AIRFRAMES AND REPLACEMENT ENGINES.

            At any time an Airframe or Engine is to be replaced under or
pursuant to Section 10 of the Lease by a Replacement Airframe or Replacement
Engine, if no Lease Event of Default is continuing, the Owner Trustee shall
direct the Mortgagee to execute and deliver to the Owner Trustee an

<PAGE>

appropriate instrument releasing such Airframe and/or Engine as appropriate
from the Lien of this Trust Indenture and the Mortgagee shall execute and
deliver such instrument as aforesaid, but only upon compliance by Lessee with
the applicable provisions of Section 10 of the Lease.

      SECTION 5.07. INDENTURE SUPPLEMENTS FOR REPLACEMENTS.

            If a Replacement Airframe or Replacement Engine is being
substituted as contemplated by Section 10 of the Lease, the Owner Trustee and
the Mortgagee agree for the benefit of the Note Holders and Lessee, subject
to fulfillment of the conditions precedent and compliance by Lessee with its
obligations set forth in Section 10 of the Lease and the requirements of
Section 5.06 hereof with respect to such Replacement Airframe or Replacement
Engine, to execute and deliver a Lease Supplement and a Trust Indenture
Supplement, as applicable, as contemplated by Section 10 of the Lease.

      SECTION 5.08. EFFECT OF REPLACEMENT.

            In the event of the substitution of an Airframe or of a
Replacement Engine pursuant to Section 10 of the Lease, all provisions of
this Trust Indenture relating to the Airframe or Engine or Engines being
replaced shall be applicable to such Replacement Airframe or Replacement
Engine or Engines with the same force and effect as if such Replacement
Airframe or Replacement Engine or Engines were the same airframe or engine or
engines, as the case may be, as the Airframe or Engine or Engines being
replaced but for the Event of Loss with respect to the Airframe or Engine or
Engines being replaced.

      SECTION 5.09. INVESTMENT OF AMOUNTS HELD BY MORTGAGEE.

            Any amounts held by the Mortgagee as assignee of the Owner
Trustee's rights to hold monies for security pursuant to Section 4.4 of the
Lease shall be held in accordance with the terms of such Section and the
Mortgagee agrees, for the benefit of Lessee, to perform the duties of the
Owner Trustee under such Section.  Any amounts held by the Mortgagee pursuant
to the proviso to the first sentence of Section 3.01, pursuant to Section
3.02, or pursuant to any provision of any other Operative Agreement providing
for amounts to be held by the Mortgagee which are not distributed pursuant to
the other provisions of Article III hereof shall be invested by the Mortgagee
from time to time in Cash Equivalents as directed by the Owner Trustee so
long as the Mortgagee may acquire the same using its best efforts.  All Cash
Equivalents held by the Mortgagee pursuant to Section 4.4 of the Lease or
this Section 5.09 shall either be (a) registered in the name of, payable to
the order of, or specially indorsed to, the Mortgagee, or (b) held in an
Eligible Account.  Unless otherwise expressly provided in this Trust
Indenture, any income realized as a result of any such investment, net of the
Mortgagee's reasonable fees and expenses in making such investment, shall be
held and applied by the Mortgagee 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 Mortgagee shall not be liable for any loss resulting from any
investment required to be made by it under this Trust 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 Mortgagee without

<PAGE>

instructions whenever such sale is necessary to make a distribution required
by this Trust Indenture.

                                  ARTICLE VI

                     THE OWNER TRUSTEE AND THE MORTGAGEE

      SECTION 6.01. ACCEPTANCE OF TRUSTS AND DUTIES.

            The Mortgagee accepts the duties hereby created and applicable to
it and agrees to perform the same but only upon the terms of this Trust
Indenture and agrees to receive and disburse all monies constituting part of
the Trust Indenture Estate in accordance with the terms hereof.  The Owner
Trustee, in its individual capacity, and the Mortgagee, in its individual
capacity, shall not be answerable or accountable under any circumstances,
except (i) for their own willful misconduct or gross negligence (other than
for the handling of funds, for which the standard of accountability shall be
willful misconduct or negligence), (ii) in the case of the Mortgagee, as
provided in the fourth sentence of Section 2.04(a) hereof and the last
sentence of Section 5.04 hereof, and (iii) for liabilities that may result,
in the case of the Owner Trustee, from the inaccuracy of any representation
or warranty of the Owner Trustee expressly made in its individual capacity in
the Participation Agreement or in Section 4.01(b) or 6.03 hereof (or in any
certificate furnished to the Mortgagee or any Note Holder in connection with
the transactions contemplated by the Operative Agreements) or, in the case of
the Mortgagee (in its individual capacity), from the inaccuracy of any
representation or warranty of the Mortgagee (in its individual capacity) in
the Participation Agreement or expressly made hereunder.  Neither the Owner
Trustee nor the Mortgagee shall be liable for any action or inaction of the
other or of the Owner Participant.

      SECTION 6.02. ABSENCE OF DUTIES.

            In the case of the Mortgagee, except in accordance with written
instructions furnished pursuant to Section 5.01 or 5.02 hereof, and except as
provided in, and without limiting the generality of, Sections 5.03, 5.04 and
6.08 hereof and, in the case of the Owner Trustee, except as provided in
Section 4.01(b) hereof, the Owner Trustee and the Mortgagee shall have no
duty (i) to see to any registration of the Aircraft or any recording or
filing of the Lease or of this Trust 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 or to effect or maintain any such
insurance, whether or not Lessee shall be in default with respect thereto,
(iii) to see to the payment or discharge of any lien or encumbrance 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 from Lessee, or (v) to inspect the Aircraft at any time or
ascertain or inquire as to the performance or observance of any of Lessee's
covenants under the Lease [or any of the Permitted Sublessee's covenants
under any assigned Permitted Sublease]<F17> with respect to the Aircraft.  The

----------
<F17>
Insert bracketed language if the Lease provides for the assignment of a
permitted sublease.

<PAGE>

Owner Participant shall not have any duty or responsibility hereunder,
including, without limitation, any of the duties mentioned in clauses (i)
through (v) above; provided, that nothing contained in this sentence shall
limit any obligations of the Owner Participant under the Participation
Agreement or relieve the Owner Participant from any restriction under Section
4.03 hereof.

      SECTION 6.03. NO REPRESENTATIONS OR WARRANTIES AS TO AIRCRAFT OR
                    DOCUMENTS.

            NEITHER THE MORTGAGEE IN ITS INDIVIDUAL OR TRUST CAPACITY NOR THE
OWNER TRUSTEE IN ITS INDIVIDUAL CAPACITY OR AS OWNER TRUSTEE UNDER THE TRUST
AGREEMENT, MAKES OR SHALL BE DEEMED TO HAVE MADE AND EACH HEREBY EXPRESSLY
DISCLAIMS ANY REPRESENTATION OR WARRANTY, EXPRESS OR IMPLIED, AS TO THE
TITLE, AIRWORTHINESS, VALUE, COMPLIANCE WITH SPECIFICATIONS, CONDITION,
DESIGN, QUALITY, DURABILITY, OPERATION, MERCHANTABILITY OR FITNESS FOR USE
FOR A PARTICULAR PURPOSE OF THE AIRCRAFT OR ANY ENGINE, 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 WHATSOEVER, except the Owner Trustee in its individual capacity
warrants that (i) the Owner Trustee has received on the Delivery Date
whatever title was conveyed to it, and (ii) the Aircraft is free and clear of
Lessor Liens attributable to the Owner Trustee in its individual capacity.
Neither the Owner Trustee, in its individual capacity or as Owner Trustee
under the Trust Agreement, nor the Mortgagee, in its individual or trust
capacities, makes or shall be deemed to have made any representation or
warranty as to the validity, legality or enforceability of this Trust
Indenture, the Trust Agreement, the Participation Agreement, the Equipment
Notes, the Lease, the Purchase Agreement or the Purchase Agreement Assignment
with the Consent and Agreement and the Engine Consent and Agreement attached
thereto, or as to the correctness of any statement contained in any thereof,
except for the representations and warranties of the Owner Trustee made in
its individual capacity and the representations and warranties of the
Mortgagee in its individual capacity, in each case expressly made in this
Trust Indenture or in the Participation Agreement.  The Loan Participants,
the Note Holders and the Owner Participant make no representation or warranty
hereunder whatsoever.

      SECTION 6.04. NO SEGREGATION OF MONIES; NO INTEREST.

            Any monies paid to or retained by the Mortgagee pursuant to any
provision hereof and not then required to be distributed to the Note Holders,
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 or Section 4.4
of the Lease and Section 5.09 hereof, and may be deposited under such general
conditions as may be prescribed by Law, and the Mortgagee shall not be liable
for any interest thereon (except that the Mortgagee shall invest all monies
held as directed by Lessee so long as no Lease Event of Default or Lease
Default has occurred and is continuing (or in the absence of such direction,
by the Majority In Interest of Note Holders) in Cash Equivalents; PROVIDED,
HOWEVER, that any payments received, or applied hereunder, by the Mortgagee

<PAGE>

shall be accounted for by the Mortgagee so that any portion thereof paid or
applied pursuant hereto shall be identifiable as to the source thereof.

      SECTION 6.05. RELIANCE; AGREEMENTS; ADVICE OF COUNSEL.

            Neither the Owner Trustee nor the Mortgagee 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 Mortgagee
may accept a copy of a resolution of the Board of Directors (or Executive
Committee thereof) of any party to the Participation 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 Original 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 Mortgagee.
As to any fact or matter relating to Lessee the manner of ascertainment of
which is not specifically described herein, the Owner Trustee and the
Mortgagee may for all purposes hereof rely on a certificate, signed by a duly
authorized officer of Lessee, as to such fact or matter, and such certificate
shall constitute full protection to the Owner Trustee and the Mortgagee for
any action taken or omitted to be taken by them in good faith in reliance
thereon.  The Mortgagee shall assume, and shall be fully protected in
assuming, that the Owner Trustee is authorized by the Trust Agreement to
enter into this Trust 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 Mortgagee
each may execute any of the trusts or powers hereof and perform its powers
and duties hereunder directly or through agents or attorneys and may, at the
expense of the Trust Indenture Estate, advise with counsel, accountants and
other skilled persons to be selected and retained by it, and the Owner
Trustee and the Mortgagee 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 as herein and
in the Trust Agreement provided, and not in its individual capacity, except
as otherwise expressly provided herein, in the Trust Agreement and in the
Participation Agreement.

      SECTION 6.07. COMPENSATION.

            The Mortgagee shall be entitled to reasonable compensation,
including expenses and disbursements (including the reasonable fees and
expenses of counsel), for all services rendered hereunder and shall, on and
subsequent to an Event of Default hereunder, have a priority claim on the
Trust Indenture Estate for the payment of such compensation, to the extent
that such compensation shall not be paid by Lessee, and shall have the right,
on and subsequent to an Event of Default hereunder, to use or apply any
monies held by it hereunder in the Trust Indenture Estate toward such
payments.  The Mortgagee agrees that it shall have no right against the Loan

<PAGE>

Participants, the Note Holders, the Owner Trustee or the Owner Participant
for any fee as compensation for its services as trustee under this Trust
Indenture.

      SECTION 6.08. INSTRUCTIONS FROM NOTE HOLDERS.

            In the administration of the trusts created hereunder, the
Mortgagee shall have the right to seek instructions from a Majority in
Interest of Note Holders should any provision of this Trust Indenture appear
to conflict with any other provision herein or should the Mortgagee's duties
or obligations hereunder be unclear, and the Mortgagee shall incur no
liability in refraining from acting until it receives such instructions.  The
Mortgagee shall be fully protected for acting in accordance with any
instructions received under this Section 6.08.

                                 ARTICLE VII

                INDEMNIFICATION OF MORTGAGEE BY OWNER TRUSTEE

      SECTION 7.01. SCOPE OF INDEMNIFICATION.

            The Owner Trustee, not in its individual capacity, but solely as
Owner Trustee, hereby agrees, whether or not any of the transactions
contemplated hereby shall be consummated, except as to matters covered by any
indemnity furnished as contemplated by Section 5.03 hereof and except as
otherwise provided in Section 2.03 or 2.04(b) hereof, to assume liability
for, and does hereby indemnify, protect, save and keep harmless the Mortgagee
(in its individual and trust capacities), and its successors, assigns, agents
and servants, from and against any and all liabilities, obligations, losses,
damages, penalties, taxes (excluding any taxes payable by the Mortgagee on or
measured by any compensation received by the Mortgagee for its services under
this Trust Indenture), claims, actions, suits, costs, expenses or
disbursements (including legal fees and expenses) of any kind and nature
whatsoever, which may be imposed on, incurred by or asserted against the
Mortgagee (whether or not also indemnified against by any other person under
any other document) in any way relating to or arising out of this Trust
Indenture or any other Operative Agreement to which it is a party 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, non-acceptance,
rejection, ownership, delivery, lease, possession, use, operation, condition,
sale, return or other disposition of the Aircraft or any Engine (including,
without limitation, latent or 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 Mortgagee hereunder except only in
the case of willful misconduct or gross negligence (or negligence in the case
of handling funds) of the Mortgagee in the performance of its duties
hereunder or resulting from the inaccuracy of any representation or warranty
of the Mortgagee (in its individual capacity) referred to in Section 6.03
hereof, or as provided in Section 6.01 hereof or in the last sentence of
Section 5.04 hereof, or as otherwise excluded by the terms of Section 9.1 or
9.3 of the Participation Agreement from Lessee's indemnities under such
Sections.  In addition, if necessary, the Mortgagee 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 Lessee or others, but without releasing any of them from
their respective agreements of reimbursement; and to secure the same the

<PAGE>

Mortgagee shall have a prior Lien on the Trust Indenture Estate.  Without
limiting the foregoing, the Mortgagee agrees that, prior to seeking
indemnification from the Trust Indenture Estate, it will demand, and
diligently pursue in good faith (but with no duty to exhaust all legal
remedies therefor), indemnification available to the Mortgagee from Lessee
under the Lease or the Participation Agreement.

                                  ARTICLE VIII

                         SUCCESSOR 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 including upon any merger,
conversion, consolidation or sale of substantially all of the corporate trust
business of the Owner Trustee pursuant to the Trust Agreement, the successor
Owner Trustee shall give prompt written notice thereof to the Mortgagee,
Lessee and the Note Holders.

      SECTION 8.02. RESIGNATION OF MORTGAGEE; APPOINTMENT OF SUCCESSOR.

            (a) The Mortgagee or any successor thereto may resign at any time
without cause by giving at least 30 days' prior written notice to Lessee, the
Owner Trustee, the Owner Participant and each Note Holder, such resignation to
be effective upon the acceptance of the trusteeship by a successor Mortgagee. In
addition, a Majority in Interest of Note Holders may at any time (but only with
the consent of the Lessee, which consent shall not be unreasonably withheld,
except that such consent shall not be necessary if a Lease Event of Default is
continuing) remove the Mortgagee without cause by an instrument in writing
delivered to the Owner Trustee, Lessee, the Owner Participant and the Mortgagee,
and the Mortgagee shall promptly notify each Note Holder thereof in writing,
such removal to be effective upon the acceptance of the trusteeship by a
successor Mortgagee. In the case of the resignation or removal of the Mortgagee,
a Majority in Interest of Note Holders may appoint a successor Mortgagee by an
instrument signed by such holders, which successor, so long as no Lease Event of
Default shall have occurred and be continuing, shall be subject to Lessee's
reasonable approval. If a successor Mortgagee shall not have been appointed
within 30 days after such notice of resignation or removal, the Mortgagee, the
Owner Trustee, the Owner Participant or any Note Holder may apply to any court
of competent jurisdiction to appoint a successor Mortgagee to act until such
time, if any, as a successor shall have been appointed as above provided. The
successor Mortgagee so appointed by such court shall immediately and without
further act be superseded by any successor Mortgagee appointed as above
provided.

            (b) Any successor Mortgagee, however appointed, shall execute and
deliver to the Owner Trustee, the predecessor Mortgagee and the Lessee an
instrument accepting such appointment and assuming the obligations of the
Mortgagee under the Participation Agreement arising from and after the time of
such appointment, and thereupon such successor Mortgagee, without further act,
shall become vested with all the estates, properties, rights, powers and duties
of the predecessor Mortgagee hereunder in the trust hereunder applicable to it
with like effect as if originally named the Mortgagee herein; but nevertheless
upon the written request of such successor Mortgagee, such predecessor Mortgagee

<PAGE>

shall execute and deliver an instrument transferring to such successor
Mortgagee, upon the trusts herein expressed applicable to it, all the estates,
properties, rights and powers of such predecessor Mortgagee, and such
predecessor Mortgagee shall duly assign, transfer, deliver and pay over to such
successor Mortgagee all monies or other property then held by such predecessor
Mortgagee hereunder.

            (c) Any successor Mortgagee, however appointed, shall be a bank or
trust company having its principal place of business in the Borough of
Manhattan, City and State of New York; Chicago, Illinois; Hartford, Connecticut;
Wilmington, Delaware; or Boston, Massachusetts and having (or whose obligations
under the Operative Agreements are guaranteed by an affiliated entity having) a
combined capital and surplus of at least $100,000,000, if there be such an
institution willing, able and legally qualified to perform the duties of the
Mortgagee hereunder upon reasonable or customary terms.

            (d) Any corporation into which the Mortgagee 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 Mortgagee shall be a
party, or any corporation to which substantially all the corporate trust
business of the Mortgagee may be transferred, shall, subject to the terms of
paragraph (c) of this Section 8.02, be a successor Mortgagee and the Mortgagee
under this Trust Indenture without further act.

      SECTION 8.03. APPOINTMENT OF ADDITIONAL AND SEPARATE TRUSTEES.

            (a) Whenever (i) the Mortgagee shall deem it necessary or desirable
in order to conform to any Law of any jurisdiction in which all or any part of
the Trust Indenture Estate shall be situated or to make any claim or bring any
suit with respect to or in connection with the Trust Indenture Estate, this
Trust Indenture, any other Indenture Agreement, the Equipment Notes or any of
the transactions contemplated by the Participation Agreement, (ii) the Mortgagee
shall be advised by counsel satisfactory to it that it is so necessary or
prudent in the interests of the Note Holders (and the Mortgagee shall so advise
the Owner Trustee and Lessee), or (iii) the Mortgagee shall have been requested
to do so by a Majority in Interest of Note Holders, then in any such case, the
Mortgagee and, upon the written request of the Mortgagee, the Owner Trustee,
shall execute and deliver an indenture supplemental hereto and such other
instruments as may from time to time be necessary or advisable either (1) to
constitute one or more bank or trust companies or one or more persons approved
by the Mortgagee, either to act jointly with the Mortgagee as additional trustee
or trustees of all or any part of the Trust Indenture Estate, or to act as
separate trustee or trustees of all or any part of the Trust Indenture Estate,
in each case with such rights, powers, duties and obligations consistent with
this Trust Indenture as may be provided in such supplemental indenture or other
instruments as the Mortgagee or a Majority in Interest of Note Holders may deem
necessary or advisable, or (2) to clarify, add to or subtract from the rights,
powers, duties and obligations theretofore granted any such additional or
separate trustee, subject in each case to the remaining provisions of this
Section 8.03. If the Owner Trustee shall not have taken any action requested of
it under this Section 8.03(a) that is permitted or required by its terms within
15 days after the receipt of a written request from the Mortgagee so to do, or
if an Event of Default shall have occurred and be continuing, the Mortgagee may
act under the foregoing provisions of this Section 8.03(a) without the
concurrence of the Owner Trustee, and the Owner Trustee hereby irrevocably

<PAGE>

appoints (which appointment is coupled with an interest) the Mortgagee, its
agent and attorney-in-fact to act for it under the foregoing provisions of this
Section 8.03(a) in either of such contingencies. The Mortgagee may, in such
capacity, execute, deliver and perform any such supplemental indenture, or any
such instrument, as may be required for the appointment of any such additional
or separate trustee or for the clarification of, addition to or subtraction from
the rights, powers, duties or obligations theretofore granted to any such
additional or separate trustee. In case any additional or separate trustee
appointed under this Section 8.03(a) shall die, become incapable of acting,
resign or be moved, all the assets, property, rights, powers, trusts, duties and
obligations of such additional or separate trustee shall revert to the Mortgagee
until a successor additional or separate trustee is appointed as provided in
this Section 8.03(a).

            (b) No additional or separate trustee shall be entitled to exercise
any of the rights, powers, duties and obligations conferred upon the Mortgagee
in respect of the custody, investment and payment of monies and all monies
received by any such additional or separate trustee from or constituting part of
the Trust Indenture Estate or otherwise payable under any Operative Agreement to
the Mortgagee shall be promptly paid over by it to the Mortgagee. All other
rights, powers, duties and obligations conferred or imposed upon any additional
or separate trustee shall be exercised or performed by the Mortgagee and such
additional or separate trustee jointly except to the extent that applicable Law
of any jurisdiction in which any particular act is to be performed renders the
Mortgagee incompetent or unqualified to perform such act, in which event such
rights, powers, duties and obligations (including the holding of title to all or
part of the Trust Indenture Estate in any such jurisdiction) shall be exercised
and performed by such additional or separate trustee. No additional or separate
trustee shall take any discretionary action except on the instructions of the
Mortgagee or a Majority in Interest of Note Holders. No trustee hereunder shall
be personally liable by reason of any act or omission of any other trustee
hereunder, except that the Mortgagee shall be liable for the consequences of its
lack of reasonable care in selecting, and the Mortgagee's own actions in acting
with, any additional or separate trustee. Each additional or separate trustee
appointed pursuant to this Section 8.03 shall be subject to, and shall have the
benefit of Articles IV through VIII and Article X hereof insofar as they apply
to the Mortgagee. The powers of any additional or separate trustee appointed
pursuant to this Section 8.03 shall not in any case exceed those of the
Mortgagee hereunder.

            (c) If at any time the Trustee shall deem it no longer necessary or
in order to conform to any such Law or take any such action or shall be advised
by such counsel that it is no longer so necessary or desirable in the interest
of the Note Holders, or in the event that the Mortgagee shall have been
requested to do so in writing by a Majority in Interest of Note Holders, the
Mortgagee and, upon the written request of the Mortgagee, the Owner Trustee,
shall execute and deliver an indenture supplemental hereto and all other
instruments and agreements necessary or proper to remove any additional or
separate trustee. The Mortgagee may act on behalf of the Owner Trustee under
this Section 8.03(c) when and to the extent it could so act under Section
8.03(a) hereof.

<PAGE>

                                   ARTICLE IX

      SUPPLEMENTS AND AMENDMENTS TO THIS TRUST INDENTUREAND OTHER DOCUMENTS

            SECTION 9.01. INSTRUCTIONS OF MAJORITY; LIMITATIONS.

            (a) Except as provided in Section 5.02 hereof, the Owner Trustee
agrees it shall not enter into any amendment of or supplement to the Lease, the
Purchase Agreement, the Purchase Agreement Assignment, the Consent and Agreement
or the Engine Consent and Agreement, or execute and deliver any written waiver
or modification of, or consent under, the terms of the Lease, the Purchase
Agreement, the Purchase Agreement Assignment, the Consent and Agreement or the
Engine Consent and Agreement, unless such supplement, amendment, waiver,
modification or consent is consented to in writing by the Mortgagee and a
Majority in Interest of Note Holders. Anything to the contrary contained herein
notwithstanding, without the necessity of the consent of any of the Note Holders
or the Mortgagee, (i) any Excluded Payments payable to the Owner Participant may
be modified, amended, changed or waived in such manner as shall be agreed to by
the Owner Participant and Lessee and (ii) the Owner Trustee and Lessee may enter
into amendments of or additions to the Lease to modify Section 5 (except to the
extent that such amendment would affect the rights or exercise of remedies under
Section 15 of the Lease) or Section 17 of the Lease so long as such amendments,
modifications and changes do not and would not affect the time of, or reduce the
amount of, Rent payments (except to the extent expressly permitted by Section
5.02 hereof) until after the payment in full of all Secured Obligations or
otherwise adversely affect the Note Holders.

            (b) Without limiting the provisions of Section 9.01 hereof, the
Mortgagee agrees with the Note Holders that it shall not enter into any
amendment, waiver or modification of, supplement or consent to this Trust
Indenture, the Lease, the Purchase Agreement, the Purchase Agreement Assignment,
the Consent and Agreement, the Engine Consent and Agreement or the Participation
Agreement, 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, but upon the written request
of a Majority in Interest of Note Holders, the Mortgagee 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 Airframe Manufacturer or the Engine Manufacturer;
PROVIDED, HOWEVER, that, without the consent of each holder of an affected
Equipment Note then outstanding and of the Liquidity Provider, no such amendment
of or supplement to this Trust Indenture, the Lease, the Purchase Agreement, the
Purchase Agreement Assignment, the Consent and Agreement, the Engine Consent and
Agreement or the Participation Agreement 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 Article II or III or Section 4.02, 4.04(c), 4.04(d),
5.02 or 5.06 hereof, Section 13.3, 14 (except to add an Event of Default) or 16
of the Lease, Section 15.1 of the Participation Agreement, the definitions of
"Event of Default," "Default," "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,

<PAGE>

(ii) reduce the amount, or change the time of payment or method of calculation
of any amount, of Original 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 Lessee, (iii)
reduce, modify or amend any indemnities in favor of the Owner Trustee, the
Mortgagee or the Note Holders (except that the Owner Trustee (in its individual
capacity) or the Mortgagee, as the case may be, may consent to any waiver or
reduction of an indemnity payable to it) or the Pass Through Indemnitees, (iv)
consent to any change in the Trust Indenture or the Lease which would permit
redemption of Equipment Notes earlier than permitted under Section 2.10 or 2.11
hereof or the purchase or exchange of the Equipment Notes other than as
permitted by Section 2.13 hereof, (v) except as contemplated by the Lease or the
Participation Agreement, reduce the amount or extend the time of payment of
Basic Rent, Stipulated Loss Value, or Termination Value for the Aircraft in each
case as set forth in the Lease, or modify, amend or supplement the Lease or
consent to any assignment of the Lease, in either case releasing Lessee from its
obligations in respect of the payment of Basic Rent, Stipulated Loss Value or
Termination Value for the Aircraft or altering the absolute and unconditional
character of the obligations of Lessee to pay Rent as set forth in Sections 3
and 16 of the Lease 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 Trust 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 hereof, the Owner Trustee and the
Mortgagee 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 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 Mortgagee 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; (iv) to correct or amplify the description of any property at any
time subject to the Lien of this Trust Indenture or better to assure, convey and
confirm unto the Mortgagee any property subject or required to be subject to the
Lien of this Trust 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 power 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.

      SECTION 9.02. TRUSTEES PROTECTED.

            If, in the opinion of the institution acting as Owner Trustee
under the Trust Agreement or the institution acting as Mortgagee hereunder,

<PAGE>

any document required to be executed by it pursuant to the terms of Section
9.01 hereof affects any right, duty, immunity or indemnity with respect to
such institution under this Trust Indenture or the Lease, such institution
may in its discretion decline to execute such document.

      SECTION 9.03. DOCUMENTS MAILED TO NOTE HOLDERS.

            Promptly after the execution by the Owner Trustee or the
Mortgagee of any document entered into pursuant to Section 9.01 hereof, the
Mortgagee shall mail, by first class mail, postage prepaid, a copy thereof to
Lessee and to each Note Holder at its address last set forth in the Equipment
Note Register, but the failure of the Mortgagee to mail such copies shall not
impair or affect the validity of such document.

      SECTION 9.04. NO REQUEST NECESSARY FOR LEASE SUPPLEMENT OR TRUST INDENTURE
                    SUPPLEMENT.

            No written request or consent of the Mortgagee, the Note Holders
or the Owner Participant pursuant to Section 9.01 hereof shall be required to
enable the Owner Trustee to enter into any Lease Supplement specifically
required by the terms of the Lease or to execute and deliver a Trust
Indenture Supplement specifically required by the terms hereof.

                                    ARTICLE X

                                  MISCELLANEOUS

      SECTION 10.01. TERMINATION OF TRUST INDENTURE.

            Upon (or at any time after) payment in full of the Original
Amount of, Make-Whole Amount, if any, and interest on and all other amounts
due under all Equipment Notes and provided that there shall then be no other
Secured Obligations due to the Note Holders, the Mortgagee and other holders
of Secured Obligations hereunder or under the Participation Agreement or any
other Operative Agreement, the Owner Trustee shall direct the Mortgagee to
execute and deliver to or as directed in writing by the Owner Trustee an
appropriate instrument releasing the Aircraft and the Engines from the Lien
of this Trust Indenture and releasing the Lease, the Purchase Agreement, the
Purchase Agreement Assignment with the Consent and Agreement and the Engine
Consent and Agreement attached thereto from the assignment and pledge thereof
hereunder and the Mortgagee shall execute and deliver such instrument as
aforesaid and give written notice thereof to Lessee; PROVIDED, HOWEVER, that
this Trust Indenture and the trusts created hereby shall earlier terminate
and this Trust Indenture shall be of no further force or effect upon any sale
or other final disposition by the Mortgagee of all property constituting part
of the Trust Indenture Estate and the final distribution by the Mortgagee of
all monies or other property or proceeds constituting part of the Trust
Indenture Estate in accordance with the terms hereof.  Except as aforesaid
otherwise provided, this Trust Indenture and the trusts created hereby shall
continue in full force and effect in accordance with the terms hereof.

<PAGE>

      SECTION 10.02. NO LEGAL TITLE TO TRUST INDENTURE ESTATE IN NOTE HOLDERS.

            No holder of an Equipment Note 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 right, title and interest of any
Note Holder in and to the Trust Indenture Estate or hereunder shall operate
to terminate this Trust Indenture or entitle such holder or any successor or
transferee of such holder to an accounting or to the transfer to it of any
legal title to any part of the Trust Indenture Estate.

      SECTION 10.03. SALE OF AIRCRAFT BY MORTGAGEE IS BINDING.

            Any sale or other conveyance of the Trust Indenture Estate, or
any part thereof (including any part thereof or interest therein), by the
Mortgagee made pursuant to the terms of this Trust Indenture shall bind the
Note Holders and shall be effective to transfer or convey all right, title
and interest of the Trustee, the Owner Trustee, the Owner Participant and
such holders in and to such Trust Indenture Estate or part thereof.  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 Mortgagee.

      SECTION 10.04. TRUST INDENTURE FOR BENEFIT OF OWNER TRUSTEE, MORTGAGEE,
                     OWNER PARTICIPANT, NOTE HOLDERS AND OTHER HOLDERS OF
                     SECURED OBLIGATIONS.

            Nothing in this Trust Indenture, whether express or implied, shall
be construed to give any person other than the Owner Trustee, the Mortgagee, the
Owner Participant, the Note Holders and other holders of Secured Obligations,
any legal or equitable right, remedy or claim under or in respect of this Trust
Indenture.

      SECTION 10.05. NOTICES.

            Unless otherwise expressly specified or permitted by the terms
hereof, all notices, requests, demands, authorizations, directions, consents,
waivers or documents provided or permitted by this Trust Indenture to be
made, given, furnished or filed shall be in writing, personally delivered or
mailed by certified mail, postage prepaid, or by facsimile or confirmed
telex, and (i) if to the Owner Trustee, addressed to it at 79 South Main
Street, 3rd Floor, Salt Lake City, Utah 84111 with a copy to the Owner
Participant addressed as provided in clause (iii) below, (ii) if to
Mortgagee, addressed to it at its office at Rodney Square North, 1100 North
Market Street, Wilmington, Delaware 19890, Attention: Corporate Trust
Administration, facsimile number (302) 651-8882, (iii) if to any Participant,
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 Mortgagee,
or, until an address is so furnished, addressed to the address of such party
(if any) set forth on Schedule 1 to the Participation Agreement or in the
Equipment Note Register.  Whenever any notice in writing is required to be
given by the Owner Trustee, any Participant or the Mortgagee or any Note
Holder to any of the other of them, such notice shall be deemed given and
such requirement satisfied when such notice is received, or if such notice is
mailed by certified mail, postage prepaid, three Business Days after being

<PAGE>

mailed, addressed as provided above.  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 Trust Indenture.

      SECTION 10.06. SEVERABILITY.

            Any provision of this Trust 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. Any such prohibition or unenforceability in any
particular jurisdiction shall not invalidate or render unenforceable such
provision in any other jurisdiction.

      SECTION 10.07. NO ORAL MODIFICATION OR CONTINUING WAIVERS.

            No term or provision of this Trust Indenture or the Equipment Notes
may be changed, waived, discharged or terminated orally, but only by an
instrument in writing signed by the Owner Trustee and the Mortgagee, in
compliance with Section 9.01 hereof. 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 10.08. 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 permitted
successors and 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 holder. This Trust 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 Trust Indenture to the Trust
Agreement shall mean the Trust Agreement as amended and supplemented from time
to time to the extent permitted hereby, thereby and by the Participation
Agreement. Each Note Holder by its acceptance of an Equipment Note agrees to be
bound by this Trust Indenture and all provisions of the Participation Agreement
applicable to a Loan Participant or a Note Holder.

      SECTION 10.09. HEADINGS.

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

      SECTION 10.10. NORMAL COMMERCIAL RELATIONS.

            Anything contained in this Trust Indenture to the contrary
notwithstanding, Owner Trustee, Mortgagee, any Participant or any bank or other
Affiliate of such Participant may conduct any banking or other financial

<PAGE>

transactions, and have banking or other commercial relationships, with Lessee
[or any Permitted Sublessee]<F18>, fully to the same extent as if this Trust
Indenture were not in effect, including without limitation the making of loans
or other extensions of credit to Lessee for any purpose whatsoever, whether
related to any of the transactions contemplated hereby or otherwise.

      SECTION 10.11. GOVERNING LAW; COUNTERPART FORM.

            THIS TRUST INDENTURE SHALL IN ALL RESPECTS BE GOVERNED BY, AND
CONSTRUED IN ACCORDANCE WITH, THE INTERNAL LAWS OF THE STATE OF NEW YORK,
INCLUDING ALL MATTERS OF CONSTRUCTION, VALIDITY AND PERFORMANCE. THIS TRUST
INDENTURE IS BEING DELIVERED IN THE STATE OF NEW YORK. This Trust Indenture may
be executed by the parties hereto in separate counterparts (or upon separate
signature pages bound together into one or more 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 10.12. VOTING BY NOTE HOLDERS.

            All votes of the Note Holders shall be governed by a vote of a
Majority in Interest of Note Holders, except as otherwise provided herein.

      SECTION 10.13. BANKRUPTCY.

            It is the intention of the parties that the Owner Trustee, as
lessor under the Lease (and the Mortgagee as assignee of the Owner Trustee
hereunder), shall be entitled to the benefits of Section 1110 with respect to
the right to take possession of the Aircraft, Airframe, Engines and Parts and
to enforce any of its other rights or remedies 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 any other pertinent Operative
Agreement, each such party agrees that a construction which would preserve
such benefits shall control over any construction which would not preserve
such benefits.

----------
<F18>
Insert bracketed language if the Lease provides for the assignment of a
permitted sublease.

<PAGE>

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

                                          FIRST SECURITY BANK, NATIONAL
                                          ASSOCIATION,
                                              not in its individual capacity,
                                              except as expressly provided
                                              herein, but solely as Owner
                                              Trustee, as Owner Trustee

                                          By:
                                             -------------------------------
                                             Name:
                                             Title:

                                          WILMINGTON TRUST COMPANY, as
                                              Mortgagee

                                          By:
                                             -------------------------------
                                             Name:
                                             Title:

<PAGE>

                                                                       EXHIBIT A
                                           TO TRUST INDENTURE AND MORTGAGE [___]

                TRUST INDENTURE AND MORTGAGE [___] SUPPLEMENT

            This TRUST INDENTURE AND MORTGAGE [___] SUPPLEMENT NO. 1, dated
[___________, 20___] (herein called this "Trust Indenture Supplement") of
FIRST SECURITY BANK, NATIONAL ASSOCIATION, not in its individual capacity,
but solely as Owner Trustee (herein called the "Owner Trustee") under that
certain Trust Agreement [___] dated as of [___________, 20___] (the "Trust
Agreement"), between the Owner Trustee and the Owner Participant named
therein.

                             W I T N E S S E T H:

            WHEREAS, the Trust Indenture and Mortgage [___], dated as of
[____________, 20___] (as amended and supplemented to the date hereof, the
"Trust Indenture") between the Owner Trustee and Wilmington Trust Company, as
Mortgagee (the "Mortgagee"), provides for the execution and delivery of a
supplement thereto substantially in the form hereof, which shall particularly
describe the Aircraft, and shall specifically mortgage such Aircraft to the
Mortgagee; and

            WHEREAS, each of the Trust Agreement and Trust Indenture relates
to the Airframe and Engines described below, and a counterpart of the Trust
Indenture is attached hereto and made a part hereof and this Trust Indenture
Supplement, together with such counterpart of the Trust Indenture, is being
filed for recordation on the date hereof with the FAA as one document;

            NOW, THEREFORE, this Trust Indenture Supplement witnesseth that
the Owner Trustee hereby confirms that the Lien of the Trust Indenture on the
Trust Indenture Estate covers all of Owner Trustee's right, title and
interest in and to the following described property:

                                   AIRFRAME

            One airframe identified as follows:
                                                    FAA
                                               Registration       Manufacturer's
     Manufacturer              Model              Number           Serial Number
     ------------              -----              ------           -------------

The Boeing Company

together with all of the Owner Trustee's  right,  title and interest in and to
all Parts of whatever  nature,  whether now owned or hereinafter  acquired and
which are from time to time  incorporated  or installed in or attached to said
airframe.

                               AIRCRAFT ENGINES

            Two aircraft engines, each such engine having 750 or more rated
take-off horsepower or the equivalent thereof, identified as follows:

<PAGE>

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

together with all of Owner Trustee's  right,  title and interest in and to all
Parts of whatever  nature,  whether now owned or hereafter  acquired and which
are from time to time  incorporated  or  installed in or attached to either of
such engines.

            Together with all of Owner Trustee's right, title and interest in
and to (a) all Parts of whatever nature, which from time to time are included
within the definition of "Airframe" or "Engine", whether now owned or
hereafter acquired, including all substitutions, renewals and replacements of
and additions, improvements, accessions and accumulations to the Airframe and
Engines (other than additions, improvements, accessions and accumulations
which constitute appliances, parts, instruments, appurtenances, accessories,
furnishings or other equipment excluded from the definition of Parts) and (b)
all Aircraft Documents.

            As further security for the obligations referred to above and
secured by the Trust 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 Mortgagee, its successors and assigns,
for the security and benefit of the Loan Participants, the Note Holders and
the other holders of Secured Obligations, in the trust created by the Trust
Indenture, all of the right, title and interest of the Owner Trustee in, to
and under the Lease Supplement of even date herewith covering the property
described above.

            Notwithstanding any provision hereof, no Excluded Payment shall
constitute security for any of the aforementioned obligations.

            TO HAVE AND TO HOLD all and singular the aforesaid property unto
the Mortgagee, its successors and assigns, in trust for the equal and
proportionate benefit and security of the Loan Participants, the Note Holders
and the other holders of Secured Obligations, except as provided in Section
2.14 and Article III of the Trust Indenture without any preference,
distinction or priority of any one Equipment Note over any other by reason of
priority of time of issue, sale, negotiation, date of maturity thereof or
otherwise for any reason whatsoever, and for the uses and purposes and
subject to the terms and provisions set forth in the Trust Indenture.

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

            AND, FURTHER, the Owner Trustee hereby acknowledges that the
Aircraft referred to in this Trust Indenture Supplement and the aforesaid
Lease Supplement has been delivered to the Owner Trustee and is included in

<PAGE>

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
Trust Indenture.

                                    * * *

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

                                          FIRST SECURITY BANK, NATIONAL
                                          ASSOCIATION, not in its individual
                                              capacity, but solely as Owner
                                              Trustee, Owner Trustee

                                          By:
                                             -------------------------------
                                             Name:
                                             Title:

<PAGE>

                                                                       EXHIBIT A
                                           TO TRUST INDENTURE AND MORTGAGE [___]

                                  SCHEDULE I

                                 Original Amount             Interest Rate
                                 ---------------             -------------

Series A-1:

Series A-2:

Series B:

Series C:

Series D:

<PAGE>

                         Equipment Note Amortization

                                                 Percentage of Original
              Payment Date                          Amount to be Paid
------------------------------------- ------------------------------------------

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