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                                                                   Exhibit 10.12

                              AMENDED AND RESTATED

                           COGENT COMMUNICATIONS GROUP

                           2000 EQUITY INCENTIVE PLAN

     1. PURPOSES OF THE PLAN. The purposes of the Cogent Communications Group
2000 Equity Incentive Plan are to attract and retain the best available
personnel for positions of substantial responsibility, to provide additional
incentive to Employees, Directors and Consultants and to promote the success of
the Company's business. Options granted under the Plan may be Incentive Stock
Options or Non-Qualified Stock Options, as determined by the Administrator at
the time of grant, subject to Applicable Laws. Stock Purchase Rights may also be
granted under the Plan.

     2. DEFINITIONS. As used herein, the following definitions shall apply:

        (a) "ACQUISITION" means (i) any consolidation or merger of the Company
with or into any other corporation or other entity or person in which the
stockholders of the Company prior to such consolidation or merger own less than
fifty percent (50%) of the Company's voting power immediately after such
consolidation or merger, excluding any consolidation or merger effected
exclusively to change the domicile of the Company; or (ii) a sale of all or
substantially all of the assets of the Company.

        (b) "ADMINISTRATOR" means the Board or the Committee responsible for
conducting the general administration of the Plan, as applicable, in accordance
with Section 4 hereof.

        (c) "APPLICABLE LAWS" means the requirements relating to the
administration of stock option plans under U.S. state corporate laws, U.S.
federal and state securities laws, the Code, any stock exchange or quotation
system on which the Common Stock is listed or quoted and the applicable laws of
any foreign country or jurisdiction where Options or Stock Purchase Rights are
granted under the Plan.

        (d) "BOARD" means the Board of Directors of the Company.

        (e) "CODE" means the Internal Revenue Code of 1986, as amended.

        (f) "COMMITTEE" means a committee appointed by the Board in accordance
with Section 4 hereof.

        (g) "COMMON STOCK" means the Common Stock of the Company, par value
$.001 per share.

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        (h) "COMPANY" means Cogent Communications Group Inc., a Delaware
corporation.

        (i) "CONSULTANT" means any consultant or adviser if: (i) the consultant
or adviser renders bona fide services to the Company; (ii) the services rendered
by the consultant or adviser are not in connection with the offer or sale of
securities in a capital-raising transaction and do not directly or indirectly
promote or maintain a market for the Company's securities; and (iii) the
consultant or adviser is a natural person who has contracted directly with the
Company to render such services.

        (j) "DIRECTOR" means a member of the Board.

        (k) "EMPLOYEE" means any person, including an Officer or Director, who
is an employee (as defined in accordance with Section 3401(c) of the Code) of
the Company or any Parent or Subsidiary of the Company. A Service Provider shall
not cease to be an Employee in the case of (i) any leave of absence approved by
the Company or (ii) transfers between locations of the Company or between the
Company, its Parent, any Subsidiary, or any successor. For purposes of Incentive
Stock Options, no such leave may exceed ninety (90) days, unless reemployment
upon expiration of such leave is guaranteed by statute or contract. Neither
service as a Director nor payment of a director's fee by the Company shall be
sufficient, by itself, to constitute "employment" by the Company.

        (l) "EXCHANGE ACT" means the Securities Exchange Act of 1934, as
amended.

        (m) "FAIR MARKET VALUE" means, as of any date, the value of a share of
Common Stock determined as follows:

            (i) If the Common Stock is listed on any established stock exchange
or a national market system, including, without limitation, the Nasdaq National
Market or The Nasdaq SmallCap Market of The Nasdaq Stock Market, its Fair Market
Value shall be the closing sales price for a share of such stock (or the closing
bid, if no sales were reported) as quoted on such exchange or system for the
last market trading day prior to the time of determination, as reported in The
Wall Street Journal or such other source as the Administrator deems reliable;

            (ii) If the Common Stock is regularly quoted by a recognized
securities dealer but selling prices are not reported, its Fair Market Value
shall be the mean between the high bid and low asked prices for a share of the
Common Stock on the last market trading day prior to the day of determination;
or

            (iii) In the absence of an established market for the Common Stock,
the Fair Market Value thereof shall be determined in good faith by the
Administrator.

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        (n) "HOLDER" means a person who has been granted or awarded an Option or
Stock Purchase Right or who holds Shares acquired pursuant to the exercise of an
Option or Stock Purchase Right.

        (o) "INCENTIVE STOCK OPTION" means an Option intended to qualify as an
incentive stock option within the meaning of Section 422 of the Code and which
is designated as an Incentive Stock Option by the Administrator.

        (p) "INDEPENDENT DIRECTOR" means a Director who is not an Employee of
the Company.

        (q) "NON-QUALIFIED STOCK OPTION" means an Option (or portion thereof)
that is not designated as an Incentive Stock Option by the Administrator, or
which is designated as an Incentive Stock Option by the Administrator but fails
to qualify as an incentive stock option within the meaning of Section 422 of the
Code.

        (r) "OFFICER" means a person who is an officer of the Company within the
meaning of Section 16 of the Exchange Act and the rules and regulations
promulgated thereunder.

        (s) "OPTION" means a stock option granted pursuant to the Plan.

        (t) "OPTION AGREEMENT" means a written agreement between the Company and
a Holder evidencing the terms and conditions of an individual Option grant. The
Option Agreement is subject to the terms and conditions of the Plan.

        (u) "PARENT" means a "parent corporation," whether now or hereafter
existing, as defined in Section 424(e) of the Code.

        (v) "PLAN" means the Cogent Communications Group 2000 Equity Incentive
Plan.

        (w) "PUBLIC TRADING DATE" means the first date upon which Common Stock
of the Company is listed (or approved for listing) upon notice of issuance on
any securities exchange or designated (or approved for designation) upon notice
of issuance as a national market security on an interdealer quotation system.

        (x) "RESTRICTED STOCK" means Shares acquired pursuant to the exercise of
an unvested Option in accordance with Section 10(h) below or pursuant to a Stock
Purchase Right granted under Section 12 below.

        (y) "RULE 16b-3" means that certain Rule 16b-3 under the Exchange Act,
as such Rule may be amended from time to time.

        (z) "SECTION 16(b)" means Section 16(b) of the Exchange Act.

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        (aa) "SECURITIES ACT" means the Securities Act of 1933, as amended.

        (bb) "SERVICE PROVIDER" means an Employee, Director or Consultant.

        (cc) "SHARE" means a share of Common Stock, as adjusted in accordance
with Section 13 below.

        (dd) "STOCK PURCHASE RIGHT" means a right to purchase Common Stock
pursuant to Section 12 below.

        (ee) "SUBSIDIARY" means a "subsidiary corporation," whether now or
hereafter existing, as defined in Section 424(f) of the Code.

     3. STOCK SUBJECT TO THE PLAN. Subject to the provisions of Section 13 of
the Plan, the shares of stock subject to Options or Stock Purchase Rights shall
be Common Stock, initially shares of the Company's Common Stock, par value $.001
per share. Subject to the provisions of Section 13 of the Plan, the maximum
aggregate number of Shares which may be issued upon exercise of such Options or
Stock Purchase Rights is 9,900,000 Shares. Shares issued upon exercise of
Options or Stock Purchase Rights may be authorized but unissued, or reacquired
Shares. If an Option or Stock Purchase Right expires or becomes unexercisable
without having been exercised in full, the unpurchased Shares which were subject
thereto shall become available for future grant or sale under the Plan (unless
the Plan has terminated). Shares which are delivered by the Holder or withheld
by the Company upon the exercise of an Option or Stock Purchase Right under the
Plan, in payment of the exercise price thereof or tax withholding thereon, may
again be optioned, granted or awarded hereunder, subject to the limitations of
this Section 3. If Shares of Restricted Stock are repurchased by the Company at
their original purchase price, such Shares shall become available for future
grant under the Plan. Notwithstanding the provisions of this Section 3, no
Shares may again be optioned, granted or awarded if such action would cause an
Incentive Stock Option to fail to qualify as an Incentive Stock Option under
Code Section 422.

     4. ADMINISTRATION OF THE PLAN.

        (a) ADMINISTRATOR. Unless and until the Board delegates administration
to a Committee as set forth below, the Plan shall be administered by the Board.
The Board may delegate administration of the Plan to a Committee or Committees
of one or more members of the Board, and the term "Committee" shall apply to any
person or persons to whom such authority has been delegated. If administration
is delegated to a Committee, the Committee shall have, in connection with the
administration of the Plan, the powers theretofore possessed by the Board,
including the power to delegate to a subcommittee any of the administrative
powers the Committee is authorized to exercise (and references in this Plan to
the Board shall thereafter be to the Committee or subcommittee), subject,
however, to such resolutions, not inconsistent with the provisions of the Plan,
as may be adopted from time to time by the Board. Notwithstanding the foregoing,
however, from and after the Public Trading Date, a Committee of the Board shall

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administer the Plan and the Committee shall consist solely of two or more
Independent Directors each of whom is both an "outside director," within the
meaning of Section 162(m) of the Code, and a "non-employee director" within the
meaning of Rule 16b-3. Within the scope of such authority, the Board or the
Committee may (i) delegate to a committee of one or more members of the Board
who are not Independent Directors the authority to grant awards under the Plan
to eligible persons who are either (A) not then "covered employees," within the
meaning of Section 162(m) of the Code and are not expected to be "covered
employees" at the time of recognition of income resulting from such award or (B)
not persons with respect to whom the Company wishes to comply with Section
162(m) of the Code and/or (ii) delegate to a committee of one or more members of
the Board who are not "non-employee directors," within the meaning of Rule
16b-3, the authority to grant awards under the Plan to eligible persons who are
not then subject to Section 16 of the Exchange Act. The Board may abolish the
Committee at any time and revest in the Board the administration of the Plan.
Appointment of Committee members shall be effective upon acceptance of
appointment. Committee members may resign at any time by delivering written
notice to the Board. Vacancies in the Committee may only be filled by the Board.

        (b) POWERS OF THE ADMINISTRATOR. Subject to the provisions of the Plan
and the specific duties delegated by the Board to such Committee, and subject to
the approval of any relevant authorities, the Administrator shall have the
authority in its discretion to:

            (i) Determine the Fair Market Value;

            (ii) Select the Service Providers to whom Options and Stock Purchase
Rights may from time to time be granted hereunder;

            (iii) Determine the number of Shares to be covered by each such
award granted hereunder;

            (iv) Approve forms of agreement for use under the Plan;

            (v) Determine the terms and conditions of any Option or Stock
Purchase Right granted hereunder (such terms and conditions include, but are not
limited to, the exercise price, the time or times when Options or Stock Purchase
Rights may vest or be exercised (which may be based on performance criteria),
any vesting acceleration or waiver of forfeiture restrictions, and any
restriction or limitation regarding any Option or Stock Purchase Right or the
Common Stock relating thereto, based in each case on such factors as the
Administrator, in its sole discretion, shall determine);

            (vi) Determine whether to offer to buyout a previously granted
Option as provided in subsection 10(i) and to determine the terms and conditions
of such offer and buyout (including whether payment is to be made in cash or
Shares);

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            (vii) Prescribe, amend and rescind rules and regulations relating to
the Plan, including rules and regulations relating to sub-plans established for
the purpose of qualifying for preferred tax treatment under foreign tax laws;

            (viii) Allow Holders to satisfy withholding tax obligations by
electing to have the Company withhold from the Shares to be issued upon exercise
of an Option or Stock Purchase Right that number of Shares having a Fair Market
Value equal to the minimum amount required to be withheld based on the statutory
withholding rates for federal and state tax purposes that apply to supplemental
taxable income. The Fair Market Value of the Shares to be withheld shall be
determined on the date that the amount of tax to be withheld is to be
determined. All elections by Holders to have Shares withheld for this purpose
shall be made in such form and under such conditions as the Administrator may
deem necessary or advisable;

            (ix) Amend the Plan or any Option or Stock Purchase Right granted
under the Plan as provided in Section 15; and

            (x) Construe and interpret the terms of the Plan and awards granted
pursuant to the Plan and to exercise such powers and perform such acts as the
Administrator deems necessary or desirable to promote the best interests of the
Company which are not in conflict with the provisions of the Plan.

        (c) EFFECT OF ADMINISTRATOR'S DECISION. All decisions, determinations
and interpretations of the Administrator shall be final and binding on all
Holders.

     5. ELIGIBILITY. Non-Qualified Stock Options and Stock Purchase Rights may
be granted to Service Providers. Incentive Stock Options may be granted only to
Employees. If otherwise eligible, an Employee or Consultant who has been granted
an Option or Stock Purchase Right may be granted additional Options or Stock
Purchase Rights. Each Independent Director shall be eligible to be granted
Options in the discretion of the Administrator.

     6. LIMITATIONS.

        (a) Each Option shall be designated by the Administrator in the Option
Agreement as either an Incentive Stock Option or a Non-Qualified Stock Option.
However, notwithstanding such designations, to the extent that the aggregate
Fair Market Value of Shares subject to a Holder's Incentive Stock Options and
other incentive stock options granted by the Company, any Parent or Subsidiary,
which become exercisable for the first time during any calendar year (under all
plans of the Company or any Parent or Subsidiary) exceeds $100,000, such excess
Options or other options shall be treated as Non-Qualified Stock Options. For
purposes of this Section 6(a), Incentive Stock Options shall be taken into
account in the order in which they were granted, and the Fair Market Value of
the Shares shall be determined as of the time of grant.

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        (b) Neither the Plan, any Option nor any Stock Purchase Right shall
confer upon a Holder any right with respect to continuing the Holder's
employment or consulting relationship with the Company, nor shall they interfere
in any way with the Holder's right or the Company's right to terminate such
employment or consulting relationship at any time, with or without cause.

        (c) No Service Provider shall be granted, in any calendar year, Options
or Stock Purchase Rights to purchase more than 9,900,000 Shares; PROVIDED,
HOWEVER, that the foregoing limitation shall not apply prior to the Public
Trading Date and, following the Public Trading Date, the foregoing limitation
shall not apply until the earliest of: (i) the first material modification of
the Plan (including any increase in the number of shares reserved for issuance
under the Plan in accordance with Section 3); (ii) the issuance of all of the
shares of Common Stock reserved for issuance under the Plan; (iii) the
expiration of the Plan; (iv) the first meeting of stockholders at which
Directors of the Company are to be elected that occurs after the close of the
third calendar year following the calendar year in which occurred the first
registration of an equity security of the Company under Section 12 of the
Exchange Act; or (v) such other date required by Section 162(m) of the Code and
the rules and regulations promulgated thereunder. The foregoing limitation shall
be adjusted proportionately in connection with any change in the Company's
capitalization as described in Section 13. For purposes of this Section 6(c), if
an Option is canceled in the same calendar year it was granted (other than in
connection with a transaction described in Section 13), the canceled Option will
be counted against the limit set forth in this Section 6(c). For this purpose,
if the exercise price of an Option is reduced, the transaction shall be treated
as a cancellation of the Option and the grant of a new Option.

     7. TERM OF PLAN. The Plan shall become effective upon its initial adoption
by the Board and shall continue in effect until it is terminated under Section
15 of the Plan. No Options or Stock Purchase Rights may be issued under the Plan
after the tenth (10th) anniversary of the earlier of (a) the date upon which the
Plan is adopted by the Board or (b) the date the Plan is approved by the
stockholders.

     8. TERM OF OPTION. The term of each Option shall be stated in the Option
Agreement; PROVIDED, HOWEVER, that the term shall be no more than ten (10) years
from the date of grant thereof. In the case of an Incentive Stock Option granted
to a Holder who, at the time the Option is granted, owns (or is treated as
owning under Code Section 424) stock representing more than ten percent (10%) of
the voting power of all classes of stock of the Company or any Parent or
Subsidiary, the term of the Option shall be five (5) years from the date of
grant or such shorter term as may be provided in the Option Agreement.

     9. OPTION EXERCISE PRICE AND CONSIDERATION.

        (a) The per share exercise price for the Shares to be issued upon
exercise of an Option shall be such price as is determined by the Administrator,
PROVIDED, that in the case of an Incentive Stock Option (i) granted to an
Employee who, at the time of grant of such Option, owns (or is treated as owning
under Code Section 424) stock representing more than ten percent

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(10%) of the voting power of all classes of stock of the Company or any Parent
or Subsidiary, the per Share exercise price shall be no less than one hundred
ten percent (110%) of the Fair Market Value per Share on the date of grant, and
(ii) granted to any other Employee, the per Share exercise price shall be no
less than one hundred percent (100%) of the Fair Market Value per Share on the
date of grant. Notwithstanding the foregoing subsections (i) and (ii), Options
may be granted with a per Share exercise price other than as required above
pursuant to a merger or other corporate transaction.

        (b) The consideration to be paid for the Shares to be issued upon
exercise of an Option, including the method of payment, shall be determined by
the Administrator (and, in the case of an Incentive Stock Option, shall be
determined at the time of grant). Such consideration may consist of (i) cash,
(ii) check, (iii) with the consent of the Administrator, a full recourse
promissory note bearing interest (at no less than such rate as shall then
preclude the imputation of interest under the Code) and payable upon such terms
as may be prescribed by the Administrator, (iv) with the consent of the
Administrator, other Shares which (A) in the case of Shares acquired from the
Company, have been owned by the Holder for more than six (6) months on the date
of surrender, and (B) have a Fair Market Value on the date of surrender equal to
the aggregate exercise price of the Shares as to which such Option shall be
exercised, (v) with the consent of the Administrator, surrendered Shares then
issuable upon exercise of the Option having a Fair Market Value on the date of
exercise equal to the aggregate exercise price of the Option or exercised
portion thereof, (vi) property of any kind which constitutes good and valuable
consideration, (vii) with the consent of the Administrator, delivery of a notice
that the Holder has placed a market sell order with a broker with respect to
Shares then issuable upon exercise of the Options and that the broker has been
directed to pay a sufficient portion of the net proceeds of the sale to the
Company in satisfaction of the Option exercise price, PROVIDED, that payment of
such proceeds is then made to the Company upon settlement of such sale, or
(viii) with the consent of the Administrator, any combination of the foregoing
methods of payment.

     10. EXERCISE OF OPTION.

        (a) VESTING; FRACTIONAL EXERCISES. Options granted hereunder shall be
vested and exercisable according to the terms hereof at such times and under
such conditions as determined by the Administrator and set forth in the Option
Agreement. An Option may not be exercised for a fraction of a Share.

        (b) DELIVERIES UPON EXERCISE. All or a portion of an exercisable Option
shall be deemed exercised upon delivery of all of the following to the Secretary
of the Company or his or her office:

            (i) A written or electronic notice complying with the applicable
rules established by the Administrator stating that the Option, or a portion
thereof, is exercised. The notice shall be signed by the Holder or other person
then entitled to exercise the Option or such portion of the Option;

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            (ii) Such representations and documents as the Administrator, in its
absolute discretion, deems necessary or advisable to effect compliance with
Applicable Laws. The Administrator may, in its absolute discretion, also take
whatever additional actions it deems appropriate to effect such compliance,
including, without limitation, placing legends on share certificates and issuing
stop transfer notices to agents and registrars;

            (iii) Upon the exercise of all or a portion of an unvested Option
pursuant to Section 10(h), a Restricted Stock purchase agreement in a form
determined by the Administrator and signed by the Holder or other person then
entitled to exercise the Option or such portion of the Option; and

            (iv) In the event that the Option shall be exercised pursuant to
Section 10(f) by any person or persons other than the Holder, appropriate proof
of the right of such person or persons to exercise the Option.

        (c) CONDITIONS TO DELIVERY OF SHARE CERTIFICATES. The Company shall not
be required to issue or deliver any certificate or certificates for Shares
purchased upon the exercise of any Option or portion thereof prior to
fulfillment of all of the following conditions:

            (i) The admission of such Shares to listing on all stock exchanges
on which such class of stock is then listed;

            (ii) The completion of any registration or other qualification of
such Shares under any state or federal law, or under the rulings or regulations
of the Securities and Exchange Commission or any other governmental regulatory
body which the Administrator shall, in its absolute discretion, deem necessary
or advisable;

            (iii) The obtaining of any approval or other clearance from any
state or federal governmental agency which the Administrator shall, in its
absolute discretion, determine to be necessary or advisable;

            (iv) The lapse of such reasonable period of time following the
exercise of the Option as the Administrator may establish from time to time for
reasons of administrative convenience; and

            (v) The receipt by the Company of full payment for such Shares,
including payment of any applicable withholding tax, which in the discretion of
the Administrator may be in the form of consideration used by the Holder to pay
for such Shares under Section 9(b).

        (d) TERMINATION OF RELATIONSHIP AS A SERVICE PROVIDER. If a Holder
ceases to be a Service Provider other than by reason of the Holder's disability
or death, such Holder may exercise his or her Option within such period of time
as is specified in the Option Agreement to the extent that the Option is vested
on the date of termination (but in no event later than the expiration of the
term of the Option as set forth in the Option Agreement). In the absence of a

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specified time in the Option Agreement, the Option shall remain exercisable for
three (3) months following the Holder's termination. If, on the date of
termination, the Holder is not vested as to his or her entire Option, the Shares
covered by the unvested portion of the Option immediately cease to be issuable
under the Option and shall again become available for issuance under the Plan.
If, after termination, the Holder does not exercise his or her Option within the
time period specified herein, the Option shall terminate, and the Shares covered
by such Option shall again become available for issuance under the Plan.

        (e) DISABILITY OF HOLDER. If a Holder ceases to be a Service Provider as
a result of the Holder's disability, the Holder may exercise his or her Option
within such period of time as is specified in the Option Agreement to the extent
the Option is vested on the date of termination (but in no event later than the
expiration of the term of such Option as set forth in the Option Agreement). In
the absence of a specified time in the Option Agreement, the Option shall remain
exercisable for twelve (12) months following the Holder's termination. If such
disability is not a "disability" as such term is defined in Section 22(e)(3) of
the Code, in the case of an Incentive Stock Option such Incentive Stock Option
shall automatically cease to be treated as an Incentive Stock Option and shall
be treated for tax purposes as a Non-Qualified Stock Option from and after the
day which is three (3) months and one (1) day following such termination. If, on
the date of termination, the Holder is not vested as to his or her entire
Option, the Shares covered by the unvested portion of the Option shall
immediately cease to be issuable under the Option and shall again become
available for issuance under the Plan. If, after termination, the Holder does
not exercise his or her Option within the time specified herein, the Option
shall terminate, and the Shares covered by such Option shall again become
available for issuance under the Plan.

        (f) DEATH OF HOLDER. If a Holder dies while a Service Provider, the
Option may be exercised within such period of time as is specified in the Option
Agreement (but in no event later than the expiration of the term of such Option
as set forth in the Notice of Grant), by the Holder's estate or by a person who
acquires the right to exercise the Option by bequest or inheritance, but only to
the extent that the Option is vested on the date of death. In the absence of a
specified time in the Option Agreement, the Option shall remain exercisable for
twelve (12) months following the Holder's termination. If, at the time of death,
the Holder is not vested as to his or her entire Option, the Shares covered by
the unvested portion of the Option shall immediately cease to be issuable under
the Option and shall again become available for issuance under the Plan. The
Option may be exercised by the executor or administrator of the Holder's estate
or, if none, by the person(s) entitled to exercise the Option under the Holder's
will or the laws of descent or distribution. If the Option is not so exercised
within the time specified herein, the Option shall terminate, and the Shares
covered by such Option shall again become available for issuance under the Plan.

        (g) REGULATORY EXTENSION. A Holder's Option Agreement may provide that
if the exercise of the Option following the termination of the Holder's status
as a Service Provider (other than upon the Holder's death or Disability) would
be prohibited at any time solely because the issuance of shares would violate
the registration requirements under the Securities Act, then

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the Option shall terminate on the earlier of (i) the expiration of the term of
the Option set forth in Section 8 or (ii) the expiration of a period of three
(3) months after the termination of the Holder's status as a Service Provider
during which the exercise of the Option would not be in violation of such
registration requirements.

        (h) EARLY EXERCISABILITY. The Administrator may provide in the terms of
a Holder's Option Agreement that the Holder may, at any time before the Holder's
status as a Service Provider terminates, exercise the Option in whole or in part
prior to the full vesting of the Option; PROVIDED, HOWEVER, that subject to
Section 20, Shares acquired upon exercise of an Option which has not fully
vested may be subject to any forfeiture, transfer or other restrictions as the
Administrator may determine in its sole discretion.

        (i) BUYOUT PROVISIONS. The Administrator may at any time offer to buyout
for a payment in cash or Shares, an Option previously granted, based on such
terms and conditions as the Administrator shall establish and communicate to the
Holder at the time that such offer is made.

     11. NON-TRANSFERABILITY OF OPTIONS AND STOCK PURCHASE RIGHTS. Options and
Stock Purchase Rights may not be sold, pledged, assigned, hypothecated,
transferred, or disposed of in any manner other than by will or by the laws of
descent or distribution and may be exercised, during the lifetime of the Holder,
only by the Holder.

     12. STOCK PURCHASE RIGHTS.

        (a) RIGHTS TO PURCHASE. Stock Purchase Rights may be issued either
alone, in addition to, or in tandem with Options granted under the Plan and/or
cash awards made outside of the Plan. After the Administrator determines that it
will offer Stock Purchase Rights under the Plan, it shall advise the offeree in
writing of the terms, conditions and restrictions related to the offer,
including the number of Shares that such person shall be entitled to purchase,
the price to be paid, and the time within which such person must accept such
offer. The offer shall be accepted by execution of a Restricted Stock purchase
agreement in the form determined by the Administrator.

        (b) REPURCHASE RIGHT. Unless the Administrator determines otherwise, the
Restricted Stock purchase agreement shall grant the Company the right to
repurchase Shares acquired upon exercise of a Stock Purchase Right upon the
termination of the purchaser's status as a Service Provider for any reason.
Subject to Section 20, the purchase price for Shares repurchased by the Company
pursuant to such repurchase right and the rate at with such repurchase right
shall lapse shall be determined by the Administrator in its sole discretion, and
shall be set forth in the Restricted Stock purchase agreement.

        (c) OTHER PROVISIONS. The Restricted Stock purchase agreement shall
contain such other terms, provisions and conditions not inconsistent with the
Plan as may be determined by the Administrator in its sole discretion.

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        (d) RIGHTS AS A SHAREHOLDER. Once the Stock Purchase Right is exercised,
the purchaser shall have rights equivalent to those of a shareholder and shall
be a shareholder when his or her purchase is entered upon the records of the
duly authorized transfer agent of the Company. No adjustment shall be made for a
dividend or other right for which the record date is prior to the date the Stock
Purchase Right is exercised, except as provided in Section 13 of the Plan.

     13. ADJUSTMENTS UPON CHANGES IN CAPITALIZATION, MERGER OR ASSET SALE.

        (a) In the event that the Administrator determines that any dividend or
other distribution (whether in the form of cash, Common Stock, other securities,
or other property), recapitalization, reclassification, stock split, reverse
stock split, reorganization, merger, consolidation, split-up, spin-off,
combination, repurchase, liquidation, dissolution, or sale, transfer, exchange
or other disposition of all or substantially all of the assets of the Company,
or exchange of Common Stock or other securities of the Company, issuance of
warrants or other rights to purchase Common Stock or other securities of the
Company, or other similar corporate transaction or event, in the Administrator's
sole discretion, affects the Common Stock such that an adjustment is determined
by the Administrator to be appropriate in order to prevent dilution or
enlargement of the benefits or potential benefits intended to be made available
under the Plan or with respect to any Option, Stock Purchase Right or Restricted
Stock, then the Administrator shall, in such manner as it may deem equitable,
adjust any or all of:

            (i) The number and kind of shares of Common Stock (or other
securities or property) with respect to which Options or Stock Purchase Rights
may be granted or awarded (including, but not limited to, adjustments of the
limitations in Section 3 on the maximum number and kind of shares which may be
issued and adjustments of the maximum number of Shares that may be purchased by
any Holder in any calendar year pursuant to Section 6(c));

            (ii) The number and kind of shares of Common Stock (or other
securities or property) subject to outstanding Options, Stock Purchase Rights or
Restricted Stock; and

            (iii) The grant or exercise price with respect to any Option or
Stock Purchase Right.

        (b) In the event of any transaction or event described in Section 13(a),
the Administrator, in its sole and absolute discretion, and on such terms and
conditions as it deems appropriate, either by the terms of the Option, Stock
Purchase Right or Restricted Stock or by action taken prior to the occurrence of
such transaction or event and either automatically or upon the Holder's request,
is hereby authorized to take any one or more of the following actions whenever
the Administrator determines that such action is appropriate in order to prevent
dilution or enlargement of the benefits or potential benefits intended to be
made available under

                                       12
<Page>

the Plan or with respect to any Option, Stock Purchase Right or Restricted Stock
granted or issued under the Plan or to facilitate such transaction or event:

            (i) To provide for either the purchase of any such Option, Stock
Purchase Right or Restricted Stock for an amount of cash equal to the amount
that could have been obtained upon the exercise of such Option or Stock Purchase
Right or realization of the Holder's rights had such Option, Stock Purchase
Right or Restricted Stock been currently exercisable or payable or fully vested
or the replacement of such Option, Stock Purchase Right or Restricted Stock with
other rights or property selected by the Administrator in its sole discretion;

            (ii) To provide that such Option or Stock Purchase Right shall be
exercisable as to all shares covered thereby, notwithstanding anything to the
contrary in the Plan or the provisions of such Option or Stock Purchase Right;

            (iii) To provide that such Option, Stock Purchase Right or
Restricted Stock be assumed by the successor or survivor corporation, or a
parent or subsidiary thereof, or shall be substituted for by similar options,
rights or awards covering the stock of the successor or survivor corporation, or
a parent or subsidiary thereof, with appropriate adjustments as to the number
and kind of shares and prices;

            (iv) To make adjustments in the number and type of shares of Common
Stock (or other securities or property) subject to outstanding Options and Stock
Purchase Rights, and/or in the terms and conditions of (including the grant or
exercise price), and the criteria included in, outstanding Options, Stock
Purchase Rights or Restricted Stock or Options, Stock Purchase Rights or
Restricted Stock which may be granted in the future; and

            (v) To provide that immediately upon the consummation of such event,
such Option or Stock Purchase Right shall not be exercisable and shall
terminate; PROVIDED, that for a specified period of time prior to such event,
such Option or Stock Purchase Right shall be exercisable as to all Shares
covered thereby, and the restrictions imposed under an Option Agreement or
Restricted Stock purchase agreement upon some or all Shares may be terminated
and, in the case of Restricted Stock, some or all shares of such Restricted
Stock may cease to be subject to repurchase, notwithstanding anything to the
contrary in the Plan or the provisions of such Option, Stock Purchase Right or
Restricted Stock purchase agreement.

        (c) Subject to Section 3, the Administrator may, in its discretion,
include such further provisions and limitations in any Option, Stock Purchase
Right, Restricted Stock agreement or certificate, as it may deem equitable and
in the best interests of the Company.

        (d) If the Company undergoes an Acquisition, then any surviving
corporation or entity or acquiring corporation or entity, or affiliate of such
corporation or entity, may assume any Options, Stock Purchase Rights or
Restricted Stock outstanding under the Plan or may substitute similar stock
awards (including an award to acquire the same consideration paid to the

                                       13
<Page>

stockholders in the transaction described in this subsection 13(d)) for those
outstanding under the Plan. In the event any surviving corporation or entity or
acquiring corporation or entity in an Acquisition does not assume such Options,
Stock Purchase Rights or Restricted Stock or does not substitute similar stock
awards for those outstanding under the Plan, then with respect to (i) Options,
Stock Purchase Rights or Restricted Stock held by participants in the Plan whose
status as a Service Provider has not terminated prior to such event, the vesting
of such Options, Stock Purchase Rights or Restricted Stock (and, if applicable,
the time during which such awards may be exercised) shall be accelerated and
made fully exercisable and all restrictions thereon shall lapse at least ten
(10) days prior to the closing of the Acquisition (and the Options or Stock
Purchase Rights terminated if not exercised prior to the closing of such
Acquisition), and (ii) any other Options or Stock Purchase Rights outstanding
under the Plan, such Options or Stock Purchase rights shall be terminated if not
exercised prior to the closing of the Acquisition.

        (e) Notwithstanding the foregoing, in the event that the Company becomes
a party to a transaction that is intended to qualify for "pooling of interests"
accounting treatment and, but for one or more of the provisions of this Plan or
any Option Agreement or any Restricted Stock purchase agreement would so
qualify, then this Plan and any such agreement shall be interpreted so as to
preserve such accounting treatment, and to the extent that any provision of the
Plan or any such agreement would disqualify the transaction from pooling of
interests accounting treatment (including, if applicable, an entire Option
Agreement or Restricted Stock purchase agreement), then such provision shall be
null and void. All determinations to be made in connection with the preceding
sentence shall be made by the independent accounting firm whose opinion with
respect to "pooling of interests" treatment is required as a condition to the
Company's consummation of such transaction.

        (f) The existence of the Plan, any Option Agreement or Restricted Stock
purchase agreement and the Options or Stock Purchase Rights granted hereunder
shall not affect or restrict in any way the right or power of the Company or the
stockholders of the Company to make or authorize any adjustment,
recapitalization, reorganization or other change in the Company's capital
structure or its business, any merger or consolidation of the Company, any issue
of stock or of options, warrants or rights to purchase stock or of bonds,
debentures, preferred or prior preference stocks whose rights are superior to or
affect the Common Stock or the rights thereof or which are convertible into or
exchangeable for Common Stock, or the dissolution or liquidation of the Company,
or any sale or transfer of all or any part of its assets or business, or any
other corporate act or proceeding, whether of a similar character or otherwise.

     14. TIME OF GRANTING OPTIONS AND STOCK PURCHASE RIGHTS. The date of grant
of an Option or Stock Purchase Right shall, for all purposes, be the date on
which the Administrator makes the determination granting such Option or Stock
Purchase Right, or such other date as is determined by the Administrator. Notice
of the determination shall be given to each Employee or Consultant to whom an
Option or Stock Purchase Right is so granted within a reasonable time after the
date of such grant.

     15. AMENDMENT AND TERMINATION OF THE PLAN.

                                       14
<Page>

        (a) AMENDMENT AND TERMINATION. The Board may at any time wholly or
partially amend, alter, suspend or terminate the Plan. However, without approval
of the Company's stockholders given within twelve (12) months before or after
the action by the Board, no action of the Board may, except as provided in
Section 13, increase the limits imposed in Section 3 on the maximum number of
Shares which may be issued under the Plan or extend the term of the Plan under
Section 7.

        (b) STOCKHOLDER APPROVAL. The Board shall obtain stockholder approval of
any Plan amendment to the extent necessary and desirable to comply with
Applicable Laws.

        (c) EFFECT OF AMENDMENT OR TERMINATION. No amendment, alteration,
suspension or termination of the Plan shall impair the rights of any Holder,
unless mutually agreed otherwise between the Holder and the Administrator, which
agreement must be in writing and signed by the Holder and the Company.
Termination of the Plan shall not affect the Administrator's ability to exercise
the powers granted to it hereunder with respect to Options, Stock Purchase
Rights or Restricted Stock granted or awarded under the Plan prior to the date
of such termination.

     16. STOCKHOLDER APPROVAL. The Plan will be submitted for the approval of
the Company's stockholders within twelve (12) months after the date of the
Board's initial adoption of the Plan. Options, Stock Purchase Rights or
Restricted Stock may be granted or awarded prior to such stockholder approval,
provided that such Options, Stock Purchase Rights and Restricted Stock shall not
be exercisable, shall not vest and the restrictions thereon shall not lapse
prior to the time when the Plan is approved by the stockholders, and provided
further that if such approval has not been obtained at the end of said
twelve-month period, all Options, Stock Purchase Rights and Restricted Stock
previously granted or awarded under the Plan shall thereupon be canceled and
become null and void.

     17. INABILITY TO OBTAIN AUTHORITY. The inability of the Company to obtain
authority from any regulatory body having jurisdiction, which authority is
deemed by the Company's counsel to be necessary to the lawful issuance and sale
of any Shares hereunder, shall relieve the Company of any liability in respect
of the failure to issue or sell such Shares as to which such requisite authority
shall not have been obtained.

     18. RESERVATION OF SHARES. The Company, during the term of this Plan, shall
at all times reserve and keep available such number of Shares as shall be
sufficient to satisfy the requirements of the Plan.

     19. INFORMATION TO HOLDERS AND PURCHASERS. To the extent required by any
Applicable Laws, the Company shall provide to each Holder and to each individual
who acquires Shares pursuant to the Plan, not less frequently than annually
during the period such Holder or purchaser has one or more Options or Stock
Purchase Rights outstanding, and, in the case of an individual who acquires
Shares pursuant to the Plan, during the period such individual owns such Shares,
copies of annual financial statements. Notwithstanding the preceding sentence,
the Company

                                       15
<Page>

shall not be required to provide such statements to key employees whose duties
in connection with the Company assure their access to equivalent information.

     20. REPURCHASE PROVISIONS. The Administrator in its discretion may provide
that the Company may repurchase Shares acquired upon exercise of an Option or
Stock Purchase Right upon a Holder's termination as a Service Provider;
PROVIDED, that any such repurchase right shall be set forth in the applicable
Option Agreement or Restricted Stock purchase agreement or in another agreement
referred to in such agreement.

     21. INVESTMENT INTENT. The Company may require a Plan participant, as a
condition of exercising or acquiring stock under any Option or Stock Purchase
Right, (i) to give written assurances satisfactory to the Company as to the
participant's knowledge and experience in financial and business matters and/or
to employ a purchaser representative reasonably satisfactory to the Company who
is knowledgeable and experienced in financial and business matters and that he
or she is capable of evaluating, alone or together with the purchaser
representative, the merits and risks of exercising the Option or Stock Purchase
Right; and (ii) to give written assurances satisfactory to the Company stating
that the participant is acquiring the stock subject to the Option or Stock
Purchase Right for the participant's own account and not with any present
intention of selling or otherwise distributing the stock. The foregoing
requirements, and any assurances given pursuant to such requirements, shall be
inoperative if (A) the issuance of the shares upon the exercise or acquisition
of stock under the applicable Option or Stock Purchase Right has been registered
under a then currently effective registration statement under the Securities Act
or (B) as to any particular requirement, a determination is made by counsel for
the Company that such requirement need not be met in the circumstances under the
then applicable securities laws. The Company may, upon advice of counsel to the
Company, place legends on stock certificates issued under the Plan as such
counsel deems necessary or appropriate in order to comply with applicable
securities laws, including, but not limited to, legends restricting the transfer
of the stock.

     22. GOVERNING LAW. The validity and enforceability of this Plan shall be
governed by and construed in accordance with the laws of the State of Delaware
without regard to otherwise governing principles of conflicts of law.

     23. APPLICABILITY OF STOCKHOLDERS AGREEMENT. Upon receipt of any Option or
Stock Purchase Right, each participant under this Plan shall, automatically and
without further action on his or her part, (i) be deemed to be a party to, a
signatory of and bound by the Stockholders Agreement, dated March 14, 2001,
between the Company and the equity holders listed therein (the "Stockholders
Agreement").

                                  * * * * * * *

                                       16
<Page>

     I hereby certify that the Plan was duly adopted by the Stockholders of
Cogent Communications Group, Inc. on March 14, 2001.

     Executed in Washington, DC as of the 14th day of March 2001.

                                 /s/ DAVE SCHAEFFER
                                 ------------------------------------
                                 Dave Schaeffer
                                 President

                                  * * * * * * *

     I hereby certify that the Plan was duly adopted by the Board of Directors
of Cogent Communications Group, Inc. on March 7, 2001.

     Executed in Washington, DC as of the 14th day of March 2001.

                                 /s/ DAVE SCHAEFFER
                                 ------------------------------------
                                 Dave Schaeffer
                                 President

                                       17EXHIBIT 4(a)(1)

                                                                  EXECUTION COPY

                         TRUST SUPPLEMENT NO. 2001-1A-1

                         Dated as of September 17, 2001

                                     between

                              DELTA AIR LINES, INC.

                                       and

               STATE STREET BANK AND TRUST COMPANY OF CONNECTICUT,
                              NATIONAL ASSOCIATION,

                                   as Trustee,

                                       To

                          PASS THROUGH TRUST AGREEMENT
                          Dated as of November 16, 2000

               Delta Air Lines, Inc. Pass Through Trust 2001-1A-1
                             6.619% Delta Air Lines
                           Pass Through Certificates,
                                Series 2001-1A-1

<PAGE>

                         TRUST SUPPLEMENT NO. 2001-1A-1

            This TRUST SUPPLEMENT NO. 2001-1A-1, dated as of September 17, 2001
(the "Trust Supplement"), between DELTA AIR LINES, INC., a Delaware corporation,
and STATE STREET BANK AND TRUST COMPANY OF CONNECTICUT, NATIONAL ASSOCIATION, a
national banking association, as Trustee, to the Pass Through Trust Agreement,
dated as of November 16, 2000, between the Company (such term and other
capitalized terms used herein without definition being defined as provided in
Section 1.01) and the Trustee (the "Basic Agreement").

                              W I T N E S S E T H:

            WHEREAS, the Basic Agreement, which is unlimited as to the aggregate
face amount of Certificates that may be issued and authenticated thereunder, has
heretofore or concurrently herewith been executed and delivered;

            WHEREAS, the Company is the Owner of 36 aircraft described in
Schedule III (collectively, the "Aircraft");

            WHEREAS, pursuant to each Indenture, the Company will issue the
Equipment Notes, which Equipment Notes are to be secured by a security interest
in all right, title and interest of the Company in and to the Aircraft and
certain other property described therein;

            WHEREAS, the Trustee shall hereby declare the creation of the Class
A-1 Trust (as defined below) for the benefit of Holders of the Class A-1
Certificates (as defined below) to be issued in respect of such Class A-1 Trust,
and the initial Holders of the Class A-1 Certificates, as grantors of such Class
A-1 Trust, by their respective acceptances of the Class A-1 Certificates, shall
join in the creation of the Class A-1 Trust with the Trustee;

            WHEREAS, all Certificates to be issued by the Class A-1 Trust will
evidence Fractional Undivided Interests in the Class A-1 Trust and will have no
rights, benefits or interests in respect of any other separate Trust or the
property held therein;

            WHEREAS, pursuant to the terms and conditions of the Basic
Agreement, as supplemented by this Trust Supplement and the Participation
Agreements, the Trustee on behalf of the Class A-1 Trust shall purchase the
Equipment Notes issued by the Company pursuant to the Indentures relating to the
Aircraft having the identical interest rate as, and final maturity dates not
later than the final Regular Distribution Date of, the Class A-1 Certificates
issued hereunder and shall hold such Equipment Notes in trust for the benefit of
the Class A-1 Certificateholders;

            WHEREAS, pursuant to the terms and conditions of the Intercreditor
Agreement referred to in Section 3.01(h) hereof (the "Intercreditor Agreement"),
the Trustee and the other parties thereto will agree to the terms of
subordination set forth therein;

            WHEREAS, all of the conditions and requirements necessary to make
this Trust Supplement, when duly executed and delivered, a valid, binding and
legal instrument in accordance with its terms and for the purposes herein
expressed, have been done, performed and fulfilled, and the execution and
delivery of this Trust Supplement in the form and with the terms hereof have
been in all respects duly authorized;

            WHEREAS, this Trust Supplement is subject to the provisions of the
Trust Indenture Act and shall, to the extent applicable, be governed by such
provisions;

            NOW THEREFORE, in consideration of the mutual agreements herein
contained, and of other good and valuable consideration the receipt and adequacy
of which are hereby acknowledged, the parties hereto agree as follows:

                                   ARTICLE I

                                   DEFINITIONS

            Section 1.01 Definitions. Unless otherwise specified herein or the
context otherwise requires, capitalized terms used but not defined herein shall
have the respective meanings set forth, and shall be construed and interpreted
in the manner described, in the Basic Agreement or, to the extent not defined
therein, in the Intercreditor Agreement.

                                   ARTICLE II

                              DECLARATION OF TRUST

            Section 2.01 Declaration of Trust. The Trustee hereby declares the
creation of a Trust, designated the "Delta Air Lines Pass Through Trust
2001-1A-1" (the "Class A-1 Trust"), for the benefit of the Holders of the Class
A-1 Certificates to be issued in respect of such Class A-1 Trust, and the
initial Holders of the Class A-1 Certificates, as grantors of such Class A-1
Trust, by their respective acceptances of the Class A-1 Certificates, join in
the creation of such Class A-1 Trust with the Trustee. The Trustee, by the
execution and delivery of this Trust Supplement, acknowledges its acceptance of
all right, title and interest in and to the Trust Property to be acquired
pursuant to Section 2.02 of the Basic Agreement and the Participation Agreements
and the Trustee will hold such right, title and interest for the benefit of all
present and future Holders of the Class A-1 Certificates, upon the trusts set
forth in the Basic Agreement and this Trust Supplement.

                                  ARTICLE III

                                THE CERTIFICATES

            Section 3.01 The Certificates. There is hereby created a series of
Certificates to be issued under this Agreement designated as "6.619% Delta Air
Lines Pass Through Certificates, Series 2001-1A-1" (the "Class A-1
Certificates"). Each Class A-1 Certificate represents a Fractional Undivided
Interest in the Class A-1 Trust created hereby. The Class A-1 Certificates shall
be the only instruments evidencing a Fractional Undivided Interest in the Class
A-1 Trust.

            The terms and conditions applicable to the Class A-1 Certificates
and the Class A-1 Trust are as follows:

            (a) The aggregate face amount of the Class A-1 Certificates that may
      be authenticated and delivered under this Agreement (except for Class A-1
      Certificates authenticated and delivered upon registration of transfer of,
      or in exchange for, or in lieu of, other Class A-1 Certificates pursuant
      to Sections 3.03, 3.04, 3.05 and 3.06 of the Basic Agreement) is
      $300,000,000.

            (b) The Cut-off Date is October 19, 2001.

            (c) The Regular Distribution Dates with respect to any payment of
      Scheduled Payments means March 18 and September 18 of each year,
      commencing on March 18, 2002, until payment of all of the Scheduled
      Payments to be made under the Equipment Notes has been made. The principal
      amount of the Equipment Notes to be held by the Class A-1 Trust is
      scheduled for payment on March 18 and September 18 in certain years,
      beginning on March 18, 2002 and ending on March 18, 2011, as set out in
      Schedules I-A and I-B.

            (d) The Special Distribution Dates with respect to the Class A-1
      Certificates means any Business Day on which a Special Payment is to be
      distributed pursuant to this Agreement.

            (e) The Class A-1 Certificates shall be in the form attached hereto
      as Exhibit A, shall be Book-Entry Certificates and shall be subject to the
      conditions set forth in the Letter of Representations between the Company
      and The Depository Trust Company, as initial Clearing Agency, attached
      hereto as Exhibit B.

            (f) The proceeds of the Class A-1 Certificates issued by the Class
      A-1 Trust shall be used to acquire the Equipment Notes described in
      Schedule II, such Equipment Notes to relate to the Aircraft described in
      Schedule III and the Note Documents described in Schedule IV.

            (g) Any Person acquiring or accepting a Class A-1 Certificate or an
      interest therein will, by such acquisition or acceptance, be deemed to
      represent and warrant to the Company, the Loan Trustees and the Trustee
      that either (i) no assets of an employee benefit plan subject to Title I
      of ERISA, or of an employee benefit plan or an individual retirement
      account subject to Section 4975 of the Internal Revenue Code of 1986, as
      amended (the "Code"), or any trust established under such plan or account,
      have been used to purchase Class A-1 Certificates or an interest therein
      or (ii) the purchase and holding of Class A-1 Certificates or interests
      therein by such Person is exempt from the prohibited transaction
      restrictions of ERISA and the Code pursuant to one or more prohibited
      transaction statutory or administrative exemptions.

            (h) The Class A-1 Certificates will be subject to the following
      Intercreditor Agreement (and to the extent the terms thereof (including
      the definitions of defined terms) are inconsistent with the terms of this
      Agreement, such Intercreditor Agreement shall control): that certain
      Intercreditor Agreement, dated as of the date hereof, among State Street
      Bank and Trust Company of Connecticut, National Association, as Trustee
      under each Trust (as defined therein), Landesbank Hessen-Thuringen
      Girozentrale, as Class A-1 Liquidity Provider, Class A-2 Liquidity
      Provider, Class B Liquidity Provider and Class C Liquidity Provider, and
      State Street Bank and Trust Company of Connecticut, National Association,
      as Subordination Agent thereunder. Potential Purchasers shall have the
      rights upon the occurrence of a Triggering Event set forth in Article IV
      hereof. The Trustee and, by acceptance of any Class A-1 Certificate, each
      Certificateholder thereof, agrees to be bound by all of the provisions of
      the Intercreditor Agreement, including the subordination provisions of
      Section 9.09 thereof.

            (i) The Class A-1 Certificates will have the benefit of the
      following Liquidity Facility: that certain Revolving Credit Agreement,
      dated as of the date hereof, between State Street Bank and Trust Company
      of Connecticut, National Association, as Subordination Agent under the
      Intercreditor Agreement, as agent and trustee for the Class A-1 Trust, and
      Landesbank Hessen-Thuringen Girozentrale.

            (j) Subject to Section 2.02(b) of the Basic Agreement, there will
      not be any deposit agreement, escrow agreement or other similar
      arrangement prior to delivery of the Aircraft.

            (k) The Company may at any time purchase any of the Class A-1
      Certificates at any price in the open market and may hold such Class A-1
      Certificates to maturity.

            (l) The Responsible Party is the Company.

            Section 3.02 Delivery of Documents. The Trustee is hereby directed
(i) to execute and deliver the Intercreditor Agreement referred to in Section
3.01(h) of this Trust Supplement in the form delivered to the Trustee by the
Company and (ii) subject to the respective terms thereof, to perform its
obligations thereunder.

                                   ARTICLE IV

                                     DEFAULT

            Section 4.01 Purchase Rights of Certificateholders. (a) By
acceptance of its Class A-1 Certificate, each Class A-1 Certificateholder agrees
that at any time after the occurrence and during the continuation of a
Triggering Event,

            (i) if the Class A-2 Trustee is then the Controlling Party, each
      Class A-1 Certificateholder shall have the right to purchase, for the
      purchase price set forth in the Class A-2 Trust Agreement, all, but not
      less than all, of the Class A-2 Certificates upon ten days' prior written
      notice to the Class A-2 Trustee and each other Class A-1
      Certificateholder, provided that (A) if prior to the end of such ten-day
      period any other Class A-1 Certificateholder notifies such purchasing
      Class A-1 Certificateholder that such other Class A-1 Certificateholder
      wants to participate in such purchase, then such other Class A-1
      Certificateholder may join with the purchasing Class A-1 Certificateholder
      to purchase all, but not less than all, of the Class A-2 Certificates pro
      rata based on the Fractional Undivided Interest in the Class A-1 Trust
      held by each such Class A-1 Certificateholder and (B) if prior to the end
      of such ten-day period any other Class A-1 Certificateholder fails to
      notify the purchasing Class A-1 Certificateholder of such other Class A-1
      Certificateholder's desire to participate in such a purchase, then such
      other Class A-1 Certificateholder shall lose its right to purchase the
      Class A-2 Certificates pursuant to this Section 4.01(a)(i); and

            (ii) if the Trustee is then the Controlling Party, each Class A-2
      Certificateholder shall have the right to purchase all, but not less than
      all, of the Class A-1 Certificates upon ten days' prior written notice to
      the Trustee and each other Class A-2 Certificateholder, provided that (A)
      if prior to the end of such ten-day period any other Class A-2
      Certificateholder notifies such purchasing Class A-2 Certificateholder
      that such other Class A-2 Certificateholder wants to participate in such
      purchase, then such other Class A-2 Certificateholder may join with the
      purchasing Class A-2 Certificateholder to purchase all, but not less than
      all, of the Class A-1 Certificates pro rata based on the Fractional
      Undivided Interest in the Class A-2 Trust held by each such Class A-2
      Certificateholder and (B) if prior to the end of such ten-day period any
      other Class A-2 Certificateholder fails to notify the purchasing Class A-2
      Certificateholder of such other Class A-2 Certificateholder's desire to
      participate in such a purchase, then such other Class A-2
      Certificateholder shall lose its right to purchase the Class A-1
      Certificates pursuant to this Section 4.01(a)(ii); and

            (iii) each Class B Certificateholder shall have the right (which
      shall not expire upon any purchase of the Class A-1 Certificates or the
      Class A-2 Certificates pursuant to clause (i) or (ii) above) to purchase
      all, but not less than all, of the Class A-1 Certificates and the Class
      A-2 Certificates upon ten days' prior written notice to the Trustee, the
      Class A-2 Trustee and each other Class B Certificateholder, provided that
      (A) if prior to the end of such ten-day period any other Class B
      Certificateholder notifies such purchasing Class B Certificateholder that
      such other Class B Certificateholder wants to participate in such
      purchase, then such other Class B Certificateholder may join with the
      purchasing Class B Certificateholder to purchase all, but not less than
      all, of the Class A-1 Certificates and the Class A-2 Certificates pro rata
      based on the Fractional Undivided Interest in the Class B Trust held by
      each such Class B Certificateholder and (B) if prior to the end of such
      ten-day period any other Class B Certificateholder fails to notify the
      purchasing Class B Certificateholder of such other Class B
      Certificateholder's desire to participate in such a purchase, then such
      other Class B Certificateholder shall lose its right to purchase the Class
      A-1 Certificates and the Class A-2 Certificates pursuant to this Section
      4.01(a)(iii); and

            (iv) each Class C Certificateholder shall have the right (which
      shall not expire upon any purchase of the Class A-1 Certificates or the
      Class A-2 Certificates pursuant to clause (i), (ii) or (iii) above) to
      purchase all, but not less than all, of the Class A-1 Certificates, the
      Class A-2 Certificates and the Class B Certificates upon ten days' prior
      written notice to the Trustee, the Class A-2 Trustee, the Class B Trustee
      and each other Class C Certificateholder, provided that (A) if prior to
      the end of such ten-day period any other Class C Certificateholder
      notifies such purchasing Class C Certificateholder that such other Class C
      Certificateholder wants to participate in such purchase, then such other
      Class C Certificateholder may join with the purchasing Class C
      Certificateholder to purchase all, but not less than all, of the Class A-1
      Certificates, the Class A-2 Certificates and the Class B Certificates pro
      rata based on the Fractional Undivided Interest in the Class C Trust held
      by each such Class C Certificateholder and (B) if prior to the end of such
      ten-day period any other Class C Certificateholder fails to notify the
      purchasing Class C Certificateholder of such other Class C
      Certificateholder's desire to participate in such a purchase, then such
      other Class C Certificateholder shall lose its right to purchase the Class
      A-1 Certificates, the Class A-2 Certificates and the Class B Certificates
      pursuant to this Section 4.01(a)(iv); and

            (v) each Class D Certificateholder (other than the Company or any of
      its Affiliates) shall have the right (which shall not expire upon any
      purchase of the Class A-1 Certificates, the Class A-2 Certificates or the
      Class B Certificates pursuant to clause (i), (ii), (iii) or (iv) above) to
      purchase all, but not less than all, of the Class A-1 Certificates, the
      Class A-2 Certificates, the Class B Certificates and the Class C
      Certificates upon ten days' prior written notice to the Trustee, the Class
      A-2 Trustee, the Class B Trustee, the Class C Trustee and each other Class
      D Certificateholder, provided that (A) if prior to the end of such ten-day
      period any other Class D Certificateholder (other than the Company or any
      of its Affiliates) notifies such purchasing Class D Certificateholder that
      such other Class D Certificateholder wants to participate in such
      purchase, then such other Class D Certificateholder may join with the
      purchasing Class D Certificateholder to purchase all, but not less than
      all, of the Class A-1 Certificates, the Class A-2 Certificates, the Class
      B Certificates and the Class C Certificates pro rata based on the
      Fractional Undivided Interest in the Class D Trust held by each such Class
      D Certificateholder and (B) if prior to the end of such ten-day period any
      other Class D Certificateholder fails to notify the purchasing Class D
      Certificateholder of such other Class D Certificateholder's desire to
      participate in such a purchase, then such other Class D Certificateholder
      shall lose its right to purchase the Class A-1 Certificates, the Class A-2
      Certificates, the Class B Certificates and the Class C Certificates
      pursuant to this Section 4.01(a)(v).

            The purchase price with respect to the Class A-1 Certificates shall
be equal to the Pool Balance of the Class A-1 Certificates, together with
accrued and unpaid interest in respect thereof to the date of such purchase,
without premium, but including any other amounts then due and payable to the
Class A-1 Certificateholders under this Agreement, the Intercreditor Agreement
or any Note Document or on or in respect of the Class A-1 Certificates;
provided, however, that if such purchase occurs after the Record Date relating
to any Distribution Date, such purchase price shall be reduced by the amount to
be distributed hereunder on such related Distribution Date (which deducted
amounts shall remain distributable to, and may be retained by, the Class A-1
Certificateholders as of such Record Date); provided, further that no such
purchase of Class A-1 Certificates pursuant to clause (iii), (iv) or (v) above
shall be effective unless the purchaser(s) shall certify to the Trustee that
contemporaneously with such purchase, such purchaser(s) is purchasing, pursuant
to the terms of this Agreement and the Intercreditor Agreement, all of the Class
A-1 Certificates, the Class A-2 Certificates, the Class B Certificates and the
Class C Certificates that are senior to the securities held by such
purchaser(s). Each payment of the purchase price of the Class A-1 Certificates
referred to in the first sentence hereof shall be made to an account or accounts
designated by the Trustee and each such purchase shall be subject to the terms
of this Section 4.01(a). Each Class A-1 Certificateholder agrees by its
acceptance of its Certificate that it will, upon payment from such Class A-2
Certificateholder(s), Class B Certificateholder(s), Class C Certificateholder(s)
or Class D Certificateholder(s), as the case may be, of the purchase price set
forth in the first sentence of this paragraph, forthwith sell, assign, transfer
and convey to the purchaser(s) thereof (without recourse, representation or
warranty of any kind except as to its own acts) all of the right, title,
interest and obligation of such Class A-1 Certificateholder in this Agreement,
the Intercreditor Agreement, the Liquidity Facility, the Note Documents and all
Class A-1 Certificates held by such Class A-1 Certificateholder (excluding all
right, title and interest under any of the foregoing to the extent such right,
title or interest is with respect to an obligation not then due and payable as
respects any action or inaction or state of affairs occurring prior to such
sale) and the purchaser(s) shall assume all of such Class A-1
Certificateholder's obligations under this Agreement, the Intercreditor
Agreement, the Liquidity Facility, the Note Documents and all such Class A-1
Certificates. The Class A-1 Certificates will be deemed to be purchased on the
date payment of the purchase price is made notwithstanding the failure of any
Class A-1 Certificateholder to deliver any Class A-1 Certificate and, upon such
a purchase, (i) the only rights of the Class A-1 Certificateholders will be to
deliver the Class A-1 Certificates and (ii) if the purchaser(s) shall so
request, each such Class A-1 Certificateholder will comply with all the
provisions of Section 3.04 of the Basic Agreement to enable new Class A-1
Certificates to be issued to the purchaser(s) in such denominations as it shall
request. All charges and expenses in connection with the issuance of any such
new Class A-1 Certificates shall be borne by the purchaser(s) thereof.

            As used in this Section 4.01(a), the terms "Class A-1
Certificateholder", "Class A-2 Certificate", "Class A-2 Certificateholder",
"Class A-2 Trust", "Class A-2 Trust Agreement", "Class A-2 Trustee", "Class B
Certificate", "Class B Certificateholder", "Class B Trust", "Class B Trustee",
"Class C Certificate", "Class C Certificateholder", "Class C Trust", "Class C
Trustee", "Class D Certificate", "Class D Certificateholder", "Class D Trust"
and "Class D Trustee" shall have the respective meanings assigned to such terms
in the Intercreditor Agreement.

            (b) This Section 4.01 supplements and, to the extent inconsistent
with any provision of Section 6.01(a) of the Basic Agreement, replaces the
provisions of Section 6.01(a) of the Basic Agreement. Notwithstanding anything
to the contrary set forth herein or in any Operative Agreement, the provisions
of this Section 4.01 may not be amended in any manner without the consent of
each Class A-1 Certificateholder, Class A-2 Certificateholder, Class B
Certificateholder, Class C Certificateholder or Class D Certificateholder (other
than the Company or any of its Affiliates) that would be adversely affected
thereby.

                                   ARTICLE V

                            MISCELLANEOUS PROVISIONS

            Section 5.01 Final Termination Date. The respective obligations and
responsibilities of the Company and the Trustee created hereby and the Class A-1
Trust created hereby shall terminate upon the distribution to all
Certificateholders of Class A-1 Certificates and the Trustee of all amounts
required to be distributed to them pursuant to this Agreement and the
disposition of all property held as part of the Trust Property; provided,
however, that in no event shall the Trust created hereby continue beyond the
expiration of 21 years from the death of the last survivor of the descendants of
Joseph P. Kennedy, Sr., the father of John F. Kennedy, former President of the
United States, living on the date of this Trust Supplement.

            Section 5.02 Basic Agreement Ratified. Except and so far as herein
expressly provided, all of the provisions, terms and conditions of the Basic
Agreement are in all respects ratified and confirmed; and the Basic Agreement
and this Trust Supplement shall be taken, read and construed as one and the same
instrument.

            Section 5.03 Governing Law. THIS AGREEMENT HAS BEEN DELIVERED IN THE
STATE OF NEW YORK AND THIS AGREEMENT AND THE CLASS A-1 CERTIFICATES SHALL BE
GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK,
INCLUDING ALL MATTERS OF CONSTRUCTION, VALIDITY AND PERFORMANCE, AND THE
OBLIGATIONS, RIGHTS AND REMEDIES OF THE PARTIES HEREUNDER AND THEREUNDER SHALL
BE DETERMINED IN ACCORDANCE WITH SUCH LAWS.

            Section 5.04 Counterparts. This Trust Supplement may be executed in
any number of counterparts (and each of the parties shall not be required to
execute the same counterpart). Each counterpart of this Trust Supplement
including a signature page or pages executed by each of the parties hereto shall
be an original counterpart of this Trust Supplement, but all of such
counterparts together shall constitute one instrument.

            Section 5.05 Intention of Parties. The parties hereto intend that
the Class A-1 Trust be classified for United States federal income tax purposes
as a grantor trust under Part 1E of Chapter 1J of Subtitle A of the Internal
Revenue Code of 1986, as amended, and not as a trust or association taxable as a
corporation or as a partnership. Each Certificateholder of a Class A-1
Certificate, by its acceptance of its Class A-1 Certificate or a beneficial
interest therein, agrees to treat the Class A-1 Trust as a grantor trust for all
United States federal, state and local income tax purposes. The Trustee shall
not be authorized or empowered to do anything that would cause the Class A-1
Trust to fail to qualify as a grantor trust for such tax purposes (including as
subject to this restriction, acquiring any Aircraft by bidding the Equipment
Notes relating thereto or otherwise, or taking any action with respect to any
such Aircraft once acquired).

<PAGE>

            IN WITNESS WHEREOF, the parties have caused this Trust Supplement to
be duly executed by their respective officers thereto duly authorized as of the
date first written above.

                                    DELTA AIR LINES, INC.

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

                                    STATE STREET BANK AND TRUST COMPANY OF
                                    CONNECTICUT, NATIONAL ASSOCIATION,
                                    as Trustee

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

<PAGE>

                                  EXHIBIT A to
                         TRUST SUPPLEMENT NO. 2001-1A-1

                               FORM OF CERTIFICATE

            *Unless this Certificate is presented by an authorized
representative of The Depository Trust Company, a New York corporation ("DTC"),
to Issuer or its agent for registration of transfer, exchange or payment, and
any Certificate issued is registered in the name of Cede & Co. or in such other
name as is requested by an authorized representative of DTC (and any payment is
made to Cede & Co. or to such other entity as is requested by an authorized
representative of DTC), ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR
OTHERWISE BY OR TO ANY PERSON IS WRONGFUL inasmuch as the registered owner
hereof, Cede & Co., has an interest herein.

               DELTA AIR LINES, INC. PASS THROUGH TRUST 2001-1A-1

        6.619% DELTA AIR LINES PASS THROUGH CERTIFICATE, SERIES 2001-1A-1

            Final Expected Regular Distribution Date: March 18, 2011

                  evidencing a fractional undivided interest
                  in a Trust, the property of which includes
                  or will include, among other things,
                  certain Equipment Notes each secured by an
                  Aircraft owned by Delta Air Lines, Inc.

Certificate No. ______   $____________ Fractional          CUSIP No. 247367AS4
                         Undivided Interest representing
                         [          ]% of the Trust per
                         $1,000 face amount

            THIS CERTIFIES THAT ________, for value received, is the registered
owner of a $______ (______ dollars) Fractional Undivided Interest in the Delta
Air Lines Pass Through Trust, Series 2001-1A-1 (the "Trust") created by STATE
STREET BANK AND TRUST COMPANY OF CONNECTICUT, NATIONAL ASSOCIATION, as trustee
(the "Trustee"), pursuant to a Pass Through Trust Agreement, dated as of
November 16, 2000 (the "Basic Agreement"), as supplemented by Trust Supplement
No. 2001-1A-1 thereto dated September __, 2001 (collectively, the "Agreement"),
between the Trustee and Delta Air Lines, Inc., a corporation incorporated under
Delaware law (the "Company"), a summary of certain of the pertinent provisions
of which is set forth below. To the extent not otherwise defined herein, the
capitalized terms used herein have the meanings assigned to them in the
Agreement. This Certificate is one of the duly authorized Certificates
designated as "6.619% Delta Air Lines Pass Through Certificates, Series
2001-1A-1" (herein called the "Certificates"). This Certificate is issued under
and is subject to the terms, provisions and conditions of the Agreement. By
virtue of its acceptance hereof, the Certificateholder of this Certificate
assents to and agrees to be bound by all of the provisions of the Agreement and
the Intercreditor Agreement, including the subordination provisions of Section
9.09 of the Intercreditor Agreement. The property of the Trust includes or will
include certain Equipment Notes and all rights of the Trust and the Trustee, on
behalf of the Trust, to receive any payments under the Intercreditor Agreement
or the Liquidity Facility (the "Trust Property"). Each issue of the Equipment
Notes is or will be secured by, among other things, a security interest in
certain Aircraft owned by the Company.

----------
*     This legend to appear on Book-Entry Certificates to be deposited with The
      Depository Trust Company.

            The Certificates represent Fractional Undivided Interests in the
Trust and the Trust Property, and will have no rights, benefits or interest in
respect of any other separate trust established pursuant to the terms of the
Basic Agreement for any other series of certificates issued pursuant thereto.

            Subject to and in accordance with the terms of the Agreement and the
Intercreditor Agreement, from funds then available to the Trustee, there will be
distributed on each March 18 and September 18 (a "Regular Distribution Date"),
commencing on March 18, 2002, to the Person in whose name this Certificate is
registered at the close of business on the 15th day preceding the Regular
Distribution Date, an amount in respect of the Scheduled Payments on the
Equipment Notes due on such Regular Distribution Date, the receipt of which has
been confirmed by the Trustee, equal to the product of the percentage interest
in the Trust evidenced by this Certificate and an amount equal to the sum of
such Scheduled Payments. Subject to and in accordance with the terms of the
Agreement and the Intercreditor Agreement, in the event that Special Payments on
the Equipment Notes are received by the Trustee, from funds then available to
the Trustee, there shall be distributed on the applicable Special Distribution
Date, to the Person in whose name this Certificate is registered at the close of
business on the 15th day preceding the Special Distribution Date, an amount in
respect of such Special Payments on the Equipment Notes, the receipt of which
has been confirmed by the Trustee, equal to the product of the percentage
interest in the Trust evidenced by this Certificate and an amount equal to the
sum of such Special Payments so received. If a Regular Distribution Date or
Special Distribution Date is not a Business Day, distribution shall be made on
the immediately following Business Day with the same force and effect as if made
on such Regular Distribution Date or Special Distribution Date and no interest
shall accrue during the intervening period. The Trustee shall mail notice of
each Special Payment and the Special Distribution Date therefor to the
Certificateholder of this Certificate.

            Distributions on this Certificate will be made by the Trustee by
check mailed to the Person entitled thereto, without the presentation or
surrender of this Certificate or the making of any notation hereon, except that
with respect to Certificates registered on the Record Date in the name of a
Clearing Agency (or its nominee), such distributions shall be made by wire
transfer. Except as otherwise provided in the Agreement and notwithstanding the
above, the final distribution on this Certificate will be made after notice
mailed by the Trustee of the pendency of such distribution and only upon
presentation and surrender of this Certificate at the office or agency of the
Trustee specified in such notice.

            The Certificates do not represent a direct obligation of, or an
obligation guaranteed by, or an interest in, the Company, the Trustee or any
Loan Trustee or any Affiliate thereof. The Certificates are limited in right of
payment, all as more specifically set forth on the face hereof and in the
Agreement. All payments or distributions made to Certificateholders under the
Agreement shall be made only from the Trust Property and only to the extent that
the Trustee shall have sufficient income or proceeds from the Trust Property to
make such payments in accordance with the terms of the Agreement. Each
Certificateholder of this Certificate, by its acceptance hereof, agrees that it
will look solely to the income and proceeds from the Trust Property to the
extent available for any payment or distribution to such Certificateholder
pursuant to the terms of the Agreement and that it will not have any recourse to
the Company, the Trustee or the Loan Trustees except as otherwise expressly
provided in the Agreement, in any Note Document or in the Intercreditor
Agreement. This Certificate does not purport to summarize the Agreement and
reference is made to the Agreement for information with respect to the
interests, rights, benefits, obligations, proceeds and duties evidenced hereby.
A copy of the Agreement may be examined during normal business hours at the
principal office of the Trustee, and at such other places, if any, designated by
the Trustee, by any Certificateholder upon request.

            The Agreement permits, with certain exceptions therein provided, the
amendment thereof and the modification of the rights and obligations of the
Company and the rights of the Certificateholders under the Agreement at any time
by the Company and the Trustee with the consent of the Certificateholders
holding Certificates evidencing Fractional Undivided Interests aggregating not
less than a majority in interest in the Trust. Any such consent by the
Certificateholder of this Certificate shall be conclusive and binding on such
Certificateholder and upon all future Certificateholders of this Certificate and
of any Certificate issued upon the transfer hereof or in exchange hereof or in
lieu hereof whether or not notation of such consent is made upon this
Certificate. The Agreement also permits the amendment thereof, in certain
limited circumstances, without the consent of the Certificateholders of any of
the Certificates.

            As provided in the Agreement and subject to certain limitations set
forth therein, the transfer of this Certificate is registrable in the Register
upon surrender of this Certificate for registration of transfer at the offices
or agencies maintained by the Trustee in its capacity as Registrar, or by any
successor Registrar duly endorsed or accompanied by a written instrument of
transfer in form satisfactory to the Trustee and the Registrar, duly executed by
the Certificateholder hereof or such Certificateholder's attorney duly
authorized in writing, and thereupon one or more new Certificates of authorized
denominations evidencing the same aggregate Fractional Undivided Interest in the
Trust will be issued to the designated transferee or transferees.

            The Certificates are issuable only as registered Certificates
without coupons in minimum denominations of $1,000 Fractional Undivided Interest
and integral multiples thereof except that one Certificate may be issued in a
different denomination. As provided in the Agreement and subject to certain
limitations therein set forth, the Certificates are exchangeable for new
Certificates of authorized denominations evidencing the same aggregate
Fractional Undivided Interest in the Trust, as requested by the
Certificateholder surrendering the same.

            No service charge will be made for any such registration of transfer
or exchange, but the Trustee shall require payment of a sum sufficient to cover
any tax or governmental charge payable in connection therewith.

            The Company, the Trustee, the Registrar and any Paying Agent shall
deem and treat the person in whose name this Certificate is registered as the
owner hereof for all purposes, and none of the Company, the Trustee, the
Registrar or any such agent shall be affected by any notice to the contrary.

            The obligations and responsibilities created by the Agreement and
the Trust created thereby shall terminate upon the distribution to
Certificateholders of all amounts required to be distributed to them pursuant to
the Agreement and the disposition of all property held as part of the Trust
Property.

            Any Person acquiring or accepting this Certificate or an interest
herein will, by such acquisition or acceptance, be deemed to represent and
warrant to the Company, the Loan Trustees and the Trustee that either: (i) no
assets of an employee benefit plan subject to Title I of the Employee Retirement
Income Security Act of 1974, as amended ("ERISA"), or of an employee benefit
plan or an individual retirement account subject to Section 4975 of the Internal
Revenue Code of 1986, as amended (the "Code"), or any trust established under
such plan or account, have been used to purchase this Certificate or an interest
herein or (ii) the purchase and holding of this Certificate or interest herein
by such Person are exempt from the prohibited transaction restrictions of ERISA
and the Code pursuant to one or more prohibited transaction statutory or
administrative exemptions.

            THIS CERTIFICATE AND THE AGREEMENT SHALL BE GOVERNED BY AND
CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK, INCLUDING ALL
MATTERS OF CONSTRUCTION, VALIDITY AND PERFORMANCE, AND THE OBLIGATIONS, RIGHTS
AND REMEDIES OF THE PARTIES AND CERTIFICATEHOLDERS HEREUNDER AND THEREUNDER
SHALL BE DETERMINED IN ACCORDANCE WITH SUCH LAWS.

            Unless the certificate of authentication hereon has been executed by
the Trustee, by manual signature, this Certificate shall not be entitled to any
benefit under the Agreement or be valid for any purpose.

<PAGE>

            IN WITNESS WHEREOF, the Trustee has caused this Certificate to be
duly executed.

                                    DELTA AIR LINES, INC. PASS THROUGH TRUST
                                    2001-1A-1

                                    By:  STATE STREET BANK AND TRUST COMPANY
                                         OF CONNECTICUT, NATIONAL
                                         ASSOCIATION,
                                         as Trustee

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

Dated:

               FORM OF THE TRUSTEE'S CERTIFICATE OF AUTHENTICATION

            This is one of the Certificates referred to in the within-mentioned
Agreement.

                                    STATE STREET BANK AND TRUST COMPANY OF
                                    CONNECTICUT, NATIONAL ASSOCIATION,
                                    as Trustee

                                    By:
                                         -------------------------------
                                         Authorized Officer

<PAGE>

                                  EXHIBIT B to
                         TRUST SUPPLEMENT NO. 2001-1A-1

                         [DTC Letter of Representations]

                            [Intentionally Omitted]

<PAGE>

                                     N687DL

                                   ----------

                                 SCHEDULE 1-A to
                         TRUST SUPPLEMENT NO. 2001-1A-1

                                 EQUIPMENT NOTE
                               PRINCIPAL PAYMENTS

                                             SCHEDULED PRINCIPAL
                     PAYMENT DATE                  PAYMENTS
                  ------------------         -------------------

                  March 18, 2002                  $976,339.79
                  September 18, 2002                     0.00
                  March 18, 2003                   976,707.23
                  September 18, 2003                     0.00
                  March 18, 2004                   976,707.23
                  September 18, 2004                     0.00
                  March 18, 2005                   976,707.23
                  September 18, 2005                     0.00
                  March 18, 2006                   976,707.23
                  September 18, 2006                     0.00
                  March 18, 2007                         0.00
                  September 18, 2007                     0.00
                  March 18, 2008                    32,422.66
                  September 18, 2008                     0.00
                  March 18, 2009                   881,852.51
                  September 18, 2009                     0.00
                  March 18, 2010                   881,852.50
                  September 18, 2010                     0.00
                  March 18, 2011                 1,399,897.92
                  September 18, 2011                     0.00

<PAGE>

                                     N688DL

                                   ----------

                                 SCHEDULE 1-A to
                         TRUST SUPPLEMENT NO. 2001-1A-1

                                 EQUIPMENT NOTE
                               PRINCIPAL PAYMENTS

                                             SCHEDULED PRINCIPAL
                     PAYMENT DATE                  PAYMENTS
                  ------------------         -------------------

                  March 18, 2002                  $976,339.79
                  September 18, 2002                     0.00
                  March 18, 2003                   976,707.23
                  September 18, 2003                     0.00
                  March 18, 2004                   976,707.23
                  September 18, 2004                     0.00
                  March 18, 2005                   976,707.23
                  September 18, 2005                     0.00
                  March 18, 2006                   976,707.23
                  September 18, 2006                     0.00
                  March 18, 2007                         0.00
                  September 18, 2007                     0.00
                  March 18, 2008                    32,422.66
                  September 18, 2008                     0.00
                  March 18, 2009                   881,852.51
                  September 18, 2009                     0.00
                  March 18, 2010                   881,852.50
                  September 18, 2010                     0.00
                  March 18, 2011                 1,399,897.92
                  September 18, 2011                     0.00

<PAGE>

                                     N689DL

                                   ----------

                                 SCHEDULE 1-A to
                         TRUST SUPPLEMENT NO. 2001-1A-1

                                 EQUIPMENT NOTE
                               PRINCIPAL PAYMENTS

                                             SCHEDULED PRINCIPAL
                     PAYMENT DATE                  PAYMENTS
                  ------------------         -------------------

                  March 18, 2002                  $978,730.67
                  September 18, 2002                     0.00
                  March 18, 2003                   979,099.00
                  September 18, 2003                     0.00
                  March 18, 2004                   979,099.00
                  September 18, 2004                     0.00
                  March 18, 2005                   979,099.00
                  September 18, 2005                     0.00
                  March 18, 2006                   979,099.00
                  September 18, 2006                     0.00
                  March 18, 2007                         0.00
                  September 18, 2007                     0.00
                  March 18, 2008                    32,502.07
                  September 18, 2008                     0.00
                  March 18, 2009                   884,011.99
                  September 18, 2009                     0.00
                  March 18, 2010                   884,012.00
                  September 18, 2010                     0.00
                  March 18, 2011                 1,403,326.00
                  September 18, 2011                     0.00

<PAGE>

                                     N690DL

                                   ----------

                                 SCHEDULE 1-A to
                         TRUST SUPPLEMENT NO. 2001-1A-1

                                 EQUIPMENT NOTE
                               PRINCIPAL PAYMENTS

                                             SCHEDULED PRINCIPAL
                     PAYMENT DATE                  PAYMENTS
                  ------------------         -------------------

                  March 18, 2002                        $0.00
                  September 18, 2002               978,730.67
                  March 18, 2003                         0.00
                  September 18, 2003               979,099.00
                  March 18, 2004                         0.00
                  September 18, 2004               979,099.00
                  March 18, 2005                         0.00
                  September 18, 2005               979,099.00
                  March 18, 2006                         0.00
                  September 18, 2006                     0.00
                  March 18, 2007                         0.00
                  September 18, 2007               184,599.41
                  March 18, 2008                         0.00
                  September 18, 2008               827,001.66
                  March 18, 2009                         0.00
                  September 18, 2009               884,011.99
                  March 18, 2010                         0.00
                  September 18, 2010               884,012.00
                  March 18, 2011                   774,719.79
                  September 18, 2011                     0.00

<PAGE>

                                     N692DL

                                   ----------

                                 SCHEDULE 1-A to
                         TRUST SUPPLEMENT NO. 2001-1A-1

                                 EQUIPMENT NOTE
                               PRINCIPAL PAYMENTS

                                             SCHEDULED PRINCIPAL
                     PAYMENT DATE                  PAYMENTS
                  ------------------         -------------------

                  March 18, 2002                        $0.00
                  September 18, 2002               986,235.35
                  March 18, 2003                         0.00
                  September 18, 2003               986,606.52
                  March 18, 2004                         0.00
                  September 18, 2004               986,606.51
                  March 18, 2005                         0.00
                  September 18, 2005               986,606.51
                  March 18, 2006                         0.00
                  September 18, 2006                     0.00
                  March 18, 2007                         0.00
                  September 18, 2007               186,014.88
                  March 18, 2008                         0.00
                  September 18, 2008               833,342.92
                  March 18, 2009                         0.00
                  September 18, 2009               890,790.40
                  March 18, 2010                         0.00
                  September 18, 2010               890,790.40
                  March 18, 2011                   780,660.17
                  September 18, 2011                     0.00

<PAGE>

                                     N693DL

                                   ----------

                                 SCHEDULE 1-A to
                         TRUST SUPPLEMENT NO. 2001-1A-1

                                 EQUIPMENT NOTE
                               PRINCIPAL PAYMENTS

                                             SCHEDULED PRINCIPAL
                     PAYMENT DATE                  PAYMENTS
                  ------------------         -------------------

                  March 18, 2002                        $0.00
                  September 18, 2002               988,626.23
                  March 18, 2003                         0.00
                  September 18, 2003               988,998.28
                  March 18, 2004                         0.00
                  September 18, 2004               988,998.29
                  March 18, 2005                         0.00
                  September 18, 2005               988,998.28
                  March 18, 2006                         0.00
                  September 18, 2006                     0.00
                  March 18, 2007                         0.00
                  September 18, 2007               186,465.82
                  March 18, 2008                         0.00
                  September 18, 2008               835,363.15
                  March 18, 2009                         0.00
                  September 18, 2009               892,949.89
                  March 18, 2010                         0.00
                  September 18, 2010               892,949.90
                  March 18, 2011                   782,552.68
                  September 18, 2011                     0.00

<PAGE>

                                     N694DL

                                   ----------

                                 SCHEDULE 1-A to
                         TRUST SUPPLEMENT NO. 2001-1A-1

                                 EQUIPMENT NOTE
                               PRINCIPAL PAYMENTS

                                             SCHEDULED PRINCIPAL
                     PAYMENT DATE                  PAYMENTS
                  ------------------         -------------------

                  March 18, 2002                        $0.00
                  September 18, 2002               991,349.17
                  March 18, 2003                         0.00
                  September 18, 2003               991,722.25
                  March 18, 2004                         0.00
                  September 18, 2004               991,722.25
                  March 18, 2005                         0.00
                  September 18, 2005               991,722.25
                  March 18, 2006                         0.00
                  September 18, 2006                     0.00
                  March 18, 2007                         0.00
                  September 18, 2007               186,979.40
                  March 18, 2008                         0.00
                  September 18, 2008               837,663.95
                  March 18, 2009                         0.00
                  September 18, 2009               895,409.32
                  March 18, 2010                         0.00
                  September 18, 2010               895,409.31
                  March 18, 2011                   784,708.04
                  September 18, 2011                     0.00

<PAGE>

                                     N695DL

                                   ----------

                                 SCHEDULE 1-A to
                         TRUST SUPPLEMENT NO. 2001-1A-1

                                 EQUIPMENT NOTE
                               PRINCIPAL PAYMENTS

                                             SCHEDULED PRINCIPAL
                     PAYMENT DATE                  PAYMENTS
                  ------------------         -------------------

                  March 18, 2002                        $0.00
                  September 18, 2002               994,138.52
                  March 18, 2003                         0.00
                  September 18, 2003               994,512.65
                  March 18, 2004                         0.00
                  September 18, 2004               994,512.65
                  March 18, 2005                         0.00
                  September 18, 2005               994,512.66
                  March 18, 2006                         0.00
                  September 18, 2006                     0.00
                  March 18, 2007                         0.00
                  September 18, 2007               187,505.50
                  March 18, 2008                         0.00
                  September 18, 2008               840,020.88
                  March 18, 2009                         0.00
                  September 18, 2009               897,928.72
                  March 18, 2010                         0.00
                  September 18, 2010               897,928.73
                  March 18, 2011                   786,915.96
                  September 18, 2011                     0.00

<PAGE>

                                     N6714Q

                                   ----------

                                 SCHEDULE 1-A to
                         TRUST SUPPLEMENT NO. 2001-1A-1

                                 EQUIPMENT NOTE
                               PRINCIPAL PAYMENTS

                                             SCHEDULED PRINCIPAL
                     PAYMENT DATE                  PAYMENTS
                  ------------------         -------------------

                  March 18, 2002                $1,078,784.42
                  September 18, 2002                     0.00
                  March 18, 2003                 1,079,192.62
                  September 18, 2003                     0.00
                  March 18, 2004                 1,079,192.62
                  September 18, 2004                     0.00
                  March 18, 2005                 1,079,192.62
                  September 18, 2005                     0.00
                  March 18, 2006                 1,079,192.62
                  September 18, 2006                     0.00
                  March 18, 2007                         0.00
                  September 18, 2007                     0.00
                  March 18, 2008                    28,263.42
                  September 18, 2008                     0.00
                  March 18, 2009                   974,284.84
                  September 18, 2009                     0.00
                  March 18, 2010                   974,384.84
                  September 18, 2010                     0.00
                  March 18, 2011                 1,565,230.72
                  September 18, 2011                     0.00

<PAGE>

                                     N6715C

                                   ----------

                                 SCHEDULE 1-A to
                         TRUST SUPPLEMENT NO. 2001-1A-1

                                 EQUIPMENT NOTE
                               PRINCIPAL PAYMENTS

                                             SCHEDULED PRINCIPAL
                     PAYMENT DATE                  PAYMENTS
                  ------------------         -------------------

                  March 18, 2002                $1,089,901.98
                  September 18, 2002                     0.00
                  March 18, 2003                 1,090,315.50
                  September 18, 2003                     0.00
                  March 18, 2004                 1,090,315.50
                  September 18, 2004                     0.00
                  March 18, 2005                 1,090,315.50
                  September 18, 2005                     0.00
                  March 18, 2006                 1,090,315.50
                  September 18, 2006                     0.00
                  March 18, 2007                         0.00
                  September 18, 2007                     0.00
                  March 18, 2008                    24,735.08
                  September 18, 2008                     0.00
                  March 18, 2009                   984,427.50
                  September 18, 2009                     0.00
                  March 18, 2010                   984,427.50
                  September 18, 2010                     0.00
                  March 18, 2011                 1,590,679.18
                  September 18, 2011                     0.00

<PAGE>

                                     N6716C

                                   ----------

                                 SCHEDULE 1-A to
                         TRUST SUPPLEMENT NO. 2001-1A-1

                                 EQUIPMENT NOTE
                               PRINCIPAL PAYMENTS

                                             SCHEDULED PRINCIPAL
                     PAYMENT DATE                  PAYMENTS
                  ------------------         -------------------

                  March 18, 2002                $1,090,890.10
                  September 18, 2002                     0.00
                  March 18, 2003                 1,091,304.00
                  September 18, 2003                     0.00
                  March 18, 2004                 1,091,304.00
                  September 18, 2004                     0.00
                  March 18, 2005                 1,091,304.00
                  September 18, 2005                     0.00
                  March 18, 2006                 1,091,304.00
                  September 18, 2006                     0.00
                  March 18, 2007                         0.00
                  September 18, 2007                     0.00
                  March 18, 2008                    24,757.51
                  September 18, 2008                     0.00
                  March 18, 2009                   985,320.00
                  September 18, 2009                     0.00
                  March 18, 2010                   985,320.00
                  September 18, 2010                     0.00
                  March 18, 2011                 1,592,121.32
                  September 18, 2011                     0.00

<PAGE>

                                     N169DZ

                                   ----------

                                 SCHEDULE 1-A to
                         TRUST SUPPLEMENT NO. 2001-1A-1

                                 EQUIPMENT NOTE
                               PRINCIPAL PAYMENTS

                                             SCHEDULED PRINCIPAL
                     PAYMENT DATE                  PAYMENTS
                  ------------------         -------------------

                  March 18, 2002                $1,477,891.95
                  September 18, 2002                     0.00
                  March 18, 2003                 1,478,448.13
                  September 18, 2003                     0.00
                  March 18, 2004                 1,478,448.13
                  September 18, 2004                     0.00
                  March 18, 2005                 1,478,448.13
                  September 18, 2005                     0.00
                  March 18, 2006                 1,478,448.13
                  September 18, 2006                     0.00
                  March 18, 2007                         0.00
                  September 18, 2007                     0.00
                  March 18, 2008                    49,078.39
                  September 18, 2008                     0.00
                  March 18, 2009                 1,334,865.91
                  September 18, 2009                     0.00
                  March 18, 2010                 1,334,865.92
                  September 18, 2010                     0.00
                  March 18, 2011                 2,119,034.64
                  September 18, 2011                     0.00

<PAGE>

                                     N171DZ

                                   ----------

                                 SCHEDULE 1-A to
                         TRUST SUPPLEMENT NO. 2001-1A-1

                                 EQUIPMENT NOTE
                               PRINCIPAL PAYMENTS

                                             SCHEDULED PRINCIPAL
                     PAYMENT DATE                  PAYMENTS
                  ------------------         -------------------

                  March 18, 2002                        $0.00
                  September 18, 2002             1,488,119.56
                  March 18, 2003                         0.00
                  September 18, 2003             1,488,679.61
                  March 18, 2004                         0.00
                  September 18, 2004             1,488,679.60
                  March 18, 2005                         0.00
                  September 18, 2005             1,488,679.61
                  March 18, 2006                         0.00
                  September 18, 2006                     0.00
                  March 18, 2007                         0.00
                  September 18, 2007               280,675.78
                  March 18, 2008                         0.00
                  September 18, 2008             1,257,421.87
                  March 18, 2009                         0.00
                  September 18, 2009             1,344,103.74
                  March 18, 2010                         0.00
                  September 18, 2010             1,344,103.74
                  March 18, 2011                 1,177,929.46
                  September 18, 2011                     0.00

<PAGE>

                                     N172DZ

                                   ----------

                                 SCHEDULE 1-A to
                         TRUST SUPPLEMENT NO. 2001-1A-1

                                 EQUIPMENT NOTE
                               PRINCIPAL PAYMENTS

                                             SCHEDULED PRINCIPAL
                     PAYMENT DATE                  PAYMENTS
                  ------------------         -------------------

                  March 18, 2002                        $0.00
                  September 18, 2002             1,488,119.56
                  March 18, 2003                         0.00
                  September 18, 2003             1,488,679.61
                  March 18, 2004                         0.00
                  September 18, 2004             1,488,679.60
                  March 18, 2005                         0.00
                  September 18, 2005             1,488,679.61
                  March 18, 2006                         0.00
                  September 18, 2006                     0.00
                  March 18, 2007                         0.00
                  September 18, 2007               280,675.78
                  March 18, 2008                         0.00
                  September 18, 2008             1,257,421.87
                  March 18, 2009                         0.00
                  September 18, 2009             1,344,103.74
                  March 18, 2010                         0.00
                  September 18, 2010             1,344,103.74
                  March 18, 2011                 1,177,929.46
                  September 18, 2011                     0.00

<PAGE>

                                     N173DZ

                                   ----------

                                 SCHEDULE 1-A to
                         TRUST SUPPLEMENT NO. 2001-1A-1

                                 EQUIPMENT NOTE
                               PRINCIPAL PAYMENTS

                                             SCHEDULED PRINCIPAL
                     PAYMENT DATE                  PAYMENTS
                  ------------------         -------------------

                  March 18, 2002                        $0.00
                  September 18, 2002             1,496,089.14
                  March 18, 2003                         0.00
                  September 18, 2003             1,496,652.19
                  March 18, 2004                         0.00
                  September 18, 2004             1,496,652.18
                  March 18, 2005                         0.00
                  September 18, 2005             1,496,652.18
                  March 18, 2006                         0.00
                  September 18, 2006                     0.00
                  March 18, 2007                         0.00
                  September 18, 2007               282,178.93
                  March 18, 2008                         0.00
                  September 18, 2008             1,264,155.96
                  March 18, 2009                         0.00
                  September 18, 2009             1,351,302.04
                  March 18, 2010                         0.00
                  September 18, 2010             1,351,302.05
                  March 18, 2011                 1,184,237.82
                  September 18, 2011                     0.00

<PAGE>

                                      N1608

                                   ----------

                                 SCHEDULE 1-A to
                         TRUST SUPPLEMENT NO. 2001-1A-1

                                 EQUIPMENT NOTE
                               PRINCIPAL PAYMENTS

                                             SCHEDULED PRINCIPAL
                     PAYMENT DATE                  PAYMENTS
                  ------------------         -------------------

                  March 18, 2002                $1,608,070.46
                  September 18, 2002                     0.00
                  March 18, 2003                 1,608,678.94
                  September 18, 2003                     0.00
                  March 18, 2004                 1,608,678.93
                  September 18, 2004                     0.00
                  March 18, 2005                 1,608,678.93
                  September 18, 2005                     0.00
                  March 18, 2006                 1,608,678.94
                  September 18, 2006                     0.00
                  March 18, 2007                         0.00
                  September 18, 2007                     0.00
                  March 18, 2008                    42,130.35
                  September 18, 2008                     0.00
                  March 18, 2009                 1,452,449.11
                  September 18, 2009                     0.00
                  March 18, 2010                 1,452,449.11
                  September 18, 2010                     0.00
                  March 18, 2011                 2,333,182.82
                  September 18, 2011                     0.00

<PAGE>

                                      N1609

                                   ----------

                                 SCHEDULE 1-A to
                         TRUST SUPPLEMENT NO. 2001-1A-1

                                 EQUIPMENT NOTE
                               PRINCIPAL PAYMENTS

                                             SCHEDULED PRINCIPAL
                     PAYMENT DATE                  PAYMENTS
                  ------------------         -------------------

                  March 18, 2002                $1,608,070.46
                  September 18, 2002                     0.00
                  March 18, 2003                 1,608,678.94
                  September 18, 2003                     0.00
                  March 18, 2004                 1,608,678.93
                  September 18, 2004                     0.00
                  March 18, 2005                 1,608,678.93
                  September 18, 2005                     0.00
                  March 18, 2006                 1,608,678.94
                  September 18, 2006                     0.00
                  March 18, 2007                         0.00
                  September 18, 2007                     0.00
                  March 18, 2008                    42,130.35
                  September 18, 2008                     0.00
                  March 18, 2009                 1,452,449.11
                  September 18, 2009                     0.00
                  March 18, 2010                 1,452,449.11
                  September 18, 2010                     0.00
                  March 18, 2011                 2,333,182.82
                  September 18, 2011                     0.00

<PAGE>

                                     N1610D

                                   ----------

                                 SCHEDULE 1-A to
                         TRUST SUPPLEMENT NO. 2001-1A-1

                                 EQUIPMENT NOTE
                               PRINCIPAL PAYMENTS

                                             SCHEDULED PRINCIPAL
                     PAYMENT DATE                  PAYMENTS
                  ------------------         -------------------

                  March 18, 2002                $1,608,070.46
                  September 18, 2002                     0.00
                  March 18, 2003                 1,608,678.94
                  September 18, 2003                     0.00
                  March 18, 2004                 1,608,678.93
                  September 18, 2004                     0.00
                  March 18, 2005                 1,608,678.93
                  September 18, 2005                     0.00
                  March 18, 2006                 1,608,678.94
                  September 18, 2006                     0.00
                  March 18, 2007                         0.00
                  September 18, 2007                     0.00
                  March 18, 2008                    42,130.35
                  September 18, 2008                     0.00
                  March 18, 2009                 1,452,449.11
                  September 18, 2009                     0.00
                  March 18, 2010                 1,452,449.11
                  September 18, 2010                     0.00
                  March 18, 2011                 2,333,182.82
                  September 18, 2011                     0.00

<PAGE>

                                     N3731T

                                   ----------

                                 SCHEDULE 1-A to
                         TRUST SUPPLEMENT NO. 2001-1A-1

                                 EQUIPMENT NOTE
                               PRINCIPAL PAYMENTS

                                             SCHEDULED PRINCIPAL
                     PAYMENT DATE                  PAYMENTS
                  ------------------         -------------------

                  March 18, 2002                        $0.00
                  September 18, 2002               862,327.37
                  March 18, 2003                         0.00
                  September 18, 2003                862,653.7
                  March 18, 2004                         0.00
                  September 18, 2004               862,653.66
                  March 18, 2005                         0.00
                  September 18, 2005               862,653.67
                  March 18, 2006                         0.00
                  September 18, 2006                     0.00
                  March 18, 2007                         0.00
                  September 18, 2007               162,646.56
                  March 18, 2008                         0.00
                  September 18, 2008               722,599.50
                  March 18, 2009                         0.00
                  September 18, 2009               778,875.46
                  March 18, 2010                         0.00
                  September 18, 2010               778,875.47
                  March 18, 2011                   697,323.31
                  September 18, 2011                     0.00

<PAGE>

                                     N3732J

                                   ----------

                                 SCHEDULE 1-A to
                         TRUST SUPPLEMENT NO. 2001-1A-1

                                 EQUIPMENT NOTE
                               PRINCIPAL PAYMENTS

                                             SCHEDULED PRINCIPAL
                     PAYMENT DATE                  PAYMENTS
                  ------------------         -------------------

                  March 18, 2002                        $0.00
                  September 18, 2002               864,573.19
                  March 18, 2003                         0.00
                  September 18, 2003               864,900.33
                  March 18, 2004                         0.00
                  September 18, 2004               864,900.33
                  March 18, 2005                         0.00
                  September 18, 2005               864,900.33
                  March 18, 2006                         0.00
                  September 18, 2006                     0.00
                  March 18, 2007                         0.00
                  September 18, 2007               163,070.15
                  March 18, 2008                         0.00
                  September 18, 2008               724,481.41
                  March 18, 2009                         0.00
                  September 18, 2009               780,903.95
                  March 18, 2010                         0.00
                  September 18, 2010               780,903.94
                  March 18, 2011                   699,139.39
                  September 18, 2011                     0.00

<PAGE>

                                     N3733Z

                                   ----------

                                 SCHEDULE 1-A to
                         TRUST SUPPLEMENT NO. 2001-1A-1

                                 EQUIPMENT NOTE
                               PRINCIPAL PAYMENTS

                                             SCHEDULED PRINCIPAL
                     PAYMENT DATE                  PAYMENTS
                  ------------------         -------------------

                  March 18, 2002                        $0.00
                  September 18, 2002               864,573.19
                  March 18, 2003                         0.00
                  September 18, 2003               864,900.33
                  March 18, 2004                         0.00
                  September 18, 2004               864,900.33
                  March 18, 2005                         0.00
                  September 18, 2005               864,900.33
                  March 18, 2006                         0.00
                  September 18, 2006                     0.00
                  March 18, 2007                         0.00
                  September 18, 2007               163,070.15
                  March 18, 2008                         0.00
                  September 18, 2008               724,481.41
                  March 18, 2009                         0.00
                  September 18, 2009               780,903.95
                  March 18, 2010                         0.00
                  September 18, 2010               780,903.94
                  March 18, 2011                   699,139.39
                  September 18, 2011                     0.00

<PAGE>

                                     N3734B

                                   ----------

                                 SCHEDULE 1-A to
                         TRUST SUPPLEMENT NO. 2001-1A-1

                                 EQUIPMENT NOTE
                               PRINCIPAL PAYMENTS

                                             SCHEDULED PRINCIPAL
                     PAYMENT DATE                  PAYMENTS
                  ------------------         -------------------

                  March 18, 2002                        $0.00
                  September 18, 2002               864,573.19
                  March 18, 2003                         0.00
                  September 18, 2003               864,900.33
                  March 18, 2004                         0.00
                  September 18, 2004               864,900.33
                  March 18, 2005                         0.00
                  September 18, 2005               864,900.33
                  March 18, 2006                         0.00
                  September 18, 2006                     0.00
                  March 18, 2007                         0.00
                  September 18, 2007               163,070.15
                  March 18, 2008                         0.00
                  September 18, 2008               724,481.41
                  March 18, 2009                         0.00
                  September 18, 2009               780,903.95
                  March 18, 2010                         0.00
                  September 18, 2010               780,903.94
                  March 18, 2011                   699,139.39
                  September 18, 2011                     0.00

<PAGE>

                                     N3735D

                                   ----------

                                 SCHEDULE 1-A to
                         TRUST SUPPLEMENT NO. 2001-1A-1

                                 EQUIPMENT NOTE
                               PRINCIPAL PAYMENTS

                                             SCHEDULED PRINCIPAL
                     PAYMENT DATE                  PAYMENTS
                  ------------------         -------------------

                  March 18, 2002                        $0.00
                  September 18, 2002               865,563.99
                  March 18, 2003                         0.00
                  September 18, 2003               865,891.50
                  March 18, 2004                         0.00
                  September 18, 2004               865,891.51
                  March 18, 2005                         0.00
                  September 18, 2005               865,891.51
                  March 18, 2006                         0.00
                  September 18, 2006                     0.00
                  March 18, 2007                         0.00
                  September 18, 2007               163,257.03
                  March 18, 2008                         0.00
                  September 18, 2008               725,311.67
                  March 18, 2009                         0.00
                  September 18, 2009               781,798.86
                  March 18, 2010                         0.00
                  September 18, 2010               781,798.85
                  March 18, 2011                   699,940.62
                  September 18, 2011                     0.00

<PAGE>

                                     N3736C

                                   ----------

                                 SCHEDULE 1-A to
                         TRUST SUPPLEMENT NO. 2001-1A-1

                                 EQUIPMENT NOTE
                               PRINCIPAL PAYMENTS

                                             SCHEDULED PRINCIPAL
                     PAYMENT DATE                  PAYMENTS
                  ------------------         -------------------

                  March 18, 2002                        $0.00
                  September 18, 2002               865,563.99
                  March 18, 2003                         0.00
                  September 18, 2003               865,891.50
                  March 18, 2004                         0.00
                  September 18, 2004               865,891.51
                  March 18, 2005                         0.00
                  September 18, 2005               865,891.51
                  March 18, 2006                         0.00
                  September 18, 2006                     0.00
                  March 18, 2007                         0.00
                  September 18, 2007               163,257.03
                  March 18, 2008                         0.00
                  September 18, 2008               725,311.67
                  March 18, 2009                         0.00
                  September 18, 2009               781,798.86
                  March 18, 2010                         0.00
                  September 18, 2010               781,798.85
                  March 18, 2011                   699,940.62
                  September 18, 2011                     0.00

<PAGE>

                                     N3737C

                                   ----------

                                 SCHEDULE 1-A to
                         TRUST SUPPLEMENT NO. 2001-1A-1

                                 EQUIPMENT NOTE
                               PRINCIPAL PAYMENTS

                                             SCHEDULED PRINCIPAL
                     PAYMENT DATE                  PAYMENTS
                  ------------------         -------------------

                  March 18, 2002                        $0.00
                  September 18, 2002               865,563.99
                  March 18, 2003                         0.00
                  September 18, 2003               865,891.50
                  March 18, 2004                         0.00
                  September 18, 2004               865,891.51
                  March 18, 2005                         0.00
                  September 18, 2005               865,891.51
                  March 18, 2006                         0.00
                  September 18, 2006                     0.00
                  March 18, 2007                         0.00
                  September 18, 2007               163,257.03
                  March 18, 2008                         0.00
                  September 18, 2008               725,311.67
                  March 18, 2009                         0.00
                  September 18, 2009               781,798.86
                  March 18, 2010                         0.00
                  September 18, 2010               781,798.85
                  March 18, 2011                   699,940.62
                  September 18, 2011                     0.00

<PAGE>

                                     N3738B

                                   ----------

                                 SCHEDULE 1-A to
                         TRUST SUPPLEMENT NO. 2001-1A-1

                                 EQUIPMENT NOTE
                               PRINCIPAL PAYMENTS

                                             SCHEDULED PRINCIPAL
                     PAYMENT DATE                  PAYMENTS
                  ------------------         -------------------

                  March 18, 2002                        $0.00
                  September 18, 2002               865,563.99
                  March 18, 2003                         0.00
                  September 18, 2003               865,891.50
                  March 18, 2004                         0.00
                  September 18, 2004               865,891.51
                  March 18, 2005                         0.00
                  September 18, 2005               865,891.51
                  March 18, 2006                         0.00
                  September 18, 2006                     0.00
                  March 18, 2007                         0.00
                  September 18, 2007               163,257.03
                  March 18, 2008                         0.00
                  September 18, 2008               725,311.67
                  March 18, 2009                         0.00
                  September 18, 2009               781,798.86
                  March 18, 2010                         0.00
                  September 18, 2010               781,798.85
                  March 18, 2011                   699,940.62
                  September 18, 2011                     0.00

<PAGE>

                                     N3739P

                                   ----------

                                 SCHEDULE 1-A to
                         TRUST SUPPLEMENT NO. 2001-1A-1

                                 EQUIPMENT NOTE
                               PRINCIPAL PAYMENTS

                                             SCHEDULED PRINCIPAL
                     PAYMENT DATE                  PAYMENTS
                  ------------------         -------------------

                  March 18, 2002                        $0.00
                  September 18, 2002               865,563.99
                  March 18, 2003                         0.00
                  September 18, 2003               865,891.50
                  March 18, 2004                         0.00
                  September 18, 2004               865,891.51
                  March 18, 2005                         0.00
                  September 18, 2005               865,891.51
                  March 18, 2006                         0.00
                  September 18, 2006                     0.00
                  March 18, 2007                         0.00
                  September 18, 2007               163,257.03
                  March 18, 2008                         0.00
                  September 18, 2008               725,311.67
                  March 18, 2009                         0.00
                  September 18, 2009               781,798.86
                  March 18, 2010                         0.00
                  September 18, 2010               781,798.85
                  March 18, 2011                   699,940.62
                  September 18, 2011                     0.00

<PAGE>

                                     N3740C

                                   ----------

                                 SCHEDULE 1-A to
                         TRUST SUPPLEMENT NO. 2001-1A-1

                                 EQUIPMENT NOTE
                               PRINCIPAL PAYMENTS

                                             SCHEDULED PRINCIPAL
                     PAYMENT DATE                  PAYMENTS
                  ------------------         -------------------

                  March 18, 2002                  $865,563.99
                  September 18, 2002                     0.00
                  March 18, 2003                   865,891.50
                  September 18, 2003                     0.00
                  March 18, 2004                   865,891.51
                  September 18, 2004                     0.00
                  March 18, 2005                   865,891.51
                  September 18, 2005                     0.00
                  March 18, 2006                   865,891.51
                  September 18, 2006                     0.00
                  March 18, 2007                         0.00
                  September 18, 2007                     0.00
                  March 18, 2008                    22,677.19
                  September 18, 2008                     0.00
                  March 18, 2009                   781,798.86
                  September 18, 2009                     0.00
                  March 18, 2010                   781,798.85
                  September 18, 2010                     0.00
                  March 18, 2011                 1,255,864.76
                  September 18, 2011                     0.00

<PAGE>

                                     N3741S

                                   ----------

                                 SCHEDULE 1-A to
                         TRUST SUPPLEMENT NO. 2001-1A-1

                                 EQUIPMENT NOTE
                               PRINCIPAL PAYMENTS

                                             SCHEDULED PRINCIPAL
                     PAYMENT DATE                  PAYMENTS
                  ------------------         -------------------

                  March 18, 2002                  $888,126.83
                  September 18, 2002                     0.00
                  March 18, 2003                   888,463.80
                  September 18, 2003                     0.00
                  March 18, 2004                   888,463.80
                  September 18, 2004                      .00
                  March 18, 2005                   888,463.80
                  September 18, 2005                     0.00
                  March 18, 2006                   888,463.80
                  September 18, 2006                     0.00
                  March 18, 2007                         0.00
                  September 18, 2007                     0.00
                  March 18, 2008                    20,155.85
                  September 18, 2008                     0.00
                  March 18, 2009                   802,179.00
                  September 18, 2009                     0.00
                  March 18, 2010                   802,179.00
                  September 18, 2010                     0.00
                  March 18, 2011                 1,296,194.42
                  September 18, 2011                     0.00

<PAGE>

                                     N3742C

                                   ----------

                                 SCHEDULE 1-A to
                         TRUST SUPPLEMENT NO. 2001-1A-1

                                 EQUIPMENT NOTE
                               PRINCIPAL PAYMENTS

                                             SCHEDULED PRINCIPAL
                     PAYMENT DATE                  PAYMENTS
                  ------------------         -------------------

                  March 18, 2002                  $890,423.46
                  September 18, 2002                     0.00
                  March 18, 2003                   890,770.30
                  September 18, 2003                     0.00
                  March 18, 2004                   890,770.30
                  September 18, 2004                     0.00
                  March 18, 2005                   890,770.30
                  September 18, 2005                     0.00
                  March 18, 2006                   890,770.30
                  September 18, 2006                     0.00
                  March 18, 2007                         0.00
                  September 18, 2007                     0.00
                  March 18, 2008                    20,208.16
                  September 18, 2008                     0.00
                  March 18, 2009                   804,261.50
                  September 18, 2009                     0.00
                  March 18, 2010                   804,261.50
                  September 18, 2010                     0.00
                  March 18, 2011                 1,299,559.42
                  September 18, 2011                     0.00

<PAGE>

                                     N3743H

                                   ----------

                                 SCHEDULE 1-A to
                         TRUST SUPPLEMENT NO. 2001-1A-1

                                 EQUIPMENT NOTE
                               PRINCIPAL PAYMENTS

                                             SCHEDULED PRINCIPAL
                     PAYMENT DATE                  PAYMENTS
                  ------------------         -------------------

                  March 18, 2002                  $890,423.46
                  September 18, 2002                     0.00
                  March 18, 2003                   890,770.30
                  September 18, 2003                     0.00
                  March 18, 2004                   890,770.30
                  September 18, 2004                     0.00
                  March 18, 2005                   890,770.30
                  September 18, 2005                     0.00
                  March 18, 2006                   890,770.30
                  September 18, 2006                     0.00
                  March 18, 2007                         0.00
                  September 18, 2007                     0.00
                  March 18, 2008                    20,208.16
                  September 18, 2008                     0.00
                  March 18, 2009                   804,261.50
                  September 18, 2009                     0.00
                  March 18, 2010                   804,261.50
                  September 18, 2010                     0.00
                  March 18, 2011                 1,299,559.42
                  September 18, 2011                     0.00

<PAGE>

                                     N3744F

                                   ----------

                                 SCHEDULE 1-A to
                         TRUST SUPPLEMENT NO. 2001-1A-1

                                 EQUIPMENT NOTE
                               PRINCIPAL PAYMENTS

                                             SCHEDULED PRINCIPAL
                     PAYMENT DATE                  PAYMENTS
                  ------------------         -------------------

                  March 18, 2002                  $896,690.58
                  September 18, 2002                     0.00
                  March 18, 2003                   897,030.80
                  September 18, 2003                     0.00
                  March 18, 2004                   897,030.80
                  September 18, 2004                     0.00
                  March 18, 2005                   897,030.80
                  September 18, 2005                     0.00
                  March 18, 2006                   897,030.80
                  September 18, 2006                     0.00
                  March 18, 2007                         0.00
                  September 18, 2007                     0.00
                  March 18, 2008                    20,350.20
                  September 18, 2008                     0.00
                  March 18, 2009                   809,914.00
                  September 18, 2009                     0.00
                  March 18, 2010                   809,914.00
                  September 18, 2010                     0.00
                  March 18, 2011                 1,308,692.96
                  September 18, 2011                     0.00

<PAGE>

                                     N3745B

                                   ----------

                                 SCHEDULE 1-A to
                         TRUST SUPPLEMENT NO. 2001-1A-1

                                 EQUIPMENT NOTE
                               PRINCIPAL PAYMENTS

                                             SCHEDULED PRINCIPAL
                     PAYMENT DATE                  PAYMENTS
                  ------------------         -------------------

                  March 18, 2002                  $898,996.21
                  September 18, 2002                     0.00
                  March 18, 2003                   899,337.30
                  September 18, 2003                     0.00
                  March 18, 2004                   899,337.30
                  September 18, 2004                     0.00
                  March 18, 2005                   899,337.30
                  September 18, 2005                     0.00
                  March 18, 2006                   899,337.30
                  September 18, 2006                     0.00
                  March 18, 2007                         0.00
                  September 18, 2007                     0.00
                  March 18, 2008                    20,402.52
                  September 18, 2008                     0.00
                  March 18, 2009                   811,996.50
                  September 18, 2009                     0.00
                  March 18, 2010                   811,996.50
                  September 18, 2010                     0.00
                  March 18, 2011                 1,312,057.95
                  September 18, 2011                     0.00

<PAGE>

                                     N3747D

                                   ----------

                                 SCHEDULE 1-A to
                         TRUST SUPPLEMENT NO. 2001-1A-1

                                 EQUIPMENT NOTE
                               PRINCIPAL PAYMENTS

                                             SCHEDULED PRINCIPAL
                     PAYMENT DATE                  PAYMENTS
                  ------------------         -------------------

                  March 18, 2002                  $896,690.58
                  September 18, 2002                     0.00
                  March 18, 2003                   897,030.80
                  September 18, 2003                     0.00
                  March 18, 2004                   897,030.80
                  September 18, 2004                     0.00
                  March 18, 2005                   897,030.80
                  September 18, 2005                     0.00
                  March 18, 2006                   897,030.80
                  September 18, 2006                     0.00
                  March 18, 2007                         0.00
                  September 18, 2007                     0.00
                  March 18, 2008                    20,350.20
                  September 18, 2008                     0.00
                  March 18, 2009                   809,914.00
                  September 18, 2009                     0.00
                  March 18, 2010                   809,914.00
                  September 18, 2010                     0.00
                  March 18, 2011                 1,308,692.96
                  September 18, 2011                     0.00

<PAGE>

                                     N685DA

                                   ----------

                                 SCHEDULE 1-A to
                         TRUST SUPPLEMENT NO. 2001-1A-1

                                 EQUIPMENT NOTE
                               PRINCIPAL PAYMENTS

                                             SCHEDULED PRINCIPAL
                     PAYMENT DATE                  PAYMENTS
                  ------------------         -------------------

                  March 18, 2002                  $833,252.31
                  September 18, 2002                     0.00
                  March 18, 2003                   833,563.32
                  September 18, 2003                     0.00
                  March 18, 2004                   833,563.33
                  September 18, 2004                     0.00
                  March 18, 2005                   833,563.32
                  September 18, 2005                     0.00
                  March 18, 2006                   833,563.33
                  September 18, 2006                     0.00
                  March 18, 2007                         0.00
                  September 18, 2007                     0.00
                  March 18, 2008                    36,431.39
                  September 18, 2008                     0.00
                  March 18, 2009                   752,610.28
                  September 18, 2009                     0.00
                  March 18, 2010                   752,610.29
                  September 18, 2010                     0.00
                  March 18, 2011                 1,351,754.70
                  September 18, 2011                     0.00

<PAGE>

                                     N686DA

                                   ----------

                                 SCHEDULE 1-A to
                         TRUST SUPPLEMENT NO. 2001-1A-1

                                 EQUIPMENT NOTE
                               PRINCIPAL PAYMENTS

                                             SCHEDULED PRINCIPAL
                     PAYMENT DATE                  PAYMENTS
                  ------------------         -------------------

                  March 18, 2002                        $0.00
                  September 18, 2002               856,353.56
                  March 18, 2003                         0.00
                  September 18, 2003               856,673.20
                  March 18, 2004                         0.00
                  September 18, 2004               856,673.21
                  March 18, 2005                         0.00
                  September 18, 2005               856,673.20
                  March 18, 2006                         0.00
                  September 18, 2006                     0.00
                  March 18, 2007                         0.00
                  September 18, 2007               161,514.61
                  March 18, 2008                         0.00
                  September 18, 2008               732,600.03
                  March 18, 2009                         0.00
                  September 18, 2009               773,475.80
                  March 18, 2010                         0.00
                  September 18, 2010               773,475.81
                  March 18, 2011                   655,890.00
                  September 18, 2011                     0.00

<PAGE>

                                 SCHEDULE I-B to
                        TRUST SUPPLEMENT NO. 2001-1A-1

                   AGGREGATE EQUIPMENT NOTE PRINCIPAL PAYMENTS

                     PAYMENT DATE            SCHEDULED PRINCIPAL PAYMENTS
                     ------------            ----------------------------

                     March 18, 2002          $19,553,275.50
                     September 18, 2002      $18,051,628.65
                     March 18, 2003          $19,560,668.65
                     September 18, 2003      $18,058,435.47
                     March 18, 2004          $19,560,668.64
                     September 18, 2004      $18,058,435.49
                     March 18, 2005          $19,560,668.63
                     September 18, 2005      $18,058,435.51
                     March 18, 2006          $19,560,668.67
                     September 18, 2006      $         0.00
                     March 18, 2007          $         0.00
                     September 18, 2007      $ 3,404,752.27
                     March 18, 2008          $   531,356.51
                     September 18, 2008      $15,207,594.37
                     March 18, 2009          $17,660.998.23
                     September 18, 2009      $16,304,657.25
                     March 18, 2010          $17,660,998.23
                     September 18, 2010      $16,304,657.22
                     March 18, 2011          $42,902,100.71
                     September 18, 2011      $         0.00

<PAGE>

                                 SCHEDULE II to
                        TRUST SUPPLEMENT NO. 2001-1A-1

                                EQUIPMENT NOTES,
                        PRINCIPAL AMOUNTS AND MATURITIES

       EQUIPMENT NOTES          PRINCIPAL AMOUNT         MATURITY
       ---------------          ----------------         --------

Series 2001-1 Equipment Note   $6,590,608.67          March 18, 2011
          (N3731T))

Series 2001-1 Equipment Note   $6,607,773.02          March 18, 2011
          (N3732J)

Series 2001-1 Equipment Note   $6,607,773.02          March 18, 2011
          (N3733Z)

Series 2001-1 Equipment Note   $6,607,773.02          March 18, 2011
          (N3734B)

Series 2001-1 Equipment Note   $6,615,345.54          March 18, 2011
          (N3735D)

Series 2001-1 Equipment Note   $6,615,345.54          March 18, 2011
          (N3736C)

Series 2001-1 Equipment Note   $6,615,345.54          March 18, 2011
          (N3737C)

Series 2001-1 Equipment Note   $6,615,345.54          March 18, 2011
          (N3738B)

Series 2001-1 Equipment Note   $6,615,345.54          March 18, 2011
          (N3739P)

Series 2001-1 Equipment Note   $7,171,269.68          March 18, 2011
          (N3740C)

Series 2001-1 Equipment Note   $7,362,690.30          March 18, 2011
          (N3741S)

Series 2001-1 Equipment Note   $7,381,804.24          March 18, 2011
          (N3742C)

Series 2001-1 Equipment Note   $7,381,804.24          March 18, 2011
          (N3743H)

Series 2001-1 Equipment Note   $7,433,684.94          March 18, 2011
          (N3744F)

Series 2001-1 Equipment Note   $7,452,798.88          March 18, 2011
          (N3745B)

Series 2001-1 Equipment Note   $7,433,684.94          March 18, 2011
          (N3747D)

Series 2001-1 Equipment Note   $7,060,912.27          March 18, 2011
          (N685DA)

Series 2001-1 Equipment Note   $6,523,329.42          March 18, 2011
          (N686DA)

Series 2001-1 Equipment Note   $8,079,194.30          March 18, 2011
          (N687DL)

Series 2001-1 Equipment Note   $8,079,194.30          March 18, 2011
          (N688DL)

Series 2001-1 Equipment Note   $8,098,978.73          March 18, 2011
          (N689DL)

Series 2001-1 Equipment Note   $7,470,372.52          March 18, 2011
          (N690DL)

Series 2001-1 Equipment Note   $7,527,653.66          March 18, 2011
          (N692DL)

Series 2001-1 Equipment Note   $7,545,902.52          March 18, 2011
          (N693DL)

Series 2001-1 Equipment Note   $7,566,685.94          March 18, 2011
          (N694DL)

Series 2001-1 Equipment Note   $7,587,976.27          March 18, 2011
          (N695DL)

Series 2001-1 Equipment Note   $8,937,818.72          March 18, 2011
          (N6714Q)

Series 2001-1 Equipment Note   $9,035,433.24          March 18, 2011
          (N6715C)

Series 2001-1 Equipment Note   $9,043,624.93          March 18, 2011
          (N6716C)

Series 2001-1 Equipment Note   $12,229,529.33         March 18, 2011
          (N169DZ)

Series 2001-1 Equipment Note   $11,358,392.97         March 18, 2011
          (N171DZ)

Series 2001-1 Equipment Note   $11,358,392.97         March 18, 2011
          (N172DZ)

Series 2001-1 Equipment Note   $11,419,222.49         March 18, 2011
          (N173DZ)

Series 2001-1 Equipment Note   $13,322,997.59         March 18, 2011
           (N1608)

Series 2001-1 Equipment Note   $13,322,997.59         March 18, 2011
           (N1609)

Series 2001-1 Equipment Note   $13,322,997.59         March 18, 2011
          (N1610D)

<PAGE>

                                 SCHEDULE III to
                         TRUST SUPPLEMENT NO. 2001-1A-1

                                    AIRCRAFT

                              AIRCRAFT
                            REGISTRATION
                              AIRCRAFT          NUMBER
                          ----------------      ------

                          Boeing 737-832        N3731T
                          Boeing 737-832        N3732J
                          Boeing 737-832        N3733Z
                          Boeing 737-832        N3734B
                          Boeing 737-832        N3735D
                          Boeing 737-832        N3736C
                          Boeing 737-832        N3737C
                          Boeing 737-832        N3738B
                          Boeing 737-832        N3739P
                          Boeing 737-832        N3740C
                          Boeing 737-832        N3741S
                          Boeing 737-832        N3742C
                          Boeing 737-832        N3743H
                          Boeing 737-832        N3744F
                          Boeing 737-832        N3745B
                          Boeing 737-832        N3747D
                          Boeing 737-232        N685DA
                          Boeing 737-232        N686DA
                          Boeing 737-232        N687DL
                          Boeing 737-232        N688DL
                          Boeing 737-232        N689DL
                          Boeing 737-232        N690DL
                          Boeing 737-232        N692DL
                          Boeing 737-232        N693DL
                          Boeing 737-232        N694DL
                          Boeing 737-232        N695DL
                          Boeing 737-232        N6714Q
                          Boeing 737-232        N6715C
                          Boeing 737-232        N6716C
                          Boeing 767-332ER      N169DZ
                          Boeing 767-332ER      N171DZ
                          Boeing 767-332ER      N172DZ
                          Boeing 767-332ER      N173DZ
                          Boeing 767-332ER      N1608
                          Boeing 767-332ER      N1609
                          Boeing 767-332ER      N1610D

<PAGE>

                                 SCHEDULE IV to
                         TRUST SUPPLEMENT NO. 2001-1A-1

                                 NOTE DOCUMENTS

                             Participation Agreement
                        Indenture and Security Agreement
                        Series 2001-1 A-1 Equipment Note
                        Series 2001-1 A-2 Equipment Note
                          Series 2001-1B Equipment Note
                          Series 2001-1C Equipment Note
                          Series 2001-1D Equipment Note

                       For each of the following aircraft:

                              AIRCRAFT
                            REGISTRATION
                              AIRCRAFT          NUMBER
                          ----------------      ------

                          Boeing 737-832        N3731T
                          Boeing 737-832        N3732J
                          Boeing 737-832        N3733Z
                          Boeing 737-832        N3734B
                          Boeing 737-832        N3735D
                          Boeing 737-832        N3736C
                          Boeing 737-832        N3737C
                          Boeing 737-832        N3738B
                          Boeing 737-832        N3739P
                          Boeing 737-832        N3740C
                          Boeing 737-832        N3741S
                          Boeing 737-832        N3742C
                          Boeing 737-832        N3743H
                          Boeing 737-832        N3744F
                          Boeing 737-832        N3745B
                          Boeing 737-832        N3747D
                          Boeing 737-232        N685DA
                          Boeing 737-232        N686DA
                          Boeing 737-232        N687DL
                          Boeing 737-232        N688DL
                          Boeing 737-232        N689DL
                          Boeing 737-232        N690DL
                          Boeing 737-232        N692DL
                          Boeing 737-232        N693DL
                          Boeing 737-232        N694DL
                          Boeing 737-232        N695DL
                          Boeing 737-232        N6714Q
                          Boeing 737-232        N6715C
                          Boeing 737-232        N6716C
                          Boeing 767-332ER      N169DZ
                          Boeing 767-332ER      N171DZ
                          Boeing 767-332ER      N172DZ
                          Boeing 767-332ER      N173DZ
                          Boeing 767-332ER      N1608
                          Boeing 767-332ER      N1609
                          Boeing 767-332ER      N1610D

Source: [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00030-of-00352.parquet"}, [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00030-of-00352.parquet"}]]