<PAGE>   1
                                                                     EXHIBIT 4.9



                           REVOLVING CREDIT AGREEMENT
                                    (2000-lB)

                          Dated as of January 28, 2000

                                     between

                            WILMINGTON TRUST COMPANY,

                    not in its individual capacity but solely
                             as Subordination Agent,
                          as agent and trustee for the
                      Atlas Air Pass Through Trust 2000-lB,


                                   as Borrower

                                       and

                     MORGAN STANLEY CAPITAL SERVICES, INC.,

                              as Liquidity Provider





                                   Relating to

                      Atlas Air Pass Through Trust 2000-lB
                   9.057% Atlas Air Pass Through Certificates,
                                 Series 2000-lB



<PAGE>   2


                                TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                                                                              PAGE
                                                                                              ----
<S>                                                                                           <C>
                                     ARTICLE I DEFINITIONS

Section 1.01. Certain Defined Terms 1

                          ARTICLE II AMOUNT AND TERMS OF THE COMMITMENT

Section 2.01. The Advances                                                                     9
Section 2.02. Making the Advances                                                              9
Section 2.03. Fees                                                                            11
Section 2.04. Reduction or Termination of the Maximum Commitment                              11
Section 2.05. Repayments of Interest Advances or the Final Advance                            11
Section 2.06. Repayments of Provider Advances                                                 12
Section 2.07. Payments to the Liquidity Provider Under the Intercreditor Agreement            13

Section 2.08. Book Entries                                                                    13
Section 2.09. Payments from Available Funds Only                                              13
Section 2.10. Extension of the Expiry Date; Non-Extension Advance                             14

                             ARTICLE III OBLIGATIONS OF THE BORROWER

Section 3.01. Increased Costs                                                                 14
Section 3.02. Capital Adequacy                                                                15
Section 3.03. Payments Free of Deductions                                                     16
Section 3.04. Payments                                                                        16
Section 3.05. Computations                                                                    17
Section 3.06. Payment on Non-Business Days                                                    17
Section 3.07. Interest                                                                        17
Section 3.08. Replacement of Borrower                                                         19
Section 3.09. Funding Loss Indemnification                                                    19
Section 3.10. Illegality                                                                      19

                                 ARTICLE IV CONDITIONS PRECEDENT

Section 4.01. Conditions Precedent to Effectiveness of Section 2.01                           20
Section 4.02. Conditions Precedent to Borrowing                                               22

                                       ARTICLE V COVENANTS

Section 5.01. Affirmative Covenants of the Borrower                                           22
Section 5.02. Negative Covenants of the Borrower                                              22

                             ARTICLE VI LIQUIDITY EVENTS OF DEFAULT

Section 6.01. Liquidity Events of Default                                                     23

                                    ARTICLE VII MISCELLANEOUS

Section 7.01. Amendments, Etc.                                                                23
Section 7.02. Notices, Etc.                                                                   23
</TABLE>

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<TABLE>
<S>                                                                                               <C>
Section 7.03. No Waiver: Remedies                                                                   24
Section 7.04. Further Assurances                                                                    24
Section 7.05. Indemnification; Survival of Certain Provisions                                       24
Section 7.06. Liability of the Liquidity Provider                                                   25
Section 7.07. Costs, Expenses and Taxes                                                             25
Section 7.08. Binding Effect; Participations                                                        26
Section 7.09. Severability                                                                          27
Section 7.10. GOVERNING LAW                                                                         27
Section 7.11. Submission to Jurisdiction; Waiver of Jury Trial; Waiver of Immunity                  27
Section 7.12. Execution in Counterparts                                                             28
Section 7.13. Entirety                                                                              29
Section 7.14. Headings                                                                              29
Section 7.15. LIQUIDITY PROVIDER'S OBLIGATION TO MAKE ADVANCES                                      29
</TABLE>



<PAGE>   4



ANNEX I      Interest Advance Notice of Borrowing

ANNEX II     Downgrade Advance Notice of Borrowing

ANNEX III    Final Advance Notice of Borrowing

ANNEX IV     Notice of Termination

ANNEX V      Notice of Replacement Subordination Agent

EXHIBIT I    Form of Guarantee Agreement


<PAGE>   5



                           REVOLVING CREDIT AGREEMENT

                  This REVOLVING CREDIT AGREEMENT dated as of January 28, 2000,
between WILMINGTON TRUST COMPANY, a Delaware banking corporation ("WTC"), not in
its individual capacity but solely as Subordination Agent under the
Intercreditor Agreement (each as defined below), as agent and trustee for the
Class B Trust (as defined below) (the "Borrower"), and MORGAN STANLEY CAPITAL
SERVICES, INC., a Delaware corporation ("MSCS" or the "Liquidity Provider").


                              W I T N E S S E T H:
                              - - - - - - - - - -

                  WHEREAS, pursuant to the Class B Trust Agreement (such term
and all other capitalized terms used in these recitals having the meanings set
forth or referred to in Section 1.01), the Class B Trust is issuing the Class B
Certificates;

                  WHEREAS, the Borrower, in order to support the timely payment
of a portion of the interest on the Class B Certificates in accordance with
their terms, has requested the Liquidity Provider to enter into this Agreement,
providing in part for the Borrower to request in specified circumstances that
Advances be made hereunder; and

                  WHEREAS, the Liquidity Provider has requested Morgan Stanley
Dean Witter & Co. (the "Guarantor") to enter into a Guarantee Agreement,
providing for the full and unconditional guarantee of the Liquidity Provider's
obligations under this Agreement (the "Guarantee Agreement");


                  NOW, THEREFORE, in consideration of the premises, the parties
hereto agree as follows:

                                    ARTICLE I

                                   DEFINITIONS

                  Section 1.01. Certain Defined Terms. (a) Definitions. As used
in this Agreement and unless otherwise expressly indicated, or unless the
context clearly requires otherwise, the following capitalized terms shall have
the following respective meanings for all purposes of this Agreement:

                  "Additional Cost" has the meaning assigned to such term in
         Section 3.01.



<PAGE>   6


                  "Advance" means an Interest Advance, a Final Advance or a
         Provider Advance, as the case may be.

                  "Applicable Liquidity Rate" has the meaning assigned to such
         term in Section 3.07(f).

                  "Applicable Margin" means (x) with respect to any Unpaid
         Advance or Applied Provider Advance, 2.00% and (y) with respect to any
         Unapplied Downgrade Advance or Unapplied Non-Extension Advance, 0.50%.

                  "Applied Downgrade Advance" has the meaning assigned to such
         term in Section 2.06(a).

                  "Applied Non-Extension Advance" has the meaning assigned to
         such term in Section 2.06(a).

                  "Applied Provider Advance" has the meaning assigned to such
         term in Section 2.06(a).

                  "Base Rate" means a fluctuating interest rate per annum in
         effect from time to time, which rate per annum shall at all times be
         equal to (a) the weighted average of the rates on overnight Federal
         funds transactions with members of the Federal Reserve System arranged
         by Federal funds brokers, as published for such day (or, if such day is
         not a Business Day, for the next preceding Business Day) by the Federal
         Reserve Bank of New York, or if such rate is not so published for any
         day that is a Business Day, the average of the quotations for such day
         for such transactions received by the Liquidity Provider from three
         Federal funds brokers of recognized standing selected by it, plus (b)
         one-quarter of one percent (1/4 of 1%).

                  "Base Rate Advance" means an Advance that bears interest at a
         rate based upon the Base Rate.

                  "Borrower" has the meaning assigned to such term in the
         recital of parties to this Agreement.

                  "Borrowing" means the making of Advances requested by delivery
         of a Notice of Borrowing.

                  "Business Day" means any day other than a Saturday or Sunday
         or a day on which commercial banks are required or authorized to close
         in Denver, Colorado, New York, New York, or, so long as any Class B
         Certificate is outstanding, the city and state in which the Class B
         Trustee, the Borrower or any Loan Trustee maintains its Corporate Trust
         Office or receives or disburses funds, and, if the applicable Business
         Day relates to any Advance or other amount bearing interest based on
         the LIBOR Rate, on which dealings are carried on in the London
         interbank market.

<PAGE>   7

                  "Certificates of Deposit" has the meaning assigned to such
         term in the Deposit Agreement.

                  "Deposit" has the meaning assigned to such terms in the
         Deposit Agreement.

                  "Depositary" has the meaning assigned to such term in the
         Deposit Agreement.

                  "Deposit Agreement" means the Deposit Agreement dated January
         28, 2000 between First Security Bank, National Association, as Escrow
         Agent and Westdeutsche Landesbank Girozentrale, acting through its New
         York Branch, as Depositary, pertaining to the Class B Certificates, as
         the same may be amended, modified or supplemented from time to time in
         accordance with the terms thereof.

                  "Downgrade Advance" means an Advance made pursuant to Section
         2.02(c).

                  "Effective Date" has the meaning specified in Section 4.01.
         The delivery of the certificate of the Liquidity Provider contemplated
         by Section 4.01(e) shall be conclusive evidence that the Effective Date
         has occurred.

                  "Excluded Taxes" means (i) taxes imposed on the overall net
         income of the Liquidity Provider or of its Lending Office by the
         jurisdiction where such Liquidity Provider's principal office or such
         Lending Office is located, and (ii) Excluded Withholding Taxes.

                  "Excluded Withholding Taxes" means (i) withholding Taxes
         imposed by the United States except to the extent that such United
         States withholding Taxes are imposed as a result of any change in
         applicable law after the date hereof (excluding from change in
         applicable law for this purpose a change in an applicable treaty or
         other change in law affecting the applicability of a treaty), or in the
         case of a successor Liquidity Provider (including a transferee of an
         Advance) or Lending Office, after the date on which such successor
         Liquidity Provider obtains its interest or on which the Lending Office
         is changed, and (ii) any withholding Taxes imposed by the United States
         which are imposed or increased as a result of the Liquidity Provider
         failing to deliver to the Borrower any certificate or document (which
         certificate or document in the good faith judgment of the Liquidity
         Provider it is legally entitled to provide) which is reasonably
         requested by the Borrower to establish that payments under this
         Agreement are exempt from (or entitled to a reduced rate of)
         withholding Tax.

                  "Expenses" means liabilities, obligations, damages,
         settlements, penalties, claims, actions, suits, costs, expenses, and
         disbursements (including, without limitation, reasonable fees and
         disbursements of legal counsel and costs of investigation), provided
         that Expenses shall not include any Taxes.

<PAGE>   8

                  "Expiry Date" means January 26, 2001, initially, or any date
         to which the Expiry Date is extended pursuant to Section 2.10.

                  "Final Advance" means an Advance made pursuant to Section
         2.02(d).

                  "Guarantee Agreement" has the meaning assigned to such term in
         the preliminary statements of this Agreement.

                  "Guarantee Event" has the meaning specified in Section 2.02(c)

                  "Guarantor" has the meaning assigned to such term in the
         preliminary statements of this Agreement.

                  "Intercreditor Agreement" means the Intercreditor Agreement
         dated the date hereof, among the Trustees, the Liquidity Provider, the
         liquidity provider under each Liquidity Facility (other than this
         Agreement) and the Subordination Agent, as the same may be amended,
         supplemented or otherwise modified from time to time in accordance with
         its terms.

                  "Interest Advance" means an Advance made pursuant to Section
         2.02(a).

                  "Interest Period" means, with respect to any LIBOR Advance,
         each of the following periods:'

         (i)      the period beginning on the third Business Day following
                  either (x) the Liquidity Provider's receipt of the Notice of
                  Borrowing for such LIBOR Advance or (y) the withdrawal of
                  funds from the Class B Cash Collateral Account for the purpose
                  of paying interest on the Class B Certificates as contemplated
                  by Section 2.06(a) hereof and, in either case, ending on the
                  next Regular Distribution Date (or ending, in the case of an
                  Interest Period applicable to any Unapplied Provider Advance,
                  on the numerically corresponding day in the first or sixth
                  calendar month after the first day of the applicable Interest
                  Period and/or on the next Regular Distribution Date, as Atlas
                  may select by providing notice thereof to the Borrower and the
                  Liquidity Provider no later than three Business Days prior to
                  the commencement of such Interest Period, provided that if
                  Atlas shall not provide such a notice at least three Business
                  Days prior to the commencement of such Interest Period, then
                  Atlas shall be deemed to have selected an Interest Period
                  ending on the next Regular Distribution Date); and

         (ii)     each subsequent period commencing on the last day of the
                  immediately preceding Interest Period and ending on the next
                  Regular Distribution Date (or ending, in the case of an
                  Interest Period applicable to any Unapplied Provider Advance,
                  on the numerically corresponding day in the first or

<PAGE>   9

                  sixth calendar month after the first day of the applicable
                  Interest Period and/or on the next Regular Distribution Date,
                  as Atlas may select by providing notice thereof to the
                  Borrower and the Liquidity Provider no later than three
                  Business Days prior to the commencement of such Interest
                  Period, provided that if Atlas shall not provide such a notice
                  at least three Business Days prior to the commencement of such
                  Interest Period, then Atlas shall be deemed to have selected
                  an Interest Period ending on the next Regular Distribution
                  Date);

         provided, however, that (I) if an Unapplied Provider Advance which is a
         LIBOR Advance becomes an Applied Provider Advance, the Interest Period
         then applicable to such Unapplied Provider Advance shall be applicable
         to such Applied Provider Advance, (II) if (x) the Final Advance shall
         have been made, or (y) other outstanding Advances shall have been
         converted into the Final Advance, then the Interest Periods shall be
         successive periods of one month beginning on the third Business Day
         following the Liquidity Provider's receipt of the Notice of Borrowing
         for such Final Advance (in the case of clause (x) above) or the Regular
         Distribution Date following such conversion (in the case of clause (y)
         above) and (III) each Interest Period shall end on or prior to the next
         Regular Distribution Date.

                  "Leased Aircraft Participation Agreement" means a
         participation agreement substantially in the form of Exhibit A-1 to the
         Note Purchase Agreement.

                  "Lending Office" means the lending office of the Liquidity
         Provider presently located at New York, New York, or such other lending
         office as the Liquidity Provider from time to time shall notify the
         Borrower as its lending office hereunder; provided that the Liquidity
         Provider shall not change its Lending Office to a Lending Office
         outside the United States of America except in accordance with Section
         3.01, 3.02 or 3.03 hereof.

                  "LIBOR Advance" means an Advance bearing interest at a rate
         based upon the LIBOR Rate.

                  "LIBOR Rate" means, with respect to any Interest Period, (i)
         the rate per annum appearing on display page 3750 (British Bankers
         Association-LIBOR) of the Dow Jones Markets Service (or any successor
         or substitute therefor) at approximately 11:00 A.M. (London time) two
         Business Days before the first day of such Interest Period, as the rate
         for dollar deposits with a maturity comparable to such Interest Period,
         or (ii) if the rate calculated pursuant to clause (i) above is not
         available, the average (rounded upwards, if necessary, to the next 1/16
         of 1%) of the rates per annum at which deposits in dollars are offered
         for the relevant Interest Period by three banks of recognized standing
         selected by the Liquidity Provider in the London interbank market at
         approximately 11:00 A.M. (London time) two Business Days before the
         first day of such Interest Period in an amount approximately equal to
         the principal amount of the LIBOR Advance to which such Interest Period
         is to apply and for a period comparable to such Interest Period.

<PAGE>   10

                  "Liquidity Event of Default" means the occurrence of either
         (a) the Acceleration of all of the Equipment Notes or (b) an Atlas
         Bankruptcy Event.

                  "Liquidity Indemnitee" means (i) the Liquidity Provider, (ii)
         the Guarantor, (iii) the respective directors, officers, employees and
         agents of the Liquidity Provider and the Guarantor, and (iv) the
         successors and permitted assigns of the persons described in clauses
         (i) through (iii), inclusive.

                  "Liquidity Provider" has the meaning assigned to such term in
         the recital of parties to this Agreement.

                  "Maximum Commitment" shall mean, subject to the proviso
         contained in the third sentence of Section 2.02(a), at any time of
         determination, (a) the Required Amount at such time less (b) the
         aggregate amount of each Interest Advance outstanding at such time;
         provided that following a Provider Advance or a Final Advance, the
         Maximum Commitment shall be zero.

                  "Non-Extension Advance" means an Advance pursuant to Section
         2.02(b).

                  "Notice of Borrowing" has the meaning specified in Section
         2.02(e).

                  "Notice of Replacement Subordination Agent" has the meaning
         specified in Section 3.08.

                  "Offering Memorandum" means the Offering Memorandum dated
         January 20, 2000 relating to the Certificates.

                  "Owned Aircraft Participation Agreement" means a participation
         agreement substantially in the form of Exhibit C-1 to the Note Purchase
         Agreement.

                  "Participation Agreements" means, collectively, the Leased
         Aircraft Participation Agreement and the Owned Aircraft Participation
         Agreement.

                  "Performing Note Deficiency" means any time that less than 65%
         of the then aggregate outstanding principal amount of all Equipment
         Notes are Performing Equipment Notes.

                  "Provider Advance" means a Downgrade Advance or a
         Non-Extension Advance.

                  "Regulatory Change" has the meaning assigned to such term in
         Section 3.01.

                  "Replenishment Amount" has the meaning assigned to such term
         in Section 2.06(b).

<PAGE>   11

                  "Required Amount" means, for any day, the sum of the aggregate
         amount of interest, calculated at the rate per annum equal to the
         Stated Interest Rate for the Class B Certificates, that would be
         payable on the Class B Certificates on each of the three successive
         semiannual Regular Distribution Dates immediately following such day
         or, if such day is a Regular Distribution Date, on such day and the
         succeeding two semiannual Regular Distribution Dates, in each case
         calculated on the basis of the Pool Balance of the Class B Certificates
         on such day and without regard to expected future payments of principal
         on the Class B Certificates.

                  "Termination Date" means the earliest to occur of the
         following: (i) the Expiry Date; (ii) the date on which the Borrower
         delivers to the Liquidity Provider a certificate, signed by a
         Responsible Officer of the Borrower, certifying that all of the Class B
         Certificates have been paid in full (or provision has been made for
         such payment in accordance with the Intercreditor Agreement and the
         Trust Agreements) or are otherwise no longer entitled to the benefits
         of this Agreement; (iii) the date on which the Borrower delivers to the
         Liquidity Provider a certificate, signed by a Responsible Officer of
         the Borrower, certifying that a Replacement Liquidity Facility has been
         substituted for this Agreement in full pursuant to Section 3.6(e) of
         the Intercreditor Agreement; (iv) the fifth Business Day following the
         receipt by the Borrower of a Termination Notice from the Liquidity
         Provider pursuant to Section 6.01 hereof; and (v) the date on which no
         Advance is or may (including by reason of reinstatement as herein
         provided) become available for a Borrowing hereunder.

                  "Termination Notice" means the Notice of Termination
         substantially in the form of Annex IV to this Agreement.

                  "Transferee" has the meaning assigned to such term in Section
         7.08(b).

                  "Unapplied Downgrade Advance" means any Downgrade Advance
         other than an Applied Downgrade Advance.

                  "Unapplied Non-Extension Advance" means any Non-Extension
         Advance other than an Applied Non-Extension Advance.

                  "Unapplied Provider Advance" means any Provider Advance other
         than an Applied Provider Advance.

                  "Unpaid Advance" has the meaning assigned to such term in
         Section 2.05.

                  (b) Terms Defined in the Intercreditor Agreement. For all
purposes of this Agreement, the following terms shall have the respective
meanings assigned to such terms in the Intercreditor Agreement:

         "Acceleration", Atlas", "Atlas Bankruptcy Event", "Certificates",
         "Class A Certificates", "Class B Cash Collateral Account", "Class B
         Certificates", "Class B Certificateholder",


<PAGE>   12

         "Class B Trust", "Class B Trust Agreement", "Class B Trustee", "Class C
         Certificates", "Closing Date", "Controlling Party", "Corporate Trust
         Office", "Distribution Date", "Downgraded Facility", "Equipment Notes",
         "Final Legal Distribution Date", "Financing Agreement", "Indenture",
         "Interest Payment Date", "Investment Earnings", "Liquidity Facility",
         "Liquidity Obligations", "Loan Trustee", "MSCS Fee Letter", "MSCS
         Liquidity Facilities", "Non-Extended Facility", "Note Purchase
         Agreement", "Operative Agreements", "Performing Equipment Note",
         "Person", "Placement Agents", "Placement Agreement", "Pool Balance",
         "Rating Agencies", "Ratings Confirmation", "Regular Distribution
         Dates", "Replacement Liquidity Facility", "Responsible Officer",
         "Scheduled Payment", "Special Payment", "Stated Interest Rate",
         "Subordination Agent", "Taxes", "Threshold Rating", "Trust Agreement",
         "Trustee", and "Written Notice".




<PAGE>   13


                                   ARTICLE II

                       AMOUNT AND TERMS OF THE COMMITMENT

                  Section 2.01. The Advances. The Liquidity Provider hereby
irrevocably agrees, on the terms and conditions hereinafter set forth, to make
Advances to the Borrower from time to time on any Business Day during the period
from the Effective Date until 12:00 Noon (New York City time) on the Expiry Date
(unless the obligations of the Liquidity Provider shall be earlier terminated in
accordance with the terms of Section 2.04(b)) in an aggregate amount at any time
outstanding not to exceed the Maximum Commitment.

                  Section 2.02. Making the Advances. (a) Interest Advances shall
be made in one or more Borrowings by delivery to the Liquidity Provider of one
or more written and completed Notices of Borrowing in substantially the form of
Annex I attached hereto, signed by a Responsible Officer of the Borrower, in an
amount not exceeding the Maximum Commitment at such time and shall be used
solely for the payment when due of the interest on the Class B Certificates at
the Stated Interest Rate therefor in accordance with Section 3.6(a) of the
Intercreditor Agreement. Each Interest Advance made hereunder shall
automatically reduce the Maximum Commitment and the amount available to be
borrowed hereunder by subsequent Advances by the amount of such Interest Advance
(subject to reinstatement as provided in the next sentence). Upon repayment to
the Liquidity Provider in full of the amount of any Interest Advance made
pursuant to this Section 2.02(a), together with accrued interest thereon (as
provided herein), the Maximum Commitment shall be reinstated by the amount of
such repaid Interest Advance; provided, however, that the Maximum Commitment
shall not be so reinstated at any time if (i) a Liquidity Event of Default shall
have occurred and be continuing and (ii) there is a Performing Note Deficiency.

                  (b) A Non-Extension Advance shall be made in a single
Borrowing if this Agreement is not extended in accordance with section 3.6(d) of
the Intercreditor Agreement (unless a Replacement Liquidity Facility to replace
this Agreement shall have been delivered to the Borrower as contemplated by said
Section 3.6(d) within the time period specified in such Section) by delivery to
the Liquidity Provider of a written and completed Notice of Borrowing in
substantially the form of Annex II attached hereto, signed by a Responsible
Officer of the Borrower, in an amount equal to the Maximum Commitment at such
time, and shall be used to fund the Class B Cash Collateral Account in
accordance with said Section 3.6(d) and Section 3.6(f) of the Intercreditor
Agreement.

                  (c) A Downgrade Advance shall be made in a single Borrowing,
as provided for in Section 3.6(c) of the Intercreditor Agreement, (i) upon a
downgrading of the Guarantor's short-term unsecured debt rating issued by either
Rating Agency below the applicable Threshold Rating or (ii) if the Guarantee
Agreement ceases to be in full force and effect, becomes invalid or
unenforceable or the Guarantor denies its liability thereunder (any such
occurrence, a "Guarantee Event"), unless a Replacement Liquidity Facility to
replace this Agreement shall have been previously delivered to the Borrower in
accordance with said Section 3.6(c), by delivery to the Liquidity Provider of a
written and completed Notice of Borrowing in substantially the form of

<PAGE>   14

Annex III attached hereto, signed by a Responsible Officer of the Borrower, in
an amount equal to the Maximum Commitment at such time, and shall be used to
fund the Class B Cash Collateral Account in accordance with said Section 3.6(c)
and Section 3.6(f) of the Intercreditor Agreement.

                  (d) A Final Advance shall be made in a single Borrowing upon
the receipt by the Borrower of a Termination Notice from the Liquidity Provider
pursuant to Section 6.01 hereof by delivery to the Liquidity Provider of a
written and completed Notice of Borrowing in substantially the form of Annex IV
attached hereto, signed by a Responsible Officer of the Borrower, in an amount
equal to the Maximum Commitment at such time, and shall be used to fund the
Class B Cash Collateral Account (in accordance with Section 3.6(i) of the
Intercreditor Agreement) and Section 3.6(f) of the Intercreditor Agreement.

                  (e) Each Borrowing shall be made on notice in writing (a
"Notice of Borrowing") in substantially the form required by Section 2.02(a),
2.02(b), 2.02(c) or 2.02(d), as the case may be, given by the Borrower to the
Liquidity Provider. If a Notice of Borrowing is delivered by the Borrower in
respect of any Borrowing no later than 1:00 PM (New York City time) on a
Business Day, upon satisfaction of the conditions precedent set forth in Section
4.02 with respect to a requested Borrowing, the Liquidity Provider shall make
available to the Borrower, in accordance with its payment instructions, the
amount of such Borrowing in U.S. dollars and immediately available funds, before
4:00 PM (New York City time) on the day of receipt of such Notice of Borrowing
or on such later Business Day specified in such Notice of Borrowing. If a Notice
of Borrowing is delivered by the Borrower in respect of any Borrowing after 1:00
PM (New York City time) on a Business Day, upon satisfaction of the conditions
precedent set forth in Section 4.02 with respect to a requested Borrowing, the
Liquidity Provider shall make available to the Borrower, in accordance with its
payment instructions, the amount of such Borrowing in U.S. dollars and
immediately available funds, before 4:00 PM (New York City time) on the first
Business Day next following the day of receipt of such Notice of Borrowing or on
such later Business Day specified by the Borrower in such Notice of Borrowing.
Payments of proceeds of a Borrowing shall be made by wire transfer of
immediately available funds to the Borrower in accordance with such wire
transfer instructions as the Borrower shall furnish from time to time to the
Liquidity Provider for such purpose. Each Notice of Borrowing shall be
irrevocable and binding on the Borrower.

                  (f) Upon the making of any Advance requested pursuant to a
Notice of Borrowing, in accordance with the Borrower's payment instructions, the
Liquidity Provider shall be fully discharged of its obligation hereunder with
respect to such Notice of Borrowing, and the Liquidity Provider shall not
thereafter be obligated to make any further Advances hereunder in respect of
such Notice of Borrowing to the Borrower or to any other Person. If the
Liquidity Provider makes an Advance requested pursuant to a Notice of Borrowing
before 12:00 Noon (New York City time) on the second Business Day after the date
of payment specified in said Section 2.02(e), the Liquidity Provider shall have
fully discharged its obligations hereunder with respect to such Advance and an
event of default shall not have occurred hereunder. Following the making of any
Advance pursuant to Section 2.02(b), (c) or (d) hereof to fund the Class B Cash
Collateral Account, the Liquidity Provider shall have no interest in or rights
to the Class B Cash Collateral Account, such Advance or any other amounts from
time to time on deposit in the

<PAGE>   15

Class B Cash Collateral Account; provided that the foregoing shall not affect or
impair the obligations of the Subordination Agent to make the distributions
contemplated by Section 3.6(e) or (f) of the Intercreditor Agreement. By paying
to the Borrower proceeds of Advances requested by the Borrower in accordance
with the provisions of this Agreement, the Liquidity Provider makes no
representation as to, and assumes no responsibility for, the correctness or
sufficiency for any purpose of the amount of the Advances so made and requested.

                  Section 2.03. Fees. The Borrower agrees to pay to the
Liquidity Provider the fees set forth in the MSCS Fee Letter.

                  Section 2.04. Reduction or Termination of the Maximum
Commitment.

                  (a) Automatic Reduction. Promptly following each date on which
the Required Amount is reduced as a result of a reduction in the Pool Balance of
the Class B Certificates or otherwise, the Maximum Commitment shall
automatically be reduced to an amount equal to such reduced Required Amount (as
calculated by the Borrower). The Borrower shall give notice of any such
automatic reduction of the Maximum Commitment to the Liquidity Provider within
two Business Days thereof. The failure by the Borrower to furnish any such
notice shall not affect such automatic reduction of the Maximum Commitment.

                  (b) Termination. Upon the making of any Provider Advance or
Final Advance hereunder or the occurrence of the Termination Date, the
obligation of the Liquidity Provider to make further Advances hereunder shall
automatically and irrevocably terminate, and the Borrower shall not be entitled
to request any further Borrowing hereunder.

                  Section 2.05. Repayments of Interest Advances or the Final
Advance. Subject to Sections 2.06, 2.07 and 2.09 hereof, the Borrower hereby
agrees, without notice of an Advance or demand for repayment from the Liquidity
Provider (which notice and demand are hereby waived by the Borrower), to pay, or
to cause to be paid, to the Liquidity Provider on each date on which the
Liquidity Provider shall make an Interest Advance or the Final Advance, an
amount equal to (a) the amount of such Advance (any such Advance, until repaid,
is referred to herein as an "Unpaid Advance"), plus (b) interest on the amount
of each such Unpaid Advance as provided in Section 3.07 hereof; provided that if
(i) the Liquidity Provider shall make a Provider Advance at any time after
making one or more Interest Advances which shall not have been repaid in
accordance with this Section 2.05 or (ii) this Liquidity Facility shall become a
Downgraded Facility or Non-Extended Facility at any time when unreimbursed
Interest Advances have reduced the Maximum Commitment to zero, then such
Interest Advances shall cease to constitute Unpaid Advances and shall be deemed
to have been changed into an Applied Downgrade Advance or Applied Non-Extension
Advance for all purposes of this Agreement (including, without limitation, for
the purpose of determining when such Interest Advance is required to be repaid
to the Liquidity Provider in accordance with Section 2.06 and for the purposes
of Section 2.06(b)). The Borrower and the Liquidity Provider agree that the
repayment in full of each Interest Advance and Final Advance on the date such
Advance is made is intended to be a contemporaneous exchange for new value given
to the Borrower by the Liquidity Provider.

<PAGE>   16


                  Section 2.06. Repayments of Provider Advances. (a) Amounts
advanced hereunder in respect of a Provider Advance shall be deposited in the
Class B Cash Collateral Account, invested and withdrawn from the Class B Cash
Collateral Account as set forth in Sections 3.6(c), (d) and (f) of the
Intercreditor Agreement. The Borrower agrees to pay to the Liquidity Provider,
on each Regular Distribution Date, commencing on the first Regular Distribution
Date after the making of a Provider Advance, interest on the principal amount of
any such Provider Advance as provided in Section 3.07; provided, however, that
amounts in respect of a Provider Advance withdrawn from the Class B Cash
Collateral Account for the purpose of paying interest on the Class B
Certificates in accordance with Section 3.6(f) of the Intercreditor Agreement
(the amount of any such withdrawal being (x) in the case of a Downgrade Advance,
an "Applied Downgrade Advance" and (y) in the case of a Non-Extension Advance,
an "Applied Non-Extension Advance" and, together with an Applied Downgrade
Advance, an "Applied Provider Advance") shall thereafter (subject to Section
2.06(b)) be treated as an Interest Advance under this Agreement for purposes of
determining the Applicable Liquidity Rate for interest payable thereon; provided
further, however, that if, following the making of a Provider Advance, the
Liquidity Provider delivers a Termination Notice to the Borrower pursuant to
Section 6.01 hereof, such Provider Advance shall thereafter be treated as a
Final Advance under this Agreement for purposes of determining the Applicable
Liquidity Rate for interest payable thereon. Subject to Sections 2.07 and 2.09
hereof, immediately upon the withdrawal of any amounts from the Class B Cash
Collateral Account on account of a reduction in the Required Amount, the
Borrower shall repay to the Liquidity Provider a portion of the Provider
Advances in a principal amount equal to such reduction, plus interest on the
principal amount prepaid as provided in Section 3.07 hereof.

                  (b) At any time when an Applied Provider Advance (or any
portion thereof) is outstanding, upon the deposit in the Class B Cash Collateral
Account of any amount pursuant to clause "third" of Section 2.4(b) of the
Intercreditor Agreement, clause "third" of Section 3.2 of the Intercreditor
Agreement or clause "fourth" of Section 3.3 of the Intercreditor Agreement (any
such amount being a "Replenishment Amount") for the purpose of replenishing or
increasing the balance thereof up to the Required Amount at such time, (i) the
aggregate outstanding principal amount of all Applied Provider Advances (and of
Provider Advances treated as an Interest Advance for purposes of determining the
Applicable Liquidity Rate for interest payable thereon) shall be automatically
reduced by the amount of such Replenishment Amount and (ii) the aggregate
outstanding principal amount of all Unapplied Provider Advances shall be
automatically increased by the amount of such Replenishment Amount.

                  (c) Upon the provision of a Replacement Liquidity Facility in
replacement of this Agreement in accordance with Section 3.6(e) of the
Intercreditor Agreement, amounts remaining on deposit in the Class B Cash
Collateral Account after giving effect to any Applied Provider Advance on the
date of such replacement shall be reimbursed to the Liquidity Provider, but only
to the extent such amounts are necessary to repay in full to the Liquidity
Provider all amounts owing to it hereunder.

                  Section 2.07. Payments to the Liquidity Provider Under the
Intercreditor Agreement. In order to provide for payment or repayment to the
Liquidity Provider of any

<PAGE>   17

amounts hereunder, the Intercreditor Agreement provides that amounts available
and referred to in Articles II and III of the Intercreditor Agreement, to the
extent payable to the Liquidity Provider pursuant to the terms of the
Intercreditor Agreement (including, without limitation, Section 3.6(f) of the
Intercreditor Agreement), shall be paid to the Liquidity Provider in accordance
with the terms thereof. Amounts so paid to the Liquidity Provider shall be
applied by the Liquidity Provider to Liquidity Obligations then due and payable
in accordance with the Intercreditor Agreement or, if not provided for in the
Intercreditor Agreement, then in such manner as the Liquidity Provider shall
deem appropriate.

                  Section 2.08. Book Entries. The Liquidity Provider shall
maintain in accordance with its usual practice an account or accounts evidencing
the indebtedness of the Borrower resulting from Advances made from time to time
and the amounts of principal and interest payable hereunder and paid from time
to time in respect thereof; provided, however, that the failure by the Liquidity
Provider to maintain such account or accounts shall not affect the obligations
of the Borrower in respect of Advances.

                  Section 2.09. Payments from Available Funds Only. All payments
to be made by the Borrower under this Agreement shall be made only from the
amounts that constitute Scheduled Payments, Special Payments or payments under
Section 8.1 or 9.1, as the case may be, of the Participation Agreements and
Section 6 of the Note Purchase Agreement and only to the extent that the
Borrower shall have sufficient income or proceeds therefrom to enable the
Borrower to make payments in accordance with the terms hereof after giving
effect to the priority of payments provisions set forth in the Intercreditor
Agreement. The Liquidity Provider agrees that it will look solely to such
amounts to the extent available for distribution to it as provided in the
Intercreditor Agreement and this Agreement and that the Borrower, in its
individual capacity, is not personally liable to it for any amounts payable or
liability under this Agreement except as expressly provided in this Agreement,
the Intercreditor Agreement or any Participation Agreement. Amounts on deposit
in the Class B Cash Collateral Account shall be available to the Borrower to
make payments under this Agreement only to the extent and for the purposes
expressly contemplated in Section 3.6(f) of the Intercreditor Agreement.

                  Section 2.10. Extension of the Expiry Date; Non-Extension
Advance. The Expiry Date shall be automatically extended, effective on the 25th
day prior to each Expiry Date (unless such Expiry Date is on or after the date
that is 15 days after the Final Legal Distribution Date for the Class B
Certificates), for a period of 364 days after such Expiry Date (unless the
obligations of the Liquidity Provider are earlier terminated in accordance with
the terms hereof), without the necessity of any act on the part of the Borrower
or the Liquidity Provider, unless the Liquidity Provider shall advise the
Borrower prior to such 25th day that it does not agree to such extension of such
Expiry Date, in which event (and if the Liquidity Provider shall not have been
replaced in accordance with Section 3.6(e) of the Intercreditor Agreement), the
Borrower shall be entitled on and after such 25th day (but prior to such Expiry
Date) to request a Non-Extension Advance in accordance with Section 2.02(b)
hereof and Section 3.6(d) of the Intercreditor Agreement.

<PAGE>   18

                                   ARTICLE III

                           OBLIGATIONS OF THE BORROWER

                  Section 3.01. Increased Costs. The Borrower shall pay to the
Liquidity Provider from time to time such amounts as may be necessary to
compensate the Liquidity Provider for any increased costs incurred by the
Liquidity Provider which are attributable to its making or maintaining any LIBOR
Advances hereunder or its obligation to make any such Advances hereunder, or any
reduction in any amount receivable by the Liquidity Provider under this
Agreement or the Intercreditor Agreement in respect of any such Advances or such
obligation (such increases in costs and reductions in amounts receivable being
herein called "Additional Costs"), resulting from any change after the date of
this Agreement in U.S. federal, state, municipal, or foreign laws or regulations
("Regulatory Change") which changes the basis of taxation of any amounts payable
to the Liquidity Provider under this Agreement in respect of any such Advances
(other than Excluded Taxes). The Liquidity Provider agrees to use reasonable
efforts (consistent with applicable legal and regulatory restrictions) to change
the jurisdiction of its Lending Office if making such change would avoid the
need for, or reduce the amount of, any amount payable under this Section that
may thereafter accrue and would not, in the reasonable judgment of the Liquidity
Provider, be otherwise disadvantageous to the Liquidity Provider.

                  The Liquidity Provider will notify the Borrower of any event
occurring after the date of this Agreement that will entitle the Liquidity
Provider to compensation pursuant to this Section 3.01 as promptly as
practicable after it obtains knowledge thereof and determines to request such
compensation, which notice shall describe in reasonable detail the calculation
of the amounts owed under this Section. Determinations by the Liquidity Provider
for purposes of this Section 3.01 of the effect of any Regulatory Change on its
costs of making or maintaining Advances or on amounts receivable by it in
respect of Advances, and of the additional amounts required to compensate the
Liquidity Provider in respect of any Additional Costs, shall be prima facie
evidence of the amount owed under this Section.

                  Section 3.02. Capital Adequacy. If (1) the adoption, after the
date hereof, of any applicable governmental law, rule or regulation regarding
capital adequacy, (2) any change, after the date hereof, in the interpretation
or administration of any such law, rule or regulation by any central bank or
other governmental authority charged with the interpretation or administration
thereof or (3) compliance by the Liquidity Provider or any corporation
controlling the Liquidity Provider with any applicable guideline or request of
general applicability, issued after the date hereof, by any central bank or
other governmental authority (whether or not having the force of law) that
constitutes a change of the nature described in clause (2), has the effect of
requiring an increase in the amount of capital required to be maintained by the
Liquidity Provider or any corporation controlling the Liquidity Provider, and
such increase is based upon the Liquidity Provider's obligations hereunder and
other similar obligations, the Borrower shall pay to the Liquidity Provider from
time to time such additional amount or amounts as are necessary to compensate
the Liquidity Provider for such portion of such increase as shall be reasonably
allocable to the Liquidity Provider's obligations to the Borrower hereunder. The
Liquidity Provider agrees to use reasonable efforts (consistent with applicable
legal and regulatory restrictions) to change the jurisdiction of its Lending
Office if making such change would avoid


<PAGE>   19


the need for, or reduce the amount of, any amount payable under this Section
that may thereafter accrue and would not, in the reasonable judgment of the
Liquidity Provider, be otherwise materially disadvantageous to the Liquidity
Provider.

                  The Liquidity Provider will notify the Borrower of any event
occurring after the date of this Agreement that will entitle the Liquidity
Provider to compensation pursuant to this Section 3.02 as promptly as
practicable after it obtains knowledge thereof and determines to request such
compensation, which notice shall describe in reasonable detail the calculation
of the amounts owed under this Section. Determinations by the Liquidity Provider
for purposes of this Section 3.02 of the effect of any increase in the amount of
capital required to be maintained by the Liquidity Provider and of the amount
allocable to the Liquidity Provider's obligations to the Borrower hereunder
shall be prima facie evidence of the amounts owed under this Section.

                  Section 3.03. Payments Free of Deductions. (a) All payments
made by the Borrower under this Agreement shall be made free and clear of, and
without reduction for or on account of, any present or future stamp or other
taxes, levies, imposts, duties, charges, fees, deductions, withholdings,
restrictions or conditions of any nature whatsoever now or hereafter imposed,
levied, collected, withheld or assessed, excluding Excluded Taxes (such
non-excluded taxes being referred to herein, collectively, as "Non-Excluded
Taxes" and, individually, as a "Non-Excluded Tax"). If any Non-Excluded Taxes
are required to be withheld from any amounts payable to the Liquidity Provider
under this Agreement, the amounts so payable to the Liquidity Provider shall be
increased to the extent necessary to yield to the Liquidity Provider (after
payment of all Non-Excluded Taxes) interest or any other such amounts payable
under this Agreement at the rates or in the amounts specified in this Agreement.
The Liquidity Provider agrees to use reasonable efforts (consistent with its
internal policy and legal and regulatory restrictions) to change the
jurisdiction of its Lending Office if making such change would avoid the need
for, or reduce the amount of, any such additional amounts that may thereafter
accrue and would not, in the reasonable judgment of the Liquidity Provider, be
otherwise disadvantageous to the Liquidity Provider. From time to time upon the
reasonable request of the Borrower, the Liquidity Provider agrees to provide to
the Borrower two original Internal Revenue Service Forms W-8 BEN or W-8 ECI, as
appropriate, or any successor or other form prescribed by the Internal Revenue
Service, certifying that the Liquidity Provider is exempt from or entitled to a
reduced rate of United States withholding tax on payments pursuant to this
Agreement.

                  (b) All payments (including, without limitation, Advances)
made by the Liquidity Provider under this Agreement shall be made free and clear
of, and without reduction for or on account of, any Taxes. If any Taxes are
required to be withheld or deducted from any amounts payable to the Borrower
under this Agreement, the Liquidity Provider shall (i) within the time
prescribed therefor by applicable law pay to the appropriate governmental or
taxing authority the full amount of any such Taxes (and any additional Taxes in
respect of the payment required under clause (ii) hereof) and make such reports
or returns in connection therewith at the time or times and in the manner
prescribed by applicable law, and (ii) pay to the Borrower an additional amount
which (after deduction of all such Taxes) will be sufficient to yield to the
Borrower the full amount which would have been received by it had no such
withholding or deduction been made. Within 30 days after the date of each
payment hereunder, the Liquidity
<PAGE>   20
Provider shall furnish to the Borrower the original or a certified copy of (or
other documentary evidence of) the payment of the Taxes applicable to such
payment.

                  Section 3.04. Payments. The Borrower shall make or cause to be
made each payment to the Liquidity Provider under this Agreement so as to cause
the same to be received by the Liquidity Provider not later than 1:00 P.M. (New
York City time) on the day when due. The Borrower shall make all such payments
in lawful money of the United States of America, to the Liquidity Provider in
immediately available funds, by wire transfer to Citibank, N.A., New York, NY,
ABA# 021000089, Account Name: Morgan Stanley Capital Services, Inc., Account #
4072-4601, Reference: Atlas Air, Inc., 2000-1B.

                  Section 3.05. Computations. All computations of interest based
on the Base Rate shall be made on the basis of a year of 365 or 366 days, as the
case may be, and all computations of interest based on the LIBOR Rate shall be
made on the basis of a year of 360 days, in each case for the actual number of
days (including the first day but excluding the last day) occurring in the
period for which such interest is payable.

                  Section 3.06. Payment on Non-Business Days. Whenever any
payment to be made hereunder shall be stated to be due on a day other than a
Business Day, such payment shall be made on the next succeeding Business Day and
no additional interest shall be due as a result (and if so made, shall be deemed
to have been made when due). If any payment in respect of interest on an Advance
is so deferred to the next succeeding Business Day, such deferral shall not
delay the commencement of the next Interest Period for such Advance (if such
Advance is a LIBOR Advance) or reduce the number of days for which interest will
be payable on such Advance on the next interest payment date for such Advance.

                  Section 3.07. Interest. (a) Subject to Section 2.09, the
Borrower shall pay, or shall cause to be paid, without duplication, interest on
(i) the unpaid principal amount of each Advance from and including the date of
such Advance (or, in the case of an Applied Provider Advance, from and including
the date on which the amount thereof was withdrawn from the Class B Cash
Collateral Account to pay interest on the Class B Certificates) to but excluding
the date such principal amount shall be paid in full (or, in the case of an
Applied Provider Advance, the date on which the Class B Cash Collateral Account
is fully replenished in respect of such Advance) and (ii) any other amount due
hereunder (whether fees, commissions, expenses or other amounts or, to the
extent permitted by law, installments of interest on Advances or any such other
amount) which is not paid when due (whether at stated maturity, by acceleration
or otherwise) from and including the due date thereof to but excluding the date
such amount is paid in full, in each such case, at a fluctuating interest rate
per annum for each day equal to the Applicable Liquidity Rate (as defined below)
for such Advance or such other amount as in effect for such day, but in no event
at a rate per annum greater than the maximum rate permitted by applicable law;
provided, however, that, if at any time the otherwise applicable interest rate
as set forth in this Section 3.07 shall exceed the maximum rate permitted by
applicable law, then any subsequent reduction in such interest rate will not
reduce the rate of interest payable pursuant to this Section 3.07 below the
maximum rate permitted by applicable law until the total amount of interest
accrued equals the amount of interest that would have accrued if such otherwise
applicable interest rate as set forth in this Section 3.07 had at all times been
in effect.

<PAGE>   21

                  (b) Each Advance will be either a Base Rate Advance or a LIBOR
Advance as provided in this Section. Each such Advance will be a Base Rate
Advance for the period from the date of its borrowing to (but excluding) the
third Business Day following the Liquidity Provider's receipt of the Notice of
Borrowing for such Advance. Thereafter, such Advance shall be a LIBOR Advance;
provided that the Borrower (at the direction of the Controlling Party, so long
as the Liquidity Provider is not the Controlling Party) may (x) convert the
Final Advance into a Base Rate Advance on the last day of an Interest Period for
such Advance by giving the Liquidity Provider no less than four Business Days'
prior written notice of such election or (y) elect to maintain the Final Advance
as a Base Rate Advance by not requesting a conversion of the Final Advance to a
LIBOR Advance under Clause (5) of the applicable Notice of Borrowing (or, if
such Final Advance is deemed to have been made without delivery of a Notice of
Borrowing pursuant to Section 2.06, by requesting, prior to 11:00 AM on the
first Business Day immediately following the Borrower's receipt of the
applicable Termination Notice, such that such Final Advance not be converted
from a Base Rate Advance to a LIBOR Advance).

                  (c) Each LIBOR Advance shall bear interest during each
Interest Period at a rate per annum equal to the LIBOR Rate for such Interest
Period plus the Applicable Margin for such LIBOR Advance, payable in arrears on
the last day of such Interest Period and, in the event of the payment of
principal of such LIBOR Advance on a day other than such last day, on the date
of such payment (to the extent of interest accrued on the amount of principal
repaid).

                  (d) Each Base Rate Advance shall bear interest at a rate per
annum equal to the Base Rate plus the Applicable Margin for such Base Rate
Advance, payable in arrears on each Regular Distribution Date and, in the event
of the payment of principal of such Base Rate Advance on a day other than a
Regular Distribution Date, on the date of such payment (to the extent of
interest accrued on the amount of principal repaid).

                  (e) Each Unapplied Provider Advance shall bear interest as
provided in Section 3.07(b) hereof plus an amount equal to the amount by which
(i) the Investment Earnings plus 0.50% per annum on the outstanding amount from
time to time of such Advance for the period for which interest is calculated
pursuant to clause (ii) hereof exceeds (ii) the amount of interest on such
Unapplied Provider Advance under Section 3.07(b). . (f) Each amount not paid by
the Borrower when due hereunder (whether fees, commissions, expenses or other
amounts or, to the extent permitted by applicable law, installments of interest
on Advances but excluding Advances) shall bear interest at a rate per annum
equal to the Base Rate plus 2.00% until paid.

                  (g) Each change in the Base Rate shall become effective
immediately. The rates of interest specified in this Section 3.07 with respect
to any Advance or other amount shall be referred to as the "Applicable Liquidity
Rate".

                  Section 3.08. Replacement of Borrower. From time to time and
subject to the successor Borrower's meeting the eligibility requirements set
forth in Section 6.9 of the

<PAGE>   22

Intercreditor Agreement applicable to the Subordination Agent, upon the
effective date and time specified in a written and completed Notice of
Replacement Subordination Agent in substantially the form of Annex V attached
hereto (a "Notice of Replacement Subordination Agent") delivered to the
Liquidity Provider by the then Borrower, the successor Borrower designated
therein shall be substituted for as the Borrower for all purposes hereunder.

                  Section 3.09. Funding Loss Indemnification. The Borrower shall
pay to the Liquidity Provider, upon the request of the Liquidity Provider, such
amount or amounts as shall be sufficient (in the reasonable opinion of the
Liquidity Provider) to compensate it for any loss, cost, or expense incurred by
reason of the liquidation or redeployment of deposits or other funds acquired by
the Liquidity Provider to fund or maintain any LIBOR Advance (but excluding loss
of anticipated profits) incurred as a result of:

                  (1) Any repayment of a LIBOR Advance on a date other than the
         last day of the Interest Period for such Advance; or

                  (2) Any failure by the Borrower to borrow a LIBOR Advance on
         the date for borrowing specified in the relevant notice under Section
         2.02.

                  Section 3.10. Illegality. Notwithstanding any other provision
in this Agreement, if any change in any applicable law, rule or regulation, or
any change in the interpretation or administration thereof by any governmental
authority, central bank or comparable agency charged with the interpretation or
administration thereof, or compliance by the Liquidity Provider (or its Lending
Office) with any request or directive (whether or not having the force of law)
of any such authority, central bank or comparable agency shall make it unlawful
or impossible for the Liquidity Provider (or its Lending Office) to maintain or
fund its LIBOR Advances, then upon notice to the Borrower by the Liquidity
Provider, the outstanding principal amount of the LIBOR Advances shall be
converted to Base Rate Advances (a) immediately upon demand of the Liquidity
Provider, if such change or compliance with such request, in the judgment of the
Liquidity Provider, requires immediate repayment; or (b) at the expiration of
the last Interest Period to expire before the effective date of any such change
or request.


                                   ARTICLE IV

                              CONDITIONS PRECEDENT

                  Section 4.01. Conditions Precedent to Effectiveness of Section
2.01. Section 2.01 of this Agreement shall become effective on and as of the
first date (the "Effective Date") on which the following conditions precedent
have been satisfied or waived:

                  (a) The Liquidity Provider shall have received on or before
the Closing Date each of the following, and in the case of each document
delivered pursuant to paragraphs (i), (ii) and (iii), each in form and substance
satisfactory to the Liquidity Provider:

<PAGE>   23

                  (i) This Agreement duly executed on behalf of the Borrower;

                  (ii) The Intercreditor Agreement duly executed on behalf of
         each of the parties thereto;

                  (iii) Fully executed copies of each of the Operative
         Agreements executed and delivered on or before the Closing Date (other
         than this Agreement and the Intercreditor Agreement);

                  (iv) A copy of the Offering Memorandum, and specimen copies of
         the Class B Certificates;

                  (v) An executed copy of each document, instrument, certificate
         and opinion delivered on or before the Closing Date pursuant to the
         Class B Trust Agreement, the Intercreditor Agreement and the other
         Operative Agreements (in the case of each such opinion, other than the
         opinion of counsel for the Placement Agents, either addressed to the
         Liquidity Provider or accompanied by a letter from the counsel
         rendering such opinion to the effect that the Liquidity Provider is
         entitled to rely on such opinion as of its date as if it were addressed
         to the Liquidity Provider);

                  (vi) Evidence that there shall have been made and shall be in
         full force and effect, all filings, recordings and/or registrations,
         and there shall have been given or taken any notice or other similar
         action as may be reasonably necessary or, to the extent reasonably
         requested by the Liquidity Provider, reasonably advisable, in order to
         establish, perfect, protect and preserve the right, title and interest,
         remedies, powers, privileges, liens and security interests of, or for
         the benefit of, the Trustees, the Borrower and the Liquidity Provider
         created by the Operative Agreements executed and delivered on or prior
         to the Closing Date;

                  (vii) An agreement from Atlas, pursuant to which (i) Atlas
         agrees to provide copies of quarterly financial statements and audited
         annual financial statements to the Liquidity Provider, and such other
         information as the Liquidity Provider shall reasonably request with
         respect to the transactions contemplated by the Operative Agreements,
         in each case, only to the extent that Atlas is obligated to provide
         such information pursuant to Section 8.2.1 of the Leases (related to
         Leased Aircraft) or the corresponding section of the Indentures
         (related to Owned Aircraft) to the parties thereto and (ii) Atlas
         agrees to allow the Liquidity Provider to inspect Atlas's books and
         records regarding such transactions, and to discuss such transactions
         with officers and employees of Atlas; and

                  (viii) Such other documents, instruments, opinions and
         approvals pertaining to the transactions contemplated hereby or by the
         other Operative Agreements as the Liquidity Provider shall have
         reasonably requested.

<PAGE>   24

                  (b) The following statement shall be true on and as of the
Effective Date: No event has occurred and is continuing, or would result from
the entering into of this Agreement or the making of any Advance, which
constitutes a Liquidity Event of Default.

                  (c) The Liquidity Provider shall have received payment in full
of all fees and other sums required to be paid to or for the account of the
Liquidity Provider on or prior to the Effective Date.

                  (d) All conditions precedent to the issuance of the
Certificates under the Trust Agreements shall have been satisfied or waived, all
conditions precedent to the effectiveness of the other Liquidity Facilities
shall have been satisfied or waived, and all conditions precedent to the
purchase of the Certificates by the Placement Agents under the Placement
Agreement shall have been satisfied (unless any of such conditions precedent
shall have been waived by the Placement Agents).

                  (e) The Borrower shall have received on or before the Closing
Date each of the following:

                  (i) The Guarantee Agreement, substantially in the form of
         Exhibit I hereto, duly executed on behalf of each of the parties
         thereto;

                  (ii) A certificate, dated the date hereof, signed by a duly
         authorized representative of the Liquidity Provider, certifying that
         all conditions precedent to the effectiveness of Section 2.01 have been
         satisfied or waived.

                  Section 4.02. Conditions Precedent to Borrowing. The
obligation of the Liquidity Provider to make an Advance on the occasion of each
Borrowing shall be subject to the conditions precedent that the Effective Date
shall have occurred and, prior to the date of such Borrowing, the Borrower shall
have delivered a Notice of Borrowing which conforms to the terms and conditions
of this Agreement and has been completed as may be required by the relevant form
of the Notice of Borrowing for the type of Advances requested.


<PAGE>   25

                                    ARTICLE V

                                    COVENANTS

                  Section 5.01. Affirmative Covenants of the Borrower. So long
as any Advance shall remain unpaid or the Liquidity Provider shall have any
Maximum Commitment hereunder or the Borrower shall have any obligation to pay
any amount to the Liquidity Provider hereunder, the Borrower will, unless the
Liquidity Provider shall otherwise consent in writing:

                   (a) Performance of This and Other Agreements. Punctually pay
         or cause to be paid all amounts payable by it under this Agreement and
         the other Operative Agreements and observe and perform in all material
         respects the conditions, covenants and requirements applicable to it
         contained in this Agreement and the other Operative Agreements.

                  (b) Reporting Requirements. Furnish to the Liquidity Provider
         with reasonable promptness, such other information and data with
         respect to the transactions contemplated by the Operative Agreements as
         from time to time may be reasonably requested by the Liquidity
         Provider; and permit the Liquidity Provider, upon reasonable notice, to
         inspect the Borrower's books and records with respect to such
         transactions and to meet with officers and employees of the Borrower to
         discuss such transactions.

                  (c) Certain Operative Agreements. Furnish to the Liquidity
         Provider with reasonable promptness such Operative Agreements entered
         into after the date hereof as from time to time may be reasonably
         requested by the Liquidity Provider.

                  Section 5.02. Negative Covenants of the Borrower. So long as
any Advance shall remain unpaid or the Liquidity Provider shall have any Maximum
Commitment hereunder or the Borrower shall have any obligation to pay any amount
to the Liquidity Provider hereunder, the Borrower will not appoint or permit or
suffer to be appointed any successor Borrower without the prior written consent
of the Liquidity Provider, which consent shall not be unreasonably withheld or
delayed.


                                   ARTICLE VI

                           LIQUIDITY EVENTS OF DEFAULT

                  Section 6.01. Liquidity Events of Default. If (a) any
Liquidity Event of Default has occurred and is continuing and (b) there is a
Performing Note Deficiency, the Liquidity Provider may, in its discretion,
deliver to the Borrower a Termination Notice, the effect of which shall be to
cause (i) this Agreement to expire on the fifth Business Day after the date on
which such Termination Notice is received by the Borrower, (ii) the Borrower to
promptly request, and the Liquidity Provider to promptly make, a Final Advance
in accordance with Section 2.02(d) hereof and Section 3.6(i) of the
Intercreditor Agreement, (iii) all other outstanding Advances to

<PAGE>   26

be automatically converted into Final Advances for purposes of determining the
Applicable Liquidity Rate for interest payable thereon, and (iv) subject to
Sections 2.07 and 2.09 hereof, all Advances (including, without limitation, any
Provider Advance and Applied Provider Advance), any accrued interest thereon and
any other amounts outstanding hereunder to become immediately due and payable to
the Liquidity Provider.


                                   ARTICLE VII

                                  MISCELLANEOUS

                  Section 7.01. Amendments, Etc., No amendment or waiver of any
provision of this Agreement, nor consent to any departure by the Borrower
therefrom, shall in any event be effective unless the same shall be in writing
and signed by the Liquidity Provider, and, in the case of an amendment or of a
waiver by the Borrower, the Borrower, and then such waiver or consent shall be
effective only in the specific instance and for the specific purpose for which
given.

                  Section 7.02. Notices, Etc. Except as otherwise expressly
provided herein, all notices and other communications provided for hereunder
shall be in writing (including telecopier and mailed or delivered or sent by
telecopier):

                  Borrower:         WILMINGTON TRUST COMPANY
                                    One Rodney Square
                                    1100 North Market Street
                                    Wilmington, DE 19890-0001

                                    Attention:  Corporate Trust Administration
                                    Telecopy:    (302) 651-8882

                  Liquidity
                  Provider:         MORGAN STANLEY CAPITAL SERVICES, INC.
                                    1585 Broadway
                                    New York, NY  10036

                                    Attention:  Keith Amburgey
                                    Telecopy:  (212) 761-0580

or, as to each of the foregoing, at such other address as shall be designated by
such Person in a written notice to the others. All such notices and
communications shall be effective (i) if given by telecopier, when transmitted
to the telecopier number specified above, (ii) if given by mail, when deposited
in the mails addressed as specified above, and (iii) if given by other means,
when delivered at the address specified above, except that written notices to
the Liquidity Provider pursuant to the provisions of Articles II and III hereof
shall not be effective until received by the Liquidity Provider. A copy of all
notices delivered hereunder to either party shall in addition be delivered to
each of the parties to the Participation Agreements at their respective
addresses set forth therein.

<PAGE>   27

                  Section 7.03. No Waiver: Remedies. No failure on the part of
the Liquidity Provider to exercise, and no delay in exercising, any right under
this Agreement shall operate as a waiver thereof; nor shall any single or
partial exercise of any right under this Agreement preclude any other or further
exercise thereof or the exercise of any other right. The remedies herein
provided are cumulative and not exclusive of any remedies provided by law.

                  Section 7.04. Further Assurances. The Borrower agrees to do
such further acts and things and to execute and deliver to the Liquidity
Provider such additional assignments, agreements, powers and instruments as the
Liquidity Provider may reasonably require or deem advisable to carry into effect
the purposes of this Agreement and the other Operative Agreements or to better
assure and confirm unto the Liquidity Provider its rights, powers and remedies
hereunder and under the other Operative Agreements.

                  Section 7.05. Indemnification; Survival of Certain Provisions.
The Liquidity Provider shall be indemnified hereunder to the extent and in the
manner described in Section 9.1 of the Leased Aircraft Participation Agreement,
Section 8.1 of the Owned Aircraft Participation Agreement and Section 6 of the
Note Purchase Agreement. In addition, the Borrower agrees to indemnify, protect,
defend and hold harmless the Liquidity Provider from, against and in respect of,
and shall pay on demand, all Expenses of any kind or nature whatsoever (other
than any Expenses of the nature described in Sections 3.01, 3.02 or 7.07 hereof
or in the MSCS Fee Letter (regardless of whether indemnified against pursuant to
said Sections or in such MSCS Fee Letter)), that may be imposed, incurred by or
asserted against any Liquidity Indemnitee, in any way relating to, resulting
from, or arising out of or in connection with any action, suit or proceeding by
any third party against such Liquidity Indemnitee and relating to this
Agreement, the MSCS Fee Letter, the Intercreditor Agreement or any Financing
Agreement; provided, however, that the Borrower shall not be required to
indemnify, protect, defend and hold harmless any Liquidity Indemnitee in respect
of any Expense of such Liquidity Indemnitee (i) to the extent such Expense is
attributable to the gross negligence or willful misconduct of such Liquidity
Indemnitee or any other Liquidity Indemnitee, (ii) ordinary and usual operating
overhead expense, or (iii) attributable to the failure by such Liquidity
Indemnitee or any other Liquidity Indemnitee to perform or observe any
agreement, covenant or condition on its part to be performed or observed in this
Agreement, the Intercreditor Agreement, the MSCS Fee Letter or any other
Operative Agreement to which it is a party. The indemnities contained in Section
9.1 or 8.1, as the case may be, of the Participation Agreements, and the
provisions of Sections 3.01, 3.02, 3.03, 3.09, 7.05 and 7.07 hereof, shall
survive the termination of this Agreement.

                  Section 7.06. Liability of the Liquidity Provider. (a) Neither
the Liquidity Provider nor any of its officers, employees, directors or
affiliates shall be liable or responsible for: (i) the use which may be made of
the Advances or any acts or omissions of the Borrower or any beneficiary or
transferee in connection therewith; (ii) the validity, sufficiency or
genuineness of documents, or of any endorsement thereon, even if such documents
should prove to be in any or all respects invalid, insufficient, fraudulent or
forged; or (iii) the making of Advances by the Liquidity Provider against
delivery of a Notice of Borrowing and other documents which do not comply with
the terms hereof; provided, however, that the Borrower shall have a claim
against


<PAGE>   28

the Liquidity Provider, and the Liquidity Provider shall be liable to the
Borrower, to the extent of any damages suffered by the Borrower which were the
result of (A) the Liquidity Provider's willful misconduct or negligence in
determining whether documents presented hereunder comply with the terms hereof,
or (B) any breach by the Liquidity Provider of any of the terms of this
Agreement, including, but not limited to, the Liquidity Provider's failure to
make lawful payment hereunder after the delivery to it by the Borrower of a
Notice of Borrowing strictly complying with the terms and conditions hereof.

                  (b) Neither the Liquidity Provider nor any of its officers,
employees, director or affiliates shall be liable or responsible in any respect
for (i) any error, omission, interruption or delay in transmission, dispatch or
delivery of any message or advice, however transmitted, in connection with this
Agreement or any Notice of Borrowing delivered hereunder, or (ii) any action,
inaction or omission which may be taken by it in good faith, absent willful
misconduct or negligence (in which event the extent of the Liquidity Provider's
potential liability to the Borrower shall be limited as set forth in the
immediately preceding paragraph), in connection with this Agreement or any
Notice of Borrowing.

                  Section 7.07. Costs, Expenses and Taxes. The Borrower agrees
to pay, or cause to be paid (A) on the Effective Date and on such later date or
dates on which the Liquidity Provider shall make demand, all reasonable
out-of-pocket costs and expenses (including, without limitation, the reasonable
fees and expenses of outside counsel for the Liquidity Provider) of the
Liquidity Provider in connection with the preparation, negotiation, execution,
delivery, filing and recording of this Agreement, any other Operative Agreement
and any other documents which may be delivered in connection with this Agreement
and (B) on demand, all reasonable costs and expenses (including reasonable
counsel fees and expenses) of the Liquidity Provider in connection with (i) the
enforcement of this Agreement or any other Operative Agreement, (ii) the
modification or amendment of, or supplement to, this Agreement or any other
Operative Agreement or such other documents which may be delivered in connection
herewith or therewith (whether or not the same shall become effective) or (iii)
any action or proceeding relating to any order, injunction, or other process or
decree restraining or seeking to restrain the Liquidity Provider from paying any
amount under this Agreement, the Intercreditor Agreement or any other Operative
Agreement or otherwise affecting the application of funds in the Class B Cash
Collateral Account. In addition, the Borrower shall pay any and all recording,
stamp and other similar taxes and fees payable or determined to be payable in
connection with the execution, delivery, filing and recording of this Agreement,
any other Operative Agreement and such other documents, and agrees to save the
Liquidity Provider harmless from and against any and all liabilities with
respect to or resulting from any delay in paying or omission to pay such taxes
or fees.

                  Section 7.08. Binding Effect; Participations.

                  (a) This Agreement shall be binding upon and inure to the
benefit of the Borrower and the Liquidity Provider and their respective
successors and assigns, except that neither the Liquidity Provider (except as
otherwise provided in this Section 7.08) nor (except as contemplated by Section
3.08) the Borrower shall have the right to assign its rights or obligations

<PAGE>   29


hereunder or any interest herein without the prior written consent of the other
party, subject to the requirements of Section 7.08(b). The Liquidity Provider
may grant participations herein or in any of its rights hereunder (including,
without limitation, funded participations and participations in rights to
receive interest payments hereunder) and under the other Operative Agreements to
such Persons as (not including Atlas or any affiliate of Atlas) the Liquidity
Provider may in its sole discretion select, subject to the requirements of
Section 7.08(b). No such participation by the Liquidity Provider, however, will
relieve the Liquidity Provider of its obligations hereunder. In connection with
any participation or any proposed participation, the Liquidity Provider may
disclose to the participant or the proposed participant any information that the
Borrower is required to deliver or to disclose to the Liquidity Provider
pursuant to this Agreement. The Borrower acknowledges and agrees that the
Liquidity Provider's source of funds may derive in part from its participants.
Accordingly, references in this Agreement and the other Operative Agreements to
determinations, reserve and capital adequacy requirements, increased costs,
reduced receipts, additional amounts due pursuant to Section 3.03(a) and the
like as they pertain to the Liquidity Provider shall be deemed also to include
those of each of its participants (subject, in each case, to the maximum amount
that would have been incurred by or attributable to the Liquidity Provider
directly if the Liquidity Provider, rather than the participant, had held the
interest participated).

                  (b) If, pursuant to subsection (a) above, the Liquidity
Provider sells any participation in this Agreement to any bank or other entity
(each, a "Transferee"), then, concurrently with the effectiveness of such
participation, the Transferee shall (i) represent to the Liquidity Provider (for
the benefit of the Liquidity Provider and the Borrower) either (A) that it is
incorporated under the laws of the United States or a state thereof or (B) that
under applicable law and treaties, no taxes will be required to be withheld with
respect to any payments to be made to such Transferee in respect of this
Agreement, (ii) furnish to the Liquidity Provider and the Borrower either (x) a
statement that it is incorporated under the laws of the United States or a state
thereof or (y) if it is not so incorporated, two copies of a properly completed
United States Internal Revenue Service Form W-8 ECI or Form W-8 BEN, as
appropriate, or other applicable form, certificate or document prescribed by the
Internal Revenue Service certifying, in each case, such Transferee's entitlement
to a complete exemption from United States federal withholding tax in respect to
any and all payments to be made hereunder, and (iii) agree (for the benefit of
the Liquidity Provider and the Borrower) to provide the Liquidity Provider and
the Borrower a new Form W-8 ECI or Form W-8 BEN, as appropriate, (A) on or
before the date that any such form expires or becomes obsolete or (B) after the
occurrence of any event requiring a change in the most recent form previously
delivered by it and prior to the immediately following due date of any payment
by the Borrower hereunder, certifying in the case of a Form W-8 BEN or Form W-8
ECI that such Transferee is entitled to a complete exemption from United States
federal withholding tax on payments under this Agreement. Unless the Borrower
has received forms or other documents reasonably satisfactory to it (and
required by applicable law) indicating that payments hereunder are not subject
to United States federal withholding tax, the Borrower will withhold taxes as
required by law from such payments at the applicable statutory rate.

                  Section 7.09. Severability. Any provision of this Agreement
which is prohibited, unenforceable or not authorized in any jurisdiction shall,
as to such jurisdiction, be ineffective to

<PAGE>   30

the extent of such prohibition, unenforceability or nonauthorization without
invalidating the remaining provisions hereof or affecting the validity,
enforceability or legality of such provision in any other jurisdiction.

                  Section 7.10. GOVERNING LAW. THIS AGREEMENT SHALL BE GOVERNED
BY, AND CONSTRUED IN ACCORDANCE WITH, THE LAW OF THE STATE OF NEW YORK.

                  Section 7.11. Submission to Jurisdiction; Waiver of Jury
Trial; Waiver of Immunity. (a) Each of the parties hereto hereby irrevocably and
unconditionally:

         (i)      submits for itself and its property in any legal action or
                  proceeding relating to this Agreement or any other Operative
                  Agreement, or for recognition and enforcement of any judgment
                  in respect hereof or thereof, to the nonexclusive general
                  jurisdiction of the courts of the State of New York, the
                  courts of the United States of America for the Southern
                  District of New York, and the appellate courts from any
                  thereof;

         (ii)     consents that any such action or proceeding may be brought in
                  such courts, and waives any objection that it may now or
                  hereafter have to the venue of any such action or proceeding
                  in any such court or that such action or proceeding was
                  brought in an inconvenient court and agrees not to plead or
                  claim the same;

         (iii)    agrees that service of process in any such action or
                  proceeding may be effected by mailing a copy thereof by
                  registered or certified mail (or any substantially similar
                  form and mail), postage prepaid, to each party hereto at its
                  address set forth in Section 7.02 hereof, or at such other
                  address of which the Liquidity Provider shall have been
                  notified pursuant thereto; and

         (iv)     agrees that nothing herein shall affect the right to effect
                  service of process in any other manner permitted by law or
                  shall limit the right to sue in any other jurisdiction.

                  (b) THE BORROWER AND THE LIQUIDITY PROVIDER EACH HEREBY AGREE
TO WAIVE THEIR RESPECTIVE RIGHTS TO A JURY TRIAL OF ANY CLAIM OR CAUSE OF ACTION
BASED UPON OR ARISING OUT OF THIS AGREEMENT OR ANY DEALINGS BETWEEN THEM
RELATING TO THE SUBJECT MATTER OF THIS AGREEMENT AND THE RELATIONSHIP THAT IS
BEING ESTABLISHED, including, without limitation, contract claims, tort claims,
breach of duty claims and all other common law and statutory claims. The
Borrower and the Liquidity Provider each warrant and represent that it has
reviewed this waiver with its legal counsel, and that it knowingly and
voluntarily waives its jury trial rights following consultation with such legal
counsel. THIS WAIVER IS IRREVOCABLE, AND CANNOT BE MODIFIED EITHER ORALLY OR IN
WRITING, AND THIS WAIVER SHALL APPLY TO ANY SUBSEQUENT AMENDMENTS, RENEWALS,
SUPPLEMENTS OR MODIFICATIONS TO THIS AGREEMENT.

<PAGE>   31

                  Section 7.12. Execution in Counterparts. This Agreement may be
executed in any number of counterparts and by different parties hereto on
separate counterparts, each of which counterparts, when so executed and
delivered, shall be deemed to be an original and all of which counterparts,
taken together, shall constitute but one and the same Agreement.

                  Section 7.13. Entirety. This Agreement, the Intercreditor
Agreement and the other Operative Agreements to which the Liquidity Provider is
a party constitute the entire agreement of the parties hereto with respect to
the subject matter hereof and supersedes all prior understandings and agreements
of such parties.

                  Section 7.14. Headings. Section headings in this Agreement are
included herein for convenience of reference only and shall not constitute a
part of this Agreement for any other purpose.

                  Section 7.15. LIQUIDITY PROVIDER'S OBLIGATION TO MAKE
ADVANCES. EXCEPT AS EXPRESSLY SET FORTH IN THIS AGREEMENT, THE OBLIGATIONS OF
THE LIQUIDITY PROVIDER TO MAKE ADVANCES HEREUNDER, AND THE BORROWER'S RIGHTS TO
DELIVER NOTICES OF BORROWING REQUESTING THE MAKING OF ADVANCES HEREUNDER, SHALL
BE UNCONDITIONAL AND IRREVOCABLE, AND SHALL BE PAID OR PERFORMED, IN EACH CASE
STRICTLY IN ACCORDANCE WITH THE TERMS OF THIS AGREEMENT.



<PAGE>   32



                  IN WITNESS WHEREOF, the parties have caused this Agreement to
be duly executed and delivered by their respective officers thereunto duly
authorized as of the date first set forth above.

                                    WILMINGTON TRUST COMPANY, not in its
                                    individual capacity but solely as
                                    Subordination Agent, as agent and trustee
                                    for the Class B Trust, as Borrower

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


                                    MORGAN STANLEY CAPITAL SERVICES, INC.,
                                    as Liquidity Provider


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





<PAGE>   33



         Annex I to
         Revolving Credit Agreement


                      INTEREST ADVANCE NOTICE OF BORROWING

                  The undersigned, a duly authorized signatory of the
undersigned borrower (the "Borrower"), hereby certifies to Morgan Stanley
Capital Services, Inc. (the "Liquidity Provider"), with reference to the
Revolving Credit Agreement (2000-lB) dated as of January 28, 2000, between the
Borrower and the Liquidity Provider (the "Liquidity Agreement"; the terms
defined therein and not otherwise defined herein being used herein as therein
defined or referenced), that:

                  (1) The Borrower is the Subordination Agent under the
         Intercreditor Agreement.

                  (2) The Borrower is delivering this Notice of Borrowing for
         the making of an Interest Advance by the Liquidity Provider to be used,
         subject to clause (3)(v) below, for the payment of the interest on the
         Class B Certificates which was payable on ________________, ______ (the
         "Distribution Date") in accordance with the terms and provisions of the
         Class B Trust Agreement and the Class B Certificates which Advance is
         requested to be made on ________________, ______.

                  (3) The amount of the Interest Advance requested hereby (i) is
         $ _______, to be applied in respect of the payment of the interest
         which was due and payable on the Class B Certificates on the
         Distribution Date, (ii) does not include any amount with respect to the
         payment of principal of, or premium on, the Class A Certificates, the
         Class B Certificates or the Class C Certificates, or interest on the
         Class A Certificates or the Class C Certificates, (iii) was computed in
         accordance with the provisions of the Class B Certificates, the Class B
         Trust Agreement and the Intercreditor Agreement (a copy of which
         computation is attached hereto as Schedule I), (iv) does not exceed the
         Maximum Commitment on the date hereof, (v) does not include any amount
         of interest which was due and payable on the Class B Certificates on
         such Distribution Date but which remains unpaid due to the failure of
         the Depositary to pay any amount of accrued interest on the
         Certificates of Deposit on such Distribution Date and (vi) has not been
         and is not the subject of a prior or contemporaneous Notice of
         Borrowing.

                  (4) Upon receipt by or on behalf of the Borrower of the amount
         requested hereby, (a) the Borrower will apply the same in accordance
         with the terms of Section 3.6(b) of the Intercreditor Agreement, (b) no
         portion of such amount shall be applied by the Borrower for any other
         purpose and (c) no portion of such amount until so applied shall be
         commingled with other funds held by the Borrower.

                  The Borrower hereby acknowledges that, pursuant to the
Liquidity Agreement, the making of the Interest Advance as requested by this
Notice of Borrowing shall automatically reduce, subject to reinstatement in
accordance with the terms of the Liquidity Agreement, the

<PAGE>   34

Maximum Commitment by an amount equal to the amount of the Interest Advance
requested to be made hereby as set forth in clause (i) of paragraph (3) of this
Certificate and such reduction shall automatically result in corresponding
reductions in the amounts available to be borrowed pursuant to a subsequent
Advance.

                  IN WITNESS WHEREOF, the Borrower has executed and delivered
this Notice of Borrowing as of the __ day of ________________, _____.


                                    WILMINGTON TRUST COMPANY, not in its
                                    individual capacity but solely as
                                    Subordination Agent, as agent and trustee
                                    for the Class B Trust, as Borrower

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



<PAGE>   35



               SCHEDULE I TO INTEREST ADVANCE NOTICE OF BORROWING

                 [Insert Copy of Computations in accordance with
                      Interest Advance Notice of Borrowing]



<PAGE>   36



         Annex II to
         Revolving Credit Agreement


                    NON-EXTENSION ADVANCE NOTICE OF BORROWING

                  The undersigned, a duly authorized signatory of the
undersigned subordination agent (the "Borrower"), hereby certifies to Morgan
Stanley Capital Services, Inc. (the "Liquidity Provider"), with reference to the
Revolving Credit Agreement (2000-lB) dated as of January 28, 2000, between the
Borrower and the Liquidity Provider (the "Liquidity Agreement"; the terms
defined therein and not otherwise defined herein being used herein as therein
defined or referenced), that:

                  (1) The Borrower is the Subordination Agent under the
         Intercreditor Agreement.

                  (2) The Borrower is delivering this Notice of Borrowing for
         the making of the Non-Extension Advance by the Liquidity Provider to be
         used for the funding of the Class B Cash Collateral Account in
         accordance with Section 3.6(d) of the Intercreditor Agreement, which
         Advance is requested to be made on __________, ____.

                  (3) The amount of the Non-Extension Advance requested hereby
         (i) is $________.____, which equals the Maximum Commitment on the date
         hereof and is to be applied in respect of the funding of the Class B
         Cash Collateral Account in accordance with Section 3.6(d) of the
         Intercreditor Agreement, (ii) does not include any amount with respect
         to the payment of the principal of, or premium on, the Class B
         Certificates, or principal of, or interest or premium on, the Class A
         Certificates or the Class C Certificates, (iii) was computed in
         accordance with the provisions of the Class B Certificates, the Class B
         Trust Agreement and the Intercreditor Agreement (a copy of which
         computation is attached hereto as Schedule I), and (iv) has not been
         and is not the subject of a prior or contemporaneous Notice of
         Borrowing under the Liquidity Agreement.

                  (4) Upon receipt by or on behalf of the Borrower of the amount
         requested hereby, (a) the Borrower will deposit such amount in the
         Class B Cash Collateral Account and apply the same in accordance with
         the terms of Section 3.6(d) of the Intercreditor Agreement, (b) no
         portion of such amount shall be applied by the Borrower for any other
         purpose and (c) no portion of such amount until so applied shall be
         commingled with other funds held by the Borrower.


                  The Borrower hereby acknowledges that, pursuant to the
Liquidity Agreement, (A) the making of the Non-Extension Advance as requested by
this Notice of Borrowing shall automatically and irrevocably terminate the
obligation of the Liquidity Provider to make further Advances under the
Liquidity Agreement; and (B) following the making by the Liquidity

<PAGE>   37

Provider of the Non-Extension Advance requested by this Notice of Borrowing, the
Borrower shall not be entitled to request any further Advances under the
Liquidity Agreement.

                  IN WITNESS WHEREOF, the Borrower has executed and delivered
this Notice of Borrowing as of the ___ day of _________________,____.


                                    WILMINGTON TRUST COMPANY, not in its
                                      individual capacity but solely as
                                      Subordination Agent, as agent and trustee
                                      for the Class B Trust, as Borrower

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



<PAGE>   38



             SCHEDULE I TO NON-EXTENSION ADVANCE NOTICE OF BORROWING

                 [Insert Copy of computations in accordance with
                   Non-Extension Advance Notice of Borrowing]



<PAGE>   39



         Annex III to
         Revolving Credit Agreement


                      DOWNGRADE ADVANCE NOTICE OF BORROWING

                  The undersigned, a duly authorized signatory of the
undersigned subordination agent (the "Borrower"), hereby certifies to Morgan
Stanley Capital Services, Inc. (the "Liquidity Provider"), with reference to the
Revolving Credit Agreement (2000-lB) dated as of January 28, 2000, between the
Borrower and the Liquidity Provider (the "Liquidity Agreement"; the terms
defined therein and not otherwise defined herein being used herein as therein
defined or referenced), that:

                  (1) The Borrower is the Subordination Agent under the
         Intercreditor Agreement.

                  (2) The Borrower is delivering this Notice of Borrowing for
         the making of the Downgrade Advance by the Liquidity Provider to be
         used for the funding of the Class B Cash Collateral Account in
         accordance with Section 3.6(c) of the Intercreditor Agreement by reason
         of (i) the downgrading of the short-term unsecured debt rating of the
         Guarantor issued by any Rating Agency below the Threshold Rating or
         (ii) the occurrence of a Guarantee Event, which Advance is requested to
         be made on __________, ____.

                  (3) The amount of the Downgrade Advance requested hereby (i)
         is $________.____, which equals the Maximum Commitment on the date
         hereof and is to be applied in respect of the funding of the Class B
         Cash Collateral Account in accordance with Section 3.6(c) of the
         Intercreditor Agreement, (ii) does not include any amount with respect
         to the payment of the principal of, or premium on, the Class B
         Certificates, or principal of, or interest or premium on, the Class A
         Certificates or the Class C Certificates, (iii) was computed in
         accordance with the provisions of the Class B Certificates, the Class B
         Trust Agreement and the Intercreditor Agreement (a copy of which
         computation is attached hereto as Schedule I), and (iv) has not been
         and is not the subject of a prior or contemporaneous Notice of
         Borrowing under the Liquidity Agreement.

                  (4) Upon receipt by or on behalf of the Borrower of the amount
         requested hereby, (a) the Borrower will deposit such amount in the
         Class B Cash Collateral Account and apply the same in accordance with
         the terms of Section 3.6(c) of the Intercreditor Agreement, (b) no
         portion of such amount shall be applied by the Borrower for any other
         purpose and (c) no portion of such amount until so applied shall be
         commingled with other funds held by the Borrower.

                  The Borrower hereby acknowledges that, pursuant to the
Liquidity Agreement, (A) the making of the Downgrade Advance as requested by
this Notice of Borrowing shall automatically and irrevocably terminate the
obligation of the Liquidity Provider to make further


<PAGE>   40

Advances under the Liquidity Agreement; and (B) following the making by the
Liquidity Provider of the Downgrade Advance requested by this Notice of
Borrowing, the Borrower shall not be entitled to request any further Advances
under the Liquidity Agreement.

                  IN WITNESS WHEREOF, the Borrower has executed and delivered
this Notice of Borrowing as of the ___ day of _________________,____.


                                    WILMINGTON TRUST COMPANY, not in its
                                      individual capacity but solely as
                                      Subordination Agent, as agent and trustee
                                      for the Class B Trust, as Borrower

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



<PAGE>   41



               SCHEDULE I TO DOWNGRADE ADVANCE NOTICE OF BORROWING

                 [Insert Copy of computations in accordance with
                     Downgrade Advance Notice of Borrowing]



<PAGE>   42



         Annex IV to
         Revolving Credit Agreement


                        FINAL ADVANCE NOTICE OF BORROWING

                  The undersigned, a duly authorized signatory of the
undersigned borrower (the "Borrower"), hereby certifies to Morgan Stanley
Capital Services, Inc. (the "Liquidity Provider"), with reference to the
Revolving Credit Agreement (2000-lB) dated as of January 28, 2000, between the
Borrower and the Liquidity Provider (the "Liquidity Agreement"; the terms
defined therein and not otherwise defined herein being used herein as therein
defined or referenced), that:

                  (1) The Borrower is the Subordination Agent under the
         Intercreditor Agreement.

                  (2) The Borrower is delivering this Notice of Borrowing for
         the making of the Final Advance by the Liquidity Provider to be used
         for the funding of the Class B Cash Collateral Account in accordance
         with Section 3.6(i) of the Intercreditor Agreement by reason of the
         receipt by the Borrower of a Termination Notice from the Liquidity
         Provider with respect to the Liquidity Agreement, which Advance is
         requested to be made on

                  (3) The amount of the Final Advance requested hereby (i) is
         $__________.__, which equals the Maximum Commitment on the date hereof
         and is to be applied in respect of the funding of the Class B Cash
         Collateral Account in accordance with Section 3.6(i) of the
         Intercreditor Agreement, (ii) does not include any amount with respect
         to the payment of principal of, or premium on, the Class B
         Certificates, or principal of, or interest or premium on, the Class A
         Certificates or the Class C Certificates, (iii) was computed in
         accordance with the provisions of the Class B Certificates, the Class B
         Trust Agreement and the Intercreditor Agreement (a copy of which
         computation is attached hereto as Schedule I), and (iv) has not been
         and is not the subject of a prior or contemporaneous Notice of
         Borrowing.

                  (4) Upon receipt by or on behalf of the Borrower of the amount
         requested hereby, (a) the Borrower will deposit such amount in the
         Class B Cash Collateral Account and apply the same in accordance with
         the terms of Section 3.6(i) of the Intercreditor Agreement, (b) no
         portion of such amount shall be applied by the Borrower for any other
         purpose and (c) no portion of such amount until so applied shall be
         commingled with other funds held by the Borrower.

                  (5) The Borrower hereby requests that the Advance requested
         hereby be a Base Rate Advance [and that such Base Rate Advance be
         converted into a LIBOR Advance on the third Business Day following your
         receipt of this notice](1).


--------------------
(1)  Bracketed language may be included at Borrower's option


<PAGE>   43

                  The Borrower hereby acknowledges that, pursuant to the
Liquidity Agreement, (A) the making of the Final Advance as requested by this
Notice of Borrowing shall automatically and irrevocably terminate the obligation
of the Liquidity Provider to make further Advances under the Liquidity
Agreement; and (B) following the making by the Liquidity Provider of the Final
Advance requested by this Notice of Borrowing, the Borrower shall not be
entitled to request any further Advances under the Liquidity Agreement.

                  IN WITNESS WHEREOF, the Borrower has executed and delivered
this Notice of Borrowing as of the ___ day of ______________, ____.


                                    WILMINGTON TRUST COMPANY, not in its
                                      individual capacity but solely as
                                      Subordination Agent, as agent and trustee
                                      for the Class B Trust, as Borrower

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



<PAGE>   44



                 SCHEDULE I TO FINAL ADVANCE NOTICE OF BORROWING

                 [Insert Copy of Computations in accordance with
                       Final Advance Notice of Borrowing]



<PAGE>   45



         Annex V  to
         Revolving Credit Agreement


                              NOTICE OF TERMINATION

                                                          [Date]

Wilmington Trust Company,
   as Subordination Agent, as Borrower
One Rodney Square
1100 North Market Street
Wilmington, DE  19890-0001

Attention:  Corporate Trust Administration

                  Revolving Credit Agreement dated as of January 28, 2000,
between Wilmington Trust Company, as Subordination Agent, as agent and trustee
for the Atlas Air, Inc. Pass Through Trust, 2000-lB, as Borrower, and Morgan
Stanley Capital Services, Inc. (the "Liquidity Agreement")



Ladies and Gentlemen:

                  You are hereby notified that pursuant to Section 6.01 of the
Liquidity Agreement, by reason of the occurrence of a Liquidity Event of Default
and the existence of a Performing Note Deficiency (each as defined therein), we
are giving this notice to you in order to cause (i) our obligations to make
Advances (as defined therein) under such Liquidity Agreement to terminate on the
fifth Business Day after the date on which you receive this notice and (ii) you
to request a Final Advance under the Liquidity Agreement pursuant to Section
3.6(i) of the Intercreditor Agreement (as defined in the Liquidity Agreement) as
a consequence of your receipt of this notice.



<PAGE>   46



                  THIS NOTICE IS THE "NOTICE OF TERMINATION" PROVIDED FOR UNDER
THE LIQUIDITY AGREEMENT. OUR OBLIGATIONS TO MAKE ADVANCES UNDER THE LIQUIDITY
AGREEMENT WILL TERMINATE ON THE FIFTH BUSINESS DAY AFTER THE DATE ON WHICH YOU
RECEIVE THIS NOTICE.

                                        Very truly yours,

                                        Morgan Stanley Capital Services, Inc.,
                                              as Liquidity Provider


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






cc:      Wilmington Trust Company, as Class B Trustee



<PAGE>   47



         Annex VI  to
         Revolving Credit Agreement


                    NOTICE OF REPLACEMENT SUBORDINATION AGENT

[Date]

Attention:

                  Revolving Credit Agreement dated as of January 28, 2000,
between Wilmington Trust Company, as Subordination Agent, as agent and trustee
for the Atlas Air Pass Through Trust, 2000-lB, as Borrower, and Morgan Stanley
Capital Services, Inc. (the "Liquidity Agreement")



Ladies and Gentlemen:

                  For value received, the undersigned beneficiary hereby
irrevocably transfers to:


                                            ---------------------------------
                                            [Name of Transferee]



                                            ---------------------------------
                                            [Address of Transferee]

all rights and obligations of the undersigned as Borrower under the Liquidity
Agreement referred to above. The transferee has succeeded the undersigned as
Subordination Agent under the Intercreditor Agreement referred to in the first
paragraph of the Liquidity Agreement, pursuant to the terms of Section 8.1 of
the Intercreditor Agreement.

                  By this transfer, all rights of the undersigned as Borrower
under the Liquidity Agreement are transferred to the transferee and the
transferee shall hereafter have the sole rights and obligations as Borrower
thereunder. The undersigned shall pay any costs and expenses of such transfer,
including, but not limited to, transfer taxes or governmental charges.



<PAGE>   48



         We ask that this transfer be effective as of _______________, ____.



                                    WILMINGTON TRUST COMPANY, not in its
                                      individual capacity but solely as
                                      Subordination Agent, as agent and trustee
                                      for the Class B Trust, as Borrower

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


<PAGE>   49



         Exhibit I to
         Revolving Credit Agreement


                           FORM OF GUARANTEE AGREEMENT