Document:

<PAGE>

                                                                     Exhibit 4.2

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

                          REVOLVING CREDIT AGREEMENT

                           Dated as of July 31, 2000

                                    between

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

                            as Subordination Agent,
                         as agent and trustee for the
                  United Airlines 2000-1B Pass Through Trust,

                                  as Borrower

                                      and

                   LANDESBANK HESSEN-THURINGEN GIROZENTRALE,

                             as Liquidity Provider

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

                                  Relating to

                  United Airlines 2000-1B Pass Through Trust
      United Airlines Enhanced Pass Through Certificates, Series 2000-1B
<PAGE>

                               TABLE OF CONTENTS
                               -----------------

<TABLE>
<S>                                                                                                             <C>
                                                      ARTICLE I  DEFINITIONS

Section 1.01      Certain Defined Terms......................................................................   1

                                          ARTICLE II  AMOUNT AND TERMS OF THE COMMITMENT

Section 2.01      Advances...................................................................................   7
Section 2.02      Making the Advances........................................................................   7
Section 2.03      Fees.......................................................................................   9
Section 2.04      Automatic Reductions and Termination of the Maximum Commitment. ...........................   9
Section 2.05      Repayments of Interest Advances or the Final Advance.......................................  10
Section 2.06      Repayments of Downgrade Advances...........................................................  10
Section 2.07      Payments to the Liquidity Provider Under the Intercreditor Agreement.......................  11
Section 2.08      Book Entries...............................................................................  12
Section 2.09      Payments from Available Funds Only.........................................................  12
Section 2.10      Extension of Expiry Date. .................................................................  12

                                             ARTICLE III  OBLIGATIONS OF THE BORROWER

Section 3.01      Increased Costs............................................................................  13
Section 3.02      Capital Adequacy...........................................................................  14
Section 3.03      Payments Free of Deductions................................................................  14
Section 3.04      Payments...................................................................................  15
Section 3.05      Computations...............................................................................  16
Section 3.06      Payment on Non-Business Days...............................................................  16
Section 3.07      Interest...................................................................................  16
Section 3.08      Replacement of Borrower....................................................................  18
Section 3.09      Funding Loss Indemnification...............................................................  18
Section 3.10      Illegality.................................................................................  18
</TABLE>

                                       i
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<TABLE>
<S>                                                                                 <C>
                                       ARTICLE IV

                                  CONDITIONS PRECEDENT

Section 4.01   Conditions Precedent to Effectiveness ............................   21
Section 4.02   Conditions Precedent to Borrowing.................................   21

                                       ARTICLE V

                                       COVENANTS

Section 5.01   Affirmative Covenants of the Borrower.............................   21
Section 5.02   Negative Covenants of the Borrower................................   22

                                       ARTICLE VI

                              LIQUIDITY EVENTS OF DEFAULT

 Section 6.01   Liquidity Events of Default......................................   22

                                      ARTICLE VII

                                     MISCELLANEOUS

Section 7.01   Amendments, Etc...................................................   22
Section 7.02   Notices, Etc......................................................   22
Section 7.03   No Waiver; Remedies...............................................   23
Section 7.04   Further Assurances................................................   23
Section 7.05   Indemnification; Survival of Certain Provisions...................   23
Section 7.06   Liability of the Liquidity Provider...............................   24
Section 7.07   Costs, Expenses and Taxes.........................................   24
Section 7.08   Binding Effect; Participations....................................   25
Section 7.09   Severability......................................................   26
Section 7.10   GOVERNING LAW.....................................................   27
Section 7.11   Submission to Jurisdiction; Waiver of Jury Trial..................   27
Section 7.12   Execution in Counterparts.........................................   28
Section 7.13   Entirety..........................................................   28
Section 7.14   Headings..........................................................   28
Section 7.15   LIQUIDITY PROVIDER'S OBLIGATION TO MAKE ADVANCES..................   28
</TABLE>

                                      ii
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Annex I           Interest Advance Notice of Borrowing
Annex II          Non-Extension Advance Notice of Borrowing
Annex III         Downgrade Advance Notice of Borrowing
Annex IV          Final Advance Notice of Borrowing
Annex V           Notice of Termination
Annex VI          Notice of Replacement Subordination Agent

                                      iii
<PAGE>

                          REVOLVING CREDIT AGREEMENT

          This REVOLVING CREDIT AGREEMENT, dated as of July 31, 2000 (as it may
be amended, supplemented or otherwise modified from time to time in accordance
with the terms hereof, this "Agreement"), between STATE STREET BANK AND TRUST
                             ---------
COMPANY OF CONNECTICUT, NATIONAL ASSOCIATION, a national banking association,
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 LANDESBANK HESSEN-
                                       --------
THURINGEN GIROZENTRALE, a public-law banking institution organized under the
laws of Germany ("Liquidity Provider").
                  ------------------

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

          WHEREAS, pursuant to the Class B Trust Agreement (as defined below),
the Class B Trust is issuing the Class B Certificates; and

          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.

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

                                   ARTICLE I

                                  DEFINITIONS

          Section 1.01   Certain Defined Terms. (a) For all purposes of this
                         ---------------------
Agreement, except as otherwise expressly provided or unless the context
otherwise requires:

     (i)  the terms used herein that are defined in this Article I have the
                                                         ---------
meanings assigned to them in this Article I, and include the plural as well as
                                  ---------
the singular;

     (ii) all references in this Agreement to designated "Articles," "Sections"
and other subdivisions are to the designated Articles, Sections and other
subdivisions of this Agreement;

                                                        UAL EETC SERIES 2000-1 B
                                                      REVOLVING CREDIT AGREEMENT
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     (iii) the words "herein," "hereof" and "hereunder" and other words of
similar import refer to this Agreement as a whole and not to any particular
Article, Section or other subdivision; and

     (iv)  the term "including" means "including without limitation".

           "747 Leased Aircraft Participation Agreement" means, with respect to
            -------------------------------------------
the Equipment Note Indenture pertaining to the 747 Leased Aircraft, the
"Participation Agreement" referred to therein.

           "Additional Costs" has the meaning specified in Section 3.01.
            ----------------                               ------------

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

           "Applicable Liquidity Rate" has the meaning specified in Section
            -------------------------                               -------
3.07(g).
-------

           "Applicable Margin" means (w) with respect to any Unpaid Advance or
            -----------------
Applied Provider Advance, 1.5% and (x) with respect to any Unapplied Provider
Advance, 0.32% per annum.

           "Applied Downgrade Advance" has the meaning specified 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 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 (.25)%.

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

                                                        UAL EETC SERIES 2000-1 B
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          "Borrower" has the meaning specified in the recitals to this
           --------
Agreement.

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

          "Business Day" means any day (x) other than a Saturday or Sunday or a
           ------------
day on which commercial banks are authorized or required by law to close in
Chicago, Illinois, New York, New York or the city and state in which the Class B
Trustee, the Subordination Agent or any Indenture Trustee maintains its
corporate trust office or receives and disburses funds, and (y) if the
applicable Business Day relates to any Advance or amount bearing interest based
on LIBOR, on which dealings are carried on in the London interbank market.

          "Consent Period" has the meaning specified in Section 2.10.
           --------------                               ------------

          "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) any Taxes imposed on, based on, or measured
           --------------
by the overall net income, capital, franchises, or receipts (other than Taxes
which are or are in the nature of sales or use Taxes or value added Taxes) of
the Liquidity Provider or any of its Lending Offices, (ii) withholding Taxes
imposed under laws in effect on the date hereof by the United States on payments
to a recipient in the jurisdiction in which the Liquidity Provider's initial
Lending Office is located, and (iii) withholding Taxes imposed by the United
States on payments to a recipient in any other jurisdiction to which such
Lending Office is moved if, under the laws in effect at the time of such move,
such laws would require greater withholding of Taxes on payments to such
Liquidity Provider acting from an office in such jurisdiction than would be
required on payments to such Liquidity Provider acting from an office in the
jurisdiction from which such Lending Office was moved.

          "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
                                     --------
Taxes.

          "Expiry Date" means July 29, 2001, initially, or any date to which the
           -----------
Expiry Date is extended pursuant to Section 2.10.
                                    ------------

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

          "Indenture Trustee" means, with respect to any Equipment Note
           -----------------
Indenture, the Indenture Trustee thereunder.

          "Intercreditor Agreement" means the Intercreditor Agreement, dated as
           -----------------------
of July 31, 2000 between the Trustee, 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:

          (1)  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; and

          (2)  each subsequent period commencing on the last day of the
     preceding Interest Period and ending on the next Regular Distribution Date;

provided, however, that 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).

          "Leased Aircraft Participation Agreement" means, with respect to the
           ---------------------------------------
Equipment Note Indenture pertaining to each Leased Aircraft, the "Participation
Agreement" referred to therein.

          "Lending Office" means the lending office of the Liquidity Provider,
           --------------
presently located at Frankfurt am Main, Germany, or such other lending office as
the Liquidity Provider from time to time shall notify the Borrower as its
lending office hereunder.

          "LIBOR" means, with respect to any Interest Period, the interest rate
           -----
per annum (calculated on the basis of a 360-day year and actual days elapsed) at
which deposits in United States dollars are offered to prime banks in the London
interbank market as indicated on display page 3750 (British Bankers Association-
LIBOR) of the Dow Jones Markets Service (or such other page as may

                                                        UAL EETC SERIES 2000-1 B
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                                       4
<PAGE>

replace such display page 3750 for the purpose of displaying London interbank
offered rates for United States dollar deposits) or, if not so indicated, the
average (rounded upwards to the nearest 1/100%), as determined by the Liquidity
Provider, of such rates as indicated on the Reuters Screen LIBO Page (or such
other page as may replace such Reuters Screen LIBO Page for the purpose of
displaying London interbank offered rates for United States dollar deposits) or,
if neither such alternative is indicated, the average (rounded upwards to the
nearest 1/100%), as determined by the Liquidity Provider, of such rates offered
by the London Reference Banks to prime banks in the London interbank market, in
each case at or about 11:00 a.m. (London time) on the day two LIBOR Business
Days prior to the first day of such Interest Period for deposits of a duration
equal to such Interest Period (or such other period most nearly corresponding to
such period) in an amount substantially equal to the principal amount of the
applicable LIBOR Advance as of the first day of such Interest Period. The
Liquidity Provider will, if necessary, request that each of the London Reference
Banks provide a quotation of its rate. If at least two such quotations are
provided, the rate will be the average of the quotations (rounded upwards to the
nearest 1/100%). If no such quotation can be obtained, the rate will be Base
Rate.

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

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

          "Liquidity Indemnitee" means (i) the Liquidity Provider, (ii) each
           --------------------
Affiliate of the Liquidity Provider, (iii) the directors, officers, employees,
servants and agents of the Liquidity Provider and its Affiliates, and (iv) the
successors and permitted assigns of the persons described in clauses (i) through
(iii), inclusive.

          "Liquidity Provider" has the meaning specified in the recital of
           ------------------
parties to this Agreement.

          "London Reference Banks" means the principal London offices of
           ----------------------
National Westminster Bank PLC, the Mitsubishi Trust and Banking Corporation and
ABN AMRO Bank N.V., or such other bank or banks as may from time to time be
agreed to by United and the Liquidity Provider.

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

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<PAGE>

          "Maximum Commitment" means initially $24,127,219, as the same may be
           ------------------
reduced from time to time in accordance with Section 2.04(a).
                                             ---------------

          "Non-Excluded Tax" has the meaning specified in Section 3.03.
           ----------------                               ------------

          "Non-Extension Advance" means an Advance made 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.
   ------------

          "Owned Aircraft Participation Agreement" means, with respect to the
           --------------------------------------
Equipment Note Indenture pertaining to each Owned Aircraft, the "Participation
Agreement" referred to therein.

          "Participating Institution" has the meaning specified in Section
           -------------------------                               -------
7.08(b).
-------

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

          "Prospectus Supplement" means the Prospectus Supplement dated July 19,
           ---------------------
2000 relating to the Certificates, as such Prospectus Supplement may be amended
or supplemented.

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

          "Regulatory Change" has the meaning specified in Section 3.01.
           -----------------                               ------------

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

          "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 on the basis of a 360-day year comprised of twelve
30-day months, that would be payable on the Class B Certificates on each of the
three successive semiannual Regular Distribution Dates 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.

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                                       6
<PAGE>

          "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 Agreement) 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 and
United of a Termination Notice from the Liquidity Provider pursuant to Section
                                                                       -------
6.01; 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 V to this Agreement.
            -------

          "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 specified in Section 2.05.
           --------------                               ------------

          "Withdrawal Notice" has the meaning specified in Section 2.10.
           -----------------                               ------------

          (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:

          "747 Leased Aircraft," "Acceleration," "Additional Payments,"
           -------------------    ------------    -------------------
          "Affiliate," "Certificates," "Class A-1 Certificates," "Class A-2
           ---------    ------------    ----------------------    ---------
          Certificates," "Class B Cash Collateral Account," "Class B
          ------------    -------------------------------    -------
          Certificates," "Class B Trust," "Class B Trust Agreement," "Class B
          ------------    -------------    -----------------------    -------
          Trustee," "Class B Certificates," "Class C-1 Certificates," "Class C-2
          -------    --------------------    ----------------------    ---------
          Certificates," "Closing Date," "Controlling Party," "Distribution
          ------------    ------------    -----------------    ------------
          Date," "Downgraded Facility," "Equipment Note Indenture," "Equipment
          ----    -------------------    ------------------------    ---------
          Notes," "Fee Letter," "Final Maturity Date," "Indenture," "Investment
          -----    ----------    -------------------    ---------    ----------
          Earnings," "Leased Aircraft", "Liquidity Facility," "Liquidity
          --------    ---------------    ------------------    ---------
          Obligations," "Moody's," "Non-Extended
          -----------    -------    ------------

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<PAGE>

          Facility," "Note Purchase Agreements," "Operative Agreements," "Owned
          --------    ------------------------    --------------------    -----
          Aircraft", "Participation Agreements," "Performing Equipment Note,"
          --------    ------------------------    -------------------------
          "Person," "Pool Balance," "Rating Agency," "Regular Distribution
           ------    ------------    -------------    --------------------
          Date," "Replacement Liquidity Facility," "Responsible Officer,"
          ----    ------------------------------    -------------------
          "Scheduled Payment," "Special Payment," "Standard & Poor's," "Stated
           -----------------    ---------------    -----------------    ------
          Interest Rate," "Subordination Agent," "Taxes," "Threshold Rating,"
          -------------    -------------------    -----    ----------------
          "Triggering Event," "Trust Agreement," "Trustee," "Underwriter,"
           ----------------    ---------------    -------    -----------
          "Underwriting Agreement," "United," "United Bankruptcy Event" and
           ----------------------    ------    -----------------------
          "Written Notice."
           --------------

                                  ARTICLE II

                      AMOUNT AND TERMS OF THE COMMITMENT

               Section 2.01   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) in an aggregate amount at any time
                             ------------
outstanding not to exceed the Maximum Commitment.

               Section 2.02   Making the Advances. (a) Each "Interest Advance"
                              -------------------            ----------------
shall be made in a single Borrowing by delivery to the Liquidity Provider of a
written and completed Notice of Borrowing in substantially the form of Annex I,
                                                                       -------
signed by a Responsible Officer of the Borrower, such Interest Advance in an
amount not exceeding the Maximum Available Commitment at such time and shall be
used solely for the payment when due of 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 Available 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 Available Commitment shall be
reinstated by the amount of such repaid Interest Advance, but not to exceed the
Maximum Commitment; provided, however, that the Maximum Available 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 Equipment 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

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                                       8
<PAGE>

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 Available 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 upon a
               --------------------
downgrading of the Liquidity Provider's relevant debt rating issued by either
Rating Agency below the applicable Threshold Rating (as provided for in Section
3.6(c) of the Intercreditor Agreement) unless a Replacement Liquidity Facility
shall have been 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 Annex III, signed by a Responsible
                                          ---------
Officer of the Borrower, in an amount equal to the Maximum Available 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). Upon such downgrading,
the Liquidity Provider shall promptly deliver notice thereof to the Borrower,
the Trustee and United.

          (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, by delivery to the Liquidity Provider of a written and
            ------------
completed Notice of Borrowing in substantially the form of Annex IV, signed by a
                                                           --------
Responsible Officer of the Borrower, in an amount equal to the Maximum Available
Commitment at such time, and shall be used to fund the Class B Cash Collateral
Account (in accordance with Section 3.6(f) and Section 3.6(i) 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 11:00 a.m. (Chicago 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, before 4:00 p.m.
(Chicago time) on the date of such Borrowing or on such later Business Day
specified by the Borrower in such Notice of Borrowing, make available for the
account of its Lending Office, in U.S. dollars and in immediately available
funds, the amount of such Borrowing to be paid to the Borrower in accordance
with its payment instructions. If a Notice of Borrowing is delivered by the
Borrower in respect of any Borrowing after 11:00 a.m. (Chicago time) on a
Business Day, the Liquidity Provider shall, before 11:00 a.m. (Chicago time) on
the first Business Day 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, make available to the Borrower, in accordance with its payment
instructions, in U.S. dollars and in immediately available funds, the amount of
such 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

                                                        UAL EETC SERIES 2000-1 B
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                                       9
<PAGE>

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. Each Notice of Borrowing shall be effective upon
delivery of a copy thereof to the Liquidity Provider's New York Branch at the
address specified in Section 7.02.
                     ------------

          (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 11:00 a.m.
(Chicago 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), Section 2.02(c) or Section 2.02(d) 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 Class B Cash Collateral Account; provided,
                                                                --------
however, 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 and provided further, that the foregoing
                                       -------- -------

shall not affect or impair the rights of the Liquidity Provider to provide
written instructions with respect to the investment and reinvestment of the Cash
Collateral Accounts to the extent provided in Section 2.2(b) 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 Fee Letter.

          Section 2.04   Automatic Reductions and Termination of the Maximum
                         ---------------------------------------------------
Commitment.
----------

          (a)  Automatic Reductions. 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.

                                                        UAL EETC SERIES 2000-1 B
                                                      REVOLVING CREDIT AGREEMENT

                                      10
<PAGE>

          (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, 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; provided, however, 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 Available 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 an Applied Non- Extension Advance,
as the case may be, for all purposes of this Agreement (including, 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.

          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 (y) in the case of a Downgrade Advance, an "Applied Downgrade
                                                             -----------------
Advance" and (z) 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; and provided, further,
                                                            --------  -------
that if, following the making of a Provider Advance, the Liquidity Provider
delivers a Termination Notice to the Borrower pursuant to

                                                        UAL EETC SERIES 2000-1 B
                                                      REVOLVING CREDIT AGREEMENT

                                      11
<PAGE>

Section 6.01, 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 and the obligation for repayment
thereof. 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 the
amount of such reduction, plus interest on the principal amount prepaid as
provided in Section 3.07.
            ------------

          (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 amount of 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 principal amount
of all outstanding 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 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 the order of priority required by the
applicable provisions of Articles II and III of 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

                                                        UAL EETC SERIES 2000-1 B
                                                      REVOLVING CREDIT AGREEMENT

                                      12
<PAGE>

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 amounts
received by it that constitute Scheduled Payments or Special Payments or
payments under Sections 7(b) and 7(c) of the Leased Aircraft Participation
Agreement, Section 7(c) of the 747 Leased Aircraft Participation Agreement,
Section 5(b) of the Owned Aircraft Participation Agreement and Section 7 of the
747 Leased Equipment Note Purchase Agreement, Sections 5(i), 7 and 9 of the AFE
Note Purchase Agreement and Sections 4(i) and 7 of the United Equipment 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 shall 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 or the Intercreditor
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 Expiry Date. No earlier than the 60/th/
                         ------------------------
day and no later than the 40/th/ day prior to the then effective Expiry Date
(unless such Expiry Date is on or after the date that is 15 days after the Final
Maturity Date for the Class B Certificates), the Borrower shall request that the
Liquidity Provider extend the Expiry Date to the earlier of (i) the date that is
15 days after the Final Maturity Date for the Class B Certificates and (ii) the
date that is the day immediately preceding the 364/th/ day occurring after the
last day of the Consent Period (as hereinafter defined). Whether or not the
Borrower has made such request, the Liquidity Provider shall advise the
Borrower, no earlier than the 40/th/ day (or, if earlier, the date of the
Liquidity Provider's receipt of such request, if any, from the Borrower) and no
later than the 25/th/ day prior to the then effective Expiry Date (such period
the "Consent Period"), whether, in its sole discretion, it agrees to so extend
     --------------
the Expiry Date. If the Liquidity Provider advises the Borrower on or before the
date on which the Consent Period ends that such Expiry Date shall not be so
extended, or fails to irrevocably and unconditionally advise the Borrower on or
before the date on which the Consent Period ends that such Expiry Date shall be
so extended (and, in each case, 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 the date on which the Consent Period
ends (but prior to the then effective Expiry Date) to request a Non-Extension
Advance in accordance with Section 2.02(b) and Section 3.6(d) of the
                           ---------------     --------------
Intercreditor Agreement.

                                                        UAL EETC SERIES 2000-1 B
                                                      REVOLVING CREDIT AGREEMENT

                                      13
<PAGE>

                                  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 costs incurred by the Liquidity
Provider which are attributable to its making or maintaining any 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, or municipal, or any foreign laws or
regulations, or the adoption or making after such date of any interpretation,
regulation, directive, guideline, requirement or request whether or not having
the force of law, by any court or governmental or monetary authority charged
with the interpretation or administration thereof (a "Regulatory Change"),
                                                      -----------------
which: (1) changes the basis of taxation of any amounts payable to the Liquidity
Provider under this Agreement in respect of any such Advances or such obligation
(other than Excluded Taxes or any Non-Excluded Taxes; or (2) imposes or modifies
any reserve, special deposit, compulsory loan or similar requirements relating
to any extensions of credit or other assets of, or any deposits with other
liabilities of, the Liquidity Provider (including any such Advances or such
obligation or any deposits referred to in the definition of LIBOR or related
definitions). The Liquidity Provider agrees to use reasonable efforts
(consistent with its internal policy and 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 3.01 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 shall notify the Borrower of any event
occurring after the date of this Agreement that shall 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 3.01. 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 3.01.
                                                   ------------

          Notwithstanding the preceding two paragraphs, the Liquidity Provider
and the Subordination Agent agree that any permitted assignee or participant of
the initial Liquidity Provider

                                                        UAL EETC SERIES 2000-1 B
                                                      REVOLVING CREDIT AGREEMENT

                                      14
<PAGE>

that is not a bank shall not be entitled to the benefits of the preceding two
paragraphs (but without limiting the provisions of Section 7.08 hereof).
                                                   ------------

          Section 3.02   Capital Adequacy. If (1) compliance with any judicial,
                         ----------------
administrative or other governmental interpretation of any law or regulation or
(2) compliance by the Liquidity Provider or any corporation controlling the
Liquidity Provider with any guideline or request from any central bank or other
governmental authority (whether or not having the force of law) has the effect
of requiring an increase in the amount of capital required or expected 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 such additional amount 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 the need for, or reduce the amount of, any amount
payable under this Section 3.02 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 shall notify the Borrower of any event
occurring after the date of this Agreement that shall 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 3.02. 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
                                                                       -------
3.02.
----

          Notwithstanding the preceding two paragraphs, the Liquidity Provider
and the Subordination Agent agree that any permitted assignee or participant of
the initial Liquidity Provider that is not a bank shall not be entitled to the
benefits of the preceding two paragraphs (but without limiting the provisions of
Section 7.08 hereof).
------------

          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 Taxes, excluding Excluded Taxes (such non-
excluded taxes being referred to herein, collectively, as "Non-Excluded Taxes").
                                                           ------------------
If any Non-Excluded Taxes are required to be withheld or deducted from any
amounts payable to the Liquidity Provider under this Agreement, the Borrower
shall (i) within the time prescribed therefor by applicable law pay to the
appropriate governmental or taxing authority the full amount of any such Non-
Excluded Taxes (and any additional Non-Excluded Taxes in respect of the payment
required under clause (ii) below) 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

                                                        UAL EETC SERIES 2000-1 B
                                                      REVOLVING CREDIT AGREEMENT

                                      15
<PAGE>

Liquidity Provider an additional amount which (after deduction of all such Non-
Excluded Taxes) shall be sufficient to yield to the Liquidity Provider 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 Borrower
shall furnish to the Liquidity Provider the original or a certified copy of (or
other documentary evidence of) the payment of the Non-Excluded Taxes applicable
to such payment. 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 such additional amounts that may thereafter
accrue and would not, in the reasonable judgment of the Liquidity Provider, be
otherwise materially disadvantageous to the Liquidity Provider or require the
Liquidity Provider to incur any cost or expenses for which it is not indemnified
by the Borrower. The Liquidity Provider shall deliver to the Borrower such
certificates and documents as may be reasonably requested by the Borrower and
required by applicable law to establish that payments hereunder are exempt from
(or entitled to a reduced rate of) withholding Tax.

          (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
additional amounts payable 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) shall 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 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.

          (c)  If any exemption from, or reduction in the rate of, any Taxes is
reasonably available to the Borrower to establish that payments under this
Agreement are exempt from (or entitled to a reduced rate of) tax, the Borrower
shall deliver to the Liquidity Provider such form or forms and such other
evidence of the eligibility of the Borrower for such exemption or reduction as
the Liquidity Provider may reasonably identify to the Borrower as being required
as a condition to exemption from, or reduction in the rate of, any Taxes.

          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. (Chicago
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

                                                        UAL EETC SERIES 2000-1 B
                                                      REVOLVING CREDIT AGREEMENT

                                      16
<PAGE>

immediately available funds, by wire transfer to Citibank, N.A., New York, ABA
No. 021000089, for credit to Helaba, account no. 10920118, ref: United Airlines
2000-1B account 4111316.

          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 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 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 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 shall 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 applicable 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 shall 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. Nothing contained in this Section 3.07 shall require the Borrower to
                                     ------------
pay any amount under this Section 3.07 other than to the extent the Borrower
                          ------------
shall have funds available therefor.

                                       17
<PAGE>

               (b)  Except as provided in Section 3.07(e),  each Advance shall
                                          ---------------
be either a Base Rate Advance or a LIBOR  Advance as provided in this Section or
                                                                      -------
Section 3.10. Each such Advance shall 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, however, 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 A.M. (New York
                      ------------
time) on the first Business Day following the Borrower's receipt of the
applicable Termination Notice, 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 LIBOR 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 outstanding Unapplied Non-Extension Advance shall bear
interest in an amount equal to the Investment Earnings on amounts on deposit in
the Class B Cash Collateral Account plus the Applicable Margin for such period,
payable in arrears on each Regular Distribution Date.

               (f)  Each amount not paid 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 1.00% per annum.

               (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."
----

                                       18
<PAGE>

          Section 3.08   Replacement of Borrower. Subject to Section 5.02,
                         -----------------------             ------------
from time to time and subject to the successor Borrower's meeting the
eligibility requirements set forth in Section 6.9 of the 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 VI (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, any conversion of a LIBOR
     Advance to a Base Rate Advance or a conversion of a LIBOR Advance to an
     Advance bearing interest in accordance with Section 3.07(e), in any case 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

                                       19
<PAGE>

                             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, each dated such date, and in the case
     of each document delivered pursuant to paragraphs (i), (ii) and (iii), in
                                            --------------  ----     -----
     form and substance satisfactory to the Liquidity Provider:

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

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

     (3)  Fully executed copies of each of the Operative Agreements (other than
this Agreement and the Intercreditor Agreement);

     (4)  A copy of the Prospectus Supplement and specimen copies of the Class B
Certificates;

     (5)  An executed copy of each opinion, document, instrument and certificate
delivered pursuant to the Class B Trust Agreement, the Intercreditor Agreement,
the Note Purchase Agreements and the other Operative Agreements (together with,
in the case of each such opinion, other than the opinion of counsel for the
Underwriters, 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);

     (6)  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 Trustee and the Liquidity Provider
created by the Operative Agreements;

     (7)  An agreement from United, pursuant to which United agrees to provide
copies of its Quarterly Reports on Form 10-Q and Annual Reports on Form 10-K to
the Liquidity Provider promptly after becoming publicly available; and

     (8)  Such other documents, instruments, opinions and approvals as the
Liquidity Provider shall have reasonably requested.

                                       20
<PAGE>

          (b)  The following statements shall be true on and as of the Effective
Date:

    (i)   The representations and warranties in the Note Purchase Agreements and
each of the Participation Agreements are true and correct on and as of the
Effective Date as though made on and as of the Effective Date;

    (ii)  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; and

    (iii) There has been no material adverse change in the financial condition
or results of operations of United and its subsidiaries taken as a whole since
December 31, 1999.

          (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 Underwriter under the Underwriting
     Agreement shall have been satisfied (unless any of such conditions
     precedent shall have been waived by the Underwriter).

          (e)  The Borrower shall have received 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.

                                   ARTICLE V

                                   COVENANTS

                                       21
<PAGE>

          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 shall, unless the Liquidity
Provider shall otherwise consent in writing:

          (a)  Performance of 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 any Operative Agreement entered into after the date
hereof.

          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 shall not appoint or permit or
suffer to be appointed any successor Borrower without the 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
Equipment 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) the obligation of the Liquidity Provider to make Advances hereunder to
expire on the fifth Business Day after the date on which such Termination Notice
is received by the Borrower and United, (ii) the Borrower to promptly request,
and the Liquidity Provider to promptly make, a Final Advance in accordance with
Section 2.02(d) and Section 3.6(i) of the Intercreditor Agreement, (iii) all
---------------
other outstanding Advances to be automatically converted into Final Advances for
purposes of

                                       22
<PAGE>

determining the Applicable Liquidity Rate for interest payable thereon, and (iv)
subject to Sections 2.07 and 2.09, 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, 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 sent by telecopier):

          Borrower:        State Street Bank and Trust Company of Connecticut,
                           National Association
                           225 Asylum Street
                           Goodwin Square
                           Hartford, Connecticut 06103
                           Attention: Corporate Trust Division

                           Telephone: 860-244-1844
                           Telecopy: 860-244-1881

                                       23
<PAGE>

          Liquidity
          Provider:        Landesbank Hessen-Thuringen Girozentrale
                           Main Tower
                           Neue Mainzer Str. 52 - 58
                           60311 Frankfurt am Main
                           Germany
                           Attention: Asset Finance

                           Telephone: 49699132-4882
                           Telecopy: 49699132-4392

with a copy of any Notice of Borrowing to:

                           Landesbank Hessen-Thuringen
                           420 Fifth Avenue, 24/th/ Floor
                           New York, NY 10018
                           Attention: Project Finance, Michael Novack
                           Telephone:   212-703-5224
                           Telecopy:    212-703-5256

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 with receipt confirmed, (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 shall not be effective until received by the Liquidity Provider,
--     ---
subject to the last sentence of Section 2.02(e). 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.

          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

                                       24
<PAGE>

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 7 of the AFE Note Purchase Agreement, Sections 7(b)
and 7(c) of the Leased Aircraft Participation Agreement, Section 7(c) of the 747
Leased Aircraft Participation Agreement and Section 5(b) of the Owned Aircraft
Participation 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 (including the expenses set forth in
Section 7 of the 747 Leased Equipment Note Purchase Agreement, Section 9 of the
AFE Note Purchase Agreement and Section 7 of the United Equipment Note Purchase
Agreement) of any kind or nature whatsoever (other than any Expenses of the
nature described in Section 3.01, 3.02 or 7.07 hereof or in the Fee Letter
                    ------------  ----    ----
(regardless of whether indemnified against pursuant to said Sections or in such
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 Intercreditor
Agreement, the Fee Letter or any Participation 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 to the extent such Expense is (i) 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 Fee Letter or any other Operative Agreement to which it is a
party. The indemnities and cost provisions contained in Section 7 of the AFE
Note Purchase Agreement, Section 5(i) of the 747 Leased Equipment Note Purchase
Agreement, Section 4(i) of the United Equipment Note Purchase Agreement,
Sections 7(b) and 7(c) of the Leased Aircraft Participation Agreement, Section
7(c) of the 747 Leased Aircraft Participation Agreement, and Section 5(b) of the
Owned Aircraft Participation Agreement and the provisions of Sections 3.01,
                                                             -------------
3.02, 3.03, 3.09 7.05 and 7.07 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, directors, employees 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;

                                       25
<PAGE>

provided, however, that the Borrower shall have a claim against 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 complying with
the terms and conditions hereof.

          (b)  Neither the Liquidity Provider nor any of its officers,
employees, directors 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
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 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, including, without limitation, the reasonable
fees and expenses of outside counsel for the Liquidity Provider and (B) on
demand, all reasonable costs and expenses of the Liquidity Provider (including
reasonable counsel fees and expenses) 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
Document 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

                                       26
<PAGE>

this Section 7.08) nor the Borrower (except as contemplated by Section 3.08)
     ------------                                              ------------
shall have the right to assign its rights or obligations 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 and under the other
Operative Agreements to such Persons (other than United or any of its
Affiliates) as 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, shall 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 and the like as they pertain to
the Liquidity Provider shall be deemed also to include those of each of its
participants that are banks (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 other than a result of a change in law following the date of any
participation).

     (b)  If, pursuant to Section 7.08(a) above, the Liquidity Provider sells
                          ---------------
any participation in this Agreement to any bank or other entity (each, a
"Participating Institution"), then, concurrently with the effectiveness of such
 -------------------------
participation, the Participating Institution 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 shall be
required to be withheld by the Borrower or the Liquidity Provider with respect
to any payments to be made to such Participating Institution 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-8ECI or Form W-8BEN, as
appropriate, or other applicable form, certificate or document prescribed by the
Internal Revenue Service certifying, in each case, such Participating
Institution'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-8ECI or Form W-
8BEN, 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- 8BEN or Form W-8ECI that such Participating Institution 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) from

                                       27
<PAGE>

the Participating Institution indicating that payments hereunder are not subject
to United States federal withholding tax, the Borrower shall withhold taxes as
required by law from such payments at the applicable statutory rate without any
obligation to make additional payments under Section 3.03.
                                             ------------

          (c)  Notwithstanding the other provisions of this Section 7.08, the
                                                            ------------
Liquidity Provider may assign and pledge all or any portion of the Advances
owing to it to any Federal Reserve Bank or the United States Treasury as
collateral security pursuant to Regulation A of the Board of Governors of the
Federal Reserve System and any Operating Circular issued by such Federal Reserve
Bank, provided that any payment in respect of such assigned Advances made by the
Borrower to the Liquidity Provider in accordance with the terms of this
Agreement shall satisfy the Borrower's obligations hereunder in respect of such
assigned Advance to the extent of such payment. No such assignment shall release
the Liquidity Provider from its obligations hereunder.

          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 the extent of such prohibition,
unenforceability or non-authorization 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 LAWS OF THE STATE OF NEW YORK (WITHOUT REGARD
TO THE PRINCIPLES OF CONFLICTS OF LAWS THEREOF (OTHER THAN SECTION 5-1401 OF THE
NEW YORK GENERAL OBLIGATIONS LAW)) AND THE OBLIGATIONS, RIGHTS AND REMEDIES OF
THE PARTIES UNDER THIS AGREEMENT SHALL BE DETERMINED IN ACCORDANCE WITH SUCH
LAWS.

          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 non-exclusive 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;

                                       28
<PAGE>

          (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 of mail), postage prepaid, to each party
     hereto at its address set forth in Section 7.02, 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.

          (c)    The Liquidity Provider hereby waives any immunity it may have
from the jurisdiction of the courts of the United States or of any State and
waives any immunity any of its properties located in the United States may have
from attachment or execution upon a judgment entered by any such court under the
United States Foreign Sovereign Immunities Act of 1976 or any similar successor
legislation.

          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 counterpart, 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 and the other Operative
                         --------
Agreements 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.

                                       29
<PAGE>

          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.

                                       30
<PAGE>

     IN WITNESS WHEREOF, the parties hereto 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.

                                      STATE STREET BANK AND TRUST
                                      COMPANY OF CONNECTICUT,
                                      NATIONAL ASSOCIATION,
                                      not in its individual capacity but solely
                                      as Agent and Trustee, as Borrower

                                      By:_______________________________________
                                         Name:
                                         Title:

                                      S-1

<PAGE>

                                      LANDESBANK HESSEN-THURINGEN
                                      GIROZENTRALE,
                                      as Liquidity Provider

                                      By:_______________________________________
                                         Name:
                                         Title:

                                      S-2
<PAGE>

                                                                      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 Landesbank Hessen-Thuringen Girozentrale
      --------
(the "Liquidity Provider"), with reference to the Revolving Credit Agreement,
      ------------------
dated as of July 31, 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 for the
     payment of interest on the Class B Certificates which was payable on
     ________________ 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 ____________. The Interest Advance should be transferred to
     account __________.

          (3)  The amount of the Interest Advance requested hereby (i) is
     $_______, to be applied in respect of the payment of interest which was due
     and payable on the Class B Certificates on such Distribution Date, (ii)
     does not include any amount with respect to the payment of principal of, or
     Additional Payments on, the Class A-1 Certificates, the Class A-2
     Certificates, the Class B Certificates, the Class C-1 Certificates or the
     Class C-2 Certificates, or interest on the Class A-1 Certificates, the
     Class A-2 Certificates, the Class C-1 Certificates or the Class C-2
     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 Available Commitment on the date hereof,
     and (v) 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 shall 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.

                                      I-1
<PAGE>

     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 Maximum Available 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 Notice of Borrowing 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 __________, ___.

                                       STATE STREET BANK AND TRUST
                                       COMPANY OF CONNECTICUT,
                                       NATIONAL ASSOCIATION,
                                       not in its individual capacity but solely
                                       as Subordination Agent, as Borrower

                                       By:________________________________
                                          Name:
                                          Title:

                                      I-2
<PAGE>

              SCHEDULE I TO INTEREST ADVANCE NOTICE OF BORROWING

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

                                      I-3
<PAGE>

                                                                     Annex II to
                                                      Revolving Credit Agreement

                   NON-EXTENSION ADVANCE NOTICE OF BORROWING

          The undersigned, a duly authorized signatory of the undersigned
borrower (the "Borrower"), hereby certifies to Landesbank Hessen-Thuringen
               --------
Girozentrale (the "Liquidity Provider"), with reference to the Revolving Credit
                   ------------------
Agreement, dated as of July 31, 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 __________, ____. The Non-Extension Advance should be
     transferred to ____________.

          (3)  The amount of the Non-Extension Advance requested hereby (i) is
     $_________.__, which equals the Maximum Available 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 Additional Payments on, the Class A-1 Certificates,
     the Class A-2 Certificates, the Class B Certificates, the Class C-1
     Certificates or the Class C-2 Certificates, or interest on the Class A-1
     Certificates, the Class A-2 Certificates, the Class C-1 Certificates or the
     Class C-2 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

                                     II-1
<PAGE>

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 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 _________, ____.

                                       STATE STREET BANK AND TRUST COMPANY
                                       OF CONNECTICUT,
                                       NATIONAL ASSOCIATION,
                                       not in its individual capacity but solely
                                       as Subordination Agent,as Borrower

                                       By:______________________________
                                          Name:
                                          Title:

                                     II-2
<PAGE>

                      SCHEDULE I TO NON-EXTENSION ADVANCE
                              NOTICE OF BORROWING
                [Insert copy of computations in accordance with
                  Non-Extension Advance Notice of Borrowing]

                                     II-3
<PAGE>

                                                                    Annex III to
                                                      Revolving Credit Agreement

                     DOWNGRADE ADVANCE NOTICE OF BORROWING

     The undersigned, a duly authorized signatory of the undersigned borrower
(the "Borrower"), hereby certifies to Landesbank Hessen-Thuringen Girozentrale
      --------
(the "Liquidity Provider"), with reference to the Revolving Credit Agreement
      ------------------
dated as of July 31, 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 the downgrading
     of the relevant rating of the Liquidity Provider issued by either Rating
     Agency below the Threshold Rating, which Advance is requested to be made on
     ____________. The Downgrade Advance should be transferred to __________.

          (3)  The amount of the Downgrade Advance requested hereby (i) is
     $________, which equals the Maximum Available 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
     principal of, or Additional Payments on, the Class A-1 Certificates, the
     Class A-2 Certificates, the Class B Certificates, the Class C-1
     Certificates or the Class C-2 Certificates or interest on the Class A-1
     Certificates, the Class A-2 Certificates, the Class C-1 Certificates or the
     Class C-2 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 1), 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 shall 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.

                                     III-1
<PAGE>

          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 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 _________, ____.

                                       STATE STREET BANK AND TRUST COMPANY
                                       CONNECTICUT,
                                       NATIONAL ASSOCIATION,
                                       not in its individual capacity but solely
                                       as Subordination Agent, as Borrower

                                       By:_____________________________
                                          Name:
                                          Title:

                                     III-2
<PAGE>

              SCHEDULE I TO DOWNGRADE ADVANCE NOTICE OF BORROWING

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

                                     III-3
<PAGE>

                                                                     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 Landesbank Hessen-Thuringen
               --------
Girozentrale (the "Liquidity Provider"), with reference to the Revolving Credit
                   ------------------
Agreement, dated as of July 31, 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 A-1 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 Available 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 Additional Payments on the Class A-1 Certificates, the
     Class A-2 Certificates, the Class B Certificates, the Class C-1
     Certificates or the Class C-2 Certificates, or interest on the Class A-1
     Certificates, the Class A-2 Certificates, the Class C-1 Certificates or the
     Class C-2 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 shall 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.
<PAGE>

          (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/

          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 __________, ____.

                                       STATE STREET BANK AND TRUST
                                       COMPANY OF CONNECTICUT,
                                       NATIONAL ASSOCIATION,
                                       not in its individual capacity but solely
                                       as Subordination Agent, as Borrower

                                       By:_____________________________
                                          Name:
                                          Title:

__________
/1/  Bracketed language may be included at Borrower's option.
 -
<PAGE>

                SCHEDULE I TO FINAL ADVANCE NOTICE OF BORROWING

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

                                                                      Annex V to
                                                      Revolving Credit Agreement

                             NOTICE OF TERMINATION

                                    [Date]

State Street Bank and Trust Company
of Connecticut, National Association,
 as Subordination Agent, as Borrower
225 Asylum Street
Goodwin Square
Hartford, Connecticut 06103

Attention: Corporate Trust Administration

Re:  Revolving Credit Agreement, dated as of July 31, 2000, between State Street
     Bank and Trust Company of Connecticut, National Association, as
     Subordination Agent, as agent and trustee for the United Airlines 2000-1B
     Pass Through Trust, as Borrower, and Landesbank Hessen-Thuringen
     Girozentrale (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 a
Performing Equipment 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.

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

                                        Very truly yours,

                                        LANDESBANK HESSEN-THURINGEN
                                        GIROZENTRALE,
                                        as Liquidity Provider

                                        By:________________________________
                                           Name:
                                           Title:

cc:  State Street Bank and Trust Company
     of Connecticut, National Association, as Trustee
<PAGE>

                                                                     Annex VI to
                                                      Revolving Credit Agreement

                   NOTICE OF REPLACEMENT SUBORDINATION AGENT

                                    [Date]

Attention:

Re:  Revolving Credit Agreement, dated as of July 31, 2000, between State Street
Bank and Trust Company of Connecticut, National Association, as Subordination
Agent, as agent and trustee for the United Airlines 2000-1B Pass Through Trust,
as Borrower, and Landesbank Hessen-Thuringen Girozentrale (the "Liquidity
                                                                ---------
Agreement")
---------

Ladies and Gentlemen:

For value received, the undersigned hereby irrevocably transfers to:

                                                  ________________________
                                                    [Name of Transferee]

                                                  ________________________
                                                  [Address of Transferee]

all rights and obligations of the undersigned as Borrower and Subordination
Agent under the Liquidity Agreement referred to above. The transferee has
succeeded the undersigned as Borrower and 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 and
Subordination Agent under the Liquidity Agreement are transferred to the
transferee and the transferee shall hereafter have the sole rights and
obligations as Borrower and Subordination Agent thereunder. The undersigned
shall pay any costs and expenses of such transfer, including, but not limited
to, transfer taxes or governmental charges.
<PAGE>

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

                                       STATE STREET BANK AND TRUST COMPANY OF
                                       CONNECTICUT, NATIONAL ASSOCIATION
                                       not in its individual capacity but solely
                                       as Subordination Agent, as Borrower

                                       By:___________________________________
                                          Name:
                                          Title:<PAGE>

                                                                     EXHIBIT 4.3
--------------------------------------------------------------------------------

                          REVOLVING CREDIT AGREEMENT

                           Dated as of July 31, 2000

                                    between

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

                            as Subordination Agent,
                         as agent and trustee for the
                 United Airlines 2000-1A-2 Pass Through Trust,

                                  as Borrower

                                      and

                   LANDESBANK HESSEN-THURINGEN GIROZENTRALE,

                             as Liquidity Provider

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

                                  Relating to

                 United Airlines 2000-1A-2 Pass Through Trust
     United Airlines Enhanced Pass Through Certificates, Series 2000-1A-2
<PAGE>

                               TABLE OF CONTENTS
                               -----------------

<TABLE>
<S>                                                                                                             <C>
                                                             ARTICLE I

                                                            DEFINITIONS

Section 1.01    Certain Defined Terms.....................................................................        1

                                                            ARTICLE II

                                                AMOUNT AND TERMS OF THE COMMITMENT

Section 2.01    Advances..................................................................................        7
Section 2.02    Making the Advances.......................................................................        7
Section 2.03    Fees......................................................................................        9
Section 2.04    Automatic Reductions and Termination of the Maximum Commitment. ..........................        9
Section 2.05    Repayments of Interest Advances or the Final Advance......................................       10
Section 2.06    Repayments of Downgrade Advances..........................................................       10
Section 2.07    Payments to the Liquidity Provider Under the Intercreditor Agreement......................       11
Section 2.08    Book Entries..............................................................................       12
Section 2.09    Payments from Available Funds Only........................................................       12
Section 2.10    Extension of Expiry Date. ................................................................       12

                                                            ARTICLE III

                                                    OBLIGATIONS OF THE BORROWER

Section 3.01    Increased Costs...........................................................................       13
Section 3.02    Capital Adequacy..........................................................................       14
Section 3.03    Payments Free of Deductions...............................................................       14
Section 3.04    Payments..................................................................................       15
Section 3.05    Computations..............................................................................       16
Section 3.06    Payment on Non-Business Days..............................................................       16
Section 3.07    Interest..................................................................................       16
Section 3.08    Replacement of Borrower...................................................................       18
Section 3.09    Funding Loss Indemnification..............................................................       18
Section 3.10    Illegality................................................................................       18
</TABLE>

                                                      UAL EETC SERIES 2000-1A-2
                                                     REVOLVING CREDIT AGREEMENT

                                              i
<PAGE>

<TABLE>
<S>                                                                                                              <C>
                                                    ARTICLE IV

                                               CONDITIONS PRECEDENT

Section 4.01    Conditions Precedent to Effectiveness ....................................................       21
Section 4.02    Conditions Precedent to Borrowing.........................................................       21

                                                     ARTICLE V

                                                     COVENANTS

Section 5.01    Affirmative Covenants of the Borrower.....................................................       21
Section 5.02    Negative Covenants of the Borrower........................................................       22

                                                    ARTICLE VI

                                            LIQUIDITY EVENTS OF DEFAULT

Section 6.01    Liquidity Events of Default...............................................................       22

                                                    ARTICLE VII

                                                   MISCELLANEOUS

Section 7.01    Amendments, Etc...........................................................................       22
Section 7.02    Notices, Etc..............................................................................       22
Section 7.03    No Waiver; Remedies.......................................................................       23
Section 7.04    Further Assurances........................................................................       23
Section 7.05    Indemnification; Survival of Certain Provisions...........................................       23
Section 7.06    Liability of the Liquidity Provider.......................................................       24
Section 7.07    Costs, Expenses and Taxes.................................................................       24
Section 7.08    Binding Effect; Participations............................................................       25
Section 7.09    Severability..............................................................................       26
Section 7.10    GOVERNING LAW.............................................................................       27
Section 7.11    Submission to Jurisdiction; Waiver of Jury Trial..........................................       27
Section 7.12    Execution in Counterparts.................................................................       28
Section 7.13    Entirety..................................................................................       28
Section 7.14    Headings..................................................................................       28
Section 7.15    LIQUIDITY PROVIDER'S OBLIGATION TO MAKE ADVANCES..........................................       28
</TABLE>

                                                      UAL EETC SERIES 2000-1A-2
                                                     REVOLVING CREDIT AGREEMENT

                                              ii
<PAGE>

Annex I      Interest Advance Notice of Borrowing
Annex II     Non-Extension Advance Notice of Borrowing
Annex III    Downgrade Advance Notice of Borrowing
Annex IV     Final Advance Notice of Borrowing
Annex V      Notice of Termination
Annex VI     Notice of Replacement Subordination Agent

                                                   UAL EETC SERIES 2000-1A-2
                                                  REVOLVING CREDIT AGREEMENT

                                               iii
<PAGE>

                          REVOLVING CREDIT AGREEMENT

             This REVOLVING CREDIT AGREEMENT, dated as of July 31, 2000 (as it
may be amended, supplemented or otherwise modified from time to time in
accordance with the terms hereof, this "Agreement"), between STATE STREET BANK
                                        ---------
AND TRUST  COMPANY OF  CONNECTICUT,  NATIONAL  ASSOCIATION,  a national  banking
association,  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 A-2 Trust (as defined  below)  (the  "Borrower"),  and  LANDESBANK
                                                    --------
HESSEN-THURINGEN  GIROZENTRALE, a public-law banking institution organized under
the laws of Germany ("Liquidity Provider").
                      ------------------

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

             WHEREAS, pursuant to the Class A-2 Trust Agreement (as defined
below), the Class A-2 Trust is issuing the Class A-2 Certificates; and

             WHEREAS, the Borrower,  in order to support the timely payment of a
portion of the interest on the Class A-2 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.

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

                                   ARTICLE I

                                  DEFINITIONS

             Section 1.01     Certain Defined Terms. (a) For all purposes of
                              ---------------------
this Agreement, except as otherwise expressly provided or unless the context
otherwise requires:

         (1) the terms used herein that are defined in this Article I have the
                                                            ---------
meanings assigned to them in this Article I, and include the plural as well as
                                  ---------
the singular;

         (2) all references in this Agreement to designated "Articles,"
"Sections" and other subdivisions are to the designated Articles, Sections and
other subdivisions of this Agreement;
<PAGE>

         (3) the words  "herein,"  "hereof" and "hereunder" and other words of
similar  import  refer to this  Agreement  as a whole and not to any  particular
Article, Section or other subdivision; and

         (4) the term "including" means "including without limitation".

             "747 Leased Aircraft Participation Agreement" means, with respect
              -------------------------------------------
to the Equipment Note Indenture pertaining to the 747 Leased Aircraft, the
"Participation Agreement" referred to therein.

             "Additional Costs" has the meaning specified in Section 3.01.
              ----------------                               ------------

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

             "Applicable Liquidity Rate" has the meaning specified in Section
              -------------------------                               -------
3.07(g).
-------

             "Applicable Margin" means (w) with respect to any Unpaid Advance or
              -----------------
Applied Provider Advance, 1.5% and (x) with respect to any Unapplied Provider
Advance, 0.30% per annum.

             "Applied Downgrade Advance" has the meaning specified 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 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 (.25)%.

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

                                       2
<PAGE>

             "Borrower" has the meaning specified in the recitals to this
              --------
Agreement.

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

             "Business Day" means any day (x) other than a Saturday or Sunday or
              ------------
a day on which commercial banks are authorized or required by law to close in
Chicago, Illinois, New York, New York or the city and state in which the
Class A-2 Trustee, the Subordination Agent or any Indenture Trustee maintains
its corporate trust office or receives and disburses funds, and (y) if the
applicable Business Day relates to any Advance or amount bearing interest based
on LIBOR, on which dealings are carried on in the London interbank market.

             "Consent Period" has the meaning specified in Section 2.10.
              --------------                               ------------

             "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) any Taxes imposed on, based on, or
              --------------
measured by the overall net income, capital, franchises, or receipts (other than
Taxes which are or are in the nature of sales or use Taxes or value added Taxes)
of the Liquidity Provider or any of its Lending Offices, (ii) withholding Taxes
imposed under laws in effect on the date hereof by the United States on payments
to a recipient in the jurisdiction in which the Liquidity Provider's initial
Lending Office is located, and (iii) withholding Taxes imposed by the United
States on payments to a recipient in any other jurisdiction to which such
Lending Office is moved if, under the laws in effect at the time of such move,
such laws would require greater withholding of Taxes on payments to such
Liquidity Provider acting from an office in such jurisdiction than would be
required on payments to such Liquidity Provider acting from an office in the
jurisdiction from which such Lending Office was moved.

             "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
                                     --------
Taxes.

             "Expiry Date" means July 29, 2001, initially, or any date to which
              -----------
the Expiry Date is extended pursuant to Section 2.10.
                                        ------------

                                       3
<PAGE>

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

             "Indenture Trustee" means, with respect to any Equipment Note
              -----------------
Indenture, the Indenture Trustee thereunder.

             "Intercreditor Agreement" means the Intercreditor Agreement, dated
              -----------------------
as of July 31, 2000 between the Trustee, 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:

             (1) 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 A-2
         Cash Collateral Account for the purpose of paying interest on the Class
         A-2 Certificates as contemplated by Section 2.06(a) hereof and, in
                                             ---------------
         either case, ending on the next Regular Distribution Date; and

             (2) each subsequent period commencing on the last day of the
         preceding Interest Period and ending on the next Regular Distribution
         Date;

provided, however, that 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).

             "Leased Aircraft Participation Agreement" means, with respect to
              ---------------------------------------
the Equipment Note Indenture pertaining to each Leased Aircraft, the
"Participation Agreement" referred to therein.

             "Lending Office" means the lending office of the Liquidity
              --------------
Provider, presently located at Frankfurt am Main, Germany, or such other lending
office as the Liquidity Provider from time to time shall notify the Borrower as
its lending office hereunder.

             "LIBOR" means, with respect to any Interest Period, the interest
              -----
rate per annum (calculated on the basis of a 360-day year and actual days
elapsed) at which deposits in United States dollars are offered to prime banks
in the London interbank market as indicated on display page 3750 (British
Bankers Association-LIBOR) of the Dow Jones Markets Service (or such other page
as may

                                       4
<PAGE>

replace such display page 3750 for the purpose of displaying London interbank
offered rates for United States dollar deposits) or, if not so indicated, the
average (rounded upwards to the nearest 1/100%), as determined by the Liquidity
Provider, of such rates as indicated on the Reuters Screen LIBO Page (or such
other page as may replace such Reuters Screen LIBO Page for the purpose of
displaying London interbank offered rates for United States dollar deposits) or,
if neither such alternative is indicated, the average (rounded upwards to the
nearest 1/100%), as determined by the Liquidity Provider, of such rates offered
by the London Reference Banks to prime banks in the London interbank market, in
each case at or about 11:00 a.m. (London time) on the day two LIBOR Business
Days prior to the first day of such Interest Period for deposits of a duration
equal to such Interest Period (or such other period most nearly corresponding to
such period) in an amount substantially equal to the principal amount of the
applicable LIBOR Advance as of the first day of such Interest Period. The
Liquidity Provider will, if necessary, request that each of the London Reference
Banks provide a quotation of its rate. If at least two such quotations are
provided, the rate will be the average of the quotations (rounded upwards to the
nearest 1/100%). If no such quotation can be obtained, the rate will be Base
Rate.

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

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

             "Liquidity Indemnitee" means (i) the Liquidity Provider, (ii) each
              --------------------
Affiliate of the Liquidity Provider, (iii) the directors, officers, employees,
servants and agents of the Liquidity Provider and its Affiliates, and (iv) the
successors and permitted assigns of the persons described in clauses (i) through
(iii), inclusive.

             "Liquidity Provider" has the meaning specified in the recital of
              ------------------
parties to this Agreement.

             "London Reference Banks" means the principal London offices of
              ----------------------
National Westminster Bank PLC, the Mitsubishi Trust and Banking Corporation and
ABN AMRO Bank N.V., or such other bank or banks as may from time to time be
agreed to by United and the Liquidity Provider.

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

                                       5
<PAGE>

             "Maximum Commitment" means initially $37,721,782, as the same may
              ------------------
be reduced from time to time in accordance with Section 2.04(a).
                                                ---------------

             "Non-Excluded Tax" has the meaning specified in Section 3.03.
              ----------------                               ------------

             "Non-Extension Advance" means an Advance made 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.
             ------------

             "Owned Aircraft Participation Agreement" means, with respect to the
              --------------------------------------
Equipment Note Indenture pertaining to each Owned Aircraft, the "Participation
Agreement" referred to therein.

             "Participating Institution" has the meaning specified in Section
              -------------------------                               -------
7.08(b).
-------

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

             "Prospectus Supplement" means the Prospectus Supplement dated July
              ---------------------
19, 2000 relating to the Certificates, as such Prospectus Supplement may be
amended or supplemented.

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

             "Regulatory Change" has the meaning specified in Section 3.01.
              -----------------                               ------------

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

             "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 A-2 Certificates on the basis of a 360-day year
comprised of twelve 30-day months, that would be payable on the Class A-2
Certificates on each of the three successive semiannual Regular Distribution
Dates 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 A-2 Certificates on
such day and without regard to expected future payments of principal on the
Class A-2 Certificates.

                                       6
<PAGE>

             "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 A-2 Certificates have been paid in
full (or provision has been made for such payment in accordance with the
Intercreditor Agreement and the Trust Agreement) 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 and United of a Termination Notice from the Liquidity Provider
pursuant to Section 6.01; 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 V to this Agreement.
               -------
             "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 specified in Section 2.05.
              --------------                               ------------

             "Withdrawal Notice" has the meaning specified in Section 2.10.
              -----------------                               ------------

             (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:

         "747 Leased Aircraft," "Acceleration," "Additional Payments,"
          -------------------    ------------    -------------------
         "Affiliate," "Certificates," "Class A-1 Certificates," "Class A-2 Cash
          ---------    ------------    ----------------------    --------------
         Collateral Account,""Class A-2 Certificates," "Class A-2 Trust,"
         ------------------   ----------------------    ---------------
         "Class A-2 Trust Agreement," "Class A-2 Trustee," "Class A-2
          -------------------------    -----------------    ----------
         Certificates," "Class B Certificates," "Class C-1 Certificates,"
         ------------    --------------------    ----------------------
         "Closing Date," "Controlling Party," "Distribution Date," "Downgraded
          ------------    -----------------    -----------------    ----------
         Facility," "Equipment Note Indenture," "Equipment Notes," "Fee Letter,"
         --------    ------------------------    ---------------    ----------
         "Final Maturity Date," "Indenture," "Investment Earnings," "Leased
          -------------------    ---------    -------------------    ------
         Aircraft", "Liquidity Facility," "Liquidity Obligations," "Moody's,"
         --------    ------------------    ---------------------    -------
         "Non-Extended
          ------------

                                       7
<PAGE>

         Facility," "Note Purchase Agreements," "Operative Agreements," "Owned
         --------    ------------------------    --------------------    -----
         Aircraft", "Participation Agreements," "Performing Equipment Note,"
         --------    ------------------------    -------------------------
         "Person," "Pool Balance," "Rating Agency," "Regular Distribution Date,"
          ------    ------------    -------------    -------------------------
         "Replacement Liquidity Facility," "Responsible Officer," "Scheduled
          ------------------------------    -------------------    ---------
         Payment," "Special Payment," "Standard & Poor's," "Stated Interest
         -------    ---------------    -----------------    ---------------
         Rate," "Subordination Agent," "Taxes," "Threshold Rating," "Triggering
         ----    -------------------    -----    ----------------    ----------
         Event," "Trust Agreement," "Trustee," "Underwriter," "Underwriting
         -----    ---------------    -------    -----------    ------------
         Agreement," "United," "United Bankruptcy Event" and "Written Notice."
         ---------    ------    -----------------------       --------------

                                  ARTICLE II

                      AMOUNT AND TERMS OF THE COMMITMENT

             Section  2.01  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) in an aggregate amount at any time
outstanding not to exceed the Maximum Commitment.

             Section 2.02  Making the Advances.  (a) Each "Interest Advance"
                           -------------------             ----------------
shallbe made in a single Borrowing by delivery to the Liquidity Provider of a
written and completed Notice of Borrowing in substantially the form of Annex I,
                                                                       -------
signed by a Responsible Officer of the Borrower, such Interest Advance in an
amount not exceeding the Maximum Available Commitment at such time and shall be
used solely for the payment when due of interest on the Class A-2 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 Available 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 Available Commitment shall be
reinstated by the amount of such repaid Interest Advance, but not to exceed the
Maximum Commitment; provided, however, that the Maximum Available 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 Equipment 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)

                                       8
<PAGE>

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 Available
Commitment at such time, and shall be used to fund the Class A-2 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 upon
                     -----------------
a downgrading of the Liquidity Provider's relevant debt rating issued by either
Rating Agency below the applicable Threshold Rating (as provided for in Section
3.6(c) of the Intercreditor Agreement) unless a Replacement Liquidity Facility
shall have been 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 Annex III, signed by a Responsible
                                          ---------
Officer of the Borrower, in an amount equal to the Maximum Available Commitment
at such time, and shall be used to fund the Class A-2 Cash Collateral Account in
accordance with said Section 3.6(c) and Section 3.6(f). Upon such downgrading,
the Liquidity Provider shall promptly deliver notice thereof to the Borrower,
the Trustee and United.

             (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, by delivery to the Liquidity Provider of a written and
            ------------
completed Notice of Borrowing in substantially the form of Annex IV, signed by a
                                                           --------
Responsible Officer of the Borrower, in an amount equal to the Maximum Available
Commitment at such time, and shall be used to fund the Class A-2 Cash Collateral
Account (in accordance with Section 3.6(f) and Section 3.6(i) 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 11:00 a.m. (Chicago 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, before 4:00 p.m.
(Chicago time) on the date of such Borrowing or on such later Business Day
specified by the Borrower in such Notice of Borrowing, make available for the
account of its Lending Office, in U.S. dollars and in immediately available
funds, the amount of such Borrowing to be paid to the Borrower in accordance
with its payment instructions. If a Notice of Borrowing is delivered by the
Borrower in respect of any Borrowing after 11:00 a.m. (Chicago time) on a
Business Day, the Liquidity Provider shall, before 11:00 a.m. (Chicago time) on
the first Business Day 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, make available to the Borrower, in accordance with its payment
instructions, in U.S. dollars and in immediately available funds, the amount of
such Borrowing. Payments of proceeds of a Borrowing

                                       9
<PAGE>

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. Each Notice of
Borrowing shall be effective upon delivery of a copy thereof to the Liquidity
Provider's New York Branch at the address specified in Section 7.02.
                                                       ------------

             (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 11:00 a.m. (Chicago 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), Section 2.02(c) or Section 2.02(d) to fund
                    ---------------  ---------------    ---------------
the Class A-2 Cash Collateral Account, the Liquidity Provider shall have no
interest in or rights to the Class A-2 Cash Collateral Account, such Advance or
any other amounts from time to time on deposit in the Class A-2 Cash Collateral
Account; provided, however, 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 and provided further, that
                                                         -------- -------
the foregoing shall not affect or impair the rights of the Liquidity Provider to
provide written instructions with respect to the investment and reinvestment of
the Cash Collateral Accounts to the extent provided in Section 2.2(b) 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 Fee Letter.

             Section 2.04  Automatic Reductions and Termination of the Maximum
                           ---------------------------------------------------
Commitment.
----------

             (a)  Automatic Reductions. Promptly following each date on which
                  --------------------
the Required Amount is reduced as a result of a reduction in the Pool Balance of
the Class A-2 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

                                       10
<PAGE>

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, 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; provided, however, 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 Available 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 an Applied Non-Extension Advance,
as the case may be, for all purposes of this Agreement (including, 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.

             Section 2.06 Repayments of Provider Advances. (a) Amounts advanced
                          -------------------------------
hereunder in respect of a Provider Advance shall be deposited in the Class A-2
Cash Collateral Account, invested and withdrawn from the Class A-2 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 A-2 Cash
Collateral Account for the purpose of paying interest on the Class A-2
Certificates in accordance with Section 3.6(f) of the Intercreditor Agreement
(the amount of any such withdrawal being (y) in the case of a Downgrade Advance,
an "Applied Downgrade Advance" and (z) 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
             ------------------------

                                       11
<PAGE>

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; and provided, further, that if, following the making of a Provider
             --------  -------
Advance, the Liquidity Provider delivers a Termination Notice to the Borrower
pursuant to Section 6.01, 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 and the obligation for repayment
thereof. Subject to Sections 2.07 and 2.09 hereof, immediately upon the
                    -------------     ----
withdrawal of any amounts from the Class A-2 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 the
amount of such reduction, plus interest on the principal amount prepaid as
provided in Section 3.07.
            ------------

             (b)  At any time when an Applied Provider Advance (or any portion
thereof) is outstanding, upon the deposit in the Class A-2 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 amount of 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
principal amount of all outstanding 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 A-2 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 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 the order of priority required by the
applicable provisions of Articles II and III of the Intercreditor Agreement or,
if not provided for in the Intercreditor Agreement, then in such manner as the
Liquidity Provider shall deem appropriate.

                                       12
<PAGE>

             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 amounts
received by it that constitute Scheduled Payments or Special Payments or
payments under Sections 7(b) and 7(c) of the Leased Aircraft Participation
Agreement, Section 7(c) of the 747 Leased Aircraft Participation Agreement,
Section 5(b) of the Owned Aircraft Participation Agreement and Section 7 of the
747 Leased Equipment Note Purchase Agreement, Sections 5(i), 7 and 9 of the AFE
Note Purchase Agreement and Sections 4(i) and 7 of the United Equipment 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 shall 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 or the Intercreditor
Agreement. Amounts on deposit in the Class A-2 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 Expiry Date. No earlier than the 60th
                           ------------------------
day and no later than the 40th day prior to the then effective Expiry Date
(unless such Expiry Date is on or after the date that is 15 days after the Final
Maturity Date for the Class A-2 Certificates), the Borrower shall request that
the Liquidity Provider extend the Expiry Date to the earlier of (i) the date
that is 15 days after the Final Maturity Date for the Class A-2 Certificates and
(ii) the date that is the day immediately preceding the 364th day occurring
after the last day of the Consent Period (as hereinafter defined). Whether or
not the Borrower has made such request, the Liquidity Provider shall advise the
Borrower, no earlier than the 40th day (or, if earlier, the date of the
Liquidity Provider's receipt of such request, if any, from the Borrower) and no
later than the 25th day prior to the then effective Expiry Date (such period the
"Consent Period"), whether, in its sole discretion, it agrees to so extend the
 --------------
Expiry Date. If the Liquidity Provider advises the Borrower on or before the
date on which the Consent Period ends that such Expiry Date shall not be so
extended, or fails to irrevocably and unconditionally advise the Borrower on or
before the date on which the Consent Period ends that such Expiry Date shall be
so extended (and, in each case, if the Liquidity Provider shall not have

                                       13
<PAGE>

been replaced in accordance with Section 3.6(e) of the Intercreditor Agreement),
the Borrower shall be entitled on and after the date on which the Consent Period
ends (but prior to the then effective Expiry Date) to request a Non-Extension
Advance in accordance with Section 2.02(b) and Section 3.6(d) of the
                           ---------------
Intercreditor Agreement.

                                  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 costs incurred by the Liquidity
Provider which are attributable to its making or maintaining any 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, or municipal, or any foreign laws or
regulations, or the adoption or making after such date of any interpretation,
regulation, directive, guideline, requirement or request whether or not having
the force of law, by any court or governmental or monetary authority charged
with the interpretation or administration thereof (a "Regulatory Change"),
                                                      -----------------
which: (1) changes the basis of taxation of any amounts payable to the Liquidity
Provider under this Agreement in respect of any such Advances or such obligation
(other than Excluded Taxes or any Non-Excluded Taxes; or (2) imposes or modifies
any reserve, special deposit, compulsory loan or similar requirements relating
to any extensions of credit or other assets of, or any deposits with other
liabilities of, the Liquidity Provider (including any such Advances or such
obligation or any deposits referred to in the definition of LIBOR or related
definitions). The Liquidity Provider agrees to use reasonable efforts
(consistent with its internal policy and 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 3.01 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 shall notify the Borrower of any event
occurring after the date of this Agreement that shall 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 3.01. 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

                                       14
<PAGE>

compensate the Liquidity Provider in respect of any Additional Costs, shall be
prima facie evidence of the amount owed under this Section 3.01.
                                                   ------------

             Notwithstanding the preceding two paragraphs, the Liquidity
Provider and the Subordination Agent agree that any permitted assignee or
participant of the initial Liquidity Provider that is not a bank shall not be
entitled to the benefits of the preceding two paragraphs (but without limiting
the provisions of Section 7.08 hereof).
                  ------------

             Section 3.02 Capital Adequacy. If (1) compliance with any
                          ----------------
judicial, administrative or other governmental interpretation of any law or
regulation or (2) compliance by the Liquidity Provider or any corporation
controlling the Liquidity Provider with any guideline or request from any
central bank or other governmental authority (whether or not having the force of
law) has the effect of requiring an increase in the amount of capital required
or expected 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 such additional amount 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 the need for, or reduce the
amount of, any amount payable under this Section 3.02 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 shall notify the Borrower of any event
occurring after the date of this Agreement that shall 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 3.02. 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
                                                                       -------
3.02.
----

             Notwithstanding the preceding two paragraphs, the Liquidity
Provider and the Subordination Agent agree that any permitted assignee or
participant of the initial Liquidity Provider that is not a bank shall not be
entitled to the benefits of the preceding two paragraphs (but without limiting
the provisions of Section 7.08 hereof).
                  ------------

             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 Taxes, excluding Excluded Taxes (such non-
excluded taxes being referred to herein, collectively, as "Non-Excluded Taxes").
                                                           ------------------
If any Non-Excluded Taxes are required to be withheld or deducted from any
amounts payable to the Liquidity Provider under this Agreement, the Borrower

                                       15
<PAGE>

shall (i) within the time prescribed therefor by applicable law pay to the
appropriate governmental or taxing authority the full amount of any such Non-
Excluded Taxes (and any additional Non-Excluded Taxes in respect of the payment
required under clause (ii) below) 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 Liquidity Provider an additional amount which (after
deduction of all such Non-Excluded Taxes) shall be sufficient to yield to the
Liquidity Provider 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 Borrower shall furnish to the Liquidity Provider the
original or a certified copy of (or other documentary evidence of) the payment
of the Non-Excluded Taxes applicable to such payment. 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 such
additional amounts that may thereafter accrue and would not, in the reasonable
judgment of the Liquidity Provider, be otherwise materially disadvantageous to
the Liquidity Provider or require the Liquidity Provider to incur any cost or
expenses for which it is not indemnified by the Borrower. The Liquidity Provider
shall deliver to the Borrower such certificates and documents as may be
reasonably requested by the Borrower and required by applicable law to establish
that payments hereunder are exempt from (or entitled to a reduced rate of)
withholding Tax.

             (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
additional amounts payable 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) shall 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 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.

             (c)  If any exemption from, or reduction in the rate of, any Taxes
is reasonably available to the Borrower to establish that payments under this
Agreement are exempt from (or entitled to a reduced rate of) tax, the Borrower
shall deliver to the Liquidity Provider such form or forms and such other
evidence of the eligibility of the Borrower for such exemption or reduction as
the Liquidity Provider may reasonably identify to the Borrower as being required
as a condition to exemption from, or reduction in the rate of, any Taxes.

                                       16
<PAGE>

          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. (Chicago
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, ABA No.
021000089, for credit to Helaba, account no. 10920118, ref: United Airlines
2000-1A-2 account 4111308.

          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 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 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 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 shall 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 A-2 Cash Collateral
Account to pay interest on the Class A-2 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 A-2 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 applicable 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 shall not reduce the rate of interest payable
pursuant to this Section 3.07 below the maximum rate
                 ------------

                                                       UAL EETC SERIES 2000-1A-2
                                                      REVOLVING CREDIT AGREEMENT

                                       17
<PAGE>

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.
                                   ------------
Nothing contained in this Section 3.07 shall require the Borrower to pay any
                          ------------
amount under this Section 3.07 other than to the extent the Borrower shall have
                  ------------
funds available therefor.

          (b)  Except as provided in Section 3.07(e), each Advance shall be
                                     ---------------
either a Base Rate Advance or a LIBOR Advance as provided in this Section or
                                                                  -------
Section 3.10. Each such Advance shall 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, however, 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 A.M. (New York
                      ------------
time) on the first Business Day following the Borrower's receipt of the
applicable Termination Notice, 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 LIBOR 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 outstanding applied Non-Extension Advance shall bear
interest in an amount equal to the Investment Earnings on amounts on deposit in
the Class A-2 Cash Collateral Account plus the Applicable Margin for such
period, payable in arrears on each Regular Distribution Date.

                                                       UAL EETC SERIES 2000-1A-2
                                                      REVOLVING CREDIT AGREEMENT

                                       18
<PAGE>

          (f)  Each amount not paid 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 1.00% per annum.

          (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. Subject to Section 5.02, from
                       -----------------------             ------------
time to time and subject to the successor Borrower's meeting the eligibility
requirements set forth in Section 6.9 of the 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 VI (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, any conversion of a LIBOR
     Advance to a Base Rate Advance or a conversion of a LIBOR Advance to an
     Advance bearing interest in accordance with Section 3.07(e), in any case 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

                                                       UAL EETC SERIES 2000-1A-2
                                                      REVOLVING CREDIT AGREEMENT

                                       19
<PAGE>

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, each dated such date, and in the case
     of each document delivered pursuant to paragraphs (i), (ii) and (iii), in
                                            --------------  ----     -----
     form and substance satisfactory to the Liquidity Provider:

     (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 (other than
this Agreement and the Intercreditor Agreement);

     (iv)  A copy of the Prospectus Supplement and specimen copies of the Class
A-2 Certificates;

     (v)   An executed copy of each opinion, document, instrument and
certificate delivered pursuant to the Class A-2 Trust Agreement, the
Intercreditor Agreement, the Note Purchase Agreements and the other Operative
Agreements (together with, in the case of each such opinion, other than the
opinion of counsel for the Underwriters, 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

                                                       UAL EETC SERIES 2000-1A-2
                                                      REVOLVING CREDIT AGREEMENT

                                       20
<PAGE>

interest, remedies, powers, privileges, liens and security interests of, or for
the benefit of, the Trustee and the Liquidity Provider created by the Operative
Agreements;

     (vii)  An agreement from United, pursuant to which United agrees to provide
copies of its Quarterly Reports on Form 10-Q and Annual Reports on Form 10-K to
the Liquidity Provider promptly after becoming publicly available; and

     (viii) Such other documents, instruments, opinions and approvals as the
Liquidity Provider shall have reasonably requested.

            (b)   The following statements shall be true on and as of the
Effective Date:

     (i)    The representations and warranties in the Note Purchase Agreements
and each of the Participation Agreements are true and correct on and as of the
Effective Date as though made on and as of the Effective Date;

     (ii)   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; and

     (iii)  There has been no material adverse change in the financial condition
or results of operations of United and its subsidiaries taken as a whole since
December 31, 1999.

            (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 Underwriter under the Underwriting
     Agreement shall have been satisfied (unless any of such conditions
     precedent shall have been waived by the Underwriter).

            (e)  The Borrower shall have received 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

                                                       UAL EETC SERIES 2000-1A-2
                                                      REVOLVING CREDIT AGREEMENT

                                       21
<PAGE>

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.

                                   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 shall, unless the Liquidity
Provider shall otherwise consent in writing:

          (a)  Performance of 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 any Operative Agreement entered into after the date
hereof.

          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 shall not appoint or permit or
suffer to be appointed any successor Borrower without the written consent of the
Liquidity Provider, which consent shall not be unreasonably withheld or delayed.

                                  ARTICLE VI

                          LIQUIDITY EVENTS OF DEFAULT

                                                       UAL EETC SERIES 2000-1A-2
                                                      REVOLVING CREDIT AGREEMENT

                                       22
<PAGE>

          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
Equipment 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) the obligation of the Liquidity Provider to make Advances hereunder to
expire on the fifth Business Day after the date on which such Termination Notice
is received by the Borrower and United, (ii) the Borrower to promptly request,
and the Liquidity Provider to promptly make, a Final Advance in accordance with
Section 2.02(d) and Section 3.6(i) of the Intercreditor Agreement, (iii) all
---------------
other outstanding Advances to 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, 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, 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 sent by telecopier):

          Borrower:    State Street Bank and Trust Company of Connecticut,
                       National Association
                       225 Asylum Street
                       Goodwin Square
                       Hartford, Connecticut 06103
                       Attention: Corporate Trust Division

                       Telephone: 860-244-1844

                       Telecopy: 860-244-1881

                                                       UAL EETC SERIES 2000-1A-2
                                                      REVOLVING CREDIT AGREEMENT

                                       23
<PAGE>

          Liquidity
          Provider:    Landesbank Hessen-Thuringen Girozentrale
                       Main Tower
                       Neue Mainzer Str. 52 - 58
                       60311 Frankfurt am Main
                       Germany
                       Attention: Asset Finance

                       Telephone: 49699132-4882
                       Telecopy: 49699132-4392

with a copy of any Notice of Borrowing to:

                       Landesbank Hessen-Thuringen
                       420 Fifth Avenue, 24th Floor
                       New York, NY 10018
                       Attention: Project Finance, Michael Novack
                       Telephone: 212-703-5224
                       Telecopy:  212-703-5256

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 with receipt confirmed, (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 shall not be effective until received by the Liquidity Provider,
--     ---
subject to the last sentence of Section 2.02(e). 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.

          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

                                                       UAL EETC SERIES 2000-1A-2
                                                      REVOLVING CREDIT AGREEMENT

                                       24
<PAGE>

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 7 of the AFE Note Purchase Agreement, Sections 7(b)
and 7(c) of the Leased Aircraft Participation Agreement, Section 7(c) of the 747
Leased Aircraft Participation Agreement and Section 5(b) of the Owned Aircraft
Participation 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 (including the expenses set forth in
Section 7 of the 747 Leased Equipment Note Purchase Agreement, Section 9 of the
AFE Note Purchase Agreement and Section 7 of the United Equipment Note Purchase
Agreement) of any kind or nature whatsoever (other than any Expenses of the
nature described in Section 3.01, 3.02 or 7.07 hereof or in the Fee Letter
                    ------------  ----    ----
(regardless of whether indemnified against pursuant to said Sections or in such
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 Intercreditor
Agreement, the Fee Letter or any Participation 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 to the extent such Expense is (i) 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 Fee Letter or any other Operative Agreement to which it is a
party. The indemnities and cost provisions contained in Section 7 of the AFE
Note Purchase Agreement, Section 5(i) of the 747 Leased Equipment Note Purchase
Agreement, Section 4(i) of the United Equipment Note Purchase Agreement,
Sections 7(b) and 7(c) of the Leased Aircraft Participation Agreement, Section
7(c) of the 747 Leased Aircraft Participation Agreement, and Section 5(b) of the
Owned Aircraft Participation Agreement and the provisions of Sections 3.01,
                                                             -------------
3.02, 3.03, 3.09 7.05 and 7.07 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, directors, employees 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 the Liquidity Provider, and the

                                                       UAL EETC SERIES 2000-1A-2
                                                      REVOLVING CREDIT AGREEMENT

                                       25
<PAGE>

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 complying with the terms
and conditions hereof.

          (b)  Neither the Liquidity Provider nor any of its officers,
employees, directors 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
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 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, including, without limitation, the reasonable
fees and expenses of outside counsel for the Liquidity Provider and (B) on
demand, all reasonable costs and expenses of the Liquidity Provider (including
reasonable counsel fees and expenses) 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
Document or otherwise affecting the application of funds in the Class A-2 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 the
                                                         ------------
Borrower (except as contemplated by Section 3.08) shall have the right to
                                    ------------

                                                       UAL EETC SERIES 2000-1A-2
                                                      REVOLVING CREDIT AGREEMENT

                                       26
<PAGE>

assign its rights or obligations 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 and under the other Operative Agreements to such Persons (other
than United or any of its Affiliates) as 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, shall 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 and the like as they pertain to the Liquidity Provider shall be
deemed also to include those of each of its participants that are banks
(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 other than a
result of a change in law following the date of any participation).

     (b)  If, pursuant to Section 7.08(a) above, the Liquidity Provider sells
                          ---------------
any participation in this Agreement to any bank or other entity (each, a
"Participating Institution"), then, concurrently with the effectiveness of such
 -------------------------
participation, the Participating Institution 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 shall be
required to be withheld by the Borrower or the Liquidity Provider with respect
to any payments to be made to such Participating Institution 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-8ECI or Form W-8BEN, as
appropriate, or other applicable form, certificate or document prescribed by the
Internal Revenue Service certifying, in each case, such Participating
Institution'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-8ECI or Form W-
8BEN, 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- 8BEN or Form W-8ECI that such Participating Institution 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) from
the Participating Institution indicating that payments hereunder are not subject
to United States

                                                       UAL EETC SERIES 2000-1A-2
                                                      REVOLVING CREDIT AGREEMENT

                                       27
<PAGE>

federal withholding tax, the Borrower shall withhold taxes as required by law
from such payments at the applicable statutory rate without any obligation to
make additional payments under Section 3.03.
                               ------------

          (c)  Notwithstanding the other provisions of this Section 7.08, the
                                                            ------------
Liquidity Provider may assign and pledge all or any portion of the Advances
owing to it to any Federal Reserve Bank or the United States Treasury as
collateral security pursuant to Regulation A of the Board of Governors of the
Federal Reserve System and any Operating Circular issued by such Federal Reserve
Bank, provided that any payment in respect of such assigned Advances made by the
Borrower to the Liquidity Provider in accordance with the terms of this
Agreement shall satisfy the Borrower's obligations hereunder in respect of such
assigned Advance to the extent of such payment. No such assignment shall release
the Liquidity Provider from its obligations hereunder.

          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 the extent of such prohibition,
unenforceability or non-authorization 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 LAWS OF THE STATE OF NEW YORK (WITHOUT REGARD
TO THE PRINCIPLES OF CONFLICTS OF LAWS THEREOF (OTHER THAN SECTION 5-1401 OF THE
NEW YORK GENERAL OBLIGATIONS LAW)) AND THE OBLIGATIONS, RIGHTS AND REMEDIES OF
THE PARTIES UNDER THIS AGREEMENT SHALL BE DETERMINED IN ACCORDANCE WITH SUCH
LAWS.

          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 non-exclusive 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;

                                                       UAL EETC SERIES 2000-1A-2
                                                      REVOLVING CREDIT AGREEMENT

                                       28
<PAGE>

          (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 of mail), postage prepaid, to each party
     hereto at its address set forth in Section 7.02, 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.

          (c)   The Liquidity Provider hereby waives any immunity it may have
from the jurisdiction of the courts of the United States or of any State and
waives any immunity any of its properties located in the United States may have
from attachment or execution upon a judgment entered by any such court under the
United States Foreign Sovereign Immunities Act of 1976 or any similar successor
legislation.

          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 counterpart, 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 and the other Operative
                        --------
Agreements 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.

                                                       UAL EETC SERIES 2000-1A-2
                                                      REVOLVING CREDIT AGREEMENT

                                       29
<PAGE>

          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.

                                                       UAL EETC SERIES 2000-1A-2
                                                      REVOLVING CREDIT AGREEMENT

                                       30
<PAGE>

     IN WITNESS WHEREOF, the parties hereto 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.

                                         STATE STREET BANK AND TRUST COMPANY OF
                                         CONNECTICUT, NATIONAL ASSOCIATION, not
                                         in its individual capacity but solely
                                         as Subordination Agent and Trustee, as
                                         Borrower

                                         By:______________________________
                                            Name:
                                            Title:

                                                       UAL EETC SERIES 2000-1A-2
                                                      REVOLVING CREDIT AGREEMENT

                                      S-1
<PAGE>

                                         LANDESBANK HESSEN-THURINGEN
                                         GIROZENTRALE,
                                          as Liquidity Provider

                                         By:__________________________________
                                            Name:
                                            Title:

                                                       UAL EETC SERIES 2000-1A-2
                                                      REVOLVING CREDIT AGREEMENT

                                      S-2
<PAGE>

                                                                      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 Landesbank Hessen-Thuringen Girozentrale
      --------
(the "Liquidity Provider"), with reference to the Revolving Credit Agreement,
      ------------------
dated as of July 31, 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 for the
     payment of interest on the Class A-2 Certificates which was payable on
     _____________________ in accordance with the terms and provisions of the
     Class A-2 Trust Agreement and the Class A-2 Certificates, which Advance is
     requested to be made on _______________. The Interest Advance should be
     transferred to account __________.

          (3)  The amount of the Interest Advance requested hereby (i) is
     $__________, to be applied in respect of the payment of interest which was
     due and payable on the Class A-2 Certificates on such Distribution Date,
     (ii) does not include any amount with respect to the payment of principal
     of, or Additional Payments on, the Class A-1 Certificates, the Class A-2
     Certificates, the Class B Certificates, the Class C-1 Certificates or the
     Class C-2 Certificates, or interest on the Class A-1 Certificates, the
     Class B Certificates, the Class C-1 Certificates or the Class C-2
     Certificates, (iii) was computed in accordance with the provisions of the
     Class A-2 Certificates, the Class A-2 Trust Agreement and the Intercreditor
     Agreement (a copy of which computation is attached hereto as Schedule I),
                                                                  ----------
     (iv) does not exceed the Maximum Available Commitment on the date hereof,
     and (v) 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 shall 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.

                                      I-1
<PAGE>

     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 Maximum Available 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 Notice of Borrowing 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 ____________, ___.

                                            STATE STREET BANK AND TRUST COMPANY
                                            OF CONNECTICUT, NATIONAL
                                            ASSOCIATION, not in its individual
                                            capacity but solely as Subordination
                                            Agent, as Borrower

                                            By:_________________________________
                                               Name:
                                               Title:

                                      I-2
<PAGE>

              SCHEDULE I TO INTEREST ADVANCE NOTICE OF BORROWING

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

                                      I-3
<PAGE>

                                                                     Annex II to
                                                      Revolving Credit Agreement

                   NON-EXTENSION ADVANCE NOTICE OF BORROWING

          The undersigned, a duly authorized signatory of the undersigned
borrower (the "Borrower"), hereby certifies to Landesbank Hessen-Thuringen
               --------
Girozentrale (the "Liquidity Provider"), with reference to the Revolving Credit
                   ------------------
Agreement, dated as of July 31, 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 A-2 Cash Collateral Account in accordance with
     Section 3.6(d) of the Intercreditor Agreement, which Advance is requested
     to be made on __________, ____. The Non- Extension Advance should be
     transferred to ____________.

          (3)  The amount of the Non-Extension Advance requested hereby (i) is
     $_______________.__, which equals the Maximum Available Commitment on the
     date hereof and is to be applied in respect of the funding of the Class A-2
     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 Additional Payments on, the Class A-1
     Certificates, the Class A-2 Certificates, the Class B Certificates, the
     Class C-1 Certificates or the Class C-2 Certificates, or interest on the
     Class A-1 Certificates, the Class B Certificates, the Class C-1
     Certificates or the Class C-2 Certificates, (iii) was computed in
     accordance with the provisions of the Class A-2 Certificates, the Class A-2
     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 A-
     2 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

                                     II-1
<PAGE>

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 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 _________, ____.

                                           STATE STREET BANK AND TRUST COMPANY
                                           OF CONNECTICUT, NATIONAL ASSOCIATION,
                                           not in its individual capacity but
                                           solely as Subordination Agent, as
                                           Borrower

                                           By:__________________________________
                                              Name:
                                              Title:

                                     II-2
<PAGE>

                      SCHEDULE I TO NON-EXTENSION ADVANCE
                              NOTICE OF BORROWING
                [Insert copy of computations in accordance with
                  Non-Extension Advance Notice of Borrowing]

                                     II-3
<PAGE>

                                                                    Annex III to
                                                      Revolving Credit Agreement

                     DOWNGRADE ADVANCE NOTICE OF BORROWING

     The undersigned, a duly authorized signatory of the undersigned borrower
(the "Borrower"), hereby certifies to Landesbank Hessen-Thuringen Girozentrale
      --------
(the "Liquidity Provider"), with reference to the Revolving Credit Agreement
      ------------------
dated as of July 31, 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 A-2 Cash Collateral Account in accordance with
     Section 3.6(c) of the Intercreditor Agreement by reason of the downgrading
     of the relevant rating of the Liquidity Provider issued by either Rating
     Agency below the Threshold Rating, which Advance is requested to be made on
     ______________. The Downgrade Advance should be transferred to __________.

          (3)  The amount of the Downgrade Advance requested hereby (i) is
     $________, which equals the Maximum Available Commitment on the date hereof
     and is to be applied in respect of the funding of the Class A-2 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
     principal of, or Additional Payments on, the Class A-1 Certificates, the
     Class A-2 Certificates, the Class B Certificates, the Class C-1
     Certificates or the Class C-2 Certificates or interest on the Class A-1
     Certificates, the Class B Certificates, the Class C-1 Certificates or the
     Class C-2 Certificates, (iii) was computed in accordance with the
     provisions of the Class A-2 Certificates, the Class A-2 Trust Agreement and
     the Intercreditor Agreement (a copy of which computation is attached hereto
     as Schedule 1), 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 shall deposit such amount in the Class
     A-2 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.

                                     III-1
<PAGE>

          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 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 _________, _____.

                                         STATE STREET BANK AND TRUST COMPANY
                                         CONNECTICUT, NATIONAL ASSOCIATION, not
                                         in its individual capacity but solely
                                         as Subordination Agent, as Borrower

                                         By:____________________________________
                                            Name:
                                            Title:

                                     III-2
<PAGE>

              SCHEDULE I TO DOWNGRADE ADVANCE NOTICE OF BORROWING

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

                                     III-3
<PAGE>

                                                                     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 Landesbank Hessen-Thuringen
               --------
Girozentrale (the "Liquidity Provider"), with reference to the Revolving Credit
                   ------------------
Agreement, dated as of July 31, 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 A-2 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 Available Commitment on the date
     hereof and is to be applied in respect of the funding of the Class A-2 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 Additional Payments on the Class A-1 Certificates, the
     Class A-2 Certificates, the Class B Certificates, the Class C-1
     Certificates or the Class C-2 Certificates, or interest on the Class A-1
     Certificates, the Class B Certificates, the Class C-1 Certificates or the
     Class C-2 Certificates, (iii) was computed in accordance with the
     provisions of the Class A-2 Certificates, the Class A-2 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 shall deposit such amount in the Class
     A-2 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.
<PAGE>

          (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/

          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 ___________, _____.

                                         STATE STREET BANK AND TRUST COMPANY OF
                                          CONNECTICUT, NATIONAL ASSOCIATION, not
                                          in its individual capacity but solely
                                          as Subordination Agent, as Borrower

                                         By:____________________________________
                                            Name:
                                            Title:

____________________

/1//  Bracketed language may be included at Borrower's option.
 -
<PAGE>

                SCHEDULE I TO FINAL ADVANCE NOTICE OF BORROWING

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

                                                                      Annex V to
                                                      Revolving Credit Agreement

                             NOTICE OF TERMINATION

                                    [Date]

State Street Bank and Trust Company
of Connecticut, National Association,
  as Subordination Agent, as Borrower
225 Asylum Street
Goodwin Square
Hartford, Connecticut 06103

Attention: Corporate Trust Administration

Re:  Revolving Credit Agreement, dated as of July 31, 2000, between State Street
     Bank and Trust Company of Connecticut, National Association, as
     Subordination Agent, as agent and trustee for the United Airlines 2000-1A-2
     Pass Through Trust, as Borrower, and Landesbank Hessen-Thuringen
     Girozentrale (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 a
Performing Equipment 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.

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

                                         Very truly yours,

                                         LANDESBANK HESSEN-THURINGEN
                                         GIROZENTRALE,
                                         as Liquidity Provider

                                         By:___________________________________
                                            Name:
                                            Title:

cc:  State Street Bank and Trust Company
     of Connecticut, National Association, as Trustee
<PAGE>

                                                                     Annex VI to
                                                      Revolving Credit Agreement

                   NOTICE OF REPLACEMENT SUBORDINATION AGENT

                                    [Date]

Attention:

Re:  Revolving Credit Agreement, dated as of July 31, 2000, between State Street
Bank and Trust Company of Connecticut, National Association, as Subordination
Agent, as agent and trustee for the United Airlines 2000-1A-2 Pass Through
Trust, as Borrower, and Landesbank Hessen-Thuringen Girozentrale (the "Liquidity
                                                                       ---------
Agreement")
---------

Ladies and Gentlemen:

For value received, the undersigned hereby irrevocably transfers to:

                              ________________________________
                                   [Name of Transferee]

                              ________________________________
                                   [Address of Transferee]

all rights and obligations of the undersigned as Borrower and Subordination
Agent under the Liquidity Agreement referred to above. The transferee has
succeeded the undersigned as Borrower and 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 and
Subordination Agent under the Liquidity Agreement are transferred to the
transferee and the transferee shall hereafter have the sole rights and
obligations as Borrower and Subordination Agent thereunder. The undersigned
shall pay any costs and expenses of such transfer, including, but not limited
to, transfer taxes or governmental charges.
<PAGE>

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

                                         STATE STREET BANK AND TRUST COMPANY OF
                                         CONNECTICUT, NATIONAL ASSOCIATION not
                                         in its individual capacity but solely
                                         as Subordination Agent, as Borrower

                                         By:____________________________________
                                            Name:
                                            Title:

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