Document:

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                                                                    EXHIBIT 10.6

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                    STANDBY SERVICING, ADMINISTRATIVE AGENCY
                          AND CASH MANAGEMENT AGREEMENT

                                      among

                         debis Aircraft Leasing Limited

                             debis AirFinance B.V.,
                                  as Guarantor

                                       and

                                  AerCo Limited

                            Dated as of July 17, 2000

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<PAGE>   2

         STANDBY SERVICING, ADMINISTRATIVE AGENCY AND CASH MANAGEMENT AGREEMENT
dated as of July 17, 2000 (this "AGREEMENT"), among debis Aircraft Leasing
Limited, a limited company organized under the laws of Ireland (the "STANDBY
SERVICER"), debis AirFinance B.V., a limited company organized under the laws of
The Netherlands (the "GUARANTOR"), and AerCo Limited, a company incorporated
under the laws of Jersey (the "COMPANY").

         WHEREAS, the Company has entered into a Servicing Agreement (the "AerFi
SERVICING AGREEMENT") dated as of July 17, 2000 with, among others, AerFi Group
plc (the "SERVICER").

         WHEREAS, the Company has entered into an Amended and Restated
Administrative Agency Agreement dated as of July 17, 2000, with, among others,
AerFi Administrative Services Limited (the "AerFi ADMINISTRATIVE AGENCY
AGREEMENT").

         WHEREAS, the Company has entered into an Amended and Restated Cash
Management Agreement, dated as of July 17, 2000, with, among others, AerFi Cash
Manager II Limited (the "AerFi CASH MANAGEMENT AGREEMENT").

         WHEREAS, the Company and the Standby Servicer have agreed that the
Standby Servicer will provide the services defined herein on the terms and
conditions set out herein and following the Start Date (as defined below), if
any, subject to the terms and conditions of each of (i) the Servicing Agreement
among the Company, the Standby Servicer, the Guarantor and others dated as of
July 17, 2000 (the "SERVICING AGREEMENT") attached hereto as Annex 1, (ii) the
Administrative Agency Agreement among the Company, the Standby Servicer, the
Guarantor and others dated as of July 17, 2000 (the "ADMINISTRATIVE AGENCY
AGREEMENT") attached hereto as Annex 2 and (iii) the Cash Management Agreement
among the Company, the Standby Servicer, the Guarantor and others dated as of
July 17, 2000 (the "CASH MANAGEMENT AGREEMENT") attached hereto as Annex 3.

         NOW, THEREFORE, for the consideration set forth herein and other good
and valuable consideration, the receipt of which is hereby acknowledged, the
parties hereto agree as follows:

                                    ARTICLE 1
                                   DEFINITIONS

<PAGE>   3

         SECTION 1.01. Definitions. Defined terms in the Servicing Agreement,
the Administrative Agency Agreement and the Cash Management Agreement shall have
the same meanings herein. In addition, the following defined terms shall have
effect:

         "AGREEMENT" has the meaning assigned to such term in the preamble
hereto.

         "COMPANY" has the meaning assigned to such term in the preamble hereto.

         "GUARANTOR" has the meaning assigned to such term in the preamble
hereto.

         "RELATED DOCUMENTS" has the meaning assigned to such term in the
Indenture dated as of July 15, 1998, between the Company and Bankers Trust
Company, a New York banking corporation, not in its individual capacity, but
solely as trustee, as amended or supplemented from time to time.

         "RELEVANT SERVICES" means the Services, the Administrative Services and
the Cash Management Services (as defined, respectively, in the Servicing
Agreement, Administrative Agency Agreement and Cash Management Agreement) which
the Company may require the Standby Servicer to perform hereunder.

         "STANDBY PERIOD" has the meaning specified in Section 4.01 hereof.

         "STANDBY SERVICER" has the meaning assigned to such term in the
preamble hereto.

         "STANDBY TERMINATION FEE" has the meaning specified in Section 5.01
hereof.

         "START DATE" means, the date specified by the Company in the Start
Notice as the date upon which the Standby Servicer is to commence performance of
the Relevant Services, which shall be the date on which the AerFi Servicing
Agreement, the AerFi Administrative Agency Agreement and the AerFi Cash
Management Agreement are anticipated to terminate.

         "START NOTICE" means a notice in writing from the Company to the
Standby Servicer specifying the Start Date in respect of the Relevant Services.

                                    ARTICLE 2

                                       2

<PAGE>   4

                                   APPOINTMENT

         SECTION 2.01. Appointment. The Company hereby appoints the Standby
Servicer as its agent on the terms and conditions set forth in this Agreement to
provide the Relevant Services to the Company and its Subsidiaries with effect
from the Start Date.

         SECTION 2.02. Acceptance of Appointment. The Standby Servicer hereby
accepts such appointment and agrees to perform with effect from the Start Date
the Relevant Services on the terms and subject to the conditions set forth in
this Agreement; provided, however, that it shall not be a condition to the
Standby Servicer's performance of services that it shall have received a Start
Notice.

                                    ARTICLE 3
                                RELEVANT SERVICES

         SECTION 3.01. Relevant Services. The obligations to be performed by the
Standby Servicer are (i) those obligations of the "Servicer" set forth in the
Servicing Agreement, (ii) those obligations of the "Administrative Agent" set
forth in the Administrative Agency Agreement and (iii) those obligations of the
"Cash Manager" set forth in the Cash Management Agreement.

         SECTION 3.02.  Condition.  The obligations of the Standby Servicer set
forth in Section 3.01 above are subject to the issuance by the Company of a
Start Notice.

         SECTION 3.03. Additional Information. (a) The Company shall deliver, or
cause the Servicer to deliver, to the Standby Servicer as soon as available and
in any event within 90 days after each anniversary date of this Agreement prior
to the Start Date, such documentation and reports as shall be agreed between the
Company and the Standby Servicer; (including without limitation all filings by
AerCo under the Securities Exchange Act of 1934) provided, however, that the
Company shall not be required to provide the Standby Servicer with any
information regarding the Leases (other than the identity of the Lessees and
their current performance), sales of aircraft or any marketing of the aircraft
or Leases. The Standby Servicer agrees to review all information provided to
it pursuant to the preceding sentence.

          (b) The Company shall also furnish to the Standby Servicer a copy of
any termination notice delivered or received by the Company under the AerFi

                                        3

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Servicing Agreement, the AerFi Administrative Agency Agreement or the AerFi Cash
Management Agreement.

                                    ARTICLE 4
                                  REMUNERATION

         SECTION 4.01.  Remuneration.  (a) From the date of this Agreement until
the Start Date (the "STANDBY PERIOD"), the Standby Servicer shall be entitled to
a fee of $80,000 (Eighty Thousand US dollars) per annum payable monthly in
arrears.

         (b) From the Start Date, the Standby Servicer shall in its capacity as
servicer, administrative agent and cash manager be entitled to receive such fees
as are payable under, respectively, Article 9 of the Servicing Agreement,
Article 8 of the Administrative Agency Agreement and Article 7 of the Cash
Management Agreement in relation to the Relevant Services performed by the
Standby Servicer.

                                    ARTICLE 5
                           TERMINATION AND RESIGNATION

         SECTION 5.01. Termination. (a) The Standby Servicer shall cease to be
the Standby Servicer hereunder if at any time during the Standby Period, the
Company shall have given 30 days' notice in writing to the Standby Servicer of
the Company's intention to terminate this Agreement; provided, however, that
this Agreement shall not terminate and the Standby Servicer shall not cease to
be the Standby Servicer hereunder unless a replacement standby servicer,
acceptable to the Company and the Rating Agencies shall have been appointed by
the Company. On the date specified in a notice pursuant to the foregoing
sentence, the appointment of the Standby Servicer hereunder shall cease in
accordance with such instructions or notice.

          (b) After the Standby Period, this Agreement shall terminate and the
obligations of the Standby Servicer under each of the Servicing Agreement, the
Administrative Agency Agreement and the Cash Management Agreement shall
terminate upon the date of termination in accordance with the terms of any of
the

                                        4

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Servicing Agreement, the Administrative Agency Agreement and the Cash
Management Agreement.

         SECTION 5.02. Compensation. Any termination under Section 5.01(a)
hereof shall entitle the Standby Servicer to a termination fee of $80,000
(Eighty Thousand US dollars) (the "STANDBY TERMINATION FEE"). The Company may
terminate this Agreement at any time during the Standby Period without the 30
days' notice to the Standby Servicer required under Section 5.01(a) by paying
the Standby Servicer the Standby Termination Fee plus $7,000 (Seven Thousand US
dollars).

         Any such termination shall be without prejudice to the right of the
Standby Servicer to receive any accrued fee or reimbursement of any expense in
accordance with this Agreement and without prejudice to any accrued rights of
the parties hereto. Compensation pursuant to this Section 5.02 shall be payable
on the date of termination.

         SECTION 5.03. Information. Following termination the Standby Servicer
will promptly forward to the Company any notices, reports and communications
received by it from any Lessee under any Lease during the 60 days immediately
after termination.

         SECTION 5.04. Notification of Lessees on Termination. After the Start
Date, if any, the Company will notify promptly the Lessee under each Lease and
any relevant third party in the event of the termination of the Standby Servicer
under this Agreement and request that all notices, reports and communications
thereafter be made or given directly to the Company.

         SECTION 5.05. Co-operation. If the appointment of the Standby Servicer
is terminated hereunder, the Standby Servicer undertakes to co-operate with any
person appointed by the Company in place of the Standby Servicer, including
providing such person with all information and documents reasonably requested
provided that it is indemnified by the Company for any costs and expenses
reasonably incurred in so doing.

         SECTION 5.06. Obligations. Following termination of its appointment
hereunder the Standby Servicer shall have no further obligations hereunder other
than obligations accrued up to the date of termination; provided that the
Standby Servicer shall not be absolved or released from any liability for any
act or failure to act pursuant to this Agreement prior to the date of
termination.

                                    ARTICLE 6

                                        5

<PAGE>   7

                                    GUARANTEE

         SECTION 6.01. Guarantee. The Guarantor hereby fully and unconditionally
guarantees to the Company (i) the due and punctual performance by the Standby
Servicer of all agreements, covenants and other obligations required to be
performed by the Standby Servicer hereunder or under any other Related Document
(including, without limitation, the punctual payment when due of all amounts now
or hereafter payable by the Standby Servicer hereunder or under any other
Related Document) (all such agreements, covenants and other obligations being
the "GUARANTEED OBLIGATIONS"), all in accordance with the terms of this
Agreement and the other Related Documents, and agrees to pay any and all
expenses (including counsel fees and expenses) incurred by any of the parties
hereto or any of their respective officers, directors or agents in enforcing any
right under this Section 6.01 (except costs of AerCo in an enforcement action in
which the remedies sought by AerCo are denied by a final court order). The
liability of the Guarantor under this Section 6.01 is limited to the maximum
amount that will result in the obligations of the Guarantor not constituting a
fraudulent conveyance or fraudulent transfer under applicable law.

         The Guarantor hereby waives diligence, presentment, filing of claims
with a court in the event of merger or bankruptcy of the Standby Servicer, any
right to require a proceeding first against the Standby Servicer, and the
benefit of discussion, protest or notice with respect to any and all demands for
performance or payment hereunder whatsoever (except as specified above), and
covenants that this Article 6 shall not be discharged except by performance or
payment in full of all of the Guaranteed Obligations.

         The Guarantor hereby irrevocably waives any claim or other rights which
it may now or hereafter acquire against the Standby Servicer that arise from the
existence, payment, performance or enforcement of the Guarantor's obligations
under this Agreement or any other Related Document, including, without
limitation, any right of subrogation, reimbursement, exoneration, contribution,
indemnification, any right to participate in any claim or remedy of any party
against the Standby Servicer, whether or not such claim, remedy or right arises
in equity, or under contract, statute or common law, including, without
limitation, the right to take or receive from the Standby Servicer, directly or
indirectly, in cash or other property or in any other manner, payment or
security on account of such claim or other rights, until all of the Guarantor's
obligations under this Agreement have been satisfied. If any amount shall be
paid to the Guarantor in violation of the preceding sentence and this Agreement
shall not have been terminated, such amount shall be deemed to have been paid to
the

                                        6

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Guarantor for the benefit of, and held in trust for the benefit of the Company,
and shall forthwith be paid to the Company. The Guarantor acknowledges that it
will receive direct and indirect benefits from the execution, delivery and
performance by the Standby Servicer of this Agreement and that the waiver set
forth in this paragraph is knowingly made in contemplation of such benefits.

         SECTION 6.02. Reinstatement. The Guarantor hereby agrees that the
guarantee provided for in Section 6.01 hereof shall continue to be effective or
be reinstated, as the case may be, if at any time, payment, or any part thereof,
of any Guaranteed Obligations or interest thereon is rescinded or must otherwise
be restored to the Standby Servicer upon the bankruptcy or insolvency of the
Standby Servicer or the Guarantor or otherwise.

         SECTION 6.03. Unconditional Nature of Guarantee. The Guarantor hereby
agrees that its obligations under the guarantee set forth in Section 6.01 hereof
shall be irrevocable and unconditional, irrespective of the invalidity,
irregularity or unenforceability of this Agreement or any other Related Document
against the Standby Servicer, the absence of any action to enforce the Standby
Servicer's obligations hereunder or under any other Related Document, any waiver
or consent by any party hereto with respect to any provisions thereof, any
amendment to the terms hereof or of any other Related Document, the bankruptcy
of the Standby Servicer or any circumstance which might otherwise constitute a
legal or equitable discharge or defense of a guarantor; provided, however, that
the Guarantor shall be entitled to exercise any right that the Standby Servicer
could have exercised under this Agreement to cure any default in respect of its
obligations hereunder or under any other Related Document, if any, but only to
the extent such right, if any, is provided to the Standby Servicer hereunder or
under any other Related Document.

                                    ARTICLE 7
                                  MISCELLANEOUS

         SECTION 7.01. Term. Unless sooner terminated pursuant to Section 5.01
hereof, this Agreement shall terminate on the date of payment in full of all
amounts outstanding to be paid on the Notes (including the Class D Notes and the
Class E Notes) and any other securities issued by the Company as relating to
Additional Aircraft owned by AerCo Group.

                                        7

<PAGE>   9

         SECTION 7.02. Notices. All notices, consents, directions, approvals,
instructions, requests and other communications shall be in writing, and any
such notices shall become effective upon (i) the earlier of receipt thereof and
five Business Days after being deposited in the mail, certified or registered,
return receipt requested, with appropriate postage prepaid for first class mail
and (ii) receipt if delivered by hand or courier service or by facsimile (and,
in the case of a facsimile, receipt of such facsimile is confirmed to the
sender) and shall be directed to the addresses or facsimile numbers of such
Person set forth below:

         If to the Standby Servicer, to:

         debis Aircraft Leasing Limited
         c/o debis AirFinance B.V.
         Evert van de Beekstraat 312
         NL-1118 CX Schipol Airport
         The Netherlands
         Attention:        Managing Director
         Copy:             General Counsel
         Facsimile:        31-20-6559-100

         If to the Guarantor, to:

         debis AirFinance B.V.
         Evert van de Beekstraat 312
         NL-1118 CX Schipol Airport
         The Netherlands
         Attention:        Managing Director
         Copy:             General Counsel
         Facsimile:        31-20-6559-100

         If to the Company, to:

         AerCo Limited
         22 Grenville Street
         St. Helier
         Jersey, JE4 8PX
         Channel Islands
         Attention:        Mourant & Co. Secretaries
                           Limited - Company Secretary
         Facsimile:        44-1534-609-333

                                        8

<PAGE>   10

         With a copy to:

         AerFi Administrative Services Limited
         as Administrative Agent
         Aviation House
         Shannon
         Co. Clare, Ireland
         Attention:        Company Secretary
         Copy:             General Counsel
         Facsimile:        353-61-360-503

         From time to time either party to this Agreement may designate a new
address or number for purposes of notices hereunder by giving 15 days' notice in
writing.

         SECTION 7.03. Governing Law. This Agreement shall in all respects be
governed by and construed in accordance with the laws (excluding principles of
conflicts of laws) of the State of New York applicable to agreements made and to
be performed entirely within such state, including all matters of construction
validity and performance.

         SECTION 7.04. Jurisdiction; Court Proceedings. The parties hereto agree
that any suit, action or proceeding seeking to enforce any provision of, or
based on any matter arising out of or in connection with, this Agreement or the
transactions contemplated hereby may be brought in the United States District
Court for the Southern District of New York or any other New York State court
sitting in New York City, and each of the parties hereby consents to the
jurisdiction of such courts (and of the appropriate appellate courts therefrom)
in any such suit, action or proceeding and irrevocably waives, to the fullest
extent permitted by law, any objection which it may now or hereafter have to the
laying of the venue of any such suit, action or proceeding in any such court or
that any such suit, action or proceeding which is brought in any such court has
been brought in an inconvenient forum. Process in any such suit, action or
proceeding may be served on any party anywhere in the world, whether within or
without the jurisdiction of any such court. Without limiting the foregoing, each
party agrees that service of process on such party as provided in Section 7.02
or 7.06 hereof shall be deemed effective service of process on such party.

         SECTION 7.05.  Waiver of Jury Trial.  EACH OF THE PARTIES
HERETO HEREBY IRREVOCABLY WAIVES ANY AND ALL RIGHT TO
TRIAL BY JURY IN ANY LEGAL PROCEEDING ARISING OUT OF OR
RELATED TO THIS AGREEMENT OR THE TRANSACTIONS
CONTEMPLATED HEREBY.

                                        9

<PAGE>   11

         SECTION 7.06.  Agent.   Each of the Company, the Standby Servicer and
the Guarantor hereby appoints Corporation Service Company, 80 State Street, 6th
Floor, Albany, N.Y., 12207, U.S.A. as their respective nonexclusive agents for
service of process in the United States in connection with this Agreement.  The
parties may use any legally available means of service of process. Each party
hereto will promptly notify the other of any change in the address of their
respective agents, provided that the parties hereto will at all times maintain
agents located within New York State for service of process in connection with
this Agreement, the identity of any successor agent to be reasonably
satisfactory to the other party hereto.

         SECTION 7.07. Counterparts. This Agreement may be executed in separate
counterparts, each of which when so executed and delivered shall be an original,
but all such counterparts shall together constitute one and the same agreement.
All signatures need not be on the same counterpart.

         SECTION 7.08. Severability. In case any provision of or obligation
under this Agreement shall be invalid, illegal or unenforceable in any
jurisdiction, the validity, legality and enforceability of the remaining
provisions or obligations, or of such provision or obligation in any other
jurisdiction, shall not in any way be affected or impaired thereby.

         SECTION 7.09. Headings. Headings and captions used in this Agreement
are included for convenience of reference only and shall not constitute a part
of this Agreement for any other purpose or be given any substantive effect.

                                       10

<PAGE>   12

         IN WITNESS WHEREOF, this Agreement has been duly executed on the date
first written above.

                                            DEBIS AIRCRAFT LEASING LIMITED,
                                            as Standby Servicer

                                            By: ____________________________
                                                Name:
                                                Title:

                                            DEBIS AIRFINANCE B.V.,
                                            as Guarantor

                                            By: ____________________________
                                                Name:
                                                Title:

                                            AERCO LIMITED

                                            By: ____________________________
                                                Name:
                                                Title:

                                       11<PAGE>   1
                                                                    EXHIBIT 10.7

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                            CASH MANAGEMENT AGREEMENT

                                      among

                         debis Aircraft Leasing Limited,
                                 as Cash Manager

                             debis AirFinance B.V.,
                                  as Guarantor

                                  AerCo Limited

                         debis Aircraft Leasing Limited,
                                   as Servicer

                             Bankers Trust Company,
                         not in its individual capacity,
                    but solely as Trustee under the Indenture
           and as Security Trustee under the Security Trust Agreement

                                       and

                    The Entities Listed on Appendix A Hereto

<PAGE>   2

                            Dated as of July 17, 2000

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<PAGE>   3

                                TABLE OF CONTENTS

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

                                                                           PAGE
                                                                           ----

                                    ARTICLE 1
                                   DEFINITIONS

SECTION 1.01.  Definitions....................................................1

                                    ARTICLE 2
                      APPOINTMENT; CASH MANAGEMENT SERVICES

SECTION 2.01.  Appointment....................................................4
SECTION 2.02.  Establishment of Accounts......................................4
SECTION 2.03.  Description of Accounts........................................5
SECTION 2.04.  Investments of Cash............................................7
SECTION 2.05.  Calculations...................................................7
SECTION 2.06.  Withdrawals and Transfers......................................7
SECTION 2.07.  Ratings and the Accounts.......................................9
SECTION 2.08.  Records........................................................9
SECTION 2.09.  Reports........................................................9
SECTION 2.10.  Additional Aircraft...........................................10
SECTION 2.11.  Professional Advice...........................................10

                                    ARTICLE 3
                STANDARD OF PERFORMANCE; LIABILITY AND INDEMNITY

SECTION 3.01.  Standard of Performance.......................................10
SECTION 3.02.  Liability and Indemnity.......................................10
SECTION 3.03.  Conflicts of Interest.........................................11

                                    ARTICLE 4
                            CASH MANAGER UNDERTAKINGS

SECTION 4.01.  Cash Manager Undertakings.....................................12

                                    ARTICLE 5
                           UNDERTAKINGS OF AERCO GROUP

<PAGE>   4

SECTION 5.01.  Cooperation...................................................15
SECTION 5.02.  Information...................................................15
SECTION 5.03.  Scope of Services.............................................15
SECTION 5.04.  Ratification..................................................16
SECTION 5.05.  Accounts and Cash Arrangements................................17
SECTION 5.06.  Further Assurances............................................17
SECTION 5.07.  Covenants of AerCo Group......................................17

                                    ARTICLE 6
                                  EFFECTIVENESS

SECTION 6.01.  Effectiveness.................................................19

                                    ARTICLE 7
                        CASH MANAGEMENT FEES AND EXPENSES

SECTION 7.01.  Cash Management Fees..........................................19
SECTION 7.02.  Expenses......................................................19

                                    ARTICLE 8
               TERM; REMOVAL OF OR TERMINATION BY THE CASH MANAGER

SECTION 8.01.  Term..........................................................20
SECTION 8.02.  Cross-termination.............................................20
SECTION 8.03.  Right to Terminate............................................20
SECTION 8.04.  Consequences of Termination...................................22
SECTION 8.05.  Survival......................................................23

                                    ARTICLE 9
                      APPOINTMENT OF SUCCESSOR CASH MANAGER

SECTION 9.01.  Appointment of Successor Cash Manager.........................23

                                   ARTICLE 10
                            ASSIGNMENT AND DELEGATION

<PAGE>   5

SECTION 10.01.  Assignment and Delegation....................................24

                                   ARTICLE 11
                                    GUARANTEE

SECTION 11.01.  Guarantee....................................................25
SECTION 11.02.  Reinstatement................................................26
SECTION 11.03.  Unconditional Nature of Guarantee............................26

                                   ARTICLE 12
                                  MISCELLANEOUS

SECTION 12.01.  Notices......................................................26
SECTION 12.02.  Governing Law................................................28
SECTION 12.03.  Jurisdiction.................................................29
SECTION 12.04.  Agent for Service of Process.................................29
SECTION 12.05.  WAIVER OF JURY TRIAL.........................................29
SECTION 12.06.  Counterparts; Third Party Beneficiaries......................29
SECTION 12.07.  Entire Agreement.............................................29
SECTION 12.08.  Table of Contents; Headings..................................30
SECTION 12.09.  Restrictions on Disclosure...................................30
SECTION 12.10.  No Partnership...............................................31

<PAGE>   6

                                                                           PAGE
                                                                           ----

Appendix A                 Subsidiaries
Appendix B                 Form of Accession Agreement
Schedule 2.02(b)           Accounts
Exhibit A                  Certificate Authorizing Direct Funds Transfer to
                           Expense Payee
Exhibit B                  Certificate Authorizing Delegation of Certain Cash
                           Management Services

                                       iv
<PAGE>   7

         CASH MANAGEMENT AGREEMENT dated as of July 17, 2000, among debis
Aircraft Leasing Limited, a limited company organized under the laws of Ireland,
as Cash Manager (the "CASH MANAGER"), debis AirFinance B.V., a limited company
incorporated under the laws of The Netherlands (the "GUARANTOR"), AerCo Limited,
a limited liability company incorporated in Jersey, Channel Islands ("AERCO"),
debis Aircraft Leasing Limited, as Servicer (the "SERVICER"), Bankers Trust
Company, a New York banking corporation ("BANKERS TRUST"), not in its individual
capacity, but solely as trustee under the Indenture (the "TRUSTEE"), and as
security trustee under the Security Trust Agreement (the "SECURITY TRUSTEE"),
and the entities listed on Appendix A hereto and any other Subsidiary of AerCo
which accedes to this Agreement pursuant to an Accession Agreement (together,
the "SUBSIDIARIES" and collectively with AerCo, "AERCO GROUP").

         For the consideration set forth herein and other good and valuable
consideration, the receipt of which is hereby acknowledged, the parties hereto
agree as follows:

                                    ARTICLE 1
                                   DEFINITIONS

         SECTION 1.01. Definitions. The following terms, as used herein, have
the following meanings. Unless otherwise defined herein, all capitalized terms
used but not defined herein have the meanings assigned to such terms in the
Indenture and the Security Trust Agreement.

         "ACCESSION AGREEMENT" means an accession agreement substantially in the
form of Appendix B hereto.

         "ADMINISTRATIVE AGENCY AGREEMENT" means the Administrative Agency
Agreement dated as of July 17, 2000, among the Administrative Agent, the
Guarantor, AerCo and the entities listed on Appendix A thereto and any other
Subsidiary of AerCO which accedes thereto, as amended from time to time.

         "ADMINISTRATIVE AGENT" means debis Aircraft Leasing Limited, a limited
company organized under the laws of Ireland, as administrative agent under the
Administrative Agency Agreement.

<PAGE>   8

         "AERCO" has the meaning assigned to such term in the preamble hereto.

         "AERCO GROUP" has the meaning assigned to such term in the preamble
hereto.

         "AFFILIATE" means a Person that directly, or indirectly through one or
more intermediaries, controls or is controlled by, or is under common control
with, the Person specified. The parties hereto acknowledge that each of AerCo
and its Subsidiaries, on the one part, and AerFi Group plc and its subsidiaries,
on the other part, are not Affiliates of each other.

         "AFTER-TAX BASIS" means on a basis such that any payment received,
deemed to have been received or receivable by any Person shall, if necessary, be
supplemented by a further payment to that Person so that the sum of the two
payments shall, after deduction of all U.S. federal, state, local and Irish or
other foreign Taxes, penalties, fines, interest, additions to Tax and other
charges resulting from the receipt (actual or constructive) or accrual of such
payments imposed by or under any U.S. federal, state, local or Irish or other
foreign law or Governmental Authority (after taking into account any current
deduction to which such Person shall be entitled with respect to the amount that
gave rise to the underlying payment) be equal to the payment received, deemed to
have been received or receivable.

         "AGREEMENT" has the meaning assigned to such term in the preamble
hereto.

         "BOARD OF DIRECTORS" means the board of directors of AerCo.

         "CASH MANAGEMENT SERVICES" has the meaning assigned to such term in
Section 2.01(a) hereof.

         "CASH MANAGER" has the meaning assigned to such term in the preamble
hereto.

         "EU" means the European Union.

         "GOVERNMENTAL AUTHORITY" means any court, administrative agency or
commission or other governmental agency or instrumentality (or any officer or
representative thereof), national, federal, state, local or international, of
competent jurisdiction including, without limitation, the EU.

         "GUARANTEED OBLIGATIONS" has the meaning assigned to such term in
Section 11.01 hereof.

<PAGE>   9

         "GUARANTOR" has the meaning assigned to such term in the preamble
hereto.

         "INDENTURE" means the Indenture dated as of July 15, 1998, between
AerCo and the Trustee, as amended or supplemented from time to time.

         "INFLATION FACTOR" has the meaning specified in the Administrative
Agency Agreement.

         "LOSSES" means any and all liabilities (including liabilities arising
out of the doctrine of strict liability), obligations, losses, damages,
penalties, Taxes, actions, suits, judgments, costs, fees, expenses (including
reasonable legal fees, expenses and related charges and costs of investigation)
and disbursements, of whatsoever kind and nature; provided, that the term
"Losses" shall not include any indemnified party's management time or overhead
expenses.

         "RELATED DOCUMENTS" has the meaning assigned to such term in the
Indenture.

         "REPRESENTATIVES" with respect to any Person means the officers,
directors, employees, advisors and agents of such Person.

         "SECURITY TRUST AGREEMENT" means the Security Trust Agreement dated as
of July 15, 1998, among AerCo, the Security Trustee and the other entities
specified therein, as amended or supplemented from time to time.

         "SECURITY TRUSTEE" has the meaning assigned to such term in the
preamble hereto.

         "SERVICER" has the meaning assigned to such term in the preamble
hereto.

         "SERVICING AGREEMENT" means the Servicing Agreement dated as of July
17, 2000, among the Servicer, the Guarantor, AerCo and the entities listed on
Appendix A thereto and any other Subsidiary of AerCo which accedes thereto, as
amended from time to time.

         "SPECIAL BOARD RESOLUTION" has the meaning given to it in the Articles
of Association of AerCo; provided that references to a Special Board Resolution
shall be construed as references to an ordinary resolution of the Board of
Directors any time at which the Servicer and/or its Affiliates do not hold a
majority of the Class E Notes.

                                       3

<PAGE>   10

         "STANDARD OF PERFORMANCE" has the meaning assigned to such term in
Section 3.01 hereof.

         "STANDBY SERVICING AGREEMENT" means the Standby Servicing,
Administrative Agency and Cash Management Agreement dated as of July 17, 2000,
among AerCo, debis Aircraft Leasing Limited, as Standby Servicer and the
Guarantor, as amended from time to time.

         "START DATE" has the meaning specified in the Standby Servicing
Agreement.

         "TRUSTEE" has the meaning assigned to such term in the preamble hereto.

                                    ARTICLE 2
                      APPOINTMENT; CASH MANAGEMENT SERVICES

         SECTION 2.01. Appointment. (a) The Security Trustee, on behalf of the
Secured Parties, having been duly authorized by AerCo, hereby appoints the Cash
Manager, with effect from the Start Date, as the provider to AerCo Group of the
cash management services set forth herein and in the Indenture (the "CASH
MANAGEMENT SERVICES") and delegates to the Cash Manager its authority to
administer the Accounts, to undertake the transactions contemplated hereby
(including the power to direct withdrawals or transfers from the Accounts in
accordance with this Agreement and the Indenture) and to otherwise perform the
Cash Management Services on behalf of AerCo Group on the terms and subject to
the conditions set forth in this Agreement.

          (b) The Cash Manager hereby accepts such appointment and agrees to
perform, with effect from the Start Date, the Cash Management Services on the
terms and subject to the conditions set forth in this Agreement; provided,
however, that it shall not be a condition to the Cash Manager's performance of
the Cash Management Services that it shall have received a Start Notice.

         SECTION 2.02.  Establishment of Accounts.  (a) Operating Bank.  The
Operating Bank shall be the Senior Trustee, initially Bankers Trust Company,
located at Four Albany Street, New York, New York 10006.

          (b) Establishment of Accounts. The Cash Manager shall establish (to
the extent not theretofore established) and maintain each of the Accounts set
forth on

                                       4

<PAGE>   11

Schedule 2.02(b) hereto, in each case in the manner described herein and in
Section 3.01 of the Indenture. Promptly following delivery or receipt by AerCo
of a termination notice under the Servicing Agreement with AerFi Group plc or
the Administrative Agency Agreement, AerFi Administrative Services Limited,
AerCo will furnish to the Cash Manager a current listing of all Accounts and on
the Start Date, AerCo and the Cash Manager will agree to an amended Schedule
2.02(b) to reflect Accounts in existence as of the Start Date. The Cash Manager
shall take all actions necessary to establish, and shall establish, additional
or replacement Accounts from time to time as required by and in accordance with
the terms of Section 3.01 of the Indenture. In addition, the Cash Manager shall
take all actions necessary to cause the Security Trustee to be granted, to the
extent possible, a security interest pursuant to Section 2.01 of the Security
Trust Agreement in the interest of each AerCo Group Member in the cash balances
from time to time deposited in the Accounts.

          (c) Successor Operating Bank. If the Operating Bank should change as a
result of (A) the resignation of the Senior Trustee or replacement of the Senior
Trustee by an Eligible Institution pursuant to the terms of the Indenture, (B)
the repayment in full of the Senior Class of Notes or (C) such Operating Bank's
failure to meet the criteria necessary to qualify as an Eligible Institution,
then the Cash Manager, acting on behalf of the Security Trustee, shall thereupon
promptly establish replacement accounts as necessary at the successor Operating
Bank and transfer the balance of funds in each Account then maintained at the
former Operating Bank to such successor Operating Bank.

         SECTION 2.03.  Description of Accounts.  (a) Collection Account.  The
Cash Manager shall establish and maintain the Collection Account in accordance
with Section 3.01(b) of the Indenture.

          (b)   The Lessee Funded Account. The Cash Manager shall establish and
maintain the Lessee Funded Account in accordance with Section 3.01(c) of the
Indenture.

          (c)   Expense Account.  The Cash Manager shall establish and maintain
the Expense Account in accordance with Section 3.01(d) of the Indenture.

          (d) Rental Accounts. The Cash Manager shall establish and maintain the
Rental Accounts, and from time to time shall establish and maintain one or more
additional Rental Accounts (including one or more Non-Trustee Accounts that, for
tax

                                       5

<PAGE>   12

or other regulatory or legal purposes, cannot be established in the name of
the Security Trustee), each in accordance with Section 3.01(e) of the Indenture.

          (e)   Refinancing Account.  The Cash Manager shall establish and
maintain a Refinancing Account with respect to each subclass of Notes in
accordance with Section 3.01(f) of the Indenture.

          (f) Defeasance/Redemption Account. The Cash Manager shall establish
and maintain the Defeasance/Redemption Account in accordance with Section
3.01(g) and Article XI of the Indenture.

          (g)   Aircraft Purchase Account.  The Cash Manager shall establish and
maintain the Aircraft Purchase Account in accordance with Section 3.01(h) of the
Indenture.

          (h)   Note Account.  The Cash Manager shall establish and maintain the
Note Account in accordance with Section 3.01(i) of the Indenture.

          (i) Lessee Payment Instructions. (i) The Cash Manager shall furnish
transfer instructions in the form set forth in Exhibit D to the Security Trust
Agreement to each bank other than the Operating Bank at which a Rental Account
is located and take all necessary steps to ensure that all funds on deposit in
each such Rental Account are transferred from such Rental Account to the
Collection Account within one Business Day of receipt thereof.

         (ii) Not later than one month after any Closing Date occurring after
         the Start Date and from time to time thereafter, the Cash Manager shall
         (A) transmit payment instructions directing each Lessee which, in
         accordance with the terms of the relevant Lease, made payments into any
         bank accounts prior to such Closing Date to make all future Rental
         Payments to a designated Rental Account at the Operating Bank, (B)
         transmit payment instructions to the bank in which such accounts are
         maintained, directing such bank to forward to a designated Rental
         Account at the Operating Bank any payments made into any such account
         after such Closing Date and (C) close any such accounts as soon as
         practicable after all AerCo Group Lessees have been given payment
         instructions pursuant to this Section 2.03(i) and the Cash Manager has
         become satisfied that all such Lessees are making and will continue to
         make payments in accordance with such payment instructions.

                                       6

<PAGE>   13

         (j)   Bank Account Statements. The Cash Manager shall take all
necessary steps to ensure that the Operating Bank and each other bank at which a
Rental Account is located shall furnish as of the close of business on each
Calculation Date a statement providing the then current balance of each
applicable Account to the Security Trustee, AerCo, the Trustee, the Servicer and
the Cash Manager.

         (k)   Maintaining the Non-Trustee Accounts.  So long as any Secured
Obligations remain Outstanding:

         (i)   The Cash Manager shall maintain, or cause to be maintained, each
         Non-Trustee Account in the name of the related Grantor (as defined in
         the Security Trust Agreement) only with a bank (an "ACCOUNT BANK") that
         has entered into a letter agreement in substantially the form of
         Exhibit D to the Security Trust Agreement (or made such other
         arrangements as are acceptable to the Cash Manager and the Security
         Trustee) with such Grantor and the Security Trustee (an "ACCOUNT
         LETTER").

         (ii)  The Cash Manager (x) shall promptly instruct each Person
         obligated at any time to make any payment to any Grantor for any reason
         (an "OBLIGOR") to make such payment to a Non-Trustee Account meeting
         the requirements of clause (i) above, (y) shall instruct each such
         Account Bank to transfer to the Collection Account, in immediately
         available funds, within one Business Day of receipt thereof, an amount
         equal to the credit balance of the Non-Trustee Account in such Account
         Bank (other than any amount required to be left on deposit in such
         Account Bank for local tax or other regulatory or legal purposes), and
         (z) shall transfer or cause each such Account Bank to transfer to the
         Security Trustee for deposit in the Collection Account, within one
         Business Day of receipt thereof, all other Cash Collateral and any
         proceeds of any of the Collateral.

         (iii) Upon the termination of any Account Letter or other arrangement
         with respect to the maintenance of a Non-Trustee Account by any Grantor
         or any Account Bank, the Cash Manager shall immediately notify all
         Obligors that were making payments to such Non-Trustee Account to make
         all future payments to another Non-Trustee Account meeting the
         requirements of clause (i) above or, if practicable at such time, to an
         Account in the name of the Security Trustee.

                                       7

<PAGE>   14

         SECTION 2.04. Investments of Cash. The Cash Manager shall invest and
reinvest the funds on deposit in the Accounts as permitted by and in accordance
with Section 3.02 of the Indenture.

         SECTION 2.05. Calculations. Pursuant to Section 3.06 of the Indenture,
the Cash Manager shall, at the times and in the manner set forth therein,
determine or calculate each of the amounts required to be determined or
calculated by it pursuant to Sections 3.06(a) through (f) of the Indenture.

         SECTION 2.06.  Withdrawals and Transfers.  The Cash Manager shall
make the following withdrawals and transfers in accordance with the terms of the
Indenture:

          (a) Closing Date Deposits, Withdrawals and Transfers. On any Closing
Date occurring after the Start Date, the Cash Manager shall or shall instruct,
in writing, the Trustee or the Security Trustee, as the case may be, to make
each of the transfers described in Section 3.03 of the Indenture.

          (b) Interim Withdrawals and Transfers for Expenses and Certain Lease
Obligations. From time to time, the Cash Manager shall or shall instruct, in
writing, the Trustee or the Security Trustee, as the case may be, to make the
withdrawals and transfers provided for in Section 3.04(a) of the Indenture in
accordance with such Section.

         For the purposes of this Section 2.06(b), neither the Trustee nor the
Security Trustee shall be liable for withdrawals or transfers made solely by the
Cash Manager without direction of either the Trustee or Security Trustee.

          (c) Interim Withdrawals and Transfers in Respect of Undelivered
Related Collateral. From time to time, the Cash Manager shall make the
withdrawals and transfers provided for in Section 3.04(b) of the Indenture in
accordance with such Section.

          (d) Interim Deposits and Withdrawals for Modification Payments or
Dispositions of Aircraft. From time to time, the Cash Manager shall or shall
instruct, in writing, the Trustee or the Security Trustee, as the case may be,
to make the withdrawals and transfers provided for in Section 3.05 of the
Indenture in accordance with such Section.

                                       8

<PAGE>   15

          (e) Interim Deposits and Withdrawals for Aircraft Purchases. From time
to time, the Cash Manager shall or shall instruct, in writing, the Trustee or
the Security Trustee, as the case may be, to make the deposits, withdrawals and
transfers provided for in Section 3.05 of the Indenture in accordance with such
Section.

          (f) Payment Date First Step Withdrawals and Transfers. On each Payment
Date, the Cash Manager shall or shall instruct, in writing, the Trustee or the
Security Trustee, as the case may be, to make the withdrawals and transfers
provided for in Section 3.07 of the Indenture in accordance with such Section.

          (g) Payment Date Second Step Withdrawals. Subject to Section 2.06(h)
hereof, on each Payment Date, after the withdrawals and transfers provided for
in Section 2.06(f) hereof have been made, the Cash Manager shall or shall
instruct, in writing, the Trustee or the Security Trustee, as the case may be,
to distribute funds on deposit in the Collection Account and the Expense Account
as provided in Section 3.08 of the Indenture; provided, that any such direct
funds transfer shall have been authorized on or prior to the date thereof by the
Cash Manager in the form of a certificate, substantially in the form of Exhibit
A hereto, delivered to and acknowledged by the Trustee.

          (h) Event of Default and Default Notice Withdrawals and Transfers.
Notwithstanding anything to the contrary contained in Section 2.06(f) or 2.06(g)
hereof, following the delivery of a Default Notice to the Cash Manager or AerCo
pursuant to the Indenture or during the continuation of an Acceleration Default,
after the withdrawals and transfers provided for in Section 2.06(f) hereof have
been made, the Cash Manager shall distribute funds on deposit in the Collection
Account and the Expense Account in the amounts and in the order of priority
provided for in Section 3.08(b) of the Indenture.

          (i) Defeasance/Redemption Transfers. The Cash Manager shall or shall
direct, in writing, the Trustee or the Security Trustee, as the case may be, to
transfer from time to time amounts on deposit in the Defeasance/Redemption
Account to the applicable Note Account in connection with either the redemption
of any subclass of Notes in accordance with Section 3.10 of the Indenture or the
exercise of the defeasance provisions set forth in Article XI of the Indenture.

          (j) Tax Defeasance Account Transfers. The Cash Manager shall or shall
direct, in writing, the Trustee or the Security Trustee, as the case may be, to
transfer

                                       9

<PAGE>   16

from time to time amounts on deposit in the Defeasance/Redemption Account to the
Note Account or to the relevant Investors in connection with any tax defeasance
transactions in accordance with Section 3.10(b) of the Indenture.

          (k) Refinancing Transfers. The Cash Manager shall or shall direct, in
writing, the Trustee or the Security Trustee, as the case may be, to transfer
from time to time amounts on deposit in the Refinancing Account to the Note
Accounts in connection with any Refinancing in accordance with Section 2.10 of
the Indenture.

          (l) Currency Conversions. If and to the extent that any AerCo Group
member incurs any payment obligation or other cost in a currency other than U.S.
dollars, the Cash Manager shall, to the extent practicable, convert U.S. dollars
into such other currency at the then prevailing market rate as necessary to
discharge such payment obligations or costs, at the expense of AerCo in
accordance with Section 13.07 of the Indenture.

         SECTION 2.07. Ratings and the Accounts. Each Account shall at all times
be maintained at the Operating Bank or another Eligible Institution selected by
the Cash Manager in accordance with the Security Trust Agreement and the
Indenture; provided that one or more Rental Accounts may be maintained at any
other reputable and responsible bank in accordance with Section 3.01 of the
Indenture.

         SECTION 2.08. Records. The Cash Manager shall provide such information
relating to the Accounts and the Permitted Account Investments to the Security
Trustee, the Trustee or the Rating Agencies as any of them may reasonably
request from time to time.

         SECTION 2.09.  Reports.  The Cash Manager shall provide the reports and
other information required to be provided by it pursuant to Section 3.06(f) of
the Indenture, together with copies of such additional reports or other
information as the Security Trustee or the Trustee may reasonably request, all
in accordance with the terms of the Indenture.

         SECTION 2.10. Additional Aircraft. In the event that AerCo Group shall
acquire any Additional Aircraft (as defined in the Servicing Agreement) and
notwithstanding that AerCo Group may retain different Service Providers for such
Additional Aircraft, the Cash Manager hereby agrees to provide the same Cash
Management Services with respect to all such Additional Aircraft.

                                       10

<PAGE>   17

         SECTION 2.11. Professional Advice. The Cash Manager may, on behalf of
AerCo Group, retain and instruct legal counsel and accounting, tax and other
professional advisers to represent and advise AerCo Group when the Cash Manager
considers in good faith that it is appropriate or necessary for such advisers to
be appointed to protect the interests and rights of any AerCo Group Member or
for the Cash Manager to comply with its obligations under this Agreement;
provided, however, that, in any one-month period, the Cash Manager shall not be
permitted contractually to obligate AerCo Group to pay fees to such advisers
pursuant to this Section 2.11 or any other section of this Agreement relating to
the engagement of advisers in an aggregate amount in excess of $100,000 without
the prior written consent of the Board of Directors of AerCo.

                                    ARTICLE 3
                STANDARD OF PERFORMANCE; LIABILITY AND INDEMNITY

         SECTION 3.01. Standard of Performance. The Cash Manager will devote the
same amount of time and attention to, and shall be required to exercise the same
level of skill, care and diligence in the performance of the Cash Management
Services as a prudent businessperson would in administering such services on its
own behalf (the "STANDARD OF PERFORMANCE").

         SECTION 3.02. Liability and Indemnity. (a) The Cash Manager shall not
be liable for any Losses or Taxes to or of, or payable by, any AerCo Group
Member at any time including Losses resulting from the investment in any
Permitted Account Investment or any investment losses resulting from such
investment, unless such Losses or Taxes shall arise in connection with the Cash
Manager's own gross negligence (or simple negligence in the handling of funds),
willful misconduct, deceit or fraud or that of any of its directors, trustees,
officers, agents, permitted delegates or employees, as the case may be.

          (b) Subject to and in accordance with the provisions of the Indenture,
AerCo and the other AerCo Group Members do hereby agree to indemnify and hold
harmless the Cash Manager, its respective directors, officers, agents and
employees and each of them against any Losses or Taxes whatsoever which they or
any of them may incur or be subject to as a consequence of this Agreement or as
a result of the performance of the functions and services hereunder (including
any Losses or Taxes incurred by the

                                       11

<PAGE>   18

Cash Manager as a result of its indemnifying any permitted delegate of any of
its functions hereunder) except as a result of the negligence, willful default,
deceit or fraud of the Cash Manager or any of its directors, officers, agents or
employees, as the case may be. This indemnity shall expressly inure to the
benefit of any existing or future director, officer, agent or employee of the
Cash Manager and to the benefit of any successor of the Cash Manager and shall
survive the termination or expiration of this Agreement.

          (c) Each of the Cash Manager, the Security Trustee, the Trustee and
AerCo acknowledges and agrees that the terms of this Agreement contemplate that
the Cash Manager shall receive the Relevant Information in order for the Cash
Manager to make required credit and debit entries and to make the calculations
and supply the information and reports required herein, and that the Cash
Manager will do the foregoing to the extent such information is so provided by
such relevant parties and on the basis of such information, without undertaking
any independent verification or recalculation of such information.

          (d) The Cash Manager agrees to indemnify, reimburse and hold harmless
(on an after-tax basis) each AerCo Group Member, the Trustee and the Security
Trustee and their respective directors, trustees and agents for any Losses
whatsoever which they or any of them may incur or be subject to in consequence
of the performance of the Cash Management Services or any breach of the terms of
this Agreement by the Cash Manager, but only to the extent such Losses arise due
to the gross negligence (or simple negligence in the handling of funds), wilful
misconduct, deceit or fraud of the Cash Manager or any of its directors,
trustees, officers, agents, permitted delegates or employees, as the case may
be.

         SECTION 3.03. Conflicts of Interest. (i) Each of AerCo and its
Subsidiaries acknowledges and agrees that (a) in addition to providing the Cash
Management Services under this Agreement, debis Aircraft Leasing Limited may
provide similar services for other third parties, (b) in the course of
conducting such activities, the Cash Manager may from time to time have
conflicts of interest in performing its duties on behalf of the Security Trustee
and the Trustee and the various entities in respect of which it provides such
similar services, (c) debis Aircraft Leasing Limited, is acting as
Administrative Agent and as Servicer and (d) the Directors of AerCo have
approved the transactions contemplated by this Agreement and desire that such
transactions be consummated and, in giving such approval, the Board of Directors
of AerCo has expressly recognized that such conflicts of interest may arise from
time to time and

                                       12

<PAGE>   19

that, when such conflicts of interest arise, the Cash Manager shall promptly
report the same to the Security Trustee, AerCo and the Trustee and shall act in
a manner that (i) treats each AerCo Group Member equally with such other
entities, (ii) does not violate the Standard of Performance and (iii) would not
be reasonably likely to have a material adverse effect on the Noteholders.

         (ii) The Directors of AerCo, by a Special Board Resolution, shall be
         entitled to seek independent advice and to appoint an independent
         representative in connection with the provision of the Cash Management
         Services by the Cash Manager hereunder, including in connection with
         any conflict of interest or any potential conflict of interest.

                                    ARTICLE 4
                            CASH MANAGER UNDERTAKINGS

         SECTION 4.01. Cash Manager Undertakings. The Cash Manager hereby
covenants with the Security Trustee and the Trustee that it will conduct its
business such that it is a separate and readily identifiable business from, and
independent of, that of each AerCo Group Member (it being understood that any
AerCo Group Member may publish financial statements that are consolidated with
those of the Guarantor and any of its Affiliates, if to do so is required by any
applicable law or accounting principles from time to time in effect) and further
covenants as follows:

          (a) if the Cash Manager receives (including in its capacity as agent
for the Security Trustee after the delivery of a Default Notice) any funds
whatsoever under this Agreement or any Related Document, which funds belong to
the Security Trustee, AerCo or the Trustee, or are to be paid to the Security
Trustee, AerCo or the Trustee or into any Account pursuant to this Agreement,
any Related Document or otherwise, then the Cash Manager shall (i) hold such
funds in trust for the Security Trustee, AerCo, or the Trustee, as the case may
be, (ii) keep such funds separate from all other funds belonging to the Cash
Manager and (iii) as soon as possible following receipt thereof, pay the same
into the appropriate Account in accordance with the terms hereof;

                                       13

<PAGE>   20

          (b) the Cash Manager shall comply with all lawful directions, orders
and instructions which the Security Trustee may from time to time give to it in
writing which are in accordance with the provisions of this Agreement and the
Indenture;

          (c) the Cash Manager shall not knowingly fail to comply with any legal
requirements in the performance of the Cash Management Services;

          (d) the Cash Manager shall make all payments required to be made by it
at any time and from time to time pursuant to this Agreement on the required
date for payment thereof and shall turn over any amounts owed to the Security
Trustee, AerCo or the Trustee without set-off or counterclaim;

          (e) the Cash Manager shall cooperate with the Security Trustee and the
Trustee and their respective agents, directors or trustees (including by
providing such information as may reasonably be requested at any time and from
time to time) to permit the Security Trustee and the Trustee or their respective
authorized agents to monitor the Cash Manager's compliance with its obligations
under this Agreement;

          (f) the Cash Manager is acting hereunder as the agent of the Security
Trustee and the Trustee and, except in relation to any money erroneously
received by the Cash Manager by way of deposit into any of the Cash Manager's
bank accounts (which shall be held in trust by the Cash Manager on behalf of the
Security Trustee and deposited into the appropriate Account as soon as
reasonably practicable), neither the Cash Manager nor any of its Affiliates
shall be under any fiduciary duty or other implied obligation or duty to any
AerCo Group Member or any holder of any equity or debt security issued by any
AerCo Group Member, any Lessee or any other Person arising out of this
Agreement;

          (g) the Cash Manager shall not take any steps for the purpose of
procuring the appointment of any administrative receiver or the making of any
administrative order or for instituting any bankruptcy, reorganization,
arrangement, insolvency, winding up, liquidation, composition or any like
proceedings under the laws of any jurisdiction in respect of any AerCo Group
Member or in respect of any of their respective liabilities, including, without
limitation, as a result of any claim or interest of the Cash Manager or any of
its Affiliates;

          (h) the Cash Manager shall cooperate with the Security Trustee, AerCo
Group and their respective agents, trustees and directors, including any
providing such

                                       14

<PAGE>   21

information as may reasonably be requested, to permit AerCo Group or its
authorized agents to monitor the Cash Manager's compliance with its obligations
under this Agreement;

          (i) during the term of this Agreement, the Cash Manager shall observe
all corporate formalities necessary to remain a legal entity separate and
distinct from each AerCo Group Member;

          (j) during the term of this Agreement, the Cash Manager shall maintain
its assets and liabilities separate and distinct from each AerCo Group Member;

          (k) during the term of this Agreement, the Cash Manager shall maintain
records, books, accounts and minutes separate from those of each AerCo Group
Member;

          (l) during the term of this Agreement, the Cash Manager shall pay its
obligations in the ordinary course of its business as a legal entity separate
from each AerCo Group Member;

          (m) during the term of this Agreement, the Cash Manager shall keep its
funds separate and distinct from the funds of each AerCo Group Member, and it
will receive, deposit, withdraw and disburse such funds separately from the
funds of each AerCo Group Member;

          (n) during the term of this Agreement, the Cash Manager shall conduct
its business in its own name and not in the name of any AerCo Group Member;

          (o) during the term of this Agreement, the Cash Manager shall not pay
or become liable for any debt of any AerCo Group Member, other than to make
payments in the form of indemnity as required by the express terms of this
Agreement;

          (p) during the term of this Agreement, the Cash Manager shall not hold
out that it is a division of any AerCo Group Member, or that any AerCo Group
Member is a division of it;

          (q) during the term of this Agreement, the Cash Manager shall not
induce any third party to rely on the creditworthiness of any AerCo Group Member
in order that such third party will be induced to contract with it;

                                       15

<PAGE>   22

          (r) during the term of this Agreement, the Cash Manager shall not
enter into any agreements between it and any AerCo Group Member that are more
favorable to either party than agreements that the parties would have been able
to enter into at such time on an arm's-length basis with a non-affiliated third
party, other than any agreements in effect on the date hereof (it being
understood that the parties hereto do not intend by this covenant to ratify any
self-dealing transactions); and

          (s) during the term of this Agreement, it shall observe all corporate
or other procedures required under applicable law and each of their constitutive
documents.

                                    ARTICLE 5
                           UNDERTAKINGS OF AERCO GROUP

         SECTION 5.01. Cooperation. The Trustee shall use its best efforts and
AerCo shall, and shall cause each AerCo Subsidiary, and, to the extent within
its power each other Service Provider, to cooperate at all times with the Cash
Manager to enable the Cash Manager to provide the Cash Management Services,
including providing the Cash Manager with all powers of attorney and such
information as may be reasonably necessary or appropriate for the Cash Manager
to perform the Cash Management Services.

         SECTION 5.02.  Information.  AerCo will provide the Cash Manager with
the following information in respect of itself and each other AerCo Group
Member:

          (a)   a list of all legal advisers;

          (b) copies of all Related Documents, including the Memorandum and
Articles of Association of AerCo, and copies of all statutory books and records
maintained on behalf thereof by such Persons;

          (c) details of all bank accounts and bank mandates maintained by the
Cash Manager on behalf of the Security Trustee, the Trustee and each AerCo Group
Member;

                                       16

<PAGE>   23

          (d) names of and contact information with respect to the board of
directors of each AerCo Group Member and the secretary and registered office of
each AerCo Group Member; and

          (e) such other information as is necessary to the Cash Manager's
performance of the Cash Management Services.

         The information referred to in this Section 5.02 (with the exception of
paragraph (e)) shall be provided to the Cash Manager upon execution of this
Agreement and, with respect to the information noted in paragraph (e), upon
request and, in respect of any amendment or changes to the information provided
to the Cash Manager upon execution of this Agreement, promptly following the
effectiveness of such amendments or changes.

         SECTION 5.03. Scope of Services. (a) Subject to subsection (b) below,
in the event that any AerCo Group Member enters into any agreement, amendment or
other modification of any Related Document or shall take any other action that
has the effect of increasing in any material respect the scope, nature or level
of the Cash Management Services, the Trustee shall provide written notice
thereof to the Cash Manager (provided the Trustee has actual knowledge of same),
and the Cash Manager shall not be obligated to perform such affected Cash
Management Services to the extent of such increase unless and until the Cash
Manager, the Security Trustee and the Trustee shall agree on the terms on which
such increased Cash Management Services shall be provided. In each such case,
the Cash Manager shall not be obligated or permitted to take any action that
might reasonably be expected to result in the business of AerCo Group ceasing to
be separate and readily identifiable from, and independent of, that of the Cash
Manager and its Affiliates. The Security Trustee and the Trustee shall, as
directed in writing by AerCo, engage another Person to perform the affected or
increased Cash Management Services without the prior written consent of the Cash
Manager if they determine, in their discretion, that timely agreement with the
Cash Manager for the performance of such services cannot be reached on
commercially reasonable terms.

          (b) In the event that AerCo Group shall acquire Additional Aircraft,
AerCo Group shall so notify the Cash Manager and the Cash Manager shall be
obligated to provide the Cash Management Services with respect to such
Additional Aircraft in accordance with Section 2.10 hereof.

                                       17

<PAGE>   24

         SECTION 5.04. Ratification. (a) AerCo and the other AerCo Group Members
hereby ratify and confirm, and agree to ratify and confirm (and shall furnish
written evidence thereof upon request of the Cash Manager), any act or omission
by the Cash Manager in accordance with this Agreement in the exercise of any of
the powers or authorities conferred upon the Cash Manager under the terms of
this Agreement, it being expressly understood and agreed that none of the
foregoing shall have any obligation to ratify and confirm, and expressly does
not ratify and confirm, any act or omission of the Cash Manager in violation of
this Agreement, the Standard of Performance or for which the Cash Manager is
obligated to indemnify any AerCo Group Member or any Subsidiary under Article 3
hereof.

          (b) AerCo hereby undertakes to cause, if so requested by the Cash
Manager, any subsidiary of AerCo formed or acquired after the date hereof to
execute an agreement with the Cash Manager adopting and confirming, as regards
such subsidiary, the terms of this Agreement and agreeing to ratify whatever the
Cash Manager does in accordance with this Agreement in the exercise of any
powers or authorities conferred upon the Cash Manager under the terms of this
Agreement, it being expressly understood and agreed that no AerCo Group Member
shall have any obligation to ratify and confirm, and expressly does not ratify
and confirm, any act or omission of the Cash Manager in violation of the
Standard of Performance or for which the Cash Manager is obligated to indemnify
any AerCo Group Member under Article 3 hereof.

         SECTION 5.05. Accounts and Cash Arrangements. (a) No new bank or other
account shall be established other than in accordance with this Agreement, the
Security Trust Agreement and the Indenture. The Security Trustee shall not
authorize the Trustee, AerCo, any other AerCo Group Member or any other Person
other than the Cash Manager and its authorized agents to make disbursements from
any such accounts on their behalf or on behalf of the Trustee, AerCo, or any
AerCo Group Member.

          (b) Except as provided in Section 2.07 hereof, neither the Cash
Manager nor any AerCo Group Member shall modify any arrangement with respect to
the flow of cash in connection with payments, remittances and investment of
funds or the creation, maintenance or termination of any Account (other than in
accordance with this Agreement and the Indenture) without the written consent of
the Security Trustee, the Trustee and AerCo.

                                       18

<PAGE>   25

         SECTION 5.06. Further Assurances. Each of the Cash Manager and AerCo
agrees that, at any time and from time to time, upon the written request of the
Security Trustee or the Trustee, it shall execute and deliver such further
documents and do such further acts and things and, solely with respect to AerCo,
shall cause each AerCo Subsidiary to execute and deliver such further documents
and do such further acts and things, in each case as the Security Trustee or the
Trustee may reasonably request in order to effect the purposes of this
Agreement.

         SECTION 5.07. Covenants of AerCo Group. Each AerCo Group Member
covenants with the Cash Manager that it shall conduct its business in every way
possible such that it is a separate and readily identifiable business from that
of the Cash Manager and its Affiliates (it being understood that any AerCo Group
Member may publish financial statements that are consolidated with those of the
Guarantor and any of its Affiliates, if to do so is required by any applicable
law or accounting principles from time to time in effect) and, to the extent
possible, shall cause each of its Subsidiaries to do the same, and further
covenants as follows:

          (a) during the term of this Agreement, it will observe, and shall
cause each AerCo Subsidiary to observe, all corporate formalities necessary to
remain legal entities separate and distinct from the Cash Manager;

          (b) during the term of this Agreement, it will maintain, and shall
cause each AerCo Subsidiary to maintain, its assets and liabilities separate
from those of the Cash Manager;

          (c) during the term of this Agreement, it will maintain, and shall
cause each AerCo Subsidiary to maintain, records, books, accounts, and minutes
separate from those of the Cash Manager;

          (d) during the term of this Agreement, it shall pay, and shall cause
each AerCo Subsidiary to pay, its obligations in the ordinary course of business
as a legal entity separate from the Cash Manager;

          (e) during the term of this Agreement, it shall keep, and shall cause
each AerCo Subsidiary to keep, its funds separate and distinct from any funds of
the Cash Manager, and shall receive, deposit, withdraw and disburse such funds
separately from any funds of the Cash Manager;

                                       19

<PAGE>   26

          (f) during the term of this Agreement, it shall conduct, and shall
cause each AerCo Subsidiary to conduct, its business in its own name, and not in
the name of the Cash Manager;

          (g) during the term of this Agreement, it shall conduct, and shall
cause each AerCo Subsidiary not to agree, to pay or become liable for any debt
of the Cash Manager, other than to make payments in the form of indemnity as
required by the express terms of this Agreement;

          (h) during the term of this Agreement, it shall not hold out, and
shall cause each AerCo Subsidiary not to hold out, that it or any of them is a
division of the Cash Manager, or that the Cash Manager is a division of any of
them;

          (i) during the term of this Agreement, it shall not induce, and shall
cause each AerCo Subsidiary not to induce, any third party to rely on the
creditworthiness of the Cash Manager in order that such third party will be
induced to contract with it;

          (j) during the term of this Agreement, it shall not enter into, and
shall cause each AerCo Subsidiary not to enter into, any transaction between any
of them and the Cash Manager that is more favorable to either party than
transactions that the parties would have been able to enter into at such time on
an arm's-length basis with a non-affiliated third party; other than any
agreements in effect on the date hereof (it being understood that the parties
hereto do not intend by this covenant to ratify any self-dealing transactions);
and

          (k) during the term of this Agreement, it shall observe, and shall
cause each other AerCo Group Member to observe, all material corporate
procedures and other procedures required under applicable law and each of their
constitutive documents.

                                    ARTICLE 6
                                  EFFECTIVENESS

         SECTION 6.01.  Effectiveness.  The effectiveness of this Agreement and
all obligations of the parties hereunder with respect to each Aircraft Asset
shall be conditional upon:

                                       20

<PAGE>   27

         (i)   the occurrence of the Start Date and the Delivery Date of
         such Aircraft Asset,

         (ii)  with respect to AerCo, the Cash Manager, the Guarantor, the
         Servicer, the Security Trustee, the Trustee and the entities listed on
         Appendix A to this Agreement, the execution hereof by those parties;
         and

         (iii) with respect to any entity which executes and delivers an
         Accession Agreement, the execution thereof in acknowledgment and
         agreement by AerCo, the Servicer, the Cash Manager, the Guarantor, the
         Security Trustee and the Trustee. The original parties hereto and each
         entity which becomes a party hereto by executing and delivering such an
         Accession Agreement agree that such Accession Agreement shall be
         effective without the need for each other party hereto to execute such
         Accession Agreement in acknowledgment and agreement.

                                    ARTICLE 7
                        CASH MANAGEMENT FEES AND EXPENSES

         SECTION 7.01. Cash Management Fees. (a) In consideration of the Cash
Manager's performance of the Cash Management Services, AerCo shall pay to the
Cash Manager an annual fee (the "CASH MANAGEMENT FEE") equal to $250,000 (as
such amount may be adjusted for each annual period by reference to the Inflation
Factor at the commencement of such annual period on each March 31), payable
monthly in arrears in equal installments on the Payment Date immediately
following the Start Date.

         SECTION 7.02. Expenses. The Cash Manager shall be responsible for all
costs and expenses relating to or associated with the Cash Manager's performance
of its duties as set forth in this Agreement, other than such costs as are
expressly stated herein to be an expense or cost of AerCo Group or costs
incurred as a result of the breakage of investments.

                                    ARTICLE 8

                                       21

<PAGE>   28

               TERM; REMOVAL OF OR TERMINATION BY THE CASH MANAGER

         SECTION 8.01. Term. This Agreement shall have a term commencing on the
Start Date and expiring on the date of payment in full of all amounts
outstanding to be paid on the Notes (including the Class D and the Class E
Notes) and any other securities issued by AerCo as relating to Additional
Aircraft owned by AerCo Group. During such term, this Agreement shall not be
terminable by either party except as expressly provided in this Article 8.

         SECTION 8.02.  Cross-termination.  This Agreement shall terminate in
the event of a termination of either the Servicing Agreement or the
Administrative Agency Agreement.

         SECTION 8.03. Right to Terminate. (a) At any time during the term of
this Agreement, the Security Trustee, on behalf and at the written direction of
the Secured Parties, or AerCo by a Special Board Resolution shall be entitled to
terminate this Agreement on 120 days' written notice if:

         (i)   the Cash Manager shall materially breach its obligations under
         this Agreement and, after written notice from AerCo, the Cash Manager
         has failed to cure such breach within 30 days; or

         (ii)  an involuntary proceeding shall be commenced or an involuntary
         petition shall be filed in a court of competent jurisdiction seeking
         relief in respect of the Cash Manager, or of a substantial part of the
         property or assets of the Cash Manager, under Title 11 of the United
         States Code, as now constituted or hereafter amended, or any other U.S.
         Federal or state or foreign bankruptcy, insolvency, receivership or
         similar law, and such proceeding or petition shall continue undismissed
         for 75 days or an order or decree approving or ordering any of the
         foregoing shall be entered or the Cash Manager shall go into
         liquidation, suffer a receiver or mortgagee to take possession of all
         or substantially all of its assets or have an examiner appointed over
         it or if a petition or proceeding is presented for any of the foregoing
         and not discharged within 75 days; or

         (iii) the Cash Manager shall (A) voluntarily commence any proceeding or
         file any petition seeking relief under Title 11 of the United States
         Code, as now constituted or hereafter amended, or any other U.S.
         Federal or state or foreign bankruptcy, insolvency, receivership or
         similar law,

                                       22

<PAGE>   29

         (B)   consent to the institution of, or fail to contest the filing of,
         any petition described in clause (ii) above, (C) file an answer
         admitting the material allegations of a petition filed against it in
         any such proceeding, or (D) make a general assignment for the benefit
         of its creditors.

         (b)   Following the delivery of a Default Notice or during the
continuance of an Acceleration Default, the Security Trustee, on behalf of the
Secured Parties, shall be entitled to terminate on 5 days' written notice the
authority granted to the Cash Manager to perform the Cash Management Services
set forth in Section 2.01 hereof and in the Indenture.

         (c)   At any time during the term of this Agreement, the Cash Manager
shall be entitled to terminate this Agreement on 60 days' written notice if:

         (i)   any AerCo Group Member shall fail to pay in full when due (A) any
         installment of the Cash Management Fee within 30 days after the
         effectiveness of written notice from the Cash Manager of such failure
         or (B) any other amount payable to the Cash Manager hereunder within 60
         days after written notice from the Cash Manager of such failure;

         (ii)  any AerCo Group Member shall fail to perform or observe or shall
         violate in any material respect any material term, covenant, condition
         or agreement to be performed or observed by it in respect of this
         Agreement for 30 days after AerCo Group shall have received notice of
         such failure (other than with respect to payment obligations referred
         to in clause (c)(i) of this Section 8.03);

         (iii) an involuntary proceeding shall be commenced or an involuntary
         petition shall be filed in a court of competent jurisdiction seeking
         relief in respect of AerCo or any other AerCo Group Member, or of a
         substantial part of the property or assets of AerCo or any other AerCo
         Group Member, under Title 11 of the United States Code, as now
         constituted or hereafter amended, or any other U.S. federal or state or
         foreign bankruptcy, insolvency, receivership or similar law, and such
         proceeding or petition shall continue undismissed for 60 days or an
         order or decree approving or ordering any of the foregoing shall be
         entered or AerCo or any other AerCo Group Member shall go into
         liquidation, suffer a receiver or mortgagee to take possession of all
         or substantially all of its assets or have an examiner appointed over
         it or if a

                                       23

<PAGE>   30

         petition or proceeding is presented for any of the foregoing and not
         discharged within 60 days; or

         (iv) AerCo or any other AerCo Group Member shall (A) voluntarily
         commence any proceeding or file any petition seeking relief under any
         U.S. federal or state or foreign bankruptcy, insolvency, receivership
         or similar law, (B) consent to the institution of, or fail to contest
         the filing of, any petition described in clause (b)(iii) above, (C)
         file an answer admitting the material allegations of a petition filed
         against it in any such proceeding or (D) make a general assignment for
         the benefit of its creditors.

          (d) Notwithstanding anything to the contrary in this Article 8, no
termination of this Agreement pursuant to Section 8.02 hereof, no termination of
this Agreement by the Security Trustee or AerCo pursuant to Section 8.03(a)
hereof and no termination of this Agreement by the Cash Manager pursuant to
Section 8.03(c) hereof shall become effective prior to the date of appointment
by AerCo Group of a successor cash manager and the acceptance of such
appointment by such successor cash manager; provided, however, that in the event
that a successor cash manager shall not have been appointed within 90 days after
the date upon which this Agreement would otherwise have terminated, the Cash
Manager may petition any court of competent jurisdiction for the appointment of
a successor cash manager ; provided that the Security Trustee will notify, as
soon as practicable, each rating agency then rating the Notes of the Person
which the Security Trustee, acting at the written direction of the Secured
Parties, proposes to appoint as successor cash manager and, if any such rating
agency notifies the Security Trustee in writing within 15 days of receipt of
such notice that it will decrease the rating of any of the Notes as a result of
the appointment of such Person as successor cash manager, the Security Trustee
will not proceed with the appointment of such Person. Upon action by either
party pursuant to the provisions of this Section 8.03(d), the Cash Manager shall
be entitled to the payment of any compensation owed to it hereunder in
connection with all services rendered by it hereunder, as provided in Article 7
hereof, and for so long as the Cash Manager is continuing to perform any of the
Cash Management Services for any AerCo Group Member, the Cash Manager shall be
entitled to continue to be paid all amounts due to it hereunder, net of any
amounts that shall have been finally adjudicated by a court of competent
jurisdiction to be owed by the Cash Manager to AerCo Group or not to be due to
the Cash Manager, until a successor cash manager shall have been appointed and
shall have accepted such appointment in accordance with the provisions of
Section 8.04(c) hereof.

                                       24

<PAGE>   31

          (e) Subject to Section 9.01 hereof, the parties hereto agree not to
amend this Agreement to reduce the scope of the Cash Management Services to be
provided by the Cash Manager hereunder unless a third party reasonably
acceptable to the parties hereto and to the Servicer becomes a party to this
Agreement and agrees to provide such Cash Management Services in the place of
the Cash Manager.

         SECTION 8.04. Consequences of Termination. (a) Notices. (i) Following
the termination of this Agreement pursuant to Section 8.02 hereof or by the
Security Trustee, AerCo or the Cash Manager pursuant to Section 8.03 hereof and
the replacement of the Cash Manager by a successor cash manager under Section
9.01 hereof, the former Cash Manager will promptly forward to the successor cash
manager, the Security Trustee, AerCo, the Trustee and, where applicable, any
AerCo Group Member, any notices and accounting reports (or copies thereof)
received by it during the year immediately after such termination or
resignation.

         (ii) AerCo Group will promptly notify any relevant third party,
         including the Rating Agencies, the Servicer, the Administrative Agent
         and the Trustee of the removal of or resignation by the Cash Manager
         under this Agreement and will request that all such notices and
         accounting reports and communications to the Cash Manager thereafter be
         made or given directly to the successor cash manager and AerCo Group.

          (b) Accrued Rights. A termination of this Agreement by the Security
Trustee or the resignation by the Cash Manager hereunder shall not affect the
respective rights and liabilities of any party hereto accrued prior to such
removal or resignation in respect of any prior breaches hereof or otherwise.
Upon action by any party hereto pursuant to the provisions of Section 8.03
hereof, the Cash Manager shall be entitled to the payment of any compensation
owed to it by AerCo Group hereunder.

          (c) Replacement. If this Agreement is terminated pursuant to Section
8.02 hereof or by the Security Trustee or AerCo or by the Cash Manager pursuant
to Section 8.03 hereof and the Cash Manager is replaced by a successor cash
manager under Section 9.01 hereof, such former Cash Manager will cooperate with
such successor cash manager, including providing such successor cash manager
with all information and documents reasonably requested.

         SECTION 8.05. Survival. Notwithstanding any termination or the
expiration of this Agreement, the respective obligations of AerCo Group and the
Cash Manager

                                       25

<PAGE>   32

under Sections 3.02, 7.01 (to the extent any fees due and owing through such
date of termination remain unpaid) and 8.04 hereof shall survive such
termination or expiration, as the case may be.

                                    ARTICLE 9
                      APPOINTMENT OF SUCCESSOR CASH MANAGER

         SECTION 9.01. Appointment of Successor Cash Manager. In the event of
the removal or resignation of the Cash Manager pursuant to Section 8.02 or 8.03
hereof, the Security Trustee, on behalf of, and at the written direction of, the
Secured Parties, may appoint a successor cash manager or any other Person as
successor cash manager ; provided that the Security Trustee will notify, as soon
as practicable, each rating agency then rating the Notes of the Person which the
Security Trustee, acting at the written direction of the Secured Parties,
proposes to appoint as successor cash manager and, if any such rating agency
notifies the Security Trustee in writing within 15 days of receipt of such
notice that it will decrease the rating of any of the Notes as a result of the
appointment of such Person as successor cash manager, the Security Trustee will
not proceed with the appointment of such Person. Any successor cash manager so
appointed following the removal or resignation of the Cash Manager pursuant to
the provisions of Section 8.02 or 8.03 hereof shall execute and deliver to the
former Cash Manager, the Security Trustee, AerCo Group and the Trustee an
instrument accepting such appointment. Thereupon, such successor cash manager
shall, without any further act, deed or conveyance, become vested with all the
authority, rights, powers, immunities, duties and obligations of the Cash
Manager, and with like effect as if originally named as Cash Manager under this
Agreement, and the former Cash Manager shall thereupon be obligated to transfer
and deliver such relevant records or copies thereof maintained by the Cash
Manager in connection with the performance of its obligations under this
Agreement and each of the other Related Documents.

                                   ARTICLE 10
                            ASSIGNMENT AND DELEGATION

                                       26

<PAGE>   33

         SECTION 10.01. Assignment and Delegation. (a) The Cash Manager may
delegate the performance of any of the Cash Management Services (provided that
any such delegation shall not release the Cash Manager from its obligations
hereunder), such delegation to be procured by delivery to the Trustee of a
Certificate in the form of Exhibit B hereto.

          (b) Except as set forth in this Section 10.01, none of the parties to
this Agreement shall assign or delegate this Agreement or all or any part of its
rights or obligations hereunder to any other person without the prior written
consent of the other parties thereto.

          (c) Without limiting the foregoing, any Person who shall become a
successor by assignment or otherwise of the Cash Manager (or any respective
successors thereof) in accordance with this Section 10.01 shall be required, as
a condition to the effectiveness of any such assignment or other arrangements,
to become a party to this Agreement.

                                   ARTICLE 11
                                    GUARANTEE

         SECTION 11.01. Guarantee. The Guarantor hereby fully and
unconditionally guarantees to AerCo Group and the Servicer (i) the due and
punctual performance by the Cash Manager of all agreements, covenants and other
obligations required to be performed by the Cash Manager hereunder or under any
other Related Document (including, without limitation, the punctual payment when
due of all amounts now or hereafter payable by the Cash Manager hereunder or
under any other Related Document) (all such agreements, covenants and other
obligations being the "GUARANTEED OBLIGATIONS"), all in accordance with the
terms of this Agreement and the other Related Documents, and agrees to pay any
and all expenses (including counsel fees and expenses) incurred by any of the
parties hereto or any of their respective officers, directors or agents in
enforcing any right under this Section 11.01 (except costs of AerCo in an
enforcement action in which the remedies sought by AerCo are denied by a final
court order). The liability of the Guarantor under this Section 11.01 is limited
to the maximum amount that will result in the obligations of the Guarantor not
constituting a fraudulent conveyance or fraudulent transfer under applicable
law.

                                       27

<PAGE>   34

         The Guarantor hereby waives diligence, presentment, filing of claims
with a court in the event of merger or bankruptcy of the Cash Manager, any right
to require a proceeding first against the Cash Manager, and the benefit of
discussion, protest or notice with respect to any and all demands for
performance or payment hereunder whatsoever (except as specified above), and
covenants that this Article 11 shall not be discharged except by performance or
payment in full of all of the Guaranteed Obligations.

         The Guarantor hereby irrevocably waives any claim or other rights which
it may now or hereafter acquire against the Cash Manager that arise from the
existence, payment, performance or enforcement of the Guarantor's obligations
under this Agreement or any other Related Document, including, without
limitation, any right of subrogation, reimbursement, exoneration, contribution,
indemnification, any right to participate in any claim or remedy of any party
against the Cash Manager, whether or not such claim, remedy or right arises in
equity, or under contract, statute or common law, including, without limitation,
the right to take or receive from the Cash Manager, directly or indirectly, in
cash or other property or in any other manner, payment or security on account of
such claim or other rights, until all of the Guarantor's obligations under this
Agreement have been satisfied. If any amount shall be paid to the Guarantor in
violation of the preceding sentence and this Agreement shall not have been
terminated, such amount shall be deemed to have been paid to the Guarantor for
the benefit of, and held in trust for the benefit of, AerCo Group and the
Servicer, and shall forthwith be paid to AerCo Group and the Servicer, as the
case may be. The Guarantor acknowledges that it will receive direct and indirect
benefits from the execution, delivery and performance by the Cash Manager of
this Agreement and that the waiver set forth in this paragraph is knowingly made
in contemplation of such benefits.

         SECTION 11.02. Reinstatement. The Guarantor hereby agrees that the
guarantee provided for in Section 11.01 hereof shall continue to be effective or
be reinstated, as the case may be, if at any time, payment, or any part thereof,
of any Guaranteed Obligations or interest thereon is rescinded or must otherwise
be restored to the Cash Manager upon the bankruptcy or insolvency of the Cash
Manager or the Guarantor or otherwise.

         SECTION 11.03. Unconditional Nature of Guarantee. The Guarantor hereby
agrees that its obligations under the guarantee set forth in Section 11.01
hereof shall be irrevocable and unconditional, irrespective of the invalidity,
irregularity or unenforceability of this Agreement or any other Related Document
against the Cash

                                       28

<PAGE>   35

Manager, the absence of any action to enforce the Cash Manager's obligations
hereunder or under any other Related Document, any waiver or consent by any
party hereto with respect to any provisions thereof, any amendment to the terms
hereof or of any other Related Document, the bankruptcy of the Cash Manager or
any circumstance which might otherwise constitute a legal or equitable discharge
or defense of a guarantor; provided, however, that the Guarantor shall be
entitled to exercise any right that the Cash Manager could have exercised under
this Agreement to cure any default in respect of its obligations hereunder or
under any other Related Document, if any, but only to the extent such right, if
any, is provided to the Cash Manager hereunder or under any other Related
Document.

                                   ARTICLE 12
                                  MISCELLANEOUS

         SECTION 12.01. Notices. (a) All notices, consents, directions,
approvals, instructions, requests and other communications required or permitted
by this Agreement to be given to any Person shall be in writing, and any such
notice shall become effective five Business Days after being deposited in the
mail, certified or registered, return receipt requested, with appropriate
postage prepaid for first class mail, or if delivered by hand or courier service
or in the form of a facsimile, when received (and, in the case of a facsimile,
receipt of such facsimile is confirmed to the sender), and shall be directed to
the address or facsimile number of such Person set forth below:

         If to the Cash Manager, to:

         debis Aircraft Leasing Limited
         as Cash Manager
         c/o debis AirFinance B.V.

                                       29

<PAGE>   36

         Evert van de Beekstraat 312
         NL-1118 CX Schipol Airport
         The Netherlands
         Attention:        Managing Director
         Copy:             General Counsel
         Facsimile:        31-20-6559-100

         If to the Guarantor, to:

         debis AirFinance B.V.

                                       30

<PAGE>   37

         Evert van de Beekstraat 312
         NL-1118 CX Schipol Airport
         The Netherlands
         Attention:        Managing Director
         Copy:             General Counsel
         Facsimile:        31-20-6559-100

         If to AerCo and the other AerCo Group Members, to:

         AerCo Limited

                                       31

<PAGE>   38

         22 Grenville Street
         St. Helier
         Jersey, JE4 8PX
         Channel Islands

                                       32

<PAGE>   39

         Attention:        Mourant & Co. Secretaries
                           Limited - Company Secretary
         Facsimile:        44-1534-609-333

         With a copy to:

         Davis Polk & Wardwell

                                       33

<PAGE>   40

         99 Gresham Street
         London EC2V 7NG
         England
         Attention:        Ms. Juliet Cain
         Facsimile:        44-20-7418-1400

         and

         debis Aircraft Leasing Limited
         as Administrative Agent
         c/o debis AirFinance B.V.
         Evert van de Beekstraat 312
         NL-1118 CX Schipol Airport
         The Netherlands
         Attention:        Managing Director

                                       34

<PAGE>   41

         Copy:             General Counsel
         Facsimile:        31-20-6559-100

         If to the Servicer, to:

         debis Aircraft Leasing Limited
         as Servicer
         c/o debis AirFinance B.V.
         Evert van de Beekstraat 312
         NL-1118 CX Schipol Airport
         The Netherlands
         Attention:        Managing Director

                                       35

<PAGE>   42

         Copy:             General Counsel
         Facsimile:        31-20-6559-100

         If to the Trustee or the Security Trustee, to:

         Bankers Trust Company
         Four Albany Street
         New York, New York 10006
         Attention:        Corporate Trust and Agency Group,
                           Structured Finance Team
         Facsimile:        212-250-6439
         Telephone:        212-250-6137

                                       36

<PAGE>   43

         If a notice or communication is mailed in the manner provided above
within the time prescribed, it is conclusively presumed to have been duly given
whether or not the addressee receives it.

         From time to time any party to this Agreement may designate a new
address or number for purposes of notices thereunder by notice to each of the
other parties thereto.

         SECTION 12.02.  Governing Law.  This Agreement shall be governed by
and construed in accordance with the laws of the State of New York.

         SECTION 12.03. Jurisdiction. Except as otherwise expressly provided in
this Agreement, the parties hereto agree that any suit, action or proceeding
seeking to enforce any provision of, or based on any matter arising out of or in
connection with, this Agreement or the transactions contemplated hereby may be
brought in the United States District Court for the Southern District of New
York or any other New York State court sitting in New York City, and each of the
parties hereby consents to the jurisdiction of such courts (and of the
appropriate appellate courts therefrom) in any such suit, action or proceeding
and irrevocably waives, to the fullest extent permitted by law, any objection
which it may now or hereafter have to the laying of the venue of any such suit,
action or proceeding in any such court or that any such suit, action or
proceeding which is brought in any such court has been brought in an
inconvenient forum. Process in any such suit, action or proceeding may be served
on any party anywhere in the world, whether within or without the jurisdiction
of any such court. Without limiting the foregoing, each party agrees that
service of process on such party as provided in Section 12.01 or 12.04 hereof
shall be deemed effective service of process on such party.

         SECTION 12.04. Agent for Service of Process. Each of AerCo and its
Subsidiaries hereby appoint Corporation Service Company, 80 State Street, 6th
Floor, Albany, N.Y., 12207, U.S.A. as its nonexclusive agent for service of
process in the United States in connection with this Agreement. The parties may
use any legally available means of service of process. Each of AerCo and its
Subsidiaries will promptly notify the other persons listed in Section 12.01
hereof of any change in the address of the respective agents; provided, however,
that each of AerCo and its Subsidiaries will at all times maintain an agent
located within New York State for service of process in connection with this
Agreement, the identity of any successor agent to be reasonably satisfactory to
the Cash Manager.

                                       37

<PAGE>   44

         SECTION 12.05. WAIVER OF JURY TRIAL. EACH OF THE PARTIES HERETO HEREBY
IRREVOCABLY WAIVES ANY AND ALL RIGHT TO TRIAL BY JURY IN ANY LEGAL PROCEEDING
ARISING OUT OF OR RELATED TO THIS AGREEMENT OR THE TRANSACTIONS CONTEMPLATED
HEREBY.

         SECTION 12.06. Counterparts; Third Party Beneficiaries. This Agreement
may be signed in any number of counterparts, each of which shall be an original,
with the same effect as if the signatures thereto and hereto were upon the same
instrument. This Agreement shall become effective when each party hereto shall
have received a counterpart hereof signed by the other party hereto. No
provision of this Agreement is intended to confer upon any Person other than the
parties hereto any rights or remedies hereunder.

         SECTION 12.07.  Entire Agreement.  This Agreement constitutes the
entire agreement between the parties with respect to the subject matter of this
Agreement and supersedes all prior agreements and understandings, both oral and
written, between the parties with respect to the subject matter of this
Agreement.

         SECTION 12.08. Table of Contents; Headings. The table of contents and
headings of the various articles, sections and other subdivisions of this
Agreement are for convenience of reference only and shall not modify, define or
limit any of the terms or provisions of this Agreement.

         SECTION 12.09. Restrictions on Disclosure. The Cash Manager agrees that
it shall not, prior to the termination or expiration of this Agreement or within
the three years after such termination or expiration, disclose to any Person any
confidential or proprietary information, whether of a technical, financial,
commercial or other nature, received directly or indirectly from AerCo Group
regarding AerCo Group or its business or the Aircraft, except as authorized in
writing by AerCo Group or otherwise permitted by this Agreement, and except:

          (a) to Representatives of the Cash Manager and any of its affiliates
in furtherance of the purposes of this Agreement, provided that any such
Representatives shall have agreed to be bound by the restrictions on disclosure
set forth in this Section 12.09;

          (b) to the extent (i) required by Applicable Law or by judicial or
administrative process, including pursuant to any subpoena, civil investigative
demand or similar demand or request of any court, regulatory authority,
arbitrator or arbitration to which the Cash Manager or an affiliate thereof is a
party, or (ii) reasonably

                                       38

<PAGE>   45

necessary in order to enable the Cash Manager to perform the Cash Management
Services, but in the case of clause (i) above, in the event of proposed
disclosure, the Cash Manager shall seek the assistance of AerCo Group to protect
information in which AerCo Group has an interest to the maximum extent
achievable;

         (c)   to the extent such information is required to be included in any
preliminary or final offering circular, registration statement or contract or
other document pertaining to the transactions contemplated by the Indenture and
the Related Documents approved in advance by AerCo;

         (d)   to the extent that the information:

         (i)   was generally available in the public domain;

         (ii)  was lawfully obtained from a source under no obligation of
         confidentiality, directly or indirectly, to AerCo Group;

         (iii) was disclosed to the general public with the approval of
         AerCo Group;

         (iv)  was in the files, records or knowledge of the Cash Manager or any
         Affiliates of the Cash Manager prior to initial disclosure thereof to
         the Cash Manager or any Affiliates of the Cash Manager by AerCo Group;
         and

         (v)   was developed independently by the Cash Manager or any
         Affiliates of the Cash Manager; and

         (e)   to the extent the Cash Manager reasonably deems necessary to
protect and enforce its rights and remedies under this Agreement; provided,
however, that in such an event the Cash Manager shall act in a manner reasonably
designed to prevent disclosure of such confidential information; and provided
further, that prior to disclosure of such information the Cash Manager shall
inform AerCo Group of such disclosure.

         SECTION 12.10. No Partnership. (a) It is expressly recognized and
acknowledged that this Agreement is not intended to create a partnership, joint
venture or other similar arrangement between any AerCo Group Member or Members
on the one part and the Cash Manager on the other part. It is also expressly
understood that any actions taken on behalf of any AerCo Group Member by the
Cash Manager shall

                                       39

<PAGE>   46

be taken as agent for such AerCo Group Member, either naming the relevant AerCo
Group Member, or naming the Cash Manager as agent for an undisclosed principal.
No AerCo Group Member shall hold itself out as a partner of the Cash Manager,
and the Cash Manager will not hold itself out as a partner of any AerCo Group
Member.

          (b) The Cash Manager shall not have any fiduciary duty or other
implied obligations or duties to any AerCo Group Member, any Lessee or any other
Person arising out of this Agreement.

                                       40

<PAGE>   47

         IN WITNESS WHEREOF, this Agreement has been duly executed on the date
first written above.

                                    DEBIS AIRCRAFT LEASING LIMITED,
                                    as Cash Manager

                                    By: _______________________________
                                           Name:
                                           Title:

                                    DEBIS AIRFINANCE B.V.,
                                    as Guarantor

                                    By: _______________________________
                                           Name:
                                           Title:

                                    AERCO LIMITED

                                    By: _______________________________

                                       41

<PAGE>   48

                                           Name:
                                           Title:

                                    DEBIS AIRCRAFT LEASING LIMITED,
                                         as Servicer

                                    By: _______________________________
                                           Name:
                                           Title:

                                       42

<PAGE>   49

                                    BANKERS TRUST COMPANY,
                                    not in its individual capacity,
                                    but solely as Security Trustee

                                    By: _______________________________
                                           Name:
                                           Title:

                                    BANKERS TRUST COMPANY,
                                    not in its individual capacity,
                                    but solely as trustee under the Indenture

                                    By: _______________________________
                                           Name:
                                           Title:

                                    AERCO IRELAND LIMITED

                                    By: _______________________________
                                           Name:
                                           Title:

                                    AERCO IRELAND II LIMITED

                                    By: _______________________________
                                           Name:
                                           Title:

                                    AERFI BELGIUM N.V.

                                       43

<PAGE>   50

                                    By: _______________________________
                                           Name:
                                           Title:

                                    AERCOUSA INC.

                                    By: _______________________________
                                           Name:
                                           Title:

                                    AIRCRAFT LEASE PORTFOLIO
                                    SECURITIZATION 94-1 LIMITED

                                    By: _______________________________
                                           Name:
                                           Title:

                                    ALPS 94-1 (BELGIUM) N.V.

                                    By: _______________________________
                                           Name:
                                           Title:

                                    PERGOLA LIMITED

                                    By: _______________________________
                                           Name:
                                           Title:

                                       44

<PAGE>   51

                                       45

<PAGE>   52

                                   APPENDIX A

                                  SUBSIDIARIES

AerCo Ireland Limited
AerCo Ireland II Limited
AerCoUSA Inc.
AerFi Belgium N.V.
Aircraft Lease Portfolio Securitization 94-1 Limited
ALPS 94-1 (Belgium) N.V.
Pergola Limited

<PAGE>   53

                                   APPENDIX B

                           FORM OF ACCESSION AGREEMENT

                                     [DATE]

         We refer to the Cash Management Agreement dated as of July 17, 2000,
among debis Aircraft Leasing Limited, as Cash Manager, debis AirFinance B.V., as
Guarantor, AerCo Limited, debis Aircraft Leasing Limited, as Servicer, Bankers
Trust Company, solely in its capacity as indenture trustee and security trustee,
the entities listed on Appendix A thereto and all other Subsidiaries which have
heretofore signed an Accession Agreement in substantially the form of this
Accession Agreement (the "CASH MANAGEMENT AGREEMENT").

         We agree, as of the date of this Accession Agreement, to be considered
a party to the Cash Management Agreement for all purposes, as if an original
signatory to the Cash Management Agreement, and to be bound by the terms of the
Cash Management Agreement.

         This Accession Agreement may be signed in any number of counterparts,
each of which shall be an original, with the same effect as if the signatures
thereto and hereto were upon the same instrument.

         IN WITNESS WHEREOF, this Accession Agreement has been duly executed on
the date first written above.

                                            [                      ]

                                            By:__________________________
                                                  Name:
                                                  Title:

<PAGE>   54

ACCEPTED AND ACKNOWLEDGED:

DEBIS AIRCRAFT LEASING LIMITED,
as Cash Manager

By: __________________________
      Name:
      Title:

DEBIS AIRFINANCE B.V.,
as Guarantor

By: __________________________
      Name:
      Title:

AERCO LIMITED

By: __________________________
      Name:
      Title:

DEBIS AIRCRAFT LEASING LIMITED,
as Servicer,

By: __________________________
      Name:
      Title:

<PAGE>   55

BANKERS TRUST COMPANY,
not in its individual capacity,
but solely as Security Trustee

By: __________________________
      Name:
      Title:

BANKERS TRUST COMPANY,
not in its individual capacity,
but solely as trustee under the Indenture

By: __________________________
      Name:
      Title:

<PAGE>   56

                                SCHEDULE 2.02(B)

                                    ACCOUNTS

BANKERS TRUST ACCOUNTS

<TABLE>
<CAPTION>
                                                                     Trustee
                                                                  Account Number
                                                                  --------------

<S>     <C>                                                           <C>
1.       RENTAL ACCOUNTS
         (a)      Bankers Trust Company, as Trustee for AerCo         00-377-799
         (b)      Bankers Trust Company, as Trustee for AerCo         00-377-801

2.       EXPENSE ACCOUNT
         Bankers Trust Company, as Trustee for AerCo                  00-377-828

3.       OTHER ACCOUNTS PURSUANT TO THE CASH MANAGEMENT AND
         INDENTURES
         AerCo Expense Account                                             26071
         AerCo Purchase Account                                            26076
         AerCo Note Account                                                26070
         AerCo Lessee Funded Account                                       26072
         AerCo Collection Account                                          26073
         AerCo Defeasance/Redemption Account                               26075
         AerCo Refinancing Account                                         26074

4.       ADDITIONAL BANK ACCOUNTS

         Account Name:    ALPS 1994-- 1 Belgium NV
         Bank:            Generale de Bank, Brussels
         Account No.:     210-0079736-54
         Currency:        Belgian Franc

         Account Name:    AerFi Belgium NV
</TABLE>

<PAGE>   57

<TABLE>
<CAPTION>
                                                                     Trustee
                                                                  Account Number
                                                                  --------------

<S>     <C>                                                           <C>
         Bank:            Citibank Brussels
         Account No.:     570-1192500-40
         Currency:        Belgian Franc

         Account Name:    AerFi Belgium NV
         Bank:            Citibank Brussels
         Account No.:     570-1192510-50
         Currency:        US Dollar

</TABLE>

<PAGE>   58

                                            EXHIBIT A

                      FORM OF CERTIFICATE REQUESTING DIRECT FUNDS TRANSFER

                                                                          [Date]

Bankers Trust Company,
as Trustee under the Indenture
Four Albany Street
New York, New York 10006

                         Re: Cash Management Agreement:
                        Request for Direct Funds Transfer
Sirs:

         The undersigned hereby requests that all amounts distributable to the
Expense payee named below pursuant to Section 2.06(f) of the Cash Management
Agreement dated as of July 17, 2000 (the "CASH MANAGEMENT AGREEMENT"; terms used
herein but not otherwise defined herein being used herein as therein defined),
among debis Aircraft Leasing Limited, as Cash Manager, debis AirFinance B.V., as
Guarantor, AerCo Limited, debis Aircraft Leasing Limited, as Servicer, Bankers
Trust Company, solely in its capacity as indenture trustee and security trustee
and the entities listed on Appendix A thereto, be transferred on each Payment
Date to the following account:

         [Name of Expense Payee]
         [Name of Bank]
         Account No. ________________________

         [Location]
         Attention: _________________________

         Please acknowledge your approval of the foregoing payment instructions
by executing a copy of this letter and returning it to _________ at __________.

                                         debis Aircraft Leasing Limited

                                            By: ______________________________

<PAGE>   59

                                                 Name:
                                                 Title:

Acknowledged and Approved:

BANKERS TRUST COMPANY,
not in its individual capacity,
but solely as trustee under the Indenture

By: ____________________________
    Name:
    Title:

<PAGE>   60

                                    EXHIBIT B

             FORM OF CERTIFICATE AUTHORIZING DELEGATION OF SERVICES

                                                                          [Date]
Bankers Trust Company,
as Trustee under the Indenture
Four Albany Street
New York, New York 10006

                         Re: Cash Management Agreement:
                 Delegation of Certain Cash Management Services

Sirs:

         Pursuant to Section 10.01 of the Cash Management Agreement dated as of
July 17, 2000 (the "CASH MANAGEMENT AGREEMENT"; terms used herein but not
otherwise defined herein being used herein as therein defined), among debis
Aircraft Leasing Limited, as Cash Manager (the "CASH MANAGER"), debis AirFinance
B.V., as Guarantor, AerCo Limited, debis Aircraft Leasing Limited, as Servicer,
Bankers Trust Company, solely in its capacity as indenture trustee and security
trustee and the entities listed on Appendix A thereto, the Cash Manager hereby
requests your approval to the delegation by it to [name] of cash disbursement
and related services.

         The Cash Manager acknowledges and agrees that the foregoing delegation
of services does not in any way release the Cash Manager from its obligations
under the Cash Management Agreement.
                                            debis Aircraft Leasing Limited

                                            By: _____________________________
                                                Name:
                                                Title:

<PAGE>   61

Acknowledged and Approved:

BANKERS TRUST COMPANY,
not in its individual capacity,
but solely as trustee under the Indenture

By: _____________________________
    Name:
    Title:

Acknowledged and Agreed:

[NAME]

By: _____________________________
    Name:
    Title:

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