<PAGE>   1
                                                                    EXHIBIT 10.8



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                         ADMINISTRATIVE AGENCY AGREEMENT


                                      among


                         debis Aircraft Leasing Limited,
                             as Administrative Agent


                             debis AirFinance B.V.,
                                  as Guarantor


                                  AerCo Limited

                         debis Aircraft Leasing Limited,
                                   as Servicer


                                       and


                    The Entities Listed on Appendix A Hereto


                            Dated as of July 17, 2000



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                                TABLE OF CONTENTS

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

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                                    ARTICLE 1
                                   DEFINITIONS

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

                                    ARTICLE 2
                      APPOINTMENT; ADMINISTRATIVE SERVICES

SECTION 2.01.  Appointment..............................................       8
SECTION 2.02.  Limitations..............................................       9
SECTION 2.03.  Administrative Services..................................      11
SECTION 2.04.  Accounting and Draft Accounts............................      19
SECTION 2.05.  Additional Administrative Services.......................      21
SECTION 2.06.  Additional Aircraft......................................      22
SECTION 2.07.  New Subsidiaries.........................................      22
SECTION 2.08.  AerCo Group Responsibility...............................      22

                                    ARTICLE 3
                STANDARD OF PERFORMANCE; LIABILITY AND INDEMNITY

SECTION 3.01.  Standard of Performance..................................      23
SECTION 3.02.  Liability and Indemnity..................................      23
SECTION 3.03.  Conflicts of Interest....................................      24

                                    ARTICLE 4
                        ADMINISTRATIVE AGENT UNDERTAKINGS

SECTION 4.01.  Administrative Agent Undertakings........................      25

                                    ARTICLE 5
                           UNDERTAKINGS OF AERCO GROUP

SECTION 5.01.  Cooperation..............................................      27
SECTION 5.02.  Information..............................................      28
SECTION 5.03.  Scope of Services........................................      28
SECTION 5.04.  Ratification.............................................      29
SECTION 5.05.  Covenants................................................      29
SECTION 5.06.  Ratification by Subsidiaries.............................      31
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                                    ARTICLE 6
                                    APPROVALS

SECTION 6.01.  Approvals................................................      31

                                    ARTICLE 7
                                  EFFECTIVENESS

SECTION 7.01.  Effectiveness............................................      31

                                    ARTICLE 8
                 ADMINISTRATIVE FEES, EXPENSES AND SUBORDINATION

SECTION 8.01.  Administrative Fees......................................      32
SECTION 8.02.  Expenses.................................................      33
SECTION 8.03.  Taxes....................................................      33
SECTION 8.04.  Payment of Expenses......................................      34
SECTION 8.05.  Subordination of Fees and Expenses.......................      34

                                    ARTICLE 9
           TERM, REMOVAL OF OR TERMINATION BY THE ADMINISTRATIVE AGENT

SECTION 9.01.  Term.....................................................      34
SECTION 9.02.  Cross-termination........................................      34
SECTION 9.03.  Right to Terminate.......................................      34
SECTION 9.04.  Consequences of Termination..............................      37
SECTION 9.05.  Survival.................................................      37

                                   ARTICLE 10
                            ASSIGNMENT AND DELEGATION

SECTION 10.01.  Assignment and Delegation...............................      38

                                   ARTICLE 11
                                    GUARANTEE

SECTION 11.01.  Guarantee...............................................      38
SECTION 11.02.  Reinstatement...........................................      39
SECTION 11.03.  Unconditional Nature of Guarantee.......................      39

                                   ARTICLE 12
                                  MISCELLANEOUS

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SECTION 12.01.  Notices.................................................      40
SECTION 12.02.  Governing Law...........................................      41
SECTION 12.03.  Jurisdiction............................................      41
SECTION 12.04.  Agent for Service of Process............................      42
SECTION 12.05.  WAIVER OF JURY TRIAL....................................      42
SECTION 12.06.  Counterparts; Third Party Beneficiaries.................      42
SECTION 12.07.  Entire Agreement........................................      42
SECTION 12.08.  Power of Attorney.......................................      42
SECTION 12.09.  Restrictions on Disclosure..............................      42
SECTION 12.10.  Rights of Setoff........................................      44
SECTION 12.11.  No Partnership..........................................      44
SECTION 12.12.  Implied Terms Excluded..................................      44
SECTION 12.13.  Table of Contents; Headings.............................      44
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Appendix A      Subsidiaries
Appendix B      Form of Accession Agreement
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                                       iv


<PAGE>   6



         ADMINISTRATIVE AGENCY AGREEMENT dated as of July 17, 2000 (the
"AGREEMENT"), among debis Aircraft Leasing Limited, a limited company
incorporated under the laws of Ireland (the "ADMINISTRATIVE AGENT"), debis
AirFinance B.V., a limited company incorporated under the laws of The
Netherlands (the "GUARANTOR"), AerCo Limited, a company incorporated under the
laws of Jersey, Channel Islands ("AerCo"), debis Aircraft Leasing Limited, as
Servicer (the "SERVICER") 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").

         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.

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

         "ADDITIONAL FEE" has the meaning assigned to such term in Section
8.01(a) hereof.

         "ADDITIONAL NOTES" has the meaning assigned to such term in the
Offering Memorandum.

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

         "ADMINISTRATIVE FEE" has the meaning assigned to such term in Section
8.01(a) hereof.

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

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

<PAGE>   7

         "AerCo GROUP" has the meaning assigned to such term in Section 2.01(a)
hereof.

         "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.

         "AIRCRAFT ASSET" has the meaning assigned to such term in the Servicing
Agreement.

         "ANNUAL APPRAISED VALUE" means the average Base Value of an Aircraft at
the time acquired by a member of AerCo Group as determined annually by three
independent appraisers, which initially shall be Aircraft Information Services,
Inc., BK Associates, Inc. and Airclaims Limited, or, thereafter, be such other
independent appraisers as may be selected by the Administrative Agent and
approved by the board of AerCo.

         "ASSET EXPENSES BUDGET" has the meaning assigned to such term in
Section 7.04(a) of the Servicing Agreement.

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

         "BUSINESS OBJECTIVES" means maximizing the present value of the cash
flows derived from the leases relating to the Aircraft over time, subject to the
constraints imposed by the Indenture and Servicing Agreement, and seeking to
achieve a balanced and diversified portfolio (including, without limitation,
with respect to lessees, geography and lease term lengths), in all cases taking
into


                                       2
<PAGE>   8


account the then-existing and anticipated market conditions affecting the
operating leases of used aircraft and the commercial aviation industry
generally.

         "CASH MANAGEMENT AGREEMENT" means the Cash Management Agreement dated
as of July 17, 2000, among debis Aircraft Leasing Limited, as Cash Manager, the
Guarantor, AerCo, Bankers Trust Company, solely in its capacity as indenture
trustee and security trustee and the entities listed on Appendix A thereto and
any other Subsidiary of AerCo which accedes thereto, as amended from time to
time.

         "CASH MANAGER" means debis Aircraft Leasing Limited, a limited company
organized under the laws of Ireland, as cash manager under the Cash Management
Agreement.

         "CONCENTRATION THRESHOLDS" has the meaning assigned to such term in
Section 2.02(a) of Schedule 2.02(a) of the Servicing Agreement.

         "CONFLICTS STANDARD" has the meaning assigned to such term in Section
3.02(b) of the Servicing Agreement.

         "CONSOLIDATED QUARTERLY DRAFT ACCOUNTS" has the meaning assigned to
such term in Section 2.04(b)(ii) hereof.

         "CONSOLIDATING QUARTERLY DRAFT ACCOUNTS" has the meaning assigned to
such term in Section 2.04(b)(iii) hereof.

         "CONTROL" of a Person (including, with its correlative meanings,
"controlled by" and "under common control with") means possession, directly or
indirectly, of power to direct or cause the direction of management or policies
(whether through ownership of securities or partnership or other ownership
interests, by contract or otherwise) of such Person.

         "DOLLARS" or "$" means the lawful money of the United States of
America.

         "DRAFT ACCOUNTS" has the meaning assigned to such term in Section
2.04(b)(iii) hereof.

         "EU" means the European Union.

         "FEE PERIOD" has the meaning assigned to such term in Section 8.01(a)
hereof.

         "FIXED FEE" has the meaning assigned to such term in Section 8.01
hereto.


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<PAGE>   9

         "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.

         "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" means with respect to any calendar year the result
(expressed as a decimal) of the following calculation:

                           IF = (X-1)  x  0.75

         where:

                  "IF" means the Inflation Factor;

                  "X" means the average of (a) the quotient (expressed as a
decimal) of (i) the U.S. CPI published in respect of the most recently ended
calendar year (the "New Year") divided by (ii) the U.S. CPI published in respect
of the calendar year immediately preceding the New Year and (b) the quotient
(expressed as a decimal) of (i) the Irish CPI published in respect of the New
Year divided by (ii) the Irish CPI published in respect of the immediately
preceding calendar year. For the avoidance of doubt, if X is less than 1, the
Inflation Factor shall be a negative number.

         "INITIAL PERIODS" has the meaning assigned to such term in Section
7.04(b) of the Servicing Agreement.

         "IRISH CPI" means the Consumer Price Index (all items) published
quarterly by the Central Statistics Office of Ireland (current base date
November 1989 = 100) or by any other Irish governmental department or other
Person to which the publication thereof may have been transferred. If the base
date for Irish CPI is at any time revised then Irish CPI shall be calculated for
the purposes hereof as so revised.

         "LEDGERS" has the meaning assigned to such term in Section 2.04(b)(i)
hereof.



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<PAGE>   10

         "LIEN" means, with respect to any asset, (a) any mortgage, deed of
trust, lien, pledge, encumbrance, charge or security interest in or on such
asset, (b) the interest of a vendor or a lessor which is not a Person within
AerCo Group under any conditional sale agreement, capital lease or title
retention agreement relating to such asset and (c) in the case of securities,
any purchase option, call or similar right of a third party with respect to such
securities.

         "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.

         "MAINTENANCE RESERVES" means the aggregate of

         (i)      any cash amount payable under a Lease and expressed as (a) a
                  maintenance reserve, (b) constituting a fund for application
                  towards the cost of maintenance, overhauls or repairs or (c)
                  supplemental rent payable by reference to the level of
                  utilization of such aircraft or of any engine, part or
                  complement thereof; and

         (ii)     any letters of credit, guarantees or other credit support
                  provided either as security for the cost of maintenance,
                  overhauls or repairs, or as security for the general
                  obligations of the Lessee under the Lease, but in an amount
                  calculated by reference to the level of utilization of such
                  aircraft or of any engine, part or complement thereof,

         in respect of all of the Leases.

         "MATERIAL ADVERSE EFFECT" with respect to any Person means an event,
condition, matter, change or effect that impacts or, insofar as reasonably can
be foreseen, in the future is likely to impact, in a material adverse manner,
the condition (financial or otherwise), properties, assets, liabilities,
earnings, capitalization, shareholders' equity, licenses or franchises,
businesses, operation or prospects of such Person or the ability of such Person
to consummate the transactions contemplated by the Indenture or to perform fully
any of its obligations under any of the Related Documents.

         "NOTES OFFERING" has the meaning assigned to such term in Section 8.01
hereof.



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<PAGE>   11

         "OFFERING MEMORANDUM" means the Offering Memorandum dated July 12,
2000, with respect to debt securities of AerCo.

         "OPERATING BUDGET" has the meaning assigned to such term in Section
7.04(a)(i) of the Servicing Agreement.

         "ONE YEAR PERIOD" has the meaning assigned to such term in Section
2.04(a) hereof.

         "PERIOD" has the meaning assigned to such term in Section 2.04(a)
hereof.

         "QUARTER" means each fiscal quarter of AerCo or any of its
Subsidiaries, as applicable.

         "RATINGS" means the ratings assigned to the Notes by the Rating
Agencies.

         "REIMBURSABLE EXPENSES" has the meaning assigned to such term in
Section 8.02(b) of this Agreement.

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

         "RELEVANT JURISDICTION" means, in the case of AerCo, Jersey, Channel
Islands; and, in the case of a Subsidiary of AerCo, the jurisdiction in which it
is incorporated, or if the context requires, tax resident.

         "RENTAL FEE" has the meaning assigned to such term in Section 8.01 of
this Agreement.

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

         "SCHEDULE 2.02(A) OF THE SERVICING AGREEMENT" has the meaning assigned
to such term in Section 2.03(m) hereof.

         "SECURITY TRUSTEE" means Bankers Trust Company, a New York banking
corporation, not in its individual capacity, but solely as security trustee
under 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.

         "SERVICE PROVIDERS" has the meaning assigned to such term in Section
2.02(d) hereof.



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<PAGE>   12

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

         "SERVICES" has the meaning assigned to such term in Section 2.02(a) of
the Servicing Agreement.

         "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.

         "STANDARD OF CARE" has the meaning assigned to such term in Section
3.01 of the Servicing Agreement.

         "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,
between 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.

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

         "STIPULATED INTEREST RATE" means, for any period, a rate per annum
equal to LIBOR in effect during such period plus 2% per annum.

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

         "THREE YEAR PERIOD" has the meaning assigned to such term in Section
2.04(a) hereof.

         "TRANSACTION COSTS" means all out-of-pocket expenses incident to any
Notes Offering (specifically excluding, except to the extent otherwise expressly
included herein, any direct or indirect commissions, discounts, fees or other



                                       7
<PAGE>   13

remuneration allowed or paid to any underwriters in connection with any such
Notes Offering), including the cost of printing any offering documents
(including the Offering Memorandum) and any expenses (including fees and
disbursements of counsel) incurred by any underwriters in connection with
qualification of the Notes for sale under the laws of such jurisdictions as the
underwriters designate and the printing of memoranda relating thereto, for any
fees charged by investment rating agencies for the rating of the Notes, for any
filing fees of the National Association of Securities Dealers, Inc. relating to
the Notes and for expenses incurred in distributing any Prospectuses.

         "TRUSTEE" means Bankers Trust Company, a New York banking corporation,
not in its individual capacity, but solely as trustee under the Indenture.

         "U.S. CPI" means with respect to any calendar year or any period during
any calendar year the "Consumer Price Index for All Urban Consumers (CPI-U) U.S.
City Average for All Items" published by the Bureau of Labor Statistics for the
United States Department of Labor (1982-1984=100). If the U.S. CPI shall be
converted to a different standard reference base or otherwise revised after the
date hereof, U.S. CPI shall thereafter be calculated with use of such new or
revised statistical measure published by the Bureau of Labor Statistics or, if
not so published, as may be published by any other reputable publisher of such
price index selected by Servicing Company.

         "U.K. GAAP" has the meaning assigned to such term in Section 2.04(b)(i)
hereto.

         "YEAR" means each 12 month fiscal year (or such shorter fiscal period
as agreed upon in the future) ended June 30 or as modified in the future.

                                    ARTICLE 2

                      APPOINTMENT; ADMINISTRATIVE SERVICES

         SECTION 2.01. Appointment. (a) AerCo hereby appoints the Administrative
Agent, with effect from the Start Date, as the provider of the administrative
and related services set forth in Sections 2.03 through 2.07 hereof (the
"ADMINISTRATIVE SERVICES") to AerCo and each Subsidiary of AerCo (collectively,
"AERCO GROUP") on the terms and subject to the conditions set forth in this
Agreement.

         (b) The Administrative Agent hereby accepts such appointment and agrees
to perform, with effect from the Start Date, the Administrative Services on the
terms and subject to the conditions set forth in this Agreement; provided,


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<PAGE>   14

however, that it shall not be a condition to the Administrative Agent's
performance of the Administrative Services that it shall have received a Start
Notice.

         (c) The Administrative Services do not include any service or matter
which is the responsibility of the Servicer under the Servicing Agreement, the
Cash Manager under the Cash Management Agreement, the Company Secretary under
the Secretarial Services Agreement or the company secretaries of AerCo Group's
Subsidiaries.

          (d) Notwithstanding any other provision of this Agreement to the
contrary, the Administrative Services shall not include any service or matter
that falls under the categories of "investment business services" or "investment
advice" under the Investment Intermediaries Act, 1995 or any other applicable
provision of Irish law that would require such services to be performed by an
entity that has obtained prior authorization from the Central Bank of Ireland.

         SECTION 2.02. Limitations. (a) The Administrative Agent agrees (with
respect to the Administrative Services agreed by it to be carried out hereunder)
to comply with the terms of the articles of incorporation, by-laws, trust
agreements or similar constituting documents of each Person within AerCo Group
and all agreements to which any Person within AerCo Group is a party (including
all Related Documents), provided that copies of such documents and agreements
have been delivered to the Administrative Agent and, without prejudice to the
foregoing, not to enter into, on behalf of any Person within AerCo Group, any
commitments, loans or obligations or charge, mortgage, pledge, encumber or
otherwise restrict or dispose of the property or assets or expend any funds of
any Person within AerCo Group save (i) as expressly permitted by the terms of
this Agreement or (ii) upon the express direction of, as applicable, any of the
boards of directors of AerCo or any of its Subsidiaries.

          (b) Each Person within AerCo Group hereby appoints AerCo to act as its
representative and, having been duly authorized to do so by each of its
Subsidiaries, as the representative of each of its Subsidiaries with respect to
any matter in respect of which any Person within AerCo Group, or AerCo Group as
a whole, is required or permitted to take any action pursuant to the terms of
this Agreement. Accordingly, in connection with the performance of the
Administrative Services, the Administrative Agent shall in all cases be entitled
to rely on the instructions (or other actions) of AerCo as representative of
each Person within AerCo Group. The Administrative Agent further agrees to make
reasonable efforts so as not to take any action inconsistent with the Servicing
Agreement.

                                       9
<PAGE>   15

          (c) In connection with the performance of the Administrative Services,
the Administrative Agent shall (i) have no responsibility for the failure of any
other Person (other than any Person acting as a delegate of the Administrative
Agent under this Agreement pursuant to Section 10.01 hereof) providing services
directly to AerCo Group to perform its obligations to AerCo Group, (ii) in all
cases be entitled to rely upon the instructions of AerCo Group or any of its
Representatives and upon notices, reports or other communications made by any
Person providing services to AerCo Group (other than any Affiliate of the
Administrative Agent) and shall not be responsible for the accuracy or
completeness of any such notices, reports or other communications except to the
extent that the Administrative Agent has actual notice of any matter to the
contrary and (iii) not be obligated to act in any manner which is reasonably
likely to (A) violate any Applicable Law, (B) lead to an investigation by any
Governmental Authority or (C) expose the Administrative Agent to any liabilities
for which, in the Administrative Agent's good faith opinion, adequate bond or
indemnity has not been provided.

         (d) Subject to the limitations set forth in Section 2.02(a) hereof, in
connection with the performance of the Administrative Services, the
Administrative Agent is expressly authorized by AerCo and each other Person
within AerCo Group (i) to engage in and conclude commercial negotiations with
the Persons providing services to AerCo Group, including, without limitation,
where the context permits, the Servicer, the Cash Manager, the Reference Agent,
the Company Secretary and other Persons performing similar services or advising
AerCo Group in each case other than an Affiliate of the Administrative Agent
(the "SERVICE PROVIDERS") and with their Representatives, and (ii) after such
consultation, if any, as the Administrative Agent deems necessary under the
circumstances, to act on such Person's behalf with regard to any and all matters
requiring any action on the part of the Administrative Agent under the Servicing
Agreement. AerCo Group agrees that it will give the Administrative Agent and the
Servicer 60 days' prior written notice of any limitation or modification of the
authority set forth in this Section 2.02(d).

         (e) The Administrative Agent may rely on the advice of any law firm,
accounting firm, risk management adviser, tax adviser, insurance adviser,
aircraft appraiser or other professional adviser appointed by any Person within
AerCo Group and any Person appointed in good faith by the Administrative Agent
and shall not be liable for any claim by any Person within AerCo Group to the
extent that it was acting in good faith upon the advice of any such persons.

          (f) Notwithstanding the appointment of, and the delegation of
authority and responsibility to, the Administrative Agent hereunder, AerCo and
each other Person within AerCo Group shall continue to have and exercise through
its board



                                       10
<PAGE>   16

of directors real and effective central control and management of all matters
related to its ongoing business, operations, assets and liabilities, subject to
matters that are expressly the responsibility of the Administrative Agent in
accordance with the terms of this Agreement, and each of AerCo and each other
Person within AerCo Group shall at all times conduct its separate ongoing
business in such a manner as the same shall at all times be readily identifiable
from the separate business of the Administrative Agent, and none of the Persons
within AerCo Group is merely lending its name to decisions taken by others.

         SECTION 2.03. Administrative Services. The Administrative Agent hereby
agrees to perform and provide the following services for each Person within
AerCo Group and their respective governing bodies:

          (a) administrative services:

               (i) except in such instances in which such preparation and
         distribution is required to be done by another party by Applicable Law,
         preparation and distribution, at such time as shall be agreed with the
         Administrative Agent, of draft board of directors' or trustees' meeting
         agendas and any other papers required in connection with such meetings;

               (ii) maintaining, or monitoring the maintenance of, the books,
         records, registers and associated filings of each Person within AerCo
         Group, other than those required to be maintained by the Company
         Secretary;

               (iii) providing any administrative assistance reasonably
         necessary to assist any Person within AerCo Group in carrying out its
         obligations, including providing timely notice of decisions to be made,
         or actions to be taken, under any of the Related Documents; provided,
         that if such obligations of AerCo Group under any of the Related
         Documents are only required upon receipt of notice to AerCo Group or
         the Administrative Agent, then the Administrative Agent shall provide
         such administrative assistance only to the extent it has received such
         notice or is otherwise aware of such obligations (it being understood
         that the Administrative Agent shall not be deemed to be otherwise
         aware of such obligations solely because notice has been provided to a
         Person within AerCo Group or to AerFi Group or any Affiliate of AerFi
         Group other than the Administrative Agent);

               (iv) providing information and other administrative services to
         enable AerCo Group to: (a) develop its interest rate management policy
         and developing financial models, cash flow projections and forecasts,
         by



                                       11
<PAGE>   17

         proposing such policies, models, projections and forecasts to the
         relevant board for approval, and, after such approval, implementing
         them to the extent required by AerCo Group, and (b) make its aircraft
         lease, sale and capital investment decisions, to the extent such
         information and assistance is not contemplated to be provided by the
         Servicer pursuant to the Servicing Agreement;

                (v) procuring, when the Administrative Agent considers in good
         faith that it is appropriate or necessary to do so, and coordinating
         the advice of, legal counsel, accounting, tax and other professional
         advisers at the expense of the relevant Person within AerCo Group, to
         assist such Person in carrying out its obligations, and supervising, in
         accordance with instructions from such Person, such legal counsel and
         other advisers;

                (vi) as frequently as is necessary for AerCo Group to comply
         with its obligations under the Related Documents and as required in
         connection with the acquisition of Additional Aircraft, arranging for
         the Appraisals to be made and providing the Appraisals to the relevant
         Service Providers;

                (vii) providing the Cash Manager with information with respect
         to the Annual Appraised Value of the Aircraft and any changes thereto;
         and

                (viii) providing assistance to the Servicer with respect to
         matters for which such assistance is contemplated by the Servicing
         Agreement or is reasonably necessary in order for the Servicer to
         perform its duties in accordance with the Servicing Agreement;

         (b) to monitor the performance of the Service Providers (provided that,
for the avoidance of doubt, this clause shall not preclude AerCo from being
entitled, by Special Board Resolution, to appoint other Persons to perform such
monitoring function) and to report on such performance to the board of directors
of AerCo on a quarterly basis, including:

                (i) with respect to the Servicer:

                       (A) monitoring and reviewing the information and other
                  reports provided by the Servicer pursuant to the Servicing
                  Agreement, including with respect to the status of Lease
                  payments, Lessee receivables, Maintenance Reserves, security
                  deposits, adjustments of rentals and claims against
                  Maintenance Reserves in accordance with Lease terms (to the
                  extent provided to the Administrative Agent);

                                       12
<PAGE>   18


                       (B) assisting in evaluating the Servicer's performance
                  relative to the Standard of Care and the Conflicts Standard;

                       (C) assisting in establishing standards for evaluating
                  the Servicer's performance relative to the terms of the
                  Servicing Agreement generally, assisting in evaluating such
                  performance against such standards and recommending action
                  with respect thereto;

                       (D) reviewing and providing advice with respect to
                  recommendations made by the Servicer for approval by any
                  Person within AerCo Group;

                       (E) monitoring the compliance of the Servicer with its
                  obligations under the Servicing Agreement; and

                       (F) authorization of payment by the Cash Manager of
                  invoices approved by the Servicer in accordance with Section
                  6.03 of Schedule 2.02(a) of the Servicing Agreement;

                  (ii)   with respect to the other Service Providers:

                       (A) to the extent not provided for in the relevant
                  agreement, assisting in establishing standards for performance
                  evaluation and compliance with the terms of such agreement;

                       (B) assisting in evaluating the performance and
                  compliance of each Service Provider against its obligations
                  under the relevant agreement or such standards as are
                  established pursuant to subsection 2.03(b)(ii)(A) above;

                       (C) monitoring and reviewing the information and reports
                  provided by the Cash Manager to the Administrative Agent and
                  the relevant Person within AerCo Group and reviewing and
                  providing advice with respect to such reports; and

                       (D) implementing any other request by Persons within
                  AerCo Group to evaluate the performance of the Service
                  Providers under the relevant agreements with such Persons
                  within AerCo Group, which shall be at the expense of such
                  Persons, to the extent services are required that are
                  materially greater in scope than those being provided pursuant
                  to the express terms of this Agreement;

                                       13
<PAGE>   19

          (c) to the extent that (i) the following services are not provided by
the other Service Providers, and (ii) the relevant information is provided to
the Administrative Agent by Persons within AerCo Group or the Service Providers,
to act as liaison with the Rating Agencies with respect to the rating impact of
any decisions on behalf of AerCo Group, including:

              (i) advising the Rating Agencies from time to time of any material
          changes in the Portfolio, coordinating with AerCo Group and the
          Service Providers and providing the Rating Agencies with such
          statistical and other information as they may from time to time
          request and in connection with the acquisition of Additional Aircraft
          (such information to be provided at AerCo Group's expense to the
          extent that providing such information requires services that are
          materially greater in scope than those being provided pursuant to the
          express terms of this Agreement);

              (ii) providing the Rating Agencies with the outstanding principal
          balances of each class or subclass of Notes and loan-to-value ratios
          (i.e., ratio of debt to Annual Appraised Value of AerCo Group's
          assets); and

              (iii) coordinating among AerCo Group, the Servicer and the
          Appraisers to ensure that the Appraisals are received as required;

          (d) to provide assistance to AerCo Group in procuring lessee consents,
novations and other documentation and in taking all other actions necessary in
connection with the reissue or amendment of letters of credit under which the
current beneficiary is AerFi Group plc, an Affiliate of AerFi Group plc, or any
other Person such that the new beneficiary becomes a Person within AerCo Group;

          (e) to provide assistance to AerCo Group in connection with (i) the
reissue or amendment of letters of credit under which the current beneficiary is
AerFi Group plc, an Affiliate of AerFi Group plc, or any other Person such that
the new beneficiary becomes a Person within AerCo Group, (ii) the re-lease
and/or sale of the Aircraft, (iii) the acquisition of Additional Aircraft and
issuance of Additional Notes, (iv) the issuance of Refinancing Notes and (v) any
other financing transactions relating to AerCo Group after the Start Date,
including:

              (i) coordinating with the Service Providers, legal and other
          professional advisers to monitor the protection of AerCo Group's
          interests and rights and coordinating the execution of documentation
          required at closings;

                                       14
<PAGE>   20

               (ii) providing qualified personnel to attend and provide
         administrative support (including the preparation of any certificates
         required pursuant to the Servicing Agreement) at the closings in
         connection with sales or re-leases of the Aircraft, if required (it
         being understood that the Administrative Agent will not be obligated
         to provide legal counsel or legal or technical services to AerCo
         Group);

               (iii) coordinating with AerCo Group and the Service Providers and
         assisting in the management of the closing process so that closings
         will occur on a timely basis;

               (iv) providing all necessary administrative support to complete
         any documentation and other related matters (including assistance in
         completing registration statements, offering memoranda and other
         offering or disclosure documents in connection with financings or
         refinancings); and

               (v)   appointing counsel and other appropriate professional
         advisers to represent AerCo Group in connection with any such closings;

          (f)   to coordinate with the Cash Manager, including:

               (i) reviewing the impact on AerCo Group's operation and financial
         condition and on the Notes of any proposal for the re-lease or sale of
         an Aircraft or the acquisition of Additional Aircraft;

               (ii) establishing any sales objectives in connection with
         expected cash flow needs;

               (iii) analyzing the effect of the budgets developed pursuant to
         Section 2.04(a) below on the expected cash flows of AerCo Group with
         respect to the payment of the Notes; and

               (iv) providing written notice to the Cash Manager identifying in
         reasonable detail Expenses, Lease obligations or other liabilities of
         Persons within AerCo Group for which interim withdrawals may be made
         pursuant to Sections 3.04 and 3.05 of the Indenture;

          (g) with respect to the implementation, following board approval, of
AerCo Group's interest rate management strategy (including hedging strategy),
(i) to obtain information and reports from, and, where it or the board deems
such opinions appropriate, the opinion of, third party advisers for the purpose
of making decisions as to hedging strategy and swap counterparties and to
apprise




                                       15
<PAGE>   21

the board of such opinions; (ii) to provide assistance with respect to
any closings on behalf of AerCo Group in connection with any such hedging
activities; (iii) to calculate the amount of any broken funding costs under any
swap agreements; (iv) at least every three months following the Start Date, to
provide administrative support to Persons within AerCo Group in seeking to enter
into additional swap agreements or to enable such Persons to sell at market
value or unwind part or all of any initial or future swap agreements entered
into by such Persons, in order to rebalance the fixed and floating mix of
interest obligations and the fixed and floating mix of Rental Payments and (v)
from time to time, to assist Persons within AerCo Group to sell at market value
or unwind part or all of any initial or future options on interest rate swaps
purchased by such Persons;

          (h) based on information produced or provided to it, to prepare, file
and/or distribute, with the assistance of outside counsel and auditors, if
appropriate, all reports to be prepared, filed and/or distributed by AerCo Group
or its governing bodies, subject to Board of Directors' approval in the case of
reports on Form 20-F and 6-K under the Exchange Act, including:

               (i) filings AerCo Group is required to make in various
         jurisdictions and preparing such filings or monitoring counsel and
         advisers in connection with the preparation and filing of such
         materials;

               (ii) compliance by AerCo Group with the periodic reporting
         requirements of the Exchange Act, in particular, working with
         necessary professional advisers to AerCo Group and the Service
         Providers, as appropriate, to prepare on behalf of AerCo Group and to
         arrange for the filing and distribution of an annual report on
         Form 20-F in respect of AerCo Group and any required reports on
         Form 6-K in respect of AerCo Group;

               (iii) reports required or recommended to be distributed to
         investors (including press releases), and managing investor relations
         on behalf of AerCo Group, and preparing or arranging for the
         preparation and distribution of such reports at AerCo Group's expense;
         and

               (iv) reports required to be filed with any Governmental
         Authorities, and preparing on behalf of AerCo Group or arranging for
         the preparation of and arranging for the filing of any reports
         required to be filed with any other entity in order for AerCo Group
         not to be in violation of Applicable Law or any applicable covenants;

          (i) with respect to amendments,

                                       16
<PAGE>   22

                (i) to report on the substance of any proposed amendments to
         any Related Documents other than the Leases;

                (ii) to the extent requested by AerCo Group or by the parties to
         Related Documents and subject to approval by the appropriate board of
         directors, to coordinate with AerCo Group's legal counsel, the other
         parties thereto and their counsel the preparation and execution of any
         amendments to the Related Documents (other than amendments relating to
         the Aircraft or the Leases), and to provide administrative support in
         the implementation of such amendments; and

                (iii) to the extent reasonably requested by the Servicer, to
         coordinate and provide assistance on behalf of AerCo Group with the
         Servicer and seek to obtain appropriate approvals to take any action
         which may be required to amend the terms of the Leases;

          (j) to the extent reasonably requested by the Servicer, to coordinate
and provide assistance on behalf of AerCo Group with the Servicer and outside
counsel in a Lessee default or repossession situation;

          (k) to authorize payment of certain bills and expenses (i) payable to
legal and professional advisers authorized to be engaged or consulted pursuant
to this Agreement or (ii) approved by the board of directors of AerCo or any of
its Subsidiaries, and remit approved invoices to the Cash Manager for payment
processing;

          (l) to provide to the Servicer periodically (but not more than once
each week) a statement of AerCo Group's interest rate hedging policies;

          (m) providing assistance to AerCo with respect to matters for which
action by AerCo is required under the Servicing Agreement and the Indenture,
including such assistance that may be necessary for AerCo to:

                (i) comply with Sections 6.06, 7.04 and 7.05 of the Servicing
         Agreement;

                (ii) provide such instructions to the Servicer as the Servicer
         may be entitled to receive under the Servicing Agreement, in
         interpreting the Indenture, the Concentration Thresholds and Annex 2 to
         Schedule 2.02(a) of the Servicing Agreement ("SCHEDULE 2.02(A) OF THE
         SERVICING AGREEMENt");

                                       17
<PAGE>   23

                (iii) direct the Servicer to amend the minimum hull and
         liability insurance coverage amounts set forth in Annex 1 to Schedule
         2.02(a) of the Servicing Agreement;

                 (iv) direct the Servicer that settlement offers received by the
         Servicer with respect to claims for damage or loss in excess of
         $2,000,000 with respect to an Aircraft Asset are acceptable;

                 (v) request periodic reports from the Servicer regarding
         insurance matters;

                 (vi) Grant approvals when such approvals are required by
         Section 7.05(a) and Schedule 2.02(a) of the Servicing Agreement;

                 (vii) provide the Servicer with such information as the
         Servicer may reasonably request in connection with the Concentration
         Thresholds;

                 (viii) recommend to the Servicer fixed rates of interest to be
         considered by the Servicer in connection with negotiation by the
         Servicer of proposed leases and advise the Servicer whether AerCo
         intends to enter into any swap agreements with respect to such
         proposed leases and as to the additional costs associated with such
         swap agreements;

                 (ix) take the action contemplated by Section 3.02(d) of
         Schedule 2.02(a) of the Servicing Agreement;

                 (x) direct the Servicer to arrange for the sale of an Aircraft
         Asset and certify to the Servicer that such sale complies with the
         terms of the Indenture;

                 (xi) direct the Servicer to arrange for the acquisition of
         Additional Aircraft;

                 (xii) direct the Servicer to cooperate with any additional
         refinancings, note offerings, corporate restructurings and any
         additional issuances of debt securities to fund such acquisitions;

                  (xiii) make any discretionary decisions, judgments or
         assumptions necessary in connection with the preparation of any
         projections, and provide the Servicer with any written policies and
         guidelines that the Servicer shall require in connection with such
         preparation; and



                                       18
<PAGE>   24


                  (xiv) request valuations of Aircraft Assets in accordance with
         Section 5.01 of Schedule 2.02(a) of the Servicing Agreement;

         it is expressly acknowledged that the Administrative Agent has
no authority to issue any instructions, directions, requests, approvals,
recommendations or decisions on behalf of AerCo or its Subsidiaries and that
its function in respect of such matters is to provide information,
administrative assistance and related advice to AerCo and its Subsidiaries,
which shall be entitled to take independent advice if so determined by Special
Board Resolution;

          (n) to inform the Board of Directors of AerCo as soon as is reasonably
practicable if the Administrative Agent believes that (i) net revenues generated
by the Leases will be insufficient to satisfy the payment obligations of AerCo
Group and (ii) an Event of Default will result from such insufficiency, and to
advise the Board of Directors as to any appropriate action to be taken (subject
to the provisions of the Related Documents) with respect to such insufficiency
and to cause the actions directed by the Board of Directors to be implemented so
as to avoid an Event of Default, if it is possible to do so; and

          (o)   to advise the Board of Directors of AerCo as to the appropriate
levels of the Liquidity Reserve Amount.

         SECTION 2.04.  Accounting and Draft Accounts.  (a) Budgeting Process.
The Administrative Agent shall, in accordance with the procedures, policies and
guidelines described below and on the basis of information generated by the
Administrative Agent and information provided by the Service Providers and
AerCo Group:

                  (i) in respect of the Initial Periods, each one Year period (a
         "ONE YEAR PERIOD") and each three Year Period (a "THREE YEAR PERIOD"
         and, together with a One Year Period, and an Initial Period, each a
         "PERIOD") during the term of the Servicing Agreement, and on behalf of
         AerCo Group, prepare and deliver to the Servicer, not later than 60
         days immediately preceding the commencement of each Year, a proposed
         Operating Budget and Asset Expenses Budget for such Period together
         with reasonably detailed information regarding the assumptions
         underlying such proposed Operating Budget and Asset Expenses Budget,
         such proposed Operating Budget and Asset Expenses Budget to be based,
         in part, on the information provided by the Servicer pursuant to
         Section 7.04(f) of the Servicing Agreement;

                  (ii) on behalf of AerCo Group, review and discuss with the
         Servicer the proposed Operating Budget and the Asset Expenses Budget
         prepared pursuant to Section 7.04 of the Servicing Agreement;



                                       19
<PAGE>   25

                  (iii) submit the revised proposed Operating Budget and Asset
         Expenses Budget for each Period, no later than 30 days immediately
         preceding the commencement of each Year, to AerCo for its
         consideration and approval; and

                  (iv) in the event that the proposed Operating Budget and
         Asset Expenses Budget are not approved, review and revise, in
         consultation with the Servicer, the Operating Budget and Asset
         Expenses Budget to the extent possible to address the concerns of
         AerCo, it being understood that final approval of the Operating Budget
         and Asset Expenses Budget is the responsibility of AerCo.

          (b) Management Accounts and Financial Statements. The Administrative
Agent shall, in accordance with the procedures, policies and guidelines
described below and on the basis of information generated by the Administrative
Agent and information provided by the Service Providers and AerCo Group:

                  (i) establish an accounting system and maintain the
         accounting ledgers of and for each Person within AerCo Group and their
         Subsidiaries in accordance with accounting principles generally
         accepted in the United Kingdom, ("U.K. GAAP"), unless otherwise
         required by Applicable Law and specified by the relevant board of
         directors of Persons within AerCo Group (collectively, the "LEDGERS");

                  (ii) prepare and deliver (within 40 days after the end of the
         relevant Quarter or, if the end of such Quarter coincides with the end
         of a Year, within 75 days after the end of such Year), with respect to
         AerCo Group, on a consolidated basis, a draft balance sheet and draft
         statement of changes in shareholders' equity or residual trust interest
         as of the end of each Quarter and Year, as applicable, and draft
         statements of income and cash flows for each Quarter and Year, as
         applicable (the "CONSOLIDATED QUARTERLY DRAFT ACCOUNTS");

                  (iii) to the extent required by Applicable Law, prepare and
         deliver (within 40 days after the end of the relevant Quarter or, if
         the end of such Quarter coincides with the end of a Year, within
         90 days after the end of such Year), with respect to AerCo Group and
         such Persons within AerCo Group as specified by the relevant board of
         directors of Persons within AerCo Group in a written schedule provided
         to the Administrative Agent (which schedule may be updated by such
         boards to the Administrative Agent delivered at least 30 days prior to
         the commencement of the




                                       20
<PAGE>   26

         relevant Quarter), on a consolidating company-by-company basis, a
         draft balance sheet and statement of changes in shareholders' equity
         or residual trust interest as of the end of each Quarter and Year, as
         applicable, with respect to such Person and draft statements of income
         and cash flows for such Quarter and Year, as applicable (the
         "CONSOLIDATING QUARTERLY DRAFT ACCOUNTS" and, together with the
         Consolidated Quarterly Draft Accounts the "DRAFT ACCOUNTS"). The Board
         of Directors of AerCo shall specify the applicable legal requirements
         mandating the preparation of such Consolidating Quarterly Draft
         Accounts in the written schedule provided to the Administrative Agent
         pursuant to this Section;

                    (iv) arrange for, coordinate with and assist AerCo Group's
         auditors in preparing annual audits;

                    (v) prepare or arrange for the preparation of and arrange
         for the filing of AerCo Group's tax returns in conjunction with AerCo
         Group's tax advisers after submission to the Board of Directors to the
         extent required by the Board of Directors or Applicable Law; and

                    (vi) compare the expected cash flows of AerCo Group, as
         provided by the Cash Manager, and the budgets to actual results.

         (c) The Administrative Agent shall be entitled to request instructions
from the Board of Directors of AerCo as to general guidelines or principles to
be followed in preparing Draft Accounts and as to amending or supplementing any
such guidelines or principles. The entry in the Ledgers of any item in
accordance with the specific instructions of AerCo Group shall always be
permitted, and the Administrative Agent shall make such entries upon
instruction.

         SECTION 2.05. Additional Administrative Services. The Administrative
Agent will provide additional Administrative Services, including (a) providing
assistance in arranging one or more refinancings of all or a portion of the
Notes, and (b) undertaking efforts to avoid any adverse change in the tax
status of any Person within AerCo Group. In addition, subject to Section 8.01(b)
hereof, upon a request by AerCo Group, the Administrative Agent will take such
other actions as may be appropriate to facilitate AerCo Group's business
operations and assist the relevant boards of directors or trustees in carrying
out their obligations; provided, however, that the Administrative Agent will
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, the Administrative Agent, the
Guarantor and any of their Affiliates.

                                       21
<PAGE>   27

         SECTION 2.06. Additional Aircraft. In the event that AerCo Group shall
acquire any Additional Aircraft and notwithstanding that AerCo Group may retain
different service providers for such Additional Aircraft, the Administrative
Agent hereby agrees to provide the same Administrative Services with respect to
all such Additional Aircraft.

         SECTION 2.07. New Subsidiaries. The Administrative Agent shall be
responsible for coordinating with outside legal counsel, auditors, tax advisers
and other professional advisers with respect to all corporate and administrative
matters relating to the formation, operation, corporate affairs and related
matters with respect to all Subsidiaries which are or may become members of
AerCo Group, including identifying such outside advisers, a potential company
secretary and candidates for director to the extent necessary, and shall be
permitted to incur expenses in respect of such Subsidiaries without AerCo
Group's consent up to such aggregate amount as shall be authorized from time to
time. To the extent that the Administrative Agent shall deem it necessary or
desirable in order for AerCo Group to carry on its business, the Administrative
Agent shall have the authority to assist in the formation of new Subsidiaries of
AerCo Group and to appoint any director or company secretary to any such
Subsidiary without the consent of AerCo Group. The Administrative Agent and its
personnel may act as company secretary for any Subsidiary.

         SECTION 2.08. AerCo Group Responsibility. (a) The obligations of the
Administrative Agent hereunder are limited to those matters that are expressly
the responsibility of the Administrative Agent in accordance with the terms of
this Agreement. Notwithstanding the appointment of the Administrative Agent to
perform the Administrative Services, AerCo Group shall remain responsible for
all matters and decisions related to its business, operations, assets and
liabilities.

          (b) Without derogating from the authority and responsibility of the
Administrative Agent with respect to the performance of certain of the
Administrative Services as set forth in this Agreement, it is hereby expressly
agreed and acknowledged that the Administrative Agent is not authorized or
empowered to make or enter into any agreement, contract or other legally binding
arrangement, in respect of or relating to the business or affairs of AerCo
Group, or pledge the credit of, incur any indebtedness on behalf of or expend
any funds of any Person within AerCo Group other than as expressly permitted in
accordance with the terms of this Agreement, all such authority and power being
reserved to appropriate Persons within AerCo Group.


                                    ARTICLE 3


                                       22
<PAGE>   28

                STANDARD OF PERFORMANCE; LIABILITY AND INDEMNITY

         SECTION 3.01. Standard of Performance. The Administrative Agent will
devote the same amount of time and attention to and will be required to exercise
the same level of skill, care and diligence in the performance of the
Administrative Services as it would if it were administering such services on
its own behalf (the "STANDARD OF PERFORMANCE").

         SECTION 3.02. Liability and Indemnity. (a) The Administrative Agent
shall not be liable for any Losses or Taxes to or of or payable by AerCo Group
at any time from any cause whatsoever or any Losses or Taxes directly or
indirectly arising out of or in connection with or related to the performance by
the Administrative Agent of this Agreement unless such Losses or Taxes are the
result of the Administrative Agent's own wilful misconduct or gross negligence
or that of any of its directors, officers, agents or employees, as the case may
be.

          (b) Notwithstanding anything to the contrary set forth in any other
agreement to which any Person within AerCo Group is a party, AerCo and each
other Person within AerCo Group do hereby assume liability for and do hereby
agree to indemnify and hold harmless on an After-Tax Basis the Administrative
Agent, its directors, officers, employees and agents and each of them from any
and all Losses or Taxes that may be imposed on, incurred by or asserted against
any of them arising out of, in connection with or related to the Administrative
Agent's performance under this Agreement (including any Losses or Taxes incurred
by the Administrative Agent as a result of indemnifying any Person to whom it
shall have delegated its obligations hereunder in accordance with Section 10.01
hereof, but only to the extent the Administrative Agent would have been
indemnified had it performed such obligations), except as a result of the gross
negligence or wilful misconduct of the Administrative Agent or any of its
directors, officers, employees or agents. This indemnity shall not apply to:

               (i) Taxes imposed on net income by the revenue authorities of
         Ireland in respect of any payment by AerCo Group to the Administrative
         Agent due to the performance of the Administrative Services; and

               (ii) Taxes imposed on net income of the Administrative Agent by
         any Government Authority other than Irish Authorities to the extent
         such Taxes would not have been imposed in the absence of any
         connection of the Administrative Agent with such jurisdiction imposing
         such Taxes other than any connection that results from the performance
         by the Administrative Agent of its obligations under this Agreement.


                                       23
<PAGE>   29

         This indemnity shall expressly inure to the benefit of any director,
officer, agent or employee of the Administrative Agent now existing or in the
future and to the benefit of any successor of the Administrative Agent and shall
survive the expiration of this Agreement.

          (c) The Administrative Agent agrees to indemnify and hold harmless on
an After-Tax Basis each Person within AerCo Group, its directors or trustees and
its agents for any Losses whatsoever which they or any of them may incur or be
subject to in consequence of the performance of the Administrative Services or
any breach of the terms of this Agreement by the Administrative Agent, but only
to the extent such Losses arise due to the gross negligence, wilful misconduct
or fraud of the Administrative Agent or any of its directors, officers or
employees, as the case may be; provided, however, that this indemnity shall not
apply and the Administrative Agent shall have no liability in respect of Losses
to the extent that they arise from (i) the wilful misconduct, recklessness or
gross negligence of any Person within AerCo Group, its directors, trustees or
agents, (ii) any breach by the Administrative Agent of its obligations under
this Agreement to the extent such breach is a result of a failure by AerCo Group
to comply with its obligations under this Agreement, (iii) any action that AerCo
Group requires the Administrative Agent to take pursuant to a direction but only
to the extent that the Administrative Agent takes such action in accordance with
such direction and in accordance with the provisions hereof or (iv) a refusal by
AerCo Group to take action upon a recommendation made in good faith by the
Administrative Agent in accordance with the terms hereof.

         SECTION 3.03. Conflicts of Interest. (i) Each of AerCo and the
Subsidiaries acknowledges and agrees that (a) in addition to providing the
Administrative Services under this Agreement, debis Aircraft Leasing Limited may
provide similar services for itself and for other third parties; (b) debis
Aircraft Leasing Limited has been appointed to act as Cash Manager and as
Servicer, (c) in the course of conducting such activities, the Administrative
Agent will from time to time have conflicts of interest in performing its duties
on behalf of AerCo Group, itself and any other entities in respect of which it
provides such similar services; and (d) AerCo Group has approved the
transactions contemplated by this Agreement and desires that such transactions
be consummated and in giving such approval has expressly recognized that such
conflicts of interest may arise and that when such conflicts of interest arise,
the Administrative Agent shall promptly report the same to AerCo Group and shall
act in a manner that (i) treats AerCo Group equally with such other entities,
(ii) does not violate the Standard of Performance set forth in Section 3.01
hereof or any of the covenants of the Administrative Agent set forth in
Article 4 hereof and (iii) would not be reasonably likely to have a Material
Adverse Effect on AerCo Group.

                                       24
<PAGE>   30

        (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 administrative and related services by
the Administrative Agent hereunder, including in connection with any conflict of
interest or any potential conflict of interest.



                                    ARTICLE 4

                        ADMINISTRATIVE AGENT UNDERTAKINGS

         SECTION 4.01. Administrative Agent Undertakings. The Administrative
Agent hereby covenants with AerCo Group that it will conduct its business such
that it is a separate and readily identifiable business from, and independent
of, AerCo Group and further covenants as follows (it being understood that these
covenants shall not prevent any Person within AerCo Group from publishing
financial statements that are consolidated with those of the Guarantor, if to do
so is required by Applicable Law or accounting principles from time to time in
effect:

          (a) if the Administrative Agent receives any money whatsoever, which
money belongs to AerCo Group or is to be paid to AerCo Group or into any account
pursuant to any Related Document or otherwise, it will hold such money in trust
for AerCo Group, and shall keep such money separate from all other money
belonging to the Administrative Agent and shall as promptly as practicable
thereafter pay the same into the relevant account in accordance with the terms
thereof without exercising any right of setoff;

          (b) it will comply with any proper directions, orders and instructions
which AerCo Group may from time to time give to it in accordance with the
provisions of this Agreement;

          (c) it will not knowingly fail to comply with any legal requirements
in the performance of the Administrative Services;

          (d) unless to do so would be in accordance with the Indenture, it will
not take any steps for the purpose of procuring the appointment of any
administrative receiver or the making of an 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 Person within AerCo Group or in respect of any
of their liabilities,



                                       25
<PAGE>   31

including, without limitation, as a result of any claim or interest of the
Administrative Agent or any of its Affiliates;

          (e) it will promptly take or arrange (through the appointment of
counsel or accountants, as appropriate, and by coordinating with the Company
Secretary) for the taking of all steps as may be reasonable to ensure that the
Company Secretary prepares and files the application of AerCo to renew its
annual exemption from Jersey taxation, including coordinating and arranging for
the filing of all necessary papers with the appropriate Jersey fiscal and other
authorities;

          (f) it will cooperate with AerCo Group and its agents and directors,
including by providing such information as may reasonably be requested, to
permit AerCo Group or its authorized agents to monitor the Administrative
Agent's compliance with its obligations under this Agreement;

          (g) during the term of this Agreement, it will observe all corporate
formalities necessary to remain a legal entity separate and distinct from, and
independent of each Person within AerCo Group;

          (h) during the term of this Agreement, it will maintain its assets and
liabilities separate and distinct from each Person within AerCo;

          (i) during the term of this Agreement, it will maintain records,
books, accounts and minutes separate from those of each Person within AerCo
Group;

          (j) during the term of this Agreement, it will pay its obligations in
the ordinary course of its business as a legal entity separate from each Person
within AerCo Group;

          (k) during the term of this Agreement, it will keep its funds separate
and distinct from the funds of each Person within AerCo Group, and it will
receive, deposit, withdraw and disburse such funds separately from the funds of
such Person;

          (l)   during the term of this Agreement, it will conduct its business
in its own name, and not in the name of any Person within AerCo Group;

          (m) during the term of this Agreement, it will not pay or become
liable for any debt of any Person within AerCo Group, other than to make
payments in the form of indemnity as required by the express terms of this
Agreement;

                                       26
<PAGE>   32

          (n) during the term of this Agreement, it will not hold out that it is
a division of any Person within AerCo Group, or that any such Person is a
division of it;

          (o) during the term of this Agreement, it will not induce any third
party to rely on the creditworthiness of any Person within AerCo Group in order
that such third party will be induced to contract with it;

          (p) during the term of this Agreement, it will not enter into any
agreements between it and any Person within AerCo Group 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);

          (q) during the term of this Agreement, it will devote at least one of
its employees to working full time on behalf of AerCo Group; and

          (r) during the term of this Agreement, it will (i) forward promptly to
the Servicer a copy of any material communication received from any Person in
relation to any Lease or Aircraft; (ii) grant such access to the Servicer to its
books of account, documents and other records and to its employees as may be
reasonably necessary for the Servicer to perform its obligations in respect of
any Lease or Aircraft under the Servicing Agreement; and (iii) execute and
deliver such documents and do such acts and things as the Servicer may
reasonably request in order to effect the purposes of the Servicing Agreement.

                                    ARTICLE 5

                           UNDERTAKINGS OF AERCO GROUP

         SECTION 5.01. Cooperation. AerCo and the other Persons within AerCo
Group, shall use commercially reasonable efforts to cause any Service Provider
to, at all times cooperate with the Administrative Agent to enable the
Administrative Agent to provide the Administrative Services, including providing
the Administrative Agent with all powers of attorney as may be reasonably
necessary or appropriate for the Administrative Agent to perform the
Administrative Services in accordance with this Agreement.

                                       27
<PAGE>   33

         SECTION 5.02.  Information.  AerCo or its agents will provide the
Administrative Agent with the following information in respect of itself and all
other Persons within AerCo Group:

          (a) copies of all Related Documents, including the articles of
incorporation, by-laws, trust agreements (or equivalent documents) of each such
Person, and copies of all books and records maintained on behalf of such
Persons;

          (b) details of all bank accounts and bank mandates maintained by any
Person within AerCo Group;

          (c) names of and contact information with respect to the board of
directors, board of trustees, company secretaries and registered offices of any
Person within AerCo Group;

          (d) such other information as is necessary to the Administrative
Agent's performance of the Administrative Services; and

          (e) a copy of any information provided to AerCo Group pursuant to the
Servicing Agreement;

          provided, that such information as is referred to in this
Section 5.02 (with the exemption of paragraph (e)) shall be provided to the
Administrative Agent on or promptly after the Start Date and, in respect of any
amendment or changes to the information provided to the Administrative Agent,
promptly following the effectiveness of such amendments or changes.

         SECTION 5.03. Scope of Services. (a) In the event that any Person
within AerCo Group shall enter into any agreement, amendment or other
modification of any Leases or shall take any other action that has the effect of
increasing in any material respect the scope, nature or level of the
Administrative Services to be provided under this Agreement without the
Administrative Agent's express prior written consent, AerCo Group shall so
notify the Administrative Agent and the Administrative Agent shall not be
obligated to perform the affected Administrative Service to the extent of such
increase unless and until the Administrative Agent and AerCo Group shall agree
on the terms of such increased Administrative Service (it being understood that
(i) the Administrative Agent shall have no liability to any Person within AerCo
Group directly or indirectly arising out of, in connection with or related to
the Administrative Agent's failure to perform such increased Administrative
Service prior to any such agreement and (ii) AerCo Group shall not be permitted
to engage another Person to perform the affected Administrative Service without
the prior written consent of the Administrative Agent unless the Administrative
Agent has



                                       28
<PAGE>   34

indicated it is unable or unwilling to act in respect of the affected
Administrative Service).

          (b) In the event that AerCo Group shall acquire Additional Aircraft,
AerCo Group shall so notify the Administrative Agent and the Administrative
Agent shall be obligated to provide the Administrative Services with respect to
such Additional Aircraft in accordance with Section 2.06 hereof.

         SECTION 5.04. Ratification. 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 Administrative Agent) any act or
omission by the Administrative Agent in accordance with this Agreement in the
exercise of any of the powers or authorities conferred upon the Administrative
Agent 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
Administrative Agent in violation of this Agreement, the Standard of Performance
or for which the Administrative Agent is obligated to indemnify any AerCo Group
Member or any Subsidiary under Article 3 hereof.

         SECTION 5.05. Covenants. Each of AerCo and the other Persons within
AerCo Group covenants with the Administrative Agent that it will conduct its
business such that it is a separate and readily identifiable business from, and
independent of, the Administrative Agent, the Guarantor and any of its
Affiliates (it being understood that these covenants shall not prevent any
Person within AerCo Group from publishing financial statements that are
consolidated with those of the Guarantor, if to do so is required by Applicable
Law or accounting principles from time to time in effect);

          (a) during the term of this Agreement, it will observe, and will cause
its Subsidiaries to observe, all corporate formalities necessary to remain legal
entities separate and distinct from, and independent of, the Administrative
Agent, the Guarantor and any of its Subsidiaries;

          (b) during the term of this Agreement, it will maintain, and will
cause its Subsidiaries to maintain, each of their respective assets and
liabilities separate and distinct from those of the Administrative Agent;

          (c) during the term of this Agreement, it will maintain, and will
cause its Subsidiaries to maintain, records, books, accounts, and minutes
separate from those of the Administrative Agent;


                                       29
<PAGE>   35

          (d) during the term of this Agreement, it will pay, and will cause its
respective Subsidiaries to pay, each of their respective obligations in the
ordinary course of business as legal entities separate from the Administrative
Agent;

          (e) during the term of this Agreement, it will keep, and will cause
its Subsidiaries to keep, each of their respective funds separate and distinct
from any funds of the Administrative Agent, and will receive, deposit, withdraw
and disburse such funds separately from any funds of the Administrative Agent;

          (f) during the term of this Agreement, it will conduct, and will cause
its respective Subsidiaries to conduct, each of their respective businesses in
their own name, and not in the name of the Administrative Agent;

          (g) during the term of this Agreement, it will not agree, and will
cause its Subsidiaries not to agree, to pay or become liable for any debt of the
Administrative Agent, 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 will not hold out, and will
cause its Subsidiaries not to hold out, that any of them is a division of the
Administrative Agent, or that the Administrative Agent is a division of any of
them;

          (i) during the term of this Agreement, it will not induce, and will
cause its Subsidiaries not to induce, any third party to rely on the
creditworthiness of the Administrative Agent in order that such third party will
be induced to contract with it;

          (j) during the term of this Agreement, it will not enter into, and
will cause its Subsidiaries not to enter into, any transaction between any of
them and the Administrative Agent that are 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 will observe, and it will
cause its Subsidiaries to observe, all material corporate or other procedures
required under Applicable Law and under each of their respective constitutive
documents.

         SECTION 5.06. Ratification by Subsidiaries. AerCo hereby undertakes to
procure that, if so requested by the Administrative Agent, any subsidiary of
AerCo



                                       30
<PAGE>   36

formed or acquired after the date hereof, shall execute an agreement with
the Administrative Agent adopting and confirming, as regards such Subsidiary,
the terms of this Agreement, and agreeing to ratify anything done by the
Administrative Agent in connection herewith.

                                    ARTICLE 6

                                    APPROVALS

         SECTION 6.01. Approvals. The Administrative Agent recognizes that
certain instructions hereunder and under the other Related Documents to be given
by AerCo Group may also require the approval of an AerCo Group Subsidiary. In
such circumstances, the Administrative Agent will seek approval from the
relevant AerCo Group Subsidiary and shall report on such approval to AerCo
Group; provided, however, that nothing herein shall in any way diminish any
authority which may be granted to AerCo to act as representative of each Person
within the AerCo Group.

                                    ARTICLE 7

                                  EFFECTIVENESS

         SECTION 7.01.  Effectiveness.  The effectiveness of this Agreement and
all obligations of the parties hereunder with respect to each Aircraft Asset
shall be conditional upon:

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

                (ii) with respect to AerCo, the Servicer, the Administrative
         Agent, the Guarantor 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 Administrative Agent and the
         Guarantor. 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.


                                       31
<PAGE>   37


                                    ARTICLE 8

                 ADMINISTRATIVE FEES, EXPENSES AND SUBORDINATION

         SECTION 8.01. Administrative Fees. (a) In consideration of the
Administrative Agent's performance of the Administrative Services, AerCo Group
agrees to pay to the Administrative Agent the following fees: (i) a fee (an
"ADMINISTRATIVE FEE") of 2.0% of the rental payments made by the Lessees with
respect to periods subsequent to the Start Date under the Leases received in
respect of each Fee Period from AerCo in respect of its services to AerCo (the
"RENTAL FEE") subject to an annual minimum of $200,000 (the "FIXED FEE"); and

         (ii) a fee for participation in and cooperation with refinancings and
other public or private offerings and sales after the Start Date of any
securities of AerCo or any of its Affiliates ("NOTES OFFERINGS") of 0.025% of
the Net Proceeds of any such offering (the "ADDITIONAL FEE"). "NET PROCEEDS"
means the cash proceeds received by any person selling Notes (other than
underwriters) within AerCo Group or any other person in connection with any
Notes Offering, less Transaction Costs incurred by any person within AerCo Group
or any such other person in connection with any such Notes Offering (other than
the fees payable pursuant to this Section 8.01).

         The Administrative Fee shall be payable in arrears for each period
commencing on the Start Date (or, thereafter, the most recent Calculation Date)
and ending on the next succeeding Calculation Date during the term of this
Agreement (each such period, a "FEE PERIOD"), such payment to be made no later
than the Payment Date immediately following the end of each such Fee Period.

          (b) The above fees have been calculated on the basis of estimated time
and resources having regard to the expectations of AerCo Group and the
Administrative Agent concerning the services required from the Administrative
Agent. To the extent the performance of the Administrative Services requires an
investment of time, resources or services that is materially greater or less
than anticipated, the Administrative Agent and AerCo Group shall negotiate in
good faith to arrive at an adjustment to the Administrative Fees that
appropriately reflects the work performed by the Administrative Agent.

          (c) The Fixed Fee shall be automatically adjusted as of each March 31
during the term of this Agreement commencing March 31 of the calendar year
immediately succeeding the calendar year in which the Start Date occurs, for


                                       32
<PAGE>   38

inflation by multiplying such fees in effect on such March 31 by the sum of 1.00
plus (if positive) or minus (if negative) the Inflation Factor with respect to
the immediately preceding calendar year.

         SECTION 8.02.  Expenses.  (a) The Administrative Agent shall be
responsible for all telephone, facsimile and communications costs and expenses
directly relating to or associated with the Administrative Agent's performance
of its duties as set forth in this Agreement up to an annual amount of $200,000.

          (b) Subject to the provisions of Section 8.02(a) and Section 8.05
hereof, AerCo Group shall be responsible for the following expenses incurred by
the Administrative Agent in the performance of its obligations ("REIMBURSABLE
EXPENSES"):

               (i) reasonable out of pocket expenses, including travel,
         accommodation and subsistence and approved expenditures in respect of
         insurance coverage for the Administrative Agent;

               (ii) annual telephone, fax and communication costs and expenses
         necessarily and directly incurred in connection with the performance of
         the Administrative Services in excess of $200,000;

               (iii) expenses expressly authorized by (i) the board of
         directors of any Person within AerCo Group or (ii) any Person to whom
         such authority has been delegated, other than the Administrative Agent
         or its Affiliates; and

               (iv) expenses expressly authorized pursuant to other provisions
         of this Agreement.

         SECTION 8.03. Taxes. The fees specified in Section 8.01 hereof are net
of any value added tax required to be accounted for by the Administrative Agent.
Where the Administrative Agent is required to account for value added tax in
respect of any amounts payable by or on behalf of AerCo Group to the
Administrative Agent, AerCo Group shall cause to be paid to the Administrative
Agent such additional amounts as are necessary to discharge such value added tax
upon production of a valid value added tax invoice. AerCo Group and the
Administrative Agent shall cooperate in good faith to file an application for
relief from value added taxes on VAT Form 60A as soon as practicable after the
date of this Agreement.

         SECTION 8.04. Payment of Expenses. No later than each Calculation Date,
the Administrative Agent shall deliver a notice to the Cash Manager and AerCo


                                       33
<PAGE>   39

Group, setting forth the amounts of expenses paid by the Administrative Agent
pursuant to Section 8.02 hereof through and including such Calculation Date (it
being understood that if there are no such expenses the Administrative Agent
will be under no obligation to provide such notice). Subject to Section 8.05
hereof, on the next Payment Date following such Calculation Date, AerCo Group
agrees to pay to the Administrative Agent all such amounts.

         SECTION 8.05. Subordination of Fees and Expenses. The Administrative
Agent agrees that the fees payable to it under Section 8.01 hereof and the
Reimbursable Expenses shall be paid to it in accordance with the Indenture, and
that all such fees and Reimbursable Expenses shall be subordinated in right of
payment to all other payments set forth in the Indenture as ranking higher in
priority of payment thereto.

                                    ARTICLE 9

           TERM, REMOVAL OF OR TERMINATION BY THE ADMINISTRATIVE AGENT

         SECTION 9.01. 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 Notes and the Class E
Notes) and any other securities issued by AerCo relating to Additional Aircraft
owned by AerCo Group.

         SECTION 9.02.  Cross-termination.  This Agreement shall terminate in
the event of a termination of either the Servicing Agreement or the Cash
Management Agreement.

         SECTION 9.03.  Right to Terminate.  (a) At any time during the term of
this Agreement, AerCo Group by a Special Board Resolution shall be entitled to
terminate this Agreement on 120 days' written notice if:

               (i) the Administrative Agent shall materially breach any of its
         obligations under this Agreement and, after written notice from AerCo
         the Administrative Agent 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 Administrative Agent, or
         of a substantial part of the property or assets of the Administrative
         Agent, 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,



                                       34
<PAGE>   40

         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 the Administrative
         Agent, 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 60 days; or

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

               (i) any AerCo Group entity shall fail to pay in full when due
         (A) any Administrative Fee within 30 days or any Reimbursable Expenses
         in an aggregate amount in excess of $750,000 within 30 days, in either
         case, after the effectiveness of written notice from the
         Administrative Agent of such failure or (B) any other amount payable
         to the Administrative Agent hereunder, within 60 days after written
         notice from the Administrative Agent of such failure;

               (ii) any Person within AerCo Group 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 (b)(i) of this Section 9.03);

               (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 Person
         within AerCo Group, or of a substantial part of the property or assets
         of any of AerCo or any other Person within AerCo Group 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



                                       35
<PAGE>   41

         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 Person within AerCo Group 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 60 days; or

               (iv) AerCo or any other Person within AerCo Group 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 9.03(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.

          (c) Notwithstanding anything to the contrary in this Section 9, no
termination of this Agreement pursuant to Section 9.02 hereof, no termination of
this Agreement by AerCo Group pursuant to Section 9.03(a) hereof and no
termination of this Agreement by the Administrative Agent pursuant to Section
9.03(b) hereof shall become effective prior to the date of appointment by AerCo
Group of a successor Administrative Agent and the acceptance of such appointment
by such successor Administrative Agent; provided, however, that in the event
that a successor Administrative Agent shall not have been appointed within 90
days after the date upon which this Agreement would otherwise have terminated,
the Administrative Agent may petition any court of competent jurisdiction for
the appointment of a successor Administrative Agent; provided, further, that
AerCo will notify, as soon as practicable, each rating agency then rating the
Notes of the Person which AerCo Group proposes to appoint as successor
Administrative Agent and, if any such rating agency notifies AerCo 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 Administrative
Agent, AerCo Group will not proceed with the appointment of such Person. Upon
action by either party pursuant to the provisions of this Section 9.03(c), the
Administrative Agent shall be entitled to the payment of any compensation owed
to it hereunder and to the reimbursement of all Reimbursable Expenses incurred
in connection with all services rendered by it hereunder, as provided in Section
8 hereof, and for so long as the Administrative Agent is continuing to perform
any of the Administrative Services for any Person within AerCo Group, the
Administrative Agent 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 Administrative



                                       36
<PAGE>   42

Agent to AerCo Group or not to be due to the Administrative Agent, until a
successor Administrative Agent shall have been appointed and shall have
accepted such appointment in accordance with the provisions of Section 9.04(c)
hereof.

          (d) The parties hereto agree not to amend this Agreement to reduce the
scope of the Administrative Services to be provided by the Administrative Agent
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
Administrative Services in the place of the Administrative Agent.

         SECTION 9.04.  Consequences of Termination.  (a) Notices. (i) Following
the termination of this Agreement pursuant to Section 9.02 hereof or by AerCo
Group or by the Administrative Agent pursuant to Section 9.03 hereof, the
Administrative Agent will promptly forward to AerCo Group any notices received
by it during the year immediately after termination.

              (ii) AerCo Group will notify promptly any relevant third party,
         including each Rating Agency, the Trustee, the Cash Manager and the
         Servicer, of the termination of this Agreement by AerCo Group or by the
         Administrative Agent and will request that any such notices and
         accounting reports and communications thereafter be made or given
         directly to the entity engaged to serve as Administrative Agent, and to
         AerCo Group.

          (b) Accrued Rights. A termination of this Agreement by AerCo Group or
by the Administrative Agent hereunder shall not affect the respective rights and
liabilities of any party accrued prior to such termination in respect of any
prior breaches hereof or otherwise.

          (c) Replacement. If this Agreement is terminated under Section 9.02
hereof or by the Administrative Agent or AerCo Group under Section 9.03 hereof,
the Administrative Agent will cooperate with any person appointed to perform the
Administrative Services, including providing such person with all information
and documents reasonably requested.

         SECTION 9.05. Survival. Notwithstanding any termination or the
expiration of this Agreement, the obligations of AerCo Group and the
Administrative Agent under Section 3.02, Section 8.01 (to the extent any fees
due and owing through such date of termination remain unpaid) and Section 9.03
hereof, shall survive such termination or expiration, as the case may be.


                                   ARTICLE 10


                                       37
<PAGE>   43
                            ASSIGNMENT AND DELEGATION

         SECTION 10.01. Assignment and Delegation. (a) No party to this
Agreement shall assign or delegate or otherwise subcontract this Agreement or
all or any part of its rights or obligations hereunder to any Person without the
prior written consent of the other parties, such consent not to be unreasonably
withheld.

          (b) Without limiting the foregoing, any Person who shall become a
successor by assignment or otherwise of any party hereto shall be required as a
condition to the effectiveness of any such assignment or other arrangement 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 Administrative Agent of all agreements, covenants
and other obligations required to be performed by the Administrative Agent
hereunder or under any other Related Document (including, without limitation,
the punctual payment when due of all amounts now or hereafter payable by the
Administrative Agent 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.

         The Guarantor hereby waives diligence, presentment, filing of claims
with a court in the event of merger or bankruptcy of the Administrative Agent,
any right to require a proceeding first against the Administrative Agent, 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

                                       38
<PAGE>   44
 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 Administrative Agent 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 Administrative Agent, 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 Administrative Agent,
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 Administrative Agent 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 Administrative Agent upon the bankruptcy or insolvency of the
Administrative Agent 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 Administrative Agent, the absence of any action to enforce the
Administrative Agent'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 Administrative Agent or any circumstance which
might otherwise constitute a legal or equitable discharge of

                                       39
<PAGE>   45
 defense of a guarantor; provided, however, that the Guarantor shall be entitled
to exercise any right that the Administrative Agent 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 Administrative Agent hereunder or under any other
Related Document.


                                   ARTICLE 12

                                  MISCELLANEOUS

         SECTION 12.01. Notices. Subject to paragraph (d) below, all notices,
consents, directions, approvals, instructions, requests and other communications
required or permitted by such 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 (with a copy to the Administrative Agent):

         If to the Administrative Agent, to:

         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
         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


                                       40
<PAGE>   46

         Facsimile:        31-20-6559-100

         If to AerCo or its Subsidiaries, to:

         AerCo Limited
         22 Grenville Street
         St. Helier
         Jersey JE4 8PX, Channel Islands
         Attention:        Mourant & Co. Secretaries Limited,
                           Company Secretary
         Telephone:        44-1534-609-000
         Facsimile:        44-1534-609-333

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

         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 such agreement may designate a new
address or number for purposes of notice 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 law 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



                                       41
<PAGE>   47

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 Administrative Agent.

         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 where 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. Power of Attorney. Each of AerCo and the Subsidiaries
shall appoint the Administrative Agent and its successors, and its permitted
designees and assigns, as their true and lawful attorney-in-fact. All services
to be

                                       42
<PAGE>   48
performed and actions to be taken by the Administrative Agent pursuant to this
Agreement shall be performed to and on behalf of each of AerCo and the
Subsidiaries. The Administrative Agent shall be entitled to seek and obtain from
each of AerCo and the Subsidiaries a power of attorney in respect of the
execution of any specific action as the Administrative Agent deems appropriate.

         SECTION 12.09.  Restrictions on Disclosure.  The Administrative Agent
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 Administrative Agent 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 Administrative Agent or an affiliate
thereof is a party, or (ii) reasonably necessary in order to enable the
Administrative Agent to perform the Administrative Agent Services, but in the
case of clause (i) above, in the event of proposed disclosure, the
Administrative Agent 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
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 any Person within AerCo
          Group;

              (iii) was disclosed to the general public with the approval of any
          Person within AerCo Group; or

                                       43
<PAGE>   49

                (iv) was developed independently by the Administrative Agent or
         any Affiliates of the Administrative Agent; and

          (e) to the extent the Administrative Agent reasonably deems necessary
to protect and enforce its rights and remedies under this Agreement; provided,
however, that in such an event the Administrative Agent 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
Administrative Agent shall inform AerCo of such disclosure.

         SECTION 12.10. Rights of Setoff. To the extent permitted by Applicable
Law, the Administrative Agent hereby waives any right it may have under
Applicable Law to exercise any rights of setoff it has under Applicable Law with
respect to any assets it holds owned by, or money or monies it owns to, any
Person within AerCo Group pursuant to and in accordance with the terms and
conditions of this Agreement; provided, however, that this Section 12.10 shall
not affect any rights of setoff or other rights that the Administrative Agent
has or may have under the express terms and conditions of this Agreement.

         SECTION 12.11. 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 Administrative Agent on the other part. It is also
expressly understood that any actions taken on behalf of any AerCo Group member
by the Administrative Agent shall be taken as agent for AerCo Group, either
naming the relevant AerCo Group entity, or naming the Administrative Agent as
agent for an undisclosed principal. No AerCo Group member shall hold itself out
as a partner of the Administrative Agent, and the Administrative Agent will not
hold itself out as a partner of any AerCo Group member.

          (b) The Administrative Agent 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.

         SECTION 12.12.  Implied Terms Excluded.  For the avoidance of doubt,
the provisions of Section 39 of the Sale of Goods and Supply of Services Act,
1980 of Ireland are hereby expressly excluded.

         SECTION 12.13. Table of Contents; Headings. The table of contents and
headings of the various articles, sections and other subdivisions of this
Agreement are for convenience and reference only and shall not modify, define or
limit any of the terms or provisions of this Agreement.


                                       44
<PAGE>   50



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


                                    DEBIS AIRCRAFT LEASING LIMITED,
                                    as Administrative Agent


                                    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:




                                       45
<PAGE>   51

                                    AERCO IRELAND LIMITED


                                    By: ___________________________________
                                        Name:
                                        Title:


                                    AERCO IRELAND II LIMITED


                                    By: ___________________________________
                                        Name:
                                        Title:


                                    AERFI BELGIUM N.V.


                                    By: ___________________________________
                                        Name:
                                        Title:


                                    AERCOUSA INC.


                                    By: ___________________________________
                                        Name:
                                        Title:


                                    AIRCRAFT LEASE PORTFOLIO
                                    SECURITIZATION 94-1 LIMITED


                                    By: ___________________________________
                                        Name:

                                   46

<PAGE>   52

                                        Title:









                                    ALPS 94-1 (BELGIUM) N.V.


                                    By: ___________________________________
                                        Name:
                                        Title:


                                    PERGOLA LIMITED


                                    By: ___________________________________
                                        Name:
                                        Title:






                                       47
<PAGE>   53



                                   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



                                       A-1

<PAGE>   54



                                   APPENDIX B

                           FORM OF ACCESSION AGREEMENT


                                            [DATE]


         We refer to the Administrative Agency Agreement dated as of July 17,
2000, among debis Aircraft Leasing Limited, debis AirFinance B.V., as Guarantor,
AerCo Limited, debis Aircraft Leasing Limited, as Servicer, 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
"ADMINISTRATIVE AGENCY AGREEMENT").

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


                                       B-1

<PAGE>   55


ACCEPTED AND ACKNOWLEDGED:

DEBIS AIRCRAFT LEASING LIMITED,
as Administrative Agent


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:



                                       B-2