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                                CREDIT AGREEMENT



                                   $15,000,000




                                     between


                        WILLIS LEASE FINANCE CORPORATION


                                       and


                              CORESTATES BANK, N.A.




                                      dated

                                  June 12, 1997




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                                Table of Contents



1. Certain Definitions........................................................1
         1.1.     Definitions.................................................1
         1.2.     Accounting Terms............................................8

2. The Credit.................................................................9
         2.1.     The Loans...................................................9
         2.2.     Standby Letters of Credit..................................10
         2.3.     The Revolving Credit Note..................................10
         2.4.     Funding Procedures.........................................11
                  (a)    Requests for Advance................................11
                  (b)    Irrevocability......................................11
                  (c)    Availability of Funds...............................11
         2.5.     Interest...................................................11
         2.6.     Fees.......................................................11
                  (a)    Structuring and Arranging Fee.......................11
                  (b)    Revolving Loan Commitment Fee.......................11
         2.7.     Reduction or Termination of Commitments....................11
                  (a)    Voluntary...........................................11
                  (b)    Revolving Loan Commitment Termination...............12
         2.8.     Voluntary Prepayments......................................12
         2.9.     Payments...................................................12
                  (a)    Accrued Interest....................................12
                  (b)    Form of Payments, Application of Payments, 
                           Payment Administration, Etc.......................12
                  (c)    Demand Deposit Account..............................12
                  (d)    Net Payments........................................12

3.   Representations and Warranties..........................................13
         3.1.     Organization, Standing.....................................13
         3.2.     Corporate Authority, Validity, Etc.........................13
         3.3.     Litigation.................................................13
         3.4.     ERISA......................................................13
         3.5.     Financial Statements.......................................14
         3.6.     Not in Default, Judgments, Etc.............................14
         3.7.     Taxes......................................................14
         3.8.     Permits, Licenses, Etc.....................................14
         3.9.     No Materially Adverse Contracts, Etc.......................14
         3.10.    Compliance with Laws, Etc..................................15
                  (a)    Compliance Generally................................15
                  (b)    Hazardous Wastes, Substances and Petroleum
                           Products..........................................15
         3.11.    Solvency...................................................15
         3.12.    Subsidiaries, Etc..........................................15
         3.13.    Title to Properties, Leases................................15
         3.14.    Public Utility Holding Company; Investment Company.........15

                                       -i-


         3.15.    Margin Stock...............................................16
         3.16.    Use of Proceeds............................................16
         3.17.    Depreciation Policies......................................16
         3.18.    Disclosure Generally.......................................16

4.   Conditions Precedent....................................................16
         4.1.     All Loans..................................................16
                  (a)    Request For Advance.................................16
                  (b)    Borrowing Base Certificate..........................16
                  (c)    Covenants; Representations..........................16
                  (d)    Defaults............................................16
                  (e)    Material Adverse Change.............................16
         4.2.     Conditions to First Loan...................................16
                  (a)    Articles, Bylaws....................................17
                  (b)    Evidence of Authorization...........................17
                  (c)    Legal Opinions......................................17
                  (d)    Incumbency..........................................17
                  (e)    Note................................................17
                  (f)    Documents...........................................17
                  (g)    Consents............................................17
                  (h)    Other Agreements....................................17
                  (i)    Fees, Expenses......................................17

5.   Affirmative Covenants...................................................17
         5.1.     Financial Statements and Reports...........................18
                  (a)    Annual Statements...................................18
                  (b)    Quarterly Statements................................18
                  (c)    No Default..........................................18
                  (d)    ERISA...............................................19
                  (e)    Material Changes....................................19
                  (f)    Other Information...................................19
                  (g)    Borrowing Base Certificates.........................19
                  (h)    Monthly Lease Portfolio and Receivables Report......19
                  (i)    Maintenance of Current Depreciation Policies........19
                  (j)    Monthly Lease Receipts Report.......................19
         5.2.     Corporate Existence........................................19
         5.3.     ERISA......................................................19
         5.4.     Compliance with Regulations................................20
         5.5.     Conduct of Business; Permits and Approvals, 
                    Compliance with Laws.....................................20
         5.6.     Maintenance of Properties..................................20
         5.7.     Ownership..................................................20
         5.8.     Maintenance of Insurance...................................20
         5.9.     Payment of Debt; Payment of Taxes, Etc.....................20
         5.10.    Notice of Events...........................................21
         5.11.    Inspection Rights..........................................21
         5.12.    Generally Accepted Accounting Principles...................21
         5.13.    Compliance with Material Contracts.........................21

                                      -ii-


         5.14.    Use of Proceeds............................................22
         5.15.    Further Assurances.........................................22

6.   Negative Covenants......................................................22
         6.1.     Consolidation and Merger...................................22
         6.2.     Liens......................................................22
         6.3.     Guarantees.................................................22
         6.4.     Margin Stock...............................................22
         6.5.     Acquisitions and Investments...............................22
         6.6.     Transfer of Assets; Nature of Business.....................23
         6.7.     Accounting Change..........................................23
         6.8.     Transactions with Affiliates...............................23
         6.9.     Restriction on Amendment of This Agreement.................23

7.   Financial Covenants.....................................................23
         7.1.     No losses..................................................23
         7.3.     Debt to Tangible Net Worth.................................23
         7.4.     Minimum Interest Expense Coverage..........................23
         7.5.     Borrowing Base.............................................24

8.   Default.................................................................24
         8.1.     Events of Default..........................................24
                  (a)    Payments............................................24
                  (b)    Covenants...........................................24
                  (c)    Representations, Warranties.........................24
                  (d)    Bankruptcy..........................................24
                  (e)    Certain Other Defaults..............................24
                  (f)    Judgments...........................................25
                  (g)    Attachments.........................................25
                  (h)    Change in Control...................................25
                  (i)    Security Interests..................................25

9.   Collateral..............................................................25
         9.1.     Collateral.................................................25
         9.2.     Security Agreement.........................................26
         9.3.     Prepayments and Release of Collateral......................26
                  (a)    Category A Equipment Held For Sale or
                           Subject To Lease..................................26
                  (b)    Category A Equipment Not Subject to Lease;
                           Held for Greater Than Nine Months.................26
                  (c)    Category B(1) Equipment.............................26
                  (d)    Category B(2) Equipment.............................26
                  (e)    Event of Default or Potential Default...............26

10.  Miscellaneous...........................................................26
         10.1.    Waiver.....................................................26
         10.2.    Amendments.................................................27
         10.3.    Governing Law..............................................27

                                     -iii-


         10.4.    Participations and Assignments.............................27
         10.5.    Captions...................................................27
         10.6.    Notices....................................................27
         10.7.    Expenses; Indemnification..................................28
         10.8.    Survival of Warranties and Certain Agreements..............28
         10.9.    Severability...............................................28
         10.10.   No Fiduciary Relationship..................................28
         10.11.   CONSENT TO JURISDICTION AND SERVICE OF PROCESS.............28
         10.12.   WAIVER OF JURY TRIAL.......................................29
         10.13.   Counterparts; Effectiveness................................29
         10.14.   Use of Defined Terms.......................................29
         10.15.   Offsets....................................................29
         10.16.   Entire Agreement...........................................29

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EXHIBIT A         NOTE
EXHIBIT B         BORROWING BASE CERTIFICATE
EXHIBIT C         MORTGAGE AND SECURITY AGREEMENT
EXHIBIT D         COMPLIANCE CERTIFICATE
EXHIBIT E         DEPRECIATION POLICIES

SCHEDULE 1        MISCELLANEOUS INFORMATION


                                      -iv-

 
                                Credit Agreement


         This  Credit  Agreement,  dated  June 12,  1997 (the  "Agreement"),  is
entered  into by and between  WILLIS  LEASE  FINANCE  CORPORATION,  a California
corporation ("Willis") and CORESTATES BANK, N.A., a national banking association
("CoreStates", "CoreStates Bank" or the "Bank").

                              Preliminary Statement

         WHEREAS,  Willis  desires to have  available  to it a revolving  credit
facility  which will be used for the purchase of Equipment  (as defined  herein)
most of which will be held for sale or for lease to unaffiliated  persons,  said
Equipment and related  leases to constitute  part of the  Collateral (as defined
herein).

         WHEREAS,  CoreStates Bank is willing to establish such revolving credit
facility and make loans to Willis under the terms and conditions hereinafter set
forth.

         NOW,   THEREFORE,   in  consideration  of  the  premises  and  promises
hereinafter  set forth and  intending to be legally  bound  hereby,  the parties
hereto agree as follows:


                             1. Certain Definitions

         1.1.  Definitions

         "Affiliate"  shall mean any Person:  (1) which  directly or  indirectly
         controls,  or is controlled by, or is under common control with Willis;
         (2) which directly or indirectly beneficially owns or holds ten percent
         (10%)  or more of any  class of  voting  stock  of  Willis;  or (3) ten
         percent  (10%) or more of whose  voting  stock of which is  directly or
         indirectly  beneficially  owned or held by Willis.  The term  "control"
         means the possession, directly or indirectly, of the power to direct or
         cause the direction of the management and policies of a Person, whether
         through the ownership of voting securities, by contract, or otherwise.

         "Agreement" shall mean this Credit Agreement, as amended, supplemented,
         modified,  replaced,  substituted for or restated from time to time and
         all exhibits and schedules attached hereto.

         "Borrowing  Base"  shall  mean  85% of  Willis's  acquisition  cost  of
         Equipment included in the Collateral,  provided,  however, that on June
         30 and  December  31 of each year a review of the  Collateral  shall be
         made to determine whether the net book value of each piece of Equipment
         has declined by more than 3% from the  acquisition  cost.  In each such
         case  where the net book value has  decreased  by more than 3% from the
         acquisition  cost,  the  Borrowing  Base shall mean 85% of the net book
         value of such  Equipment.  No item of  Category  A  Equipment  shall be
         included  in the  Borrowing  Base  unless  either  (1) it  shall be the
         subject of an Eligible  Lease which is also included in the  Collateral
         or (2) it was  purchased  by Willis for the purpose of sale or lease to
         an  unaffiliated 

                                                                   Dated
Credit Agreement                       - 1 -                       June 12, 1997


         Person and the purchase date is not later than nine months previous. No
         item of Category B(1) Equipment shall be included in the Borrowing Base
         if it was  purchased  by Willis more than nine months prior to the date
         of  determination  of the  Borrowing  Base.  No item of  Category  B(2)
         Equipment  shall be included in the  Borrowing  Base unless it shall be
         the  subject  of an  Eligible  Lease  which  is  also  included  in the
         Collateral.

         "Borrowing Base Certificate"  shall mean a certificate in substantially
         the form  attached  hereto as Exhibit B hereto which shall be signed by
         the chief financial officer or chief executive officer of Willis.

         "Business  Day" shall mean any day other than a  Saturday,  Sunday,  or
         other day on which  commercial  banks in  Philadelphia or San Francisco
         are authorized or required to close under the laws of the  Commonwealth
         of Pennsylvania.

         "Capitalized  Lease" shall mean all lease obligations of any Person for
         any  property  (whether  real,  personal  or mixed)  which have been or
         should be  capitalized  on the books of the lessee in  accordance  with
         General Accepted Accounting Principles.

         "Capitalized Lease Obligations" with respect to any Person,  shall mean
         the aggregate  amount which, in accordance with GAAP, is required to be
         reported  as a liability  on the  balance  sheet of such Person at such
         time in respect of such  Person's  interest  as lessee  under a Capital
         Lease.

         "Category A Equipment"  shall mean  equipment  purchased by Willis from
         unaffiliated Persons and which is either (1) the subject of an Eligible
         Lease or (2) held for sale or lease to unaffiliated Persons. Category A
         Equipment  shall be composed of Stage III  compliant  jet engines which
         are less than 15 years from the date of  manufacture  and are  suitable
         for use in major  aircraft  manufactured  by The Boeing Co.,  McDonnell
         Douglas Corp. or Airbus Industrie.

         "Category B Equipment"  shall mean  equipment  purchased by Willis from
         unaffiliated  Persons  which is  either  (1)  Stage II or III  aircraft
         acquired for the purpose of salvaging  and/or  retrofitting the engines
         from such  aircraft  (such  aircraft  shall  cease to be  eligible  for
         inclusion in this  Category B(1) upon removal of one or more of its jet
         engines),  or (2) traceable spare parts the purchase price of which was
         in excess of $3,000 in each case,  are the subject of  Eligible  Leases
         and have discrete serial and part numbers or other identifying  numbers
         acceptable to the Bank.

         "Closing Date" shall mean the date closing shall occur.

         "Code"  shall mean the Internal  Revenue Code of 1986,  as amended from
         time to time,  and all rules and  regulations  with respect  thereto in
         effect from time to time.

         "Collateral" shall have the meaning set forth in ss.9.1.

         "Compliance  Certificate" shall mean a certificate in substantially the
         form  attached  hereto as Exhibit D which  shall be signed by the chief
         financial officer, treasurer or controller of Willis.

                                                                   Dated
Credit Agreement                       - 2 -                       June 12, 1997


         "Debt"  shall mean,  as of any date of  determination  with  respect to
         Willis,  without  duplication,  (i) all items which in accordance  with
         GAAP would be included in determining total liabilities as shown on the
         liability  side of a  balance  sheet of  Willis as of the date on which
         Debt is to be determined,  (ii) all indebtedness of others with respect
         to which Willis has become liable by way of a guarantee or  endorsement
         (other  than for  collection  or  deposit  in the  ordinary  course  of
         business),  (iii) all contingent  liabilities of Willis, and (iv) lease
         obligations  that, in conformity  with GAAP,  have been  capitalized on
         Willis's balance sheet.

         "Debt  Service"  shall mean actual  payments of  principal  on Debt and
         Capitalized  Lease  Obligations  (including  any Debt or Capital  Lease
         Obligations  paid from the sale of equipment  during the period),  plus
         interest expense incurred during the period.

         "Default  Rate" on any Loan  shall  mean 2% per  annum  above the Prime
         Rate.

         "Dollars"  shall  mean the  lawful  currency  of the  United  States of
         America.

         "EBIT" shall mean the sum of (i) Net Income, plus (ii) amounts deducted
         for interest and taxes.

         "Eligible  Lease" shall mean a lease for  Equipment to an  unaffiliated
         Person in which (i) Willis or its  trustee is the sole  lessor (ii) the
         lease arose in the  ordinary  course of  business of Willis,  (iii) the
         Equipment has been delivered to the lessee and is currently  subject to
         the lease,  (iv) neither the lease nor the  Equipment is subject to any
         currently  outstanding  assignment,  claim, lien,  security interest or
         other  limitation  on the  absolute  title  of  Willis  or its  trustee
         thereto, (v) the lease payments are not more than 90 days past due with
         respect  to  any  payment  required  thereby  (based  on  the  original
         contractual  term  and not  including  any  amendment  or  modification
         thereof,   unless  the  Bank  has  specifically  consented  thereto  in
         writing),  (vi) the lease is freely  assignable  (with any  notices  or
         consents  required  in  connection  therewith  having  been  previously
         obtained), (vii) the lease is dated and has been in effect for not more
         than 45 days prior to the date the lease was  assigned  to the Bank and
         included  in  the  Collateral  in  the  case  of  leases  entered  into
         subsequent  to the Closing  Date; or the lease was assigned to the Bank
         and included in the Collateral within 45 days immediately following the
         Closing  Date,  in the case of  leases  existing  at the  Closing  Date
         without  regard to the date of the lease;  or the lease was assigned to
         the Bank and  included  in the  Collateral  within 45 days  immediately
         following the date of acquisition of said lease by Willis,  in the case
         of leases purchased from unaffiliated persons, (viii) the lease has not
         been included in the Collateral  for a period of more than  twenty-four
         months,  (ix) the  lease  and the  Equipment  being  leased  constitute
         Collateral,  (x) the remaining  lease term at the time of assignment to
         the Bank is for a period of ten years or less in the case of Category A
         Equipment   and  Category   B(2)   Equipment,   (xi)  the  lease  is  a
         noncancellable, triple net lease in which the lessee may not assert, as
         an offset,  any defenses or claims  against the lessor arising from the
         condition  or the intended  use of the subject  matter),  except in the
         case of leases with terms of less than 6 months in which  Willis may be
         responsible  for maintenance and (xii) the lessee is not a resident of,
         and the  Equipment  will not be used in any,  foreign  jurisdiction  in
         which, in the sole  determination  of the Bank, the ability of the Bank
         to perfect a first  priority  security  interest  in the  Equipment  is
         unsatisfactory  or the  ability  of the  Bank  to  foreclose  upon  the
         Equipment  and  receive   possession  to  or  sell  said  Equipment  is
         unsatisfactory.

                                                                   Dated
Credit Agreement                       - 3 -                       June 12, 1997


         "Environmental  Control  Statutes" shall mean each and every applicable
         federal, state, county or municipal  environmental statute,  ordinance,
         rule, regulation,  order,  directive or requirement,  together with all
         successor statutes, ordinances, rules, regulations,  orders, directives
         or  requirements,  of any  Governmental  Authority,  including  without
         limitation laws in any way related to Hazardous Substances.

         "Equipment" shall mean Category A Equipment and Category B Equipment.

         "ERISA" shall mean the Employee Retirement Income Security Act of 1974,
         as it may be amended from time to time.

         "ERISA  Affiliate" shall mean any corporation  which is a member of the
         same  controlled  group of corporations as Willis within the meaning of
         ss.414(b) of the Code,  or any trade or business  which is under common
         control with Willis within the meaning of ss.414(c) of the Code.

         "Event of Default" shall have the meaning set forth in ss.8.1.

         "Fiscal Quarter" shall mean a fiscal quarter of Willis,  which shall be
         any  quarterly  period  ending on March 31,  June 30,  September  30 or
         December 31 of any year.

         "Fiscal  Year" shall mean a fiscal  year of Willis,  which shall end on
         the last day of December.

         "Generally  Accepted  Accounting   Principles"  or  "GAAP"  shall  mean
         generally accepted accounting principles as in effect from time to time
         in the United States, consistently applied.

         "Governmental  Authority"  shall  mean the  federal,  state,  county or
         municipal  government,  or any  department,  agency,  bureau  or  other
         similar type body obtaining  authority therefrom or created pursuant to
         any laws, including without limitation Environmental Control Statutes.

         "Hazardous  Substances"  shall mean without  limitation,  any regulated
         substance,  toxic  substance,  hazardous  substance,  hazardous  waste,
         pollution,  pollutant or contaminant,  as defined or referred to in the
         Resource Conservation and Recovery Act, as amended, 15 U.S.C.,  ss.2601
         et seg.; the  Comprehensive  Environmental  Response,  Compensation and
         Liability  Act,  33 U.S.C.  ss.1251 et seg.;  the  federal  underground
         storage tank law, Subtitle I of the Resource  Conservation and Recovery
         Act, as amended,  P.L. 98-616, 42 U.S.C. ss.6901 et seg.; together with
         any  amendments  thereto,  regulations  promulgated  thereunder and all
         substitutions  thereof,  as well as words of similar purport or meaning
         referred  to  in  any  other  federal,   state,   county  or  municipal
         environmental statute, ordinance, rule or regulation.

         "Indebtedness  for  Borrowed  Money"  shall mean (i) all  indebtedness,
         liabilities,  and obligations,  now existing or hereafter arising,  for
         money  borrowed  by  Willis,  whether  or not  evidenced  by any  note,
         indenture,  or agreement (including,  without limitation,  the Note and
         any  indebtedness  for money  borrowed from an Affiliate)  and (ii) all
         indebtedness of others for money borrowed (including indebtedness of an
         Affiliate)  with respect to which Willis has become  liable by way of a
         guarantee or indemnity.

                                                                   Dated
Credit Agreement                       - 4 -                       June 12, 1997


         "Intangible  Assets"  shall mean all assets  which  would be classed as
         intangible assets under GAAP consistently applied,  including,  without
         limitation, goodwill (whether representing the excess of cost over book
         value of assets  acquired or  otherwise),  patents,  trademarks,  trade
         names, copyrights, franchises, and deferred charges (including, without
         limitation,  unamortized debt discount and expense, organization costs,
         and research and development  costs).  For purposes of this definition,
         prepayments  of taxes,  license  fees and other  expenses  shall not be
         deemed Intangible Assets.

         "Investment" in any Person shall mean (a) the acquisition  (whether for
         cash, property,  services or securities or otherwise) of capital stock,
         bonds, notes,  debentures,  partnership or other ownership interests or
         other securities of such Person; (b) any deposit with, or advance, loan
         or other  extension  of credit to,  such  Person  (other  than any such
         deposit,  advance,  loan or  extension  of  credit  having  a term  not
         exceeding 90 days in the case of  unaffiliated  Persons and 120 days in
         the case of Affiliates  representing the purchase price of inventory or
         supplies  purchased in the ordinary course of business) or guarantee or
         assumption  of,  or  other  contingent   obligation  with  respect  to,
         Indebtedness for Borrowed Money or other liability of such Person;  and
         (c) (without  duplication  of the amounts  included in (a) and (b)) any
         amount that may, pursuant to the terms of such investment,  be required
         to be paid, deposited,  advanced,  lent or extended to or guaranteed or
         assumed on behalf of such Person.

         "Lien"  shall  mean any  lien,  mortgage,  security  interest,  chattel
         mortgage,  pledge or other encumbrance  (statutory or otherwise) of any
         kind securing satisfaction of an Obligation, including any agreement to
         give  any of the  foregoing,  any  conditional  sales  or  other  title
         retention agreement, any lease in the nature thereof, and the filing of
         or the  agreement  to give any  financing  statement  under the Uniform
         Commercial  Code  of  any  jurisdiction  or  similar  evidence  of  any
         encumbrance, whether within or outside the United States.

         "Loan" or "Loans" shall mean a Revolving Credit Loan or Loans.

         "Loan  Documents"  shall mean this  Agreement,  the Note,  the Security
         Agreement,  and all other documents  directly  related or incidental to
         said documents, the Loans or the Collateral.

         "Material  Adverse Change" shall mean any event or condition  which, in
         the reasonable  determination  of the Bank,  could result in a material
         adverse  change in the  financial  condition,  business,  properties or
         profits of Willis or which gives  reasonable  grounds to conclude  that
         Willis,  may not or will  not be able to  perform  or  observe  (in the
         normal course) its obligations  under the Loan Documents to which it is
         a party, including but not limited to the Note.

         "Material  Adverse Effect" shall mean a material  adverse effect (i) on
         the financial condition,  business,  properties,  or profits of Willis,
         (ii) the  ability  of Willis to  perform  its  obligations  under  this
         Agreement,  the  Note  and the  other  Loan  Documents,  or  (iii)  the
         legality,  validity or  enforceability of this Agreement or the Note or
         the rights and remedies of the holders of the Loans.

         "Monthly Lease Portfolio and Receivables Report" shall mean a report in
         summary  form of the status of  accounts  receivable  in respect of all
         leases  which  are  part  of  the  Collateral  in  form  and  substance
         reasonably satisfactory to the Bank.

                                                                   Dated
Credit Agreement                       - 5 -                       June 12, 1997


         "Multiemployer  Plan"  shall  mean a  multiemployer  plan as defined in
         ERISA  ss.4001(a)(3),  which  covers  employees  of Willis or any ERISA
         Affiliate.

         "Net  Income"  shall mean net income after income taxes as shown on the
         balance sheet.

         "Net Worth" shall mean the sum of capital stock,  plus paid-in capital,
         plus retained earnings, minus treasury stock.

         "Note" shall mean the Revolving Credit Note.

         "Obligations"  shall mean all now existing or hereafter  arising debts,
         obligations,  covenants,  and duties of payment or performance of every
         kind, matured or unmatured, direct or contingent,  owing, arising, due,
         or payable to the Bank by or from Willis  arising out of this Agreement
         or  any  other  Loan  Document,   including,  without  limitation,  all
         obligations to repay principal of and interest on the Loans, and to pay
         interest,  fees, costs, charges,  expenses,  professional fees, and all
         sums  chargeable  to Willis or for which Willis is liable as indemnitor
         under the Loan Documents, whether or not evidenced by any note or other
         instrument.

         "PBGC"  shall mean the Pension  Benefit  Guaranty  Corporation  and any
         successor thereto.

         "Pension  Plan"  shall  mean,  at  any  time,  any  Plan  (including  a
         Multiemployer  Plan),  the funding  requirements  of which (under ERISA
         ss.302  or Code  ss.412)  are,  or at any  time  within  the six  years
         immediately  preceding the time in question,  were in whole or in part,
         the responsibility of Willis or any ERISA Affiliate.

         "Permitted   Liens"  shall  mean  (a)  any  Liens  for  current  taxes,
         assessments and other  governmental  charges not yet due and payable or
         being contested in good faith by Willis by appropriate  proceedings and
         for  which  adequate  reserves  have  been  established  by  Willis  as
         reflected  in  Willis's  financial  statements;   (b)  any  mechanic's,
         materialman's,  carrier's, warehousemen's or similar Liens for sums not
         yet due or being  contested  in good  faith by  Willis  by  appropriate
         proceedings  and for which adequate  reserves have been  established by
         Willis as reflected in Willis's  financial  statements;  (c) easements,
         rights-of-way,  restrictions and other similar encumbrances on the real
         property  or  fixtures of Willis  incurred  in the  ordinary  course of
         business which  individually or in the aggregate are not substantial in
         amount and which do not in any case  materially  detract from the value
         or  marketability of the property subject thereto or interfere with the
         ordinary conduct of the business of Willis; (d) Liens (other than Liens
         imposed on any  property  of Willis  pursuant to ERISA or ss.412 of the
         Code)  incurred or deposits  made in the  ordinary  course of business,
         including Liens in connection with workers' compensation,  unemployment
         insurance  and  other  types of  social  security  and  Liens to secure
         performance of tenders, statutory obligations,  surety and appeal bonds
         (in  the  case  of  appeal   bonds  such  Lien  shall  not  secure  any
         reimbursement  or  indemnity  obligation  in  an  amount  greater  than
         $2,500,000),  bids, leases that are not Capitalized Leases, performance
         bonds, sales contracts and other similar obligations, in each case, not
         incurred in connection with the obtaining of credit or the payment of a
         deferred purchase price, and which do not, in the aggregate,  result in
         a Material Adverse Effect;  and (e) Liens, if any, existing on the date
         hereof  and  listed  in  Schedule  1  hereto  other  than  Liens of the
         character  referred  to in clause  (f);  (f) Liens on  specific  assets
         purchased  whether  before or after  the date  hereof  and any  revenue

                                                                   Dated
Credit Agreement                        - 6 -                      June 12, 1997


         stream  directly  attributable  thereto  provided  that such  liens are
         limited to the Equipment so purchased and the revenue stream  generated
         therefrom.

         "Person" shall mean any  individual,  corporation,  partnership,  joint
         venture,  association,  company,  business  trust or  entity,  or other
         entity of whatever nature.

         "Plan"  shall mean an  employee  benefit  plan as defined in ss.3(3) of
         ERISA, other than a Multiemployer  Plan, whether formal or informal and
         whether legally binding or not.

         "Potential Default" shall mean an event, condition or circumstance that
         with the  giving  of notice  or lapse of time or both  would  become an
         Event of Default.

         "Prime Rate" shall mean, for any day, the prime commercial lending rate
         of CoreStates  Bank,  N.A., as announced  from time to time at its head
         office,  calculated  on the  basis of 30 day  months  and a year of 360
         days.

         "Prohibited  Transaction"  shall mean a transaction  that is prohibited
         under Code ss.4975 or ERISA ss.406 and not exempt under Code ss.4975 or
         ERISA ss.408.

         "Regulation" shall mean any statute, law, ordinance,  regulation, order
         or rule of any United States or foreign, federal, state, local or other
         government or governmental body, including,  without limitation,  those
         covering or related to  banking,  financial  transactions,  securities,
         public  utilities,   environmental  control,  energy,  safety,  health,
         transportation,  bribery, record keeping,  zoning,  antidiscrimination,
         antitrust,  wages  and  hours,  employee  benefits,  and price and wage
         control matters.

         "Release"  shall  mean  without  limitation,  the  presence,   leaking,
         leaching, pouring, emptying, discharging,  spilling, using, generating,
         manufacturing,   refining,   transporting,   treating,  or  storing  of
         Hazardous  Substances at, into, onto, from or about the property or the
         threat  thereof,  regardless of whether the result of an intentional or
         unintentional  action  or  omission,  and  which  is  in  violation  of
         applicable law.

         "Reportable  Event" shall mean, with respect to a Pension Plan: (a) Any
         of the  events  set  forth  in ERISA  Sections  4043(b)  (other  than a
         reportable  event as to which the  provision  of 30 days' notice to the
         PBGC  is  waived  under  applicable  regulations)  or  4063(a)  or  the
         regulations thereunder,  (b) an event requiring any Willis or any ERISA
         Affiliate   to  provide   security   to  a  Pension   Plan  under  Code
         ss.401(a)(29)  and (c) any failure by any Willis or any ERISA Affiliate
         to make payments required by Code ss.412(m).

         "Revolver Termination Date" shall meaning set forth in ss.2.1.

         "Revolving Credit Loan" shall have the meaning set forth in ss.2.1.

         "Revolving Credit Note" shall have the meaning set for in ss.2.2.

         "Revolving Loan Commitment" shall have the meaning set forth in ss.2.1.

                                                                   Dated
Credit Agreement                        - 7 -                      June 12, 1997


         "Revolving  Loan  Commitment  Fee" shall have the  meaning set forth in
         ss.2.5.(b).

         "Security  Agreement" shall mean the Mortgage and Security Agreement in
         the form and substance attached hereto as Exhibit C.

         "Solvent"  shall mean,  with respect to any Person,  that the aggregate
         present fair saleable value of such Person's assets is in excess of the
         total amount of its probable  liabilities on its existing debts as they
         become absolute and matured,  such Person has not incurred debts beyond
         its  foreseeable  ability  to pay such debts as they  mature,  and such
         Person has capital  adequate to conduct  the  business it is  presently
         engaged in or is about to engage in.

         "Standby  Letter of Credit"  shall mean only those  standby  letters of
         credit issued pursuant to a completed application on the form of letter
         of credit  application  required by the Bank at the time of the request
         for each Standby Letter of Credit.

         "Subsidiary"  shall mean a  corporation  or other  entity the shares of
         stock or other equity  interests of which having  ordinary voting power
         (other than stock or other equity  interests  having such power only by
         reason of the  happening of a  contingency)  to elect a majority of the
         board of directors  or other  managers of such  corporation  are at the
         time  owned,  or the  management  of  which  is  otherwise  controlled,
         directly or indirectly  through one or more  intermediaries or both, by
         Willis.

         "Tangible Net Worth" shall mean Net Worth, minus Intangible Assets.

         "Termination  Event" shall mean,  with respect to a Pension Plan: (a) a
         Reportable  Event, (b) the termination of a Pension Plan, or the filing
         of a notice of intent to terminate a Pension  Plan, or the treatment of
         a Pension Plan amendment as a termination under ERISA  ss.4041(c),  (c)
         the  institution of proceedings to terminate a Pension Plan under ERISA
         ss.4042 or (d) the  appointment  of a trustee to administer any Pension
         Plan under ERISA ss.4042.

         "Unfunded Pension  Liabilities" shall mean, with respect to any Pension
         Plan at any time,  the  amount  determined  by taking  the  accumulated
         benefit  obligation,  as  disclosed  in  accordance  with  Statement of
         Accounting Standards No. 87, over the fair market value of Pension Plan
         assets.

         "Unrecognized  Retiree Welfare  Liability"  shall mean, with respect to
         any Plan that  provides  post-retirement  benefits  other than  pension
         benefits,  the  amount  of  the  accumulated   post-retirement  benefit
         obligation,  as determined in  accordance  with  Statement of Financial
         Accounting  Standards  No. 106, as of the most recent  valuation  date.
         Prior to the date such  statement  is  applicable  to any Willis,  such
         amount of the  obligation  shall be based on an  estimate  made in good
         faith.

         1.2 Accounting  Terms. All accounting  terms not  specifically  defined
herein shall be construed  in  accordance  with  Generally  Accepted  Accounting
Principles  consistent  with those applied in the  preparation  of the financial
statements  referred to in ss.3.5,  and all financial data submitted pursuant to
this Agreement shall be prepared in accordance with such principles.

                                                                   Dated
Credit Agreement                       - 8 -                       June 12, 1997


                                  2. The Credit

         2.1. The Loans.  Subject to the terms and  conditions  herein set forth
and in reliance upon the  representations,  warranties  and covenants  contained
herein, CoreStates Bank agrees to make revolving credit loans ("Revolving Credit
Loans") to Willis  upon  receipt of loan  requests  therefor  in amounts  not to
exceed at any time outstanding,  in the aggregate,  $15,000,000 (such amount, as
the same may be reduced pursuant to ss.2.7 hereof being  hereinafter  called the
"Revolving  Loan  Commitment").  For  purposes  of  determining  the  amount  of
Revolving  Credit  Loans  outstanding,  the  Standby  Letters  of Credit  issued
pursuant to ss.2.2  hereof shall be deemed  Revolving  Credit Loans and shall be
added to the  Revolving  Credit Loans  outstanding  to determine  the  aggregate
Revolving Credit Loans  outstanding.  As provided below,  Revolving Credit Loans
may be  requested  by Willis,  and made from time to time prior to the  Revolver
Termination  Date.  All Loans  shall be made to Willis at the main office of the
Bank, Broad and Chestnut Streets, Philadelphia, Pennsylvania 19101.

         Revolving  Credit Loans may be made from time to time during the period
beginning  on the date hereof and ending on June 12, 1998 or on the earlier date
of termination in full,  pursuant to ss.2.7 or ss.8.1 hereof, of the obligations
of the Bank under this ss.2.1 (June 12, 1998 or such earlier date of termination
being herein called the "Revolver Termination Date").  Revolving Credit Loans at
the occasion of each borrowing shall be in aggregate  principal amounts at least
equal to $150,000 or, if less, the remaining unused amount of the Revolving Loan
Commitment.  Willis shall not be entitled to any Revolving Credit Loan if, after
giving effect to such Loan, the unpaid amount of the then outstanding  Revolving
Credit Loans would exceed the then current Borrowing Base. Prior to the Revolver
Termination  Date and within the limits of the Revolving Loan Commitment and the
Borrowing Base, Willis may borrow,  prepay and reborrow  Revolving Credit Loans.
All  Revolving  Credit Loans shall mature and be due and payable as set forth in
the  next  paragraph  of this  ss.2.1  unless  the  maturity  of said  Loans  is
accelerated as provided in ss.2.7 or ss.8.1 hereof.

         At the end of each Agreement Year, Willis may request that the Revolver
Termination  Date be extended for one full year by notifying  CoreStates Bank in
writing  not more  than 90 days nor  less  than 60 days  prior to the end of the
existing Agreement Year that it desires an extension of the Revolver Termination
Date.  If  CoreStates  Bank in its sole  discretion  shall  elect to extend  the
Revolver  Termination  Date for one full year, it shall notify Willis in writing
prior to the end of the existing Agreement Year that it is willing to extend the
Revolver  Termination  Date on the terms and  conditions  set forth  herein.  If
CoreStates  Bank shall not issue such written notice,  the Revolver  Termination
Date shall not be deemed  extended.  In the Event that the Revolver  Termination
Date is not extended and provided that the maturity date of the Revolving Credit
Loans has not been  accelerated  as  provided  in ss.2.7 or ss.8.1  hereof,  the
outstanding  principal  balance  of the  Note  shall  be  repaid  in 23  monthly
installments,  each in the amount of the  greater of (i) 1.75% of the  Revolving
Credit Loans  outstanding  at the Revolver  Termination  Date or (ii) 90% of the
aggregate  lease payments  received in respect of items of Collateral  which are
subject  to lease  during the  specified  month and a final  installment  in the
amount of the unpaid  balance of the Revolving  Credit Loans  outstanding at the
end of the 24th month  following the Revolver  Termination  Date. In addition to
the monthly  payments  described above, if any payment is required to be made in
order to remain in compliance with the Borrowing Base covenant in ss.7.5 herein,
such additional  payment shall reduce the final  installment  only and shall not
have any effect on the 23 monthly installments.  The term "Agreement Year" shall
mean a one  year  period  ending  on the  same  month  and  day as the  Revolver

                                                                   Dated
Credit Agreement                       - 9 -                       June 12, 1997


Termination  Date. The first Agreement Year will expire on the first anniversary
of the date of this Agreement.

         Willis may have Revolving Credit Loans outstanding at any time and from
time to time in an aggregate amount up to, but not exceeding  $5,000,000 for the
acquisition of Category B Equipment. Any item of Category B Equipment which is a
Stage III jet engine shall be deducted from Category B Equipment and become part
of  Category A  Equipment  upon the  physical  removal of that  engine  from its
airframe,  provided  that such  Equipment  otherwise  qualifies  as  Category  A
Equipment.

         2.2.  Standby Letters of Credit.  The Bank, under the terms and subject
to the conditions of this Agreement, agrees to provide Standby Letters of Credit
to  Willis,  from  time to time  prior  to the  Revolver  Termination  Date,  as
requested by Willis,  provided that (A) the aggregate  amount of Standby Letters
of Credit outstanding at any one time shall not exceed $2,000,000 or such lesser
amount,  if any, as will, when added to the amount of the Revolving Credit Loans
then  outstanding,  aggregate  $15,000,000  (or such lesser  amount as Willis is
entitled to borrow  hereunder  at such time by reason of the  limitation  of the
Borrowing Base or otherwise), and (B) no Standby Letter of Credit shall be for a
term longer than one year.

         Willis  shall  request a Standby  Letter  of  Credit  by  delivering  a
completed  letter  of  credit  application  to the  Bank on such  form as may be
specified  by the Bank not  less  than  three  Business  Days  prior to the date
specified  by Willis as the date the  Standby  Letter of Credit is to be issued.
The standard form of  CoreStates'  letter of credit  application as currently in
effect shall be used.

         Standby  Letters of Credit shall not bear interest until drawn upon but
shall each be subject to an annual charge, payable in advance, as such may exist
from time to time,  provided,  however,  that at no time shall the annual charge
for any Standby Letter of Credit exceed 2.75%.

         Any  obligation of Willis to pay money in  connection  with any Standby
Letter of Credit or the application  therefor shall be deemed secured as if made
as a Loan  hereunder.  In the event Willis shall  terminate  the  Commitment  as
provided  in  ss.2.6  and  shall  pay the  outstanding  principal  amount of the
Revolving  Credit Loans in full and with  interest or the  Revolver  Termination
Date shall  occur at a time when one or more  Standby  Letters of Credit  remain
outstanding, then Willis shall furnish to the Bank within two Business Days such
amount of cash, to be held as cash  collateral and invested in  certificates  of
deposit of the Bank with  interest  payable to Willis,  as will pay the  maximum
amount  which  may be  drawn by  beneficiaries  of  Standby  Letters  of  Credit
outstanding at the date of such termination or the Revolver Termination Date, as
applicable.

         2.3. The Revolving  Credit Note. The Revolving Credit Loans made by the
Bank shall be evidenced by a single  promissory note of Willis (such  promissory
note as it may be amended, extended, modified,  restated, replaced,  substituted
for or renewed,  the "Revolving  Credit Note") in principal face amount equal to
the  Bank's  Revolving  Loan  Commitment,  payable  to the order of the Bank and
otherwise in the form attached  hereto as Exhibit A. The  Revolving  Credit Note
shall be dated the Closing  Date,  shall bear interest at the rate per annum and
be payable as to principal  and interest in  accordance  with the terms  hereof.
Each  outstanding  Revolving  Credit  Loan shall be and  payable as set forth in
ss.2.1  hereof unless the maturity of said Loans is  accelerated  as provided in
ss.2.7 or ss.8.1 hereof.  The Bank shall maintain records of all Loans evidenced
by the Revolving Credit Notes and of all payments  thereon,  which records shall
be conclusive absent manifest error

                                                                   Dated
Credit Agreement                       - 10 -                      June 12, 1997


        2.4. Funding Procedures

         (a)  Requests  for  Advance.  Each request for a Loan shall be made not
later than 2:00 p.m.  on a  Business  Day by  delivery  to the Bank of a written
request  signed by Willis or in the  alternative  a telephone  request  followed
promptly by written confirmation of the request, specifying the date, amount and
type of the Loan to be made.  Each  request  shall be received not less than one
Business Day prior to the date of the proposed  borrowing.  No request  shall be
effective until actually received in writing by the Bank. Willis may not request
more than three advances per week.

         (b)  Irrevocability.  Upon  receipt of a request  for a Loan and if the
conditions  precedent  provided  herein  shall be  satisfied at the time of such
request, the request for a Loan shall not be revocable by Willis.

         (c)  Availability of Funds.  In the case of a borrowing,  the Bank will
make funds immediately  available to Willis on the date of each Loan by a credit
to the account of Willis at the Bank's  address set forth  opposite  its name on
the signature page hereof.

        2.5.  Interest.  Each Loan shall bear interest on the  principal  amount
thereof from the date made until such Loan is paid in full,  at a rate per annum
equal to the Prime Rate plus 1/2 of 1%.

        2.6.  Fees.

         (a)  Structuring  and Arranging Fee. Willis agrees to pay to the Bank a
structuring  and  arranging  fee (the  "Fee") in the  amount of 1/2 of 1% of the
Revolving  Loan  Commitment at the time this Agreement is executed and delivered
by both parties.  The $10,000 deposit paid to the Bank by Willis in March,  1997
shall be credited in full to the amount due with respect to the Closing Fee.

         (b) Revolving Loan  Commitment Fee. Willis agrees to pay to the Bank as
compensation  for the Revolving  Loan  Commitment,  a fee (the  "Revolving  Loan
Commitment Fee") computed as follows:  (1) when the average daily balance of the
aggregate Loans  outstanding  under the Revolving Credit Note (measured over the
previous calendar quarter or portion thereof, as applicable) is less than 50% of
the Revolving Loan Commitment,  Willis shall pay a Revolving Loan Commitment Fee
equal to 3/8 of 1% of the unused portion of the Revolving Loan  Commitment,  and
(2) when the average daily balance of the aggregate Loans  outstanding under the
Revolving  Credit Note (measured over the previous  calendar  quarter or portion
thereof, as applicable) is at least 50% of the Revolving Loan Commitment, Willis
shall pay a  Revolving  Loan  Commitment  Fee  equal to 1/4 of 1% of the  unused
portion of the Revolving  Loan  Commitment.  The Revolving  Loan  Commitment Fee
shall be payable in arrears on the first day of each  January,  April,  July and
October,  commencing July 1, 1997 (for the three month period or portion thereof
ended on the preceding  day), and ending on the Revolver  Termination  Date. The
Revolving  Loan  Commitment  Fee shall be  calculated  on the basis of a 360 day
year.

        2.7. Reduction or Termination of Commitments.

         (a)  Voluntary.  Willis may at any time,  on not less than one Business
Days'  written  notice,  terminate  or  permanently  reduce the  Revolving  Loan
Commitment,  provided  that any  reduction  shall be

                                                                   Dated
Credit Agreement                       - 11 -                      June 12, 1997


in the  minimum  amount  of  $150,000  or a  multiple  thereof  and that no such
reduction  shall cause the principal  amount of Loans  outstanding to exceed the
reduced Revolving Loan Commitment.

         (b) Revolving Loan Commitment  Termination.  In the event the Revolving
Loan  Commitment  is  terminated,   the  Revolver   Termination  Date  shall  be
accelerated  to the date of such  termination  and Willis shall,  simultaneously
with such  termination,  repay the  Revolving  Credit Loans in  accordance  with
ss.2.9.

        2.8  Voluntary  Prepayments.  On one Business  Day's notice to the Bank,
Willis may, without penalty, at its option, prepay any Loan in whole at any time
or in part from time to time,  provided that each partial prepayment shall be in
the minimum  principal  amount of $150,000  or, if  greater,  then in  multiples
thereof and, if less than $150,000  shall be  outstanding,  in principal  amount
equal  to  amount   remaining   outstanding.   Notwithstanding   the  foregoing,
prepayments may be made in connection with the release of collateral as provided
in ss.9.3,  which  prepayments  shall not be subject to the  requirements of the
previous sentence.

        2.9. Payments.

         (a) Accured  Interest.  Accrued  interest on all Loans shall be due and
payable on the first  Business Day of each calendar  month and upon the Revolver
Termination Date.

         (b) Form of Payments,  Application of Payments, Payment Administration,
Ect. All payments of principal,  interest,  fees,  or other  amounts  payable by
Willis hereunder shall be remitted to the Bank at the address set forth opposite
its name on the  signature  page hereof or at such office or account as the Bank
shall specify to Willis, in immediately available funds not later than 2:00 p.m.
on the day when due. Whenever any payment is stated as due on a day which is not
a Business  Day,  the  maturity  of such  payment  shall be extended to the next
succeeding  Business  Day and  interest and  commitment  fees shall  continue to
accrue  during such  extension.  Willis  authorizes  the Bank to deduct from any
account of Willis  maintained at the Bank or over which the Bank has control any
amount payable under this  Agreement,  the Note or any other Loan Document which
is not  paid in a timely  manner.  The  Bank's  failure  to  deliver  any  bill,
statement or invoice with respect to amounts due under this Section or under any
Loan Document  shall not affect  Willis's  obligation to pay any  installment of
principal,  interest  or any other  amount  under  this  Agreement  when due and
payable.

         (c) Demand Deposit  Account.  Willis shall maintain at least one demand
deposit account with the Bank for purposes of this Agreement.  Willis authorizes
the Bank to deposit  into said  account  all  amounts to be  advanced  to Willis
hereunder.  Further,  Willis  authorizes  the Bank  (but the Bank  shall  not be
obligated)  to deduct from said  account,  or any other  account  maintained  by
Willis at the Bank, any amount payable hereunder on or after the date upon which
it is due and payable.  Such  authorization  shall include but not be limited to
amounts payable with respect to principal, interest, fees and expenses.

         (d) Net Payments.  All payments  made to the Bank by Willis  hereunder,
under any Note or under any other Loan  Document  will be made  without set off,
counterclaim or other defense.

                                                                   Dated
Credit Agreement                        - 12 -                     June 12, 1997


                        3. Representations and Warranties

         Willis represents and warrants to the Bank that:

        3.1.  Organization,  Standing.  It (i) is a corporation  duly organized,
validly  existing and in good standing under the laws of the jurisdiction of its
incorporation,  (ii) has the corporate power and authority  necessary to own its
assets,  carry on its  business  and  enter  into and  perform  its  obligations
hereunder,  and under each Loan  Document  to which it is a party,  and (iii) is
qualified to do business and is in good standing in each jurisdiction  where the
nature  of  its  business  or the  ownership  of its  properties  requires  such
qualification,  except  where the  failure to be so  qualified  would not have a
Material Adverse Effect.

        3.2. Corporate Authority,  Validity,  Etc. The making and performance of
the Loan Documents to which it is a party are within its power and authority and
have been duly  authorized by all  necessary  corporate  action.  The making and
performance  of the Loan Documents do not and under present law will not require
any consent or approval  not  obtained of any of Willis's  shareholders,  or any
other  person,  do not and under  present law will not  violate  any law,  rule,
regulation order, writ, judgment, injunction, decree, determination or award, do
not violate any provision of its charter or by-laws,  do not and will not result
in any breach of any material  agreement,  lease or  instrument to which it is a
party, by which it is bound or to which any of its assets are or may be subject,
and do not and will not give rise to any Lien upon any of its assets. The number
of shares and classes of the capital stock of Willis and the  ownership  thereof
are  accurately  set forth on  Schedule 1 attached  hereto;  all such shares are
validly issued, fully paid and non-assessable, and the issuance and sale thereof
are in compliance  with all  applicable  federal and state  securities and other
applicable  laws.  Further,  Willis is not in default under any such  agreement,
lease or instrument except to the extent such default  reasonably could not have
a Material Adverse Effect. No  authorizations,  approvals or consents of, and no
filings or  registrations  with,  any  governmental  or regulatory  authority or
agency are necessary for the execution, delivery or performance by Willis of any
Loan  Document  to  which it is a party or for the  validity  or  enforceability
thereof,  except any filings or registrations expressly contemplated by the Loan
Documents.  Each Loan Document, when executed and delivered,  will be the legal,
valid and binding  obligation  of Willis,  enforceable  against it in accordance
with its terms.

        3.3.  Litigation.  Except  as  disclosed  on  Schedule  1,  there are no
actions,  suits or  proceedings  pending or, to Willis's  knowledge,  threatened
against or affecting  Willis or any of its assets  before any court,  government
agency, or other tribunal which if adversely determined  reasonably could have a
Material  Adverse Effect or upon the ability of Willis to perform under the Loan
Documents.  If there is any disclosure on Schedule 1, the status  (including the
tribunal,  the nature of the claim and the amount in  controversy)  of each such
litigation matter as of the date of this Agreement is set forth in Schedule 1.

        3.4. ERISA. (a) Willis and each ERISA Affiliate are in compliance in all
material  respects with all applicable  provisions of ERISA and the  regulations
promulgated  thereunder;  and, neither Willis, nor any ERISA Affiliate maintains
or contributes to or has maintained or contributed to any multiemployer plan (as
defined in ss.4001 of ERISA)  under which  Willis or any ERISA  Affiliate  could
have any  withdrawal  liability;  (b)  neither  Willis nor any ERISA  Affiliate,
sponsors  or  maintains  any Plan under which  there is an  accumulated  funding
deficiency within the meaning of ss.412 of the Code,  whether or not waived; (c)
the aggregate  liability for accrued benefits and other ancillary benefits under
each  Plan that is or will be  sponsored  or  maintained  by Willis or any ERISA
Affiliate (determined on the basis of the actuarial

                                                                   Dated
Credit Agreement                       - 13 -                      June 12, 1997


assumptions  prescribed for valuing benefits under  terminating  single-employer
defined  benefit  plans under  Title IV of ERISA) does not exceed the  aggregate
fair market value of the assets under each such defined  benefit  pension  Plan;
(d) the aggregate liability of Willis and each ERISA Affiliate arising out of or
relating to a failure of any Plan to comply with the  provisions of ERISA or the
Code, will not have a Material Adverse Effect;  and (e) there does not exist any
unfunded liability (determined on the basis of actuarial assumptions utilized by
the actuary for the plan in preparing the most recent  Annual  Report) of Willis
or any  ERISA  Affiliate  under  any  plan,  program  or  arrangement  providing
post-retirement life or health benefits.

        3.5.  Financial  Statements.  The consolidated  financial  statements of
Willis as of and for the Fiscal Years ending  December 31, 1996 and December 31,
1995,  consisting of a balance sheet, a statement of operations,  a statement of
shareholders' equity, a statement of cash flows and accompanying footnotes,  and
the interim consolidated and consolidating  financial statements of Willis as of
March 31, 1997 furnished to the Bank in connection herewith,  present fairly, in
all  material  respects,  the  financial  position,  results of  operations  and
operating  statistics Willis as of the dates and for the periods referred to, in
conformity  with GAAP.  Except as set forth on  Schedule 1 hereto,  there are no
liabilities,  fixed or  contingent,  which are not  reflected in such  financial
statements,  other than  liabilities  which are not  required to be reflected in
such balance sheets.

        3.6.  Not in Default,  Judgments,  Etc. No Event of Default or Potential
Default  under any Loan  Document  has occurred  and is  continuing.  Willis has
satisfied  all  judgments  and is not in default with  respect to any  judgment,
writ,  injunction,  decree,  rule, or regulation  of any court,  arbitrator,  or
federal, state, municipal,  or other governmental authority,  commission,  board
bureau, agency, or instrumentality, domestic or foreign.

        3.7 Taxes.  Willis has filed all federal,  state,  local and foreign tax
returns  and  reports  which it is  required  by law to file and as to which its
failure to file would have a Material  Adverse  Effect,  and has paid all taxes,
including wage taxes,  assessments,  withholdings and other governmental charges
which are  presently due and payable,  other than those being  contested in good
faith by appropriate  proceedings,  if any, and disclosed on Schedule 1. The tax
charges,  accruals  and  reserves on the books of Willis are adequate to pay all
such taxes that have accrued but are not presently due and payable.

        3.8.  Permits,  Licenses,  Etc. Willis possesses all permits,  licenses,
franchises,  trademarks,  trade names,  copyrights and patents  necessary to the
conduct of its  business as presently  conducted or as presently  proposed to be
conducted,  except  where  the  failure  to  possess  the same  would not have a
Material Adverse Effect.

        3.9. No Materially Adverse Contracts, Etc. To the best of its knowledge,
Willis is not subject to any charter,  corporate or other legal restriction,  or
any judgment,  decree,  order,  rule or regulation  which in the judgment of its
directors  or officers  has or is  expected  in the future to have a  materially
adverse  effect on its  operations,  business,  assets,  liabilities or upon its
ability  to  perform  under  the Loan  Documents.  Willis  is not a party to any
contract or agreement  which in the judgment of its directors or officers has or
is expected to have any  materially  adverse  effect on its business,  except as
otherwise reflected in adequate reserves.

                                                                   Dated
Credit Agreement                       - 14 -                      June 12, 1997


         3.10.  Compliance with Laws, Etc.

         (a)  Compliance  Generally.  Willis is in  compliance  in all  material
respects with all Regulations  applicable to its business  (including  obtaining
all authorizations,  consents, approvals, orders, licenses, exemptions from, and
making  all  filings  or  registrations  or  qualifications  with,  any court or
governmental department,  public body or authority,  commission,  board, bureau,
agency, or instrumentality),  the noncompliance with which reasonably could have
a Material Adverse Effect.

         (b)  Hazardous  Wastes,   Substances  and  Petroleum  Products.  Willis
received  all  permits  and filed all  notifications  necessary  to carry on its
business;  and is in compliance in all respects with all  Environmental  Control
Statutes.  Willis has not given any written or oral notice, nor has it failed to
give required  notice,  to the  Environmental  Protection  Agency ("EPA") or any
state or local agency with regard to any actual or imminently threatened Release
of Hazardous Substances on properties owned, leased or operated by it or used in
connection  with the  conduct of its  business  and  operations.  Willis has not
received  notice  that it is  potentially  responsible  for costs of clean-up or
remediation  of  any  actual  or  imminently  threatened  Release  of  Hazardous
Substances pursuant to any Environmental Control Statute. No real property owned
or leased  by it is in  violation  of any  Environmental  Laws and no  Hazardous
Substances  are present on said real  property in violation of  applicable  law.
Willis has not been identified in any litigation,  administrative proceedings or
investigation  as a potentially  responsible  party for any liability  under any
Environmental Laws.

        3.11.  Solvency.  Willis is, and after giving effect to the transactions
contemplated hereby, will be, Solvent.

        3.12. Subsidiaries,  Etc. Willis does not have any Subsidiaries,  except
as set forth In Schedule 1 hereto.  Set forth in Schedule 1 hereto is a complete
and correct list, as of the date of this Agreement,  of all Investments  held by
Willis in any joint venture or other Person.

        3.13. Title to Properties,  Leases. Willis has good and marketable title
to all assets and  properties  reflected  as being owned by it in its  financial
statements  as well as to all assets  and  properties  acquired  since said date
(except  property  disposed  of  since  said  date  in the  ordinary  course  of
business).  Except  for the Liens set forth in  Schedule  1 hereto and any other
Permitted Liens, there are no Liens on any of such assets or properties.  It has
the right to, and does,  enjoy  peaceful and  undisturbed  possession  under all
material leases under which it is leasing property as a lessee.  All such leases
are valid,  subsisting and in full force and effect,  and none of such leases is
in default,  except where such default, either individually or in the aggregate,
could not have a Material Adverse Effect.

        3.14. Public Utility Holding Company;  Investment Company. Willis is not
a "public utility company" or a "holding company",  or a "subsidiary company" of
a  "holding  company",  or  an  "affiliate"  of  a  "holding  company"  or  of a
"subsidiary  company" of a "holding  company",  as such terms are defined in the
Public Utility  Holding Company Act of 1935, as amended;  or a "public  utility"
within the meaning of the Federal Power Act, as amended.  Further,  it is not an
"investment  company" or an "affiliated person" of an "investment  company" or a
company "controlled" by an "investment company" as such terms are defined in the
Investment Company Act of 1940, as amended.

                                                                   Dated
Credit Agreement                       - 15 -                      June 12, 1997


        3.15. Margin Stock. Willis is not and will not be engaged principally or
as one of its important  activities in the business of extending  credit for the
purpose of  purchasing  or  carrying  or trading in any margin  stocks or margin
securities  (within the meaning of Regulation U of the Board of Governors of the
Federal  Reserve  System as amended  from time to time).  Neither will it use or
permit any proceeds of the Loans to be used, either directly or indirectly,  for
the purpose,  whether immediate,  incidental or ultimate,  of buying or carrying
margin stocks or margin securities.

        3.16.  Use of  Proceeds.  Willis will use the proceeds of any Loan to be
made pursuant hereto for the purchase of Equipment as contemplated herein.

        3.17.  Depreciation Policies.  Willis's depreciation policies are as set
forth on Exhibit E. These  policies  have been in effect  without  change  since
January 1, 1997.

        3.18. Disclosure  Generally.  The representations and statements made by
Willis or on its behalf in connection  with this credit  facility and the Loans,
including  representations and statements in each of the Loan Documents,  do not
and will not contain any untrue  statement of a material fact or omit to state a
material  fact or any  fact  necessary  to make  the  representations  made  not
materially  misleading.  No written information,  exhibit,  report,  brochure or
financial  statement  furnished  by Willis to the Bank in  connection  with this
credit  facility,  the Loans, or any Loan Document  contains or will contain any
material  misstatement  of fact or omit to  state a  material  fact or any  fact
necessary to make the statements contained therein not misleading.

                             4. Conditions Precedent

        4.1.  All  Loans.  The  obligation  of the  Bank  to  make  any  Loan is
conditioned upon the following:

         (a) Request For Advance. Willis shall have delivered and the Bank shall
have  received a Request for  Advance in such form as the Bank may request  from
time to time.

         (b) Borrowing  Base  Certificate.  Willis shall have  delivered and the
Bank shall have received a Borrowing Base Certificate dated the date of the Loan
Requested under this Agreement.

         (c) Covenants;  Representation.  Willis shall be in compliance with all
covenants,   agreements   and   conditions   in  each  Loan  Document  and  each
representation  and warranty  contained in each Loan Document shall be true with
the same effect as if such  representation or warranty had been made on the date
such Loan is made or issued.

         (d)  Defaults.  Immediately  prior to and after  giving  effect to such
transaction, no Event of Default or Potential Default shall exist.

         (e) Material Adverse Change. Since March 31, 1997, there shall not have
been any Material Adverse Change with respect to Willis.

        4.2.  Conditions  to First Loan.  In addition to the  conditions  to all
Loans as provided in ss.4.1,  the  obligation of the Bank to make the first Loan
is conditioned upon the following:

                                                                   Dated
Credit Agreement                       - 16 -                      June 12, 1997


         (a)  Articles,  Bylaws.  The Bank  shall  have  received  copies of the
Articles or Certificate of  Incorporation  and Bylaws of Willis certified by its
Secretary or Assistant  Secretary;  together with  Certificate  of Good Standing
from any  jurisdiction  where the nature of its business or the ownership of its
properties  requires  such  qualification  except  where  the  failure  to be so
qualified would not have a Material Adverse Effect.

         (b)  Evidence of  Authorization.  The Bank shall have  received  copies
certified by the Secretary or Assistant Secretary of Willis or other appropriate
official (in the case of a Person  other than Willis) of all  corporate or other
action  taken  by each  Person  other  than  the Bank who is a party to any Loan
Document to authorize  its execution  and delivery and  performance  of the Loan
Documents and to authorize the Loans, together with such other related papers as
the Bank shall reasonably require.

         (c) Legal  Opinions.  The Bank shall have received a favorable  written
opinions  in form and  substance  satisfactory  to the Bank from  John  Votruba,
Counsel  of Willis,  and McAfee & Taft,  P.C.,  or other  reasonably  acceptable
counsel  which shall be addressed to the Bank and be dated the date of the first
Loan.

         (d)  Incumbency.  The Bank shall have received a certificate  signed by
the secretary or assistant secretary of Willis, together with the true signature
of the officer or officers  authorized to execute and deliver the Loan Documents
and  certificates  thereunder,  upon  which the Bank shall be  entitled  to rely
conclusively until it shall have received a further certificate of the secretary
or assistant  secretary of Willis amending the prior  certificate and submitting
the signature of the officer or officers  named in the new  certificate as being
authorized to execute and deliver Loan Documents and certificates thereunder.

         (e) Note.  The Bank shall have received the Revolving  Credit Note duly
executed, completed and issued in accordance herewith.

         (f)  Documents.   The  Bank  shall  have  received  all   certificates,
instruments  and other  documents then required to be delivered  pursuant to any
Loan Documents,  in each instance in form and substance reasonably  satisfactory
to it.

         (g)  Consents.   Willis  shall  have  provided  to  the  Bank  evidence
satisfactory to it that all  governmental,  shareholder and third party consents
and approvals necessary in connection with the transactions  contemplated hereby
have been obtained and remain in effect.

         (h) Other  Agreements.  Willis shall have executed and  delivered  each
other Loan Document required hereunder.

         (i) Fees, Expenses.  Willis shall simultaneously pay or shall have paid
all fees and expenses due hereunder or any other Loan Document.

                            5. Affirmative Covenants

         Willis covenants and agrees that,  without the prior written consent of
the Bank,  from and after the date hereof and so long as any Obligation  remains
unpaid or outstanding, it will:

                                                                   Dated
Credit Agreement                       - 17 -                      June 12, 1997


        5.1. Financial Statements and Reports. Furnish to the Bank the following
financial information:

         (a) Annual Statements.  No later than one hundred and twenty (120) days
after the end of each Fiscal Year, the  consolidated and  consolidating  balance
sheet of Willis as of the end of such  year and the  prior  year in  comparative
form, and related statements of operations, shareholders' equity, and cash flows
for the Fiscal Year and the prior Fiscal Year in comparative form. The financial
statements shall be in reasonable  detail with appropriate notes and be prepared
in accordance with GAAP. The consolidated  annual financial  statements shall be
certified  (without any  qualification or exception) by KPMG Peat Marwick LLP or
other independent  public  accountants  reasonably  acceptable to the Bank. Such
financial  statements  shall  be  accompanied  by a report  of such  independent
certified public  accountants  stating that, in the opinion of such accountants,
such  financial  statements  present  fairly,  in  all  material  respects,  the
financial  position,  and the results of operations and the cash flows of Willis
for the period then ended in conformity  with GAAP,  except for  inconsistencies
resulting  from changes in accounting  principles  and methods agreed to by such
accountants  and  specified  in  such  report,  and  that,  in the  case of such
financial  statements,  the  examination  by such  accountants of such financial
statements  has  been  made  in  accordance  with  generally  accepted  auditing
standards  and  accordingly  included  examining,  on  a  test  basis,  evidence
supporting the amounts and disclosures in the financial statements and assessing
the  accounting  principles  used and  significant  estimates  made,  as well as
evaluating  the  overall  financial  statement   presentation.   Each  financial
statement  provided  under  this  subsection  (a)  shall  be  accompanied  by  a
certificate  signed by such accountants either stating that during the course of
their  examination  nothing  came to their  attention  which would cause them to
believe that any event has occurred and is continuing which constitutes an Event
of Default or Potential  Default,  or describing each such event. In addition to
the annual financial  statements,  Willis shall,  promptly upon receipt thereof,
furnish  to the  Bank a copy of each  other  report  submitted  to its  board of
directors by its independent  accountants in connection with any annual, interim
or special audit made by them of the financial records of Willis.

         (b) Quarterly  Statements.  No later than forty-five (45) calendar days
after the end of each Fiscal Quarter of each Fiscal Year, the  consolidated  and
consolidating balance sheet and related statements of operations,  shareholders'
equity  and cash flows of Willis  for such  quarterly  period and for the period
from the  beginning of such fiscal year to the end of such Fiscal  Quarter and a
corresponding  financial  statement for the same periods in the preceding Fiscal
Year certified by the chief financial  officer of Willis as having been prepared
in accordance  with GAAP (subject to changes  resulting from audits and year-end
adjustments);  provided,  however,  that  if the  independent  certified  public
accountants  issue a review  report on the  quarterly  financial  statements  of
Willis,  the  financial  statements  required  by this  subsection  (b) shall be
accompanied  by a certificate  signed by such  accountants  either  stating that
during the course of their  examination  nothing came to their  attention  which
would cause them to believe that any event has occurred and is continuing  which
constitutes an Event of Default or Potential  Default,  or describing  each such
event and the remedial  steps being taken by Willis.  Such  quarterly  statement
shall be accompanied by a Compliance  Certificate in the form attached hereto as
Exhibit D or such other form as the Bank shall reasonably request.

         (c) No Default.  Within  forty-five (45) calendar days after the end of
each of the first  three  Fiscal  Quarters  of each  Fiscal  Year and within one
hundred and twenty  (120)  calendar  days after the end of each Fiscal  Year,  a
certificate  signed by the chief financial officer of Willis certifying that, to
the best of such  officer's  knowledge,  after due inquiry,  (i) Willis each has
complied with all covenants, agreements and conditions in each Loan Document and
that each  representation  and warranty  contained in each Loan

                                                                   Dated
Credit Agreement                       - 18 -                      June 12, 1997


Document  is true  and  correct  with  the  same  effect  as  though  each  such
representation  and  warranty  had  been  made on the  date of such  certificate
(except to the extent  such  representation  or  warranty  related to a specific
prior date), and (ii) no event has occurred and is continuing which  constitutes
an Event of Default or Potential Default,  or describing each such event and the
remedial steps being taken by Willis, as applicable.

         (d) ERISA.  All  reports  and forms  filed  with  respect to all Plans,
except as filed in the normal course of business and that would not result in an
adverse action to be taken under ERISA, and details of related  information of a
Reportable Event, promptly following each filing.

         (e)  Material  Changes.  Notification  to the  Bank of any  litigation,
administrative  proceeding,  investigation,  business development,  or change in
financial  condition  which could  reasonably  have a Material  Adverse  Effect,
promptly following its discovery.

         (f) Other Information.  Promptly, upon request by the Bank from time to
time (which may be on a monthly or other basis), Willis shall provide such other
information and reports regarding its operations,  business  affairs,  prospects
and financial condition as the Bank may reasonably request.

         (g)  Borrowing  Base  Certificates.  In the event Willis shall not have
delivered a Borrowing Base  Certificate to the Bank during an calendar month, it
will deliver to the Bank,  no later than 15 days after the end of such  calendar
month as of the last day of the  preceding  calendar  month,  a  Borrowing  Base
Certificate  signed by the chief financial  officer,  treasurer or controller of
Willis.

         (h)  Monthly  Lease  Portfolio  and  Receivables  Report.  As  soon  as
practicable  and in any  event  within 15 days  after  the end of each  calendar
month,  Willis  will  deliver to the Bank a lease  portfolio  listing  and lease
receivables  aging  report (in form and  substance  reasonably  satisfactory  to
CoreStates).

         (i) Maintenance of Current Depreciation Policies. Willis shall maintain
its  method  of  depreciating  its  assets  substantially  consistent  with past
practices  as set forth in  Exhibit E and will  promptly  notify the Bank of any
deviation from such practices.

         (j) Monthly Lease Receipts Report. Within 15 days after the end of each
calendar  month  following the Revolver  Termination  Date and until the Note is
paid in full,  Willis shall deliver to the Bank a report setting forth the items
of  Collateral  on lease and amounts  received with respect to each such item of
Collateral.

        5.2.  Corporate  Existence.  Preserve its  corporate  existence  and all
material franchises,  licenses, patents, copyrights,  trademarks and trade names
consistent with good business practice; and maintain,  keep, and preserve all of
its properties  (tangible and intangible)  necessary or useful in the conduct of
its  business  in good  working  order  and  condition,  ordinary  wear and tear
expected.

        5.3. ERISA. Comply in all material respects with the provisions of ERISA
to the extent  applicable to any Plan  maintained for the employees of Willis or
any ERISA  Affiliate;  do or cause to be done all such acts and things  that are
required to maintain the qualified  status of each Plan and tax exempt status of
each trust forming part of such Plan; not incur any material accumulated funding
deficiency  (within  the  meaning  of  ERISA  and  the  regulations  promulgated
thereunder),  or any material  liability to the PBGC (as

                                                                   Dated
Credit Agreement                       - 19 -                      June 12, 1997


established by ERISA);  not permit any event to occur as described in ss.4042 of
ERISA or which  may  result in the  imposition  of a lien on its  properties  or
assets;  notify the Bank in writing  promptly after it has come to the attention
of senior  management  of Willis of the  assertion or threat of any  "reportable
event" or other event  described in ss.4042 of ERISA  (relating to the soundness
of a Plan) or the PBGC's  ability to assert a material  liability  against it or
impose a lien on its,  or any  ERISA  Affiliates',  properties  or  assets;  and
refrain from engaging in any Prohibited Transactions or actions causing possible
liability under ss.5.02 of ERISA.

        5.4.  Compliance with Regulations.  Comply in all material respects with
all  Regulations  applicable  to its  business,  the  noncompliance  with  which
reasonably could have a Material Adverse Effect.

        5.5. Conduct of Business;  Permits and Approvals,  Compliance with Laws.
Continue to engage in an efficient  and  economical  manner in a business of the
same general type as conducted by it on the date of this Agreement;  maintain in
full force and effect, its franchises,  and all licenses,  patents,  trademarks,
trade names,  contracts,  permits,  approvals and other rights  necessary to the
profitable conduct of its business.

        5.6.  Maintenance  of  Properties.  Willis will  maintain or cause to be
maintained in good repair,  working order and condition all  properties  used or
useful  in  its  business  and  make  all  reasonable  and  necessary  renewals,
replacements,  additions,  betterments and improvements  thereof and thereto, so
that the business  carried on in  connection  therewith  may be conducted in the
ordinary course at all times.

        5.7. Ownership; Management. At least 50.1% of the common stock of Willis
shall  continue to be owned of record and  beneficially  by Charles F. Willis or
CFW  Partners,  L.P., a limited  partnership.  Further,  Charles F. Willis shall
continue to be Chief  Executive  Officer of Willis and Steven D. Oldenburg shall
continue to be Senior Vice President of Capital Markets of Willis.

        5.8. Maintenance of Insurance. Maintain insurance with financially sound
and reputable  insurance  companies or associations in such amounts and covering
such risks as are usually carried by companies  engaged in the same or a similar
business and similarly  situated,  which  insurance  may provide for  reasonable
deductibility from coverage thereof.

        5.9. Payment of Debt;  Payment of Taxes,  Etc. Where the amount involved
exceeds $250,000 or where the non-payment or non-discharge  would otherwise have
a  Material  Adverse  Effect on Willis or any of its  assets:  promptly  pay and
discharge  (a) all of its Debt in  accordance  with the terms  thereof;  (b) all
taxes,  assessments,  and governmental charges or levies imposed upon it or upon
its income and profits,  upon any of its property,  real,  personal or mixed, or
upon any part thereof,  before the same shall become in default;  (c) all lawful
claims for labor,  materials and supplies or otherwise,  which, if unpaid, might
become a lien or  charge  upon  such  property  or any part  thereof;  provided,
however,  that so long as Willis first  notifies the Bank of its intention to do
so,  Willis  shall not be  required  to pay and  discharge  any such Debt,  tax,
assessment,  charge, levy or claim so long as the failure to so pay or discharge
does not  constitute  or result in an Event of  Default or a  Potential  Default
hereunder and so long as no foreclosure or other similar  proceedings shall have
been  commenced  against  such  property or any part  thereof and so long as the
validity  thereof  shall be contested in good faith by  appropriate  proceedings
diligently  pursued and it shall have set aside on its books  adequate  reserves
with respect thereto.

                                                                   Dated
Credit Agreement                       - 20 -                      June 12, 1997


        5.10. Notice of Events.  Promptly upon discovery of any of the following
events,  Willis shall provide  telephone  notice to the Bank  (confirmed  within
three (3) calendar days by written notice),  describing the event and all action
Willis proposes to take with respect thereto:

         (a) an Event of Default or Potential  Default  under this  Agreement or
any other Loan Document;

         (b) any default or event of default  under a contract or contracts  and
the  default or event of default  involves  payments  by Willis in an  aggregate
amount equal to or in excess of $250,000;

         (c) a default or event of default  under or as defined in any  evidence
of or  agreements  for  Indebtedness  for  Borrowed  Money under which  Willis's
liability is equal to or in excess of $250,000,  singularly or in the aggregate,
whether or not an event of default  thereunder has been declared by any party to
such  agreement  or any event  which,  upon the  lapse of time or the  giving of
notice or both,  would  become an event of default  under any such  agreement or
instrument  or  would  permit  any  party to any such  instrument  agreement  to
terminate or suspend any  commitment to lend to Willis or to declare or to cause
any such  indebtedness to be accelerated or payable before it would otherwise be
due;

         (d) the institution of, any material adverse  determination  in, or the
entry of any default  judgment or order or stipulated  judgment or order in, any
suit, action,  arbitration,  administrative proceeding,  criminal prosecution or
governmental  investigation against Willis in which the amount in controversy is
in excess of $250,000, singularly or in the aggregate; or

         (e)  any  change  in any  Regulation,  including,  without  limitation,
changes in tax laws and regulations, which would have a Material Adverse Effect.

        5.11. Inspection Rights. At any time during the existence of an Event of
Default or Potential Default, during regular business hours and then as often as
requested of Willis by the Bank,  permit the Bank,  or any  authorized  officer,
employee,  agent,  or  representative  of the Bank to examine and make abstracts
from the records and books of account of Willis,  wherever located, and to visit
the properties of Willis; and to discuss the affairs,  finances, and accounts of
Willis with its Chairman,  President,  any executive  vice  president,  it chief
financial officer, treasurer, controller or independent accountants. If no Event
of Default or Potential Default shall be in existence, the Bank shall limit such
examination  to once each calendar year.  Willis shall  reimburse the Bank up to
$5,000  promptly  following  the  completion  of each such  examination.  In the
inspection  shall be made during the  continuance  of a Potential  Default or an
Event of Default,  Willis  shall  reimburse  the Bank for the Bank's  reasonable
out-of-pocket  expense of such  inspection.  At all times,  it is understood and
agreed by Willis that all expenses in connection with any such inspection  which
may be incurred by Willis,  any officers and employees thereof and the attorneys
and independent  certified public accountants therefor shall be expenses payable
by Willis and shall not be expenses of the Bank.

        5.12.  Generally  Accepted  Accounting  Principles.  Maintain  books and
records  at  all  times  in  accordance  with  Generally   Accepted   Accounting
Principles.

        5.13.  Compliance  with  Material  Contracts.  Willis will comply in all
material  respects with all  obligations,  terms,  conditions and covenants,  as
applicable,  in all Debt of Willis and all  instruments  and agreements  related
thereto,  and all other  instruments and agreements to which it is a party or by
which it

                                                                   Dated
Credit Agreement                       - 21 -                      June 12, 1997


is bound or any of its  properties  is  affected  and in  respect  of which  the
failure to comply reasonably could have a Material Adverse Effect.

        5.14.  Use of  Proceeds.  Willis will use the  proceeds of any Loan made
pursuant hereto for the purchase of Equipment as provided herein.

        5.15.  Further  Assurances.  Do such further acts and things and execute
and  deliver to the Bank such  additional  assignments,  agreements,  powers and
instruments,  as the Bank may reasonably require or reasonably deem advisable to
carry into effect the purposes of this Agreement or to better assure and confirm
unto the Bank its rights, powers and remedies hereunder.

                              6. Negative Covenants

         Willis covenants and agrees that,  without the prior written consent of
the Bank,  from and  after the date  hereof  and so long as  Obligation  remains
unpaid or outstanding, it will not:

        6.1.  Consolidation  and Merger.  Merge or consolidate  with or into any
corporation  except,  if (1) no Potential Default or Event of Default shall have
occurred and be continuing either  immediately prior to or upon the consummation
of such transaction, and (2) Willis is the surviving entity.

        6.2.  Liens.  Create,  assume  or permit to exist any Lien on any of its
property or assets,  whether now owned or hereafter acquired, or upon any income
or profits therefrom, except Permitted Liens.

        6.3.  Guarantees.  Guarantee  or  otherwise  in  any  way  become  or be
responsible  for   indebtedness  or  obligations   (including   working  capital
maintenance,  take-or-pay contracts) of any unconsolidated Person,  contingently
or  otherwise.  Notwithstanding  the  preceding  sentence,  Willis may guarantee
indebtedness  or  obligations  of  unconsolidated  Affiliates  in amounts not to
exceed $15,000,000 in the aggregate, in the ordinary course of business with the
prior  written  consent  of the  Bank,  which  consent  not  to be  unreasonably
withheld.

        6.4.  Margin Stock.  Use or permit any proceeds of the Loans to be used,
either directly or indirectly, for the purpose, whether immediate, incidental or
ultimate,  of buying or carrying margin stock within the meaning of Regulation U
of The Board of Governors of the Federal Reserve System, as amended from time to
time.

        6.5. Acquisitions and Investments. If an Event of Default or a Potential
Default  exists or would exist  immediately  thereafter:  purchase or  otherwise
acquire  (including  without  limitation  by way of share  exchange) any part or
amount of the capital stock or assets of, or make any  Investments  in any other
Person;  or enter into any new  business  activities  or ventures  not  directly
related to its present  business;  or create any  Subsidiary,  except (a) it may
acquire and hold stock,  obligations  or  securities  received in  settlement of
debts (created in the ordinary  course of business)  owing to it, and (b) it may
make and own (i)  Investments in certificates of deposit or time deposits having
maturities in each case not exceeding one year from the date of issuance thereof
and issued by Bank, or any  FDIC-insured  commercial  bank  incorporated  in the
United States or any state thereof having a combined  capital and surplus of not
less than $150,000,000, (ii) Investments in marketable direct obligations issued
or  unconditionally  guaranteed  by the  United  States

                                                                   Dated
Credit Agreement                       - 22 -                      June 12, 1997


of America,  any agency  thereof,  or backed by the full faith and credit of the
United States of America, in each case maturing within one year from the date of
issuance or acquisition thereof, (iii) Investments in commercial paper issued by
a corporation incorporated in the United States or any State thereof maturing no
more  than  one  year  from the date of  issuance  thereof  and,  at the time of
acquisition, having a rating of A-1 (or better) by Standard & Poor's Corporation
or P-1 (or better) by Moody's Investors  Service,  Inc., and (iv) Investments in
money  market  mutual  funds all of the assets of which are  invested in cash or
investments described in the immediately preceding clauses (i), (ii) and (iii).

        6.6.  Transfer  of  Assets;  Nature of  Business.  Willis  may not sell,
transfer, lease or dispose of assets constituting more than twenty percent (20%)
of its assets  during any twelve  month  period  without the written  consent of
CoreStates,  such consent not to be unreasonably  withheld.  Notwithstanding the
above,  (1) Willis may sell,  transfer,  pledge,  assign,  re-lease or otherwise
dispose of any equipment  coming off lease if such sale or disposition is in the
ordinary course of its business,  (2) Willis may sell individual or small groups
of leases and related  equipment  from time to time and sell groups of leases in
securitization  transactions  and (3) Willis may  engage in the  nonrecourse  or
partial recourse financing of leases.  Willis may not discontinue,  liquidate or
change  in any  material  respect  any  substantial  part of its  operations  or
business.

        6.7.   Accounting   Change.   Without  the  prior  written  approval  of
CoreStates,  make or permit any material change in financial accounting policies
or  financial  reporting  practices,  except as required by  Generally  Accepted
Accounting  Principles or regulations of the Securities and Exchange Commission,
if applicable.

        6.8  Transactions  with Affilates.  Enter into any material  transaction
(including,  without limitation, the purchase, sale or exchange of property, the
rendering of any services or the payment of management fees) with any Affiliate,
except  transactions  in the ordinary  course of, and pursuant to the reasonable
requirements  of,  its  business,  and  in  good  faith  and  upon  commercially
reasonable terms.

        6.9. Restriction on Amendment of This Agreement. Enter into or otherwise
become  subject to or suffer to exist any  agreement  which would  require it to
obtain  the  consent  of any  other  person as a  condition  to the  ability  of
CoreStates and Willis to amend or otherwise modify this Agreement.


                             7. Financial Covenants

        7.1. No losses.  From and after April 1, 1997,  Willis  shall not at any
time suffer a net loss for the four (4) most - recently ended consecutive Fiscal
Quarters.

        7.2. Minimum Tangible Net Worth. Tangible Net Worth will not at any time
be less than $19,000,000.

        7.3. Debt to Tangible Net Worth. From and after April 1, 1997, the ratio
of Debt  (including,  without  limitation,  Debt  represented  by the  Note)  to
Tangible Net Worth will not exceed 6.00:1 as at the end of any fiscal quarter.

        7.4. Minimum Interest  Expense  Coverage.  From and after April 1, 1997,
the ratio of EBIT to interest for the four (4) most recently  ended  consecutive
Fiscal Quarters will not be less than 1.25:1.

                                                                   Dated
Credit Agreement                       - 23 -                      June 12, 1997


        7.5. Borrowing Base. The aggregate principal amount of Loans outstanding
shall  not  at any  time  exceed  the  Borrowing  Base  or  the  Revolving  Loan
Commitment,  whichever is less; provided,  however, that this covenant shall not
be deemed  breached if, at the time such  aggregate  amount  exceeds said level,
within  four  Business  Days  after the  earlier  of the date  Willis  first has
knowledge  of such  excess or the date of the next  Borrowing  Base  Certificate
disclosing the existence of such excess,  a prepayment of Loans shall be made in
an amount  sufficient to assure  continued  compliance with this covenant in the
future.



                                   8. Default

        8.1. Events of Default. Willis shall be in default if any one or more of
the following events (each an "Event of Default") occurs:

        (a)  Payments.  Willis fails to pay any  principal of or interest on the
        Revolving  Credit Note when due and payable within five Business Days of
        the due date (whether at maturity,  by notice of intention to prepay, or
        otherwise)  or fails to pay when it is due and payable any other  amount
        payable under any Loan  Document and such failure  shall  continue for a
        period of five Business Days or more.

        (b)  Covenants.  Willis  fails to observe or perform (1) within  fifteen
        days after receiving  written notice from the Bank, any term,  condition
        or covenant set forth in ss.ss.5.1(a), 5.1(b), 5.1(c), 5.1(g), 5.1(h) or
        5.1(i) herein, (2) any term, condition or covenant set forth in ss.5.2 ,
        ss.ss.6.1  through 6.9 or ss.8.1(a)  herein, as and when required or (3)
        any term, condition or covenant contained in this Agreement or any other
        Loan Document other than as set forth in (1) and (2) above,  as and when
        required  and such  failure  shall  continue for a period of 10 Business
        Days or more.

        (c) Representations,  Warranties. Any representation or warranty made or
        deemed  to be made by  Willis,  as  applicable,  herein  or in any  Loan
        Document or in any exhibit,  schedule,  report or certificate  delivered
        pursuant hereto or thereto shall prove to have been false, misleading or
        incorrect in any material respect when made or deemed to have been made.

        (d) Bankrupcy.  Willis is dissolved or  liquidated,  makes an assignment
        for the  benefit  of  creditors,  files a  petition  in  bankruptcy,  is
        adjudicated insolvent or bankrupt,  petitions or applies to any tribunal
        for any receiver or trustee, commences any proceeding relating to itself
        under any bankruptcy, reorganization,  readjustment of debt, dissolution
        or liquidation law or statute of any jurisdiction, has commenced against
        it any such proceeding which remains  undismissed for a period of thirty
        (60) days, or indicates its consent to,  approval of or  acquiescence in
        any such  proceeding,  or any  receiver  of or trustee for Willis or any
        substantial part of the property of Willis is appointed,  or if any such
        receivership  or trusteeship to continues  undischarged  for a period of
        thirty (60) days.

        (e)  Certian  Other  Defaults.  Willis  shall  fail to pay  when due any
        Indebtedness  for Borrowed  Money which  singularly  or in the aggregate
        exceeds   $5,000,000,   and  such  failure  shall  continue  beyond  any
        applicable  cure period,  or Willis shall suffer to exist any default or
        event of  default  in the  performance  or  observance,  subject  to any
        applicable grace period, of any agreement,  term,

                                                                   Dated
Credit Agreement                       - 24 -                      June 12, 1997


        condition or covenant with respect to any agreement or document relating
        to  Indebtedness  for Borrowed Money if the effect of such default is to
        permit,  with the  giving  of  notice or  passage  of time or both,  the
        holders thereof,  or any trustee or agent for said holders, to terminate
        or suspend any commitment (which is equal to or in excess of $5,000,000)
        to lend  money or to cause or  declare  any  portion  of any  borrowings
        thereunder to become due and payable prior to the date on which it would
        otherwise be due and payable,  provided that during any applicable  cure
        period the Bank's  obligations  hereunder to make further Loans shall be
        suspended.

        (f)  Judgments.  Any judgments  against  Willis or against its assets or
        property for amounts in excess of  $5,000,000  in the  aggregate  remain
        unpaid, unstayed on appeal, undischarged, unbonded and undismissed for a
        period of thirty (30) days.

        (g)  Attachments.  Any assets of Willis shall be subject to attachments,
        levies,  or  garnishments  for  amounts  in  excess of  $250,000  in the
        aggregate which have not been dissolved or satisfied  within twenty (20)
        days after service of notice thereof to Willis.

        (h) Change in  Control.  Charles  F.  Willis or the CFW  Partners,  L.P.
        limited  partnership,  shall cease to be the record and beneficial owner
        of at least 50.1% of the issued and outstanding voting and capital stock
        of Willis.

        (i) Security  Interests.  Any security  interest created pursuant to any
        Loan Document shall cease to be in full force and effect, or shall cease
        in any material respect to give the Bank, the Liens, rights,  powers and
        privileges   purported  to  be  created  thereby   (including,   without
        limitation,  a perfected  security  interest in, and Lien on, all of the
        Collateral),  superior to and prior to the rights of all third  Persons,
        and subject to no other Liens (except as permitted by ss.6.2).

THEN and in every such event other than that specified in  ss.8.1.(d),  the Bank
may immediately  terminate the Revolving Loan Commitment by notice in writing to
Willis and  immediately  declare the Revolving  Credit Note,  including  without
limitation  accrued interest,  to be, and they shall thereupon  forthwith become
due and payable without presentment, demand, or notice of any kind, all of which
are  hereby  expressly  waived  by  Willis.  Upon the  occurrence  of any  event
specified in  ss.8.1.(d),  the Revolving  Loan  Commitment  shall  automatically
terminate and the Revolving Credit Note,  including without  limitation  accrued
interest,  shall  immediately be due and payable  without  presentment,  demand,
protest or other notice of any kind, all of which are hereby expressly waived by
Willis.  Any date on which the Loans and such other Obligations are declared due
and payable pursuant to this ss.8.1,  shall be the Revolver Termination Date for
purposes of this  Agreement.  From and after the date an Event of Default  shall
have  occurred and for so long as an Event of Default shall be  continuing,  the
Loans shall bear interest at the Default Rate.

                                                                   Dated
Credit Agreement                       - 25 -                      June 12, 1997


                                  9. Collateral

        9.1. Collateral. Except as otherwise specifically set forth herein or in
any other Loan Document,  any Loans made and  outstanding and their repayment at
all times  shall  (i) in the case of  Collateral  (as  defined  in the  Security
Agreement,  hereinafter  referred to as the "Collateral")  located in the United
States, be secured by a first priority  perfected  security interest and (ii) in
the case of Collateral  located in jurisdictions  outside the United States,  be
secured  by a  security  interest,  which  in the  determination  of  the  Bank,
adequately protects the first priority security interest in favor of the Bank.

        9.2. Security Agreement. As security for the punctual payment in full of
all Loans  (including  all payments of  principal,  and interest and other costs
contemplated  hereby),  Willis  at or prior to the  funding  of the  first  Loan
hereunder  shall  execute and deliver to CoreStates  the Security  Agreement and
such other  documents as may be necessary to constitute  and evidence a security
interest in the Collateral.


        9.3. Prepayments and Release of Collateral.

        (a) Category A Equipment Held For Sale or Subject To Lease. In the event
Willis wishes to sell, or otherwise  remove from the Borrowing  Base any item of
Equipment it shall pay to CoreStates  an amount equal to 85% of the  acquisition
cost of the  Equipment  (or 85% of the  net  book  value  of the  Equipment,  as
applicable)  as shown  on the  books  and  records  of  Willis,  in  which  case
CoreStates shall release its Lien in said Equipment and any related lease.

        (b)  Category A Equipment  Not Subject to Lease;  Held for Greater  Than
Nine  Months.  In the event any item of  Category  A  Equipment  shall have been
purchased and held for greater than nine months,  Willis shall pay to CoreStates
an amount equal to 85% of the  acquisition  cost of the Equipment (or 85% of the
net book value, as applicable),  as shown on the books and records of Willis, in
which case CoreStates shall release its Lien in said Equipment.

        (c)  Category  B(1)  Equipment.  In the event any item of Category  B(1)
Equipment shall have been purchased and held for greater than nine months or any
engine shall be removed from such item of Category B(1) Equipment,  Willis shall
pay to  CoreStates  an  amount  equal  to 85% of  the  acquisition  cost  of the
Equipment (or 85% of the net book value of the  Equipment,  as  applicable),  as
shown on the books and records of Willis, in which case CoreStates shall release
its Lien in said Equipment.

        (d)  Category  B(2)  Equipment.  In the event any item of Category  B(2)
Equipment shall cease to be the subject of an Eligible  Lease,  Willis shall pay
to  CoreStates an amount equal to 85% of the  acquisition  cost of the Equipment
(or 85% of the net book value of the Equipment, as applicable),  as shown on the
books and records of Willis,  in which case CoreStates shall release its Lien in
said Equipment and in the related lease.

        (e) Event of Default or Potential Default. Notwithstanding the above, if
at the time of such sale or removal of such  Equipment  from the Borrowing  Base
pursuant to subsections (a) through (d) of this section,  there is then existing
an Event of Default or Potential Default,  Willis shall pay to CoreStates (1) in
the event Willis has sold any item of Equipment as described in this ss.9.3, all
proceeds from such sale, or (2) in the event such  Equipment has otherwise  been
removed  from  the  Borrowing  Base as  described  in

                                                                   Dated
Credit Agreement                       - 26 -                      June 12, 1997


this ss.9.3,  100% of the acquisition  cost of the Equipment (or 100% of the net
book value of the Equipment, as applicable).

                                10. Miscellaneous

        10.1.  Waiver. No failure or delay on the part of the Bank or any holder
of the Note in  exercising  any right,  power or remedy under any Loan  Document
shall operate as a waiver thereof;  nor shall any single or partial  exercise of
any such right,  power or remedy preclude any other or further  exercise thereof
or the exercise of any other right, power or remedy under any Loan Document. The
remedies  provided  under the Loan Documents are cumulative and not exclusive of
any remedies provided by law.

        10.2. Amendments. No amendment,  modification,  termination or waiver of
any Loan Document or any  provision  thereof nor any consent to any departure by
Willis  therefrom shall be effective unless the same shall have been approved in
writing by the Bank, be in writing and be signed by the Bank and Willis and then
any such waiver or consent  shall be effective  only in the instance and for the
specific  purpose for which  given.  No notice to or demand on the Willis  shall
entitle  Willis to any other or  further  notice or demand in  similar  or other
circumstances.

        10.3.  Governing Law. The Loan Documents and all rights and  obligations
of the parties  thereunder shall be governed by and be construed and enforced in
accordance with the laws of the  Commonwealth of Pennsylvania  without regard to
Pennsylvania or federal principles of conflict of laws.

        10.4.  Participations  and Assignments.  Willis hereby  acknowledges and
agrees  that  CoreStates  may at any time,  with the  consent  of Willis  (which
consent shall not be unreasonably withheld):  (a) grant participations in all or
any portion of its  Revolving  Loan  Commitment or any portion of the Note or of
its right, title and interest therein or in or to this Agreement  (collectively,
"Participations")  to any other lending office of the CoreStates or to any other
bank, lending institution or other entity which has the requisite sophistication
to   evaluate   the  merits   and  risks  of   investments   in   Participations
("Participants");  provided,  however,  that: (i) all amounts  payable by Willis
hereunder   shall  be  determined   as  if  CoreStates   had  not  granted  such
Participation;  (ii)  CoreStates  shall act as agent for all  Participants;  and
(iii) any agreement pursuant to which CoreStates may grant a Participation:  (x)
shall provide that CoreStates shall retain the sole right and  responsibility to
enforce the obligations of Willis hereunder including,  without limitation,  the
right to approve any amendment, modification or waiver of any provisions of this
Agreement; (y) such participation agreement may provide that CoreStates will not
agree to any  modification,  amendment or waiver of this  Agreement  without the
consent of the  Participant  if such  modification,  amendment  or waiver  would
reduce the  principal  of or rate of interest  on any Loan or postpone  the date
fixed for any payment of principal of or interest on any Loan; and (z) shall not
relieve  CoreStates from its obligations,  which shall remain absolute,  to make
Loans  hereunder;  and  (b)  assign  any of its  Loans  and its  Revolving  Loan
Commitment.  Upon  execution  and  delivery  by the  assignee  to  Willis  of an
instrument in writing  pursuant to which such assignee agrees to become a "Bank"
hereunder  having the  Revolving  Loan  Commitment  and Loans  specified in such
instrument,  and upon consent  thereto by Willis,  to the extent required above,
the assignee  shall have,  to the extent of such  assignment  (unless  otherwise
provided in such  assignment with the consent of the Willis),  the  obligations,
rights and benefits of a Bank hereunder  holding the Revolving  Loan  Commitment
and Loans (or portions  thereof)  assigned to it, and CoreStates  Bank shall, to
the extent of such  assignment,  be released from the  Commitment (or portion(s)
thereof)  so  assigned.

                                                                   Dated
Credit Agreement                       - 27 -                      June 12, 1997


        10.5.  Captions.  Captions  in  the  Loan  Documents  are  included  for
convenience  of  reference  only and  shall  not  constitute  a part of any Loan
Document for any other purpose.

        10.6. Notices. All notices, requests, demands, directions,  declarations
and other  communications  between the Bank and the Willis  provided  for in any
Loan  Document  shall,  except as  otherwise  expressly  provided,  be mailed by
registered or certified  mail,  return receipt  requested,  or  telegraphed,  or
faxed,  or delivered in hand to the  applicable  party at its address  indicated
opposite  its  name on the  signature  pages  hereto.  The  foregoing  shall  be
effective  and deemed  received  three days after being  deposited in the mails,
postage  prepaid,  addressed as aforesaid  and shall  whenever sent by telegram,
telegraph or fax or delivered in hand be effective when received.  Any party may
change its address by a communication in accordance herewith.

        10.7. Expenses; Indemnification. Willis will from time to time reimburse
the Bank promptly  following  demand for all reasonable  out-of-pocket  expenses
(including the reasonable fees and expenses of legal counsel) in connection with
(i) the  preparation  of the Loan  Documents  (subject  to a  maximum  amount of
$25,000 in the case of fees of legal  counsel,  (ii) the making of any Loans and
(iii) the  administration of the Loan Documents;  and reimburse the Bank for all
out-of-pocket expenses (including reasonable fees and expenses of legal counsel)
in connection  with the  enforcement of the Loan  Documents.  In addition to the
payment of the foregoing  expenses,  Willis hereby agrees to indemnify,  protect
and  hold  the Bank and any  holder  of the  Note and the  officers,  directors,
employees,  agents,  affiliates  and  attorneys  of the  Bank  and  such  holder
(collectively,  the  "Indemnitees")  harmless  from  and  against  any  and  all
liabilities, obligations, losses, damages, penalties, actions, judgments, suits,
costs,  expenses and disbursements of any kind or nature,  including  reasonable
fees and  expenses of legal  counsel,  which may be imposed on,  incurred by, or
asserted  against such Indemnitee by Willis or other third parties and arise out
of or relate to this  Agreement or the other Loan  Documents or any other matter
whatsoever  related to the  transactions  contemplated by or referred to in this
Agreement or the other Loan Documents; provided, however, that Willis shall have
no  obligation  to an  Indemnitee  hereunder  to the extent  that the  liability
incurred  by  such  Indemnitee  has  been  determined  by a court  of  competent
jurisdiction to be the result of gross negligence or willful  misconduct of such
Indemnitee.

        10.8.  Survival of Warranties and Certain  Agreements.  All  agreements,
representations and warranties expressly made herein shall survive the execution
and  delivery  of this  Agreement,  the  making of the Loans  hereunder  and the
execution and delivery of the Note.  Notwithstanding  anything in this Agreement
or implied by law to the contrary, the agreements of Willis set forth in ss.10.7
shall survive the payment of the Loans and the  termination  of this  Agreement.
This Agreement shall remain in full force and effect until the repayment in full
of all amounts owed by Willis under the Note or any other Loan Document.

        10.9.  Severability.  The invalidity,  illegality or unenforceability in
any  jurisdiction of any provision in or obligation  under this  Agreement,  the
Note or other Loan Documents  shall not affect or impair the validity,  legality
or  enforceability  of  the  remaining  provisions  or  obligations  under  this
Agreement,  the Note or other Loan  Documents or of such provision or obligation
in any other jurisdiction.

        10.10. No Fiduciary  Relationship.  No provision in this Agreement or in
any of the other Loan  Documents  and no course of dealing  between  the parties
shall be deemed to create any fiduciary duty by the Bank to Willis.

                                                                   Dated
Credit Agreement                       - 28 -                      June 12, 1997


        10.11.  CONSENT  TO  JURISDICTION  AND  SERVICE OF  PROCESS.  WILLIS AND
CORESTATES  EACH  HEREBY  CONSENTS TO THE  JURISDICTION  OF ANY STATE OR FEDERAL
COURT LOCATED WITHIN THE EASTERN DISTRICT OF PENNSYLVANIA AND IRREVOCABLY AGREES
THAT,  ANY ACTIONS OR PROCEEDINGS  ARISING OUT OF OR RELATING TO THE NOTE,  THIS
AGREEMENT OR THE OTHER LOAN DOCUMENTS MAYBE LITIGATED IN SUCH COURTS. EACH PARTY
TO THIS  AGREEMENT  ACCEPTS FOR ITSELF AND IN  CONNECTION  WITH ITS  PROPERTIES,
GENERALLY AND  UNCONDITIONALLY,  THE NONEXCLUSIVE  JURISDICTION OF THE AFORESAID
COURTS AND WAIVES ANY DEFENSE OF FORUM NON CONVENIENT, AND IRREVOCABLY AGREES TO
BE BOUND BY ANY JUDGMENT RENDERED THEREBY IN CONNECTION WITH THIS AGREEMENT, ANY
NOTE, OR SUCH OTHER LOAN DOCUMENT.

        10.12.  WAIVER OF JURY TRIAL.  WILLIS AND CORESTATES  EACH HEREBY WAIVES
ITS RESPECTIVE RIGHTS TO A JURY TRIAL OF ANY CLAIM OR CAUSE OF ACTION BASED UPON
OR ARISING OUT OF THIS  AGREEMENT,  ANY OF THE LOAN  DOCUMENTS,  OR ANY DEALINGS
BETWEEN  THEM  RELATING  TO  THE  SUBJECT  MATTER  OF  THIS  AGREEMENT  AND  THE
LENDER/BORROWER  RELATIONSHIP  ESTABLISHED  HEREBY.  THE SCOPE OF THIS WAIVER IS
INTENDED TO BE ALL-ENCOMPASSING OF ANY AND ALL DISPUTES THAT MAY BE FILED IN ANY
COURT AND THAT  RELATE TO THE  SUBJECT  MATTER  OF THIS  TRANSACTION,  INCLUDING
WITHOUT LIMITATION, CONTRACT CLAIMS, TORT CLAIMS, BREACH OF DUTY CLAIMS, AND ALL
OTHER COMMON LAW AND STATUTORY  CLAIMS.  WILLIS AND CORESTATES EACH ACKNOWLEDGES
THAT THIS  WAIVER IS A MATERIAL  INDUCEMENT  TO THE  TRANSACTION,  THAT EACH HAS
ALREADY  RELIED ON THE WAIVER IN ENTERING INTO THIS AGREEMENT AND THAT EACH WILL
CONTINUE  TO RELY ON THE WAIVER IN THEIR  RELATED  FUTURE  DEALINGS.  WILLIS AND
CORESTATES  EACH FURTHER  WARRANTS AND  REPRESENTS  THAT EACH HAS REVIEWED  THIS
WAIVER WITH ITS LEGAL COUNSEL,  AND THAT EACH KNOWINGLY AND  VOLUNTARILY  WAIVES
ITS JURY TRIAL RIGHTS FOLLOWING  CONSULTATION WITH LEGAL COUNSEL. THIS WAIVER IS
IRREVOCABLE, AND THE WAIVER SHALL APPLY TO ANY SUBSEQUENT AMENDMENTS,  RENEWALS,
SUPPLEMENTS, MODIFICATIONS,  REPLACEMENTS OR RESTATEMENTS TO THIS AGREEMENT, THE
LOAN DOCUMENTS,  OR TO ANY OTHER DOCUMENTS OR AGREEMENTS  RELATING TO THE LOANS.
IN THE EVENT OF LITIGATION,  THIS AGREEMENT MAY BE FILED AS A WRITTEN CONSENT TO
A TRIAL BY THE COURT.

        10.13.  Counterparts;  Effectiveness.  This  Agreement and any amendment
hereto or waiver  hereof  may be signed in any number of  counterparts,  each of
which shall be an original,  with the same effect as if the  signatures  thereto
and hereto were upon the same  instrument.  This  Agreement  and any  amendments
hereto or  waivers  hereof  shall  become  effective  when the Bank  shall  have
received  signed  counterparts  or notice by fax of the signature  page that the
counterpart  has been signed and is being delivered to it or facsimile that such
counterparts have been signed by all the parties hereto or thereto.

        10.14.  Use of Defined  Terms.  All words used herein in the singular or
plural  shall be deemed to have been used in the  plural or  singular  where the
context or  construction  so  requires.  Any defined  term used in the  singular
preceded by "any"  shall be taken to  indicate  any number of the members of the
relevant class.

                                                                   Dated
Credit Agreement                       - 29 -                      June 12, 1997


        10.15.  Offsets.  Nothing in this Agreement  shall be deemed a waiver or
prohibition of the Bank's right of banker's lien or offset.

        10.16 Entire  Agreement.  This Agreement,  the Note issued hereunder and
the other Loan  Documents  constitute  the entire  understanding  of the parties
hereto as of the date  hereof  with  respect to the  subject  matter  hereof and
thereof and supersede any prior agreements, written or oral, with respect hereto
or thereto.

                                                                   Dated
Credit Agreement                       - 30 -                      June 12, 1997


         IN WITNESS WHEREOF,  the parties hereto have each caused this Agreement
to be duly  executed  by their duly  authorized  representatives  as of the date
first above written.


                                                WILLIS LEASE FINANCE CORPORATION


                                                By  /s/    Charles F. Willis
                                                   -----------------------------
                                                    Name:  Charles F. Willis
                                                    Title: President / CFO
Notices To:
Steven D. Oldenburg
Senior Vice President-Capital Markets
180 Harbor Drive
Suite 200
Sausilito, CA 94965

                                                CORESTATES BANK, N.A.


                                                By  /s/    Hugh  Connelly
                                                   -----------------------------
                                                    Name:  Hugh W. Connelly
                                                    Title: Vice President
Notices To:
Hugh W. Connelly
Vice President
CoreStates Bank, N.A.
Transportation and Leasing Division
FC 1-8-11-24
1339 Chestnut Street
Philadelphia, PA  19107
FAX No. (215) 786-7704

                                                                   Dated
Credit Agreement                       - 31 -                      June 12, 1997




                         Reference Table of Definitions


definition                                                          page defined

Affiliate......................................................................1
Agreement......................................................................1
Agreement Year.................................................................9
Bank...........................................................................1
Borrowing Base.................................................................1
Borrowing Base Certificate.....................................................2
Business Day...................................................................2
Capitalized Lease..............................................................2
Capitalized Lease Obligations..................................................2
Category A Equipment...........................................................2
Category B Equipment...........................................................2
Closing Date...................................................................2
Closing Fee...................................................................11
Code...........................................................................2
Collateral.....................................................................2
Compliance Certificate.........................................................2
CoreStates.....................................................................1
CoreStates Bank................................................................1
Debt...........................................................................3
Debt Service...................................................................3
Default Rate...................................................................3
Dollars........................................................................3
EBIT...........................................................................3
Eligible Lease Receivables.....................................................3
Environmental Control Statutes.................................................4
Equipment......................................................................4
ERISA..........................................................................4
ERISA Affiliate................................................................4
Event of Default...............................................................4
Fiscal Quarter.................................................................4
Fiscal Year....................................................................4
GAAP...........................................................................4
Generally Accepted Accounting Principles.......................................4
Governmental Authority.........................................................4
Hazardous Substances...........................................................4
Indebtedness for Borrowed Money................................................4
Indemnitees...................................................................28
Intangible Assets..............................................................5
Investment.....................................................................5
Lien...........................................................................5
Loan...........................................................................5

                                                                   Dated
Credit Agreement                       - 32 -                      June 12, 1997


Loan Documents.................................................................5
Loans..........................................................................5
Material Adverse Change........................................................5
Material Adverse Effect........................................................5
Maximum Loan Amount............................................................9
Monthly Lease Portfolio........................................................5
Multiemployer Plan.............................................................6
Net Income.....................................................................6
Net Worth......................................................................6
Note...........................................................................6
Obligations....................................................................6
Participants..................................................................27
Participations................................................................27
PBGC...........................................................................6
Pension Plan...................................................................6
Permitted Liens................................................................6
Person.........................................................................7
Plan...........................................................................7
Potential Default..............................................................7
Prime Rate.....................................................................7
Prohibited Transaction.........................................................7
Receivables Report.............................................................5
Regulation.....................................................................7
Release........................................................................7
Reportable Event...............................................................7
Revolver Termination Date......................................................7
Revolving Credit Loan..........................................................7
Revolving Credit Note..........................................................7
Revolving Loan Commitment......................................................7
Revolving Loan Commitment Fee..................................................8
Security Agreement.............................................................8
Solvent........................................................................8
Standby Letter of Credit.......................................................8
Subsidiary.....................................................................8
Tangible Net Worth.............................................................8
Termination Event..............................................................8
Unfunded Pension Liabilities...................................................8
Unrecognized Retiree Welfare Liability.........................................8
Willis.........................................................................1

                                                                   Dated
Credit Agreement                       - 33 -                      June 12, 1997






                                                                       EXHIBIT A

[LOGO]                           Revolving Credit Note


$15,000,000                                                     Philadelphia, PA
                                                                   June 12, 1997

For Value Received,  WILLIS LEASE FINANCE CORPORATION,  a California corporation
("Willis"),  hereby  promises to pay to the order of CORESTATES  BANK, N.A. (the
"Bank"),  in lawful  currency  of the United  States of  America in  immediately
available  funds at the Bank's  offices  located at Broad and Chestnut  Streets,
Philadelphia, Pennsylvania, on the Revolver Termination Date, or on such earlier
date or dates as provided in the Credit Agreement described below, the principal
sum of  FIFTEEN  MILLION  DOLLARS  ($15,000,000)  or, if less,  the then  unpaid
principal  amount of all Revolving Credit Loans made by the Bank pursuant to the
Credit Agreement.

Willis  promises also to pay interest on the unpaid  principal  amount hereof in
like money at such office  from the date  hereof  until paid at the rates and at
the times provided in the Credit Agreement.

This Note is Revolving  Credit Note  referred to in, is entitled to the benefits
of and is secured by security  interests  referred  to in the Credit  Agreement,
dated as of June 12,  1997 by and  between  Willis  and the Bank (as such may be
amended,  modified,  supplemented,  restated or replaced from time to time,  the
"Credit Agreement").  This Note is subject to voluntary prepayment and mandatory
repayment  prior to the  Revolver  Termination  Date,  in  whole or in part,  as
provided in the Credit Agreement.

In case an Event of Default shall occur and be continuing,  the principal of and
the  accrued  interest on this Note may be declared to be due and payable in the
manner and with the effect provided in the Credit Agreement.

Willis  hereby  waives  presentment,  demand,  protest  or notice of any kind in
connection with this Note.

Notwithstanding  the face  amount  of this  Note,  the  undersigned's  liability
hereunder  shall be  limited at all times to the  actual  aggregate  outstanding
indebtedness  to the  Bank  relating  to such  Bank's  Revolving  Credit  Loans,
including all  principal  and  interest,  together with all fees and expenses as
provided in the Credit Agreement, as established by the Bank's books and records
which shall be conclusive absent manifest error.

Capitalized terms used but not defined herein shall have the respective meanings
assigned to them in the Credit Agreement.

Note                                     -1-





THIS NOTE SHALL BE  CONSTRUED IN  ACCORDANCE  WITH AND BE GOVERNED BY THE LAW OF
THE  COMMONWEALTH  OF  PENNSYLVANIA  WITHOUT REGARD TO  PENNSYLVANIA  OR FEDERAL
PRINCIPLES OF CONFLICT OF LAWS.


                                              WILLIS LEASE FINANCE CORPORATION


                                              BY       /s/ Charles F. Willis
                                                --------------------------------
                                              Name:     Charles F. Willis
                                              Title:   Chief Executive Officer

                                      -2-



                                                                       EXHIBIT B



                           Borrowing Base Certificate



Date of Certificate:        _________________________

Date of Information:        _________________________



To:  CoreStates Bank, N.A.


Gentlemen:

This  Borrowing  Base  Certificate  is delivered to you pursuant to the terms of
ss.5.1 of the Credit  Agreement,  dated as of June 12,  1997,  as  currently  in
effect.  Capitalized terms used without  definition below have the same meanings
as they have in the Credit Agreement.

We hereby certify that:

1.       No Potential Default or Event of Default has occurred and is continuing
         as of the date of this Borrowing Base Certificate.

2.       There has been no Material Adverse Change since [insert the date of the
         most recent financial  statements delivered to the Bank pursuant to the
         terms of ss.5.1 of the Credit  Agreement],  except as  disclosed on the
         attached schedules.

3.       The  information set forth on the attached  schedules is true,  current
         and complete as of the date of this Borrowing Base Certificate.

                                                Willis Lease Finance Corporation


                                                By _____________________________
                                                Name:  Elliot M. Fischer
                                                Title:    CFO & Controller

Borrowing Base Certificate               -1-                   Date: ___________




                        Willis Lease Finance Corporation
                   Computation of Borrowing Base Availability
                         ____________________,_________



Collateral Loan Value

1.    Equipment (from Schedule A,                               $_______________
      attached hereto)

Maximum Loans

2.    Maximum Loans: $15,000,000                                $  15,000,000.00

Credit Usage

3.    Aggregate Loan Balance (principal) at date of certificate $_______________

Loan Availability

4.    Line 1 minus Line 3                                       $_______________

5.    Line 2 minus Line 3                                       $_______________

6.    Availability (Line 4 or Line 5 whichever is less)         $_______________

7.    Amount of Loan Requested This Date (if any)               $_______________
      (Not to exceed line 6)


Certification:                                  Willis Lease Finance Corporation



Date:  ____________________________             By:  ___________________________
                                                     Name:  Elliot M. Fischer
                                                     Title:    CFO & Controller

Borrowing Base Certificate               -2-                   Date: ___________


                        Willis Lease Finance Corporation
                       New Collateral Information Schedule
                                for Borrowing on
                            _______________,_________


Willis Lease Finance  Corporation has requested this date that a Loan be made to
it by CoreStates  Bank,  N.A. The following  table sets forth  information  with
respect to items being added to the Collateral with this Request for Loan.

Willis Lease Finance Corporation has delivered the original  counterpart of each
lease to CoreStates  Bank,  N.A. and it represents and warrants  hereby that all
other copies of each lease are clearly  marked to indicate  that each is not the
lessor's original counterpart of that lease.



Customer    Contract    Monthly    Lease     Remaining   Gross         Equipment
Name        Number      Payment    Term(1)   Term(2)     Remaining(3)  Cost(4)
- ---------   ---------   --------   -------   ---------   ------------  ---------








                                                          ----------   ---------
                                                Totals



                                               Willis Lease Finance Corporation


                                               By ______________________________
                                                  Name:  Elliot M. Fischer
                                                  Title:    CFO & Controller



1    This is the original term of months of the lease.

2    This is the  number  of months  remaining  on the lease at the date of this
     Schedule.

3    This is the gross  amount  remaining  payable in respect of the lease minus
     the unearned finance charge.

4    This is the purchase price of the equipment to Willis  Corporation as shown
     on the invoice of the manufacturer or distributor of the equipment.