THIS IS AN AGREEMENT OF LEASE, Made and entered into this 12th day of 
January, A.D. 1982, by and between SUSSEX COUNTY, a political subdivision of 
the State of Delaware, party of the first part, hereinafter referred to as 
"Landlord."

                                      - AND -

     GEORGETOWN AIRCRAFT SERVICES, INC., a Delaware corporation, party of the 
second part, hereinafter referred to as "Tenant."

                                W I T N E S S E T H :

     IN CONSIDERATION of the mutual covenants hereinafter expressed, the 
parties hereto agree as follows:

     1.  Landlord hereby leases to Tenant and Tenant hereby leases from 
Landlord, subject to the conditions hereinafter expressed, that certain 
parcel of real property, situate near Georgetown, Sussex County, Delaware, 
being more particularly described as follows.

     Lots 1 through 7, inclusive, on Indian River Avenue, (consisting of 
approximately 30,626 acres of land) in Sussex County Industrial Airpark as 
shown on map entitled Plot Plan, Sussex County Industrial Airpark, prepared 
by Associated Delaware Engineers, Inc., dated December 3, 1974, a copy of 
the pertinent portion of which is attached hereto as Exhibit 11. Said lots 
are particularly described as follows:

                         SEE ATTACHED PLOT OF LANDS OF
                        SUSSEX COUNTY INDUSTRIAL AIRPARK

                                  [OMITTED]

     2.  Landlord agrees that the Tenant, its servants, employees, agents and 
business invitees shall have at all times the free and uninterrupted rights of 
access to the said leased



property.

     3.  It is mutually agreed by the parties hereto that the term of this 
lease shall be for a period of Forty (40) years, commencing on the 1st day of 
January, A.D. 1982, and terminating on the 31st day of December, A.D. 2021, 
both dates inclusive unless sooner terminated as provided herein; provided 
however, that the term of this lease may be extended for four (4) additional 
five (5) year periods, the first of said five (5) year periods commencing on 
the 1st day of January, A.D. 2022, and terminating on the 31st day of 
December A.D. 2026, the second such five (5) year period commencing on the 
1st day of January, A.D. 2027, and terminating on the 31st day of December 
2031, the third such five (5) year period commencing on the 1st day of 
January, A.D. 2032 and terminating on the 31st day of December, A.D. 2038 and 
the fourth such five (5) year period commencing on the 1st day of January, 
A.D. 2037, and terminating on the 31st day of December, A.D. 2041, unless 
written notice is given by the Tenant hereto to the Landlord hereto, at its 
last known address, that this lease shall not be so extended by Registered or 
Certified Mail with return receipt requested on or before the 30th day of 
September, A.D. 2021, or similar date not less than ninety (90) days prior 
to the expiration of any such five (5) year extension period, if this lease 
is extended for any additional five (5) year period.

     4.  Tenant agrees to pay to Landlord annual rental for the term of this 
lease, or any renewal or extension thereof, at the rate of $200.00 per acre, 
i.e., the sum of $6,125.20 per year in quarterly, semi-annual or annual 
installments, in advance, as selected by Tenant, which said method of payment 
may be changed from time to time during the term of this lease or any renewal 
or extension thereof, the first of said rental payments to be due on the 1st 
day of January, A.D. 1982. Tenant agrees to pay the rental at the Office of 
the Director of Finance, or



its successor, at the Court House in Georgetown, Sussex County, Delaware, or at
such other place or places as the Landlord may designate in writing. Failure of
the Tenant to pay to Landlord the annual rental referred to herein shall not be
construed as a default of lease unless the Landlord shall have given fifteen
(15) days' written notice to the Tenant, at its last known address, then this
lease shall be terminated by reason of said default.

          5.   Tenant agrees, in addition to the fixed rental provided for
herein, to pay all lawful taxes made upon the buildings and improvements erected
or to be erected upon the premises which are lawfully assessed during the term
of this lease or any renewal or extension thereof.

          6.   Landlord agrees that Tenant may use and occupy the said leased 
premises for any lawful purpose. Tenant agrees not to use or knowingly permit 
any part of the said leased premises to be used for any unlawful purpose. 
Landlord agrees that Tenant may erect upon the said leased premises a 
building or buildings suitable to the use of Tenant and may, in addition, 
alter, add to, or improve such building so constructed by Tenant. Tenant 
shall have the right at any time to terminate this Lease Agreement, if after 
entering into this Lease Agreement, it is unable to secure all necessary 
governmental approvals required to carry on the various aspects of its 
business, or if after securing all such approvals, one or more of such 
approvals are rescinded, expire or otherwise rendered void thereby preventing 
or interfering with Tenant's use of the leased premises for this intended 
purpose.

          7.   Landlord agrees that Tenant may place or erect on any part of the
said leased premises a flat sign of reasonable size bearing the trade name of
Tenant.

          8.   The Landlord shall at all times under the terms hereof maintain
the Sussex County Industrial Airpark as an active airport facility in compliance
with the regulations of the Federal Aviation Administration.



          9.   Tenant agrees that Landlord shall not be required to furnish 
to Tenant any facilities or services of any kind, such as, but not limited 
to, steam, heat, gas, hot water, electricity, light, or power, except as 
provided in this lease. Landlord represents, however, that electricity, 
sanitary sewers and water are available within this Industrial Airpark and 
will be brought to the site at no expense to Tenant.

          10.  Tenant agrees during the term of this lease or any
renewal or extension thereof, to comply with all laws, ordinances, lawful orders
and regulations issued by any governmental authority which affect the said
leased premises.

          11.  The Tenant shall have the right to assign this lease together
with all the rights of the Tenant hereunder or enter into a sublease with
Landlord's consent, subject to the following conditions:

               (a)  At the time of said proposed assignment or sublease, this
          lease shall be in full force and effect.

               (b)  The Landlord shall be given written notice of such proposed
          assignment or sublease not less than forty-five (45) days prior to the
          effective date thereof. Landlord shall immediately investigate the
          proposed new tenant to ascertain such proposed tenant's capabilities
          to carry out a business consistent with the policies and objectives
          established by Landlord for all tenants in the Airpark. Landlord shall
          not unreasonably withhold consent of any proposed assignment or
          sublease and in the event consent is not granted, Tenant shall be
          advised in writing of the specific reasons for such rejection. Failure
          of Landlord to grant or deny consent (in writing) within forty-five
          (45) days from receipt of notice of such proposed assignment or
          sublease shall constitute the granting of the required consent.

               (c)  Such assignment or sublease shall be in 



          writing duly executed and acknowledged in proper form for recording,
          and shall be recorded within ten (10) days after execution and
          delivery thereof.

               (d)  A duplicate original or certified copy of such assignment or
          sublease together with the recording date shall be furnished to the
          Landlord within ten (10) days after the return thereof from the Office
          of the recorder.

               (e)  any assignee or sublessee shall assume this lease by
          written instrument, a duplicate original of which shall be furnished
          to the Landlord within ten (10) days after the effective date of such
          assignment or sublease.

          Upon making an assignment or sublease, in compliance with the
conditions of this paragraph, the Tenant shall be released and relieved of all
further liability under this lease from and after the effective date of such
assignment or sublease, and each subsequent assignee or sublessee, upon making a
further assignment or sublease in compliance with the conditions of this
paragraph, shall be released and relieved of all further liability under this
lease from and after the effective date of such further assignment or sublease.

          The Landlord specifically consents to the sublease of this Lease to
Thomas Gollicker, Harry B. Helmsley and Leona Helmsley, or to a new corporation
composed of the foregoing. This specific consent shall not be construed as a
waiver to the right to consent that a further assignment or sublease hereunder.

          12.  Tenant agrees that no building nor any addition or alteration
thereto shall exceed One Hundred (100) feet above existing ground level.

          13.  Landlord agrees to furnish to Tenant water for general use and 
fire protection and sanitary sewage and storm 



water drainage services from the facilities constructed by Landlord at least to
the property line of the premises described herein.  Tenant agrees that the
expense of connection, the furnishing of any water meters, pipe and
appurtenances from the property line of Tenant to any improvement erected in
said leased premises shall be an expense of Tenant and shall be installed
pursuant to the requirements of Landlord and any lawful regulations issued by
Landlord pursuant thereto.

     14.  Landlord agrees that all charges for water and sanitary sewer services
to Tenant will be at the rates charged for all other tenants at Sussex County
Industrial Airpark.  Tenant agrees that the strength and characteristics of all
waste water discharged into the sanitary sewer facilities of Landlord shall be
within the limits stated on "Waste Water Quantity and Quality Criteria" which is
attached hereto as Exhibit "A" and made a part of this lease by reference as
though fully set forth herein.

     15.  Landlord agrees, covenants and represents as follows:

          (a)  That there presently exists and there shall exist during the term
     of the lease and extensions thereof no real property taxes assessed,
     levied, placed or charged against the land herein relevant, provided,
     however, that Tenant is responsible and liable for all real estate tax
     relating to buildings and improvements which may be constructed upon said
     land.  Landlord shall pay and be responsible for any real property tax that
     shall be assessed, levied, placed or charged against the land herein
     relevant.

          (b)  That the Tenant, its servants, employees, agents and invitees
     shall at all times during the term of this lease and any renewal thereof,
     have free and uninterrupted right of access (over paved roadways) to the
     premises herein relevant for all varieties and



     types of vehicular traffic and movement.  Landlord agrees, at no expense to
     Tenant to provide and maintain all taxiways and roadways required to afford
     such access to the leased premises from nearby public highways and roads. 
     The taxiway immediately adjoining the easterly side of the demised premises
     shall be included herein, notwithstanding the fact that this property has
     been designated as part of the demised premises for parking and other
     purposes within paragraph 1.

          (c)  That the premises herein relevant is owned in fee simple by the
     Landlord and that the premises herein relevant is free from any
     encumbrances of any type.

          (d)  That the Landlord has the right to make this lease and that it
     will execute or procure any further assurances of title that may be
     required by the Tenant.

          (e)  That telephone and electric service is and will be available to
     the Tenant from facilities constructed at least to the property line of the
     premises described herein by Landlord or parties other than Tenant.

          (f)  That, subject to the agreement with the current fixed base
     operator, none of the following categories of aviation businesses will be
     permitted at the Sussex County Industrial Airpark during the time of this
     lease:

     A.   Aircraft Completion Center comprised of any of the following
          capabilities:

          1.   Paint Shop (painting aircraft).
          2.   Aircraft Metal Shop.
          3.   Aircraft Wood/Custom Cabinet Shop.
          4.   Aircraft Avionics Maintenance Shop.
          5.   Aircraft Avionics Sales and/or Installation Department.
          6.   Aircraft Upholstery Department/Shop.


     B.   Aircraft Maintenance Facility that caters to aircraft powered by
          either Turbo Prop or Jet Engine/Engines.

     C.   Aircraft Brokerage Business addressing the Turbo Prop/Jet Market.

     D.   Jet/Turbo Aircraft Charter Business (FAA Part 121, 135 or 135.1
          Operation).

     E.   Major Aircraft Part Supply Business that addresses the Turbo Prop Jet
          Aircraft.

     F.   Airplane/Aircraft Manufacture.  This would be a company/partnership or
          single proprietorship that would design, build and market any type of
          aircraft.

     16.  Upon the termination of this lease, Tenant shall have the right to
sell any improvements and buildings located on the leased premises, provided
such sale is entered into and Landlord so notified within one hundred fifty
(150) days following termination of this lease.  Landlord agrees that it will
offer to and enter into a new lease with the individual or entity to whom Tenant
sells, of up to twenty (20) years with three consecutive ten (10) year options
of renewal, at the option of the purchasing individual or entity, or in the
alternative, if Tenant determines not to sell but to remain in possession, will,
at the option of Tenant, enter into a new lease with Tenant of up to twenty (20)
years with three consecutive ten (10) year options of renewal.  Any such new
lease with a purchaser from tenant or with Tenant shall be at the then current
rental rates being charged by Landlord for vacant properties within the Airpark,
and upon such terms and conditions as are then governing the leasing of
properties in the Airpark.  It is understood, however, that Tenant shall not be
permitted to so sell to any party without the prior written consent of Landlord
which shall not be unreasonably withheld.  Consent shall not be denied unless it
is established upon investigation by Landlord that the proposed purchaser
(prospective new Tenant) does not have the capabilities of carrying out a
business consistent with the then current policies and objectives established by
Landlord for all tenants in this Industrial Airpark.



          17.  Tenant shall have the right to encumber or mortgage or assign its
interest in this lease in connection with securing the financing required to
improve the leased premises as planned by Tenant to house its operations, and
any buildings or improvements on such premises may be so encumbered or
mortgaged. The Landlord shall enter into such consents, attornments, notice
requirements, nondisturbance agreements, subordination and estoppel agreements,
or other similar reasonable requirements as are necessary to effect the
leasehold mortgage permitted herein.

          18.  Tenant agrees during the term of this lease or any renewal or
extension thereof, that any destruction or damage to any building or improvement
on the said leased premises by fire, windstorm or any other casualty shall not
entitle Tenant to surrender possession of the said leased premises or to
terminate this lease or to violate any of its provisions or to cause any rebate
or abatement in rent then due or thereafter becoming due under the terms hereof.

          19.  It is mutually agreed between the parties hereto that any
improvement erected on the premises for and during the term of this lease or any
renewal or extension thereof shall be deemed to be personal property and may be
removed by Tenant or any assignee or Tenant within One hundred fifty (150) days
following the termination of this lease either by expiration of time or other
reason; provided, however, that no substantial damage to the freehold 
results; and provided further that upon the failure of Tenant or any assignee 
of Tenant to remove any improvements so erected within the said One hundred 
fifty (150) day period, such improvement or portion thereof left upon the 
said leased premises shall be determined to be abandoned and shall not be 
removed therefrom and shall become the property of Landlord, subject, however, 
to the provision of paragraph 16 of this Agreement of Lease. Tenant agrees 
that any such removal shall be accomplished at the expense of Tenant and not 
at any



expense or liability of Landlord. Tenant agrees to pay to Landlord rental at 
the rate set forth in paragraph 4 hereof for the number of days after the 
termination of this lease that Tenant does not remove the improvements from 
the premises or does not give notice to Landlord that the improvements are 
not to be removed or the One hundred fifty (150) day period expires, 
whichever first occurs.

          20.  In the event Landlord elects to sell the leased premises (Lots 
1 through 7, inclusive) as a separate parcel of land during the term of this 
Lease Agreement, or any renewal or extension thereof, including a renewal 
resulting from rights conferred by paragraph 16, above, Landlord agrees that 
it shall first offer to sell the premises to Tenant upon the same terms and 
conditions it is prepared to sell to a third party purchaser. This right of 
first refusal shall not be applicable in the event Landlord elects to sell 
the leased premises, plus additional properties within this Industrial 
Airpark (or the entire Airpark) as a single transaction for a single purchase 
price.

          21.  It is mutually agreed by the parties hereto that any notice 
under this lease shall be in writing and must be sent by Registered or 
Certified Mail to the last address of the party to whom the notice is to be 
given, as designated by such party in writing. Landlord hereby designates its 
address as County Administrator, Court House, Georgetown, Delaware, 19947. 
Tenant hereby designates its address as P. O. Box 521, Georgetown, Delaware, 
19947, and a carbon copy to its attorney, Warner D. Norton, Esquire, 60 East 
42nd Street, Suit 1517, New York, New York, 10165.

          22.  It is mutually agreed by the parties hereto that the terms 
"Landlord" and "Tenant" shall refer to and bind not only the parties hereto 
but also their respective successors and assigns.

          23.  This lease shall be subject and subordinate to no lien of any 
kind now or hereafter placed on the land and



buildings of which the leased premises form a part.

          24.  Throughout the term of this lease, the Tenant shall pay all 
premiums for insurance coverage on the leased property, including fire and 
windstorm insurance, in such amounts as may be required by the Landlord and 
with such companies as the Tenant may choose, subject to Landlord's approval. 
The Tenant shall indemnify the Landlord against all liabilities, expenses, 
and losses incurred by the Landlord as a result of (a) failure by Tenant to 
perform any covenant required to be performed by the Tenant hereunder; (b) 
any accident, injury, or damage which shall happen in or about the leased 
property or appurtenances, or resulting from the condition, maintenance, or 
operation of the leased property; (c) failure to comply with any requirements 
of any governmental authority; and (d) any mechanic's lien, or security 
agreement, filed against the leased property, any equipment therein, or any 
materials used in the construction or alteration of any building or 
improvement thereon.

          25.  The terms, conditions, covenants and provisions of this lease 
shall be deemed to be severable. If any clause or provision herein contained 
shall be adjudged to be invalid or unenforceable by a court of competent 
jurisdiction or by operations of any applicable law, it shall not affect the 
validity of any other clause or provision herein, but such other clauses or 
provisions shall remain in full force and effect. The Landlord may pursue the 
relief or remedy sought in any invalid clause, by conforming the said clause 
with the provisions of the statutes or the regulations of any governmental 
agency in such case made and provided as if the particular provisions of the 
applicable statute or regulations were set forth herein at length.

          26.  In all reference herein to any parties, person, entities or 
corporations, the use of any particular gender or the plural or singular 
number is intended to include the appropriate gender or number as the text of 
the within instrument may require. All the terms, covenants and conditions 
herein



contained shall be for and shall inure to the benefit of and shall bind the 
respective parties hereto, and their heirs, executors, administrators, 
personal or legal representatives, successors and assigns.

          IN WITNESS WHEREOF, the parties hereto have caused this Agreement 
to be executed by their proper officers and their corporate seals to be 
hereunto affixed, the day and year first above written.

                                          SUSSEX COUNTY



APPROVED AS TO FORM:                      BY  /s/ Olway I. Hill
                                          -------------------------------------
                                              President of County Council


BY /s/ Heinrich Schraoker                 ATTEST  /s/ Emogene Elks
  --------------------------------------        ----------------------------
        Acting County Attorney                     Clerk of County Council



                                          GEORGETOWN AIRCRAFT SERVICES, INC.


                                          BY  /s/ Thomas Gollicker
                                          -------------------------------------
                                              Thomas Gollicker        President

                                          ATTEST  /s/ Warner Harte
                                          -------------------------------------
               [STAMP]                            Warner Harte  Asst. Secretary



                              FIRST AMENDMENT OF LEASE
                                          
          THIS FIRST AMENDMENT OF LEASE is made and entered this 13th day of 
August, 1997, by and between Sussex County, a political subdivision of the 
State of Delaware, and Pats, Inc., a Maryland corporation.

          WHEREAS, Sussex County, as Landlord, and Georgetown Aircraft 
Services, Inc., as Tenant, entered into an Agreement of Lease, dated January 
12, 1982, for approximately 30.626 acres of land in the Sussex County 
Industrial Airport, Sussex County, Delaware (the "Lease");

          WHEREAS, Georgetown Aircraft Services, Inc., as Seller and Pats, 
Inc., as Buyer, have entered into an Asset Purchase Agreement, dated August 
13, 1997, providing for, in part, for the assignment of the Lease from 
Georgetown Aircraft Services, Inc., to Pats, Inc. (the "Asset Purchase 
Agreement") pursuant to an Assignment and Assumption Agreement to be executed 
by Seller and Buyer immediately prior hereto; and 

          WHEREAS, Sussex County has the right, under certain circumstances, 
to not consent to the assignment of the Lease; and 

          WHEREAS, Sussex County has agreed to consent to the assignment of 
the Lease from Georgetown Aircraft Services, Inc. to Pats, Inc. provided that 
there are certain amendments to the Lease, which amendments Pats, Inc. has 
agreed to accept in exchange for Sussex County's consent to the assignment of 
the Lease and other consideration to be provided by Sussex County to Pats, 
Inc.

          NOW THEREFORE, in consideration of the mutual covenants hereinabove 
and hereinafter expressed, the parties hereto agree as follows:



1.   Subparagraph 15(f)(A.)-(F.) of the Lease is deleted.

2.   The following language is added as paragraph 27 of the Lease:

     "27. Tenant shall not schedule any arrivals or departures of aircraft for 
     hours between 11:00 p.m. and 6:00 a.m."

3.   The following language is added as paragraph 28 of the Lease:

     "28. Notwithstanding the provisions of paragraphs 1 and 3 of the Lease 
     regarding a description of the leased premises and the term of the 
     Lease, respectively, the Landlord and Tenant agree, notwithstanding an 
     extension of the lease by Tenant beyond December 31, 2021, as provided 
     for in paragraph 3 of the Lease, that any of the lots which are part of 
     the leased premises and are not either developed or subleased by the 
     Tenant to a Subtenant or Subtenants, that such lots shall automatically 
     revert back to the Landlord on December 31, 2021, and not be deemed to 
     be a part of the leased premises after December 31, 2021."

4.   The following language is added as paragraph 29 of the Lease:

     "29. Tenant shall pay a fee to Landlord of an amount equal to five percent
     (5.0%) of the gross annual rent on each sublease that the Tenant enters 
     into with a Subtenant, which fee shall be due by Tenant to Landlord on 
     January 15 for the preceeding six (6) months, and July 15 for the 
     preceding six (6) months. The Landlord may, at its own expense and upon 
     reasonable notice to tenant, audit Tenant's records for the purpose of 
     verifying the accuracy of the payments to be made by Tenant to Landlord 
     hereunder.

5.   The following language is added as paragraph 30 of the Lease:

     "30. Tenant shall pay to Landlord a fee equal to ten cents ($.10) per 
     gallon on the first 100,000 gallons of fuel sold by Tenant to its 
     customers each year and eight cents ($.08) per gallon on each 
     gallon of fuel in excess of 100,000 gallons of fuel sold by 
     Tenant to its customers each year, which fee shall be due on 
     January 15 for the preceding six (6) months, and July 15 for the 
     preceding six (6) months. The Landlord may, at its own expense 
     and upon reasonable notice to tenant, audit Tenant's records for 
     the purpose of verifying


                                       2


          the accuracy of the payments to be made by Tenant to Landlord
          hereunder.

     6.   The following language is added to paragraph 6 of the Lease between 
the existing first and second sentences of paragraph 6.

          "Lawful purpose shall mean any lawful purpose that is related to (1)
          lawful aviation uses of any kind, or (2) lawful manufacturing uses of
          any kind."

     7.   The following language is added to the end of paragraph 11:

          "The Landlord specifically consents to the sublease of this Lease to
          an entity wholly-owned by Pats, Inc.  This specific consent shall not
          be construed as a waiver to the right to consent to a further
          assignment or sublease hereunder."

     8.   Exhibit "A" to paragraph 14 of the Lease, which is titled "Waste 
Water Quantity and Quality Criteria" is deleted and replaced with a new 
Exhibit "A" titled "Waste Water Quantity and Quality Criteria dated July 1, 
1997."

     9.   Sussex County hereby consents to the assignment of Georgetown 
Aircraft Services, Inc.'s right, title and interest in the Lease, as Tenant, 
to Pats, Inc.

     IN WITNESS WHEREOF, the parties hereto have caused this First Amendment 
of Lease to be executed by their proper officers and their corporate seals to 
be hereunto fixed the day and year first above written.

                           [SIGNATURE LINE TO FOLLOW]

                                       3


                                       Sussex County

Approved As to Form:

/s/                                    By: /s/ Dale R. Dukes
- -----------------------------             -------------------------------
Sussex County Attorney                      President of Sussex County Council


                                       Attest:

                                       /s/ Robin A. Griffith
                                       ----------------------------------
                                        Clerk of Sussex County Council

                                       PATS, INC.
         
                                       By: /s/ Larry D. Ohler
                                       ----------------------------------
                                                 Vice President



                                       4