AMERICAN AIRCARRIERS SUPPORT INC
8-K, 1999-09-17
INDUSTRIAL MACHINERY & EQUIPMENT
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<PAGE>   1
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549


                                    FORM 8-K

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

                                 CURRENT REPORT
                     PURSUANT TO SECTION 13 OR 15(d) OF THE
                         SECURITIES EXCHANGE ACT OF 1934



                Date of Report (Date of Earliest Event Reported):
                                  APRIL 1, 1999


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


                   AMERICAN AIRCARRIERS SUPPORT, INCORPORATED
             (Exact name of registrant as specified in its charter)



<TABLE>
<S>                           <C>                         <C>
         DELAWARE                    0-24275                  52-2081515
 (State of Incorporation)     (Commission File No.)        (I.R.S. Employer
                                                          Identification No.)
</TABLE>


                          587 GREENWAY INDUSTRIAL DRIVE
                             LAKEMONT BUSINESS PARK
                         FORT MILL, SOUTH CAROLINA 29715
                    (Address of principal executive offices)



                                 (803) 548-2160
              (Registrant's telephone number, including area code)



<PAGE>   2


ITEM 5.       ACQUISITION OR DISPOSITION OF ASSETS

              On April 1, 1999, American Aircarriers Support, Incorporated (the
"Company") completed the acquisition of substantially all of the operating
assets of Complete Controls, Inc. ("CCI") pursuant to an Asset Purchase
Agreement (the "Agreement") dated as of April 1, 1999 among the Company,
American Aircarriers Support Acquisition IV Corp., a wholly owned subsidiary of
the Company formed for the purpose of effecting the acquisition (the
"Subsidiary"), the Company, CCI, and Micah Chapman, Glen Hiscox and Frank Zambo,
the shareholders of CCI (the "Shareholders"). Pursuant to the Agreement, the
Company acquired substantially all of the assets of CCI for a purchase price
$600,000, comprised of cash paid from working capital, issuance of a promissory
note, and assumption of certain liabilities. CCI is a FAA-certified maintenance,
repair and overhaul facility specializing in flight control surfaces such as
flaps, slats and rudders.

         Simultaneously with the execution of the Agreement, the Company entered
into a three year employment agreement with Mr. Chapman and Mr. Zambo. Under
their respective agreements, Mr. Chapman is to serve as President of the
Subsidiary and Mr. Zambo is to serve as Vice President of the Subsidiary. The
Subsidiary will continue to operate the business previously operated by CCI.
These gentlemen have a combined 30 years' experience in the aircraft industry.
Prior to founding CCI in late 1996, both of these Shareholders were employed by
Lockheed Martin.

         Simultaneously with the execution of the Agreement, the Company assumed
CCI's existing leases with the Tucson Airport Authority, Inc. for approximately
38,400 square feet of hangar space, 3,500 square feet of office space and
designated areas adjacent to the hangar space at the Tucson International
Airport in Tucson, Arizona. The Company recently leased an additional building
at the Tucson International Airport containing 75,600 square feet.

FORWARD LOOKING STATEMENTS

         This Report on Form 8-K may contain forward-looking statements. When
used in this report, the words "may," "will," "expect," "anticipate,"
"continue," "estimate," "project," "intend," "believe" and similar expressions,
variations of these words or the negative of those words are intended to
identify forward-looking statements within the meaning of Section 27A of the Act
and Section 21E of the Securities Exchange Act of 1934 regarding events,
conditions and financial trends including, without limitation, business
conditions in the aviation services industry and the general economy, and other
risks or uncertainties detailed in other of the Company's Securities and
Exchange Commission filings. Such statements are based on management's current
expectations and are subject to risks, uncertainties and assumptions. Should one
or more of these risks or uncertainties materialize, or should underlying
assumptions prove incorrect, the Company's actual plan of operations, business
strategy, operating results and financial position could differ materially from
those expressed in, or implied by, such forward-looking statements.




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<PAGE>   3



ITEM 7.       FINANCIAL STATEMENTS AND EXHIBITS

              (a) Financial statements relative to CCI are not required pursuant
to Item 310(c) and (d) of Regulation S-B.

              (b) Pro forma financial information relative to CCI and the
Registrant are not required pursuant to Item 310(c) and (d) of Regulation S-B.

              (c) The following exhibits are furnished herewith in accordance
with the provisions of Item 601 of Regulation S-B:

<TABLE>
<CAPTION>
                                                                                                          Reg. S-B
Exhibit No.                         Description                                                           Item No.
- -----------                         -----------                                                           --------
<S>                 <C>                                                                                   <C>
  2.5               Asset Purchase Agreement among the Company, American Aircarriers                          2
                    Support Acquisition IV Corp., Complete Controls, Inc., Micah Chapman
                    and Frank Zambo
10.1.8              Employment Agreement between the Company and Micah Chapman                               10
10.1.9              Employment Agreement between the Company and Frank Zambo                                 10
10.5.10             Lease Agreement between Complete Controls Inc. and Tucson Airport                        10
                    Authority, Inc.
10.5.11             Lease Agreement between Complete Controls Inc. and Tucson Airport                        10
                    Authority, Inc.
10.5.12             Lease Agreement between AAS-Complete Controls Inc. and Tucson                            10
                    Airport Authority, Inc.
</TABLE>



                                   SIGNATURES

         Pursuant to the requirements of the Securities Exchange Act of 1934,
the Registrant has duly caused this report to be signed on its behalf by the
undersigned hereunto duly authorized.


                                AMERICAN AIRCARRIERS SUPPORT, INCORPORATED


Date: September 16, 1999        By: /s/ Elaine T. Rudisill
                                    -------------------------------------------
                                    Elaine T. Rudisill, Chief Financial Officer




                                        3

<PAGE>   4



                                  EXHIBIT INDEX


<TABLE>
<CAPTION>
                                                                                                          Reg. S-B
Exhibit No.                         Description                                                           Item No.
- -----------                         -----------                                                           --------
<S>                 <C>                                                                                   <C>
  2.5               Asset Purchase Agreement among the Company, American Aircarriers                          2
                    Support Acquisition IV Corp., Complete Controls, Inc., Micah Chapman
                    and Frank Zambo
10.1.8              Employment Agreement between the Company and Micah Chapman                               10
10.1.9              Employment Agreement between the Company and Frank Zambo                                 10
10.5.10             Lease Agreement between Complete Controls Inc. and Tucson Airport                        10
                    Authority, Inc.
10.5.11             Lease Agreement between Complete Controls Inc. and Tucson Airport                        10
                    Authority, Inc.
10.5.12             Lease Agreement between AAS-Complete Controls Inc. and Tucson                            10
                    Airport Authority, Inc.
</TABLE>




                                        4


<PAGE>   1
                                                                     EXHIBIT 2.5

                            ASSET PURCHASE AGREEMENT


         THIS ASSET PURCHASE AGREEMENT is made and entered into as of the 1st
day of April, 1999, by and among COMPLETE CONTROLS, INC., an Arizona corporation
("Seller"), MICAH CHAPMAN, GLEN HISCOX and FRANK ZAMBO (collectively referred to
as "Shareholders") and AMERICAN AIRCARRIERS SUPPORT ACQUISITION IV CORP. (the
"Purchaser"), a Arizona subsidiary of AMERICAN AIRCARRIERS SUPPORT,
INCORPORATED, a Delaware corporation ("AASI").

                             W I T N E S S E T H:

         WHEREAS, the Seller is engaged in the business of maintaining,
overhauling, supplying and redistributing aircraft flight controls and
associated parts to commercial and cargo airlines.

         WHEREAS, the Shareholders own one hundred percent (100%) of the
outstanding shares of Seller.

         WHEREAS, the Seller desires to sell and the Purchaser desires to
purchase substantially all the operating assets and properties used in the
business operations of Seller under the terms set forth herein.

         NOW, THEREFORE, the parties hereto agree that the purpose of this
Agreement is to set forth the terms and conditions upon which the Seller has
agreed to sell to the Purchaser certain of its business and assets; and the
Purchaser has agreed to purchase and pay for such business and assets; and
furthermore, the Seller and the Purchaser in consideration of the premises and
the mutual agreements contained herein, do hereby agree as follows:

                                    ARTICLE I

                           PURCHASE AND SALE OF ASSETS

         Section 1.1 Assets to be Purchased and Sold.

         (a) Description of Assets. At the Closing (as defined in Section 1.2),
the Seller shall sell and convey to the Purchaser, and the Purchaser shall
purchase and acquire from the Seller, substantially all the business and assets
of the Seller existing and owned by the Seller or used by the Seller in Seller's



<PAGE>   2


business on the Closing Date (as defined in Section 1.2) relating to Seller's
business, other than the Excluded Assets (as defined in Section 1.1(b)). The
assets of the Seller to be purchased hereunder (which shall not include the
Excluded Assets) are referred to herein as the "Subject Assets," and shall
include without limitation:

                  (i) all the Seller's inventory described on Exhibit 1.1(a)(i);

                  (ii) all the Seller's rights to prepaid license fees,
         deposits, prepaid lease expenses and other rights acquired under any
         leases, other than Excluded Assets (the "Prepaid Expenses"). The Seller
         shall prepare a detailed listing of such Prepaid Expenses as of the
         Closing Date which shall be included as Exhibit 1.1(a)(ii) hereto;

                  (iii) all furniture, fixtures, furnishings, tools, equipment,
         supplies, parts, accessories, inventories, machinery, shelving,
         computer equipment, signage, and other tangible personal property of
         the Seller other than Excluded Assets (the "Tangible Property"),
         including without limitation the items of Equipment and other Tangible
         Property described on Exhibit 1.1(a)(iii) hereto and any additions or
         accessions thereto or substitutions therefor or proceeds thereof;

                  (iv) to the extent Purchaser desires to acquire the same, all
         rights of the Seller under all contracts, service agreements,
         advertising agreements, sales contracts, customer orders, leases,
         licenses, and agreements other than Excluded Assets (the "Contracts"),
         including without limitation the Seller's rights existing on the
         Closing Date under the Contracts described or referred to in Exhibit
         1.1(a)(iv) hereto;

                  (v) (A) all rights of the Seller in the name "Complete
         Controls, Inc." and any trademarks, tradenames or service marks, and
         all registrations thereof and pending applications therefor, in
         connection therewith (the "Name"), and (B) all other tradenames,
         trademarks, service marks, copyrights, licenses, proprietary rights and
         technology,




                                        2

<PAGE>   3





         patents and registrations thereof or applications therefor, and trade
         secrets, secret processes (whether or not patentable), supplies and
         vendor lists, customer lists, software, inventions (whether or not
         patentable), formulae and other property belonging to, used in or
         appertaining to the Seller's Subject Assets, all as described on
         Exhibit 1.1(a)(v) hereto (collectively, with the Name, the
         "Intellectual Property");

                  (vi) books, records, ledgers, files, documents,
         correspondence, lists, prints, plans, drawings, and specifications,
         creative materials, advertising and promotional materials, studies,
         reports, and other printed or written materials directly related to
         Seller's business other than Excluded Records (as defined in subsection
         1.1(b)(ii) (the "Records");

                  (vii) all the Seller's federal, state and local governmental
         permits, licenses, and approvals required for the conduct of its
         business (or held with respect to the assets and operations of the
         business of the Seller) to the extent assignment thereof to the
         Purchaser is permitted by applicable law (the "Licenses"), all as
         described on Exhibit 1.1(a)(vii) hereto; and

                  (viii) all the Seller's work-in-process as described on
         Exhibit 1.1(a)(viii); and

                  (ix) all accounts receivables owned by Seller at Closing and
         listed on Exhibit 1.1(a)(ix).

         (b) Excluded Assets. The assets to be purchased and sold hereunder, and
the term "Subject Assets" as used herein, shall not include the following assets
of the Seller existing on the Closing Date (the "Excluded Assets"):

                  (i) The Seller's cash balances as of Closing and any passive
         investments of Seller as identified on Exhibit 1.1(b)(i).

                  (ii) The Seller's corporate minute books, stock records and
         income tax records, and other records of the Seller




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<PAGE>   4





         relating exclusively to Excluded Assets (the "Excluded Records"),
         however with regard to tax return and financial statement information,
         Purchaser shall have access to such information, including all
         accounting work papers, for the last three (3) years to the extent the
         same are related to the Seller's business being acquired hereunder as
         may be periodically requested;

                  (iii) The Seller's tax prepayments.

                  (iv) The personal property listed on Exhibit 1.1(b)(iv).

         Section 1.2 Closing Date. The closing date (the "Closing Date") shall
be April 1, 1999, or such other date as may be mutually agreed to by the
parties. The closing of this transaction (the "Closing") shall be held at the
offices of David M. Furr, Gray, Layton, Kersh, Solomon, Sigmon, Furr & Smith,
P.A., Gastonia, North Carolina, or such other place as the parties may mutually
agree. At the Closing, subject to the fulfillment or waiver of the conditions
set forth in Article V, the Seller shall convey the Subject Assets to the
Purchaser by appropriate instruments of transfer and the Purchaser shall pay to
the Seller the Purchase Price as provided in Sections 1.3 and 1.4.

         Section 1.3 Purchase Price. The final purchase price, subject to any
working capital adjustments, to be paid to the Seller for the Subject Assets
(the "Purchase Price") shall be an amount equal to Six Hundred Thousand Dollars
($600,000.00). The Purchase Price shall be subject to a minimum working capital
adjustment based on the financials of the Seller dated December 31, 1998.
Accounts receivable, inventory, accounts payable and accrued liabilities, credit
card payables, shareholder loans payables, accrued benefits and payroll, sales
tax liability and work-in-process are to be included in this calculation of a
working capital adjustment.

         Section 1.4  Payment of Purchase Price.  The Purchase Price
shall be payable by the Purchaser over two (2) years in the
amounts set forth on Exhibit 1.4.  At Closing, Purchaser shall
give to Seller a down payment of One Hundred Fifty Thousand




                                        4

<PAGE>   5



Dollars ($150,000.00) and a Promissory Note in the amount and form set forth on
Exhibit 1.4.

         Section 1.5 No Liabilities Assumed; Liabilities of the Purchaser After
Closing. The Purchaser is not assuming any of the Seller's liabilities or
obligations, whether known or unknown, contingent or realized, except as
provided on Exhibit 1.5; provided, however, all liabilities incurred after the
Closing in connection with the Purchaser's operations after the Closing shall be
liabilities of the Purchaser.

                                   ARTICLE II

          REPRESENTATIONS AND WARRANTIES OF THE SELLER AND SHAREHOLDERS

         To induce the Purchaser and AASI to enter into this Agreement and to
purchase the Subject Assets, the Seller and Shareholders (excluding Glen Hiscox)
jointly and severally, represent and warrant that the statements contained in
this Article II are correct and complete as of the Closing Date, except as set
forth in the disclosure schedule accompanying this Agreement and initialed by
the Parties (the "Disclosure Schedule").

         Section 2.1 Organization of the Seller. The Seller is a corporation
duly organized, validly existing and in good standing under the laws of the
jurisdiction of Arizona.

         Section 2.2  Subsidiaries and Foreign Qualification.

         (a) Subsidiary. The Seller has no subsidiaries and no other equity
investments in any other corporation, partnership, joint ventures or other
business entity.

         (b) Foreign Qualification. The Seller has qualified to transact
business as a foreign corporation in the following jurisdictions as indicated on
Exhibit 2.2, and the nature and location of the Seller's business and assets is
such that no further qualification is required.

         Section 2.3  Authorization of Transaction.  The Seller has full power
and authority (including full corporate power and




                                        5

<PAGE>   6


authority) to execute and deliver this Agreement and to perform its obligations
hereunder. This Agreement constitutes the valid and legally binding obligation
of the Seller and Shareholders, enforceable in accordance with its terms and
conditions.

         Section 2.4 Noncontravention. Neither the execution and the delivery of
this Agreement, nor the consummation of the transactions contemplated hereby,
will (i) violate any statute, regulation, rule, judgment, order, decree,
stipulation, injunction, charge, or other restriction of any government,
governmental agency, or court to which the Seller is subject or any provision of
the charter or bylaws of the Seller or (ii) conflict with, result in a breach
of, constitute a default under, result in the acceleration of, create in any
party the right to accelerate, terminate, modify, or cancel, require any notice
under any contract, lease, sublease, license, sublicense, franchise, permit,
indenture, agreement or mortgage for borrowed money, instrument of indebtedness,
security interest, or other arrangements to which the Seller is a party or by
which it is bound or to which any of its assets is subject, except with respect
to the required third party consents identified on Section 2.4 of the Disclosure
Schedule. Seller does not need to give any notice to, make any filing with, or
obtain any authorization, consent, or approval of any governmental or
governmental agency in order for the parties to consummate the transactions
contemplated by this Agreement, except notice required to be given to the
Federal Aviation Administration.

         Section 2.5 Financial Statements; Books and Records. Seller has
delivered to Purchaser and AASI financial statements of Seller for the year
ended December 31, 1997 and December 31, 1998 (together the "Financial
Statements") attached herein as Exhibit 2.5(a). The Financial Statements present
fairly the financial position of Seller as at such dates and the results of
operations for the periods then ended, except that the Financial Statements are
subject to normal year-end adjustments. The Financial Statements are correct and
complete and are consistent with the books and records of the Seller.

         Except for Exhibit 2.5(b), none of the records, systems, data or
information of the Seller is recorded, stored, maintained, operated or
otherwise, wholly or partly, dependent on




                                        6

<PAGE>   7





or held or accessible by any means (including, but not limited to, an
electronic, mechanical or photographic process, computerized or not) which are
not under the exclusive ownership and direct control of the Seller.

         The books of account, minute books and other material business records
of the Seller are complete and correct and have been maintained in accordance
with sound business practices.  The Seller has:

         (a) made and kept its books, records and accounts, which, in reasonable
detail, accurately and fairly reflect the transactions and dispositions of its
assets, and

         (b) devised and maintained a system of internal accounting control
sufficient to provide reasonable assurances that:

                  (i) transactions are executed in accordance with management's
         general or specific authorization;

                  (ii) transactions are recorded as necessary (A) to permit
         preparation of financial statements in conformity with GAAP or any
         other criteria applicable to such statements, and (B) to maintain
         accountability for assets;

                  (iii) access to assets is permitted only in accordance with
         management's general or specific authorization;

                  (iv) the recorded accountability for assets as compared with
         the existing assets at reasonable intervals and appropriate action is
         taken with respect to any differences; and

                  (v) the accounts/trade payables set forth on Exhibit 2.5(b)(v)
         were incurred in the ordinary course of business and no disputes exist
         thereto.

         Section 2.6 Absence of Certain Changes or Events. Since December 31,
1998, there has not been any adverse change in the assets, liabilities,
business, financial condition, operations, results of operations, or future
prospects of the Seller's




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<PAGE>   8





business.  Without limiting the generality of the foregoing, since that date:

         (a) the Seller has not sold, leased, transferred, or assigned any of
its assets, tangible or intangible, used in the business other than for a fair
consideration in the ordinary course of business;

         (b) with respect to Seller's business, the Seller has not entered into
any contract, lease, sublease, license, or sublicense (or series of related
contracts, leases, subleases, licenses, and sublicenses) either involving more
than $5,000 or outside the ordinary course of business;

         (c) with respect to Seller's business, no party (including the Seller)
has accelerated, terminated, modified, or canceled any contract, lease,
sublease, license, or sublicense (or series of related contracts, leases,
subleases, licenses, and sublicenses) involving more than $5,000 to which the
Seller is a party or by which it is bound;

         (d) the Seller has not imposed any security interest upon any of its
assets, tangible or intangible;

         (e) with respect to Seller's business, the Seller has not made any
capital expenditure (or series of related capital expenditures) either involving
more than $5,000 or outside the ordinary course of business;

         (f) with respect to Seller's business, the Seller has not made any
capital investment in, any loan to, or any acquisition of the securities or
assets of any other person (or series of related capital investments, loans, and
acquisitions) either involving more than $5,000 or outside the ordinary course
of business;

         (g) with respect to Seller's business, the Seller has not created,
incurred, assumed, or guaranteed any indebtedness (including capitalized lease
obligations) either involving more than $5,000 or outside the ordinary course of
business;





                                        8

<PAGE>   9





         (h) with respect to Seller's business, the Seller has not delayed or
postponed (beyond its normal practice) the payment of accounts payable and other
Liabilities, except as noted in Exhibit 1.5 (item 3);

         (i) with respect to Seller's business, the Seller has not canceled,
compromised, waived, or released any right or claim (or series or related rights
and claims) either involving more than $5,000 or outside the ordinary course of
business;

         (j) with respect to Seller's business, the Seller has not granted any
license or sublicense of any rights under or with respect to any Intellectual
Property;

         (k) there has been no change made or authorized in the charter or
bylaws of the Seller other than those contemplated herein;

         (l) with respect to Seller's business, the Seller has not experienced
any damage, destruction, or loss (whether or not covered by insurance) to its
property;

         (m) with respect to Seller's business, the Seller has not made any loan
to, or entered into any other transaction with, any of its directors, officers,
and employees outside the ordinary course of business giving rise to any claim
or right on its part against the person or on the part of the person against it;

         (n) with respect to Seller's business, the Seller has not entered into
any employment contract or collective bargaining agreement, written or oral, or
modified the terms of any existing such contract or agreement;

         (o) with respect to Seller's business, the Seller has not granted any
increase outside the ordinary course of business in the base compensation of any
of its directors, officers, and employees;

         (p) with respect to Seller's business, the Seller has not adopted any
(i) bonus, (ii) profit-sharing, (iii) incentive compensation, (iv) pension, (v)
retirement, (vi) medical, hospitalization, life, or other insurance, (vii)
severance, or




                                        9

<PAGE>   10





(viii) other plan, contract, or commitment for any of its directors, officers,
and employees, or modified or terminated any existing such plan, contract, or
commitment;

         (q) with respect to Seller's business, the Seller has not made or
pledged to make any charitable or other capital contribution outside the
ordinary course of business;

         (r) with respect to Seller's business, the Seller has not delayed
payment of any amount to any third party with respect to any Liability or
obligation (including any costs and expenses the Seller has incurred or may
incur in connection with this Agreement or any of the transitions contemplated
hereby); and

         (s) with respect to Seller's business, there has not been any other
occurrence, event, incident, action, failure to act, or transaction outside the
ordinary course of business involving the Seller.

         (t) With respect to Seller's business, there has not been any inquiry,
notice or other communication from the Federal Aviation Administration ("FAA")
relating to any event, incident, action, failure to act or other transaction
involving the Seller.

         Section 2.7 Undisclosed Liabilities. With respect to the Seller's
business, the Seller has no Liability (and there is no basis for any present or
future charge, complaint, action, suit, proceeding, hearing, investigation,
claim or demand against any of them giving rise to any Liability), except for
(i) Liabilities set forth on the face of the December 31, 1998 Balance Sheet and
(ii) Liabilities which have arisen after December 31, 1998 in the ordinary
course of business (none of which relates to any breach of contract, breach of
warranty, tort, infringement, or violation of law or arose out any charge,
complaint, action, suit, proceeding, hearing, investigation, claim, or demand).

         Section 2.8  Tax Matters.

         (a) The Seller has filed or will file all tax returns that it was
required to file. All taxes owed by the Seller (whether or not shown on any tax
return) have been paid or will be paid. The Seller currently is not the
beneficiary of any extension of




                                       10

<PAGE>   11





time within which to file any tax return. No claim has ever been made by an
authority in a jurisdiction where the Seller does not file tax returns that it
is or may be subject to taxation by that jurisdiction. There are no security
interests on any of the assets of any of the Seller that arose in connection
with any failure (or alleged failure) to pay any tax. All tax returns disclosed
herein have been accurately prepared and reflect all known tax liabilities of
the Seller.

         (b) Except as is disclosed in Section 2.8(b) and Exhibit 1.5 (item iii)
of the Disclosure Schedule, the Seller has withheld and paid all taxes required
to have been withheld and paid in connection with amounts paid or owing to any
employee, creditor, independent contractor, or other third party.

         (c) No officer (or employee responsible for tax matters) of the Seller
expects any authority to assess any additional taxes for any period for which
tax returns have been filed. There is no dispute or claim concerning any tax
liability of the Seller either (i) claimed or raised by any authority in writing
or (ii) as to which any of officers (and employees responsible for tax matters)
of the Seller has knowledge based upon personal contact with any agent of such
authority.

         (d) All ad valorem property taxes for 1998 and all years prior to 1998
imposed on the Seller with respect to, or which may become a lien on, the
Subject Assets have been paid in full.

         Section 2.9 Furniture, Equipment, Etc. The Seller has good and
marketable title to the Tangible Property, free and clear of all liens, charges,
security interests, easements, reservations, restrictions, encumbrances and
other defects in title (collectively, "Encumbrances"), has the right to convey
such Tangible Property to the Purchaser, at the Closing shall have conveyed to
the Purchaser good and marketable title to such Tangible Property free and clear
of all Encumbrances, and will warrant and defend the title to such Tangible
Property in the Purchaser against the lawful claims of all persons whomsoever.

         Except as set forth in Section 2.9 of the Disclosure Schedule, none of
the Tangible Property is leased by the Seller from any other party. There is no
default under the leases




                                       11

<PAGE>   12





described on Section 2.9 of the Disclosure Schedule and such leases are valid
and enforceable in accordance with their terms.

         All Tangible Property is in good operating condition and repair,
ordinary wear and tear excepted.

         Section 2.10 Inventory. The Seller has good and marketable title to the
Inventory described on the December 31, 1998 Balance Sheet and listed on Exhibit
1.1(a)(i), free and clear of all Encumbrances, has the right to convey such
Inventory to the Purchaser, at the Closing shall have conveyed to the Purchaser
good and marketable title to such Inventory free and clear of all Encumbrances
and will warrant and defend the title to such Inventory in Purchaser against the
lawful claims of all persons whomsoever.

         The level of Inventory at Closing will not vary materially from that
shown on December 31, 1998 Balance Sheet and will not exceed normal inventory
levels necessary to conduct the Seller's business in the ordinary course of the
Seller's business.

         Section 2.11 Intellectual Property. The Seller has exclusive rights to
use the Intellectual Property described on Exhibit 1.1(a)(v) in connection with
its business as and where now conducted and the use of the Intellectual Property
by the Seller in its business as and where now conducted does not violate or
infringe the rights of any other person, nor is the Seller a party to any
agreement with any other person or entity with respect to the use of the
Intellectual Property.

         Section 2.12 Contracts. With respect to Seller's business, Exhibit
1.1(a)(iv) lists all contracts, including the following contracts, agreements,
and other written arrangements to which the Seller is a party:

         (a) any written arrangement for the lease of personal property from or
to third parties providing for lease payments;

         (b) any written on-going arrangement for the purchase or sale of raw
materials, commodities, supplies, products, or other personal property or for
the furnishing or receipt of services




                                       12

<PAGE>   13


(including any agent or representation agreements with third parties);

         (c) any written arrangement concerning a partnership or joint venture;

         (d) any written arrangement under which it has created, incurred,
assumed, or guaranteed (or may create, incur, assume, or guarantee) indebtedness
(including capitalized lease obligations) or under which it has imposed (or may
impose) a security interest on any of its assets, tangible or intangible;

         (e) any written arrangement concerning confidentiality or competition;

         (f) any written arrangement involving any of the Seller's stockholders
and its affiliates;

         (g) any written arrangement with any of its directors, officers, and
employees in the nature of a collective bargaining agreement, employment
agreement, or severance agreement;

         (h) any written arrangement under which the consequences of a default
or termination could have an adverse effect on the assets, liabilities,
business, financial condition, operations, results of operations, or future
prospects of Seller's business; or

         (i) any other written arrangement either involving more than $5,000 or
not entered into in the ordinary course of business.

         The Seller has delivered to the Purchaser and AASI a correct and
complete copy of each written arrangement listed in Exhibit 1.1(a)(iv). With
respect to each Contract: (i) the written arrangement is legal, valid, binding,
enforceable, and in full force and effect; (ii) the written arrangement will
continue to be legal, valid, binding, and enforceable and in full force and
effect on identical terms following the Closing; (iii) no party is in breach or
default, and no event has occurred which with notice or lapse of time would
constitute a breach or default or permit termination, modification, or
acceleration, under the




                                       13

<PAGE>   14





written arrangement; and (iv) no party has repudiated any provision of the
written arrangement. The Seller is not a party to any verbal contract,
agreement, or other arrangement, which, if reduced to written form, would be
required to be listed in Exhibit 1.1(a)(iv) under terms of this Section 2.12.
The contracts and arrangements on Exhibit 1.1(a)(iv) constitute all of the
agreements, contracts, arrangements and rights necessary to conduct the Seller's
business as it is presently conducted and presently proposed to be conducted.

         To Seller's knowledge, no filled customer order or commitment of the
Seller's business obligating the Seller to process, manufacture, or deliver
products or perform services will result in a loss to the Seller upon completion
of performance. No purchase order or commitment of the Seller with respect to
Seller's business is in excess of normal requirements, nor are prices provided
therein in excess of current market prices for the products or services to be
provided thereunder. To Seller's knowledge, no supplier of the Seller has
indicated within the past year that, with respect to Seller's business, it will
stop, or decrease the rate of, supplying materials, products, or services to
them and no customer of the Seller has indicated within the past year that it
will stop, or decrease the rate of, buying materials, products, or services from
it.

         Section 2.13  Software and Information Systems.

         (a) Section 2.13 of the Disclosure Schedule sets forth an accurate and
complete list and summary description of all the software used in and related to
Seller's business ("Software"). The Software identified on Section 2.13 of the
Disclosure Schedule is all the software necessary for the operation of Seller's
business as it is presently conducted and as presently proposed to be conducted.
Section 2.13 of the Disclosure Schedule identifies or describes (i) Software
which is owned by the Seller and (ii) Software which is licensed to the Seller
by third parties. Each person who participated in the development of Software
owned by Seller has either so participated as an employee of Seller or entered
into a written agreement assigning the copyright in such Software (including the
related documentation) to Seller. In each instance in which Seller is using or
has used Software, or a copy thereof, that it purchased




                                       14

<PAGE>   15





or licensed from a third party (other than word processing, accounting,
communications and similar business software that is commercially available to
any third party at a cumulative cost not in excess of $5,000): (i) Seller has
the perpetual, irrevocable, transferable, worldwide right to use, copy, modify,
prepare, derivatives of, sublicense, distribute and modify, prepare derivatives
of, sublicense, distribute and otherwise market each Software; and (ii) Seller
has possession of and the right to use the most current, fully documented source
code version of such Software.

         (b) Seller does not sell, license, sublicense or otherwise market
Software to third parties and has not entered into any Contract that grants any
third party a license or sublicense in Software. Seller has not entered into any
Contract, other than those Contracts listed on Section 2.13(b) of the Disclosure
Schedule, that restricts Seller's use of Software or that obligates Seller to
maintain, enhance, protect or otherwise take any action with respect to
Software.

         (c) Except as is set forth in Section 2.13(c) of the Disclosure
Schedule, all Software that Seller uses includes four digit format for the
indication of the relevant year and, at no additional costs to Purchaser, and
without human intervention, will correctly recognize and correctly process data
and formulas relating to the year 2000 and beyond and provide all such
date-related data and formulas used by other applications in a format that will
permit the correct recognition and processing of data by the other applications.
Seller, except as disclosed in this Section 2.13 is not aware of any year 2000
(Y2K) issues with any major customers and suppliers.

         (d) To Seller's knowledge, except as set forth in Section 2.13(d) of
the Disclosure Schedule, there are no defects or errors in the Software, which
defects or errors could materially and adversely affect Purchaser's or any
licensee's use of the Software or the functioning of the Software in accordance
with the specifications for the Software.

         Section 2.14  Real Property Leases.  With respect to Seller's business,
Section 2.14 of the Disclosure Schedule lists and describes briefly all real
property leased or subleased to




                                       15

<PAGE>   16





the Seller. The Seller has delivered to the Purchaser correct and complete
copies of the leases and subleases listed in Section 2.14 of the Disclosure
Schedule. With respect to each lease and sublease listed in Section 2.14 of the
Disclosure Schedule:

         (a) the lease or sublease is legal, valid, binding, enforceable, and in
full force and effect;

         (b) the lease or sublease will continue to be legal, valid, binding,
enforceable, and in full force and effect on identical terms following the
Closing.

         (c) no party to the lease or sublease is in breach or default, and no
event has occurred which, with notice or lapse of time, would constitute a
breach or default or permit termination, modification, or acceleration
thereunder;

         (d) no party to the lease or sublease has repudiated any provision
thereof;

         (e) there are no disputes, oral agreements, or forbearance programs in
effect as to the lease or sublease;

         (f) with respect to each sublease, the representations and warranties
set forth in subsections (a) through (e) above are true and correct with respect
to the underlying lease;

         (g) the Seller has not assigned, transferred, conveyed, mortgaged,
deeded in trust, or encumbered any interest in the leasehold or subleasehold;

         (h) all facilities leased or subleased thereunder have received all
approvals of governmental authorities (including licenses and permits) required
in connection with the operation thereof and have been operated and maintained
in accordance with applicable laws, rules, and regulations; and

         (i) all facilities leased or subleased thereunder have received all
approvals of governmental authorities (including licenses and permits) required
in connection with the operation thereof and have been operated and maintained
in accordance with applicable laws, rules, and regulations.




                                       16

<PAGE>   17





         Section 2.15 Accounts Receivable. All accounts receivable of the Seller
with respect to Seller's business are reflected properly on its books and
records, are valid receivables subject to no setoffs or counterclaims, are
presently current and collectible, and will be collected in accordance with
their terms at their recorded amounts, subject only to the reserve for bad debts
set forth on the face of the December 31, 1998 Balance Sheet as adjusted for the
passage of time in accordance with the past custom and practice of the Seller.

         Section 2.16 Licenses. The rights of the Seller under the Licenses
described or referred to in Exhibit 1.1(a)(viii) are valid and enforceable by
the Seller in accordance with their respective terms. Neither the Seller nor the
other parties thereto are in default in any material respects (nor does any
circumstance exist which, with notice or the passage of time or both, would
result in such a default) under the Licenses. The parties further acknowledge
that subsequent to the closing of the instant agreement, Purchaser will be
required, pursuant to 14 C.F.R. Section 145.15 to apply for an amended
certificate pursuant to 14 C.F.R. Section 145.11. Prior to the grant of the
amended certificate, Seller and Purchaser shall act under the Seller's old
certificate as may be legally permissible to continue without interruption the
operation of the Seller.





                                       17

<PAGE>   18





         Section 2.17 Litigation. Section 2.17 of the Disclosure Schedule sets
forth each instance in which the Seller or the Shareholders (i) are subject to
any unsatisfied judgment, order, decree, stipulation, injunction, or charge or
(ii) are a party to the knowledge of any officers (and employees with
responsibility for litigation matters) of the Seller or is threatened to be made
a party to any charge, complaint, action, suit, proceeding, hearing, or
investigation of or in any court or quasi-judicial or administrative agency of
any federal, state, local, or foreign jurisdiction or before any arbitrator.
None of the charges, complaints, actions, suits, proceedings, hearings, and
investigations set forth in Section 2.17 of the Disclosure Schedule could result
in any adverse change in the assets, liabilities, business, financial condition,
operations, results of operations, or future prospects of Seller's business.
None of the officers or shareholders (and employees with responsibility for
litigation matters) of the Seller have any reason to believe that any such
charge, complaint, action, suit, proceeding, hearing, or investigation may be
brought or threatened against the Seller.

         Section 2.18  Employees.

         (a) Employee Census. Seller has furnished an accurate employee census,
detailing the Employee's date of hire, salary, benefits and other pertinent
information in Section 2.18 of the Disclosure Schedule. There shall have been no
material increase in any compensation paid or payable to the employees of Seller
unless otherwise disclosed and agreed to by Purchaser.

         (b) No Contracts or Future Contracts. Seller has no employment
contracts that cannot be terminated without liability and further, Seller will
not contact any employees to work for Seller after closing without first
obtaining Purchaser's written permission.

         (c) Restrictions on Employees. No officer or employee of the Seller is
subject to any agreement with any other person or entity which requires such
officer or employee to assign any interest in inventions or other intellectual
property or keep confidential any trade secrets, proprietary data, customer
lists or other business information or which restricts such officer or




                                       18

<PAGE>   19





employee from engaging in competitive activities or solicitation of customers.

         (d) Retention of Employees. Seller has no employment contracts, written
or oral, with any employee of Seller that is not terminable at Seller's
discretion and with no commitment or obligation of severance pay or benefits
except as described in Section 2.18 of the Disclosure Schedule. Seller shall be
responsible for any severance or wrongful termination claims each of these
employees may have and agree to indemnify Purchaser from the same occurring
prior to the Closing. Seller shall terminate all employees effective as of the
date of Closing. Purchaser will hire the employees on the same terms and
conditions as currently exist, including that there will be no lapse in benefits
and credit will be given for years of actual service.

         (e) Employee Benefits. Section 2.18 of the Disclosure Schedule lists
all employee benefit plans that the Seller maintains or to which the Seller
contributes for the benefit of any current or former employee of the Seller
("Employee Benefit Plan").

         (f) ERISA Matters.

                  (i) Except as set forth on Section 2.18 of the Disclosure
         Schedule, the Seller (or any person or entity under "common control"
         with it ("ERISA Affiliates"), as "common control" is defined under the
         Employee Retirement Income Security Act of 1974, as amended ("ERISA")
         does not maintain or contribute to, or has not maintained or
         contributed to, any bonus, pension, profit sharing, deferred
         compensation, retirement, hospitalization, medical or dental
         reimbursement, severance pay, vacation pay, disability, death benefit,
         insurance, and other similar plans, programs, or arrangements providing
         benefits to the employees of the Seller (including but not limited to
         "employee pension benefit plans" and "employee welfare benefit plans"
         within the meaning of Section 3(1) and 3(2) of ERISA ("Pension Benefit
         Plans") and Welfare Benefit Plans" respectively)). The Seller has
         delivered to Purchaser true copies of all plans set forth in Section
         2.18 of the Disclosure Schedule.





                                       19

<PAGE>   20





                  (ii) Neither the Seller nor its ERISA Affiliates have or have
         ever had an obligation to contribute to a "multiemployer plan" within
         the meaning of Section 4001(a)(3) of ERISA.

                  (iii) Each Welfare Benefit Plan has been funded and will
         continue to be funded in accordance with its terms through the Closing
         Date, including the payment of applicable premiums, for coverage
         through Closing Date, on any insurance contract funding a Welfare
         Benefit Plan.

                  (iv) Each Welfare Benefit Plan which is a "group health plan,"
         as defined in Section 607(1) of ERISA has been operated in material
         compliance with the provisions of Part 6 of Title I of ERISA and
         Section 4980B of the Code at all times. Section 2.18 of the Disclosure
         Schedule has a complete and accurate list of all present and former
         employees of the Seller and their respective beneficiaries who, as of
         the date hereof, are receiving or who are eligible to elect to receive
         benefits pursuant to such group health plans and the provisions of
         ERISA and the Code as well as the current hourly pay or yearly salary.

         Section 2.19  Environmental Matters.

         (a) Except as set forth in Section 2.19(a) of the Disclosure Schedule,
the Seller and the property owned or used in its business are, and at all times
have been, in compliance with all applicable Federal, state and local statutes,
laws, ordinances, regulations and codes related in any way to Hazardous
Materials (as hereinafter defined) and underground storage tanks. As used
herein, Hazardous Materials shall mean solid waste (as that term is defined in
the Resource Conservation and Recovery Act, 42 U.S.C.A. Section 6901, et seq,
and the regulations adopted pursuant thereto), hazardous substances (as that
term is defined in the Comprehensive Environmental Response Compensation and
Liability Act, 42 U.S.C.A. Section 9601, et seq, and the regulations adopted
pursuant thereto), and other pollutants, including, without limitation, any
solid, liquid, gaseous or thermal irritant or contaminant, such as smoke, vapor,
soot, fumes, acids, alkaloids or chemicals.





                                       20

<PAGE>   21





         (b) Except as set forth in Section 2.19(b) of the Disclosure Schedule,
during Seller's occupancy of the property used in its business, no Hazardous
Materials have been generated, treated, stored or disposed of at, or transported
to or form, the Seller or the property owned or used in the Seller's business at
any time.

         (c) Except as set forth in Section 2.19(c) of the Disclosure Schedule,
to Seller's knowledge no asbestos or materials containing asbestos have been
installed, used, treated, stored or disposed of by the Seller in or on property
owned or used by the Seller at any time.

         (d) To Seller's knowledge, except as set forth in Section 2.19(d) of
the Disclosure Schedule, during Seller's occupancy of the property used in its
business, no polychlorinated biphenyls are located on or in the facilities of
the Seller or any property owned or used by the Seller at any time.

         (e) Except as set forth in Section 2.19(e) of the Disclosure Schedule,
the Seller holds all necessary permits or licenses to enable it to comply with
all statutes, laws, ordinances, regulations and codes related in any way to
Hazardous Materials or underground storage tanks.

         (f) Except as set forth in Section 2.19(f) of the Disclosure Schedule,
no notice has been served on the Seller or any of its directors, officers or
shareholders from any entity, governmental body or individual claiming violation
of any statute, law, ordinance, regulation or code related in any way to
Hazardous Materials or underground storage tanks, requiring compliance with any
statute, law, ordinance, regulation or code related in any way to Hazardous
Materials or underground storage tanks, or demanding payment of or contributions
for damage regarding the Seller or property owned or used by the Seller related
in any way to Hazardous Materials or underground storage tanks, including
without limitation, damages to the environment or natural resources.







                                       21

<PAGE>   22



         Section 2.20  Legal Compliance.

         (a) With respect to Seller's business, the Seller has complied with all
laws (including rules and regulations thereunder) of federal, state, local, and
foreign governments (and all agencies thereof), and no charge, complaint,
action, suit, proceeding, hearing, investigation, claim, demand, or notice has
been filed or commenced against the Seller alleging any failure to comply with
any such law or regulation, except as disclosed on Exhibit 1.5 (item iii).

         (b) With respect to Seller's business, the Seller has complied with all
applicable laws (including rules and regulations thereunder) relating to the
employment of labor, employee civil rights, and equal employment opportunities.

         (c) With respect to Seller's business, the Seller has not violated in
any respect or received a notice or charge asserting any violation of the
Sherman Act, the Clayton Act, The Robinson-Patman Act, or the Federal Trade
Commission Act, each as amended.

         (d) With respect to Seller's business, the Seller has not:

                  (i) made or agreed to make any contribution, payment, or gift
         of funds or property to any governmental official, employee, or agent
         where either the contribution, payment, or gift or the purpose thereof
         was illegal under the laws of any federal, state, local, or foreign
         jurisdiction;

                  (ii) established or maintained any unrecorded operating asset
         for any purpose; or

                  (iii) made or agreed to make any contribution, or reimbursed
         any political gift or contribution made by any other person, to any
         candidate for federal, state, local, or foreign public office.

         (e) With respect to Seller's business, the Seller has filed in a timely
manner all reports, documents, and other materials it was required to file (and
the information contained therein was correct and complete in all respects)
under all applicable laws (including rules and regulations thereunder).





                                       22

<PAGE>   23





         (f) With respect to Seller's business, the Seller has possession of all
records and documents it was required to retain under all applicable laws
(including rules and regulations thereunder).

         Section 2.21 Product Warranty. With respect to Seller's business, each
service provided, overhauled parts and other parts and products manufactured,
sold, leased, or delivered by the Seller has been in conformity with all
applicable contractual commitments and all express and implied warranties, and,
with respect to Seller's business, the Seller has no liability (and to Seller's
knowledge there is no present or future charge, complaint, action, suit,
proceeding, hearing, investigation, claim, or demand against any service,
overhauled parts or other parts and products giving rise to any liability) for
replacement or repair thereof or other damages in connection therewith, except
as is disclosed in Section 2.21 of the Disclosure Schedule. With respect to
Seller's business, no service, overhauled parts or other parts and products
manufactured, sold, leased, or delivered by the Seller is subject to any
guaranty, warranty, or other indemnity beyond the applicable standard terms and
conditions of sale or lease. With respect to Seller's business, Section 2.21 of
the Disclosure Schedule includes copies of the standard invoices (containing
terms and conditions of services provided, terms and conditions of sale or
lease, applicable guaranty, warranty, and indemnity provisions).

         Section 2.22 Product Liability; Product Safety. Except as set forth on
Section 2.22 of the Disclosure Schedule, the Seller has no liability (and to
Seller's knowledge there is no present of future charge, complaint, action,
suit, proceeding, hearing, investigation, claim, or demand against Seller giving
rise to any liability) arising out of any injury to persons or property as a
result of a service performed by Seller or as a result of the ownership,
possession, or use of any overhauled part or other parts and products
manufactured, sold, leased, or delivered by the Seller.

         Except as set forth on Section 2.22 of the Disclosure Schedule, the
Seller has not been required to file any notification or other report with or to
provide information to any product safety agency, commission, board or other




                                       23

<PAGE>   24





governmental authority of any jurisdiction concerning actual or potential
hazards with respect to any service Seller has provided or with respect to any
flight controls, overhauled parts or other parts and products manufactured or
sold by Seller. Each service performed by Seller, overhauled part and other
parts and products manufactured, distributed or sold by Seller complies in all
material respects of all product safety standards or each applicable product
safety agency, commission, board or other governmental authority. The Seller has
not made any misrepresentation or furnished any information containing any
material omission to any products safety testing laboratory or a similar
organization. The Seller has not failed to obtain approval of any product,
component or process which is used, manufactured or licensed by the Seller in
the conduct of its business which is legally required to be approved by any
independent or government-sponsored testing laboratory, industry, trade
association or similar body agency or association.

         Section 2.23 Insurance. Seller maintains in full force and effect
insurance coverage on its assets, properties, premises, operations and personnel
in such amounts and against such risks and losses as are adequate and customary
for the business engaged in by Seller. Section 2.23 of the Disclosure Schedule
lists all policies of insurance owned by the Seller and now in effect insuring
all its business, assets and personnel, and sets forth for such policy the name
of the insurer, the type of coverage, the amount of coverage, the term thereof
and the annual premium.

         Section 2.24 Disclosure. None of the representations or warranties of
Seller contained herein, none of the information contained in the Disclosure
Schedule referred to in this Article II and none of the other information or
documents furnished to the Purchaser pursuant to the terms of this Agreement is
or will be false or misleading in any material respect, or omits or will omit to
state a fact herein or therein necessary to make the statements herein or
therein not misleading in any material respect. To Seller's knowledge, there is
no fact which adversely affects or in the future is likely to affect adversely
the Subject Assets or the Seller's business in any material respect which has
not been set forth or referred to in this Agreement, Exhibits or the Schedules
hereto.




                                       24

<PAGE>   25


                                   ARTICLE III

            REPRESENTATIONS AND WARRANTIES OF THE PURCHASER AND AASI

         To induce the Seller to enter into this Agreement and to sell the
Subject Assets, the Purchaser and AASI hereby represent and warrant that the
statements contained in this Article III are correct and complete as of the
Closing Date, except as set forth in the Disclosure Schedule.

         Section 3.1 Corporate Organization and Authority. The Purchaser and
AASI are corporations duly organized and validly existing and in good standing
under the laws of the jurisdiction of their incorporation, with full corporate
power and authority to conduct its business as now conducted and to enter into
and perform its obligations under this Agreement. The Purchaser's and AASI's
execution, delivery and performance of this Agreement and its acquisition of and
payment for the Subject Assets have been duly authorized by all requisite
corporate action on the part of the Purchaser and AASI, and this Agreement
constitutes, and all agreements and other instruments and documents to be
executed and delivered by the Purchaser and AASI hereunder will constitute, the
Purchaser's and AASI's legal, valid and binding obligations, enforceable against
the Purchaser and AASI in accordance with their terms.

         Section 3.2 Absence of Conflicts and Consent Requirements. The
Purchaser's and AASI's execution and delivery of this Agreement and performance
of its obligations hereunder, including the purchase of and payment for the
Subject Assets hereunder, do not and will not conflict with, violate or result
in any default under the Purchaser's or AASI's Articles of Incorporation or
Bylaws or any mortgage, indenture, agreement, instrument or other contract to
which the Purchaser or AASI is a party or by any judgment, order, decree, law,
statute, regulation or other judicial or governmental restriction to which the
Purchaser and AASI are subject. The Purchaser's and AASI's execution and
delivery of this Agreement and performance of its obligations hereunder,
including the purchase of and payment for the Subject Assets, do not and will
not require the consent of, or any prior




                                       25

<PAGE>   26





filing with or notice to, any governmental authority or other third party.

         Section 3.3 No Material Misstatements or Omissions. The representations
and warranties of the Purchaser and AASI in this Agreement do not contain any
untrue statement of a material fact or omit to state any material fact necessary
to make the statements made therein not misleading.




                                   ARTICLE IV

                        CERTAIN COVENANTS AND AGREEMENTS

         Section 4.1 Change of the Seller's Name. Promptly after the Closing,
the Seller will take all action necessary to discontinue use of the Name and to
enable the Purchaser exclusively to use the Name, and at the Closing shall
deliver to the Purchaser all documents necessary to accomplish the foregoing.
Shareholders shall not operate under any corporate entity in any type of
aviation or aviation parts business.

         Section 4.2 Maintenance of Records. Inasmuch as certain of the Seller's
books, records and documents are to be included as Subject Assets and sold to
the Purchaser hereunder, and certain other of the Seller's books, records and
documents are Excluded Assets to be retained by the Seller hereunder, and the
Purchaser or the Seller may have need to have access to the books, records and
documents held by the other after the Closing, the Purchaser and the Seller
agree that they shall each maintain for at least three years after the Closing
Date (or for such longer period as may be required by applicable law) the
respective books, records and documents sold or retained hereunder. During such
period, representatives of the Purchaser shall be permitted to inspect and make
copies of such books, records, accounting work papers and other documents
retained by the Seller during normal business hours and upon reasonable notice
for purposes related to the continuation by the Purchaser of the Seller's
business; and representatives of the Seller shall be permitted to inspect and
make copies of the books, records and documents sold to the Purchaser during
normal




                                       26

<PAGE>   27



business hours and upon reasonable notice for purposes related to winding up its
affairs.

         Section 4.3 Further Assurances. The Seller, the Shareholders and the
Purchaser each hereby covenants and agrees with the other that at any time and
from time to time each will promptly execute and deliver to the other such
further assurances, instruments and documents and take such further action as
the other may reasonably request in order to carry out the full intent and
purpose of this Agreement.

         Section 4.4 Fees and Expenses. The Seller, the Shareholders and the
Purchaser shall each bear their own expenses in connection with the negotiation
and preparation of this Agreement and their consummation of the transactions
contemplated hereby, including without limitation the fees and expenses of their
respective counsel, accountants and consultants.

         Section 4.5 No Brokers. The Seller and the Purchaser each represent and
warrant to the other that no broker or finder has been involved or engaged by it
in connection with the transactions contemplated hereby, and each hereby agrees
to indemnify and save harmless the other from and against any and all broker's
or finder's fees, commissions or similar charges incurred or alleged to have
been incurred by the indemnifying party in connection with the transactions
contemplated hereby and any and all loss, liability, cost or expense (including
reasonable attorneys' fees) arising out of any claim that the indemnifying party
incurred any such fees, commissions or charges.

         Section 4.6 Bulk Transfer Compliance. Inasmuch as the Seller has agreed
to duly pay, perform and discharge the Excluded Liabilities and Obligations, the
Purchaser and the Seller hereby mutually agree to waive compliance with the
provisions of the Arizona Bulk Sales laws and of the corresponding laws of any
other jurisdiction, to the extent applicable to the transactions contemplated
hereby. The Seller covenants and agrees to indemnify and save harmless the
Purchaser from and against any and all loss, liability, cost and expense
(including reasonable attorneys' fees) arising out of noncompliance with said
Bulk Transfers.




                                       27

<PAGE>   28


                                    ARTICLE V

                              CONDITIONS TO CLOSING

         Section 5.1 Conditions to the Purchaser's Obligations. The obligations
of the Purchaser and AASI to complete the Closing are contingent upon the
fulfillment of each of the following conditions on or before the Closing Date,
except to the extent that the Purchaser may, in its absolute discretion, waive
any one or more thereof in whole or in part:

         (a) Instruments of Transfer. The Seller shall have delivered to the
Purchaser such assignments, bills of sale, deeds, certificates of title and
other instruments of transfer, all in form reasonably satisfactory to the
Purchaser, as are necessary to fully and effectively convey to the Purchaser all
of the Subject Assets in accordance with the terms hereof and shall have
executed the Consignment Agreement.

         (b) Consents. The consents, if any, described in the Exhibits hereto,
and all other consents, if any, required for the Seller to perform its
obligations hereunder, shall have been obtained in form reasonably satisfactory
to the Purchaser.

         (c) No Material Adverse Change. On the date of Closing, there shall not
have occurred any event or condition materially and adversely affecting the
financial condition, results of operations or business prospects of the Seller
except for matters resulting from adverse changes in economic conditions
affecting businesses generally.

         (d) No Adverse Proceedings. No action, suit or proceeding before any
court or any governmental or regulatory authority shall have been commenced, no
investigation by any governmental or regulatory authority shall have been
commenced, and no action, suit or proceeding by any governmental or regulatory
authority shall have been threatened against any of the parties to this
Agreement, or any of the principals, officers or directors of any of them, or
any of the Subject Assets seeking to restrain, prevent or change the
transactions contemplated hereby or questioning the validity or legality of any
of such transactions or seeking damages in connection with any of such
transactions.





                                       28

<PAGE>   29





         (e) Other Assurances. The Seller shall have delivered to the Purchaser
such other and further certificates, assurances and documents as the Purchaser
or AASI may reasonably request in order to evidence the accuracy of the Seller's
representations and warranties, the performance of its covenants and agreements
to be performed at or prior to the Closing, and the fulfillment of the
conditions to the Purchaser's obligations.

         (f) Lease of Facilities. Purchaser and Seller shall enter into leases
for the facilities in which Seller's business is presently located (the
"Leases").

         (g) Director and Shareholder Approval. All necessary director and
shareholder approval shall be given by Seller. A legal opinion shall be given by
counsel to the Seller as to this provision.

         (h) Employee Payroll Matters. Purchaser and Seller shall have resolved,
to Purchaser's and Seller's mutual satisfaction, the employee-related payroll
matters. Fulfillment of this obligation shall include, but not be limited to,
the filing of all outstanding returns for Arizona withholding liability and
federal employer/employee liability, FUTA and Medicare liability and payment of
all outstanding principal amounts due thereunder.

         (i) Opinion of Seller's Counsel. The Purchaser shall have received from
counsel for the Seller an opinion dated as of the date of Closing in form and
substance satisfactory to the Purchaser and its counsel, to the effect that:

                  (i) Seller is a corporation duly organized, validly existing
         and in good standing under the laws of Arizona.

                  (ii) All corporate or other proceedings required by law, the
         Articles of Incorporation and the bylaws of the Seller in connection
         with the authorization, execution and delivery of this Agreement and
         the consummation of the transaction contemplated have been duly and
         validly taken.

                  (iii) The Seller has the legal power and authority to
         consummate this transaction.





                                       29

<PAGE>   30





                  (iii) Except as disclosed in this Agreement, the Disclosure
         Schedule or the Exhibits hereto, such counsel is not aware of any
         pending or threatened action, suit, proceeding or investigation before
         any court or any public, regulatory, or governmental agency, authority
         or body, involving Seller or any of its existing officers or directors
         and such counsel do not know of any legal matter or government
         proceedings regarding Seller.

         In rendering such an opinion, counsel for Seller may rely (i) as to
matters of fact, to the extent they deem proper, on certificates of responsible
officers of Seller; and (ii) to the extent they deem proper, upon written
statements or certificates of officers of departments of various jurisdictions
having custody of documents respecting the corporate existence or good standing
of Seller, provided that copies of any such statements or certificates shall be
delivered to counsel for the Purchaser.

         (j) Articles of Incorporation, Bylaws, and Minutes. The Seller shall
have delivered to the Purchaser the Articles of Incorporation, the Bylaws, and
the corporate minutes of the Seller, along with a certificate, dated as of the
Closing Date, certifying as to the accuracy and completeness of such corporate
documents.

         (k) Corporate Documents. The Seller shall deliver to the Purchaser at
the Closing the following:

                  (i) a good standing certificate issued by the Secretary of the
         State of Arizona with respect to the Seller;

                  (ii) certified copies of resolutions of the shareholders and
         board of directors of the Seller authorizing the execution, delivery
         and performance by the Seller of this Agreement, the conveyance of the
         Subject Assets and the transactions contemplated hereby; and

                  (iii) a certificate of the Seller certifying that each of the
         obligations of the Seller to be performed on or before the Closing
         pursuant to this Agreement shall have been duly performed as of the
         Closing.





                                       30

<PAGE>   31





         Section 5.2 Conditions to the Seller's Obligations. The obligations of
the Seller to complete the Closing are contingent upon the fulfillment of each
of the following conditions on or before the Closing Date, except to the extent
that the Seller may, in its absolute discretion, waive any one or more thereof
in whole or in part:

         (a) Payment of Purchase Price. The Purchaser shall have paid to the
Seller the Purchase Price or delivered promissory notes to the Seller.

         (b) Employment Agreement. Purchaser shall enter into employment
agreements with Micah Chapman and Frank Zambo substantially in the form of
Exhibit 5.2(b) hereto.

         (c) No Adverse Proceedings. No action, suit or proceeding before any
court or any governmental or regulatory authority shall have been commenced, no
investigation by any governmental or regulatory authority shall have been
commenced, and no action, suit or proceeding by any governmental or regulatory
authority shall have been threatened, against any of the parties to this
Agreement, or any of the principals, officers or directors of any of them, or
any of the Subject Assets, seeking to restrain, prevent or change the
transactions contemplated hereunder or questioning the validity or legality of
any of such transactions or seeking damages in connection with any of such
transactions.

         (d) Other Assurances. The Purchaser shall have delivered to the Seller
such other and further certificates, assurances and documents as the Seller may
reasonably request in order to evidence the accuracy of the Purchaser's
representations and warranties, the performance of its covenants and agreements
to be performed at or prior to the Closing, and the fulfillment of the
conditions to the Seller's obligations.

         (e) Opinion of the Purchaser's Counsel. The Purchaser shall have
furnished the Seller with an opinion, dated the date of Closing, of Gray,
Layton, Kersh, Solomon, Sigmon, Furr & Smith, P.A., counsel for the Purchaser
and AASI, in form and substance satisfactory to the Seller and its counsel, to
the effect that: (i) the Purchaser and AASI are corporations duly organized,
validly existing and in good standing under the laws of Arizona and




                                       31

<PAGE>   32





Delaware respectively and has all requisite power and authority to execute and
deliver this Agreement and to perform their obligations under this Agreement;
(ii) all corporate or other proceedings required by law, the Articles of
Incorporation and By-laws of Purchaser and AASI or by the provisions of this
Agreement to be taken by the Purchaser and AASI on or before the date of
Closing, in connection with the authorization, execution and delivery of this
Agreement and the consummation of the transaction contemplated by this
Agreement, have been duly and validly taken; and (iii) the Purchaser and AASI
have the legal power and authority to consummate this transaction.





                                   ARTICLE VI

                                 INDEMNIFICATION

         Section 6.1 Indemnification by the Seller and Shareholders. Subject to
the procedures and limitations set forth in this Article VI, the Seller and
Shareholders (except for Glen Hiscox), jointly and severally, hereby agree to
indemnify and save harmless the Purchaser from and against any and all
liabilities, losses, claims, judgments, damages, expenses and costs (including,
without limitation reasonable counsel fees and costs and expenses incurred in
connection therewith) (a "Loss") incurred by the Purchaser arising after the
Closing out of any of the following:

         (a) Breach of Warranty. The falsity or incorrectness of any
representation or warranty made by the Seller or Shareholders in this Agreement
or in any instrument or document delivered by the Seller or Shareholders to the
Purchaser pursuant to this Agreement;

         (b) Breach of Covenants. The Seller's failure to duly perform any
covenant or agreement to be performed by it under this Agreement or under any
instrument or document delivered by the Seller to the Purchaser pursuant to this
Agreement;

         (c) Claims Against Subject Assets. Any levy or other claim by any third
party against or with respect to the Subject Assets, or




                                       32

<PAGE>   33





any other claim by any third party against the Purchaser, arising out of any act
or omission or alleged act or omission of the Seller or Shareholders prior to
the Closing.

         The Purchaser shall have the right to be put in the same financial
position as it would have been in had each of the representations and warranties
of the Seller and Shareholders been true and correct or had the Seller or
Shareholders not breached any representations, warranties, covenants or
agreements, whether by payment by Seller or shareholders or by offset against
any future monies owed to the same.

         Section 6.2 Survival of the Seller's and Shareholders' Warranties. The
representations and warranties of the Seller and Shareholders made in this
Agreement or in any instrument or document delivered by the Seller or
Shareholders to the Purchaser pursuant to this Agreement shall survive the
Closing.

         Section 6.3 Indemnification by the Purchaser. After the Closing, the
Purchaser agrees that it will indemnify and save harmless the Seller from and
against any and all loss, liability, damages, cost or expense (including
reasonable attorneys' fees) incurred by the Seller (net of any benefits to the
Seller) arising out of the Purchaser's breach of any of its representations,
warranties, covenants and agreements in this Agreement or in any document
delivered by the Purchaser to the Seller hereunder.

         Section 6.4 Matters Involving Third Parties. If any third party shall
notify any Party (the "Indemnified Party") with respect to any matter which may
give rise to a claim for indemnification against any other Party (the
"Indemnifying Party") under this Article, then the Indemnified Party shall
notify each Indemnifying Party thereof promptly; provided, however, that no
delay on the part of the Indemnified Party in notifying any Indemnifying Party
shall relieve the Indemnifying Party from any liability or obligation hereunder
unless (and then solely to the extent) the Indemnifying Party thereby is
damaged. Within 15 days after the Indemnified Party has given notice of the
matter the Indemnifying Party may notify the Indemnified Party that the
Indemnifying Party is going to cure the matter and release the Indemnified Party
from any and all liability with respect thereto. In the event any Indemnifying
Party notifies the Indemnified Party within 15 days




                                       33

<PAGE>   34





after the Indemnified Party has given notice of the matter that the Indemnifying
Party is assuming the defense thereof, (A) the Indemnifying Party will defend
the Indemnified Party against the matter with counsel of its choice reasonably
satisfactory to the Indemnified Party, (B) the Indemnified Party may retain
separate co-counsel (at its cost), (C) the Indemnified Party will not consent to
the entry of any judgment or enter into any settlement with respect to the
matter without the written consent of the Indemnifying Party (not to be withheld
unreasonably), and (D) the Indemnifying Party will not consent to the entry of
any judgment with respect to the matter, or enter into any settlement which does
not include a provision whereby the plaintiff or claimant in the matter releases
the Indemnified Party from all Liability with respect thereto, without the
written consent of the Indemnified Party (not to be withheld unreasonably). In
the event no Indemnifying Party notifies the Indemnified Party with 15 days
after the Indemnified Party has given notice of the matter, the Indemnified
Party may defend against, or enter into any settlement with respect to, the
matter in any manner it reasonably may deem appropriate.

                                   ARTICLE VII

                                  MISCELLANEOUS

         Section 7.1 Merger Clause. This Agreement contains the final, complete
and exclusive statement of the agreement between the parties with respect to the
transactions contemplated herein and all prior or contemporaneous written or
oral agreements with respect to the subject matter hereof are merged herein.

         Section 7.2 Amendments. No change, amendment, qualification or
cancellation hereof shall be effective unless in writing and executed by each of
the parties hereto by their duly authorized officers.

         Section 7.3 Press Releases and Announcements. No party shall issue any
press release or announcement relating to the subject matter of this Agreement
prior to the Closing without the prior written approval of the other party;
provided, however, that any party may make any public disclosure it believes in
good faith is




                                       34

<PAGE>   35





required by law or regulation (in which case the disclosing party will advise
the other party prior to making the disclosure).

         Section 7.4 Benefits and Binding Effect. This Agreement shall be
binding upon and shall inure to the benefit of the parties hereto and their
respective heirs, personal representatives, successors, transferees and assigns.

         Section 7.5 Notices. All notices, requests and demands and other
communications hereunder must be in writing and shall be deemed to have been
duly given when (i) personally delivered, (ii) when forwarded by Federal
Express, Airborne or another private carrier which maintains records showing
delivery information, (iii) when sent via facsimile transmission but only if a
written or facsimile acknowledge of receipt is received by the sending party, or
(iv) when placed in the United States Mails and forwarded by Registered or
Certified Mail, return receipt requested, postage prepaid, addressed to the
party to whom such notice is being given at the following addresses:

<TABLE>
<S>                                     <C>
AS TO THE SELLER:                       Complete Controls, Inc.
                                        850 E. Teton Rd, Suite 8
                                        Tucson, AZ  85706

WITH COPY TO:                           Mark J. Valentine
                                        Monroe & Associates
                                        6280 E. Pima, Suite 106
                                        Tucson, AZ  85712

AS TO THE PURCHASER:                    American Aircarriers Support,
                                              Incorporated
                                        Attn: Joseph E. Civiletto
                                        P. O. Box 7566
                                              Charlotte, NC  28241

WITH COPY TO:                           David M. Furr
                                        Gray, Layton, Kersh, Solomon,
                                              Sigmon, Furr & Smith, P.A.
                                        P. O. Box 2636
                                        Gastonia, NC  28053-2636
</TABLE>






                                       35

<PAGE>   36


Any party may change the address(es) to which notices to it are to be sent by
giving notice of such change to the other parties in accordance with this
Section.

         Section 7.6 Captions. The captions are for convenience of reference
only and shall not be construed as a part of this Agreement.

         Section 7.7 Governing Law. This Agreement shall be construed,
interpreted, enforced and governed by and under the laws of the State of South
Carolina.

         Section 7.8 Submission to Jurisdiction. Each of the parties submits to
the jurisdiction of any state or federal court sitting in South Carolina in any
action or proceeding arising out of or relating to this Agreement, agrees that
all claims in respect of the action or proceeding may be heard and determined in
any such court, and agrees not to bring any action or proceeding arising out of
or relating to this Agreement in any other court. Each of the parties waives any
defense of inconvenient forum to the maintenance of any action or proceeding so
brought and waives any bond, surety, or other security that might be required of
any other party with respect thereto by suit on the judgment or in any other
manner provided by law.

         Section 7.9 No Third-Party Beneficiaries. This Agreement is not
intended to be for the benefit of and shall not be enforceable by any person who
or which is not a party hereto (or a permitted assign or successor to such
party).

         Section 7.10 Exhibits. All of the Exhibits hereto referred to in this
Agreement are hereby incorporated herein by reference and shall be deemed and
construed to be a part of this Agreement for all purposes.

         Section 7.11 Severability. The invalidity or unenforceability of any
one or more phrases, sentences, clauses or provisions of this Agreement shall
not affect the validity or enforceability of the remaining portions of this
Agreement or any part thereof.





                                       36

<PAGE>   37




         Section 7.12  Counterparts.  This Agreement may be executed in
any number of counterparts, all of which shall constitute one and
the same instrument.

         IN WITNESS WHEREOF, the Seller and the Purchaser have each caused this
Agreement to be executed by their respective duly authorized officers under
seal, all as of the day and year first above written.

<TABLE>
<S>                                               <C>
                                                     SELLER:

ATTEST:                                              COMPLETE CONTROLS, INC.

 /s/  Frank Zambo                                    /s/ Micah Chapman
- --------------------------------                    ------------------------------------  (SEAL)
      Secretary                                          President

                                                      /s/ Micah Chapman
                                                    ------------------------------------  (SEAL)
                                                     Micah Chapman

                                                      /s/ Glen Hiscox
                                                    ------------------------------------  (SEAL)
                                                     Glen Hiscox

                                                      /s/ Frank Zambo
                                                    ------------------------------------  (SEAL)
                                                     Frank Zambo


                                                     PURCHASER:

                                                     AMERICAN AIRCARRIERS SUPPORT
ATTEST:                                              ACQUISITION IV CORP.


 /s/ Elaine T. Rudisill                              By /s/ Joseph E. Civiletto
- --------------------------------                        ------------------------------------
     Asst. Secretary                                        President

                                                     AMERICAN AIRCARRIERS SUPPORT,
ATTEST:                                              INCORPORATED


 /s/ Elaine T. Rudisill                              By /s/ Joseph E. Civiletto
- --------------------------------                        ------------------------------------
     Asst. Secretary                                        President
</TABLE>





                                       37





<PAGE>   1
                                                                  EXHIBIT 10.1.8


                         EXECUTIVE EMPLOYMENT AGREEMENT


         EXECUTIVE EMPLOYMENT AGREEMENT effective April 1, 1999 (the
"Agreement") by and between AMERICAN AIRCARRIERS SUPPORT, INCORPORATED (the
"Company") with principal offices at Fort Mill, South Carolina and MICAH CHAPMAN
(the "Employee").

         NOW THEREFORE, in consideration of the foregoing premises and mutual
covenants herein contained, the parties hereto agree as follows:

         1.  Employment.  The Company agrees to employ the Employee and the
Employee agrees to serve the Company as the President of a newly formed
subsidiary that acquired the assets of Complete Controls, Inc. ("CCI").

         2. Position and Responsibilities. The Employee shall exert his best
efforts and devote full time and attention to the affairs of the Company.
Employee shall have no ownership in or operate any other active closely-held
corporation or business entity in the aviation or aviation parts or overhaul
business. The Employee shall have the authority and responsibility given by the
general direction, approval and control of the Board of Directors, Chief
Executive Officer, and President/Chief Operating Officer of the Company, to the
restrictions, limitations and guidelines set forth by the Board of Directors in
resolutions adopted in the minutes of the Board of Directors meetings, copies of
which will be provided to the Employee from time to time and will be
incorporated herein by reference.

         3. Term of Employment. The term of the Employee's employment under this
Agreement shall be deemed to have commenced on April 1, 1999 and shall continue
until April 1, 2002, (the "Initial Term"), subject to extension as hereinafter
provided or termination pursuant to the provisions set forth hereafter. Provided
that Employee is in compliance with all of his obligations hereunder, the term
of Employee's employment shall be automatically extended for two (2) additional
one-year terms upon expiration of the Initial Term unless either party hereto
receives 30 days' prior written notice from the other electing not to extend the
Employee's employment. Compensation during the term shall be that set forth in
Section 5 hereof, unless one of the termination provisions overrides.



<PAGE>   2



         4. Duties. During the period of his employment hereunder and except for
illness, specified vacation periods and reasonable leaves of absence, the
Employee shall devote his best efforts and full attention and skill to the
business and affairs of the Company and its affiliated companies, as such
business and affairs now exist and as they may be hereinafter changed or added
to, under and pursuant to the general direction of the Board of Directors of the
Company.

         5. Compensation. Commencing on April 1, 1999, the Company shall pay to
the Employee as compensation for his services the sum of $150,000.00 per year,
payable semi-monthly. Base compensation shall be reviewed annually by the
Compensation Committee of the Company. Employee shall also be eligible to
periodic stock option grants subject to the discretion of the Compensation
Committee of the Board of Directors. Concurrently with Employee's hire, Employee
shall be granted options to purchase 5,000 shares of Company's common stock at
the exercise price equal to the closing price of Company's common stock on the
date of the grant with vesting as set forth in the Plan.

         6. Employee's Incentive Pay. In addition to the compensation set forth
in Section 5 hereof, an EBITDA incentive compensation bonus shall be available
to Employee for each of the years of Employee's employment and shall be computed
from the following formula based on CCI's financial performance. The bonus
payments ("Payments") shall be calculated on a cumulative basis with respect to
each calendar year period as described below, beginning April 1, 1999, and shall
be paid, subject to the restrictions of such payment contained in this Agreement
and subject to applicable federal and local income tax and other payroll
withholding requirements, as follows: eighty percent (80%) of the amount payable
with respect to Employee shall be paid on or before January 31st of the
following year, and the balance shall be paid on the earlier of May 31st or the
date on which the audited financial statements for the Company which includes
the results for CCI for the applicable calendar year are issued by Company's
independent auditors. All amounts payable shall be paid directly to the
Employee, provided Employee is employed by the Company.

         The Payments with respect to each calendar year (the "Period Payment")
shall be a percentage (the "Allocable Percentage") of Employee's base salary as
set forth in Section 5 of this Agreement for such year determined in accordance
with the level


<PAGE>   3



(the "Applicable Earnings Level") of earnings (taking into account Payments made
hereunder) before interest, taxes, depreciation and amortization ("EBITDA") of
CCI for such Period. The Applicable Earnings Level shall be a percentage of the
management case level of EBITDA during any Period (the "Management Case
EBITDA"), as listed on Schedule 6 attached hereto, and the corresponding
Allocable Percentage for each Applicable Earnings Level shall be as listed on
Schedule 6. Actual EBITDA with respect to any Period shall be determined by the
Company based on the financial statements of CCI, included in the audited
financial statements of the Company.

         7. Expense Reimbursement. The Company will reimburse the Employee, at
least semi-monthly, for all reasonable and necessary expenses, including without
limitation, travel expenses, and reasonable entertainment expenses, incurred by
him in carrying out his duties under this Agreement. The Employee shall present
to the Company each month an account of such expenses in such form as is
reasonably required by the Board of Directors.

         8. Medical and Dental Coverage. Commencing with employment, the
Employee will be entitled to participate in the Company's employee group medical
and other group insurance programs on the same basis as other employees of the
Company.

         9. Medical Examination. The Employee agrees to submit himself for
physical examination on one occasion per year as requested by the Company for
the purpose of the Company's obtaining life insurance on the life of the
Employee for the benefit of the Company as may be required; provided, however,
that the Company shall bear the entire cost of such examinations and shall pay
all premiums on any key man life insurance obtained for the benefit of the
Company as beneficiary or with respect to any other designated beneficiary.

         10. Vacation Time. The Employee shall be entitled each year to a
reasonable vacation in accordance with the established practices of the Company,
now or hereafter in effect for the executive personnel, during which time the
Employee's compensation shall be paid in full.

         11. Benefits Payable on Disability. If the Employee becomes disabled
such that he is unable to properly perform services hereunder by reason of
illness or other physical or mental incapacity, the Company shall continue to
pay the Employee


<PAGE>   4



his then current salary hereunder for the first three (3) months of such
continuous disability commencing with the first date of such disability.

         12. Obligations of Employee During and After Employment.

                  (a) The Employee agrees that during the terms of his
         employment under this Agreement, he will engage in no other business
         activities directly or indirectly, which are competitive with or which
         might place him in a competing position to that of the Company, or any
         affiliated company.

                  (b) The Employee realizes that during the course of his
         employment, Employee will have produced and/or have access to
         confidential business plans, information, business opportunity records,
         notebooks, data, formula, specifications, trade secrets, customer
         lists, account lists and secret inventions and processes of the Company
         and its affiliated companies. Therefore, during or subsequent to his
         employment by the Company, or by an affiliated company, the Employee
         agrees to hold in confidence and not to directly or indirectly disclose
         or use or copy or make lists of any such information, except to the
         extent authorized by the Company in writing. All records, files,
         business plans, documents, equipment and the like, or copies thereof,
         relating to Company's business, or the business of an affiliated
         company, which Employee shall prepare, or use, or come into contact
         with, shall remain the sole property of the Company, or of an
         affiliated company, and shall not be removed from the Company's or the
         affiliated company's premises without its written consent, and shall be
         promptly returned to the Company upon termination of employment with
         the Company and its affiliated companies. The restrictions and
         obligations of Employee set forth in this Section 12(b) shall not apply
         to (i) information that is or becomes generally available and known to
         the industry (other than as a result of a disclosure directly or
         indirectly by Employee); or (ii) information that was known to Employee
         prior to Employee's employment by the Company or its predecessor.

                  (c) Because of his employment by the Company, Employee shall
         have access to trade secrets and confidential information about the
         Company, its business plans, its business accounts, its business
         opportunities, its expansion


<PAGE>   5



         plans into other geographical areas and its methods of doing business.
         Employee agrees that for a period of two (2) years after termination or
         expiration of his employment, he will not, directly or indirectly,
         compete with the Company in its then present business or anticipated
         lines in the aviation business. Further, for the same two (2) year
         period, Employee shall not hire or entice to hire any employees of
         Company to any other business Employee may pursue following termination
         or expiration of employment.

                  (d) In the event a court of competent jurisdiction finds any
         provision of this Section 12 to be so overbroad as to be unenforceable,
         then such provision shall be reduced in scope by the court, but only to
         the extent deemed necessary by the court to render the provision
         reasonable and enforceable, it being the Employee's intention to
         provide the Company with the broadest protection possible against
         harmful competition.

         13. Termination for Cause by the Company. The Company may, without
liability, terminate the Employee's employment hereunder for cause at any time
upon written notice from the Board of Directors specifying such cause, and
thereafter the Company's obligations hereunder shall cease and terminate;
provided, however, that such written notice shall not be delivered until after
the Board of Directors shall have given the Employee written notice specifying
the conduct alleged to have constituted such cause and the Employee has failed
to cure such conduct, if curable, within fifteen (15) days following receipt of
such notice.

         Grounds for termination "for cause" are one or more of the following:

                  (a)  A willful breach of a material duty by the
         Employee during the course of his employment;

                  (b)  Habitual neglect of a material duty by the
         Employee;

                  (c) Action or inaction by the Employee which places the
         Company in circumstances of financial peril;

                  (d) Fraud on the Company or conviction of a felony involving
         or against the Company; and


<PAGE>   6



                  (e) Ownership or operation of any other closely-held
         corporation or business entity actively engaged in the aviation or
         aviation parts business.

         14. Termination by the Employee or the Company Without Cause.

                  (a) The Employee, without cause, may terminate this Agreement
         upon 90 days prior written notice to the Company. In such event, the
         Employee shall be required to render the services required under this
         Agreement during such 90-day period unless otherwise directed by the
         Board of Directors. Compensation for vacation time not taken by
         Employee shall be paid to the Employee at the date of termination.
         Employee shall be paid for only the ninety (90) day period pursuant to
         normal pay practices and then all obligations hereunder regarding
         compensation in any form shall cease.

                  (b) The Company, without cause, may terminate this Agreement.
         In such event, the Company shall pay a severance allowance equal to the
         balance of the contract payable over the term of the contract at
         regular monthly installments unless the parties negotiate a mutually
         acceptable discounted lump sum. No other benefits will be provided once
         this Agreement is terminated and all other obligations hereunder
         regarding compensation in any form shall cease.

         15. Termination upon Death of Employee. In addition to any other
provision relating to the termination, this Agreement shall terminate upon the
Employee's death. In such event, the Company shall pay a severance allowance
equal to one hundred eighty (180) days' salary to the Employee's estate, which
may be covered by an insurance policy.

         16. Arbitration. Any controversy, dispute or claim arising out of, or
relating to, this Agreement and/or its interpretation shall, unless resolved by
agreement of the parties, be settled by binding arbitration in Charlotte, North
Carolina in accordance with the Rules of the American Arbitration Association
then existing. This Agreement to arbitrate shall be specifically enforceable
under the prevailing arbitration law of the State of South Carolina. The award
rendered by the arbitrators shall be final and judgment may be entered upon the
award in any court of the State of South Carolina having jurisdiction of the
matter.


<PAGE>   7

         17.  General Provisions.

                  (a) The Employee's rights and obligations under this Agreement
         shall not be transferrable by assignment or otherwise, nor shall
         Employee's rights be subject to encumbrance or to the claims of the
         Company's creditors. Nothing in this Agreement shall prevent the
         consolidation of the Company with, or its merger into, any other
         corporation, or the sale by the Company of all or substantially all of
         its property or assets.

                  (b) This Agreement and the rights of Employee with respect to
         the benefits of employment referred to herein constitute the entire
         Agreement between the parties hereto in respect of the employment of
         the Employee by the Company and supersede any and all other agreements
         either oral or in writing between the parties hereto with respect to
         the employment of the Employee. The parties however acknowledge a
         separate Confidentiality and Noncompetition Agreement which shall stand
         on its own separate and apart from this Agreement.

                  (c) The provisions of this Agreement shall be regarded as
         divisible, and if any of said provisions or any part thereof are
         declared invalid or unenforceable by a court of competent jurisdiction
         or in an arbitration proceeding, the validity and enforceability of the
         remainder of such provisions or parts thereof and the applicability
         thereof shall not be affected thereby.

                  (d) This Agreement may not be amended or modified except by a
         written instrument executed by Company and Employee.

                  (e) This Agreement and the rights and obligations hereunder
         shall be governed by and construed in accordance with the laws of the
         State of South Carolina.

         18. Construction. Throughout this Agreement the singular shall include
the plural, and the plural shall include the singular, and the masculine and
neuter shall include the feminine, wherever the context so requires.

         19. Text to Control. The headings of paragraphs and sections are
included solely for convenience of reference. If any conflict between any
heading and the text of this Agreement exists, the text shall control.


<PAGE>   8


         20.  Authority.  The officer executing this agreement on behalf of the
Company has been empowered and directed to do so by the Board of Directors of
the Company.

         21. Effective Date. This Agreement shall be effective on as of the date
cited above.


FOR THE COMPANY:                           AMERICAN AIRCARRIERS SUPPORT,
                                                   INCORPORATED


Dated   April 1. 1999                      By:    /s/ JOSEPH E. CIVILETTO
        --------------------                      -----------------------------
                                           Title:  President
                                                  -----------------------------


FOR THE EMPLOYEE:


Dated   April 1, 1999                             /s/ MICAH CHAPMAN       (SEAL)
        --------------------                      -----------------------------
                                                  MICAH CHAPMAN


<PAGE>   1

                                                                  EXHIBIT 10.1.9

                         EXECUTIVE EMPLOYMENT AGREEMENT


         EXECUTIVE EMPLOYMENT AGREEMENT effective April 1, 1999 (the
"Agreement") by and between AMERICAN AIRCARRIERS SUPPORT, INCORPORATED (the
"Company") with principal offices at Fort Mill, South Carolina and FRANK ZAMBO
(the "Employee").

         NOW THEREFORE, in consideration of the foregoing premises and mutual
covenants herein contained, the parties hereto agree as follows:

         1. Employment. The Company agrees to employ the Employee and the
Employee agrees to serve the Company as the Vice President of a newly formed
subsidiary that acquired the assets of Complete Controls, Inc. ("CCI").

         2. Position and Responsibilities. The Employee shall exert his best
efforts and devote full time and attention to the affairs of the Company.
Employee shall have no ownership in or operate any other active closely-held
corporation or business entity in the aviation or aviation parts or overhaul
business. The Employee shall have the authority and responsibility given by the
general direction, approval and control of the Board of Directors, Chief
Executive Officer, and President/Chief Operating Officer of the Company, to the
restrictions, limitations and guidelines set forth by the Board of Directors in
resolutions adopted in the minutes of the Board of Directors meetings, copies of
which will be provided to the Employee from time to time and will be
incorporated herein by reference.

         3. Term of Employment. The term of the Employee's employment under this
Agreement shall be deemed to have commenced on April 1, 1999 and shall continue
until April 1, 2002, (the "Initial Term"), subject to extension as hereinafter
provided or termination pursuant to the provisions set forth hereafter. Provided
that Employee is in compliance with all of his obligations hereunder, the term
of Employee's employment shall be automatically extended for two (2) additional
one-year terms upon expiration of the Initial Term unless either party hereto
receives 30 days' prior written notice from the other electing not to extend the
Employee's employment. Compensation during the term shall be that set forth in
Section 5 hereof, unless one of the termination provisions overrides.

<PAGE>   2


         4. Duties. During the period of his employment hereunder and except for
illness, specified vacation periods and reasonable leaves of absence, the
Employee shall devote his best efforts and full attention and skill to the
business and affairs of the Company and its affiliated companies, as such
business and affairs now exist and as they may be hereinafter changed or added
to, under and pursuant to the general direction of the Board of Directors of the
Company.

         5. Compensation. Commencing on April 1, 1999, the Company shall pay to
the Employee as compensation for his services the sum of $125,000.00 per year,
payable semi-monthly. Base compensation shall be reviewed annually by the
Compensation Committee of the Company. Employee shall also be eligible to
periodic stock option grants subject to the discretion of the Compensation
Committee of the Board of Directors. Concurrently with Employee's hire, Employee
shall be granted options to purchase 2,500 shares of Company's common stock at
the exercise price equal to the closing price of Company's common stock on the
date of the grant with vesting as set forth in the Plan.

         6. Employee's Incentive Pay. In addition to the compensation set forth
in Section 5 hereof, an EBITDA incentive compensation bonus shall be available
to Employee for each of the years of Employee's employment and shall be computed
from the following formula based on CCI's financial performance. The bonus
payments ("Payments") shall be calculated on a cumulative basis with respect to
each calendar year period as described below, beginning April 1, 1999, and shall
be paid, subject to the restrictions of such payment contained in this Agreement
and subject to applicable federal and local income tax and other payroll
withholding requirements, as follows: eighty percent (80%) of the amount payable
with respect to Employee shall be paid on or before January 31st of the
following year, and the balance shall be paid on the earlier of May 31st or the
date on which the audited financial statements for the Company which includes
the results for CCI for the applicable calendar year are issued by Company's
independent auditors. All amounts payable shall be paid directly to the
Employee, provided Employee is employed by the Company.

         The Payments with respect to each calendar year (the "Period Payment")
shall be a percentage (the "Allocable Percentage") of Employee's base salary as
set forth in Section 5 of this Agreement for such year determined in accordance
with the level


<PAGE>   3


(the "Applicable Earnings Level") of earnings (taking into account Payments made
hereunder) before interest, taxes, depreciation and amortization ("EBITDA") of
CCI for such Period. The Applicable Earnings Level shall be a percentage of the
management case level of EBITDA during any Period (the "Management Case
EBITDA"), as listed on Schedule 6 attached hereto, and the corresponding
Allocable Percentage for each Applicable Earnings Level shall be as listed on
Schedule 6. Actual EBITDA with respect to any Period shall be determined by the
Company based on the financial statements of CCI, included in the audited
financial statements of the Company.

         7. Expense Reimbursement. The Company will reimburse the Employee, at
least semi-monthly, for all reasonable and necessary expenses, including without
limitation, travel expenses, and reasonable entertainment expenses, incurred by
him in carrying out his duties under this Agreement. The Employee shall present
to the Company each month an account of such expenses in such form as is
reasonably required by the Board of Directors.

         8. Medical and Dental Coverage. Commencing with employment, the
Employee will be entitled to participate in the Company's employee group medical
and other group insurance programs on the same basis as other employees of the
Company.

         9. Medical Examination. The Employee agrees to submit himself for
physical examination on one occasion per year as requested by the Company for
the purpose of the Company's obtaining life insurance on the life of the
Employee for the benefit of the Company as may be required; provided, however,
that the Company shall bear the entire cost of such examinations and shall pay
all premiums on any key man life insurance obtained for the benefit of the
Company as beneficiary or with respect to any other designated beneficiary.

         10. Vacation Time. The Employee shall be entitled each year to a
reasonable vacation in accordance with the established practices of the Company,
now or hereafter in effect for the executive personnel, during which time the
Employee's compensation shall be paid in full.

         11. Benefits Payable on Disability. If the Employee becomes disabled
such that he is unable to properly perform services hereunder by reason of
illness or other physical or mental incapacity, the Company shall continue to
pay the Employee


<PAGE>   4


his then current salary hereunder for the first three (3) months of such
continuous disability commencing with the first date of such disability.

         12. Obligations of Employee During and After Employment.

               (a) The Employee agrees that during the terms of his employment
          under this Agreement, he will engage in no other business activities
          directly or indirectly, which are competitive with or which might
          place him in a competing position to that of the Company, or any
          affiliated company.

               (b) The Employee realizes that during the course of his
          employment, Employee will have produced and/or have access to
          confidential business plans, information, business opportunity
          records, notebooks, data, formula, specifications, trade secrets,
          customer lists, account lists and secret inventions and processes of
          the Company and its affiliated companies. Therefore, during or
          subsequent to his employment by the Company, or by an affiliated
          company, the Employee agrees to hold in confidence and not to directly
          or indirectly disclose or use or copy or make lists of any such
          information, except to the extent authorized by the Company in
          writing. All records, files, business plans, documents, equipment and
          the like, or copies thereof, relating to Company's business, or the
          business of an affiliated company, which Employee shall prepare, or
          use, or come into contact with, shall remain the sole property of the
          Company, or of an affiliated company, and shall not be removed from
          the Company's or the affiliated company's premises without its written
          consent, and shall be promptly returned to the Company upon
          termination of employment with the Company and its affiliated
          companies. The restrictions and obligations of Employee set forth in
          this Section 12(b) shall not apply to (i) information that is or
          becomes generally available and known to the industry (other than as a
          result of a disclosure directly or indirectly by Employee); or (ii)
          information that was known to Employee prior to Employee's employment
          by the Company or its predecessor.

               (c) Because of his employment by the Company, Employee shall have
          access to trade secrets and confidential information about the
          Company, its business plans, its business accounts, its business
          opportunities, its expansion

<PAGE>   5


          plans into other geographical areas and its methods of doing business.
          Employee agrees that for a period of two (2) years after termination
          or expiration of his employment, he will not, directly or indirectly,
          compete with the Company in its then present business or anticipated
          lines in the aviation business. Further, for the same two (2) year
          period, Employee shall not hire or entice to hire any employees of
          Company to any other business Employee may pursue following
          termination or expiration of employment.

               (d) In the event a court of competent jurisdiction finds any
          provision of this Section 12 to be so overbroad as to be
          unenforceable, then such provision shall be reduced in scope by the
          court, but only to the extent deemed necessary by the court to render
          the provision reasonable and enforceable, it being the Employee's
          intention to provide the Company with the broadest protection possible
          against harmful competition.

         13. Termination for Cause by the Company. The Company may, without
liability, terminate the Employee's employment hereunder for cause at any time
upon written notice from the Board of Directors specifying such cause, and
thereafter the Company's obligations hereunder shall cease and terminate;
provided, however, that such written notice shall not be delivered until after
the Board of Directors shall have given the Employee written notice specifying
the conduct alleged to have constituted such cause and the Employee has failed
to cure such conduct, if curable, within fifteen (15) days following receipt of
such notice.

         Grounds for termination "for cause" are one or more of the following:

               (a) A willful breach of a material duty by the Employee during
          the course of his employment;

               (b) Habitual neglect of a material duty by the Employee;

               (c) Action or inaction by the Employee which places the Company
          in circumstances of financial peril;

               (d) Fraud on the Company or conviction of a felony involving or
          against the Company; and

<PAGE>   6


               (e) Ownership or operation of any other closely-held corporation
          or business entity actively engaged in the aviation or aviation parts
          business.

         14. Termination by the Employee or the Company Without Cause.

               (a) The Employee, without cause, may terminate this Agreement
          upon 90 days prior written notice to the Company. In such event, the
          Employee shall be required to render the services required under this
          Agreement during such 90-day period unless otherwise directed by the
          Board of Directors. Compensation for vacation time not taken by
          Employee shall be paid to the Employee at the date of termination.
          Employee shall be paid for only the ninety (90) day period pursuant to
          normal pay practices and then all obligations hereunder regarding
          compensation in any form shall cease.

               (b) The Company, without cause, may terminate this Agreement. In
          such event, the Company shall pay a severance allowance equal to the
          balance of the contract payable over the term of the contract at
          regular monthly installments unless the parties negotiate a mutually
          acceptable discounted lump sum. No other benefits will be provided
          once this Agreement is terminated and all other obligations hereunder
          regarding compensation in any form shall cease.

         15. Termination upon Death of Employee. In addition to any other
provision relating to the termination, this Agreement shall terminate upon the
Employee's death. In such event, the Company shall pay a severance allowance
equal to one hundred eighty (180) days' salary to the Employee's estate, which
may be covered by an insurance policy.

         16. Arbitration. Any controversy, dispute or claim arising out of, or
relating to, this Agreement and/or its interpretation shall, unless resolved by
agreement of the parties, be settled by binding arbitration in Charlotte, North
Carolina in accordance with the Rules of the American Arbitration Association
then existing. This Agreement to arbitrate shall be specifically enforceable
under the prevailing arbitration law of the State of South Carolina. The award
rendered by the arbitrators shall be final and judgment may be entered upon the
award in any court of the State of South Carolina having jurisdiction of the
matter.

<PAGE>   7


         17.  General Provisions.

               (a) The Employee's rights and obligations under this Agreement
          shall not be transferrable by assignment or otherwise, nor shall
          Employee's rights be subject to encumbrance or to the claims of the
          Company's creditors. Nothing in this Agreement shall prevent the
          consolidation of the Company with, or its merger into, any other
          corporation, or the sale by the Company of all or substantially all of
          its property or assets.

               (b) This Agreement and the rights of Employee with respect to the
          benefits of employment referred to herein constitute the entire
          Agreement between the parties hereto in respect of the employment of
          the Employee by the Company and supersede any and all other agreements
          either oral or in writing between the parties hereto with respect to
          the employment of the Employee. The parties however acknowledge a
          separate Confidentiality and Noncompetition Agreement which shall
          stand on its own separate and apart from this Agreement.

               (c) The provisions of this Agreement shall be regarded as
          divisible, and if any of said provisions or any part thereof are
          declared invalid or unenforceable by a court of competent jurisdiction
          or in an arbitration proceeding, the validity and enforceability of
          the remainder of such provisions or parts thereof and the
          applicability thereof shall not be affected thereby.

               (d) This Agreement may not be amended or modified except by a
          written instrument executed by Company and Employee.

               (e) This Agreement and the rights and obligations hereunder shall
          be governed by and construed in accordance with the laws of the State
          of South Carolina.

         18. Construction. Throughout this Agreement the singular shall include
the plural, and the plural shall include the singular, and the masculine and
neuter shall include the feminine, wherever the context so requires.

         19. Text to Control. The headings of paragraphs and sections are
included solely for convenience of reference. If any conflict between any
heading and the text of this Agreement exists, the text shall control.

<PAGE>   8


         20. Authority. The officer executing this agreement on behalf of the
Company has been empowered and directed to do so by the Board of Directors of
the Company.

         21. Effective Date. This Agreement shall be effective on as of the date
cited above.


FOR THE COMPANY:                    AMERICAN AIRCARRIERS SUPPORT,
                                    INCORPORATED


Dated April 1, 1999                 By  /s/ Joseph E. Civiletto
      ----------------------           -----------------------------
                                    Title: President
                                          --------------------------


FOR THE EMPLOYEE:


Dated April 1, 1999                     /s/ Frank Zambo              (SEAL)
      ---------------------            -----------------------------
                                       FRANK ZAMBO

<PAGE>   1
                                                                 EXHIBIT 10.5.10


                                  850 E. TETON
                               INDUSTRIAL SUBLEASE


       EFFECTIVE DATE:     JANUARY 1, 1998



PARTIES AND ADDRESSES:


          "AUTHORITY":   TUCSON AIRPORT AUTHORITY, INC.,
                          an Arizona nonprofit corporation
                         7005 S. Plumer Avenue
                         Tucson, Arizona 85706


             "TENANT":   COMPLETE CONTROLS INC.
                          AN ARIZONA CORPORATION
                         850 E. TETON RD. SUITE 8
                         TUCSON, ARIZONA 85706


             EXHIBITS:   Exhibits lettered A and B are annexed to this Sublease
                         and incorporated herein by this reference.



<PAGE>   2


                                    RECITALS

A.       Authority has leased from the City of Tucson, a municipal corporation,
         the airport known as Tucson International Airport located in Pima
         County, State of Arizona (the "Airport").

B.       Tenant desires to sublease from Authority a portion of the Airport and
         to have certain rights, licenses, services and privileges in connection
         with the Airport.

                            COVENANTS AND CONDITIONS

                              ARTICLE I - PREMISES


1.1      PREMISES

         Authority does hereby demise and let unto Tenant, for its exclusive use
         and occupancy, and Tenant does hereby lease from Authority, the portion
         of the Airport that is illustrated on the attached Exhibit A, of the
         Building (the "Building"), located at 850 E. TETON RD on the Airport
         (the "Premises"), THIRTY EIGHT THOUSAND FOUR HUNDRED (38,400) SQUARE
         FEET IN THE NORTH END OF HANGAR ONE AND THREE THOUSAND FIVE HUNDRED
         (3,500) SQUARE FEET OF OFFICE SPACE DIRECTLY EAST OF HANGAR ONE subject
         to all utility easements and rights of way that encumber the Premises
         and subject to the terms hereof..

1.2      ACCESS

         Tenant is granted the right of reasonable access to the Premises over
         such other portions of the Airport and the Building as are necessary to
         provide reasonable access to and from the Premises. Authority reserves
         the right to designate the location of such access and to change its
         location from time to time, as Authority deems reasonably necessary and
         appropriate.

1.3      SECURITY

         By signing this Sublease, Tenant is deemed to acknowledge and is hereby
         advised that the Building houses a number of rental spaces and diverse
         tenants. Tenant is responsible for securing Tenant's Premises, and
         neither the Authority nor its agents or employees will be responsible
         for any loss of or damage to Tenant's possessions while stored on the
         Premises.

1.4      PARKING

         Tenant shall be entitled to utilize the parking areas associated with
         the Building in common with other Tenants. The Authority reserves the
         right, but shall not be obligated, to assign specific parking spaces to
         tenants.


                                     Page 1
<PAGE>   3


1.5      ENTRY UPON PREMISES

         Authority may enter upon the Premises subleased exclusively to Tenant
         hereunder at any reasonable time, for any purpose necessary, incidental
         to or connected with the exercise of its governmental functions, or to
         inspect the Premises for compliance with all applicable laws and rules
         and regulations or to prevent waste, loss or destruction. Authority
         shall, in addition, have the right to enter upon the Premises and
         perform any actions necessary or appropriate in connection with any
         environmental investigation or remediation, including but not limited
         to the trenching, drilling and installation, monitoring, repair,
         replacement and operation of pipes, wells, and related equipment. The
         rent due hereunder shall equitably abate with respect any portion of
         the Premises rendered unusable as a result of the Authority's exercise
         of its rights under this Section.

                                ARTICLE II - TERM


2.1      TERM

         The term of this Sublease shall be for a period of TWO YEARS beginning
         on the Effective Date of this Sublease as indicated on page one (1)
         hereof, and continuing through DECEMBER 31, 1999.

                         ARTICLE III - RENT AND DEPOSITS


3.1      BASE RENT

         Tenant covenants and agrees to pay Authority rent from the Effective
         Date until the expiration of the term of this Sublease in an amount
         equal to $8,695.00 per month (38,400sq @ .20 and 3,500sf @ .29) due and
         payable to Authority in advance. Rent payments shall be delivered to
         Authority's Property Manager who is currently Tucson Industrial
         Centers, Inc., located at 850 E. Teton, Suite 1, Tucson, AZ 85706, or
         such other person as directed by Authority in writing.

3.2      COMMENCEMENT OF RENTAL OBLIGATION

         The first monthly payment, prorated to reflect the partial month for
         which it is paid, shall be due on the Effective Date hereof and
         subsequent installments shall be due on the first day of each
         succeeding calendar month thereafter during the term of this Sublease.

3.3      LATE FEES

         If any rent or any other sum due from the Tenant shall not be received
         within FIVE (5) DAYS after such amount shall be due, Tenant shall pay a
         late fee equal to TEN PERCENT (10%) of such overdue amount. Acceptance
         of such late fees shall in no event constitute a waiver of Tenant's
         default with respect to such overdue amount nor prevent Authority from
         exercising any of the other right and remedies granted hereunder.


                                     Page 2
<PAGE>   4


3.4      SECURITY DEPOSIT

         Simultaneously with the entry into this Sublease by the parties hereto,
         the Tenant shall deposit with Authority $5,000.00, which shall be
         retained by Authority as security for the Tenant's payment of the Rent
         and performance of all of its other obligations under the provisions of
         this Lease, and shall not be deemed to represent payment of any rent.
         On the occurrence of an Event of Default (as defined in Section XI.1
         hereinbelow), Authority shall be entitled, at its sole discretion, (a)
         to apply any or all of such sum in payment of (i) any Rent due and
         unpaid, (ii) any expense incurred by Authority in curing any such
         default, and/or (iii) any damages incurred by Authority by reason of
         such default (including, by way of example rather than by limitation,
         reasonable attorney's fees), in which event the Tenant shall,
         immediately on its receipt of a written demand there for from
         Authority, pay to Authority a sum equaling the amount so applied, so as
         to restore the security deposit to its original amount; and /or (b) at
         Authority's election, to retain any or all of such sum not otherwise
         applied pursuant to the provisions of clause (a) of this sentence in
         liquidation of any or all damages suffered by Authority by reason of
         such default. On the termination of this Sublease, any of such sum
         which is not so applied or retained shall be returned to Tenant. Such
         sum shall not bear interest while being held by Authority.

                          ARTICLE IV - USE OF PREMISES


4.1      PURPOSES

         The Premises shall not, without prior written consent of Authority, be
         used for any purpose other than or in addition to that set forth on
         Exhibit B attached hereto.

4.2      INDEMNITY

         Tenant agrees to fully indemnify and save and hold harmless Authority
         and the City of Tucson from and against all claims, fines, damages,
         penalties, actions and all expenses, including reasonable attorneys'
         fees incidental to the investigation and defense thereof, related to or
         arising out of the fault or negligence of or violation of law by
         Tenant, its agents, employees or subtenants in the use, occupancy, or
         maintenance of the Premises by any of them.

4.3      DANGEROUS CONDITIONS

         Tenant agrees to exercise reasonable care when using the Premises and
         all improvements thereon to discover and promptly remedy any conditions
         that may pose an unreasonable risk of harm to members of the general
         public or that may constitute a violation of law. If an unsafe,
         defective or dangerous condition, or violation of the law is
         discovered, Tenant warrants that no one other than Tenant and Authority
         employees, agents and representatives will be admitted to the Premises
         and no property belonging to any party other than Tenant and Authority
         will be transported to, collected at or stored upon the Premises until
         the unsafe, defective or dangerous condition, or violation of law is
         corrected.


                                     Page 3
<PAGE>   5


4.4      ALTERATIONS

         Tenant shall not construct or substantially alter or modify any
         buildings, structures, or other improvements on the Premises without
         the Authority's prior written approval of its plans and specifications,
         which approval may be withheld in the Authority's sole discretion.
         Without limiting the generality of the above consent requirement, no
         alterations may be made that are of such an extent or nature that they
         would subject the Premises or the Building or any part thereof to
         current building codes as they pertain to electrical, building, safety
         or fire (except to the extent that the Premises or Building are already
         subject to such codes) or would conflict with any restrictions on the
         alteration of the Building that might exist as a result of any
         registration or eligibility for registration on any historic register.

4.5      UTILITIES

         A.       Tenant's Responsibilities:

                  Tenant shall pay for all utility services supplied to it or
                  its subtenants on the Airport.

         B.       Authority's Rights and Responsibilities:

                  Notwithstanding the execution of this Sublease, Authority
                  retains the right to the continued use of such utility lines
                  and services as are presently on the Premises and the right to
                  repair the same when necessary. Authority shall conduct such
                  repairs in such manner and at such times as to not
                  unreasonably interfere with Tenant's operations.

4.6      MAINTENANCE AND REPAIR

         A.       Tenant:

                  (1)      Tenant shall, at no expense to Authority, maintain
                           the Premises in a neat, clean, safe condition and in
                           a manner that is compatible with the rest of the
                           Building, and in compliance with all applicable laws,
                           rules, regulations and orders.

                  (2)      General combustible storage shall not exceed 12 feet
                           in height.

                  (3)      Aisle separation shall be between 4 feet to 8 feet
                           wide. (Width to be determined by Fire Department and
                           classification of commodities being stored).

                  (4)      Must have stable storage piles (No leaning stacks).


                                     Page 4
<PAGE>   6


         B.       Authority:

                  Subject to Section 5.9 the Authority shall be responsible for
                  all structural repairs in the Premises and the Building unless
                  necessitated by any negligence or willful misconduct of Tenant
                  or Tenant's subtenants, employees, agents, invitees or guests.

                       ARTICLE V - INSURANCE AND CASUALTY


5.1      INSURANCE REQUIRED

         Tenant shall obtain and maintain in full force, with a company or
         companies authorized to transact the business of insurance in the State
         of Arizona and of sound and adequate financial responsibility, selected
         by Tenant and acceptable to Authority, comprehensive insurance policy
         (either as part of any other policy or policies carried by Tenant, or
         separately) providing for the protection of the Authority and the City
         of Tucson and officers, directors, agents and employees of either of
         them, against:

                  (1)      general liability, including all direct or contingent
                           loss or liability for damages for bodily injury,
                           personal injury, death or damage to property,
                           including loss of use thereof, occurring on or in any
                           way related to the Premises or occasioned by reason
                           of occupancy by and the operations of Tenant upon, in
                           and around the Premises, with limits of $1,000,000
                           per occurrence for personal injury or death or damage
                           to property, with coverage at least as broad as that
                           provided by INSURANCE SERVICES OFFICE COMMERCIAL
                           GENERAL LIABILITY COVERAGE form CG0001 (Occurrence
                           Form), and such policy or policies shall cover all of
                           Tenant's operations on the entire Premises, including
                           but not limited to any elevators and escalators
                           therein and any sidewalks, streets or other public
                           ways adjoining the Premises; and

                  (2)      automobile liability covering owned, non-owned,
                           leased and hired vehicles with combined single limits
                           of no less than $250,000 per occurrence.

5.2      DEDUCTIBLE

         The deductible for any policy required hereunder shall not exceed
         $1,000.

5.3      MODIFICATION OF REQUIREMENTS

         Authority may adjust or increase liability insurance amounts and
         requirements as Authority deems reasonably necessary, or as may be
         required because of changes in the insurance requirements imposed by
         Authority's insurer or by applicable law. Tenant shall comply with such
         adjustments or increases within such reasonable time period as is
         requested by Authority.


                                     Page 5


<PAGE>   7


5.4      CERTIFICATES

         Upon or prior to the commencement of the term of this Sublease and at
         least annually thereafter Tenant shall furnish to Authority
         certificates of insurance showing the amount and type of the insurance
         then in effect that is required to be procured and maintained by it
         hereunder and stating the date and term of the policies evidencing such
         insurance. Tenant shall, upon request, supply Authority with certified
         copies of all applicable insurance policies, riders, endorsements and
         declaration pages. Certificates evidencing any renewal, replacement or
         extension of any or all of the insurance required hereunder, or of
         renewals, replacements or extensions of such renewals, replacements or
         extensions, shall be delivered by Tenant to Authority not less than
         thirty (30) days prior to the expiration of any policy of insurance
         renewed, replaced or extended by the insurance represented by any such
         certificate. Each policy of insurance required hereunder shall provide
         for not less than thirty (30) days notice to Authority and Tenant
         before such policy may be canceled.

5.5      ADDITIONAL INSURANCE

         The provisions of this Sublease as to insurance required to be procured
         and maintained shall not limit or prohibit, or be construed as limiting
         or prohibiting, Authority or Tenant from obtaining any other or greater
         insurance with respect to the Premises or improvements thereon or the
         use and occupancy thereof that either or both of them may wish to
         carry, but in the event Authority or Tenant, as the case may be, shall
         procure or maintain any such insurance not required by this Sublease,
         the cost thereof shall be at the expense of the party procuring or
         maintaining the same.

5.6      ADDITIONAL INSUREDS

         All insurance required by this Article shall be procured and maintained
         in the name of Tenant and shall add Authority and the City of Tucson as
         additional insureds as their interests appear.

5.7      WAIVER OF SUBROGATION

         Each party hereto waives all claims for recovery from the other party
         for any loss or damage to any of its property on the Premises insured
         under valid and collectible insurance policies to the extent of any
         recovery collected from such policies. The parties agree that all
         material insurance policies shall be endorsed with a clause which
         waives subrogation against the other party.

5.8      INSURANCE BY AUTHORITY

         Authority may, upon written notice to Tenant, in the event that Tenant
         fails to timely provide proof of insurance as required by Section 5.4
         above, procure and maintain any or all of the insurance required of
         Tenant under this Article. In such event, all costs of such insurance
         procured and maintained by Authority on behalf of Tenant shall be the
         responsibility of


                                     Page 6
<PAGE>   8


         Tenant and shall be fully reimbursed to Authority within ten (10)
         business days after Authority advises Tenant of the cost thereof.

5.9      CASUALTY TO PREMISES

         Authority may, but shall not be required to, maintain insurance against
         loss or damage to the Building and the Premises, but shall have no
         obligation to repair the Building or the Premises in the event of
         casualty or damage thereto. In the event that any such casualty renders
         the Premises unsafe or untenantable, this Sublease shall terminate
         immediately.

                               ARTICLE VI - TAXES


6.1      TENANT'S RESPONSIBILITY

         Tenant shall pay before delinquency any and all taxes levied or
         assessed against the Premises, any levied or assessed against or by
         reason of personal property located in, on or about the Premises, any
         levied or assessed because of Tenant's right to possession of the
         Premises and improvements thereon, all applicable taxes levied or
         assessed by any government body as the result of Tenant's operations
         and all taxes which may be levied or assessed as the result of rentals
         payable under this Sublease. All such taxes and assessments for partial
         years shall be apportioned and adjusted on a time basis.

6.2      PROTEST

         Tenant shall have the right at its own cost and expense to contest the
         amount or validity of any such tax or assessment and to bring or defend
         any actions involving the amount or validity of any such tax or
         assessment in its own name or in the name of Authority; provided that,
         if unsuccessful, Tenant shall pay and discharge any such tax or
         assessment so contested, together with any penalties, fines, interest,
         costs and expenses, including reasonable attorneys' fees, that may
         result from any such action by Tenant.

                    ARTICLE VII - RULES, REGULATIONS AND LAWS


7.1      COMPLIANCE WITH ALL APPLICABLE LAWS

         Tenant and all persons operating under the rights granted hereby shall
         observe and obey all reasonable and lawful rules and regulations with
         respect to the use of the Airport which have been or may in the future
         be adopted by Authority and shall further abide by all applicable laws,
         statutes, ordinances, rules, orders, and regulations of all governing
         bodies which are now in effect or which may hereafter be put into
         effect.


                                     Page 7
<PAGE>   9

7.2      NON-DISCRIMINATION

         A.       NON-DISCRIMINATION COVENANTS

                  (1)      The Tenant for himself, his heirs, personal
                           representatives, subtenants, successors in interest,
                           and assigns, as a part of the consideration hereof,
                           does hereby covenant and agree, as a covenant running
                           with the land, that in the event improvements are
                           constructed, maintained, or otherwise operated on the
                           Premises for a purpose for which a Department of
                           Transportation ("DOT") program or activity is
                           extended or for another purpose involving the
                           provision of similar services or benefits, Tenant
                           shall maintain and operate such improvements and
                           services in compliance with all other requirements
                           imposed pursuant to Title 49, Code of Federal
                           Regulations, DOT, Subtitle A, Office of the
                           Secretary, Part 21, Nondiscrimination in
                           Federally-Assisted Programs of the Department of
                           Transportation-Effectuation of Title VI of the Civil
                           Rights Act of 1964, and as said Regulations may be
                           amended.

                  (2)      The Tenant for himself, his personal representatives,
                           successors in interest, and assigns, as a part of the
                           consideration hereof, does hereby covenant and agree,
                           as a covenant running with the land that: (1) no
                           person on the grounds of race, color, or national
                           origin shall be excluded from participation in,
                           denied the benefits of, or be otherwise subjected to
                           discrimination in the use of said improvements, (2)
                           that in the construction of any improvements on,
                           over, or under such land and the furnishing of
                           services thereon, no person on the grounds of race,
                           color, or national origin shall be excluded from
                           participation in, denied the benefits of, or
                           otherwise be subject to discrimination, (3) that
                           Tenant shall use the Premises in compliance with all
                           other requirements imposed by or pursuant to Title
                           49, Code of Federal Regulations, Department of
                           Transportation, Subtitle A, Office of the Secretary,
                           Part 21, Non-discrimination in Federally-Assisted
                           Programs of the Department of
                           Transportation-Effectuation of Title VI of the Civil
                           Rights Act of 1964, and as said Regulations may be
                           amended.

                  (3)      Tenant shall furnish its accommodations and/or
                           services on a fair, equal and not unjustly
                           discriminatory basis to all users thereof and it
                           shall charge fair, reasonable and not unjustly
                           discriminatory prices for each unit or service,
                           PROVIDED THAT Tenant may be allowed to make
                           reasonable and nondiscriminatory discounts, rebates
                           or other similar type of price reductions to volume
                           purchasers.

                  (4)      Tenant assures that it will undertake an affirmative
                           action program as required by 14 CFR Part 152,
                           Subpart E, to insure that no person shall on the
                           grounds of race, creed, color, national origin, or
                           sex be excluded from participating in any employment
                           activities covered in 14 CFR Part 152, Subpart E.
                           Tenant assures that it will require that its covered
                           sub organizations provide assurances from their sub
                           organizations, as required by 14 CFR Part 152,
                           Subpart E, to the same effort.


                                     Page 8
<PAGE>   10


         B.       NON-COMPLIANCE

                  Non-compliance with an provision of this Section shall
                  constitute a material breach hereof and in the event of such
                  non-compliance Authority shall have the right to terminate
                  this Sublease and the estate hereby created without liability
                  therefore or at the election of Authority or the United
                  States, either or both shall have the right to judicially
                  enforce these provisions.

         C.       SUBLEASES

                  Tenant agrees that it shall insert the provisions of this
                  Section in any sublease by which Authority grants a right or
                  privilege to any person, firm or corporation to render
                  accommodations and/or services to the public on the Premises
                  herein subleased.

7.3      COMPLIANCE WITH FAR PART 77

         Tenant shall comply with the notification and review requirements
         covered in Part 77 of the Federal Aviation Regulations in connection
         with any improvements or modification or alteration of improvements on
         the Premises.

7.4      FAR PART 107; AIRPORT ACCESS

         Tenant and all persons operating under the rights granted hereunder
         shall comply with Part 107 of the Federal Aviation Regulations with
         respect to aircraft operations and airport security at the Airport.
         Tenant shall at all times take all reasonable steps to control, police
         and regulate the use of the Premises and of the Airport premises to
         prevent unauthorized persons and the general public from obtaining
         access to the Airport. Such steps by Tenant shall include, but not be
         limited to, steps requested by Authority and those required under
         Federal Regulations. Tenant must secure the Premises so that there is
         no inadvertent or purposeful unauthorized entry in or upon the Airport
         by people, vehicles, or animals.

7.5      STATE AND FEDERAL AVIATION REGULATIONS

         Tenant will conduct its operations and activities on the Airport so as
         to conform to all applicable regulations of the Federal Aviation
         Administration and the Aeronautics Division of the Arizona Department
         of Transportation.

7.6      EXCLUSIVE RIGHTS PROHIBITED

         It is understood and agreed that nothing herein contained shall be
         construed to grant or authorize the granting of an exclusive right
         within the meaning of Section 49 U.S.C.
         40103(e).

7.7      ENVIRONMENTAL LAWS

         Tenant, at its own expense, shall ensure that Tenant and Tenant's
         agents, employees, invitees, and sublessee comply with all present and
         hereafter enacted Environmental Laws, and any amendments thereto,
         affecting Tenant's operation on the Premises.


                                     Page 9
<PAGE>   11


         A.       DEFINITIONS

                  (1)      "Environmental Laws" means any laws, regulations and
                           ordinances (whether enacted by the local, state,
                           federal government, or by the Authority) now in
                           effect or hereafter enacted that deal with the
                           regulation or protection of the environment
                           (including the ambient air, ground water, surface
                           water, and land use, including sub-strata land), or
                           with the generation, storage, disposal or use of
                           chemicals or substances that could be detrimental to
                           human health or the environment.

                  (2)      "Extremely Hazardous Substances" means any substance
                           or material designated by the United States
                           Environmental Protection Agency as an "extremely
                           hazardous substance" under Section 302(a)(2) of the
                           Superfund Amendment and Reauthorization Act ("SARA")
                           (42 U.S.C. Section 11002(a)(2)).

                  (3)      "Hazardous Material" means all substances, materials
                           and wastes that are, or that become, regulated under,
                           or that are classified as hazardous or toxic under
                           any environmental law (including, but not limited to,
                           Extremely Hazardous Substances and Toxic Chemicals).

                  (4)      "Release" means any releasing, spilling, leaking,
                           pumping, pouring, emitting, emptying, discharging,
                           injecting, escaping, leaching, disposing, or dumping.

         B.       COMPLIANCE

                  (1)      Compliance with Environmental Laws Generally. Tenant
                           shall not cause or permit any Hazardous Material to
                           be used, generated, manufactured, produced, stored,
                           brought upon, or released, on, under or about the
                           Premises, or transported to and from the Premises, by
                           Tenant, its agents, employees, contractors, invitees,
                           sublessees or any third party in violation of any
                           Environmental Law, provided that, in no circumstances
                           shall Tenant cause or permit any Extremely Hazardous
                           Substance or Toxic Chemical to be used, generated,
                           manufactured, produced, stored, brought upon, or
                           Released, on, under or about the Premises, or
                           transported to and from the Premises.

                  (2)      Cleanup. Without limiting the foregoing, if the
                           presence of any Hazardous Material on, under or about
                           the Premises caused or permitted by Tenant results in
                           any contamination of the Premises, Tenant shall
                           promptly take all actions at its sole cost and
                           expense as are necessary to return the Premises to
                           the condition existing prior to the introduction of
                           any such Hazardous Material to the Premises; provided
                           that Authority's approval of such actions shall first
                           be obtained, which approval shall not be unreasonably
                           withheld so long as such actions would not
                           potentially have any material adverse effect on the
                           Premises. In the event Tenant shall fail timely to
                           commence or cause to be commenced or fail diligently
                           to prosecute to completion such actions as are
                           necessary to return the Premises to the conditions
                           existing prior to the introduction of any Hazardous
                           Material to the Premises, Authority may, but shall
                           not be obligated to, cause such action to be
                           performed, and all costs and expenses (including,
                           without limitation, attorneys' fees) thereof or
                           incurred by Authority in connection therewith shall
                           be paid by Tenant.


                                     Page 10
<PAGE>   12


                  (3)      Governmental Submittals. Tenant shall, at Tenant's
                           own cost and expense, make all submissions to,
                           provide all information to, and comply with all
                           requirements of any governmental authority having
                           jurisdiction (the "Government") under the
                           Environmental Laws. Should the Government determine
                           that a site characterization, site assessment and/or
                           a cleanup plan be prepared or that a cleanup should
                           be undertaken because of any release of hazardous
                           materials at the Premises which occur during the term
                           of this Sublease, then Tenant shall, at Tenant's own
                           cost and expense, prepare and submit the required
                           plans and financial assurances, and carry out the
                           approved plans in accordance with all requirements of
                           the Government.

                  (4)      Information Sharing. Tenant shall provide to Tucson
                           Airport Authority a copy of any and all information,
                           reports, and applications submitted to the Government
                           as described in Paragraph X.6B.(4), whether such
                           submittal is routine or in response to a release or
                           threatened release of any Hazardous Material, and
                           whether the impetus for such submittal is generated
                           by Tenant, or by an inquiry or action by the
                           Government or another third party. At no cost or
                           expense to Authority, Tenant shall promptly provide
                           all information requested by Authority to determine
                           the applicability of the Environmental Laws to the
                           Premises, or to respond to any governmental
                           investigation or to respond to any claim of liability
                           by third parties which is related to environmental
                           contamination. Tenant shall immediately notify
                           Authority of any correspondence or communication from
                           any governmental entity regarding the application of
                           Environmental Laws to the Premises or Tenant's
                           operation of the Premises.

                  (5)      Change in Use of Premises. Tenant shall immediately
                           notify Authority of any changes in Tenant's operation
                           on the Premises that will change or has the potential
                           to change Tenant's or Authority's obligations or
                           liabilities under the Environmental Laws.

         C.       INDEMNITY

                  Tenant shall indemnity, defend and hold harmless Authority,
                  its successors and assigns, its employees, agents and
                  attorneys from and against any and all liability, loss,
                  damage, expense, penalties and costs (including legal and
                  investigation fees or costs) arising from or related to any
                  claim or action for injury, liability, breach or warranty or
                  representation, or damage to persons or property and any and
                  all claims or actions brought by any party or governmental
                  body, alleging or arising in connection with (i) contamination
                  of, or adverse effects on, the environment (whether known,
                  alleged, potential, or threatened), or (ii) alleged or
                  potential violation of any Environmental Law or other statute,
                  ordinance, rule, regulation, judgment or order of any
                  government or judicial entity which are brought as a result
                  (whether in part or in whole) of any activity or operation on
                  or Release from the Premises (caused by


                                     Page 11
<PAGE>   13


                  any person or entity other than Authority) during the term of
                  this Sublease or any previous sublease of the Premises by
                  Tenant or its owners or related entities. This obligation
                  includes but is not limited to all costs and expenses related
                  to investigation and/or cleaning up the Premises and all land,
                  soil, and underground or surface water as required under the
                  law. Tenant's obligations and liabilities under this paragraph
                  shall continue so long as Authority bears any liability or
                  responsibility under the Environmental Laws for any action
                  that occurred on the Premises during the term of the Sublease.
                  This indemnification of Authority by Tenant includes, without
                  limitation, costs incurred in connection with any
                  investigation of site conditions or any cleanup, remedial,
                  removal or restoration work required by any federal, state, or
                  local governmental agency or political subdivision because of
                  Hazardous Material located on the Premises or present in the
                  soil or ground water on, under or about the Premises. The
                  parties agree that Authority's right to enforce Tenant's
                  Promise to indemnify is not an adequate remedy at law for
                  Tenant's violation of any provision of this paragraph;
                  Authority shall have all the rights and remedies set forth in
                  this Sublease as well as all other rights and remedies
                  provided by law.

         D.       SUBTENANTS

                  Tenant shall insert the provisions of this section in any
                  lease agreement or contract by which it grants a right or
                  privilege to any person, firm or corporation under this
                  Sublease.

                         ARTICLE VIII - SUPERIOR RIGHTS


8.1      AGREEMENTS WITH UNITED STATES

         This Sublease shall be subordinate to the provisions and requirements
         of any existing or future agreement between Authority and the United
         States, relative to the development, operation or maintenance of the
         Airport.

8.2      RIGHTS OF GOVERNMENT DURING WAR OR NATIONAL EMERGENCY

         This Sublease and all the provisions hereof shall be subject to
         whatever right the United States Government now has or in the future
         may have or acquire, affecting the control, operation, regulation and
         taking over of the Airport or the exclusive or non-exclusive use of the
         Airport by the United States during the time of war or national
         emergency.

         Tenant and Authority recognize that during the time of war or national
         emergency the City of Tucson, owner of the Airport, has the right to
         enter into agreements with the United States government for military or
         naval use of part or all of the Airport. If any such agreement is
         executed by the City of Tucson, the provisions of this Sublease,
         insofar as they are inconsistent with the provisions of any agreement
         so made by the City of Tucson with the United States government, shall
         be subject to the terms of such agreement and Tenant shall have no
         claim against Authority or the City of Tucson for any loss or damage
         sustained by


                                     Page 12
<PAGE>   14


         Tenant because of the making of such agreement by the City of Tucson.
         In such event, however, the amounts, if any, payable from the City of
         Tucson or the United States for improvements placed on the Premises by
         Tenant shall be paid to Tenant if this Sublease is in effect at the
         time of such taking.

8.3      RIGHTS OF AUTHORITY

         Authority reserves the right to further develop or improve the landing
         area of the Airport as it sees fit, regardless of the desires or view
         of Tenant and without interference or hindrance. Authority reserves the
         right, but shall not be obligated to Tenant, to maintain and keep in
         repair the landing area of the Airport and all publicly-owned
         facilities of the Airport, together with the right to direct and
         control all activities of Tenant in this regard.

8.4      AGREEMENTS WITH CITY OF TUCSON

         This Sublease is subject to the existing lease between Authority and
         the City of Tucson and to the provisions of any existing or future
         agreement between the City of Tucson and Authority.

8.5      ABATEMENT OF OBLIGATION TO CONSTRUCT OR REBUILD

         Inasmuch as this Sublease contains certain provisions concerning
         repairs, replacement and rebuilding of damaged or destroyed buildings,
         construction of buildings, quiet enjoyment and other related causes
         applicable to the parties to this Sublease, and inasmuch as the
         Premises constitute a portion of a public Airport, it is agreed that
         the parties hereto shall not be required to repair, replace, rebuild or
         construct any building or portion of any building so long as the
         obligated party is prevented from so doing by action of the United
         States government or any agency or department thereof.

                 ARTICLE IX - RESERVATION OF NAVIGATION EASEMENT


9.1      EASEMENT

         There is hereby reserved to Authority for the use and benefit of
         aircraft using the Airport a right of flight for the passage of
         aircraft in the airspace above the uppermost surface of the Premises,
         together with the right to cause such noise as may be inherent in the
         operation of any aircraft now known or hereafter used for navigation of
         or flight in said airspace, or landing at, or taking off from, or
         operating on the Airport.

9.2      STRUCTURES; ELEVATION LIMIT

         Tenant, by accepting this Sublease, expressly agrees for itself, its
         successors and assigns that it will not erect nor permit the erection
         of any structure or object, nor permit the growth of any tree on the
         Premises above the mean sea level elevation of 2460 feet. In the event
         the aforesaid covenants are breached, Authority reserves the right to
         enter upon the Premises and to remove the offending structure or object
         and cut the offending tree, all of which shall be at the expense of
         Tenant.


                                     Page 13
<PAGE>   15



9.3      PURPOSES

         Tenant, by accepting this Sublease agrees for itself, its successors
         and assigns that it will not make use of the Premises in any manner
         which might interfere with the landing and taking off of aircraft from
         the Airport or otherwise constitute a hazard. In the event the
         aforesaid covenant is breached, Authority reserves the right to enter
         upon the Premises and cause the abatement of such interference at the
         expense of Tenant.

                       ARTICLE X - ASSIGNMENT AND SUBLEASE


10.1     CONSENT OF AUTHORITY

         Tenant shall not sublease, assign or sell this Sublease or any interest
         therein, or any portion of the Premises, without first obtaining
         written consent from Authority. For this purpose, any change in
         ownership or control of Tenant shall be considered an assignment of
         rights hereunder. Tenant shall furnish the Authority with a copy of any
         sublease or assignment entered into with respect to this Sublease or
         the Premises or any portion thereof.

10.2     CONTINUING RESPONSIBILITY OF TENANT

         If it is a complete assignment or sublease of the entire Premises it
         shall be in writing and provide that the subtenant or assignee assumes
         and agrees to perform all of the terms, covenants and agreements which
         Tenant has agreed to perform under this Sublease, and that Tenant's
         subtenant or assignee shall become jointly and severally liable with
         Tenant, or any successor in interest of Tenant, for the performance of
         the terms and covenants of this Sublease. A sublease for less than the
         entire Premises shall be in writing and shall recite that it is subject
         and subordinate to all the terms and provisions of this Sublease.
         Neither the execution of such sublease or assignment, the Authority's
         consent to the same, nor the acceptance of rent by Authority from
         Tenant's subtenant or assignee shall release or in any manner affect
         Tenant's liability to Authority hereunder.

10.3     SUBJECT TO THIS SUBLEASE

         Any sublease between Tenant and a subtenant shall be in writing and
         shall provide that said sublease is subject to all the provisions of
         this Sublease.

                       ARTICLE XI - DEFAULTS AND REMEDIES


11.1     DEFAULT BY TENANT

         Tenant shall be in default under this Sublease upon the occurrence of
         any of the following "Events of Default":


                                     Page 14
<PAGE>   16



         A.       Tenant shall fail to pay when due any installment of rent
                  payable pursuant to this Sublease and such failure shall
                  continue unremedied for a period of ten (10) days; provided
                  that Tenant shall not be entitled to the benefit of more than
                  one (1) grace period of ten (10) days under this paragraph
                  A(1) within any calendar year.

         B.       Tenant or any of Tenant's agents, employees, guests, invitees,
                  or subtenants, shall use Premises for any unlawful or illegal
                  purpose or for any purpose other than those set forth on
                  Exhibit B.

         C.       Tenant shall fail to observe or perform any other covenant,
                  agreement or obligation hereunder and such failure shall not
                  be remedied within thirty (30) days (or such additional time
                  as is reasonably required in the opinion of Authority to
                  correct any such failure, if Tenant has instituted corrective
                  action and is diligently pursuing the same) after Authority
                  shall have given Tenant written notice specifying which
                  covenant, agreement or obligation Tenant has failed to observe
                  or perform; provided that Tenant shall not be entitled to the
                  benefit of more than two (2) grace periods of thirty (30) days
                  (or more if permitted) under this paragraph within any
                  calendar year.

         D.       There is commenced by or against Tenant any case under the
                  Bankruptcy Code (Title XI of the United States Code) or any
                  other bankruptcy, arrangement, reorganization, receivership,
                  custodianship or similar proceeding under any federal, state
                  or foreign law, and with respect to any such case or
                  proceeding that is involuntary, such case or proceeding is not
                  dismissed with prejudice within sixty (60) days of such
                  filing.

         E.       Tenant makes a general assignment for the benefit of creditors
                  or applies for, consents to, or acquiesces in the appointment
                  of a trustee, receiver, or other custodian for Tenant or the
                  property of Tenant or any part thereof, or in the absence of
                  such application, consent, or acquiescence, a trustee,
                  receiver or other custodian is appointed for Tenant or the
                  property of Tenant or any part thereof, and such appointment
                  is not discharged within sixty (60) days

         F.       Any action is commenced against Tenant to foreclose any lien
                  or mortgage or other rights of Tenant in or to the Premises.


         G.       Tenant abandons, deserts or vacates the Premises for seven (7)
                  consecutive days or more.

11.2     REMEDIES OF AUTHORITY

         If Tenant shall be in default hereunder as set forth above, the
         Authority may exercise any of the following remedies.

         A.       TERMINATION

                  Authority may, at its election, give Tenant written notice of
                  its intention to terminate this Sublease on a date which shall
                  not be earlier than ten (10) days after such notice


                                     Page 15
<PAGE>   17


                  is given. If all defaults have not been cured on or before the
                  date specified in the notice, Tenant's rights to possession of
                  the Premises shall cease, and with or without re-entry by
                  Authority, this Sublease and the term hereof shall terminate,
                  and Authority may then re-enter and take possession of the
                  Premises as provided below with respect to reentry without
                  termination. Any such termination must be express, and neither
                  notice to pay rent or to deliver up possession of the Premises
                  given pursuant to law, nor any proceeding instituted by
                  Authority, nor the failure by Tenant for any period of time to
                  pay any of the rent herein reserved, shall of itself operate
                  to terminate this Sublease.

                  (1)      Damages. Notwithstanding the termination of this
                           Sublease or any re-entry by Authority upon such
                           termination, Tenant shall continue to be liable for
                           and Authority shall be entitled to recover as
                           damages:

                           (a)      the sum of all rent that is due and owing as
                                    of the date of termination and all other
                                    sums then owing by Tenant hereunder;

                           (b)      all rent that would otherwise continue to
                                    accrue during the remaining term hereof or,
                                    at the election of Authority, the discounted
                                    present value of the sum of all rentals
                                    remaining to be paid for the remaining term
                                    of this Sublease, calculated by the
                                    Authority in its reasonable discretion; and

                           (c)      the reasonable costs incurred by Authority
                                    in re-letting the Premises and the
                                    reasonable costs to Authority necessary to
                                    place the Premises in condition for
                                    re-letting.

                  (2)      Credit. Any rent, income, receipts, profits or other
                           monies received or derived by Authority from any
                           re-letting or other use of the Premises after the
                           termination of this Sublease shall, so long as Tenant
                           shall continue to be liable for the payment of rent
                           hereunder, be credited against such rent as received
                           and collected.

         B.       REENTRY WITHOUT TERMINATION

                  As an alternative remedy, Authority may, without terminating
                  this Sublease, and after giving Tenant ten (10) days written
                  notice, re-enter the Premises and take possession thereof
                  pursuant to any legal proceedings or notice required by law,
                  in which event Tenant shall remain liable for the payment of
                  all rent and the performance of all conditions contained in
                  this Sublease.

                  (1)      Reentry. Upon any such re-entry of the Premises by
                           Authority, Authority may expel Tenant and those
                           claiming through or under Tenant and remove their
                           property and effects (forcibly, if necessary) without
                           being guilty in any manner of trespass and without
                           any liability therefor and without prejudice to any
                           remedies of Authority in the event of default by
                           Tenant, and without liability for any interruption of
                           the conduct of the affairs of Tenant or those
                           claiming through or under Tenant which may result
                           from such entry. Tenant hereby irrevocably appoints
                           Authority as the agent and attorney-in-fact of Tenant
                           to remove all of Tenant's property whatsoever
                           situated upon the


                                     Page 16
<PAGE>   18


                           Premises and to place such property in storage in any
                           warehouse or other suitable place in Tucson, Arizona,
                           for the account of and at the expense of Tenant and
                           Tenant hereby exempts and agrees to save harmless
                           Authority from any costs, loss or damage whatsoever
                           arising or occasioned by any such removal and storage
                           of such property by Authority or its duly authorized
                           agents in accordance with the provisions herein
                           contained.

                  (2)      Reletting. After such re-entry, Authority shall use
                           reasonable diligence to re-let the Premises, or any
                           part or parts thereof, for such period or periods and
                           upon such term or terms and at such reasonable rental
                           or rentals and upon such other conditions as
                           Authority may deem advisable, with the right to make
                           alterations and repairs to the Premises. Tenant
                           hereby irrevocably appoints Authority as the agent
                           and attorney-in-fact of Tenant to enter upon and
                           re-let the Premises and to incur any necessary
                           expenses in doing so, all to be reimbursed by Tenant.
                           Tenant agrees that no acts of Authority in effecting
                           such re-letting shall constitute a termination of
                           this Sublease, irrespective of the period for which
                           such re-letting is made or the terms and conditions
                           of such re-letting or otherwise.

                  (3)      Credit. Tenant shall receive a credit against such
                           rental in the amount of the proceeds, if any, of such
                           re-letting. Tenant's obligations, in addition to
                           rent, for which it shall remain liable include, but
                           shall not be limited to, all repossession costs,
                           brokerage commissions, legal expenses, attorneys'
                           fees, expenses of employees, removal costs,
                           alteration costs and expenses of preparation for
                           re-letting, and any other amounts expended pursuant
                           to action taken under this paragraph.

11.3     REMEDIES CUMULATIVE

         All rights, options and remedies of Authority contained in this
         Sublease shall be construed and held to be cumulative, and no one of
         them shall be exclusive of the other, and Authority shall have the
         right to pursue any one or all of such remedies or any other remedy or
         relief which may be provided by law, whether or not stated in this
         Sublease (including but not limited to any right of "self help" or
         similar remedy in order to minimize any damages, expenses, penalties
         and related fees or costs).

11.4     NO WAIVER

         No waiver of any Event of Default of Tenant hereunder shall be implied
         from any acceptance by Authority of any rent or other payments due
         hereunder or any omission by Authority to take any action on account of
         such default if such default persists or is repeated, and no express
         waiver shall affect an Event of Default in a manner other than as
         specified in said waiver. The consent or approval by Authority to or of
         any act by Tenant requiring Authority's consent or approval shall not
         be deemed to waive or render unnecessary Authority's consent or
         approval to or of any subsequent similar acts by Tenant.


                                     Page 17
<PAGE>   19


11.5     NOTICE

         Any default notice tendered to Tenant hereunder shall be deemed to be
         sufficient if it is reasonably calculated to put Tenant on inquiry as
         to the nature and extent of such default.

11.6     INTEREST

         All amounts due the Authority hereunder shall accumulate interest at a
         rate of 12% per annum or the maximum amount allowed by law, whichever
         is less.

                       ARTICLE XII - TERMINATION BY TENANT


12.1     TERMINATION EVENTS

         Tenant may terminate this Sublease at any time upon thirty (30) days
         written notice to Authority upon or after the happening or continuation
         of any of the following events:

                  A.       The inability of Tenant to use, for a period of
                           thirty (30) consecutive days, any portion of the
                           rights, licenses, services or privileges of Tenant
                           hereunder because of any law, rule, regulation or
                           other action or failure to act on the part of any
                           United States governmental authority having
                           jurisdiction thereof.

                  B.       The default by Authority in the performance of any
                           covenant or agreement herein required to be performed
                           by Authority and the failure of Authority to remedy
                           such default for a period of thirty (30) days after
                           receipt of written request or demand from Tenant to
                           remedy the same.

                  C.       The assumption by the United States government or any
                           authorized agency thereof of the operation or control
                           of the Airport or any part thereof, in such manner as
                           to substantially restrict Tenant for a period of at
                           least thirty (30) consecutive days from conducting
                           any of its operation on the Premises.

12.2     CURE

         If any of the foregoing reasons for termination by Tenant cease to
         exist prior to a termination, then the right to terminate for such
         reason shall cease.

12.3     NO WAIVER

         No waiver by Tenant of Authority's default of any of its obligations
         hereunder shall be construed to be or act as a waiver by Tenant of any
         subsequent default by Authority.


                                     Page 18


<PAGE>   20


          ARTICLE XIII - SURRENDER OF POSSESSION, CONDITION OF PREMISES


13.1     SURRENDER

         Upon the expiration or earlier termination of this Sublease or any
         extensions thereof, all rights herein granted to Tenant shall cease and
         terminate and Tenant shall forthwith surrender the Premises to
         Authority.

13.2     GOOD CONDITION

         The Premises shall be returned to Authority in as good condition as at
         the time of occupancy by Tenant, except as otherwise provided in this
         Sublease, ordinary wear and tear excepted.

13.3     REMOVAL OF PROPERTY

         Tenant, and Tenant's subtenants, may remove any and all personal
         property, including portable buildings, signs, trade fixtures,
         machinery and equipment from the Premises prior to expiration of this
         Sublease; provided, however, that Tenant shall repair any damage caused
         by such removal. Title to any property remaining in the Premises after
         expiration or termination of this Sublease shall vest in Authority and
         Authority shall have the right and option to remove the same, restore
         the Premises and recover from Tenant the costs and expenses of doing
         so.

                           ARTICLE XIV - MISCELLANEOUS


14.1     NOTIFICATION OF CHANGES

         Tenant shall promptly notify Authority of any change in Tenant's name
         or address or a change in ownership.

14.2     SUCCESSORS AND ASSIGNS BOUND

         All the terms, covenants and conditions of this Sublease shall extend
         to and bind the successors and assigns of the respective parties
         hereto.

14.3     ARTICLE HEADINGS

         The article headings contained herein are for convenience and reference
         and are not intended to define or limit the scope of any provisions of
         this Sublease.

14.4     SEVERABILITY

         If any term or condition of this Sublease shall be deemed to be invalid
         or unenforceable, all other terms and conditions shall remain in full
         force and effect.


                                     Page 19
<PAGE>   21


14.5     APPLICABLE LAW

         The terms and conditions of this sublease shall be interpreted in
         accordance with the laws of the State of Arizona.

14.6     CONSTRUCTION OF SUBLEASE

         Authority and Tenant agree that each party and its counsel have
         reviewed and revised this Sublease and that any rule of construction to
         the effect that ambiguities are to be resolved against the drafting
         party shall not apply in the interpretation of this Sublease. No remedy
         or election given by any provisions of this Sublease shall be deemed
         exclusive unless so indicated, but each shall, whenever possible, be
         cumulative with all other remedies in law or equity. Each provision
         hereof shall be deemed both a covenant and a condition and shall run
         with the land for the duration of the leasehold term or any extensions
         thereof. Whenever the content of any provision shall require it, the
         singular number shall be held to include the plural number and vice
         versa. The form of this Sublease contemplates that Tenant will be an
         entity and not one or more natural persons. If Tenant is one or more
         natural persons, then all pronouns referring to Tenant shall be deemed
         to be appropriately changed to fit those circumstances.

14.7     COSTS AND ATTORNEYS' FEES

         A.       AUTHORITY'S REVIEW

                  Tenant shall pay the expenses (including reasonable attorneys'
                  fees and the fees of other consultants) incurred by Authority
                  in reviewing any of the documents (including subleases, plans
                  and specifications of any improvements to be constructed by
                  Tenant, and documents created pursuant to Section ) for which
                  Authority's approval is required by the terms hereof.

         B.       ENFORCEMENT OF RIGHTS

                  The non-prevailing party shall promptly pay to the prevailing
                  party, upon demand, all costs and other expenses paid or
                  incurred by the prevailing party (including, without
                  limitation, reasonable attorney's fees) in enforcing or
                  exercising its rights or remedies created by, connected with
                  or provided for in this Sublease, whether or not any action or
                  proceeding is brought (including, without limitation, all such
                  costs, expenses and fees incurred in connection with any
                  bankruptcy, receivership, or other court proceedings [whether
                  at the trial or the appellate level]).

14.8     NOTICES

         A.       TO AUTHORITY

                  Notices to Authority in connection with this Sublease shall be
                  sufficiently served if physically delivered or sent by
                  certified mail, postage prepaid, addressed to Authority at the
                  address shown for it above.


                                     Page 20
<PAGE>   22


         B.       TO TENANT

                  Notices to Tenant in connection with this Sublease shall be
                  sufficiently served if physically delivered or sent by regular
                  mail, postage prepaid, addressed to Tenant at the address
                  shown for it above, provided that notice of utility
                  interference shall be sufficiently served if Authority gives
                  said notice to the current supervisor of Tenant's operations
                  on the Premises.

         C.       TIMING

                  Service of any notice or demand by physical delivery shall be
                  deemed complete upon the date of delivery. Service of any
                  notice or demand by certified mail shall be deemed complete at
                  the expiration of three (3) days after the date of the
                  certified mailing if mailed within the continental United
                  States.

         D.       CHANGE IN ADDRESS

                  Each party may change its address to such other addresses as
                  such party may designate to the other in writing from time to
                  time.

14.9     AUTHORITY TO EXECUTE

         Each party represents and warrants to the other that it has the right
         and authority to enter into this Sublease.

         IN WITNESS WHEREOF the parties have executed this Sublease as of the
         day and year first above written.

                                            TUCSON AIRPORT AUTHORITY, INC.,
                                               an Arizona nonprofit corporation

                                    By:        /s/ Signature Illegible
                                             -------------------------
                                    Its:       CEO
                                             -------------------------
                                            "AUTHORITY"

                                            COMPLETE CONTROLS,
                                               an Arizona Corporation

                                    By:        /s/ Micah Chapman
                                             -------------------------
                                    Its:       President
                                             -------------------------
                                            "TENANT"


                                     Page 21

<PAGE>   1
                                                                EXHIBIT 10.5.11

                                  850 E. TETON
                              INDUSTRIAL SUBLEASE







       EFFECTIVE DATE:                   JANUARY 1, 1999





PARTIES AND ADDRESSES:



          "AUTHORITY":                 TUCSON AIRPORT AUTHORITY, INC.,
                                        an Arizona nonprofit corporation
                                       7005 S. Plumer Avenue
                                       Tucson, Arizona 85706




             "TENANT":                 COMPLETE CONTROLS INC.
                                        AN ARIZONA CORPORATION
                                       850 E. TETON RD. SUITE 8
                                       TUCSON, ARIZONA 85706




             EXHIBITS:                 Exhibits lettered A and B are annexed to
                                       this Sublease and incorporated herein by
                                       this reference.






<PAGE>   2




                                    RECITALS

A.       Authority has leased from the City of Tucson, a municipal corporation,
         the airport known as Tucson International Airport located in Pima
         County, State of Arizona (the "Airport").

B.       Tenant desires to sublease from Authority a portion of the Airport and
         to have certain rights, licenses, services and privileges in
         connection with the Airport.

                            COVENANTS AND CONDITIONS


                              ARTICLE I - PREMISES


1.1      PREMISES

         Authority does hereby demise and let unto Tenant, for its exclusive
         use and occupancy, and Tenant does hereby lease from Authority, the
         portion of the Airport that is illustrated on the attached Exhibit A,
         of the Building (the "Building"), located at 850 E. TETON RD on the
         Airport (the "Premises"), THE OUTSIDE FENCED AREA NORTH OF HANGAR ONE
         AND APPROXIMATELY TWO THOUSAND SQUARE FEET ON THE EAST SIDE OF THE
         BUILDING subject to all utility easements and rights of way that
         encumber the Premises and subject to the terms hereof.

1.2      ACCESS

         Tenant is granted the right of reasonable access to the Premises over
         such other portions of the Airport and the Building as are necessary
         to provide reasonable access to and from the Premises. Authority
         reserves the right to designate the location of such access and to
         change its location from time to time, as Authority deems reasonably
         necessary and appropriate.

1.3      SECURITY

         By signing this Sublease, Tenant is deemed to acknowledge and is
         hereby advised that the Building houses a number of rental spaces and
         diverse tenants. Tenant is responsible for securing Tenant's Premises,
         and neither the Authority nor its agents or employees will be
         responsible for any loss of or damage to Tenant's possessions while
         stored on the Premises.

1.4      PARKING

         Tenant shall be entitled to utilize the parking areas associated with
         the Building in common with other Tenants. The Authority reserves the
         right, but shall not be obligated, to assign specific parking spaces
         to tenants.



                                     Page 1


<PAGE>   3



1.5      ENTRY UPON PREMISES

         Authority may enter upon the Premises subleased exclusively to Tenant
         hereunder at any reasonable time, for any purpose necessary, incidental
         to or connected with the exercise of its governmental functions, or to
         inspect the Premises for compliance with all applicable laws and rules
         and regulations or to prevent waste, loss or destruction. Authority
         shall, in addition, have the right to enter upon the Premises and
         perform any actions necessary or appropriate in connection with any
         environmental investigation or remediation, including but not limited
         to the trenching, drilling and installation, monitoring, repair,
         replacement and operation of pipes, wells, and related equipment. The
         rent due hereunder shall equitably abate with respect any portion of
         the Premises rendered unusable as a result of the Authority's exercise
         of its rights under this Section.

                               ARTICLE II - TERM


2.1      TERM

         This Sublease shall be a month-to-month tenancy beginning on the
         Effective Date hereof and continuing until terminated by either party
         with thirty (30) days' written notice to the other.

                        ARTICLE III - RENT AND DEPOSITS


3.1      BASE RENT

         Tenant covenants and agrees to pay Authority rent from the Effective
         Date until the expiration of the term of this Sublease in an amount
         equal to NINE HUNDRED DOLLARS AND NO CENTS ($900.00) per month ($500.00
         for fenced yard, $400.00 for 2,000 sq. ft.) due and payable to
         Authority in advance. Rent payments shall be delivered to Authority's
         Property Manager who is currently Tucson Industrial Centers, Inc.,
         located at 850 E. Teton, Suite 1, Tucson, AZ 85706, or such other
         person as directed by Authority in writing.

3.2      COMMENCEMENT OF RENTAL OBLIGATION

         The first monthly payment, prorated to reflect the partial month for
         which it is paid, shall be due on the Effective Date hereof and
         subsequent installments shall be due on the first day of each
         succeeding calendar month thereafter during the term of this Sublease.

3.3      LATE FEES

         If any rent or any other sum due from the Tenant shall not be received
         within FIVE (5) DAYS after such amount shall be due, Tenant shall pay a
         late fee equal to TEN PERCENT (10%) of such overdue amount. Acceptance
         of such late fees shall in no event constitute a waiver of Tenant's
         default with respect to such overdue amount nor prevent Authority from
         exercising any of the other right and remedies granted hereunder.

                                     Page 2


<PAGE>   4




3.4      SECURITY DEPOSIT

         Simultaneously with the entry into this Sublease by the parties
         hereto, the Tenant shall deposit with Authority $0.00, which shall be
         retained by Authority as security for the Tenant's payment of the Rent
         and performance of all of its other obligations under the provisions
         of this Lease, and shall not be deemed to represent payment of any
         rent. On the occurrence of an Event of Default (as defined in Section
         XI.1 hereinbelow), Authority shall be entitled, at its sole
         discretion, (a) to apply any or all of such sum in payment of (i) any
         Rent due and unpaid, (ii) any expense incurred by Authority in curing
         any such default, and/or (iii) any damages incurred by Authority by
         reason of such default (including, by way of example rather than by
         limitation, reasonable attorney's fees), in which event the Tenant
         shall, immediately on its receipt of a written demand there for from
         Authority, pay to Authority a sum equaling the amount so applied, so
         as to restore the security deposit to its original amount; and /or (b)
         at Authority's election, to retain any or all of such sum not
         otherwise applied pursuant to the provisions of clause (a) of this
         sentence in liquidation of any or all damages suffered by Authority by
         reason of such default. On the termination of this Sublease, any of
         such sum which is not so applied or retained shall be returned to
         Tenant. Such sum shall not bear interest while being held by
         Authority.

                          ARTICLE IV - USE OF PREMISES


4.1      PURPOSES

         The Premises shall not, without prior written consent of Authority, be
         used for any purpose other than or in addition to that set forth on
         Exhibit B attached hereto.

4.2      INDEMNITY

         Tenant agrees to fully indemnify and save and hold harmless Authority
         and the City of Tucson from and against all claims, fines, damages,
         penalties, actions and all expenses, including reasonable attorneys'
         fees incidental to the investigation and defense thereof, related to
         or arising out of the fault or negligence of or violation of law by
         Tenant, its agents, employees or subtenants in the use, occupancy, or
         maintenance of the Premises by any of them.

4.3      DANGEROUS CONDITIONS

         Tenant agrees to exercise reasonable care when using the Premises and
         all improvements thereon to discover and promptly remedy any
         conditions that may pose an unreasonable risk of harm to members of
         the general public or that may constitute a violation of law. If an
         unsafe, defective or dangerous condition, or violation of the law is
         discovered, Tenant warrants that no one other than Tenant and
         Authority employees, agents and representatives will be admitted to
         the Premises and no property belonging to any party other than Tenant
         and Authority will be transported to, collected at or stored upon the
         Premises until the

                                     Page 3


<PAGE>   5



         unsafe, defective or dangerous condition, or violation of law is
         corrected.

4.4      ALTERATIONS

         Tenant shall not construct or substantially alter or modify any
         buildings, structures, or other improvements on the Premises without
         the Authority's prior written approval of its plans and
         specifications, which approval may be withheld in the Authority's sole
         discretion. Without limiting the generality of the above consent
         requirement, no alterations may be made that are of such an extent or
         nature that they would subject the Premises or the Building or any
         part thereof to current building codes as they pertain to electrical,
         building, safety or fire (except to the extent that the Premises or
         Building are already subject to such codes) or would conflict with any
         restrictions on the alteration of the Building that might exist as a
         result of any registration or eligibility for registration on any
         historic register.

4.5      UTILITIES

         A.       Tenant's Responsibilities:

                  Tenant shall pay for all utility services supplied to it or
                  its subtenants on the Airport.

         B.       Authority's Rights and Responsibilities:

                  Notwithstanding the execution of this Sublease, Authority
                  retains the right to the continued use of such utility lines
                  and services as are presently on the Premises and the right
                  to repair the same when necessary. Authority shall conduct
                  such repairs in such manner and at such times as to not
                  unreasonably interfere with Tenant's operations.

4.6      MAINTENANCE AND REPAIR


         A.       Tenant:

                  (1)      Tenant shall, at no expense to Authority, maintain
                           the Premises in a neat, clean, safe condition and in
                           a manner that is compatible with the rest of the
                           Building, and in compliance with all applicable laws,
                           rules, regulations and orders.

                  (2)      General combustible storage shall not exceed 12 feet
                           in height.

                  (3)      Aisle separation shall be between 4 feet to 8 feet
                           wide. (Width to be determined by Fire Department and
                           classification of commodities being stored).

                  (4)      Must have stable storage piles (No leaning stacks).


                                     Page 4


<PAGE>   6



         B.       Authority:

                  Subject to Section 5.9 the Authority shall be responsible for
                  all structural repairs in the Premises and the Building
                  unless necessitated by any negligence or willful misconduct
                  of Tenant or Tenant's subtenants, employees, agents, invitees
                  or guests.

                       ARTICLE V - INSURANCE AND CASUALTY


5.1      INSURANCE REQUIRED

         Tenant shall obtain and maintain in full force, with a company or
         companies authorized to transact the business of insurance in the
         State of Arizona and of sound and adequate financial responsibility,
         selected by Tenant and acceptable to Authority, comprehensive
         insurance policy (either as part of any other policy or policies
         carried by Tenant, or separately) providing for the protection of the
         Authority and the City of Tucson and officers, directors, agents and
         employees of either of them, against:

                  (1)      general liability, including all direct or
                           contingent loss or liability for damages for bodily
                           injury, personal injury, death or damage to
                           property, including loss of use thereof, occurring
                           on or in any way related to the Premises or
                           occasioned by reason of occupancy by and the
                           operations of Tenant upon, in and around the
                           Premises, with limits of $1,000,000 per occurrence
                           for personal injury or death or damage to property,
                           with coverage at least as broad as that provided by
                           INSURANCE SERVICES OFFICE COMMERCIAL GENERAL
                           LIABILITY COVERAGE form CG0001 (Occurrence Form),
                           and such policy or policies shall cover all of
                           Tenant's operations on the entire Premises,
                           including but not limited to any elevators and
                           escalators therein and any sidewalks, streets or
                           other public ways adjoining the Premises; and

                  (2)      automobile liability covering owned, non-owned,
                           leased and hired vehicles with combined single
                           limits of no less than $250,000 per occurrence.

5.2      DEDUCTIBLE

         The deductible for any policy required hereunder shall not exceed
         $1,000.

5.3      MODIFICATION OF REQUIREMENTS

         Authority may adjust or increase liability insurance amounts and
         requirements as Authority deems reasonably necessary, or as may be
         required because of changes in the insurance requirements imposed by
         Authority's insurer or by applicable law. Tenant shall comply with
         such adjustments or increases within such reasonable time period as is
         requested by Authority.

                                     Page 5


<PAGE>   7




5.4      CERTIFICATES

         Upon or prior to the commencement of the term of this Sublease and at
         least annually thereafter Tenant shall furnish to Authority
         certificates of insurance showing the amount and type of the insurance
         then in effect that is required to be procured and maintained by it
         hereunder and stating the date and term of the policies evidencing
         such insurance. Tenant shall, upon request, supply Authority with
         certified copies of all applicable insurance policies, riders,
         endorsements and declaration pages. Certificates evidencing any
         renewal, replacement or extension of any or all of the insurance
         required hereunder, or of renewals, replacements or extensions of such
         renewals, replacements or extensions, shall be delivered by Tenant to
         Authority not less than thirty (30) days prior to the expiration of
         any policy of insurance renewed, replaced or extended by the insurance
         represented by any such certificate. Each policy of insurance required
         hereunder shall provide for not less than thirty (30) days notice to
         Authority and Tenant before such policy may be canceled.

5.5      ADDITIONAL INSURANCE

         The provisions of this Sublease as to insurance required to be
         procured and maintained shall not limit or prohibit, or be construed
         as limiting or prohibiting, Authority or Tenant from obtaining any
         other or greater insurance with respect to the Premises or
         improvements thereon or the use and occupancy thereof that either or
         both of them may wish to carry, but in the event Authority or Tenant,
         as the case may be, shall procure or maintain any such insurance not
         required by this Sublease, the cost thereof shall be at the expense of
         the party procuring or maintaining the same.

5.6      ADDITIONAL INSUREDS

         All insurance required by this Article shall be procured and
         maintained in the name of Tenant and shall add Authority and the City
         of Tucson as additional insureds as their interests appear.

5.7      WAIVER OF SUBROGATION

         Each party hereto waives all claims for recovery from the other party
         for any loss or damage to any of its property on the Premises insured
         under valid and collectible insurance policies to the extent of any
         recovery collected from such policies. The parties agree that all
         material insurance policies shall be endorsed with a clause which
         waives subrogation against the other party.

5.8      INSURANCE BY AUTHORITY

         Authority may, upon written notice to Tenant, in the event that Tenant
         fails to timely provide proof of insurance as required by Section 5.4
         above, procure and maintain any or all of the insurance required of
         Tenant under this Article. In such event, all costs of such insurance
         procured and maintained by Authority on behalf of Tenant shall be the
         responsibility of

                                     Page 6


<PAGE>   8



         Tenant and shall be fully reimbursed to Authority within ten (10)
         business days after Authority advises Tenant of the cost thereof.

5.9      CASUALTY TO PREMISES

         Authority may, but shall not be required to, maintain insurance
         against loss or damage to the Building and the Premises, but shall
         have no obligation to repair the Building or the Premises in the event
         of casualty or damage thereto. In the event that any such casualty
         renders the Premises unsafe or untenantable, this Sublease shall
         terminate immediately.

                               ARTICLE VI - TAXES


6.1      TENANT'S RESPONSIBILITY

         Tenant shall pay before delinquency any and all taxes levied or
         assessed against the Premises, any levied or assessed against or by
         reason of personal property located in, on or about the Premises, any
         levied or assessed because of Tenant's right to possession of the
         Premises and improvements thereon, all applicable taxes levied or
         assessed by any government body as the result of Tenant's operations
         and all taxes which may be levied or assessed as the result of rentals
         payable under this Sublease. All such taxes and assessments for
         partial years shall be apportioned and adjusted on a time basis.

6.2      PROTEST

         Tenant shall have the right at its own cost and expense to contest the
         amount or validity of any such tax or assessment and to bring or
         defend any actions involving the amount or validity of any such tax or
         assessment in its own name or in the name of Authority; provided that,
         if unsuccessful, Tenant shall pay and discharge any such tax or
         assessment so contested, together with any penalties, fines, interest,
         costs and expenses, including reasonable attorneys' fees, that may
         result from any such action by Tenant.

                   ARTICLE VII - RULES, REGULATIONS AND LAWS


7.1      COMPLIANCE WITH ALL APPLICABLE LAWS

         Tenant and all persons operating under the rights granted hereby shall
         observe and obey all reasonable and lawful rules and regulations with
         respect to the use of the Airport which have been or may in the future
         be adopted by Authority and shall further abide by all applicable
         laws, statutes, ordinances, rules, orders, and regulations of all
         governing bodies which are now in effect or which may hereafter be put
         into effect.

7.2      NON-DISCRIMINATION

         A.       NON-DISCRIMINATION COVENANTS

                                     Page 7


<PAGE>   9



                  (1)      The Tenant for himself, his heirs, personal
                           representatives, subtenants, successors in interest,
                           and assigns, as a part of the consideration hereof,
                           does hereby covenant and agree, as a covenant
                           running with the land, that in the event
                           improvements are constructed, maintained, or
                           otherwise operated on the Premises for a purpose for
                           which a Department of Transportation ("DOT") program
                           or activity is extended or for another purpose
                           involving the provision of similar services or
                           benefits, Tenant shall maintain and operate such
                           improvements and services in compliance with all
                           other requirements imposed pursuant to Title 49,
                           Code of Federal Regulations, DOT, Subtitle A, Office
                           of the Secretary, Part 21, Nondiscrimination in
                           Federally-Assisted Programs of the Department of
                           Transportation-Effectuation of Title VI of the Civil
                           Rights Act of 1964, and as said Regulations may be
                           amended.

                  (2)      The Tenant for himself, his personal
                           representatives, successors in interest, and
                           assigns, as a part of the consideration hereof, does
                           hereby covenant and agree, as a covenant running
                           with the land that: (1) no person on the grounds of
                           race, color, or national origin shall be excluded
                           from participation in, denied the benefits of, or be
                           otherwise subjected to discrimination in the use of
                           said improvements, (2) that in the construction of
                           any improvements on, over, or under such land and
                           the furnishing of services thereon, no person on the
                           grounds of race, color, or national origin shall be
                           excluded from participation in, denied the benefits
                           of, or otherwise be subject to discrimination, (3)
                           that Tenant shall use the Premises in compliance
                           with all other requirements imposed by or pursuant
                           to Title 49, Code of Federal Regulations, Department
                           of Transportation, Subtitle A, Office of the
                           Secretary, Part 21, Non-discrimination in
                           Federally-Assisted Programs of the Department of
                           Transportation-Effectuation of Title VI of the Civil
                           Rights Act of 1964, and as said Regulations may be
                           amended.

                  (3)      Tenant shall furnish its accommodations and/or
                           services on a fair, equal and not unjustly
                           discriminatory basis to all users thereof and it
                           shall charge fair, reasonable and not unjustly
                           discriminatory prices for each unit or service,
                           PROVIDED THAT Tenant may be allowed to make
                           reasonable and nondiscriminatory discounts, rebates
                           or other similar type of price reductions to volume
                           purchasers.

                  (4)      Tenant assures that it will undertake an affirmative
                           action program as required by 14 CFR Part 152,
                           Subpart E, to insure that no person shall on the
                           grounds of race, creed, color, national origin, or
                           sex be excluded from participating in any employment
                           activities covered in 14 CFR Part 152, Subpart E.
                           Tenant assures that it will require that its covered
                           sub organizations provide assurances from their sub
                           organizations, as required by 14 CFR Part 152,
                           Subpart E, to the same effort.

         B.       NON-COMPLIANCE

                  Non-compliance with an provision of this Section shall
                  constitute a material breach

                                     Page 8


<PAGE>   10



                  hereof and in the event of such non-compliance Authority
                  shall have the right to terminate this Sublease and the
                  estate hereby created without liability therefore or at the
                  election of Authority or the United States, either or both
                  shall have the right to judicially enforce these provisions.

         C.       SUBLEASES

                  Tenant agrees that it shall insert the provisions of this
                  Section in any sublease by which Authority grants a right or
                  privilege to any person, firm or corporation to render
                  accommodations and/or services to the public on the Premises
                  herein subleased.

7.3      COMPLIANCE WITH FAR PART 77

         Tenant shall comply with the notification and review requirements
         covered in Part 77 of the Federal Aviation Regulations in connection
         with any improvements or modification or alteration of improvements on
         the Premises.

7.4      FAR PART 107; AIRPORT ACCESS

         Tenant and all persons operating under the rights granted hereunder
         shall comply with Part 107 of the Federal Aviation Regulations with
         respect to aircraft operations and airport security at the Airport.
         Tenant shall at all times take all reasonable steps to control, police
         and regulate the use of the Premises and of the Airport premises to
         prevent unauthorized persons and the general public from obtaining
         access to the Airport. Such steps by Tenant shall include, but not be
         limited to, steps requested by Authority and those required under
         Federal Regulations. Tenant must secure the Premises so that there is
         no inadvertent or purposeful unauthorized entry in or upon the Airport
         by people, vehicles, or animals.

7.5      STATE AND FEDERAL AVIATION REGULATIONS

         Tenant will conduct its operations and activities on the Airport so as
         to conform to all applicable regulations of the Federal Aviation
         Administration and the Aeronautics Division of the Arizona Department
         of Transportation.

7.6      EXCLUSIVE RIGHTS PROHIBITED

         It is understood and agreed that nothing herein contained shall be
         construed to grant or authorize the granting of an exclusive right
         within the meaning of Section 49 U.S.C. 40103(e).

7.7      ENVIRONMENTAL LAWS

         Tenant, at its own expense, shall ensure that Tenant and Tenant's
         agents, employees, invitees, and sublessee comply with all present and
         hereafter enacted Environmental Laws, and any amendments thereto,
         affecting Tenant's operation on the Premises.


                                     Page 9


<PAGE>   11



         A.       DEFINITIONS

                  (1)      "Environmental Laws" means any laws, regulations
                           and ordinances (whether enacted by the local, state,
                           federal government, or by the Authority) now in
                           effect or hereafter enacted that deal with the
                           regulation or protection of the environment
                           (including the ambient air, ground water, surface
                           water, and land use, including sub-strata land), or
                           with the generation, storage, disposal or use of
                           chemicals or substances that could be detrimental to
                           human health or the environment.

                  (2)      "Extremely Hazardous Substances" means any substance
                           or material designated by the United States
                           Environmental Protection Agency as an "extremely
                           hazardous substance" under Section 302(a)(2) of the
                           Superfund Amendment and Reauthorization Act ("SARA")
                           (42 U.S.C. Section 11002(a)(2)).

                  (3)      "Hazardous Material" means all substances, materials
                           and wastes that are, or that become, regulated under,
                           or that are classified as hazardous or toxic under
                           any environmental law (including, but not limited to,
                           Extremely Hazardous Substances and Toxic Chemicals).

                  (4)      "Release" means any releasing, spilling, leaking,
                           pumping, pouring, emitting, emptying, discharging,
                           injecting, escaping, leaching, disposing, or dumping.

         B.       COMPLIANCE

                  (1)      Compliance with Environmental Laws Generally. Tenant
                           shall not cause or permit any Hazardous Material to
                           be used, generated, manufactured, produced, stored,
                           brought upon, or released, on, under or about the
                           Premises, or transported to and from the Premises,
                           by Tenant, its agents, employees, contractors,
                           invitees, sublessees or any third party in violation
                           of any Environmental Law, provided that, in no
                           circumstances shall Tenant cause or permit any
                           Extremely Hazardous Substance or Toxic Chemical to
                           be used, generated, manufactured, produced, stored,
                           brought upon, or Released, on, under or about the
                           Premises, or transported to and from the Premises.

                  (2)      Cleanup. Without limiting the foregoing, if the
                           presence of any Hazardous Material on, under or
                           about the Premises caused or permitted by Tenant
                           results in any contamination of the Premises, Tenant
                           shall promptly take all actions at its sole cost and
                           expense as are necessary to return the Premises to
                           the condition existing prior to the introduction of
                           any such Hazardous Material to the Premises;
                           provided that Authority's approval of such actions
                           shall first be obtained, which approval shall not be
                           unreasonably withheld so long as such actions would
                           not potentially have any material adverse effect on
                           the Premises. In the event Tenant shall fail timely
                           to commence or cause to be commenced or fail
                           diligently to prosecute to completion such actions
                           as are necessary to return the Premises to the
                           conditions existing prior to the introduction of any
                           Hazardous Material to the Premises, Authority may,
                           but shall not be obligated to, cause such action to
                           be performed, and all costs and

                                    Page 10


<PAGE>   12



                           expenses (including, without limitation, attorneys'
                           fees) thereof or incurred by Authority in connection
                           therewith shall be paid by Tenant.

                  (3)      Governmental Submittals. Tenant shall, at Tenant's
                           own cost and expense, make all submissions to,
                           provide all information to, and comply with all
                           requirements of any governmental authority having
                           jurisdiction (the "Government") under the
                           Environmental Laws. Should the Government determine
                           that a site characterization, site assessment and/or
                           a cleanup plan be prepared or that a cleanup should
                           be undertaken because of any release of hazardous
                           materials at the Premises which occur during the
                           term of this Sublease, then Tenant shall, at
                           Tenant's own cost and expense, prepare and submit
                           the required plans and financial assurances, and
                           carry out the approved plans in accordance with all
                           requirements of the Government.

                  (4)      Information Sharing. Tenant shall provide to Tucson
                           Airport Authority a copy of any and all information,
                           reports, and applications submitted to the
                           Government as described in Paragraph X.6B.(4),
                           whether such submittal is routine or in response to
                           a release or threatened release of any Hazardous
                           Material, and whether the impetus for such submittal
                           is generated by Tenant, or by an inquiry or action
                           by the Government or another third party. At no cost
                           or expense to Authority, Tenant shall promptly
                           provide all information requested by Authority to
                           determine the applicability of the Environmental
                           Laws to the Premises, or to respond to any
                           governmental investigation or to respond to any
                           claim of liability by third parties which is related
                           to environmental contamination. Tenant shall
                           immediately notify Authority of any correspondence
                           or communication from any governmental entity
                           regarding the application of Environmental Laws to
                           the Premises or Tenant's operation of the Premises.

                  (5)      Change in Use of Premises. Tenant shall immediately
                           notify Authority of any changes in Tenant's
                           operation on the Premises that will change or has
                           the potential to change Tenant's or Authority's
                           obligations or liabilities under the Environmental
                           Laws.

         C.       INDEMNITY

                  Tenant shall indemnity, defend and hold harmless Authority,
                  its successors and assigns, its employees, agents and
                  attorneys from and against any and all liability, loss,
                  damage, expense, penalties and costs (including legal and
                  investigation fees or costs) arising from or related to any
                  claim or action for injury, liability, breach or warranty or
                  representation, or damage to persons or property and any and
                  all claims or actions brought by any party or governmental
                  body, alleging or arising in connection with (i)
                  contamination of, or adverse effects on, the environment
                  (whether known, alleged, potential, or threatened), or (ii)
                  alleged or potential violation of any Environmental Law or
                  other statute, ordinance, rule, regulation, judgment or order
                  of any government or judicial entity which are brought as a
                  result (whether in part or in whole) of any activity or
                  operation on or Release from the Premises (caused by

                                    Page 11


<PAGE>   13



                  any person or entity other than Authority) during the term of
                  this Sublease or any previous sublease of the Premises by
                  Tenant or its owners or related entities. This obligation
                  includes but is not limited to all costs and expenses related
                  to investigation and/or cleaning up the Premises and all
                  land, soil, and underground or surface water as required
                  under the law. Tenant's obligations and liabilities under
                  this paragraph shall continue so long as Authority bears any
                  liability or responsibility under the Environmental Laws for
                  any action that occurred on the Premises during the term of
                  the Sublease. This indemnification of Authority by Tenant
                  includes, without limitation, costs incurred in connection
                  with any investigation of site conditions or any cleanup,
                  remedial, removal or restoration work required by any
                  federal, state, or local governmental agency or political
                  subdivision because of Hazardous Material located on the
                  Premises or present in the soil or ground water on, under or
                  about the Premises. The parties agree that Authority's right
                  to enforce Tenant's Promise to indemnify is not an adequate
                  remedy at law for Tenant's violation of any provision of this
                  paragraph; Authority shall have all the rights and remedies
                  set forth in this Sublease as well as all other rights and
                  remedies provided by law.

         D.       SUBTENANTS

                  Tenant shall insert the provisions of this section in any
                  lease agreement or contract by which it grants a right or
                  privilege to any person, firm or corporation under this
                  Sublease.


                         ARTICLE VIII - SUPERIOR RIGHTS


8.1      AGREEMENTS WITH UNITED STATES

         This Sublease shall be subordinate to the provisions and requirements
         of any existing or future agreement between Authority and the United
         States, relative to the development, operation or maintenance of the
         Airport.

8.2      RIGHTS OF GOVERNMENT DURING WAR OR NATIONAL EMERGENCY

         This Sublease and all the provisions hereof shall be subject to
         whatever right the United States Government now has or in the future
         may have or acquire, affecting the control, operation, regulation and
         taking over of the Airport or the exclusive or non-exclusive use of
         the Airport by the United States during the time of war or national
         emergency.

         Tenant and Authority recognize that during the time of war or national
         emergency the City of Tucson, owner of the Airport, has the right to
         enter into agreements with the United States government for military or
         naval use of part or all of the Airport. If any such agreement is
         executed by the City of Tucson, the provisions of this Sublease,
         insofar as they are inconsistent with the provisions of any agreement
         so made by the City of Tucson with the United States government, shall
         be subject to the terms of such agreement and Tenant shall have no
         claim against Authority or the City of Tucson for any loss or damage
         sustained by

                                    Page 12


<PAGE>   14



         Tenant because of the making of such agreement by the City of Tucson.
         In such event, however, the amounts, if any, payable from the City of
         Tucson or the United States for improvements placed on the Premises by
         Tenant shall be paid to Tenant if this Sublease is in effect at the
         time of such taking.

8.3      RIGHTS OF AUTHORITY

         Authority reserves the right to further develop or improve the landing
         area of the Airport as it sees fit, regardless of the desires or view
         of Tenant and without interference or hindrance.

         Authority reserves the right, but shall not be obligated to Tenant, to
         maintain and keep in repair the landing area of the Airport and all
         publicly-owned facilities of the Airport, together with the right to
         direct and control all activities of Tenant in this regard.

8.4      AGREEMENTS WITH CITY OF TUCSON

         This Sublease is subject to the existing lease between Authority and
         the City of Tucson and to the provisions of any existing or future
         agreement between the City of Tucson and Authority.

8.5      ABATEMENT OF OBLIGATION TO CONSTRUCT OR REBUILD

         Inasmuch as this Sublease contains certain provisions concerning
         repairs, replacement and rebuilding of damaged or destroyed buildings,
         construction of buildings, quiet enjoyment and other related causes
         applicable to the parties to this Sublease, and inasmuch as the
         Premises constitute a portion of a public Airport, it is agreed that
         the parties hereto shall not be required to repair, replace, rebuild
         or construct any building or portion of any building so long as the
         obligated party is prevented from so doing by action of the United
         States government or any agency or department thereof.

                ARTICLE IX - RESERVATION OF NAVIGATION EASEMENT


9.1      EASEMENT

         There is hereby reserved to Authority for the use and benefit of
         aircraft using the Airport a right of flight for the passage of
         aircraft in the airspace above the uppermost surface of the Premises,
         together with the right to cause such noise as may be inherent in the
         operation of any aircraft now known or hereafter used for navigation
         of or flight in said airspace, or landing at, or taking off from, or
         operating on the Airport.

9.2      STRUCTURES; ELEVATION LIMIT

         Tenant, by accepting this Sublease, expressly agrees for itself, its
         successors and assigns that it will not erect nor permit the erection
         of any structure or object, nor permit the growth of any tree on the
         Premises above the mean sea level elevation of 2460 feet. In the event
         the aforesaid covenants are breached, Authority reserves the right to
         enter upon the Premises and

                                    Page 13


<PAGE>   15



         to remove the offending structure or object and cut the offending
         tree, all of which shall be at the expense of Tenant.

9.3      PURPOSES

         Tenant, by accepting this Sublease agrees for itself, its successors
         and assigns that it will not make use of the Premises in any manner
         which might interfere with the landing and taking off of aircraft from
         the Airport or otherwise constitute a hazard. In the event the
         aforesaid covenant is breached, Authority reserves the right to enter
         upon the Premises and cause the abatement of such interference at the
         expense of Tenant.

                      ARTICLE X - ASSIGNMENT AND SUBLEASE

10.1     CONSENT OF AUTHORITY

         Tenant shall not sublease, assign or sell this Sublease or any
         interest therein, or any portion of the Premises, without first
         obtaining written consent from Authority. For this purpose, any change
         in ownership or control of Tenant shall be considered an assignment of
         rights hereunder. Tenant shall furnish the Authority with a copy of
         any sublease or assignment entered into with respect to this Sublease
         or the Premises or any portion thereof.

10.2     CONTINUING RESPONSIBILITY OF TENANT

         If it is a complete assignment or sublease of the entire Premises it
         shall be in writing and provide that the subtenant or assignee assumes
         and agrees to perform all of the terms, covenants and agreements which
         Tenant has agreed to perform under this Sublease, and that Tenant's
         subtenant or assignee shall become jointly and severally liable with
         Tenant, or any successor in interest of Tenant, for the performance of
         the terms and covenants of this Sublease. A sublease for less than the
         entire Premises shall be in writing and shall recite that it is
         subject and subordinate to all the terms and provisions of this
         Sublease. Neither the execution of such sublease or assignment, the
         Authority's consent to the same, nor the acceptance of rent by
         Authority from Tenant's subtenant or assignee shall release or in any
         manner affect Tenant's liability to Authority hereunder.

10.3     SUBJECT TO THIS SUBLEASE

         Any sublease between Tenant and a subtenant shall be in writing and
         shall provide that said sublease is subject to all the provisions of
         this Sublease.

                       ARTICLE XI - DEFAULTS AND REMEDIES

11.1     DEFAULT BY TENANT

         Tenant shall be in default under this Sublease upon the occurrence of
         any of the following "Events of Default":

                                    Page 14


<PAGE>   16



         A.       Tenant shall fail to pay when due any installment of rent
                  payable pursuant to this Sublease and such failure shall
                  continue unremedied for a period of ten (10) days; provided
                  that Tenant shall not be entitled to the benefit of more than
                  one (1) grace period of ten (10) days under this paragraph
                  A(1) within any calendar year.

         B.       Tenant or any of Tenant's agents, employees, guests,
                  invitees, or subtenants, shall use Premises for any unlawful
                  or illegal purpose or for any purpose other than those set
                  forth on Exhibit B.

         C.       Tenant shall fail to observe or perform any other covenant,
                  agreement or obligation hereunder and such failure shall not
                  be remedied within thirty (30) days (or such additional time
                  as is reasonably required in the opinion of Authority to
                  correct any such failure, if Tenant has instituted corrective
                  action and is diligently pursuing the same) after Authority
                  shall have given Tenant written notice specifying which
                  covenant, agreement or obligation Tenant has failed to
                  observe or perform; provided that Tenant shall not be
                  entitled to the benefit of more than two (2) grace periods of
                  thirty (30) days (or more if permitted) under this paragraph
                  within any calendar year.

         D.       There is commenced by or against Tenant any case under the
                  Bankruptcy Code (Title XI of the United States Code) or any
                  other bankruptcy, arrangement, reorganization, receivership,
                  custodianship or similar proceeding under any federal, state
                  or foreign law, and with respect to any such case or
                  proceeding that is involuntary, such case or proceeding is
                  not dismissed with prejudice within sixty (60) days of such
                  filing.

         E.       Tenant makes a general assignment for the benefit of
                  creditors or applies for, consents to, or acquiesces in the
                  appointment of a trustee, receiver, or other custodian for
                  Tenant or the property of Tenant or any part thereof, or in
                  the absence of such application, consent, or acquiescence, a
                  trustee, receiver or other custodian is appointed for Tenant
                  or the property of Tenant or any part thereof, and such
                  appointment is not discharged within sixty (60) days.

         F.       Any action is commenced against Tenant to foreclose any lien
                  or mortgage or other rights of Tenant in or to the Premises.

         G.       Tenant abandons, deserts or vacates the Premises for seven
                  (7) consecutive days or more.

11.2     REMEDIES OF AUTHORITY

         If Tenant shall be in default hereunder as set forth above, the
         Authority may exercise any of the following remedies.

         A.       TERMINATION

                  Authority may, at its election, give Tenant written notice of
                  its intention to terminate this Sublease on a date which
                  shall not be earlier than ten (10) days after such notice

                                    Page 15


<PAGE>   17



                  is given. If all defaults have not been cured on or before
                  the date specified in the notice, Tenant's rights to
                  possession of the Premises shall cease, and with or without
                  re-entry by Authority, this Sublease and the term hereof
                  shall terminate, and Authority may then re-enter and take
                  possession of the Premises as provided below with respect to
                  reentry without termination. Any such termination must be
                  express, and neither notice to pay rent or to deliver up
                  possession of the Premises given pursuant to law, nor any
                  proceeding instituted by Authority, nor the failure by Tenant
                  for any period of time to pay any of the rent herein
                  reserved, shall of itself operate to terminate this Sublease.

                  (1)      Damages. Notwithstanding the termination of this
                           Sublease or any re-entry by Authority upon such
                           termination, Tenant shall continue to be liable for
                           and Authority shall be entitled to recover as
                           damages:

                           (a)      the sum of all rent that is due and owing
                                    as of the date of termination and all other
                                    sums then owing by Tenant hereunder;


                           (b)      all rent that would otherwise continue to
                                    accrue during the remaining term hereof or,
                                    at the election of Authority, the
                                    discounted present value of the sum of all
                                    rentals remaining to be paid for the
                                    remaining term of this Sublease, calculated
                                    by the Authority in its reasonable
                                    discretion; and

                           (c)      the reasonable costs incurred by Authority
                                    in re-letting the Premises and the
                                    reasonable costs to Authority necessary to
                                    place the Premises in condition for
                                    re-letting.

                  (2)      Credit. Any rent, income, receipts, profits or other
                           monies received or derived by Authority from any
                           re-letting or other use of the Premises after the
                           termination of this Sublease shall, so long as
                           Tenant shall continue to be liable for the payment
                           of rent hereunder, be credited against such rent as
                           received and collected.

         B.       REENTRY WITHOUT TERMINATION

                  As an alternative remedy, Authority may, without terminating
                  this Sublease, and after giving Tenant ten (10) days written
                  notice, re-enter the Premises and take possession thereof
                  pursuant to any legal proceedings or notice required by law,
                  in which event Tenant shall remain liable for the payment of
                  all rent and the performance of all conditions contained in
                  this Sublease.

                  (1)      Reentry. Upon any such re-entry of the Premises
                           by Authority, Authority may expel Tenant and those
                           claiming through or under Tenant and remove their
                           property and effects (forcibly, if necessary)
                           without being guilty in any manner of trespass and
                           without any liability therefor and without prejudice
                           to any remedies of Authority in the event of default
                           by Tenant, and without liability for any
                           interruption of the conduct of the affairs of Tenant
                           or those claiming through or under Tenant which may
                           result from such entry. Tenant hereby irrevocably
                           appoints Authority as the agent and attorney-in-fact
                           of Tenant to remove all of Tenant's property
                           whatsoever situated upon the

                                    Page 16


<PAGE>   18



                  Premises and to place such property in storage in any
                  warehouse or other suitable place in Tucson, Arizona, for the
                  account of and at the expense of Tenant and Tenant hereby
                  exempts and agrees to save harmless Authority from any costs,
                  loss or damage whatsoever arising or occasioned by any such
                  removal and storage of such property by Authority or its duly
                  authorized agents in accordance with the provisions herein
                  contained.

         (2)      Reletting. After such re-entry, Authority shall use reasonable
                  diligence to re-let the Premises, or any part or parts
                  thereof, for such period or periods and upon such term or
                  terms and at such reasonable rental or rentals and upon such
                  other conditions as Authority may deem advisable, with the
                  right to make alterations and repairs to the Premises. Tenant
                  hereby irrevocably appoints Authority as the agent and
                  attorney-in-fact of Tenant to enter upon and re-let the
                  Premises and to incur any necessary expenses in doing so, all
                  to be reimbursed by Tenant. Tenant agrees that no acts of
                  Authority in effecting such re-letting shall constitute a
                  termination of this Sublease, irrespective of the period for
                  which such re-letting is made or the terms and conditions of
                  such re-letting or otherwise.

         (3)      Credit. Tenant shall receive a credit against such rental in
                  the amount of the proceeds, if any, of such re-letting.
                  Tenant's obligations, in addition to rent, for which it shall
                  remain liable include, but shall not be limited to, all
                  repossession costs, brokerage commissions, legal expenses,
                  attorneys' fees, expenses of employees, removal costs,
                  alteration costs and expenses of preparation for re-letting,
                  and any other amounts expended pursuant to action taken under
                  this paragraph.

11.3     REMEDIES CUMULATIVE

         All rights, options and remedies of Authority contained in this
         Sublease shall be construed and held to be cumulative, and no one of
         them shall be exclusive of the other, and Authority shall have the
         right to pursue any one or all of such remedies or any other remedy or
         relief which may be provided by law, whether or not stated in this
         Sublease (including but not limited to any right of "self help" or
         similar remedy in order to minimize any damages, expenses, penalties
         and related fees or costs).

11.4     NO WAIVER

         No waiver of any Event of Default of Tenant hereunder shall be implied
         from any acceptance by Authority of any rent or other payments due
         hereunder or any omission by Authority to take any action on account
         of such default if such default persists or is repeated, and no
         express waiver shall affect an Event of Default in a manner other than
         as specified in said waiver. The consent or approval by Authority to
         or of any act by Tenant requiring Authority's consent or approval
         shall not be deemed to waive or render unnecessary Authority's consent
         or approval to or of any subsequent similar acts by Tenant.

                                    Page 17


<PAGE>   19




11.5     NOTICE

         Any default notice tendered to Tenant hereunder shall be deemed to be
         sufficient if it is reasonably calculated to put Tenant on inquiry as
         to the nature and extent of such default.

11.6     INTEREST

         All amounts due the Authority hereunder shall accumulate interest at a
         rate of 12% per annum or the maximum amount allowed by law, whichever
         is less.

                      ARTICLE XII - TERMINATION BY TENANT


12.1     TERMINATION EVENTS

         Tenant may terminate this Sublease at any time upon thirty (30) days
         written notice to Authority upon or after the happening or
         continuation of any of the following events:

                  A.       The inability of Tenant to use, for a period of
                           thirty (30) consecutive days, any portion of the
                           rights, licenses, services or privileges of Tenant
                           hereunder because of any law, rule, regulation or
                           other action or failure to act on the part of any
                           United States governmental authority having
                           jurisdiction thereof.

                  B.       The default by Authority in the performance of any
                           covenant or agreement herein required to be
                           performed by Authority and the failure of Authority
                           to remedy such default for a period of thirty (30)
                           days after receipt of written request or demand from
                           Tenant to remedy the same.

                  C.       The assumption by the United States government or
                           any authorized agency thereof of the operation or
                           control of the Airport or any part thereof, in such
                           manner as to substantially restrict Tenant for a
                           period of at least thirty (30) consecutive days from
                           conducting any of its operation on the Premises.

12.2     CURE

         If any of the foregoing reasons for termination by Tenant cease to
         exist prior to a termination, then the right to terminate for such
         reason shall cease.

12.3     NO WAIVER

         No waiver by Tenant of Authority's default of any of its obligations
         hereunder shall be construed to be or act as a waiver by Tenant of any
         subsequent default by Authority.




                                    Page 18


<PAGE>   20




              ARTICLE XIII - SURRENDER OF POSSESSION, CONDITION OF
                                    PREMISES


13.1     SURRENDER

         Upon the expiration or earlier termination of this Sublease or any
         extensions thereof, all rights herein granted to Tenant shall cease
         and terminate and Tenant shall forthwith surrender the Premises to
         Authority.

13.2     GOOD CONDITION

         The Premises shall be returned to Authority in as good condition as at
         the time of occupancy by Tenant, except as otherwise provided in this
         Sublease, ordinary wear and tear excepted.

13.3     REMOVAL OF PROPERTY

         Tenant, and Tenant's subtenants, may remove any and all personal
         property, including portable buildings, signs, trade fixtures,
         machinery and equipment from the Premises prior to expiration of this
         Sublease; provided, however, that Tenant shall repair any damage
         caused by such removal. Title to any property remaining in the
         Premises after expiration or termination of this Sublease shall vest
         in Authority and Authority shall have the right and option to remove
         the same, restore the Premises and recover from Tenant the costs and
         expenses of doing so.

                          ARTICLE XIV - MISCELLANEOUS


14.1     NOTIFICATION OF CHANGES

         Tenant shall promptly notify Authority of any change in Tenant's name
         or address or a change in ownership.


14.2     SUCCESSORS AND ASSIGNS BOUND

         All the terms, covenants and conditions of this Sublease shall extend
         to and bind the successors and assigns of the respective parties
         hereto.

14.3     ARTICLE HEADINGS

         The article headings contained herein are for convenience and
         reference and are not intended to define or limit the scope of any
         provisions of this Sublease.



                                    Page 19


<PAGE>   21




14.4     SEVERABILITY

         If any term or condition of this Sublease shall be deemed to be
         invalid or unenforceable, all other terms and conditions shall remain
         in full force and effect.

14.5     APPLICABLE LAW

         The terms and conditions of this sublease shall be interpreted in
         accordance with the laws of the State of Arizona.

14.6     CONSTRUCTION OF SUBLEASE

         Authority and Tenant agree that each party and its counsel have
         reviewed and revised this Sublease and that any rule of construction
         to the effect that ambiguities are to be resolved against the drafting
         party shall not apply in the interpretation of this Sublease. No
         remedy or election given by any provisions of this Sublease shall be
         deemed exclusive unless so indicated, but each shall, whenever
         possible, be cumulative with all other remedies in law or equity. Each
         provision hereof shall be deemed both a covenant and a condition and
         shall run with the land for the duration of the leasehold term or any
         extensions thereof. Whenever the content of any provision shall
         require it, the singular number shall be held to include the plural
         number and vice versa. The form of this Sublease contemplates that
         Tenant will be an entity and not one or more natural persons. If
         Tenant is one or more natural persons, then all pronouns referring to
         Tenant shall be deemed to be appropriately changed to fit those
         circumstances.

14.7     COSTS AND ATTORNEYS' FEES

         A.       AUTHORITY'S REVIEW

                  Tenant shall pay the expenses (including reasonable
                  attorneys' fees and the fees of other consultants) incurred
                  by Authority in reviewing any of the documents (including
                  subleases, plans and specifications of any improvements to be
                  constructed by Tenant, and documents created pursuant to
                  Section ) for which Authority's approval is required by the
                  terms hereof.

         B.       ENFORCEMENT OF RIGHTS

                  The non-prevailing party shall promptly pay to the prevailing
                  party, upon demand, all costs and other expenses paid or
                  incurred by the prevailing party (including, without
                  limitation, reasonable attorney's fees) in enforcing or
                  exercising its rights or remedies created by, connected with
                  or provided for in this Sublease, whether or not any action
                  or proceeding is brought (including, without limitation, all
                  such costs, expenses and fees incurred in connection with any
                  bankruptcy, receivership, or other court proceedings [whether
                  at the trial or the appellate level]).



                                    Page 20


<PAGE>   22



14.8     NOTICES

         A.       TO AUTHORITY

                  Notices to Authority in connection with this Sublease shall
                  be sufficiently served if physically delivered or sent by
                  certified mail, postage prepaid, addressed to Authority at
                  the address shown for it above.

         B.       TO TENANT

                  Notices to Tenant in connection with this Sublease shall be
                  sufficiently served if physically delivered or sent by
                  regular mail, postage prepaid, addressed to Tenant at the
                  address shown for it above, provided that notice of utility
                  interference shall be sufficiently served if Authority gives
                  said notice to the current supervisor of Tenant's operations
                  on the Premises.

         C.       TIMING

                  Service of any notice or demand by physical delivery shall be
                  deemed complete upon the date of delivery. Service of any
                  notice or demand by certified mail shall be deemed complete
                  at the expiration of three (3) days after the date of the
                  certified mailing if mailed within the continental United
                  States.

         D.       CHANGE IN ADDRESS

                  Each party may change its address to such other addresses as
                  such party may designate to the other in writing from time to
                  time.

14.9     AUTHORITY TO EXECUTE

         Each party represents and warrants to the other that it has the right
         and authority to enter into this Sublease.

         IN WITNESS WHEREOF the parties have executed this Sublease as of the
         day and year first above written.

                                                TUCSON AIRPORT AUTHORITY, INC.,
                                                an Arizona nonprofit corporation

                                            By:  /s/ Signature Illegible
                                                -------------------------------

                                            Its: CEO
                                                -------------------------------
                                                "AUTHORITY"

                                                COMPLETE CONTROLS, INC.

                                            By:  Micah Chapman
                                                -------------------------------

                                            Its: President
                                                -------------------------------
                                                "TENANT"

                                    Page 21



<PAGE>   1
                                                                 EXHIBIT 10.5.12


                                  850 E. TETON
                               INDUSTRIAL SUBLEASE







               EFFECTIVE DATE:         AUGUST  1, 1999





        PARTIES AND ADDRESSES:



                  "AUTHORITY":         TUCSON AIRPORT AUTHORITY, INC.,
                                           an Arizona nonprofit corporation
                                       7005 S. Plumer Avenue
                                       Tucson, Arizona 85706




                     "TENANT":         AAS- COMPLETE CONTROLS INC.
                                         AN ARIZONA CORPORATION
                                       MICAH CHAPMAN, PRESIDENT AND
                                       JOE CIVILETTO, CHIEF OPERATING OFFICER
                                       850 E. TETON RD. SUITE 8
                                       TUCSON, ARIZONA 85706




                     EXHIBITS:         Exhibits lettered A, B and C are annexed
                                       to this Sublease and incorporated herein
                                       by this reference.




<PAGE>   2




                                    RECITALS

         A.       Authority has leased from the City of Tucson, a municipal
                  corporation, the airport known as Tucson International Airport
                  located in Pima County, State of Arizona (the "Airport").

         B.       Tenant desires to sublease from Authority a portion of the
                  Airport and to have certain rights, licenses, services and
                  privileges in connection with the Airport.

                            COVENANTS AND CONDITIONS


                              ARTICLE I - PREMISES


1.1      PREMISES

         Authority does hereby demise and let unto Tenant, for its exclusive use
         and occupancy, and Tenant does hereby lease from Authority, the
         building located on the Airport at 7001 S. PARK AVE (the "Premises"),
         APPROXIMATELY SEVENTY FIVE THOUSAND SIX HUNDRED (75,600) SQUARE FEET,
         AS SHOWN ON EXHIBIT A, subject to all utility easements and rights of
         way that encumber the Premises and subject to the terms hereof.

1.2      ACCESS

         Tenant is granted the right of reasonable access to the Premises over
         such other portions of the Airport as is necessary to provide
         reasonable access to and from the Premises. Authority reserves the
         right to designate the location of such access and to change its
         location from time to time, as Authority deems reasonably necessary and
         appropriate.

1.3      SECURITY

         Tenant is responsible for securing Tenant's Premises, and neither the
         Authority nor its agents or employees will be responsible for any loss
         of or damage to Tenant's possessions while stored on the Premises.

1.4      PARKING

         Tenant shall be entitled to utilize the parking areas associated with
         the Premises in common with other tenants of adjacent facilities. The
         Authority reserves the right, but shall not be obligated, to assign
         specific parking spaces to tenants.

1.5      ENTRY UPON PREMISES

         Authority may enter upon the Premises subleased exclusively to Tenant
         hereunder at any


                                     Page 1

<PAGE>   3


         reasonable time, for any purpose necessary, incidental to or connected
         with the exercise of its governmental functions, or to inspect the
         Premises for compliance with all applicable laws and rules and
         regulations or to prevent waste, loss or destruction. Authority shall,
         in addition, have the right to enter upon the Premises and perform any
         actions necessary or appropriate in connection with any environmental
         investigation or remediation, including but not limited to the
         trenching, drilling and installation, monitoring, repair, replacement
         and operation of pipes, wells, and related equipment. The rent due
         hereunder shall equitably abate with respect any portion of the
         Premises rendered unusable as a result of the Authority's exercise of
         its rights under this Section.

                                ARTICLE II - TERM


2.1      INITIAL TERM

         The initial term of the Sublease shall be for a period of five (5)
         years beginning on the Effective Date hereof (the "Initial Term")

2.2      EXTENSIONS

         The term hereof shall be deemed to be automatically extended on each of
         the first five anniversaries of the Effective Date hereof, for an
         additional one-year period, unless the Authority, at lease ninety (90)
         days prior to such date, notifies Tenant that the Authority does not
         elect to so extend the term. The intent of this provision is to
         automatically extend the term of this Sublease each year (unless
         otherwise elected by Authority) so that a remaining term of
         approximately 5 years is maintained, for a possible maximum total term
         of (10) years.

                         ARTICLE III - RENT AND DEPOSITS

3.1      BASE RENT

         Tenant covenants and agrees to pay Authority rent from the Effective
         Date of this Sublease in an amount equal to SEVENTEEN THOUSAND THREE
         HUNDRED EIGHTY EIGHT DOLLARS AND NO CENTS ($17,388.00) per month with
         FOUR PERCENT INCREASES ANNUALLY BEGINNING WITH THE START OF YEAR THREE
         as set forth on the rent schedule attached as Exhibit C. Monthly rent
         is due and payable to Authority in advance. Rent payments shall be
         delivered to Authority's Property Manager who is currently Tucson
         Industrial Centers, Inc., located at 850 E. Teton, Suite 1, Tucson, AZ
         85706, or such other person as directed by Authority in writing.

3.2      COMMENCEMENT OF RENTAL OBLIGATION

         The first monthly payment, prorated to reflect the partial month for
         which it is paid, shall be


                                     Page 2


<PAGE>   4


         due on the Effective Date hereof and subsequent installments shall be
         due on the first day of each succeeding calendar month thereafter
         during the term of this Sublease.

3.3      LATE FEES

         If any rent or any other sum due from the Tenant shall not be received
         within FIVE (5) DAYS after such amount shall be due, Tenant shall pay a
         late fee equal to TEN PERCENT (10%) of such overdue amount. Acceptance
         of such late fees shall in no event constitute a waiver of Tenant's
         default with respect to such overdue amount nor prevent Authority from
         exercising any of the other right and remedies granted hereunder.

3.4      SECURITY DEPOSIT

         Simultaneously with the entry into this Sublease by the parties hereto,
         the Tenant shall deposit with Authority, $17,388.00 which shall be
         retained by Authority as security for the Tenant's payment of the Rent
         and performance of all of its other obligations under the provisions of
         this Lease, and shall not be deemed to represent payment of any rent.
         On the occurrence of an Event of Default (as defined in Section 11.1
         hereinbelow), Authority shall be entitled, at its sole discretion, (a)
         to apply any or all of such sum in payment of (i) any Rent due and
         unpaid, (ii) any expense incurred by Authority in curing any such
         default, and/or (iii) any damages incurred by Authority by reason of
         such default (including, by way of example rather than by limitation,
         reasonable attorney's fees), in which event the Tenant shall,
         immediately on its receipt of a written demand there for from
         Authority, pay to Authority a sum equaling the amount so applied, so as
         to restore the security deposit to its original amount; and /or (b) at
         Authority's election, to retain any or all of such sum not otherwise
         applied pursuant to the provisions of clause (a) of this sentence in
         liquidation of any or all damages suffered by Authority by reason of
         such default. On the termination of this Sublease, any of such sum
         which is not so applied or retained shall be returned to Tenant. Such
         sum shall not bear interest while being held by Authority.

                          ARTICLE IV - USE OF PREMISES


4.1      PURPOSES

         The Premises shall not, without prior written consent of Authority, be
         used for any purpose other than or in addition to that set forth on
         Exhibit B attached hereto.

4.2      INDEMNITY

         Tenant agrees to fully indemnify and save and hold harmless Authority
         and the City of Tucson from and against all claims, fines, damages,
         penalties, actions and all expenses, including reasonable attorneys'
         fees incidental to the investigation and defense thereof, related to or
         arising out of the fault or negligence of or violation of law by
         Tenant, its agents,


                                     Page 3

<PAGE>   5


         employees or subtenants in the use, occupancy, or maintenance of the
         Premises by any of them.

4.3      DANGEROUS CONDITIONS

         Tenant agrees to exercise reasonable care when using the Premises and
         all improvements thereon to discover and promptly remedy any conditions
         that may pose an unreasonable risk of harm to members of the general
         public or that may constitute a violation of law. If an unsafe,
         defective or dangerous condition, or violation of the law is
         discovered, Tenant warrants that no one other than Tenant and Authority
         employees, agents and representatives will be admitted to the Premises
         and no property belonging to any party other than Tenant and Authority
         will be transported to, collected at or stored upon the Premises until
         the unsafe, defective or dangerous condition, or violation of law is
         corrected.

4.4      ALTERATIONS

         The Authority will complete the electrical service entrance upgrade at
         the southwest corner of the building (cost to be determined but not to
         exceed $17,388). Tenant shall not construct or substantially alter or
         modify any buildings, structures, or other improvements on the Premises
         without the Authority's prior written approval of its plans and
         specifications, which approval may not be unreasonably withheld.

4.5      UTILITIES

         A.       Tenant's Responsibilities:

                  Tenant shall pay for all utility services supplied to it or
                  its subtenants on the Airport.

         B.       Authority's Rights and Responsibilities:

                  Notwithstanding the execution of this Sublease, Authority
                  retains the right to the continued use of such utility lines
                  and services as are presently on the Premises and the right to
                  repair the same when necessary. Authority shall conduct such
                  repairs in such manner and at such times as to not
                  unreasonably interfere with Tenant's operations.

4.6      MAINTENANCE AND REPAIR


         A.       Tenant:

                  (1)      Tenant shall, at no expense to Authority, maintain
                           the Premises in a neat, clean, safe condition and in
                           a manner that is compatible with the adjacent


                                     Page 4
<PAGE>   6



                            facilities, and in compliance with all applicable
                            laws, rules, regulations and orders. Tenant shall be
                            responsible for all minor repairs and maintenance.

                  (2)      General combustible storage shall not exceed 12 feet
                           in height.

                  (3)      Aisle separation shall be between 4 feet to 8 feet
                           wide. (Width to be determined by Fire Department and
                           classification of commodities being stored).

                  (4)      Must have stable storage piles (No leaning stacks).

         B.       Authority:

                  Subject to Section 5.9 the Authority shall be responsible for
                  all structural repairs in the Premises unless necessitated by
                  any negligence or willful misconduct of Tenant or Tenant's
                  subtenants, employees, agents, invitees or guests.

                       ARTICLE V - INSURANCE AND CASUALTY


5.1      INSURANCE REQUIRED

         Tenant shall obtain and maintain in full force, with a company or
         companies authorized to transact the business of insurance in the State
         of Arizona and of sound and adequate financial responsibility, selected
         by Tenant and acceptable to Authority, comprehensive insurance policy
         (either as part of any other policy or policies carried by Tenant, or
         separately) providing for the protection of the Authority and the City
         of Tucson and officers, directors, agents and employees of either of
         them, against:

                  (1)      general liability, including all direct or contingent
                           loss or liability for damages for bodily injury,
                           personal injury, death or damage to property,
                           including loss of use thereof, occurring on or in any
                           way related to the Premises or occasioned by reason
                           of occupancy by and the operations of Tenant upon, in
                           and around the Premises, with limits of $1,000,000
                           per occurrence for personal injury or death or damage
                           to property, with coverage at least as broad as that
                           provided by INSURANCE SERVICES OFFICE COMMERCIAL
                           GENERAL LIABILITY COVERAGE form CG0001 (Occurrence
                           Form), and such policy or policies shall cover all of
                           Tenant's operations on the entire Premises, including
                           but not limited to any elevators and escalators
                           therein and any sidewalks, streets or other public
                           ways adjoining the Premises; and

                  (2)      automobile liability covering owned, non-owned,
                           leased and hired vehicles with combined single limits
                           of no less than $250,000 per occurrence.


                                     Page 5


<PAGE>   7




5.2      DEDUCTIBLE

         The deductible for any policy required hereunder shall not exceed
         $1,000.

5.3      MODIFICATION OF REQUIREMENTS

         Authority may adjust or increase liability insurance amounts and
         requirements as Authority deems reasonably necessary, or as may be
         required because of changes in the insurance requirements imposed by
         Authority's insurer or by applicable law. Tenant shall comply with such
         adjustments or increases within such reasonable time period as is
         requested by Authority.

5.4      CERTIFICATES

         Upon or prior to the commencement of the term of this Sublease and at
         least annually thereafter Tenant shall furnish to Authority
         certificates of insurance showing the amount and type of the insurance
         then in effect that is required to be procured and maintained by it
         hereunder and stating the date and term of the policies evidencing such
         insurance. Tenant shall, upon request, supply Authority with certified
         copies of all applicable insurance policies, riders, endorsements and
         declaration pages. Certificates evidencing any renewal, replacement or
         extension of any or all of the insurance required hereunder, or of
         renewals, replacements or extensions of such renewals, replacements or
         extensions, shall be delivered by Tenant to Authority not less than
         thirty (30) days prior to the expiration of any policy of insurance
         renewed, replaced or extended by the insurance represented by any such
         certificate. Each policy of insurance required hereunder shall provide
         for not less than thirty (30) days notice to Authority and Tenant
         before such policy may be canceled.

5.5      ADDITIONAL INSURANCE

         The provisions of this Sublease as to insurance required to be procured
         and maintained shall not limit or prohibit, or be construed as limiting
         or prohibiting, Authority or Tenant from obtaining any other or greater
         insurance with respect to the Premises or improvements thereon or the
         use and occupancy thereof that either or both of them may wish to
         carry, but in the event Authority or Tenant, as the case may be, shall
         procure or maintain any such insurance not required by this Sublease,
         the cost thereof shall be at the expense of the party procuring or
         maintaining the same.

5.6      ADDITIONAL INSUREDS

         All insurance required by this Article shall be procured and maintained
         in the name of Tenant and shall add Authority and the City of Tucson as
         additional insureds as their interests appear.


                                     Page 6

<PAGE>   8




5.7      WAIVER OF SUBROGATION

         Each party hereto waives all claims for recovery from the other party
         for any loss or damage to any of its property on the Premises insured
         under valid and collectible insurance policies to the extent of any
         recovery collected from such policies. The parties agree that all
         material insurance policies shall be endorsed with a clause which
         waives subrogation against the other party.

5.8      INSURANCE BY AUTHORITY

         Authority may, upon written notice to Tenant, in the event that Tenant
         fails to timely provide proof of insurance as required by Section 5.4
         above, procure and maintain any or all of the insurance required of
         Tenant under this Article. In such event, all costs of such insurance
         procured and maintained by Authority on behalf of Tenant shall be the
         responsibility of Tenant and shall be fully reimbursed to Authority
         within ten (10) business days after Authority advises Tenant of the
         cost thereof.

5.9      CASUALTY TO PREMISES

         Authority may, but shall not be required to, maintain insurance against
         loss or damage to the Premises, but shall have no obligation to repair
         the Premises in the event of casualty or damage thereto. In the event
         that any such casualty renders the Premises unsafe or untenantable,
         this Sublease shall terminate unless Authority notifies Tenant, within
         45 days of the date of the casualty, that Authority intends to repair
         the Premises, in which event this Sublease shall remain in full force
         and effect, although rent shall abate while the Premises are unusable.

                               ARTICLE VI - TAXES

6.1      TENANT'S RESPONSIBILITY

         Tenant shall pay before delinquency any and all taxes levied or
         assessed against the Premises, any levied or assessed against or by
         reason of personal property located in, on or about the Premises, any
         levied or assessed because of Tenant's right to possession of the
         Premises and improvements thereon, all applicable taxes levied or
         assessed by any government body as the result of Tenant's operations
         and all taxes which may be levied or assessed as the result of rentals
         payable under this Sublease. All such taxes and assessments for partial
         years shall be apportioned and adjusted on a time basis.



                                     Page 7


<PAGE>   9

6.2      PROTEST

         Tenant shall have the right at its own cost and expense to contest the
         amount or validity of any such tax or assessment and to bring or defend
         any actions involving the amount or validity of any such tax or
         assessment in its own name or in the name of Authority; provided that,
         if unsuccessful, Tenant shall pay and discharge any such tax or
         assessment so contested, together with any penalties, fines, interest,
         costs and expenses, including reasonable attorneys' fees, that may
         result from any such action by Tenant.

                    ARTICLE VII - RULES, REGULATIONS AND LAWS

7.1      COMPLIANCE WITH ALL APPLICABLE LAWS

         Tenant and all persons operating under the rights granted hereby shall
         observe and obey all reasonable and lawful rules and regulations with
         respect to the use of the Airport which have been or may in the future
         be adopted by Authority and shall further abide by all applicable laws,
         statutes, ordinances, rules, orders, and regulations of all governing
         bodies which are now in effect or which may hereafter be put into
         effect.

7.2      NON-DISCRIMINATION

         A.       NON-DISCRIMINATION COVENANTS

                  (1)      The Tenant for himself, his heirs, personal
                           representatives, subtenants, successors in interest,
                           and assigns, as a part of the consideration hereof,
                           does hereby covenant and agree, as a covenant running
                           with the land, that in the event improvements are
                           constructed, maintained, or otherwise operated on the
                           Premises for a purpose for which a Department of
                           Transportation ("DOT") program or activity is
                           extended or for another purpose involving the
                           provision of similar services or benefits, Tenant
                           shall maintain and operate such improvements and
                           services in compliance with all other requirements
                           imposed pursuant to Title 49, Code of Federal
                           Regulations, DOT, Subtitle A, Office of the
                           Secretary, Part 21, Nondiscrimination in
                           Federally-Assisted Programs of the Department of
                           Transportation-Effectuation of Title VI of the Civil
                           Rights Act of 1964, and as said Regulations may be
                           amended.

                  (2)      The Tenant for himself, his personal representatives,
                           successors in interest, and assigns, as a part of the
                           consideration hereof, does hereby covenant and agree,
                           as a covenant running with the land that: (1) no
                           person on the grounds of race, color, or national
                           origin shall be excluded from participation in,
                           denied the benefits of, or be otherwise subjected to
                           discrimination in the use of said improvements, (2)
                           that in the construction of any improvements on,
                           over, or under such land and the furnishing of
                           services thereon, no person on the grounds of race,
                           color, or national origin shall be excluded from
                           participation in, denied the benefits of, or
                           otherwise be subject to


                                     Page 8

<PAGE>   10



                           discrimination, (3) that Tenant shall use the
                           Premises in compliance with all other requirements
                           imposed by or pursuant to Title 49, Code of Federal
                           Regulations, Department of Transportation, Subtitle
                           A, Office of the Secretary, Part 21,
                           Non-discrimination in Federally-Assisted Programs of
                           the Department of Transportation-Effectuation of
                           Title VI of the Civil Rights Act of 1964, and as said
                           Regulations may be amended.

                  (3)      Tenant shall furnish its accommodations and/or
                           services on a fair, equal and not unjustly
                           discriminatory basis to all users thereof and it
                           shall charge fair, reasonable and not unjustly
                           discriminatory prices for each unit or service,
                           PROVIDED THAT Tenant may be allowed to make
                           reasonable and nondiscriminatory discounts, rebates
                           or other similar type of price reductions to volume
                           purchasers.

                  (4)      Tenant assures that it will undertake an affirmative
                           action program as required by 14 CFR Part 152,
                           Subpart E, to insure that no person shall on the
                           grounds of race, creed, color, national origin, or
                           sex be excluded from participating in any employment
                           activities covered in 14 CFR Part 152, Subpart E.
                           Tenant assures that it will require that its covered
                           sub organizations provide assurances from their sub
                           organizations, as required by 14 CFR Part 152,
                           Subpart E, to the same effort.

         B.       NON-COMPLIANCE

                  Non-compliance with an provision of this Section shall
                  constitute a material breach hereof and in the event of such
                  non-compliance Authority shall have the right to terminate
                  this Sublease and the estate hereby created without liability
                  therefore or at the election of Authority or the United
                  States, either or both shall have the right to judicially
                  enforce these provisions.

         C.       SUBLEASES

                  Tenant agrees that it shall insert the provisions of this
                  Section in any sublease by which Authority grants a right or
                  privilege to any person, firm or corporation to render
                  accommodations and/or services to the public on the Premises
                  herein subleased.

7.3      COMPLIANCE WITH FAR PART 77

         Tenant shall comply with the notification and review requirements
         covered in Part 77 of the Federal Aviation Regulations in connection
         with any improvements or modification or alteration of improvements on
         the Premises.

7.4      FAR PART 107; AIRPORT ACCESS

         Tenant and all persons operating under the rights granted hereunder
         shall comply with Part 107 of the Federal Aviation Regulations with
         respect to aircraft operations and airport

                                     Page 9


<PAGE>   11



         security at the Airport. Tenant shall at all times take all reasonable
         steps to control, police and regulate the use of the Premises and of
         the Airport premises to prevent unauthorized persons and the general
         public from obtaining access to the Airport. Such steps by Tenant shall
         include, but not be limited to, steps requested by Authority and those
         required under Federal Regulations. Tenant must secure the Premises so
         that there is no inadvertent or purposeful unauthorized entry in or
         upon the Airport by people, vehicles, or animals.

7.5      STATE AND FEDERAL AVIATION REGULATIONS

         Tenant will conduct its operations and activities on the Airport so as
         to conform to all applicable regulations of the Federal Aviation
         Administration and the Aeronautics Division of the Arizona Department
         of Transportation.

7.6      EXCLUSIVE RIGHTS PROHIBITED

         It is understood and agreed that nothing herein contained shall be
         construed to grant or authorize the granting of an exclusive right
         within the meaning of Section 49 U.S.C. 40103(e).

7.7      ENVIRONMENTAL LAWS

         Tenant, at its own expense, shall ensure that Tenant and Tenant's
         agents, employees, invitees, and sublessee comply with all present and
         hereafter enacted Environmental Laws, and any amendments thereto,
         affecting Tenant's operation on the Premises.

         A.       DEFINITIONS

                  (1)      "Environmental Laws" means any laws, regulations and
                           ordinances (whether enacted by the local, state,
                           federal government, or by the Authority) now in
                           effect or hereafter enacted that deal with the
                           regulation or protection of the environment
                           (including the ambient air, ground water, surface
                           water, and land use, including sub-strata land), or
                           with the generation, storage, disposal or use of
                           chemicals or substances that could be detrimental to
                           human health or the environment.

                  (2)      "Extremely Hazardous Substances" means any substance
                           or material designated by the United States
                           Environmental Protection Agency as an "extremely
                           hazardous substance" under Section 302(a)(2) of the
                           Superfund Amendment and Reauthorization Act ("SARA")
                           (42 U.S.C. Section 11002(a)(2)).

                  (3)      "Hazardous Material" means all substances, materials
                           and wastes that are, or that become, regulated under,
                           or that are classified as hazardous or toxic under
                           any environmental law (including, but not limited to,
                           Extremely Hazardous Substances and Toxic Chemicals).

                  (4)      "Release" means any releasing, spilling, leaking,
                           pumping, pouring, emitting,


                                     Page 10

<PAGE>   12



                           emptying, discharging, injecting, escaping, leaching,
                           disposing, or dumping.

         B.       COMPLIANCE

                  (1)      Compliance with Environmental Laws Generally. Tenant
                           shall not cause or permit any Hazardous Material to
                           be used, generated, manufactured, produced, stored,
                           brought upon, or released, on, under or about the
                           Premises, or transported to and from the Premises, by
                           Tenant, its agents, employees, contractors, invitees,
                           sublessees or any third party in violation of any
                           Environmental Law, provided that, in no circumstances
                           shall Tenant cause or permit any Extremely Hazardous
                           Substance or Toxic Chemical to be used, generated,
                           manufactured, produced, stored, brought upon, or
                           Released, on, under or about the Premises, or
                           transported to and from the Premises.

                  (2)      Cleanup. Without limiting the foregoing, if the
                           presence of any Hazardous Material on, under or about
                           the Premises caused or permitted by Tenant results in
                           any contamination of the Premises, Tenant shall
                           promptly take all actions at its sole cost and
                           expense as are necessary to return the Premises to
                           the condition existing prior to the introduction of
                           any such Hazardous Material to the Premises; provided
                           that Authority's approval of such actions shall first
                           be obtained, which approval shall not be unreasonably
                           withheld so long as such actions would not
                           potentially have any material adverse effect on the
                           Premises. In the event Tenant shall fail timely to
                           commence or cause to be commenced or fail diligently
                           to prosecute to completion such actions as are
                           necessary to return the Premises to the conditions
                           existing prior to the introduction of any Hazardous
                           Material to the Premises, Authority may, but shall
                           not be obligated to, cause such action to be
                           performed, and all costs and expenses (including,
                           without limitation, attorneys' fees) thereof or
                           incurred by Authority in connection therewith shall
                           be paid by Tenant.

                  (3)      Governmental Submittals. Tenant shall, at Tenant's
                           own cost and expense, make all submissions to,
                           provide all information to, and comply with all
                           requirements of any governmental authority having
                           jurisdiction (the "Government") under the
                           Environmental Laws. Should the Government determine
                           that a site characterization, site assessment and/or
                           a cleanup plan be prepared or that a cleanup should
                           be undertaken because of any release of hazardous
                           materials at the Premises which occur during the term
                           of this Sublease, then Tenant shall, at Tenant's own
                           cost and expense, prepare and submit the required
                           plans and financial assurances, and carry out the
                           approved plans in accordance with all requirements of
                           the Government.

                  (4)      Information Sharing. Tenant shall provide to Tucson
                           Airport Authority a copy of any and all information,
                           reports, and applications submitted to the Government
                           as described in Paragraph X.6B.(4), whether such
                           submittal is routine or in response to a release or
                           threatened release of any Hazardous


                                     Page 11

<PAGE>   13



                           Material, and whether the impetus for such submittal
                           is generated by Tenant, or by an inquiry or action by
                           the Government or another third party. At no cost or
                           expense to Authority, Tenant shall promptly provide
                           all information requested by Authority to determine
                           the applicability of the Environmental Laws to the
                           Premises, or to respond to any governmental
                           investigation or to respond to any claim of liability
                           by third parties which is related to environmental
                           contamination. Tenant shall immediately notify
                           Authority of any correspondence or communication from
                           any governmental entity regarding the application of
                           Environmental Laws to the Premises or Tenant's
                           operation of the Premises.

                  (5)      Change in Use of Premises. Tenant shall immediately
                           notify Authority of any changes in Tenant's operation
                           on the Premises that will change or has the potential
                           to change Tenant's or Authority's obligations or
                           liabilities under the Environmental Laws.

         C.       INDEMNITY

                  Tenant shall indemnity, defend and hold harmless Authority,
                  its successors and assigns, its employees, agents and
                  attorneys from and against any and all liability, loss,
                  damage, expense, penalties and costs (including legal and
                  investigation fees or costs) arising from or related to any
                  claim or action for injury, liability, breach or warranty or
                  representation, or damage to persons or property and any and
                  all claims or actions brought by any party or governmental
                  body, alleging or arising in connection with (i) contamination
                  of, or adverse effects on, the environment (whether known,
                  alleged, potential, or threatened), or (ii) alleged or
                  potential violation of any Environmental Law or other statute,
                  ordinance, rule, regulation, judgment or order of any
                  government or judicial entity which are brought as a result
                  (whether in part or in whole) of any activity or operation on
                  or Release from the Premises (caused by any person or entity
                  other than Authority) during the term of this Sublease or any
                  previous sublease of the Premises by Tenant or its owners or
                  related entities. This obligation includes but is not limited
                  to all costs and expenses related to investigation and/or
                  cleaning up the Premises and all land, soil, and underground
                  or surface water as required under the law. Tenant's
                  obligations and liabilities under this paragraph shall
                  continue so long as Authority bears any liability or
                  responsibility under the Environmental Laws for any action
                  that occurred on the Premises during the term of the Sublease.
                  This indemnification of Authority by Tenant includes, without
                  limitation, costs incurred in connection with any
                  investigation of site conditions or any cleanup, remedial,
                  removal or restoration work required by any federal, state, or
                  local governmental agency or political subdivision because of
                  Hazardous Material located on the Premises or present in the
                  soil or ground water on, under or about the Premises. The
                  parties agree that Authority's right to enforce Tenant's
                  Promise to indemnify is not an adequate remedy at law for
                  Tenant's violation of any provision of this paragraph;
                  Authority shall have all the rights and remedies set forth in
                  this

                                     Page 12


<PAGE>   14


                  Sublease as well as all other rights and remedies provided by
                  law.

         D.       SUBTENANTS

                  Tenant shall insert the provisions of this section in any
                  lease agreement or contract by which it grants a right or
                  privilege to any person, firm or corporation under this
                  Sublease.

                         ARTICLE VIII - SUPERIOR RIGHTS

8.1      AGREEMENTS WITH UNITED STATES

         This Sublease shall be subordinate to the provisions and requirements
         of any existing or future agreement between Authority and the United
         States, relative to the development, operation or maintenance of the
         Airport.

8.2      RIGHTS OF GOVERNMENT DURING WAR OR NATIONAL EMERGENCY

         This Sublease and all the provisions hereof shall be subject to
         whatever right the United States Government now has or in the future
         may have or acquire, affecting the control, operation, regulation and
         taking over of the Airport or the exclusive or non-exclusive use of the
         Airport by the United States during the time of war or national
         emergency.

         Tenant and Authority recognize that during the time of war or national
         emergency the City of Tucson, owner of the Airport, has the right to
         enter into agreements with the United States government for military or
         naval use of part or all of the Airport. If any such agreement is
         executed by the City of Tucson, the provisions of this Sublease,
         insofar as they are inconsistent with the provisions of any agreement
         so made by the City of Tucson with the United States government, shall
         be subject to the terms of such agreement and Tenant shall have no
         claim against Authority or the City of Tucson for any loss or damage
         sustained by Tenant because of the making of such agreement by the City
         of Tucson. In such event, however, the amounts, if any, payable from
         the City of Tucson or the United States for improvements placed on the
         Premises by Tenant shall be paid to Tenant if this Sublease is in
         effect at the time of such taking.

8.3      RIGHTS OF AUTHORITY

         Authority reserves the right to further develop or improve the landing
         area of the Airport as it sees fit, regardless of the desires or view
         of Tenant and without interference or hindrance. Authority reserves the
         right, but shall not be obligated to Tenant, to maintain and keep in
         repair the landing area of the Airport and all publicly-owned
         facilities of the Airport, together with the right to direct and
         control all activities of Tenant in this regard.




                                     Page 13

<PAGE>   15

8.4      AGREEMENTS WITH CITY OF TUCSON

         This Sublease is subject to the existing lease between Authority and
         the City of Tucson and to the provisions of any existing or future
         agreement between the City of Tucson and Authority.

8.5      ABATEMENT OF OBLIGATION TO CONSTRUCT OR REBUILD

         Inasmuch as this Sublease contains certain provisions concerning
         repairs, replacement and rebuilding of damaged or destroyed buildings,
         construction of buildings, quiet enjoyment and other related causes
         applicable to the parties to this Sublease, and inasmuch as the
         Premises constitute a portion of a public Airport, it is agreed that
         the parties hereto shall not be required to repair, replace, rebuild or
         construct any building or portion of any building so long as the
         obligated party is prevented from so doing by action of the United
         States government or any agency or department thereof.

                 ARTICLE IX - RESERVATION OF NAVIGATION EASEMENT

9.1      EASEMENT

         There is hereby reserved to Authority for the use and benefit of
         aircraft using the Airport a right of flight for the passage of
         aircraft in the airspace above the uppermost surface of the Premises,
         together with the right to cause such noise as may be inherent in the
         operation of any aircraft now known or hereafter used for navigation of
         or flight in said airspace, or landing at, or taking off from, or
         operating on the Airport.

9.2      STRUCTURES; ELEVATION LIMIT

         Tenant, by accepting this Sublease, expressly agrees for itself, its
         successors and assigns that it will not erect nor permit the erection
         of any structure or object, nor permit the growth of any tree on the
         Premises above the mean sea level elevation of 2460 feet. In the event
         the aforesaid covenants are breached, Authority reserves the right to
         enter upon the Premises and to remove the offending structure or object
         and cut the offending tree, all of which shall be at the expense of
         Tenant.

9.3      PURPOSES

         Tenant, by accepting this Sublease agrees for itself, its successors
         and assigns that it will not make use of the Premises in any manner
         which might interfere with the landing and taking off of aircraft from
         the Airport or otherwise constitute a hazard. In the event the
         aforesaid covenant is breached, Authority reserves the right to enter
         upon the Premises and cause the abatement of such interference at the
         expense of Tenant.



                                     Page 14


<PAGE>   16


                       ARTICLE X - ASSIGNMENT AND SUBLEASE

10.1     CONSENT OF AUTHORITY

         Tenant shall not sublease, assign or sell this Sublease or any interest
         therein, or any portion of the Premises, without first obtaining
         written consent from Authority. For this purpose, any change in
         ownership or control of Tenant shall be considered an assignment of
         rights hereunder. Tenant shall furnish the Authority with a copy of any
         sublease or assignment entered into with respect to this Sublease or
         the Premises or any portion thereof.

10.2     CONTINUING RESPONSIBILITY OF TENANT

         If it is a complete assignment or sublease of the entire Premises it
         shall be in writing and provide that the subtenant or assignee assumes
         and agrees to perform all of the terms, covenants and agreements which
         Tenant has agreed to perform under this Sublease, and that Tenant's
         subtenant or assignee shall become jointly and severally liable with
         Tenant, or any successor in interest of Tenant, for the performance of
         the terms and covenants of this Sublease. A sublease for less than the
         entire Premises shall be in writing and shall recite that it is subject
         and subordinate to all the terms and provisions of this Sublease.
         Neither the execution of such sublease or assignment, the Authority's
         consent to the same, nor the acceptance of rent by Authority from
         Tenant's subtenant or assignee shall release or in any manner affect
         Tenant's liability to Authority hereunder.

10.3     SUBJECT TO THIS SUBLEASE

         Any sublease between Tenant and a subtenant shall be in writing and
         shall provide that said sublease is subject to all the provisions of
         this Sublease.

                       ARTICLE XI - DEFAULTS AND REMEDIES

11.1     DEFAULT BY TENANT

         Tenant shall be in default under this Sublease upon the occurrence of
         any of the following "Events of Default":

         A.       Tenant shall fail to pay when due any installment of rent
                  payable pursuant to this Sublease and such failure shall
                  continue unremedied for a period of ten (10) days; provided
                  that Tenant shall not be entitled to the benefit of more than
                  one (1) grace period of ten (10) days under this paragraph
                  A(1) within any calendar year.

         B.       Tenant or any of Tenant's agents, employees, guests, invitees,
                  or subtenants, shall use Premises for any unlawful or illegal
                  purpose or for any purpose other than those set forth on
                  Exhibit B.

         C.       Tenant shall fail to observe or perform any other covenant,
                  agreement or

                                     Page 15


<PAGE>   17



                  obligation hereunder and such failure shall not be remedied
                  within thirty (30) days (or such additional time as is
                  reasonably required in the opinion of Authority to correct any
                  such failure, if Tenant has instituted corrective action and
                  is diligently pursuing the same) after Authority shall have
                  given Tenant written notice specifying which covenant,
                  agreement or obligation Tenant has failed to observe or
                  perform; provided that Tenant shall not be entitled to the
                  benefit of more than two (2) grace periods of thirty (30) days
                  (or more if permitted) under this paragraph within any
                  calendar year.

         D.       There is commenced by or against Tenant any case under the
                  Bankruptcy Code (Title XI of the United States Code) or any
                  other bankruptcy, arrangement, reorganization, receivership,
                  custodianship or similar proceeding under any federal, state
                  or foreign law, and with respect to any such case or
                  proceeding that is involuntary, such case or proceeding is not
                  dismissed with prejudice within sixty (60) days of such
                  filing.

         E.       Tenant makes a general assignment for the benefit of creditors
                  or applies for, consents to, or acquiesces in the appointment
                  of a trustee, receiver, or other custodian for Tenant or the
                  property of Tenant or any part thereof, or in the absence of
                  such application, consent, or acquiescence, a trustee,
                  receiver or other custodian is appointed for Tenant or the
                  property of Tenant or any part thereof, and such appointment
                  is not discharged within sixty (60) days

         F.       Any action is commenced against Tenant to foreclose any lien
                  or mortgage or other rights of Tenant in or to the Premises.

         G.       Tenant abandons, deserts or vacates the Premises for seven (7)
                  consecutive days or more.

11.2     REMEDIES OF AUTHORITY

         If Tenant shall be in default hereunder as set forth above, the
         Authority may exercise any of the following remedies.

         A.       TERMINATION

                  Authority may, at its election, give Tenant written notice of
                  its intention to terminate this Sublease on a date which shall
                  not be earlier than ten (10) days after such notice is given.
                  If all defaults have not been cured on or before the date
                  specified in the notice, Tenant's rights to possession of the
                  Premises shall cease, and with or without re-entry by
                  Authority, this Sublease and the term hereof shall terminate,
                  and Authority may then re-enter and take possession of the
                  Premises as provided below with respect to reentry without
                  termination. Any such termination must be express, and neither
                  notice to pay rent or to deliver up possession of the Premises
                  given pursuant to law, nor any proceeding instituted by
                  Authority, nor the failure by Tenant for any period of time to
                  pay any of the rent herein reserved, shall of itself operate


                                     Page 16


<PAGE>   18



                  to terminate this Sublease.

                  (1)      Damages. Notwithstanding the termination of this
                           Sublease or any re-entry by Authority upon such
                           termination, Tenant shall continue to be liable for
                           and Authority shall be entitled to recover as
                           damages:

                           (a)      the sum of all rent that is due and owing as
                                    of the date of termination and all other
                                    sums then owing by Tenant hereunder;

                           (b)      all rent that would otherwise continue to
                                    accrue during the remaining term hereof or,
                                    at the election of Authority, the discounted
                                    present value of the sum of all rentals
                                    remaining to be paid for the remaining term
                                    of this Sublease, calculated by the
                                    Authority in its reasonable discretion; and

                           (c)      the reasonable costs incurred by Authority
                                    in re-letting the Premises and the
                                    reasonable costs to Authority necessary to
                                    place the Premises in condition for
                                    re-letting.

                  (2)      Credit. Any rent, income, receipts, profits or other
                           monies received or derived by Authority from any
                           re-letting or other use of the Premises after the
                           termination of this Sublease shall, so long as Tenant
                           shall continue to be liable for the payment of rent
                           hereunder, be credited against such rent as received
                           and collected.

         B.       REENTRY WITHOUT TERMINATION

                  As an alternative remedy, Authority may, without terminating
                  this Sublease, and after giving Tenant ten (10) days written
                  notice, re-enter the Premises and take possession thereof
                  pursuant to any legal proceedings or notice required by law,
                  in which event Tenant shall remain liable for the payment of
                  all rent and the performance of all conditions contained in
                  this Sublease.

                  (1)      Reentry. Upon any such re-entry of the Premises
                           by Authority, Authority may expel Tenant and those
                           claiming through or under Tenant and remove their
                           property and effects (forcibly, if necessary) without
                           being guilty in any manner of trespass and without
                           any liability therefor and without prejudice to any
                           remedies of Authority in the event of default by
                           Tenant, and without liability for any interruption of
                           the conduct of the affairs of Tenant or those
                           claiming through or under Tenant which may result
                           from such entry. Tenant hereby irrevocably appoints
                           Authority as the agent and attorney-in-fact of Tenant
                           to remove all of Tenant's property whatsoever
                           situated upon the Premises and to place such property
                           in storage in any warehouse or other suitable place
                           in Tucson, Arizona, for the account of and at the
                           expense of Tenant and Tenant hereby exempts and
                           agrees to save harmless Authority from any costs,
                           loss or damage whatsoever arising or occasioned by
                           any such removal and storage of such property by
                           Authority or its duly authorized agents in accordance
                           with the provisions herein contained.

                                     Page 17


<PAGE>   19



                  (2)      Reletting. After such re-entry, Authority shall use
                           reasonable diligence to re-let the Premises, or any
                           part or parts thereof, for such period or periods and
                           upon such term or terms and at such reasonable rental
                           or rentals and upon such other conditions as
                           Authority may deem advisable, with the right to make
                           alterations and repairs to the Premises. Tenant
                           hereby irrevocably appoints Authority as the agent
                           and attorney-in-fact of Tenant to enter upon and
                           re-let the Premises and to incur any necessary
                           expenses in doing so, all to be reimbursed by Tenant.
                           Tenant agrees that no acts of Authority in effecting
                           such re-letting shall constitute a termination of
                           this Sublease, irrespective of the period for which
                           such re-letting is made or the terms and conditions
                           of such re-letting or otherwise.

                  (3)      Credit. Tenant shall receive a credit against such
                           rental in the amount of the proceeds, if any, of such
                           re-letting. Tenant's obligations, in addition to
                           rent, for which it shall remain liable include, but
                           shall not be limited to, all repossession costs,
                           brokerage commissions, legal expenses, attorneys'
                           fees, expenses of employees, removal costs,
                           alteration costs and expenses of preparation for
                           re-letting, and any other amounts expended pursuant
                           to action taken under this paragraph.

11.3     REMEDIES CUMULATIVE

         All rights, options and remedies of Authority contained in this
         Sublease shall be construed and held to be cumulative, and no one of
         them shall be exclusive of the other, and Authority shall have the
         right to pursue any one or all of such remedies or any other remedy or
         relief which may be provided by law, whether or not stated in this
         Sublease (including but not limited to any right of "self help" or
         similar remedy in order to minimize any damages, expenses, penalties
         and related fees or costs).

11.4     NO WAIVER

         No waiver of any Event of Default of Tenant hereunder shall be implied
         from any acceptance by Authority of any rent or other payments due
         hereunder or any omission by Authority to take any action on account of
         such default if such default persists or is repeated, and no express
         waiver shall affect an Event of Default in a manner other than as
         specified in said waiver. The consent or approval by Authority to or of
         any act by Tenant requiring Authority's consent or approval shall not
         be deemed to waive or render unnecessary Authority's consent or
         approval to or of any subsequent similar acts by Tenant.

11.5     NOTICE

         Any default notice tendered to Tenant hereunder shall be deemed to be
         sufficient if it is reasonably calculated to put Tenant on inquiry as
         to the nature and extent of such default.


                                     Page 18


<PAGE>   20


11.6     INTEREST

         All amounts due the Authority hereunder shall accumulate interest at a
         rate of 12% per annum or the maximum amount allowed by law, whichever
         is less.

                       ARTICLE XII - TERMINATION BY TENANT

12.1     TERMINATION EVENTS

         Tenant may terminate this Sublease at any time upon thirty (30) days
         written notice to Authority upon or after the happening or continuation
         of any of the following events:

                  A.       The inability of Tenant to use, for a period of
                           thirty (30) consecutive days, any portion of the
                           rights, licenses, services or privileges of Tenant
                           hereunder because of any law, rule, regulation or
                           other action or failure to act on the part of any
                           United States governmental authority having
                           jurisdiction thereof.

                  B.       The default by Authority in the performance of any
                           covenant or agreement herein required to be performed
                           by Authority and the failure of Authority to remedy
                           such default for a period of thirty (30) days after
                           receipt of written request or demand from Tenant to
                           remedy the same.

                  C.       The assumption by the United States government or any
                           authorized agency thereof of the operation or control
                           of the Airport or any part thereof, in such manner as
                           to substantially restrict Tenant for a period of at
                           least thirty (30) consecutive days from conducting
                           any of its operation on the Premises.

12.2     CURE

         If any of the foregoing reasons for termination by Tenant cease to
         exist prior to a termination, then the right to terminate for such
         reason shall cease.

12.3     NO WAIVER

         No waiver by Tenant of Authority's default of any of its obligations
         hereunder shall be construed to be or act as a waiver by Tenant of any
         subsequent default by Authority.

              ARTICLE XIII - SURRENDER OF POSSESSION, CONDITION OF
                                    PREMISES


13.1     SURRENDER

         Upon the expiration or earlier termination of this Sublease or any
         extensions thereof, all rights herein granted to Tenant shall cease and
         terminate and Tenant shall forthwith surrender


                                     Page 19


<PAGE>   21



         the Premises to Authority.

13.2     GOOD CONDITION

         The Premises shall be returned to Authority in as good condition as at
         the time of occupancy by Tenant, except as otherwise provided in this
         Sublease, ordinary wear and tear excepted.

13.3     REMOVAL OF PROPERTY

         Tenant, and Tenant's subtenants, may remove any and all personal
         property, including portable buildings, signs, trade fixtures,
         machinery and equipment from the Premises prior to expiration of this
         Sublease; provided, however, that Tenant shall repair any damage caused
         by such removal. Title to any property remaining in the Premises after
         expiration or termination of this Sublease shall vest in Authority and
         Authority shall have the right and option to remove the same, restore
         the Premises and recover from Tenant the costs and expenses of doing
         so.

                           ARTICLE XIV - MISCELLANEOUS

14.1     NOTIFICATION OF CHANGES

         Tenant shall promptly notify Authority of any change in Tenant's name
         or address or a change in ownership.

14.2     SUCCESSORS AND ASSIGNS BOUND

         All the terms, covenants and conditions of this Sublease shall extend
         to and bind the successors and assigns of the respective parties
         hereto.

14.3     ARTICLE HEADINGS

         The article headings contained herein are for convenience and reference
         and are not intended to define or limit the scope of any provisions of
         this Sublease.

14.4     SEVERABILITY

         If any term or condition of this Sublease shall be deemed to be invalid
         or unenforceable, all other terms and conditions shall remain in full
         force and effect.

14.5     APPLICABLE LAW

         The terms and conditions of this sublease shall be interpreted in
         accordance with the laws

                                     Page 20


<PAGE>   22


         of the State of Arizona.

14.6     CONSTRUCTION OF SUBLEASE

         Authority and Tenant agree that each party and its counsel have
         reviewed and revised this Sublease and that any rule of construction to
         the effect that ambiguities are to be resolved against the drafting
         party shall not apply in the interpretation of this Sublease. No remedy
         or election given by any provisions of this Sublease shall be deemed
         exclusive unless so indicated, but each shall, whenever possible, be
         cumulative with all other remedies in law or equity. Each provision
         hereof shall be deemed both a covenant and a condition and shall run
         with the land for the duration of the leasehold term or any extensions
         thereof. Whenever the content of any provision shall require it, the
         singular number shall be held to include the plural number and vice
         versa. The form of this Sublease contemplates that Tenant will be an
         entity and not one or more natural persons. If Tenant is one or more
         natural persons, then all pronouns referring to Tenant shall be deemed
         to be appropriately changed to fit those circumstances.

14.7     COSTS AND ATTORNEYS' FEES

         A.       AUTHORITY'S REVIEW

                  Tenant shall pay the expenses (including reasonable attorneys'
                  fees and the fees of other consultants) incurred by Authority
                  in reviewing any of the documents (including subleases, plans
                  and specifications of any improvements to be constructed by
                  Tenant, and documents created pursuant to Section ) for which
                  Authority's approval is required by the terms hereof.

         B.       ENFORCEMENT OF RIGHTS

                  The non-prevailing party shall promptly pay to the prevailing
                  party, upon demand, all costs and other expenses paid or
                  incurred by the prevailing party (including, without
                  limitation, reasonable attorney's fees) in enforcing or
                  exercising its rights or remedies created by, connected with
                  or provided for in this Sublease, whether or not any action or
                  proceeding is brought (including, without limitation, all such
                  costs, expenses and fees incurred in connection with any
                  bankruptcy, receivership, or other court proceedings [whether
                  at the trial or the appellate level]).

14.8     NOTICES

         A.       TO AUTHORITY

                  Notices to Authority in connection with this Sublease shall be
                  sufficiently served if physically delivered or sent by
                  certified mail, postage prepaid, addressed to Authority at the
                  address shown for it above.


                                     Page 21


<PAGE>   23



         B.       TO TENANT

                  Notices to Tenant in connection with this Sublease shall be
                  sufficiently served if physically delivered or sent by regular
                  mail, postage prepaid, addressed to Tenant at the address
                  shown for it above, provided that notice of utility
                  interference shall be sufficiently served if Authority gives
                  said notice to the current supervisor of Tenant's operations
                  on the Premises.

         C.       TIMING

                  Service of any notice or demand by physical delivery shall be
                  deemed complete upon the date of delivery. Service of any
                  notice or demand by certified mail shall be deemed complete at
                  the expiration of three (3) days after the date of the
                  certified mailing if mailed within the continental United
                  States.

         D.       CHANGE IN ADDRESS

                  Each party may change its address to such other addresses as
                  such party may designate to the other in writing from time to
                  time.


14.9     AUTHORITY TO EXECUTE

         Each party represents and warrants to the other that it has the right
         and authority to enter into this Sublease.

IN WITNESS WHEREOF the parties have executed this Sublease as of the day and
year first above written.

                                            TUCSON AIRPORT AUTHORITY, INC.,
                                              an Arizona nonprofit corporation

                                      By:   /s/ Signature Illegible
                                            ------------------------------------

                                      Its:
                                            ------------------------------------
                                            "AUTHORITY"


                                            AAS-COMPLETE CONTROLS, INC.
                                              an Arizona Corporation

                                      By:   /s/ Micah Chapman
                                            ------------------------------------
                                            Micah Chapman

                                      Its:  President
                                            ------------------------------------
                                            "TENANT"

                                     Page 22


<PAGE>   24


                                      By:   /s/ Joe Civiletto
                                            ------------------------------------
                                            Joe Civiletto

                                      Its:  Chief Operating Officer
                                            ------------------------------------
                                            "TENANT"



                                     Page 23


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