<PAGE>   1




                        INCENTIVE STOCK OPTION AGREEMENT
                                       FOR
                       OPTIONEE OF 1991 STOCK OPTION PLAN

     This Agreement is made as of the 13th day of February, 1997, between
AIRPORT SYSTEMS INTERNATIONAL, INC., a Kansas corporation (the "Company"), and
KARL GEMPERLI, an individual Consultant to the Company or any Subsidiary
("Optionee").

     1. BACKGROUND. In order to attract and retain the best available personnel
for positions of substantial responsibility in the Company or any Subsidiary and
to promote the success of the Company's business, the Company has adopted the
Restated 1991 Stock Option Plan (the "Plan"), a copy of which is attached hereto
as Exhibit A. Pursuant to the Plan certain Employees and Consultants of the
Company or any Subsidiary may be designated by the Board of Directors of the
Company to receive an option to purchase shares of Common Stock of the Company
("Common Stock"). Capitalized terms used herein and otherwise not defined have
the meaning ascribed to them in the Plan.

     2. GRANT OF OPTION. Subject to the provisions of paragraph 2(b) hereof, the
Company hereby grants to Optionee an option to purchase up to an aggregate of
15,000 Shares of Common Stock of the Company (the "Option Shares"), in
accordance with the vesting schedule set forth in Section 3 hereof (the
"Option"); provided however, that the Option is subject to the terms of the Plan
and the Stock Transfer Restriction Agreement for Exercise of Stock Option
attached hereto as Exhibit A ("Stock Restriction Agreement"), the provisions of
which are incorporated herein by reference and the terms of which shall control
in the event of any conflict with the terms hereof. The Option hereby granted is
an Incentive Stock Option.

     3. VESTING OF SHARES. The option to purchase shares of Common Stock shall
cumulatively vest and be exercisable for 5,000 shares of Common Stock on each of
February 13, 1998, February 13, 1999 and February 13, 2000; provided, however,
that the unvested portions of the Options shall vest and be exercisable
immediately prior to any of the following transactions: (i) the closing of the
Company's sale of all or substantially all of its assets or (ii) the acquisition
of the Company by another entity by means of a merger or consolidation resulting
in the exchange of the outstanding shares of Company's capital stock for
securities or consideration issued or caused to be issued by the acquiring
entity or its subsidiary or (iii) the acquisition from one or more of the
shareholders of the Company of more than fifty percent (50%) of the Common Stock
by a single person or group of persons acting together (collectively, a "Change
in Control Transaction"); provided further, however, that if the Change in
Control Transaction is with any person who is a holder of Common Stock on the
date hereof, or an entity under the control of such person through stock
ownership or otherwise, the unvested portion of the options shall not vest and
the options shall remain in effect to vest in accordance with the vesting
schedule set forth in this Section 3.




<PAGE>   2




4.   EXERCISE OF OPTION.

     (a) An Option shall be deemed to be exercised when the Optionee or other
authorized person gives to the Company written notice of such exercise and full
payment for the Option Shares with respect to which the Option is exercised has
been received by the Company. As a condition to the exercise of an Option, the
Company will require the Optionee to execute a Stock Restriction Agreement.

     (b) Until the issuance (as evidenced by the appropriate entry on the books
of the Company or of a duly authorized transfer agent of the Company) of the
stock certificate evidencing such Option Shares, no right to vote or receive
dividends or any other rights as a shareholder shall exist with respect to the
Option Shares, notwithstanding the exercise of the Option. The Company shall
issue (or cause to be issued) such stock certificates promptly upon exercise of
the Option. No adjustment will be made for a dividend or other right for which
the record date is prior to the date of the stock certificate is issued, except
as provided in Section 12 of the Plan.

     (c) Exercise of an Option in any manner shall result in a decrease in the 
number of Option Shares which thereafter may be available, both for purposes of
the Plan and for sale under the Option, by the number of Option Shares as to
which the Option is exercised.

5.    EXERCISE PRICE AND CONSIDERATION.

     (a) EXERCISE PRICE. The per Share exercise price for the Option Shares to
be issued pursuant to exercise of an Option shall be Five Dollars and Fifty
Cents ($5.50), which is equal to the closing price per share of the Common Stock
on the date hereof as listed on the NASDAQ National Market System as reported in
The Wall Street Journal.

     (b) FORM OF CONSIDERATION. The consideration to be paid for the Option
Shares to be issued upon exercise of an Option, including the method of payment,
shall be determined by the Board of Directors and may consist entirely of cash,
check, other shares of Common Stock having a fair market value on the date of
surrender equal to the aggregate exercise price of the Option Shares as to which
said option shall be exercised, or any combination of such methods of payment,
or such other consideration and method of payment for the issuance of Option
Shares to the extent permitted under the laws of the state of incorporation of
the Company. In making its determination as to the type of consideration to
accept, the Board of Directors shall consider if acceptance of such
consideration may be reasonably expected to benefit the Company.

     (c) FAIR MARKET VALUE. The fair market value of shares of Common Stock
delivered to the Company as payment of the purchase price upon exercise of an
Option shall be determined by the Board in its discretion; provided, however,
that where there is a public market for the Common Stock, the fair market value
per share of Common

 

                                       2

<PAGE>   3



  Stock shall be the mean of the bid and asked prices (or the closing
  price per share if the Common Stock is listed on the National Association of
  Securities Dealers Automated Quotation ("NASDAQ") National Market System) of
  the Common Stock for the date of grant, as reported in The Wall Street
  Journal (or, if not so reported, as otherwise reported by the NASDAQ System)
  or, if the Common Stock is listed on a stock exchange, the fair market value
  per share shall be the closing price on such exchange on the date of grant of
  the Option, as reported in The Wall Street Journal.

     6.   TERM OF OPTION.

     (a) GENERAL RULE. Except as provided in Section 6(b) and Section 6(c)

  hereof and in Section 10 and Section 12 of the Plan, the term of each
  Option granted pursuant to Section 2 hereof shall be ten (10) years from the
  date hereof.

     (b) EMPLOYMENT OF OPTIONEE TERMINATED. Notwithstanding anything provided to
  the contrary in the Plan, if Optionee's employment with the Company or
  any Subsidiary is terminated by the Company or any Subsidiary (i) for fraud
  or dishonesty of Optionee in connection with fulfillment of his duties and
  responsibilities as an employee of the Company or any Subsidiary, including
  without limitation, embezzlement of Company or Subsidiary funds; or (ii)
  because employee is charged with a felony under any applicable criminal code
  or statute, or (iii) if Optionee quits the employment of the Company or any
  Subsidiary, then all unexercised Options, whether vested or unvested, shall
  terminate immediately upon such termination of employment. If Optionee's
  employment with the Company or any subsidiary is terminated for a reason
  other than those described in the preceding sentence the unvested portion of
  the Option shall terminate immediately and the entire portion of the Option
  which was vested prior to termination of Employee's employment, to the extent
  that it was exercisable at the date of termination of Employee's employment,
  shall be exercisable for sixty (60) days following Employee's termination
  date. To the extent that the Option was not exercisable on the Employee's
  termination date, or if the Option is not exercised (to the extent it was
  entitled to be exercised), within the 60 day period, the Option shall
  terminate.

     (c) BREACH OF NON-DISCLOSURE COVENANT NOT TO COMPETE. Notwithstanding
  anything provided to the contrary in the Plan, if Optionee breaches any
  applicable nondisclosure covenant or covenant not to compete set forth in any
  employment agreement between Optionee and the Company or a Subsidiary, or
  otherwise applicable to Optionee under the law of the jurisdiction where
  Optionee is employed, then all unexercised Options, whether vested or
  unvested, shall immediately terminate.

     7. NON-TRANSFERABILITY OF OPTIONS. The Option may not be sold, pledged,
assigned, hypothecated, transferred, or disposed of in any manner other than by
will or by the laws of descent or distribution and may be exercised, during the
lifetime of the Optionee, only by the Optionee.


                                       3

<PAGE>   4



8. Conditions Upon Issuance of Option Shares.

     (a) Option Shares shall not be issued pursuant to the exercise of an Option
  unless the exercise of such Option and the issuance and delivery of
  such Option Shares pursuant thereto shall comply with all relevant provisions
  of law, including, without limitation, the Securities Act of 1933, as
  amended, the Securities Exchange Act of 1934, as amended, the rules and
  regulations promulgated thereunder, and the requirements of any stock
  exchange upon which the Common Stock may then be listed, and shall be further
  subject to the reasonable approval of counsel for the Company with respect to
  such compliance.

     (b) As a condition to the exercise of an Option, the Company may require
  the person exercising such Option to represent and warrant at the time
  of any such exercise that the Option Shares are being purchased only for
  investment and without any present intention to sell or distribute such
  Option Shares if, in the reasonable opinion of counsel for the Company, such
  a representation is required by any of the aforementioned relevant provisions
  of law.

     (c) As a condition to the issuance of Option Shares, the Optionee shall (a)
  remit to the Company at the time of any exercise of the Option any
  taxes required to be withheld by the Company under federal, state or local
  laws as a result of the exercise of the Option, and/or (b) instruct the
  Company to withhold in accordance with applicable law from any compensation
  payable to the Optionee the taxes required to be held by the Company under
  federal, state or local laws result of the exercise of the Option. The
  determination of the amount of any such withholding shall be made by the
  Company in its sole discretion.

     (d) All Option Shares issued pursuant to the exercise of the Option shall
  be subject to the terms and provisions of the Stock Restriction
  Agreement, an example of which is attached hereto as Exhibit B.

     IN WITNESS WHEREOF, the parties hereto have executed this Agreement the
date first above written.


                                                       OPTIONEE


                                                       /s/ Karl Gemperli
                                                       -------------------------
                                                       Name: Karl Gemperli



                                       4
<PAGE>   5



                                   AIRPORT SYSTEMS INTERNATIONAL, INC.
                                         a Kansas corporation



                                        
                                   By:
                                      --------------------------------------- 
                                         Keith S. Cowan, President



Exhibits

A. Restated 1991 Stock Option Plan
B. Stock Transfer Restriction Agreement


                                       5



<PAGE>   6





                                    EXHIBIT A

                       AIRPORT SYSTEMS INTERNATIONAL, INC.
                             1991 STOCK OPTION PLAN

     1. Purposes of the Plan. The purposes of this Stock Option Plan are to
attract and retain the best available personnel for positions of substantial
responsibility, to provide additional incentive to the Employees and Consultants
of the Company and to promote the success of the Company's business.

     Options granted hereunder may be either Incentive Stock Options or
Nonstatutory Stock Options, at the discretion of the Board and as reflected in
the terms of the written option agreement.

     2. Definitions. As used herein, the following definitions shall apply:

     (a) "Board" shall mean the Committee, if one has been appointed, or the
Board of Directors of the Company, if no Committee is appointed.

     (b) "Code" shall mean the Internal Revenue Code of 1986, as amended.

     (c) "Common Stock" shall mean the Common Stock of the Company.

     (d) "Company" shall mean Airport Systems International, Inc., a Kansas
corporation.

     (e) "Committee" shall mean the Committee appointed by the Board of
Directors in accordance with paragraph (a) of Section 4 of the Plan, if one is
appointed.

     (f) "Consultant" shall mean any person who is engaged by the Company or any
subsidiary to render consulting services and is compensated for such consulting
services or any other person determined by the Board to have performed services
for or on behalf of the Company which merits the grant of an Option, and any
director of the Company whether compensated for such services or not; provided
that if and in the event the Company registers any class of any equity security
pursuant to Section 12 of the Securities Exchange Act of 1934, as amended (the
"Exchange Act"), the term Consultant shall thereafter not include directors who
are not compensated for their services or are paid only a director's fee by the
Company.

     (g) "Continuous Status as an Employee or Consultant" shall mean the absence
of any interruption or termination of service as an Employee or Consultant.
Continuous Status as an Employee or Consultant shall not be considered
interrupted in the case of sick leave, military leave, or any other leave of
absence approved by the Board; provided that such leave is for a period of not
more than 90 days or reemployment upon the expiration of such leave is
guaranteed by contract or statute.

     (h) "Employee" shall mean any person, including officers and directors,
employed by the Company or any Parent or Subsidiary of the Company. The payment
of a director's fee by the Company shall not be sufficient to constitute
"employment" by the Company.





<PAGE>   7



     (i) "Incentive Stock Option" shall mean an Option intended to qualify as an
incentive stock option within the meaning of Section 422A of the Code.

     (j) "Nonstatutory Stock Option" shall mean an Option not intended to
qualify as an Incentive Stock Option.

     (k) "Option" shall mean a stock option granted pursuant to the Plan.

     (1) "Optioned Stock" shall mean the Common Stock subject to an Option.

     (m) "Optionee" shall mean an Employee or Consultant who receives an Option.

     (n) "Parent" shall mean a "parent corporation", whether now or hereafter
existing, as defined in Section 425(e) of the Code.

     (o) "Plan" shall mean this 1991 Stock Option Plan.

     (p) "Share" shall mean a share of the Common Stock, as adjusted in
accordance with Section 12 of the Plan.

     (q) "Subsidiary" shall mean a "subsidiary corporation", whether now or
hereafter existing, as defined in Section 425(f) of the Code.

     3. Stock Subject to the Plan. Subject to the provisions of Section 12 of
the Plan, the maximum aggregate number of shares which may be optioned and sold
under the Plan is 120,000 shares of Common Stock. The Shares may be authorized,
but unissued, or reacquired Common Stock.

     If an Option should expire or become unexercisable for any reason without
having been exercised in full, the unpurchased Shares which were subject thereto
shall, unless the Plan shall have been terminated, become available for future
grant under the Plan. Notwithstanding any other provision of the Plan, shares
issued under the Plan and later repurchased by the Company shall become
available for future grant or sale under the Plan.

     4. Administration of the Plan.

     (a) Procedure. The Plan shall be administered by the Board of Directors of
the Company.

        (i)     Subject to subparagraph (ii), the Board of Directors may appoint
     a Committee consisting of not less than two members of the Board of
     Directors to administer the Plan on behalf of the Board of Directors,
     subject to such terms and conditions as the Board of Directors may
     prescribe. Once appointed, the Committee shall continue to serve until
     otherwise directed by the Board of Directors. Members of the Board who are
     either eligible for Options or have been granted Options may vote on any
     matters affecting the administration of the Plan or the grant of any
     Options pursuant to the Plan, except that no such member shall act upon the
     granting of an Option to himself, but any such member may be counted in
     determining the existence of

                                       -2-




<PAGE>   8



     a quorum at any meeting of the Board during which action is taken with
     respect to the granting of Options to him.

          (ii)  Notwithstanding the foregoing subparagraph (i), if and in any 
     event the Company registers any class of any equity security pursuant to
     Section 12 of the Exchange Act, from the effective date of such
     registration (the "Effective Date") until six months after the
     termination of such registration (the "Termination Date"), any grants of
     options to officers or directors shall only be made by the Board of
     Directors; provided, however, that if a majority of the Board of Directors
     is eligible to participate in this Plan or any other stock option or other
     stock plan of the Company or any of its affiliates, or has been eligible at
     any time within the preceding year, any grants of options to directors must
     be made by, or only in accordance with the recommendation of, a Committee
     consisting of three or more persons, who may but need not be directors or
     employees of the Company, appointed by the Board of Directors and having
     full authority to act in the matter, none of whom is eligible to
     participate in this Plan or any other stock option or other stock plan of
     the Company or any of its affiliates, or has been eligible at any time
     within the preceding year. Any Committee administering the Plan with
     respect to grants to officers who are not also directors shall conform to
     the requirements of the preceding sentence. Once appointed, the Committee
     shall continue to serve until otherwise directed by the Board of Directors.

          (iii) Subject to the foregoing subparagraphs (i) and (ii), from time
     to time the Board of Directors may increase the size of the Committee and
     appoint additional members thereof, remove members (with or without cause)
     and appoint new members in substitution therefor, fill vacancies however
     caused, or remove all members of the Committee and thereafter directly
     administer the Plan.


     (b) Powers of the Board. Subject to the provisions of the Plan, the Board
shall have the authority, in its discretion: (i) to grant Incentive Stock
Options or Nonstatutory Stock Options; (ii) to determine upon review of relevant
information and in accordance with Section 8(b) of the Plan, the fair market
value of the Common Stock, (iii) to determine the exercise price per share of
Options to be granted, which exercise price shall be determined in accordance
with Section 8(a) of the Plan; (iv) to determine the Employees or Consultants to
whom, and the time or times at which, Options shall be granted and the number of
shares to be represented by each Option; (v) to interpret the Plan; (vi) to
prescribe, amend and rescind rules and regulations relating to the Plan; (vii)
to determine the terms and provisions of each Option granted (which need not be
identical) and, with the consent of the holder thereof, modify or amend each
Option; (viii) to accelerate or defer (with the consent of the Optionee) the
exercise date of any Option, consistent with the provisions of Section 5 of the
Plan; (ix) to authorize any person to execute on behalf of the Company any
instrument required to effectuate the grant of an Option previously granted by
the Board; and (x) to make all other determinations deemed necessary or
advisable for the administration of the Plan.

     (c) Effect of Board's Decision. All decisions, determinations and
interpretations of the Board shall be final and binding on all Optionees and any
other holders of any Options granted under the Plan.



                                      -3-
<PAGE>   9

     5.  Eligibility

     (a) Options may be granted only to Employees and Consultants. Incentive
Stock Options may be granted only to Employees. An Employee or Consultant who
has been granted an Option may, if he is otherwise eligible, be granted an
additional Option or Options.

     (b) To the extent that the aggregate fair market value of Common Stock with
respect to which Incentive Stock Options are exercisable for the first time by
any Optionee during any calendar year (under all plans of the Company or any
Parent or Subsidiary) exceeds $100,000, such Incentive Stock Options shall be
treated as Nonstatutory Stock Options.

     (c) Section 5(b) of the Plan shall apply only to an Incentive Stock Option
evidenced by an "Incentive Stock Option Agreement" which sets forth the
intention of the Company and the Optionee that such Option shall qualify as an
incentive stock option. Section 5(b) of the Plan shall not apply to any Option
evidenced by a "Nonstatutory Stock Option Agreement" which sets forth the
intention of the Company and the Optionee that such Option shall be a
Nonstatutory Stock Option.

     (d) The Plan shall not confer upon any Optionee any right with respect to
continuation of employment or consulting relationship with the Company, nor
shall it interfere in any way with his right or the Company's right to terminate
his employment or consulting relationship at any time.

     6. Term of Plan. The Plan shall become effective upon the earlier to occur
of its adoption by the Board of Directors or its approval by the shareholders of
the Company as described in Section 18 of the Plan. It shall continue in effect
for a term of ten (10) years unless sooner terminated under Section 14 of the
Plan.

     7. Term of Option. The term of each Incentive Stock Option shall be ten
(10) years from the date of grant thereof or such shorter term as may be
provided in the Incentive Stock Option Agreement. The term of each Option that
is not an Incentive Stock Option shall be determined by the Board and set forth
in the Option Agreement. However, in the case of an Incentive Stock Option
granted to an Optionee who, at the time the Incentive Stock Option is granted,
owns stock representing more than ten percent (10%) of the voting power of all
classes of stock of the Company or any Parent or Subsidiary, the term of the
Incentive Stock Option shall be five (5) years from the date of grant thereof or
such shorter time as may be provided in the Incentive Stock Option Agreement.

     8. Exercise Price and Consideration.

     (a) Exercise Price. The per Share exercise price for the Shares to be
issued pursuant to exercise of an Option shall be such price as is determined by
the Board, but shall be subject to the following:

          (i) In the case of an Incentive Stock Option



                                      -4-
<PAGE>   10



               (A) granted to an Employee who, at the time of the grant of such
          Incentive Stock Option, owns stock representing more than ten percent
          (10%) of the voting power of all classes of stock of the Company or
          any Parent or Subsidiary, the per Share exercise price shall be no
          less than 110% of the fair market value per Share on the date of
          grant.

               (B) granted to any Employee, the per Share exercise price shall
          be no less than 100% of the fair market value per Share on the date of
          grant.

          (ii) In the case of an Option granted on or after the effective date
     of registration of any class of equity security of the Company pursuant to
     Section 12 of the Exchange Act and prior to six months after the
     termination of such registration, the per Share exercise price shall be no
     less than 100% of the fair market value per Share on the date of grant.

     (b) Fair Market Value. The fair market value shall be determined by the
Board in its discretion; provided, however, that where there is a public market
for the Common Stock, the fair market value per Share shall be the mean of the
bid and asked prices (or the closing price per share if the Common Stock listed
on that National Association of Securities Dealers Automated Quotation
("NASDAQ") National Market System) of the Common Stock for the date of grant, as
reported in The Wall Street Journal (or, if not so reported, as otherwise
reported by the NASDAQ System) or, in the event the Common Stock is listed on a
stock exchange, the fair market value per Share shall be the closing price on
such exchange on the date of grant of the Option, as reported in The Wall Street
Journal.

     (c) Form of Consideration. The consideration to be paid for the Shares to
be issued upon exercise of an Option, including the method of payment, shall be
determined by the Board and may consist entirely of cash, check, other Shares of
Common Stock having a fair market value on the date of surrender equal to the
aggregate exercise price of the Shares as to which said option shall be
exercised, or any combination of such methods of payment, or such other
consideration and method of payment for the issuance of Shares to the extent
permitted under Sections 152, 153 and 157 of the Delaware General Corporation
Law. In making its determination as to the type of consideration to accept, the
Board shall consider if acceptance of such consideration may be reasonably
expected to benefit the Company.

     9. Exercise of Option.

     (a) Procedure for Exercise; Rights as a Shareholder. Any Option granted
hereunder shall be exercisable at such times and under such conditions as
determined by the Board, including performance criteria with respect to the
Company and/or the Optionee, and as shall be permissible under the terms of the
Plan.

     An Option may not be exercised for a fraction of a Share.

     An Option shall be deemed to be exercised when written notice of such
exercise in the form required by the Nonstatutory or Incentive Stock Option
Agreement has been given to the


                                     -5-

<PAGE>   11



Company in accordance with the terms of the Option by the person entitled to
exercise the Option and full payment for the Shares with respect to which the
Option is exercised has been received by the Company. Full payment may, as
authorized by the Board, consist of any consideration and method of payment
allowable under Section 8(c) of the Plan. Under the issuance (as evidenced by
the appropriate entry on the books of the Company or of a duly authorized
transfer agent of the Company) of the stock certificate evidencing such Shares,
no right to vote or receive dividends or any other rights as a shareholder shall
exist with respect to the Optioned Stock, notwithstanding the exercise of the
Option. The Company shall issue (or cause to be issued) such stock certificate
promptly upon exercise of the Option. No adjustment will be made for a dividend
or other right for which the record date is prior to the date the stock
certificate is issued, except as provided in Section 12 of the Plan.

     Exercise of an Option in any manner shall result in a decrease in the
number of Shares which thereafter may be available, both for purposes of the
Plan and for purchase under the Option, by the number of Shares as to which the
Option is exercised.

     10. Certain Events Affecting Exercisability of Incentive Stock Options.

     (a) Termination of Status as an Employee or Consultant. With respect to
Incentive Stock Options, in the event of termination of an Optionee's Continuous
Status as an Employee or Consultant (as the case may be), such Optionee may, but
only within sixty (60) days (or such other period of time not exceeding three
(3) months as is determined by the Board, with such determination being made at
the time of grant of the Option) after such event of termination of an
Optionee's Continuous Status as an Employee or Consultant (as the case may be)
(but in no event later than the date of expiration of the term of such Incentive
Stock Option as set forth in the Incentive Stock Option Agreement), exercise his
Incentive Stock Option to the extent that he was entitled to exercise it at the
date of such termination. To the extent that he was not entitled to exercise the
Incentive Stock Option at the date of such termination, or if he does not
exercise such Incentive Stock Option (which he was entitled to exercise) within
the time specified herein, the Incentive Stock Option shall terminate.

     (b) Disability of Optionee. With respect to Incentive Stock Options,
notwithstanding the provision of Section 10(a) above, in the event of
termination of an Optionee's Continuous Status as an Employee or Consultant (as
the case may be) as a result of his total and permanent disability (as defined
in Section 22(e)(3) of the Code), he may, but only within six (6) months (or
such other period of time not exceeding twelve (12) months as is determined by
the Board, with such determination being made at the time of grant of the
Incentive Stock Option) from the date of termination (but in no event later than
the date of expiration of the term of such Incentive Stock Option as set forth
in the Incentive Stock Option Agreement), exercise his Incentive Stock Option to
the extent he was entitled to exercise it at the date of such termination. To
the extent that he was not entitled to exercise the Incentive Stock Option at
the date of termination, or if he does not exercise such Incentive Stock Option
(which he was entitled to exercise) within the time specified herein, the
Incentive Stock Option shall terminate.

     (c) Death of Optionee. With respect to Incentive Stock Options, in the
event of the death of an Optionee:


                                      -6-

<PAGE>   12



          (i)  who is at the time of his death an Employee or Consultant of the
     Company and who shall have been in Continuous Status as an Employee or
     Consultant since the date of grant of the Incentive Stock Option, the
     Incentive Stock Option may be exercised, at any time within nine (9) months
     following the date of death (but in no event later than the date of
     expiration of the term of such Incentive Stock Option as set forth in the
     Incentive Stock Option Agreement), by the Optionee's estate or by a person
     who acquired the right to exercise the Incentive Stock Option by bequest or
     inheritance, but only to the extent of the right to exercise that would
     have accrued had the Optionee continued living and remained in Continuous
     Status as an Employee or Consultant six (6) months after the date of death,
     subject to the limitation set forth in Section 5(b); or

          (ii) which occurs within thirty (30) days (or such other period of
     time not exceeding three (3) months as is determined by the Board, with
     such determination being made at the time of grant of the Incentive Stock
     Option) after the termination of Continuous Status as an Employee or
     Consultant, the Incentive Stock Option may be exercised, at any time within
     nine (9) months following the date of death (but in no event later than the
     date of expiration of the term of such Incentive Stock Option as set forth
     in the Incentive Stock Option Agreement), by the Optionee's estate or by a
     person who acquired the right to exercise the Incentive Stock Option by
     bequest or inheritance, but only to the extent of the right to exercise
     that had accrued at the date of termination.

     11. Non-Transferability of Options. The Option may not be sold, pledged,
assigned, hypothecated, transferred, or disposed of in any manner other than by
will or by the laws of descent or distribution and may be exercised, during the
lifetime of the Optionee, only by the Optionee.

     12. Adjustments Upon Changes in Capitalization or Merger. Subject to any
required action by the shareholders of the Company, the number of shares of
Common Stock covered by each outstanding Option, and the number of shares of
Common Stock which have been authorized for issuance under the Plan but as to
which no Options have yet been granted or which have been returned to the Plan
upon cancellation or expiration of an Option, as well as the price per share of
Common Stock covered by each such outstanding Option, shall be proportionately
adjusted for any increase or decrease in the number of issued shares of Common
Stock resulting from a stock split, reverse stock split, stock dividend,
combination or reclassification of the Common Stock, or any other increase or
decrease in the number of issued shares of Common Stock effected without receipt
of consideration by the Company; provided, however, that conversion of any
convertible securities of the Company shall not be deemed to have been "effected
without receipt of consideration." Such adjustment shall be made by the Board,
whose determination in that respect shall be final, binding and conclusive.
Except as expressly provided herein, no issuance by the Company of shares of
stock of any class, or securities convertible into shares of stock of any class,
shall affect, and no adjustment by reason thereof shall be made with respect to,
the number or price of shares of Common Stock subject to an Option.



                                      -7-
<PAGE>   13





     In the event of the proposed dissolution or liquidation of the Company, the
Option will terminate immediately prior to the consummation of such proposed
action, unless otherwise provided by the Board. The Board may, in the exercise
of its sole discretion in such instances, declare that any Option shall
terminate as of a date fixed by the Board and give each Optionee the right to
exercise his Option as to all or any part of the Optioned Stock, including
Shares as to which the Option would not otherwise be exercisable. In the event
of a proposed sale of all or substantially all of the assets of the Company, or
the merger of the Company with or into another corporation, the Option shall be
assumed or an equivalent option shall be substituted by such successor
corporation or a parent or subsidiary of such successor corporation. Unless the
option agreement granting an Option to an Optionee specifically provides
otherwise, in the event that such successor corporation refuses to assume the
Option or to substitute an equivalent option, the Board shall, in lieu of such
assumption or substitution, provide for the Optionee to have the right to
exercise the Option as to all of the Optioned Stock, including Shares as to
which the Option would not otherwise be exercisable. The Board shall give
written notice to each holder of an Option of the pendency of the sale of
substantially all of the assets of the Company, a merger involving the Company
or the dissolution or liquidation of the Company not less than ten days prior to
such transaction. If the Board makes an Option fully exercisable in lieu of
assumption or substitution in the event of a merger or sale of assets, the Board
shall notify the Optionee that the Option shall be fully exercisable for a
period of thirty (30) days from the date of such notice, and the Option will
terminate upon the expiration of such period.

     13. Time of Granting Options. The date of grant of an Option shall, for all
purposes, be the date on which the Board makes the determination granting such
Option. Notice of the determination shall be given to each Employee or
Consultant to whom an Option is so granted within a reasonable time after the
date of such grant.

     14. Amendment and Termination of the Plan.

     (a) Amendment and Termination. The Board may amend or terminate the Plan
from time to time in such respects as the Board may deem advisable; provided
that, the following revisions or amendments shall require approval of the
shareholders of the Company in the manner described in Section 18 of the Plan:

          (i)   any increase in the number of Shares subject to the Plan, other
     than in connection with an adjustment under Section 12 of the Plan;

          (ii)  any change in the designation of the class of persons eligible 
     to be granted Options; or

          (iii) if the Company has a class of equity securities registered under
     Section 14 of the Exchange Act at the time of such revision or amendment,
     any material increase in the benefit accruing to participants under the
     Plan.

     (b) Shareholder Approval. If any amendment requiring shareholder approval
under Section 14(a) of the Plan is made subsequent to the first registration of
any class of equity



                                      -8-
<PAGE>   14



securities by the Company under Section 12 of the Exchange Act, such shareholder
approval shall be solicited as described in Section 18 of the Plan.

     (c) Effect of Amendment or Termination. Any such amendment or termination
of the Plan shall not affect Options already granted and such Options shall
remain in full force and effect as if this Plan had not been amended or
terminated, unless mutually agreed otherwise between the Optionee and the Board,
which agreement must be in writing and signed by the Optionee and the Company.

     15. Conditions Upon Issuance of Shares. Shares shall not be issued pursuant
to the exercise of an Option unless the exercise of such Option and the issuance
and delivery of such Shares pursuant thereto shall comply with all relevant
provisions of law, including, without limitation, the Securities Act of 1933, as
amended, the Exchange Act, the rules and regulations promulgated thereunder, and
the requirements of any stock exchange upon which the Shares may then be listed,
and shall be further subject to the approval of counsel for the Company with
respect to such compliance.

     As a condition to the exercise of an Option, the Company may require the
person exercising such Option to represent and warrant at the time of any such
exercise that the Shares are being purchased only for investment and without any
present intention to sell or distribute such Shares if, in the opinion of
counsel for the Company, such a representation is required by any of the
aforementioned relevant provisions of law.

     16. Reservation of Shares. The Company, during the term of this Plan, will
at all times reserve and keep available such number of Shares as shall be
sufficient to satisfy the requirements of the Plan.

     The inability of the Company to obtain authority from any regulatory body
having jurisdiction, which authority is deemed by the Company's counsel to be
necessary to the lawful issuance and sale of any Shares hereunder, shall relieve
the Company of any liability in respect of the failure to issue or sell such
Shares as to which such requisite authority shall not have been obtained.

     17. Option Agreement. Options shall be evidenced by written option
agreements in such form as the Board shall approve.

     18. Shareholder Approval.

     (a) Continuance of the Plan shall be subject to approval by the
shareholders of the Company within twelve (12) months before or after the date
the Plan is adopted. If such shareholder approval is obtained at a duly held
shareholders' meeting, it must be obtained by the affirmative vote of the
holders of a majority of the outstanding shares of the Company, or if such
shareholder approval is obtained by written consent, it must be obtained by the
unanimous written consent of all shareholders of the Company; provided, however,
that approval at a meeting or by written consent may be obtained by a lesser
degree of shareholder approval if the Board determines, in its discretion after
consultation with the Company's legal counsel,



                                      -9-
<PAGE>   15



that such a lesser degree of shareholder approval will comply with all
applicable laws and will not adversely affect the qualification of the Plan
under Section 422A of the Code.

     (b) If and in the event that the Company registers any class of equity
securities pursuant to Section 12 of the Exchange Act, any required approval of
the shareholders of the Company obtained after such registration shall be
solicited substantially in accordance with Section 14(a) of the Exchange Act and
the rules and regulations promulgated thereunder.

     (c) If any required approval by the shareholders of the Plan itself or of
any amendment thereto is solicited at any time otherwise than in the manner
described in Section 18(b) hereof, then the Company shall, at or prior to the
first annual meeting of shareholders held subsequent to the later of (1) the
first registration of any class of equity securities of the Company under
Section 12 of the Exchange Act or (2) the granting of an Option hereunder to an
officer or director after such registration, do the following:

          (i)  furnish in writing to the holders entitled to vote for the Plan
     substantially the same information which would be required (if proxies to
     be voted with respect to approval or disapproval of the Plan or amendment
     were then being solicited) by the rules and regulations in effect under
     Section 14(a) of the Exchange Act at the time such information is
     furnished; and

          (ii) file with, or mail for filing to, the Securities and Exchange
     Commission four copies of the written information referred to in subsection
     (i) hereof not later than the date on which such information is first sent
     or given to shareholders.

     19. Gender Reference. The words "he", "him" or "his" shall be deemed to
include the feminine and neuter gender of such words.

     Adopted by the Board of Directors of Airport Systems International, Inc. on
December 3, 1991.



                                                  /s/ Thomas Blackburn
                                                  ---------------------------
                                                  Thomas Blackburn, Secretary


                                      -10-





<PAGE>   16



                                                                      EXHIBIT B

                       AIRPORT SYSTEMS INTERNATIONAL, INC.
                      STOCK TRANSFER RESTRICTION AGREEMENT
                          FOR EXERCISE OF STOCK OPTION

     THIS AGREEMENT is made between _________________________ (the "Purchaser")
and AIRPORT SYSTEMS INTERNATIONAL, INC. (the "Company"), as of ________________.

                                     RECITAL

     Pursuant to the exercise of a stock option granted to the Purchaser dated
as of April 12, 1993 by and between the Company and the Purchaser (the "Option
Agreement"), the Purchaser has elected to purchase 3,000 shares of Company
common stock, par value $.01 per share ("Common Stock"), which have become
vested under the vesting schedule set forth in Section 3 of the Option Agreement
(the "Shares"). Purchaser has made full payment for the Shares in the manner
provided by Section 5 of the Option Agreement.

     1. CERTAIN RESTRICTIONS. The Shares are subject to the terms and provisions
of this Agreement. The Company shall not be required (a) to transfer on its
books any Shares which shall have been sold or transferred in violation of any
of the provisions set forth in this Agreement, or (b) to treat as the owner of
such Shares or to accord the right to vote as such owner or to pay dividends to
any transferee to whom such Shares shall have been so transferred.

     2. PURCHASER'S INVESTMENT REPRESENTATIONS. In connection with the purchase
of the Shares, the Purchaser hereby represents and warrants to the Company the
following:

        (a) INVESTMENT INTENT; CAPACITY TO PROTECT INTERESTS. The Purchaser is
     purchasing the Shares solely for his own account for investment and not
     with a view to or for sale in connection with any distribution of the
     Shares or any portion thereof and not with any present intention of
     selling, offering to sell or otherwise disposing of or distributing the
     Shares or any portion thereof in any transaction other than a transaction
     exempt from registration under the Securities Act of 1933, as amended (the
     "Act"). The Purchaser also represents that the entire legal and beneficial
     interest of the Shares is being purchased, and will be held, for the
     Purchaser's account only, and neither in whole or in part for any other
     person. Purchaser either has a pre-existing business or personal
     relationship with the Company or any of its officers, directors or
     controlling persons or by reason of Purchaser's business or financial
     experience or the business or financial experience of Purchaser's
     professional advisors who are unaffiliated with and who are not compensated
     by the Company or any affiliate or selling agent of the Company,




<PAGE>   17



directly or indirectly, could be reasonably assumed to have the capacity to
evaluate the merits and risks of an investment in the Company and to protect
Purchaser's own interests in connection with this transaction.

     (b) RESIDENCE. The Purchaser's principal residence is at the address set
forth beneath Purchaser's signature on this Agreement.

     (c) INFORMATION CONCERNING COMPANY. The Purchaser has heretofore discussed
the Company and its plans, operations and financial condition with the Company's
officers and has heretofore received all such information as the Purchaser has
deemed necessary and appropriate to enable the Purchaser to evaluate the
financial risk inherent in making an investment in the Shares, and the Purchaser
has received satisfactory and complete information concerning the business and
financial condition of the Company in response to all inquiries in respect
thereof.

     (d) ECONOMIC RISK. The Purchaser realizes that the purchase of the Shares
will be a highly speculative investment and involves a high degree of risk, and
the Purchaser is able, without impairing his financial condition, to hold the
Shares for an indefinite period of time and to suffer a complete loss on the
Purchaser's investment.

     (e) RESTRICTED SECURITIES. The Purchaser understands and acknowledges that:

          (i)   the sale of the Shares has not been registered under the Act,
     the Shares must be held indefinitely unless subsequently registered under
     the Act or an exemption from such registration is available, and the
     Company is under no obligation to register the Shares;

          (ii)  the share certificate representing the Shares will be stamped
     with a legend in substantially the following form:

          THE SHARES REPRESENTED BY THIS CERTIFICATE HAVE NOT BEEN
         REGISTERED PURSUANT TO THE SECURITIES ACT OF 1933, AS AMENDED, OR
         PURSUANT TO ANY STATE SECURITIES LAWS. THESE SHARES MAY NOT BE SOLD OR
         OTHERWISE TRANSFERRED UNLESS SUCH ARE FIRST REGISTERED PURSUANT TO THE
         APPLICABLE FEDERAL AND STATE SECURITIES LAWS OR UNLESS THE CORPORATION
         RECEIVES A WRITTEN OPINION OF COUNSEL WHICH OPINION AND COUNSEL ARE
         SATISFACTORY TO THE CORPORATION THAT SUCH REGISTRATION IS NOT
         REQUIRED; and

          (iii) the Company will make a notation in its records of the
     aforementioned restrictions on transfer and legends.


                                      3

<PAGE>   18



     (f) DISPOSITION UNDER RULE 144. The Purchaser understands that the Shares
are restricted securities within the meaning of Rule 144 promulgated under the
Act; that the exemption from registration under Rule 144 will not be available
in any event for at least two years from the date of payment for the Shares, and
then will not be available unless (i) a public trading market then exists for
the Common Stock of the Company, (ii) adequate information concerning the
Company is then available to the public, and (iii) other terms and conditions of
Rule 144 are complied with; and that any sale of the Shares may be made only in
limited amounts in accordance with such terms and conditions.

     (g) FURTHER LIMITATIONS ON DISPOSITION. Without in any way limiting his
representations set forth above, the Purchaser further agrees that he shall in
no event make any disposition of all or any portion of the Shares unless and
until:

          (i)(A) There is then in effect a Registration Statement under the Act
     covering such proposed disposition and such disposition is made in
     accordance with said registration Statement; or, (B)(1) the Purchaser shall
     have notified the Company of the proposed disposition and shall have
     furnished the Company with a detailed statement of the circumstances
     surrounding the proposed disposition, (2) the Purchaser shall have
     furnished the Company with an opinion of the Purchaser's counsel to the
     effect that such disposition will not require registration of such shares
     under the Act, and (3) such opinion of the Purchaser's counsel shall have
     been concurred in by counsel for the Company and the Company shall have
     advised the Purchaser of such concurrence; and,

          (ii) The Purchaser shall have complied with the provisions of this
     Agreement.

     3. COUNTERPARTS. This Agreement may be executed in one or more
counterparts, each of which shall be deemed an original, but all of which shall
constitute one and the same document.

     4. BINDING EFFECT; ASSIGNMENT. This Agreement shall be binding upon and
inure to the benefit of the parties and their respective successors, assigns,
heirs and legal representatives. This Agreement is not assignable by any party
hereto without the prior written consent of the other party.

     5. NOTICES. All notices required or permitted to be given hereunder shall
be in writing and shall be deemed to have been duly given if delivered
personally, or sent by express mail service that provides for confirmation of
delivery, telecopy, facsimile or other electronic transmission to the extent
receipt is confirmed, or mailed first class, postage prepaid, registered or
certified mail, addressed to the Purchaser at the address set forth beneath
Purchaser's signature on this Agreement and to the Company as follows:

                                        4




<PAGE>   19



        Airport Systems International, Inc.
        11300 West 89th Street 
        Overland Park, Kansas 66214
        Attention: President 
        Facsimile No.: (913) 492-0870

with a copy to:

        David D. Gatchell        
        Sonnenschein Nath & Rosenthal
        4520 Main Street, Suite 1100
        Kansas City, Missouri 64111
        Facsimile No.: (816) 531-7545

     6. WAIVERS AND AMENDMENTS. This Agreement may be amended, superseded,
canceled, renewed or extended, and the terms hereof may be waived with respect
to a party, only by a written instrument duly executed and acknowledged with the
same formality as this Agreement, and signed by the person waiving such right.
Delay on the part of any party to exercise any right, power or privilege
hereunder shall not operate as a waiver thereof, nor shall any waiver on the
part of any party of any such right, power or privilege, nor any single or
partial exercise of any such right, power or privilege, preclude any further
exercise thereof or the exercise of any other such right, power or privilege.

     7. WITHHOLDING TAX. If the Company is required to withhold taxes upon
transfer of the Shares, the Company may condition such transfer upon receipt
from the Purchaser of an amount equal to all applicable federal, state and local
withholding taxes, which amount shall be determined in the Company's sole
discretion.

     8. GOVERNING LAW. This Agreement shall be governed by and construed and
enforced in accordance with the laws of the State of Kansas.

     IN WITNESS WHEREOF, this Agreement is deemed made as of the date first set
forth above.

                                        AIRPORT SYSTEMS INTERNATIONAL, INC.

                                        By:
                                           ------------------------------------
                                        Name:         Keith S. Cowan
                                        Title:        President


                                      5

<PAGE>   20


                                         "PURCHASER"

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


                                         PURCHASER'S RESIDENCE ADDRESS

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


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







                                      6