<PAGE>   1

                                                                      EXHIBIT 21


                       AIRPORT SYSTEMS INTERNATIONAL, INC.
                           SUBSIDIARIES OF THE COMPANY


<TABLE>
<CAPTION>
Subsidiary                                   Jurisdiction
-----------------------------------------------------------

<S>                                          <C>
DCI, Inc.                                    U.S.A.

ASII International, Inc.                     Barbados, W.I.
</TABLE>


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