Exhibit 21

Subsidiaries

Avcon Industries, Inc., a Kansas Corporation

Butler National Services, Inc., a Florida Corporation

BCS Design, Inc., a Kansas Corporation

Butler National, Inc., a Nevada Corporation

Butler Temporary Services, Inc., a Missouri Corporation

Butler National Corporation, a Nebraska Corporation

Kansas International Inc., a Kansas Corporation

Butler National Service Corporation, a Kansas Corporation

AVT Corporation, a Texas Corporation

Indian Gaming Corporation, a Kansas Corporation