The U.S. aircraft register, updated daily
Who holds what · as the FAA records the name

Sioux Aircraft Corporation

Holds 4 type certificates (4 models). FAA spelling: Sioux Aircraft Corporation.

Type certificates 4

ATC 414Aircraft · Coupe 90-B
ATC 331Aircraft · Coupe 90
TC 2-356Aircraft · Coupe 90-C
TC 2-81Aircraft · Coupe 60

Source: FAA Dynamic Regulatory System (type certificate data sheets, supplemental type certificates, technical standard order authorisations). An organisation's name is as the FAA spelled it on each record; related spellings are separate pages.