| 1 | AUA | Austrian Airlines | IATA: OS, Callsign: Austrian, IATA Prefix: 257, Name changed to Austrian Airlines, Osterreichische Luftverkehrs AG d/b/a/ Austrian | A | AVCODES |
| 2 | AUA | Austrian Airlines, Osterreichische Luftverkehrs AG d/b/a/ Austrian | IATA: OS, Callsign: Austrian, IATA Prefix: 257, Name changed to Austrian Airlines AG d/b/a/ Austrian. Name changed from Austrian Airlines | A | AVCODES |
| 3 | AUA | Austrian Airlines AG d/b/a/ Austrian | IATA: OS, Callsign: Austrian, IATA Prefix: 257, Name changed from Austrian Airlines, Osterreichische Luftverkehrs AG d/b/a/ Austrian | A | AVCODES |
| 4 | AUA | Austrian Airlines | IATA: OS | | ICAO1 |
| 5 | AUA | Austrian Airlines | | A | TRAFFIC |
| 6 | AUAA | AUSTIN, A A TRUCKING | | | SCAC4 |
| 7 | AUAB | AROUND AND ABOUT TOURS | | | SCAC3 |
| 8 | AUAB | AUGEN OPTICOS S A DE C V | | | SCAC4 |
| 9 | AUAC | AUTO AIR CARGO COMPANY | | | SCAC4 |
| 10 | AUAD | AURORA DISTRIBUTING CO INC | | | SCAC3 |
| 11 | AUAE | AURORA AREA EXPRESS, INC | | | SCAC3 |
| 12 | AUAE | AURORA AREA EXPRESS INC | | | SCAC4 |
| 13 | AUAF | AUTOMATIC AIR FREIGHT | | | SCAC3 |
| 14 | AUAG | AUTOCON OF ATLANTA INC | | | SCAC3 |
| 15 | AUAG | AULT TRUCKING | | | SCAC4 |
| 16 | AUAH | AUTO SALVAGE AUCTION INC | | | SCAC4 |
| 17 | AUAI | AUSTIN, CHARLES LTD | | | SCAC4 |
| 18 | AUAO | AAA UNITED AUTO TRANSPORT | | | SCAC4 |
| 19 | AUAP | ACURA TRANSPORTATION | | | SCAC3 |
| 20 | AUAR | AUSTIN AREA TERMINAL RAILROAD | | | PWRC |
| 21 | AUAR | Austin Area Terminal Railroad | | | RSRV |
| 22 | AUAR | Austin Area Terminal Railroad | | USA | TRAFFIC |
| 23 | AUAS | ACU TRANSPORT CO LTD | | | SCAC4 |
| 24 | AUAT | AUGUSTA TRUCKING COMPANY | | | SCAC3 |
| 25 | AUAW | AAA TRAVEL AGENCY | | | SCAC3 |
