| 1 | GAU | Aerogaucho, S.A. | Callsign: Aerogaucho, | ROU | AVCODES |
| 2 | GAU | Aerogaucho | | | ICAO1 |
| 3 | GAUB | GAUBERT OIL CO INC | | | SCAC4 |
| 4 | GAUI | GATENS ADVENTURES UNLIMITED LLC | | | SCAC4 |
| 5 | GAUP | GLOBAL AUTO PROCESSING SERVICES INC | | | SCAC4 |
| 6 | GAUT | GAUTHIER, DEAN | | | SCAC4 |
| 7 | GAUU | Gauthier On Site Storage & Gauthiers Oilfield Rent | | | RSRV |
| 8 | GAUU | GAUTHIER ON-SITE STORAGE & GAUTHIER | | | SCAC4 |
| 9 | GAUV | GAUVIN, REAL A INC | | | SCAC4 |
| 10 | GAUW | GTCL AUTOS & TOWING | | | SCAC4 |
| 11 | GAUX | General American Transportation Corp. | 1/1975-1/1980; eliminated 10/1992 | | NAKINA |
| 12 | GAUX | General American Transportation Corp., Freight Car Division | added 11/1973 | | NAKINA |
| 13 | GAUX | General American Transportation Corp., Freight Car Division | added 11/73 | | NRHS |
| 14 | GAUX | General American Transportation Corp. | 1/75-1/80; eliminated 10/92 | | NRHS |
| 15 | GAUX | RETIRED 08-19-92 ATP(1380) [GATX] | | | PWRC |
| 16 | GAUX | General American Transportation Corporation (GATX) | | | RSRV |