| 1 | GAB | Gendall Air Ltd. | Callsign: Gendall, | CDN | AVCODES |
| 2 | GAB | Aerobell Airlines | Callsign: Cali, | CR | AVCODES |
| 3 | GAB | Gendall Air | | | ICAO1 |
| 4 | GABC | GAB TRANSPORT INC | | | SCAC4 |
| 5 | GABD | GANEM VARGAS, JUAN RAMON | | | SCAC4 |
| 6 | GABE | GABERT, JACK | | | SCAC4 |
| 7 | GABK | GASPER-ATKINSON BULK DIVISION INC | | | SCAC4 |
| 8 | GABL | GABELINE TRUCKING | | | SCAC4 |
| 9 | GABN | GAMBRINUS TRUCKING CO INC | | | SCAC4 |
| 10 | GABON | Trans-Gabon Railway | | G | TRAFFIC |
| 11 | GABS | GABELINE, W T & SONS LLC | | | SCAC4 |
| 12 | GABU | GABO GAS 2 SAS DI GALVA GNI EVALTIE | | | SCAC4 |
| 13 | GABW | Go-ahead Baden-Württemberg GmbH | | D | TRAFFIC |
| 14 | GABX | General American Marks Co. | 7/2000-7/2005 | | NAKINA |
| 15 | GABX | General American Transportation Corp. | 1/1946-4/1961; eliminated 10/1962 | | NAKINA |
| 16 | GABX | General American Transportation Corp. —temporary expiring 30June1941 | 1/1941 | | NAKINA |
| 17 | GABX | General American Transportation Corp. | 1/52-4/61 | | NRHS |
| 18 | GABX | General American Marks Co. | Jul-00 | | NRHS |
| 19 | GABX | GENERAL AMERICAN MARKS COMPANY | | | PWRC |
| 20 | GABX | General American Marks (GATX Corporation) | | | RSRV |
| 21 | GABX | GENERAL AMERICAN MARKS COMPANY | | | SCAC4 |
| 22 | GABY | GABY VENTURES LTD | | | SCAC4 |
