| 1 | GAT | Gulf Air, Inc. | Callsign: Gulf Trans, Name changed from Gulf Air Transport, Inc. | USA | AVCODES |
| 2 | GAT | Gulf Air Transport, Inc. | Callsign: Gulf Trans, Name changed to Gulf Air, Inc. | USA | AVCODES |
| 3 | GAT | Gulf Air Inc | | | ICAO1 |
| 4 | GATB | GULF AMERICAN TRANSPORTATION | | | SCAC4 |
| 5 | GATC | GATEWAY TRANSPORTATION CO | | | PWRC |
| 6 | GATC | GOLDEN ANGEL TRUCKING INC, THE | | | SCAC4 |
| 7 | GATD | GRANIT DESIGN | | | SCAC4 |
| 8 | GATE | GATEWAY CARTAGE LLC | | | SCAC4 |
| 9 | GATF | GATOR FREIGHTWAYS, INC | | | SCAC1 |
| 10 | GATF | GATOR FREIGHTWAYS INC | | | SCAC4 |
| 11 | GATH | G & A TRUCKING | | | SCAC4 |
| 12 | GATI | GARDNER TRUCKING INC | | | SCAC4 |
| 13 | GATJ | GATH, JAMES TRUCKING INC | | | SCAC4 |
| 14 | GATK | GREAT AMERICAN TRANSPORT LLC | | | SCAC4 |
| 15 | GATR | GOLDEN ARROW TRUCKING | | | SCAC4 |
| 16 | GATS | GATES, RODNEY B | | | SCAC4 |
| 17 | GATT | GATTSLED | | | SCAC4 |
| 18 | GATU | TEXTAINER EQUIPMENT MANAGEMENT LTD | | BM | BIC |
| 19 | GATU | GATEWAY CONTAINER LEASING (GENERAL AMERICAN MARKS COMPANY) | | | PWRC |
| 20 | GATU | Gateway Container Leasing | | | RSRV |
| 21 | GATU | GATEWAY MANAGEMENT SERVICES LIMITED | | | SCAC4 |
| 22 | GATX | General American Marks Co. | added 1/1998; 7/2000-7/2005 | | NAKINA |
| 23 | GATX | General American Transportation Corp. | 4/1938-1/1980; added 7/1984; 1/1994; eliminated 1/1998 | | NAKINA |
| 24 | GATX | General American Tank Line (General American Transportation Corp.) | 7/1937 | | NAKINA |
| 25 | GATX | General American Tank Line (General American Tank Car Corp.) | 8/1920-7/1935 | | NAKINA |
| 26 | GATX | General American Tank Line (General American Transportation Corp.) | 4/38-10/66 | | NRHS |
| 27 | GATX | General American Transportation Corp. | 4/70-1/80; added 7/84; 1/94; eliminated 1/98 | | NRHS |
| 28 | GATX | General American Marks Co. | added 1/98; 7/2000 | | NRHS |
| 29 | GATX | GENERAL AMERICAN MARKS COMPANY (GATX CORP.) [GENERAL AMERICAN TANK LINE] | | | PWRC |
| 30 | GATX | GATX Corporation | | | RSRV |
| 31 | GATX | GENERAL AMERICAN MARKS COMPANY | | | SCAC4 |
| 32 | GATX | General American Tank Line (General American Transportation Corp.) | | USA | TRAFFIC |
| 33 | GATXA | GATX Rail Austria GmbH | | AT | VKM |
| 34 | GATXD | GATX Rail Germany GmbH | | DE | VKM |
| 35 | GATXO | Ing. Alica Ovčiariková A.O., s.r.o. | | SK | VKM |
| 36 | GATXP | GATX Rail Poland Sp. z o.o. | | PL | VKM |
| 37 | GATY | GARDNER TRUCKING INC (FLATBED DIVIS | | | SCAC4 |
