| 401 | GARV | GARCIA ALMAGUER, ANTONIO | | | SCAC4 |
| 402 | GARX | GATX de Mexico Inc. | added 7/2007 | | NAKINA |
| 403 | GARX | GATX de Mexico SA de CV | added 1/2003; 7/2005; eliminated 7/2007 | | NAKINA |
| 404 | GARX | General American Marks Co. | added 1/1998; 7/2000 | | NAKINA |
| 405 | GARX | General American Transportation Corp. | 4/1938-1/1994; eliminated 1/1998 | | NAKINA |
| 406 | GARX | General American Refrigerator Express Co. (General American Transportation Corp.) | added 11/1934; 7/1935-7/1937 | | NAKINA |
| 407 | GARX | General American Refining Co. | 8/1920 | | NAKINA |
| 408 | GARX | General American Refrigerator Express Co. (General American Transportation Corp.) | 4/38-10/66 | | NRHS |
| 409 | GARX | General American Transportation Corp. | 4/70-1/94; eliminated 1/98 | | NRHS |
| 410 | GARX | General American Marks Co. | added 1/98; 7/2000 | | NRHS |
| 411 | GARX | *GENERAL AMERICAN REFINING | | | PWRC |
| 412 | GARX | +GATX DE MEXICO SA DE CV [GENERAL AMERICAN MARKS CO.; GENERAL AMERICAN TRANSPORTATION CORP.; GENERAL AMERICAN REFRIGERATOR EXPRESS] | | | PWRC |
| 413 | GARX | General American Transportation Corporation (GATX de Mexico de CV) | | | RSRV |
| 414 | GARX | GATX DE MEXICO INC | | | SCAC4 |
| 415 | GARX | General American Refrigerator Express Co. (General American Transportation Corp.) | | USA | TRAFFIC |
| 416 | GAS | Galena Air Service | Callsign: Galena Air Serivce, | USA | AVCODES |
| 417 | GAS | Galena Air Service | | | ICAO1 |
| 418 | GASC | GEORGIA, ASHBURN, SYLVESTER & CAMILLA RAILROAD | | | PWRC |
| 419 | GASC | Georgia, Ashburn, Sylvester & Camilla Railroad | | | RSRV |
| 420 | GASC | GASCHO TRUCKING INC | | | SCAC4 |
| 421 | GASE | G A S ENTERPRISES LTD | | | SCAC4 |
| 422 | GASH | GATE SHIPHOLDING SA | | | SCAC4 |
| 423 | GASI | GARCEAUS AUTO SALES INC | | | SCAC4 |
| 424 | GASJ | GUERRA AUTO SALES | | | SCAC4 |
| 425 | GASP | GALAN SHIPPING LIMITED | | | SCAC4 |
| 426 | GAST | GASTELUM CAMPOY, OSCAR DANIEL | | | SCAC4 |
| 427 | GASU | BULKHAUL LTD | | GB | BIC |
| 428 | GASU | BULKHAUL (UK) LTD | | | SCAC4 |
| 429 | GASV | GOBEL AG SERVICE | | | SCAC4 |
| 430 | GASW | GAS TWENTY TWO (22) LLC | | | SCAC4 |
| 431 | GASX | General American Marks Co. | added 1/1998; 7/2000-7/2005 | | NAKINA |
| 432 | GASX | General American Transportation Corp. | 1/1943-4/1961; eliminated 10/1962; added 4/1970; 4/1970-1/1994; eliminated 1/1998 | | NAKINA |
| 433 | GASX | Gasoline Corp. | 8/1920 | | NAKINA |
| 434 | GASX | General American Transportation Corp. | 1/52-4/61; added 4/70; 4/70-1/94; eliminated 1/98 | | NRHS |
| 435 | GASX | General American Marks Co. | added 1/98; 7/2000 | | NRHS |
| 436 | GASX | *GASOLINE CORP. | | | PWRC |
| 437 | GASX | +GENERAL AMERICAN MARKS COMPANY [GENERAL AMERICAN STOCK EXPRESS] | | | PWRC |
| 438 | GASX | General American Marks (GATX Corporation) | | | RSRV |
| 439 | GASY | GA MASONRY | | | SCAC4 |
| 440 | GASZ | PARGAS, INC. | | | PWRC |
| 441 | GAT | Gulf Air, Inc. | Callsign: Gulf Trans, Name changed from Gulf Air Transport, Inc. | USA | AVCODES |
| 442 | GAT | Gulf Air Transport, Inc. | Callsign: Gulf Trans, Name changed to Gulf Air, Inc. | USA | AVCODES |
| 443 | GAT | Gulf Air Inc | | | ICAO1 |
| 444 | GATB | GULF AMERICAN TRANSPORTATION | | | SCAC4 |
| 445 | GATC | GATEWAY TRANSPORTATION CO | | | PWRC |
| 446 | GATC | GOLDEN ANGEL TRUCKING INC, THE | | | SCAC4 |
| 447 | GATD | GRANIT DESIGN | | | SCAC4 |
| 448 | GATE | GATEWAY CARTAGE LLC | | | SCAC4 |
| 449 | GATF | GATOR FREIGHTWAYS, INC | | | SCAC1 |
| 450 | GATF | GATOR FREIGHTWAYS INC | | | SCAC4 |
| 451 | GATH | G & A TRUCKING | | | SCAC4 |
| 452 | GATI | GARDNER TRUCKING INC | | | SCAC4 |
| 453 | GATJ | GATH, JAMES TRUCKING INC | | | SCAC4 |
| 454 | GATK | GREAT AMERICAN TRANSPORT LLC | | | SCAC4 |
| 455 | GATR | GOLDEN ARROW TRUCKING | | | SCAC4 |
| 456 | GATS | GATES, RODNEY B | | | SCAC4 |
| 457 | GATT | GATTSLED | | | SCAC4 |
| 458 | GATU | TEXTAINER EQUIPMENT MANAGEMENT LTD | | BM | BIC |
| 459 | GATU | GATEWAY CONTAINER LEASING (GENERAL AMERICAN MARKS COMPANY) | | | PWRC |
| 460 | GATU | Gateway Container Leasing | | | RSRV |
| 461 | GATU | GATEWAY MANAGEMENT SERVICES LIMITED | | | SCAC4 |
| 462 | GATX | General American Marks Co. | added 1/1998; 7/2000-7/2005 | | NAKINA |
| 463 | GATX | General American Transportation Corp. | 4/1938-1/1980; added 7/1984; 1/1994; eliminated 1/1998 | | NAKINA |
| 464 | GATX | General American Tank Line (General American Transportation Corp.) | 7/1937 | | NAKINA |
| 465 | GATX | General American Tank Line (General American Tank Car Corp.) | 8/1920-7/1935 | | NAKINA |
| 466 | GATX | General American Tank Line (General American Transportation Corp.) | 4/38-10/66 | | NRHS |
| 467 | GATX | General American Transportation Corp. | 4/70-1/80; added 7/84; 1/94; eliminated 1/98 | | NRHS |
| 468 | GATX | General American Marks Co. | added 1/98; 7/2000 | | NRHS |
| 469 | GATX | GENERAL AMERICAN MARKS COMPANY (GATX CORP.) [GENERAL AMERICAN TANK LINE] | | | PWRC |
| 470 | GATX | GATX Corporation | | | RSRV |
| 471 | GATX | GENERAL AMERICAN MARKS COMPANY | | | SCAC4 |
| 472 | GATX | General American Tank Line (General American Transportation Corp.) | | USA | TRAFFIC |
| 473 | GATXA | GATX Rail Austria GmbH | | AT | VKM |
| 474 | GATXD | GATX Rail Germany GmbH | | DE | VKM |
| 475 | GATXO | Ing. Alica Ovčiariková A.O., s.r.o. | | SK | VKM |
| 476 | GATXP | GATX Rail Poland Sp. z o.o. | | PL | VKM |
| 477 | GATY | GARDNER TRUCKING INC (FLATBED DIVIS | | | SCAC4 |
| 478 | GAU | Aerogaucho, S.A. | Callsign: Aerogaucho, | ROU | AVCODES |
| 479 | GAU | Aerogaucho | | | ICAO1 |
| 480 | GAUB | GAUBERT OIL CO INC | | | SCAC4 |
| 481 | GAUI | GATENS ADVENTURES UNLIMITED LLC | | | SCAC4 |
| 482 | GAUP | GLOBAL AUTO PROCESSING SERVICES INC | | | SCAC4 |
| 483 | GAUT | GAUTHIER, DEAN | | | SCAC4 |
| 484 | GAUU | Gauthier On Site Storage & Gauthiers Oilfield Rent | | | RSRV |
| 485 | GAUU | GAUTHIER ON-SITE STORAGE & GAUTHIER | | | SCAC4 |
| 486 | GAUV | GAUVIN, REAL A INC | | | SCAC4 |
| 487 | GAUW | GTCL AUTOS & TOWING | | | SCAC4 |
| 488 | GAUX | General American Transportation Corp. | 1/1975-1/1980; eliminated 10/1992 | | NAKINA |
| 489 | GAUX | General American Transportation Corp., Freight Car Division | added 11/1973 | | NAKINA |
| 490 | GAUX | General American Transportation Corp., Freight Car Division | added 11/73 | | NRHS |
| 491 | GAUX | General American Transportation Corp. | 1/75-1/80; eliminated 10/92 | | NRHS |
| 492 | GAUX | RETIRED 08-19-92 ATP(1380) [GATX] | | | PWRC |
| 493 | GAUX | General American Transportation Corporation (GATX) | | | RSRV |
| 494 | GAV | Granada Aviacion | Callsign: Granavi, | E | AVCODES |
| 495 | GAV | Granada Aviacion | | | ICAO1 |
| 496 | GAVA | GAVSA | | | SCAC4 |
| 497 | GAVL | GAVEL, JOHN CUSTOM MANUFACTURING LT | | | SCAC4 |
| 498 | GAVO | GOLDEN VALLEY TRUCKING CORP | | | SCAC4 |
| 499 | GAVU | PELLEGRINI TRASPORTI SRL | | I | BIC |
| 500 | GAVU | PELLEGRINI TRASPORTI SRL | | | SCAC4 |
