| 301 | GAMO | GRAEBEL AMERICAN MOVERS INC | | | SCAC4 |
| 302 | GAMQ | GRAEBEL ATLANTA MOVERS INC | | | SCAC4 |
| 303 | GAMR | GAMRADT, LYLE INC | | | SCAC4 |
| 304 | GAMS | GRAND AMERICAN ROAD RACING | | | SCAC4 |
| 305 | GAMU | STOLPI GAMAR EHF | | IS | BIC |
| 306 | GAMU | JONAR SF | | | SCAC4 |
| 307 | GAMX | Arrendadora Nacional de Carros de Ferrocarril, S.A. de C.V. | added 4/1991; 1/1994-7/2005 | | NAKINA |
| 308 | GAMX | Arrendadora Nacional de Carros de Ferrocarril, S.A. | added 4/1987; eliminated 4/1991 | | NAKINA |
| 309 | GAMX | General American de Mexico | 4/1970-1/1980; eliminated 4/1987 | | NAKINA |
| 310 | GAMX | General American de Mexico, S.A. | 4/1961-10/1966 | | NAKINA |
| 311 | GAMX | General American de Mexico, S.A. | added 10/1954; 10/1957 | | NAKINA |
| 312 | GAMX | General American Transportation de Mexico, S.A. | 1/1950-7/1954; eliminated 10/1954 | | NAKINA |
| 313 | GAMX | General American Transportation de Mexico, S.A. | 1/52-10/57 | | NRHS |
| 314 | GAMX | General American de Mexico, S.A. | 4/61-10/66 | | NRHS |
| 315 | GAMX | General American de Mexico | 4/70-1/80; eliminated 4/87 | | NRHS |
| 316 | GAMX | Arrendadora Nacional de Carros de Ferrocarril, S.A. | added 4/87; eliminated 4/91 | | NRHS |
| 317 | GAMX | Arrendadora Nacional de Carros de Ferrocarril, S.A. de C.V. | added 4/91; 1/94-7/2000 | | NRHS |
| 318 | GAMX | GENERAL AMERICAN DE MEXICO (ARRENDADORA NACIONAL DE CARROS DE FERROCARRIL, SA) | | | PWRC |
| 319 | GAMX | General American de Mexico (Arrendadora Nacional De Carros De Ferrocaril) | | | RSRV |
| 320 | GAMX | ARRENDADORA NACIONAL DE CARROS DE F | | | SCAC4 |
| 321 | GAMZ | GARDINIER MINE | | | PWRC |
| 322 | GAN | Gander Aviation Ltd. | Callsign: Ganair, | CDN | AVCODES |
| 323 | GAN | Gander Aviation | | | ICAO1 |
| 324 | GANA | GANDOLA TRUCKING | | | SCAC1 |
| 325 | GANA | GANDOLA TRUCKING | | | SCAC4 |
| 326 | GANC | GANN CAR CRUSHING INC | | | SCAC4 |
| 327 | GAND | GANDER, J V DISTRIBUTORS INC | | | SCAC4 |
| 328 | GANE | GARZA, ANGEL | | | SCAC4 |
| 329 | GANG | GANGLOFF & DOWNHAM TRUCKING CO INC | | | SCAC4 |
| 330 | GANH | GANNET SHIPPING B V | | | SCAC4 |
| 331 | GANJ | GA LINES INC | | | SCAC4 |
| 332 | GANL | GANGLOFF INDUSTRIES INC | | | SCAC4 |
| 333 | GANM | GASTELUM ARMENTA, MARIA | | | SCAC4 |
| 334 | GANO | The Georgia Northern Ry. Co. | 1/1975-7/2005 | | NAKINA |
| 335 | GANO | The Georgia Northern Ry. Co. | 1/75-7/2000 | | NRHS |
| 336 | GANO | NORFOLK SOUTHERN [SOUTHERN] [GEORGIA NORTHERN RY.] | | | PWRC |
| 337 | GANO | Georgia Northern Railway | | | RSRV |
| 338 | GANO | Go Ahead Nordic - ST - Sortoget | In 2018 the British company Go Ahead won the tender to operate passenger trains in Southwestern Norway from December 2019 for 8 years, with a possible extension of another two years. Long distance trains are operated between Oslo and Stavanger (Sorlandsbanen) and regional trains on Nelaug-Arendal (Arendalsbanen) and Stavanger-Egersund (Jaerbanen). The trainsets - owned by Norske Tog and currently used on the same lines by NSB - got or will get refreshed interiors. | N | TRAFFIC |
| 339 | GANP | GANS TRANSPORT B V | | | SCAC4 |
| 340 | GANU | G. GLOBAL GASES AND CHEMICAL PLC | | ETH | BIC |
| 341 | GANU | GANGES LINES | | | SCAC4 |
| 342 | GANW | GANZ | | | SCAC4 |
| 343 | GANZ | Ganz-MÁVAG | | H | TRAFFIC |
| 344 | GAO | Golden Air Flyg AB | IATA: DC, Callsign: Golden, Name changed to Braathens Regional AB. ICAO desigantor changed from GJZ | S | AVCODES |
| 345 | GAO | Golden Air | IATA: DC | | ICAO1 |
| 346 | GAO | Golden Air | | S | TRAFFIC |
| 347 | GAOC | GAS AND OIL TUBULAR TRANSPORT CORP | | | SCAC4 |
| 348 | GAOG | GANONG TRUCKING INC | | | SCAC4 |
| 349 | GAOK | GAIO TRUCKING INC | | | SCAC4 |
| 350 | GAOT | GALASSO TRUCKING SERVICE, INC | | | SCAC1 |
| 351 | GAOU | SEACUBE CONTAINERS LLC | | USA | BIC |
| 352 | GAOU | SEVEN (7) E CONTINENT | | | SCAC4 |
| 353 | GAOX | General American Transportation Corp. | added 4/1958; 4/1961-1/1980; eliminated 10/1992 | | NAKINA |
| 354 | GAOX | General American Transportation Corp. | 4/61-1/80; eliminated 10/92 | | NRHS |
| 355 | GAOX | (GATX) RETIRED 08-19-92 ATP (1220) [CHEMETRON CORP. - LESSEE] | | | PWRC |
| 356 | GAOX | GATX Corporation | | | RSRV |
| 357 | GAP | Air Philippines Corporation | IATA: 2P, Callsign: Orient Pacific, IATA Prefix: 211, ICAO callsign changed to Airphil Express w.e.f. 10 April 2008. Designator 2P reinstated by IATA. IATA designator changed from 3G* | RP | AVCODES |
| 358 | GAP | Air Philippines Corporation d/b/a Airphil Express | IATA: 2P, Callsign: Airphil, IATA Prefix: 211, Name changed to Air Philippines Corporation d/b/a PAL Express and Airphil Express. IATA designator changed from 3G*. ICAO callsign changed from Orient Pacific. Designator 2P reinstated by IATA. | RP | AVCODES |
| 359 | GAP | Air Philippines Corporation d/b/a PAL Express and Airphil Express | IATA: 2P, Callsign: Airphil, IATA Prefix: 211, Name changed from Air Philippines Corporation. W.e.f. 15 March 2013. IATA designator changed from 3G*. ICAO callsign changed from Orient Pacific. Designator 2P reinstated by IATA | RP | AVCODES |
| 360 | GAP | Air Philippines | IATA: 2P | | ICAO1 |
| 361 | GAP | GEORGIA POWER | | | PWRC |
| 362 | GAPB | GUTIERREZ AGUIRRE, PABLO | | | SCAC4 |
| 363 | GAPI | GEORGIA PEACH INC | | | SCAC4 |
| 364 | GAPP | GAPPA OIL CO INC | | | SCAC4 |
| 365 | GAPRO | GA PRO-CO CHEMICALS SA | | RO | VKM |
| 366 | GAPS | GULF, ATLANTIC AND PACIFIC SHIPPER SERVICES, INC | | | SCAC1 |
| 367 | GAPU | G & U LOGISTICS (S) PTE LTD | | | SCAC4 |
| 368 | GAPX | The Georgia Gulf Corp., Plaquemine Division | added 4/1985; 1/1994-7/2005 | | NAKINA |
| 369 | GAPX | Georgia-Pacific Corp., Plaquemine Division | added 1/1979; 1/1980; eliminated 4/1985 | | NAKINA |
| 370 | GAPX | Georgia-Pacific Corp. | added 10/1956; 10/1957-4/1961; eliminated 7/1961; added 4/1967; 4/1970-1/1975; eliminated 1/1979 | | NAKINA |
| 371 | GAPX | Georgia-Pacific Plywood Co. | added 4/1954; 7/1954; eliminated 10/1956 | | NAKINA |
| 372 | GAPX | Georgia-Pacific Plywood Co. | added 4/54 | | NRHS |
| 373 | GAPX | Georgia-Pacific Corp. | 10/57-4/61; added 4/67; 4/70-1/75; eliminated 1/79 | | NRHS |
| 374 | GAPX | Georgia-Pacific Corp., Plaquemine Division | added 1/79; 1/80; eliminated 4/85 | | NRHS |
| 375 | GAPX | The Georgia Gulf Corp., Plaquemine Division | added 4/85; 1/94-7/2000 | | NRHS |
| 376 | GAPX | GEORGIA GULF CORPORATION [GEORGIA PACIFIC CORP. - PLAQUEMINE DIVISION] | | | PWRC |
| 377 | GAPX | Georgia-Pacific Corporation Plaquemine Division | | | RSRV |
| 378 | GAPX | GEORGIA GULF CORPORATION - PLAQUEMI | | | SCAC4 |
| 379 | GAQ | Golfe Air Quebec Ltee. | Callsign: Golfair, | CDN | AVCODES |
| 380 | GAQ | Golfe Air Quebec | | | ICAO1 |
| 381 | GAQU | GASAL (Q.S.C) | | Q | BIC |
| 382 | GAR | Commodore Aviation | | AUS | AVCODES |
| 383 | GAR | Glory Airline | Callsign: Glory Air, | WAN | AVCODES |
| 384 | GAR | Commodore Aviation | | | ICAO1 |
| 385 | GARB | GALERIA MARBLE | | | SCAC4 |
| 386 | GARC | GARCIA, B., TRUCKING CO | | | SCAC1 |
| 387 | GARC | GARCIA, B TRUCKING | | | SCAC4 |
| 388 | GARD | GARDA CL ATLANTIC INC | | | SCAC4 |
| 389 | GARE | General American Car Co. (marks changed to GARX) | eliminated 11/1934; 7/1935 | | NAKINA |
| 390 | GARE | GENERAL AMERICAN CAR CO. (MARK CHANGED TO GARX) | | | PWRC |
| 391 | GARE | GARNETT, MIKE ENTERPRISES INC | | | SCAC4 |
| 392 | GARF | GARRISON, FRED OIL CO | | | SCAC4 |
| 393 | GARK | GARCIA TRUCKING | | | SCAC4 |
| 394 | GARM | Garmatex | | F | TRAFFIC |
| 395 | GARN | GARNSEY, PAUL & SON INC | | | SCAC4 |
| 396 | GARP | Garfield-Passaic Transit | | US-NJ | TRAFFIC |
| 397 | GARR | GUTIERREZ ARRAMBIDE, JESUS RAFAEL | | | SCAC4 |
| 398 | GART | GARCIA, ARTURO | | | SCAC4 |
| 399 | GARU | GARTNER KG - INTERNATIONALE TRANSPORTE | | A | BIC |
| 400 | GARU | GARTNER KG-INTERNATIONALE TRANSPORT | | | SCAC4 |
