| 3301 | GLS | GLS Bau und Montagne GmbH | | AT | VKM |
| 3302 | GLSB | GOOLSBY TRUCKING CO INC | | | SCAC4 |
| 3303 | GLSE | GLS TRANSPORT INC | | | SCAC4 |
| 3304 | GLSF | GUILLEN ESTRADA, ARNOLFO | | | SCAC4 |
| 3305 | GLSF | Gray Line San Francisco | | USA | TRAFFIC |
| 3306 | GLSI | GREAT LUCK SHIPPING INC | | | SCAC4 |
| 3307 | GLSM | GERALDO'S AT LASALLE PARK | | | SCAC4 |
| 3308 | GLSN | GOSSETTE LIMOUSINE SERVICE INC | | | SCAC4 |
| 3309 | GLSQ | GEIST, L S INC | | | SCAC4 |
| 3310 | GLSR | Gloster Southern R.R. Co. | added 10/1986; 1/1994-7/2005 | | NAKINA |
| 3311 | GLSR | Gloster Southern R.R. Co. | added 10/86; 1/94-7/2000 | | NRHS |
| 3312 | GLSR | GLOSTER SOUTHERN RAILROAD | | | PWRC |
| 3313 | GLSR | Gloster Southern Railroad | | | RSRV |
| 3314 | GLSS | GLASS, R J INC | | | SCAC4 |
| 3315 | GLST | GLOBAL LOGISTICS SERVICES INC | | | SCAC4 |
| 3316 | GLSU | GLOBAL SECURE SHIPPING, INC. | | USA | BIC |
| 3317 | GLSW | GLASGOW TRUCKING INC | | | SCAC4 |
| 3318 | GLSX | Glacier State Distribution Services, Inc. | added 1/1996; eliminated 4/2000; 7/2000-7/2005 (not listed) | | NAKINA |
| 3319 | GLSX | Great Lakes Steel Division, National Steel Corp. | added 10/1966; 10/1966-4/1970; eliminated 10/1971 | | NAKINA |
| 3320 | GLSX | Great Lakes Steel Corp., Division of National Steel Corp. | added 1/1966; eliminated 10/1966 | | NAKINA |
| 3321 | GLSX | Great Lakes Steel Corp. | 7/1930-7/1937; 1/1941-4/1947 (not listed); 1/1950-4/1961; eliminated 10/1964 | | NAKINA |
| 3322 | GLSX | Great Lakes Steel Corp. | 1/52-4/61 | | NRHS |
| 3323 | GLSX | Great Lakes Steel Corp., Division of National Steel Corp. | added 1/66; eliminated 10/66 | | NRHS |
| 3324 | GLSX | Great Lakes Steel Division, National Steel Corp. | added 10/66; 10/66-4/70; eliminated 10/71 | | NRHS |
| 3325 | GLSX | Glacier State Distribution Services, Inc. | added 1/96; eliminated 4/2000; 7/2000 | | NRHS |
| 3326 | GLSX | *GREAT LAKES STEEL CORP., DIV. NATIONAL STEEL CORP. | | | PWRC |
| 3327 | GLSX | +GLACIER STATE DISTRIBUTION SERVICES INC. | | | PWRC |
| 3328 | GLSX | Glacier State Distribution Services | | | RSRV |
| 3329 | GLSX | GLACIER STATE DISTRIBUTION SERVICES | | | SCAC4 |
| 3330 | GLSZ | GLOBAL STONE | | | PWRC |
| 3331 | GLT | Galata Aviacharter Ltd. | Callsign: Galata Charter, | MD | AVCODES |
| 3332 | GLT | Aero Charter, Inc. | Callsign: Gaslight, | USA | AVCODES |
| 3333 | GLT | Aero Charter | | | ICAO1 |
| 3334 | GLT | Göteborgsregionens Lokaltrafik | | S | TRAFFIC |
| 3335 | GLTB | GLT | | | SCAC4 |
| 3336 | GLTD | GREAT LAKES TRUCKING | | | SCAC4 |
| 3337 | GLTJ | GLT TRUCKING INC | | | SCAC4 |
| 3338 | GLTK | GLASS TI LLC | | | SCAC4 |
| 3339 | GLTL | GLENWOOD TRANSIT LINE, INC | | | SCAC1 |
| 3340 | GLTL | GLENWOOD TRANSIT LINE, INC | | | SCAC4 |
| 3341 | GLTN | GALE/TRIANGLE INC | | | SCAC4 |
| 3342 | GLTP | GRAND LINX TRANSPORTATION LTD | | | SCAC4 |
| 3343 | GLTS | GENERAL TRANSPORT COMPANY | | | SCAC4 |
| 3344 | GLTU | GLT TRADING LLC | | USA | BIC |
| 3345 | GLTX | PH GLATFELTER COMPANY | | | SCAC4 |
| 3346 | GLTY | G-LINE TRUCKING | | | SCAC4 |
| 3347 | GLU | Great Lakes Airways (U) Ltd. | Callsign: Lakes Cargo, | EAU | AVCODES |
| 3348 | GLU | Great Lakes Airways (Uganda) | | | ICAO1 |
| 3349 | GLUI | GLOBAL LOGISTICS UNLIMITED INC | | | SCAC4 |
| 3350 | GLUL | GLOBAL VAN LINES, INC | | | SCAC1 |
| 3351 | GLUL | GLOBAL VAN LINES INC | | | SCAC4 |
| 3352 | GLUS | GLUSKA, LEONARD | | | SCAC4 |
| 3353 | GLUT | GLOBAL ULTIMATE TRANSPORTATION INC | | | SCAC4 |
| 3354 | GLUU | GLOBELINK UNIMAR LOJISTIK A.S. | | TR | BIC |
| 3355 | GLUV | G & L COURIER | | | SCAC4 |
| 3356 | GLV | Global Avanti | Callsign: Avanti, | YV | AVCODES |
| 3357 | GLV | Gesellschaft für Logistik und Vegetationsdienste mbH | Ludwigshafen | D | privat-bahn.de |
| 3358 | GLV | Gesellschaft für Logistik und Vegetationsdienste mbH | | DE | VKM |
| 3359 | GLVC | GLOVER CO LTD | | | SCAC4 |
| 3360 | GLVJ | GLOVER TRUCKING | | | SCAC4 |
| 3361 | GLVL | GROUND LEVEL TRANSPORT INC | | | SCAC4 |
| 3362 | GLVO | GRUPO LARA VILLALOBOS | | | SCAC4 |
| 3363 | GLVQ | GREAT LAKES SERVICE II INC | | | SCAC4 |
| 3364 | GLVR | GLOVER TRUCKING INC | | | SCAC4 |
| 3365 | GLVX | Marion Plywood Corp. | added 10/2003; eliminated 1/2004; 7/2005 (not listed) | | NAKINA |
| 3366 | GLVX | MARION PLYWOOD CORP. | | | PWRC |
| 3367 | GLVX | MARION PLYWOOD CORPORATION | | | SCAC4 |
| 3368 | GLW | Execujet Scandinavia A/S | ICAO Designator changed to EJS | DK | AVCODES |
| 3369 | GLW | Global Wings | | | ICAO1 |
| 3370 | GLWA | GLC FURNITURE WAREHOUSE INC | | | SCAC4 |
| 3371 | GLWD | GLENWOOD KITCHEN LTD | | | SCAC4 |
| 3372 | GLWF | GREYLAWN FOODS INC | | | SCAC4 |
| 3373 | GLWG | G L W GROUP LLC | | | SCAC4 |
| 3374 | GLWH | GALLOD WELSH | | | SCAC4 |
| 3375 | GLWI | GREAT LAKES WESTERN INC | | | SCAC4 |
| 3376 | GLWK | GREAT LAKES WIND NETWORK WIRE NET | | | SCAC4 |
| 3377 | GLWN | GLADWIN HOLDINGS INC | | | SCAC4 |
| 3378 | GLWT | GALBRAITH, W T | | | SCAC4 |
| 3379 | GLWW | GREAT LAKES WILD WOODLAND GINSENG L | | | SCAC4 |
| 3380 | GLX | Galaxy Airways | IATA: 9G, Callsign: Galaxy Air, Ceased operations | GR | AVCODES |
| 3381 | GLX | Gelix Airlines | Callsign: Russian Bird, | RUS | AVCODES |
| 3382 | GLX | Goodman Lumber Co. | 7/1937-4/1938 (not listed) | | NAKINA |
| 3383 | GLX | GOODMAN LUMBER CO. | | | PWRC |
| 3384 | GLX | Galaxy Airlines | Real: GXY, J7 | J | TRAFFIC |
| 3385 | GLXA | GLOBALEX LLC | | | SCAC4 |
| 3386 | GLXB | GREAT LOGISTICS INC | | | SCAC4 |
| 3387 | GLXF | GILL TRANSPORT | | | SCAC4 |
| 3388 | GLXH | GLORY EXPRESS INC | | | SCAC4 |
| 3389 | GLXI | GALAXY INTERMODAL INC | | | SCAC4 |
| 3390 | GLXJ | G L TRANSPORT LLC | | | SCAC4 |
| 3391 | GLXL | GRAND LINX LOGISTICS INC | | | SCAC4 |
| 3392 | GLXN | GREEN LINE EXPRESS INC | | | SCAC4 |
| 3393 | GLXO | G & L TRANSPORT | | | SCAC4 |
| 3394 | GLXQ | GLADIATOR LOGISTICS INC | | | SCAC4 |
| 3395 | GLXR | GALAXY TRANSPORT INC | | | SCAC4 |
| 3396 | GLXU | GLOBAL LOGISTICS SOLUTIONS INDIA PVT LTD | | IND | BIC |
| 3397 | GLXY | GALAXY TRANSPORTATION SERVICES | | | SCAC4 |
| 3398 | GLY | Galaxy Aviation (Pvt) Ltd | Callsign: Galaxy Aviation, | PK | AVCODES |
| 3399 | GLYC | GALLERY 41 INC | | | SCAC4 |
| 3400 | GLYG | GOD LOVES YOU TRUCKING | | | SCAC4 |
