| 1201 | GCTD | GARICK CORPORATION, THE | | | SCAC4 |
| 1202 | GCTG | GARDEN CITY GROWERS | | | SCAC4 |
| 1203 | GCTH | GULF COAST TANK LINES LLC | | | SCAC4 |
| 1204 | GCTL | GCT | | | SCAC4 |
| 1205 | GCTM | GULF COAST CHAPTER-NRHS | | | PWRC |
| 1206 | GCTN | GREAT CENTRAL TRANSPORT INC | | | SCAC4 |
| 1207 | GCTO | GARCIA TRANSPORT COMPANY, Eastern Oregon Fast Freight, INC | | | SCAC1 |
| 1208 | GCTS | GULFCOAST TRANSPORTATION SYSTEMS IN | | | SCAC4 |
| 1209 | GCTU | GULF CONTAINER LINES | | | PWRC |
| 1210 | GCTU | Gulf Container Lines | | | RSRV |
| 1211 | GCTU | GULF CONTAINER LINES | | | SCAC4 |
| 1212 | GCTW | GREEN CITY TRUCKING LTD | | | SCAC4 |
| 1213 | GCTX | General Chemical Corp. | added 7/1987; 1/1994-7/2005 | | NAKINA |
| 1214 | GCTX | General Chemical Corp. | added 7/87; 1/94-7/2000 | | NRHS |
| 1215 | GCTX | GENERAL CHEMICAL CORPORATION | | | PWRC |
| 1216 | GCTX | General Chemical Corporation | | | RSRV |
| 1217 | GCTX | GENERAL CHEMICAL CORPORATION | | | SCAC4 |
| 1218 | GCUK | GC TRUCKING | | | SCAC4 |
| 1219 | GCUT | GOVERNING COUNCIL UNIVERSITY OF TOR | | | SCAC4 |
| 1220 | GCUU | NOBLE CONTAINER LEASING SINGAPORE PTE LTD | | SGP | BIC |
| 1221 | GCUU | GLOBAL CONTAINER RENTAL PTD LTD | | | SCAC4 |
| 1222 | GCV | G-1 RT | Callsign: Gee-Bird, | H | AVCODES |
| 1223 | GCVA | GIANG, C TRUCKING | | | SCAC4 |
| 1224 | GCVC | GROUND COVER SERVICES | | | SCAC4 |
| 1225 | GCVD | GAME CREEK VIDEO | | | SCAC4 |
| 1226 | GCVL | GOOD CENTS SERVICES LLC | | | SCAC4 |
| 1227 | GCVS | GONZALEZ CUEVAS, FRANCISCO | | | SCAC4 |
| 1228 | GCVT | GULF COAST VAN & STORAGE | | | SCAC4 |
| 1229 | GCW | Global Air Crew A/S | Callsign: Globalcrew, Name changed to FlyGAC A/S. | DK | AVCODES |
| 1230 | GCW | flyGAC A/S | Callsign: Globalcrew, Name changed from Global Air Crew A/S. | DK | AVCODES |
| 1231 | GCW | Garden City Western Ry. Co. | 7/1923-1/1980; eliminated 7/1986; eliminated 7/1989; 1/1994-7/2005 | | NAKINA |
| 1232 | GCW | Garden City Western Ry. Co. | 4/38-1/80; eliminated 7/86; eliminated 7/89; 1/94-7/2000 | | NRHS |
| 1233 | GCW | GARDEN CITY WESTERN RAILWAY COMPANY | | | PWRC |
| 1234 | GCW | Garden City Western Railway | | | RSRV |
| 1235 | GCWD | GENERAL COMMODITIES WAREHOUSE&DISTRIBUTING COMPANY, L.P | | | SCAC1 |
| 1236 | GCWE | G C W EXPRESS | | | SCAC4 |
| 1237 | GCWF | GRYSIUK, CALVIN W F | | | SCAC4 |
| 1238 | GCWG | GRACE TWO (2) GRACE TOWING | | | SCAC4 |
| 1239 | GCX | Honeywell International, Inc. | added 7/2000; 7/2000-7/2005 | | NAKINA |
| 1240 | GCX | AlliedSignal Inc. | added 1/1999; eliminated 7/2000 | | NAKINA |
| 1241 | GCX | Alltank Equipment Corp. | added 10/1972; 1/1975-1/1994; eliminated 7/1995; eliminated 1/1999 | | NAKINA |
| 1242 | GCX | Allied Chemical Corp. | added 1/1967; 4/1970; eliminated 10/1972 | | NAKINA |
| 1243 | GCX | General Chemical Division, Allied Chemical Corp. | 10/1966; eliminated 1/1967 | | NAKINA |
| 1244 | GCX | First Union Properties, Inc. | 7/1965 | | NAKINA |
| 1245 | GCX | General Chemical Division Allied Chemical Corp. | added 7/1958; 4/1961 | | NAKINA |
| 1246 | GCX | General Chemical Co. | 8/1920-4/1947 | | NAKINA |
| 1247 | GCX | General Chemical Division Allied Chemical & Dye Corp. | 1/1950-10/1957; eliminated 7/1958 | | NAKINA |
| 1248 | GCX | General Chemical Co. | Apr-38 | | NRHS |
| 1249 | GCX | General Chemical Division Allied Chemical & Dye Corp. | 1/52-10/57; eliminated 7/58 | | NRHS |
| 1250 | GCX | General Chemical Division Allied Chemical Corp. | added 7/58; 4/61 | | NRHS |
| 1251 | GCX | First Union Properties, Inc. | Jul-65 | | NRHS |
| 1252 | GCX | General Chemical Division, Allied Chemical Corp. | 10/66; eliminated 1/67 | | NRHS |
| 1253 | GCX | Allied Chemical Corp. | added 1/67; 4/70; eliminated 10/72 | | NRHS |
| 1254 | GCX | Alltank Equipment Corp. | added 10/72; 1/75-1/94; eliminated 7/95; eliminated 1/99 | | NRHS |
| 1255 | GCX | AlliedSignal Inc. | added 1/99; eliminated 7/2000 | | NRHS |
| 1256 | GCX | Honeywell International, Inc. | added 7/2000; 7/2000 | | NRHS |
| 1257 | GCX | HONEYWELL INTERNATIONAL, INC. [ALLIED SIGNAL; ALLTANK EQUIPMENT CO. GENERAL CHEMICAL DIV., ALLIED CHEMICAL & DYE] | | | PWRC |
| 1258 | GCX | Alltank Equipment Co. General Chemical Division (Honeywell) | | | RSRV |
| 1259 | GCX | HONEYWELL INTERNATIONAL INC | | | SCAC4 |
| 1260 | GCXC | GLACIER TRANSPORTATION LLC | | | SCAC4 |
| 1261 | GCXI | G & C TRANSPORT INC | | | SCAC4 |
| 1262 | GCXS | GLEZCO EXPRESS | | | SCAC4 |
| 1263 | GCXT | GARCIAS TRANSPORT | | | SCAC4 |
| 1264 | GCXU | GLOBAL CONTAINER INTERNATIONAL LLC | | USA | BIC |
| 1265 | GCY | CHC Global Operations International | Callsign: Helibird, | GB | AVCODES |
| 1266 | GCY | (The) Greene County R.R. (Co.) | 7/1923-7/1954 | | NAKINA |
| 1267 | GCY | Green County R.R. | 4/38-1/52 | | NRHS |
| 1268 | GCY | GREENE COUNTY RAILROAD CO. | | | PWRC |
| 1269 | GCYC | GARDEN CITY COOP INC | | | SCAC4 |
| 1270 | GCYK | GREAT COUNTRY TRUCKING INC | | | SCAC4 |
| 1271 | GCYO | GRANT COUNTY OIL CO INC | | | SCAC4 |
| 1272 | GCYT | GAS CYLINDER TECHNOLOGIES INC | | | SCAC4 |
| 1273 | GD | Transportes Aereos Ejecutivos, S.A. de C.V. | ICAO: TEJ, Callsign: Transejecutivos, Ceased operations on 24 February 2000. Designator GD recalled by IATA | MEX | AVCODES |
| 1274 | GD | Air Alpha Greenland A/S | ICAO: AHA, Callsign: Air Alpha, Designator GD recalled by IATA | GRO | AVCODES |
| 1275 | GD | Midland Air Cargo Ltd. | Callsign: Midcar, | GB | AVCODES |
| 1276 | GD | Channel Aviation Ltd. | ICAO: GJD, Callsign: Sarnair, Designator GD recalled by IATA | GB | AVCODES |
| 1277 | GD | Grandstar Cargo International Airlines Co., Ltd | ICAO: GSC, Callsign: Grandstar Cargo, Founded in 2008. Ceased operations in May 2012. | PRC | AVCODES |
| 1278 | GD | Aviair Pty Ltd | | AUS | AVCODES |
| 1279 | GDA | Gold Air International Limited | Callsign: Goldair, Purchased by Air Partner. | GB | AVCODES |
| 1280 | GDA | GoldAir | | | ICAO1 |
| 1281 | GDA | Gdansk | Real: ZKM | PL | TRAFFIC |
| 1282 | GDAA | GDA TRUCKING INC | | | SCAC4 |
| 1283 | GDAB | GODDARD, STEVEN R | | | SCAC4 |
| 1284 | GDAC | GILENO DISTRIBUTION SERVICES/ G & E | | | SCAC4 |
| 1285 | GDAF | GRATEFULLY DEADICATED TRUCKIN' INC | | | SCAC4 |
| 1286 | GDAG | G & D TRUCKING LLC | | | SCAC4 |
| 1287 | GDAH | GREATWIDE DEDICATED TRANSPORT II LL | | | SCAC4 |
| 1288 | GDAI | GARDINER, DALE LIVESTOCK TRUCKING I | | | SCAC4 |
| 1289 | GDAK | GOTAAS, DARRELL | | | SCAC4 |
| 1290 | GDAN | G D TRANPORT INC | | | SCAC4 |
| 1291 | GDAS | GDA TRUCKING SERVICES | | | SCAC4 |
| 1292 | GDAW | GDS DELIVERY AND LOGISTICS | | | SCAC4 |
| 1293 | GDB | Gendarmerie Belge | Callsign: Belgian Gendarmerie, | B | AVCODES |
| 1294 | GDB | Gendarmerie Belge | | | ICAO1 |
| 1295 | GDBA | GDB 2007 INC | | | SCAC4 |
| 1296 | GDBI | GRAND BASKET CO INC | | | SCAC4 |
| 1297 | GDBK | GREAT LAKES COLD LOGISTICS INC | | | SCAC4 |
| 1298 | GDBL | GOULD, DONALD BLAINE | | | SCAC4 |
| 1299 | GDBR | GERARD BROTHERS, INC | | | SCAC1 |
| 1300 | GDC | Grand China Air Co., Ltd. | IATA: CN, Callsign: Grand China, IATA Prefix: 895, | PRC | AVCODES |
