| 1 | GC | Gambia International Airlines Ltd. | ICAO: GNR, Callsign: Gambia International, IATA Prefix: 034, Designator GC reinstated by IATA. Ceased opeation in 2007. IATA deignator changed from GC* | WAG | AVCODES |
| 2 | GC | Great China Airlines | ICAO: GCA, Designator GC recalled by IATA | PRC | AVCODES |
| 3 | GC | Gambia International Airlines Ltd. | ICAO: GNR, Callsign: Gambia International, IATA deignator changed to GC | WAG | AVCODES |
| 4 | GC | Centrafrican Airlines | ICAO: CET, Callsign: Centrafrican, Designator GC recalled by IATA | RCA | AVCODES |
| 5 | GC | Global Feeder Services, LLC | IATA Prefix: 282, | USA | AVCODES |
| 6 | GC | Georgia Central Ry. | eliminated 10/1992 | | NAKINA |
| 7 | GC | Georgia Central Ry., L.P. | added 10/1992; 1/1994-7/2000; eliminated 7/2003, added 7/2005; 7/2005 | | NAKINA |
| 8 | GC | Georgia Central Ry., a Division of Wilmington Terminal R.R., Inc. | added 1/1991 | | NAKINA |
| 9 | GC | Graham County R.R., Inc. | added 7/1982; eliminated 1/1984 | | NAKINA |
| 10 | GC | Graham County R.R. Co. | added 1/1974; 1/1975-1/1980; eliminated 4/1981 | | NAKINA |
| 11 | GC | Graham County R.R. Co. | added 1/74; 1/75-1/80; eliminated 4/81 | | NRHS |
| 12 | GC | Graham County R.R., Inc. | added 7/82 | | NRHS |
| 13 | GC | Georgia Central Ry., a Division of Wilmington Terminal R.R., Inc. | added 1/91 | | NRHS |
| 14 | GC | Georgia Central Ry. | eliminated 10/92 | | NRHS |
| 15 | GC | Georgia Central Ry., L.P. | added 10/92; 1/94-7/2000 | | NRHS |
| 16 | GC | GEORGIA CENTRAL RAILWAY, LP [GRAHAM COUNTY RAILROAD CO.] | | | PWRC |
| 17 | GC | Georgia Central Railway | | | RSRV |
| 18 | GC | GEORGIA CENTRAL RAILWAY L P | | | SCAC4 |
| 19 | GC | Green Cargo | | S | TRAFFIC |
| 20 | GC | Green Cargo AB | | SE | VKM |
| 21 | GCA | Georgian Cargo Airlines | Callsign: Georgian Cargo, | GE | AVCODES |
| 22 | GCA | Great China Airlines | IATA: GC, Designator GC recalled by IATA | PRC | AVCODES |
| 23 | GCA | Great China Airlines | IATA: IF, Designator IF recalled by IATA | PRC | AVCODES |
| 24 | GCA | UAB Grand Cru Airlines | Callsign: Grand Cru, | LT | AVCODES |
| 25 | GCA | Gran Colombia de Aviacion SAS d/b/a GCA Airlines | IATA: 9A, Founded in June 2017. Subsidiary of the Avior Group. Commenced operations on 29 November 2019. | CO | AVCODES |
| 26 | GCA | Servicios Aereos GECA S.A. d/b/a GECA | IATA: D6, Callsign: Aerogeca, | DOM | AVCODES |
| 27 | GCA | Grampetcargo Austria | | A | TRAFFIC |
| 28 | GCAB | GLOBAL CARGO TRANSPORT INC | | | SCAC4 |
| 29 | GCAC | GULF CARRIER CORP | | | SCAC4 |
| 30 | GCAF | GRIEGER, CHARLES A INC | | | SCAC4 |
| 31 | GCAJ | GALANT CARTAGE | | | SCAC4 |
| 32 | GCAL | GCA LOGISTICS GROUP INC | | | SCAC4 |
| 33 | GCAM | GUENTHER, CARL | | | SCAC4 |
| 34 | GCAN | Gran Canaria | | E | TRAFFIC |
| 35 | GCAO | GEORGETOWN PAPER STOCK OF ROCKVILLE | | | SCAC4 |
| 36 | GCAQ | GARCIA, A TRUCKING | | | SCAC4 |
| 37 | GCAR | GADSDEN CARTAGE COMPANY INC | | | SCAC4 |
| 38 | GCAS | GASCA, JOSE ALBERTO AND GARSCA ESPA | | | SCAC4 |
| 39 | GCAT | GRACE CATTLE CARRIERS INC | | | SCAC4 |
| 40 | GCAU | GCA VRAC TCPL | | F | BIC |
| 41 | GCAU | G.C.A. TRANSPORTS LTD. | | | PWRC |
| 42 | GCAU | G.C.A. Transport | | | RSRV |
| 43 | GCAU | SOLOGAZ | | | SCAC4 |
| 44 | GCAU | GrainCorp | Real: GC | AUS | TRAFFIC |
| 45 | GCAW | GRANDWEST CORP | | | SCAC4 |
| 46 | GCAX | Gaylord Container Corp. | 7/1937 (not listed) | | NAKINA |
| 47 | GCAX | GAYLORD CONTAINER CORP. | | | PWRC |
| 48 | GCAY | GTL CARRIERS | | | SCAC4 |
| 49 | GCB | Lignes Nationales Aeriennes - Linacongo | | | ICAO1 |
| 50 | GCBC | GUILDCREST BUILDING CORPORATION | | | SCAC4 |
| 51 | GCBD | GC LOGISTICA | | | SCAC4 |
| 52 | GCBI | GRIFFIN TRUCKING LLC | | | SCAC4 |
| 53 | GCBL | G C S TRANSPORTATION | | | SCAC4 |
| 54 | GCBR | GARCIA BARRERA, TORIBIO | | | SCAC4 |
| 55 | GCBU | TRANSPORT GHEYS NV | | B | BIC |
| 56 | GCBU | TRANSPORT GHEYS NV | | | SCAC4 |
| 57 | GCBX | Gray Chemical Co. | 7/1935-1/1946 | | NAKINA |
| 58 | GCBX | Gray Chemical Co. | Apr-38 | | NRHS |
| 59 | GCBX | GRAY CHEMICAL CO. | | | PWRC |
| 60 | GCC | General Electric Capital Aviation Services | Callsign: GECAS, | IRL | AVCODES |
| 61 | GCC | GECAS | | | ICAO1 |
| 62 | GCC | GEORGES CREEK & CUMBERLAND RR | | | PWRC |
| 63 | GCCA | GEESE CARTAGE & COURIER LLC | | | SCAC4 |
| 64 | GCCB | GERRARD CATTLE COMPANY INC | | | SCAC4 |
| 65 | GCCD | GLASSCOCK COUNTY CO-OP | | | SCAC4 |
| 66 | GCCF | GENERAL CONVEYOR CO LTD | | | SCAC4 |
| 67 | GCCG | GOLDEN CIRCLE CARTAGE INC | | | SCAC4 |
| 68 | GCCH | GLOBAL CARGO CONNECTION | | | SCAC4 |
| 69 | GCCI | GREAT CANADIAN COACHES INC | | | SCAC4 |
| 70 | GCCJ | GULF CONSOLIDATED CHASSIS POOL LLC | | | SCAC4 |
| 71 | GCCM | GRACE CHARTERING CORPORATION | | | SCAC4 |
| 72 | GCCO | GENERAL CHEMICAL CORPORATION | | | SCAC4 |
| 73 | GCCQ | GCC EQUIPMENT LCC | | | SCAC4 |
| 74 | GCCT | GCC TRANSPORTE SA DE CV | | | SCAC4 |
| 75 | GCCU | GREEN CONTAINERS AB | | DK | BIC |
| 76 | GCCU | CONSTELLATION NAVIGATION | | | SCAC3 |
| 77 | GCCU | GE CAPITAL CONTAINER FINANCE CORP | | | SCAC4 |
| 78 | GCCV | GILBERT TRUCKING INC | | | SCAC4 |
| 79 | GCCX | General American Marks Co. | added 1/2003; 7/2005 | | NAKINA |
| 80 | GCCX | GATX Financial Corp. | added 1/2002; eliminated 1/2003 | | NAKINA |
| 81 | GCCX | GATX Capital Corp. | added 10/1990; 1/1994-7/2000; eliminated 1/2002 | | NAKINA |
| 82 | GCCX | GATX Leasing Corp. | added 7/1990; eliminated 10/1990 | | NAKINA |
| 83 | GCCX | General Cable Corp. | added 10/1963; 7/1965-1/1975; eliminated 7/1978 | | NAKINA |
| 84 | GCCX | Crown Zellerbach Corp. | eliminated 10/1960 | | NAKINA |
| 85 | GCCX | Gaylord Container Division, Crown Zellerbach Corp. | added 1/1960 | | NAKINA |
| 86 | GCCX | Gaylord Container Corp., Division of Crown Zellerbach Corp. | added 7/1956; eliminated 1/1960 | | NAKINA |
| 87 | GCCX | Gaylord Container Corp. | 4/1947-10/1957; eliminated 7/1956 | | NAKINA |
| 88 | GCCX | Gaylord Container Corp. | 1/52-10/57; eliminated 7/56 | | NRHS |
| 89 | GCCX | Gaylord Container Corp., Division of Crown Zellerbach Corp. | added 7/56; eliminated 1/60 | | NRHS |
| 90 | GCCX | Gaylord Container Division, Crown Zellerbach Corp. | added 1/60 | | NRHS |
| 91 | GCCX | Crown Zellerbach Corp. | eliminated 10/60 | | NRHS |
| 92 | GCCX | General Cable Corp. | 7/65-1/75; eliminated 7/78 | | NRHS |
| 93 | GCCX | GATX Leasing Corp. | added 7/90; eliminated 10/90 | | NRHS |
| 94 | GCCX | GATX Capital Corp. | added 10/90; 1/94-7/2000 | | NRHS |
| 95 | GCCX | GENERAL AMERICAN MARKS COMPANY (GATX) (GENERAL CABLE CORP.; CROWN ZELLERBACH CORP.; GAYLORD CONTAINER CORP.0 | | | PWRC |
| 96 | GCCX | General American Marks (GATX Corporation) | | | RSRV |
| 97 | GCCX | GENERAL AMERICAN MARKS COMPANY | | | SCAC4 |
| 98 | GCCX | General American Marks Company (GATX) | | USA | TRAFFIC |
| 99 | GCCY | GCC LOGISTICS SALES LLC | | | SCAC4 |
| 100 | GCCZ | GIBSON COUNTY CO-OP | | | PWRC |
