| 1001 | GCHH | GOLD COAST HEAVY HAULING INC | | | SCAC4 |
| 1002 | GCHI | GROCERY HAULERS INC | | | SCAC4 |
| 1003 | GCHL | GORDON TRUCKING INC (CHINO LOCAL FL | | | SCAC4 |
| 1004 | GCHO | GAUCHOS TRUCKING | | | SCAC4 |
| 1005 | GCHQ | GUNTHER CHARTERS INC | | | SCAC4 |
| 1006 | GCHR | GALATI CHEESE COMPANY LTD | | | SCAC4 |
| 1007 | GCHT | GRAVES, C H TRUCKING | | | SCAC4 |
| 1008 | GCHU | GULF CARIB LINES | | | SCAC4 |
| 1009 | GCHV | GARCIA CAVAZOS, HOMERO | | | SCAC4 |
| 1010 | GCHX | GRAND CYPRESS RESORT HYATT HOTEL | | | PWRC |
| 1011 | GCI | Guarda Costiera Italiana | Callsign: Italian Coast Guard, | I | AVCODES |
| 1012 | GCIH | GUGGISBERG CHEESE INC | | | SCAC4 |
| 1013 | GCIP | GRUPO CORSA INTERNACIONAL | | | SCAC4 |
| 1014 | GCIQ | GROUPE CANAM INC | | | SCAC4 |
| 1015 | GCIR | | | IRQ | TRAFFIC |
| 1016 | GCIU | GLOBAL CONTAINER AND CHASSIS | | USA | BIC |
| 1017 | GCIU | GLOBAL CONTAINER LINES (BAHAMAS) LT | | | SCAC4 |
| 1018 | GCIX | Gabriel Chemicals | added 1/1997; eliminated 1/1998; 7/2000-7/2005 (not listed) | | NAKINA |
| 1019 | GCIX | Gabriel Chemicals | added 1/97; eliminated 1/98; 7/2000 | | NRHS |
| 1020 | GCIX | GABRIEL CHEMICALS, INC. | | | PWRC |
| 1021 | GCIX | Gabriel Chemicals | | | RSRV |
| 1022 | GCK | Aerogem Cargo Ltd. | Callsign: Aerogem, | GH | AVCODES |
| 1023 | GCK | Glock Aviation GmbH | Callsign: Glock, | A | AVCODES |
| 1024 | GCK | Aerogem Cargo | | | ICAO1 |
| 1025 | GCK | GEORGES CREEK RAILWAY | | | PWRC |
| 1026 | GCK | GEORGES CREEK RAILWAY | | | SCAC4 |
| 1027 | GCKE | G & C TRUCKLINES | | | SCAC4 |
| 1028 | GCKG | GO-CO TRUCKING | | | SCAC4 |
| 1029 | GCKN | GLOUCESTER CO TRUCKING CO | | | SCAC4 |
| 1030 | GCKO | GRECKO TRUCKING | | | SCAC4 |
| 1031 | GCKP | GRACE TRUCKING | | | SCAC4 |
| 1032 | GCL | Greenclose Aviation Services Ltd. | Callsign: Greenclose, | GB | AVCODES |
| 1033 | GCL | CargoLogic Germany GmbH | IATA: 6L, Callsign: Saxonian, IATA Prefix: 342, | D | AVCODES |
| 1034 | GCLE | GLOBAL CONTAINER LINE | | | SCAC4 |
| 1035 | GCLG | G & C LOGISTICS LLC | | | SCAC4 |
| 1036 | GCLH | GC LOGISTICS INC | | | SCAC4 |
| 1037 | GCLJ | GREEN COAST LOGISTICS LLC | | | SCAC4 |
| 1038 | GCLL | G C L TRUCKING SERVICE INTERNATIONA | | | SCAC4 |
| 1039 | GCLM | GUERIN, CLERMONT/CLEAN TRANSPORT | | | SCAC4 |
| 1040 | GCLQ | GRACE LOGISTICS INC | | | SCAC4 |
| 1041 | GCLR | GANCLEAR SHIPPING SA | | | SCAC4 |
| 1042 | GCLU | L. G. COM. E ENVASE DE GASES DO AR LTDA | | BR | BIC |
| 1043 | GCLV | GREAT CONNECTIONS LOGISTICS | | | SCAC4 |
| 1044 | GCLW | GARDA CL SOUTHWEST INC | | | SCAC4 |
| 1045 | GCLX | Gold Coast Ltd. | 7/2000-7/2005 (not listed) | | NAKINA |
| 1046 | GCLX | General Chemical Canada, Ltd. | added 1/1988; eliminated 7/1991 | | NAKINA |
| 1047 | GCLX | Glaser, Crandell Co. | 8/1920-4/1961; 7/1965 (not listed); eliminated 7/1965 | | NAKINA |
| 1048 | GCLX | Glaser, Crandell Co. | 4/38-7/65; eliminated 7/65 | | NRHS |
| 1049 | GCLX | General Chemical Canada, Ltd. | added 1/88; eliminated 7/91 | | NRHS |
| 1050 | GCLX | Gold Coast Ltd. | Jul-00 | | NRHS |
| 1051 | GCLX | *GLASER CRANDELL CO. | | | PWRC |
| 1052 | GCLX | *GENERAL CHEMICALS CANADA, LTD. [RETIRED 08-13-91 ATP (6159)] | | | PWRC |
| 1053 | GCLX | +GOLD COAST LIMITED | | | PWRC |
| 1054 | GCLX | Gold Coast | | | RSRV |
| 1055 | GCLZ | GLOBAL CHASSIS LEASING, INC. | | | PWRC |
| 1056 | GCLZ | Global Chassis Leasing | | | RSRV |
| 1057 | GCLZ | GLOBAL CHASSIS LEASING INC | | | SCAC4 |
| 1058 | GCM | Comair Flight Services (Pty) Ltd | Callsign: Globecom, | ZA | AVCODES |
| 1059 | GCMD | GRAND CENTRAL MARKETING INC | | | SCAC4 |
| 1060 | GCMH | GCM TRUCKING INC | | | SCAC4 |
| 1061 | GCMI | GRUPO COMERCIAL CM SA DE CV | | | SCAC4 |
| 1062 | GCMK | GRAIN | | | SCAC4 |
| 1063 | GCML | GARCIA, MINERVA LUIS | | | SCAC4 |
| 1064 | GCMN | GRACE MANAGEMENT S A | | | SCAC4 |
| 1065 | GCMO | GRAEBEL CLEVELAND MOVERS INC | | | SCAC4 |
| 1066 | GCMP | GENCOM TRANSPORTATION, INC | | | SCAC1 |
| 1067 | GCMR | GARCIA AMEZCUA, RICARDO | | | SCAC4 |
| 1068 | GCMS | GM CARGO | | | SCAC4 |
| 1069 | GCMU | SHAANXI GREATROAD INDUSTRIAL CO LTD | | PRC | BIC |
| 1070 | GCMU | MORLEY, | | | SCAC4 |
| 1071 | GCMV | GRAEBEL/CINCINNA | | | SCAC4 |
| 1072 | GCMX | Gulf Coast Chapter—National Railway Historical Society Inc. | 7/2005 (not listed) | | NAKINA |
| 1073 | GCMX | Gulf Coast Management Corp. | added 7/1985; eliminated 1/1988 | | NAKINA |
| 1074 | GCMX | Garfield Chemical & Manufacturing Corp. | added 4/1957; 10/1957; eliminated 1/1961 | | NAKINA |
| 1075 | GCMX | Garfield Chemical & Manufacturing Co. (American Smelting & Refining Co.) | added 11/1934; 7/1935-4/1938 | | NAKINA |
| 1076 | GCMX | Garfield Chemical & Manufacturing Co. (American Smelting & Refining Co.) | Apr-38 | | NRHS |
| 1077 | GCMX | Garfield Chemical & Manufacturing Corp. | added 4/57; 10/57 | | NRHS |
| 1078 | GCMX | Gulf Coast Management Corp. | eliminated 1/88 | | NRHS |
| 1079 | GCMX | *GARFIELD CHEMICAL & MANUFACTURING CORP. | | | PWRC |
| 1080 | GCMX | *GULF COAST MANAGEMENT CORP. | | | PWRC |
| 1081 | GCMX | +NATIONAL RAILWAY HISTORICAL SOCIETY, GULF COAST CHAPTER | | | PWRC |
| 1082 | GCMX | Gold Coast Chapter National Railway Historical Society | | | RSRV |
| 1083 | GCMX | GULF COAST CHAPTER-NATIONAL RAILWAY | | | SCAC4 |
| 1084 | GCMY | GOLD COUNTRY MOVING & STORAGE | | | SCAC4 |
| 1085 | GCN | Gulf Central Airlines, Inc. | Callsign: gulf Central, | USA | AVCODES |
| 1086 | GCN | Gulf Central Airlines | | | ICAO1 |
| 1087 | GCN | *RETIRED 01-21-92 ATP (333) | | | PWRC |
| 1088 | GCN | *GARDEN CITY NORTHERN RWY. | | | PWRC |
| 1089 | GCNF | GLOBE CON FREIGHT SYSTEMS INC | | | SCAC4 |
| 1090 | GCNN | GREAT CANADIAN NICKELODEON CO LTD, | | | SCAC4 |
| 1091 | GCNS | GIROUX, CHRISTIAN | | | SCAC4 |
| 1092 | GCNU | GRIMALDI GROUP SPA | | I | BIC |
| 1093 | GCNU | GRIMALDI COMPAGNIA DI NAVIGAZIONE | | | SCAC4 |
| 1094 | GCNX | General Construction Corp. | 4/1947-1/1950 | | NAKINA |
| 1095 | GCNX | GENERAL CONSTRUCTION CORP. | | | PWRC |
| 1096 | GCO | Gemini Air Cargo LLC | IATA: GR, Callsign: Gemini, IATA Prefix: 358, Ceased operations on 12 August 2008 | USA | AVCODES |
| 1097 | GCO | Gemini Air Cargo | IATA: GR | | ICAO1 |
| 1098 | GCOC | GAGE COUNTY OIL CO INC | | | SCAC4 |
| 1099 | GCOD | GILCO TRANSPORTATION INC | | | SCAC4 |
| 1100 | GCOF | GREENWOOD CONSTRUCTION | | | SCAC4 |
