| 901 | GCC | General Electric Capital Aviation Services | Callsign: GECAS, | IRL | AVCODES |
| 902 | GCC | GECAS | | | ICAO1 |
| 903 | GCC | GEORGES CREEK & CUMBERLAND RR | | | PWRC |
| 904 | GCCA | GEESE CARTAGE & COURIER LLC | | | SCAC4 |
| 905 | GCCB | GERRARD CATTLE COMPANY INC | | | SCAC4 |
| 906 | GCCD | GLASSCOCK COUNTY CO-OP | | | SCAC4 |
| 907 | GCCF | GENERAL CONVEYOR CO LTD | | | SCAC4 |
| 908 | GCCG | GOLDEN CIRCLE CARTAGE INC | | | SCAC4 |
| 909 | GCCH | GLOBAL CARGO CONNECTION | | | SCAC4 |
| 910 | GCCI | GREAT CANADIAN COACHES INC | | | SCAC4 |
| 911 | GCCJ | GULF CONSOLIDATED CHASSIS POOL LLC | | | SCAC4 |
| 912 | GCCM | GRACE CHARTERING CORPORATION | | | SCAC4 |
| 913 | GCCO | GENERAL CHEMICAL CORPORATION | | | SCAC4 |
| 914 | GCCQ | GCC EQUIPMENT LCC | | | SCAC4 |
| 915 | GCCT | GCC TRANSPORTE SA DE CV | | | SCAC4 |
| 916 | GCCU | GREEN CONTAINERS AB | | DK | BIC |
| 917 | GCCU | CONSTELLATION NAVIGATION | | | SCAC3 |
| 918 | GCCU | GE CAPITAL CONTAINER FINANCE CORP | | | SCAC4 |
| 919 | GCCV | GILBERT TRUCKING INC | | | SCAC4 |
| 920 | GCCX | General American Marks Co. | added 1/2003; 7/2005 | | NAKINA |
| 921 | GCCX | GATX Financial Corp. | added 1/2002; eliminated 1/2003 | | NAKINA |
| 922 | GCCX | GATX Capital Corp. | added 10/1990; 1/1994-7/2000; eliminated 1/2002 | | NAKINA |
| 923 | GCCX | GATX Leasing Corp. | added 7/1990; eliminated 10/1990 | | NAKINA |
| 924 | GCCX | General Cable Corp. | added 10/1963; 7/1965-1/1975; eliminated 7/1978 | | NAKINA |
| 925 | GCCX | Crown Zellerbach Corp. | eliminated 10/1960 | | NAKINA |
| 926 | GCCX | Gaylord Container Division, Crown Zellerbach Corp. | added 1/1960 | | NAKINA |
| 927 | GCCX | Gaylord Container Corp., Division of Crown Zellerbach Corp. | added 7/1956; eliminated 1/1960 | | NAKINA |
| 928 | GCCX | Gaylord Container Corp. | 4/1947-10/1957; eliminated 7/1956 | | NAKINA |
| 929 | GCCX | Gaylord Container Corp. | 1/52-10/57; eliminated 7/56 | | NRHS |
| 930 | GCCX | Gaylord Container Corp., Division of Crown Zellerbach Corp. | added 7/56; eliminated 1/60 | | NRHS |
| 931 | GCCX | Gaylord Container Division, Crown Zellerbach Corp. | added 1/60 | | NRHS |
| 932 | GCCX | Crown Zellerbach Corp. | eliminated 10/60 | | NRHS |
| 933 | GCCX | General Cable Corp. | 7/65-1/75; eliminated 7/78 | | NRHS |
| 934 | GCCX | GATX Leasing Corp. | added 7/90; eliminated 10/90 | | NRHS |
| 935 | GCCX | GATX Capital Corp. | added 10/90; 1/94-7/2000 | | NRHS |
| 936 | GCCX | GENERAL AMERICAN MARKS COMPANY (GATX) (GENERAL CABLE CORP.; CROWN ZELLERBACH CORP.; GAYLORD CONTAINER CORP.0 | | | PWRC |
| 937 | GCCX | General American Marks (GATX Corporation) | | | RSRV |
| 938 | GCCX | GENERAL AMERICAN MARKS COMPANY | | | SCAC4 |
| 939 | GCCX | General American Marks Company (GATX) | | USA | TRAFFIC |
| 940 | GCCY | GCC LOGISTICS SALES LLC | | | SCAC4 |
| 941 | GCCZ | GIBSON COUNTY CO-OP | | | PWRC |
| 942 | GCD | West Georgia | Callsign: West Georgia, | GE | AVCODES |
| 943 | GCDA | GARDEN COURT DENTAL LAB | | | SCAC4 |
| 944 | GCDC | GULF CENTRAL DISTRIBUTION CENTER IN | | | SCAC4 |
| 945 | GCDF | GORDON TRUCKING INC (GORDON CHEP DE | | | SCAC4 |
| 946 | GCDS | GENOVEVO CANO DE LA ROSA | | | SCAC4 |
| 947 | GCDU | OVERSEAS CONTAINER LTD | | | PWRC |
| 948 | GCDU | Overseas Container Ltd. | | | RSRV |
| 949 | GCDU | P & O STEAM NAVIGATION COMPANY | | | SCAC3 |
| 950 | GCDU | P & O STEAM NAVIGATION COMPANY | | | SCAC4 |
| 951 | GCDV | GERAY, CHAD DAVID | | | SCAC4 |
| 952 | GCE | Air Europa Canarias Lineas Aereas S.A.U. | Callsign: Europa Canarias, Ceased operations | E | AVCODES |
| 953 | GCEA | GOLF CAR EXPRESS | | | SCAC4 |
| 954 | GCED | GLOBAL CARGO EXPRESS INC | | | SCAC4 |
| 955 | GCEG | GRACE ENERGY CORPORATION | | | SCAC4 |
| 956 | GCEK | GREGORY, C E TRUCKING | | | SCAC4 |
| 957 | GCEN | Grand Central Railway | | GB | TRAFFIC |
| 958 | GCEP | GC3 LOGISTICS LLC | | | SCAC4 |
| 959 | GCEQ | GHISLAIN CHARTRAND EXCAVATION INC | | | SCAC4 |
| 960 | GCEU | SEACO SRL | | BDS | BIC |
| 961 | GCEU | GENSTAR CONTAINER CORPORATION | | | PWRC |
| 962 | GCEU | Genstar Container Corporation | | | RSRV |
| 963 | GCEU | GENSTAR CONTAINER CORPORATION | | | SCAC4 |
| 964 | GCEX | Gulf Coast Grain Co. | 1/1980 | | NAKINA |
| 965 | GCEX | Gulf Coast Grain Co. | Jan-80 | | NRHS |
| 966 | GCEX | GULF COAST GRAIN CO. | | | PWRC |
| 967 | GCEZ | GENSTAR CONTAINER CORPORATION | | | PWRC |
| 968 | GCEZ | Genstar Container Corporation | | | RSRV |
| 969 | GCF | Aeronor | Callsign: Aerocarto, | E | AVCODES |
| 970 | GCF | Aeronor | | | ICAO1 |
| 971 | GCF | Generale Construzioni Ferroviarie | | I | TRAFFIC |
| 972 | GCF | G.C.F. Generale Costruzioni Ferroviarie | | IT | VKM |
| 973 | GCFA | GRANT, CHARLES FARMS | | | SCAC4 |
| 974 | GCFB | GLEANERS COMMUNITY FOOD BANK OF SOU | | | SCAC4 |
| 975 | GCFC | G-C-F TRANSPORT COOPERATIVE ASSOCIA | | | SCAC4 |
| 976 | GCFD | GRAND COASTAL FORWARDING | | | SCAC4 |
| 977 | GCFG | GOLD CARGO FREIGHT CORP | | | SCAC4 |
| 978 | GCFH | GOTO CALIFORNIA INC | | | SCAC4 |
| 979 | GCFK | GRANITE CREEK FARM | | | SCAC4 |
| 980 | GCFM | GLI-CO FARMS | | | SCAC4 |
| 981 | GCFN | GOWELLS CASH FUEL INC | | | SCAC4 |
| 982 | GCFO | GRANUM COLONY FARMING CO LTD | | | SCAC4 |
| 983 | GCFQ | GULF COAST FREIGHT INC | | | SCAC4 |
| 984 | GCFX | Alsthon Canada Inc. — Transport | 7/2000-7/2005 (not listed) | | NAKINA |
| 985 | GCFX | Alsthon Canada Inc. -- Transport | Jul-00 | | NRHS |
| 986 | GCFX | ALSTOM CANADA INCORPORATED - TRANSPORT | | | PWRC |
| 987 | GCFX | Alstom Canada Transport | | | RSRV |
| 988 | GCFX | ALSTHON CANADA INC-TRANSPORT | | | SCAC4 |
| 989 | GCFX | Alstom Canada Incorporated | | CDN | TRAFFIC |
| 990 | GCGM | GARZA CABALLERO, GERONIMO MARCELINO | | | SCAC4 |
| 991 | GCGR | GREEN CIRCLE GROWERS INC | | | SCAC4 |
| 992 | GCGU | SICO - SOCIETA ITALIANA CARBURO OSSIGENO | | I | BIC |
| 993 | GCGU | SICO-SOCIETA ITALIANA CARBURO OSSIG | | | SCAC4 |
| 994 | GCGX | Gulf Coast Grain, Inc. | added 7/1979; 1/1980; added 7/1987 | | NAKINA |
| 995 | GCGX | Gulf Coast Grain, Inc. | added 7/79; 1/80; added 7/87 | | NRHS |
| 996 | GCGX | GULF COAST GRAIN INC. | | | PWRC |
| 997 | GCGX | Gulf Coast Grain | | | RSRV |
| 998 | GCH | Gama Aviation SA | Callsign: Gama Swiss, | CH | AVCODES |
| 999 | GCHA | GLOBAL CHARTERING LTD | | | SCAC4 |
| 1000 | GCHC | GROWLER COVE HOLDING CORPORATION | | | SCAC4 |
