| 1 | GCL | Greenclose Aviation Services Ltd. | Callsign: Greenclose, | GB | AVCODES |
| 2 | GCL | CargoLogic Germany GmbH | IATA: 6L, Callsign: Saxonian, IATA Prefix: 342, | D | AVCODES |
| 3 | GCLE | GLOBAL CONTAINER LINE | | | SCAC4 |
| 4 | GCLG | G & C LOGISTICS LLC | | | SCAC4 |
| 5 | GCLH | GC LOGISTICS INC | | | SCAC4 |
| 6 | GCLJ | GREEN COAST LOGISTICS LLC | | | SCAC4 |
| 7 | GCLL | G C L TRUCKING SERVICE INTERNATIONA | | | SCAC4 |
| 8 | GCLM | GUERIN, CLERMONT/CLEAN TRANSPORT | | | SCAC4 |
| 9 | GCLQ | GRACE LOGISTICS INC | | | SCAC4 |
| 10 | GCLR | GANCLEAR SHIPPING SA | | | SCAC4 |
| 11 | GCLU | L. G. COM. E ENVASE DE GASES DO AR LTDA | | BR | BIC |
| 12 | GCLV | GREAT CONNECTIONS LOGISTICS | | | SCAC4 |
| 13 | GCLW | GARDA CL SOUTHWEST INC | | | SCAC4 |
| 14 | GCLX | Gold Coast Ltd. | 7/2000-7/2005 (not listed) | | NAKINA |
| 15 | GCLX | General Chemical Canada, Ltd. | added 1/1988; eliminated 7/1991 | | NAKINA |
| 16 | GCLX | Glaser, Crandell Co. | 8/1920-4/1961; 7/1965 (not listed); eliminated 7/1965 | | NAKINA |
| 17 | GCLX | Glaser, Crandell Co. | 4/38-7/65; eliminated 7/65 | | NRHS |
| 18 | GCLX | General Chemical Canada, Ltd. | added 1/88; eliminated 7/91 | | NRHS |
| 19 | GCLX | Gold Coast Ltd. | Jul-00 | | NRHS |
| 20 | GCLX | *GLASER CRANDELL CO. | | | PWRC |
| 21 | GCLX | *GENERAL CHEMICALS CANADA, LTD. [RETIRED 08-13-91 ATP (6159)] | | | PWRC |
| 22 | GCLX | +GOLD COAST LIMITED | | | PWRC |
| 23 | GCLX | Gold Coast | | | RSRV |
| 24 | GCLZ | GLOBAL CHASSIS LEASING, INC. | | | PWRC |
| 25 | GCLZ | Global Chassis Leasing | | | RSRV |
| 26 | GCLZ | GLOBAL CHASSIS LEASING INC | | | SCAC4 |
