| 1 | GBR | Rader Aviation, Inc. | Callsign: Greenbrier Air, | USA | AVCODES |
| 2 | GBR | Rader Aviation | | | ICAO1 |
| 3 | GBRA | GRABER AGRICULTURAL SERVICE | | | PWRC |
| 4 | GBRA | GARCIA BARRERA, MIGUEL ANGEL | | | SCAC4 |
| 5 | GBRC | GLOBAL REEFER CARRIERS | | | SCAC1 |
| 6 | GBRC | GLOBAL REEFERS CARRIERS | | | SCAC4 |
| 7 | GBRCT | Royal Corps of Transport | Real: RCT | GB | TRAFFIC |
| 8 | GBRD | GROBER INC | | | SCAC4 |
| 9 | GBRE | Groß Bieberau-Reinheimer Eisenbahn GmbH | Reinheim | D | privat-bahn.de |
| 10 | GBRF | GIUMARRABROS FRUIT CO INC | | | SCAC4 |
| 11 | GBRF | GB Railfreight | GB Railfreight (GBRf) is a British freight operating company. It is part of First Group. | GB | TRAFFIC |
| 12 | GBRF | GB Railfreight | | UK | VKM |
| 13 | GBRI | GEORGE, BRIAN D TRUCKING & ENT LTD | | | SCAC4 |
| 14 | GBRK | GARBER BROKERAGE INC | | | SCAC4 |
| 15 | GBRN | GBR TRANSPORT INC | | | SCAC4 |
| 16 | GBRO | GULACHA BROTHERS TRUCKING INC | | | SCAC4 |
| 17 | GBRP | GRIZZLY BEAR ENTERPRIZES | | | SCAC4 |
| 18 | GBRR | GLOBAL REMANUFACTURING | | | SCAC4 |
| 19 | GBRT | GILBERT TRUCKING | | | SCAC1 |
| 20 | GBRU | GREENBRIER LEASING CORP | | | SCAC4 |
| 21 | GBRX | Greenbrier Management Services, LLC | added 7/2005; 7/2005 | | NAKINA |
| 22 | GBRX | Greenbrier Leasing Corp. | added 1/1974; 1/1975-7/2000; eliminated 7/2005 | | NAKINA |
| 23 | GBRX | Greenbrier Leasing Corp. | added 1/74; 1/75-7/2000 | | NRHS |
| 24 | GBRX | GREENBRIER MANAGEMENT SERVICES [GREENBRIER LEASING CORPORATION] | | | PWRC |
| 25 | GBRX | Greenbrier Leasing Corporation | | | RSRV |
| 26 | GBRX | GREENBRIER MANAGEMENT SERVICES LLC | | | SCAC4 |
| 27 | GBRY | Gettysburg Ry. | 7/2000 | | NAKINA |
| 28 | GBRY | Gettysburg Ry. | Jul-00 | | NRHS |
| 29 | GBRY | GETTYSBURG RAILWAY | | | PWRC |
| 30 | GBRY | Gettysburg Railway | | | RSRV |
| 31 | GBRZ | GREENBRIER LEASING CORPORATION | | | PWRC |
| 32 | GBRZ | Greenbrier Leasing Corporation | | | RSRV |
| 33 | GBRZ | GREENBRIER CAPITAL CORPORATION | | | SCAC4 |
