| 1 | GRP | Ozark Air Lines, Inc. d/b/a/ Great Plains Airlines | IATA: ZO, Callsign: Great Plains, Name changed from Ozark Air Lines, Inc. Founded in 2001. Ceased operations in 2004. ICAO designator changed from OZR | USA | AVCODES |
| 2 | GRP | Gryphon Air, LLC | Callsign: Air Fox, | USA | AVCODES |
| 3 | GRP | Great Plains Airlines | | | ICAO1 |
| 4 | GRPE | GRAPHIC ARTS EXPRESS INC | | | SCAC4 |
| 5 | GRPI | GRESS POULTRY INC | | | SCAC4 |
| 6 | GRPJ | GROUPE TRANSTECK INC | | | SCAC4 |
| 7 | GRPL | GRISHAM PETROLEUM INC | | | SCAC4 |
| 8 | GRPN | G R P I T INC | | | SCAC4 |
| 9 | GRPO | GREEN PETROLEUM CO | | | SCAC4 |
| 10 | GRPQ | GENERAL TRANSPORT INC | | | SCAC4 |
| 11 | GRPT | Grande Prairie Transit | | CG | TRAFFIC |
| 12 | GRPU | TRISTAR ENGINNERING CONSULTING LOGISTIC SA | | CH | BIC |
| 13 | GRPU | GRP MULTI-LOGISTICS SA | | | SCAC4 |
| 14 | GRPV | GROUP PETROLEUM SERVICES INC | | | SCAC4 |
| 15 | GRPX | The CIT Group/Capital Finance, Inc. | added 10/1999; 7/2000-7/2005 | | NAKINA |
| 16 | GRPX | General Chemical (Soda Ash) Partners | added 7/1987; 1/1994; eliminated 10/1999 | | NAKINA |
| 17 | GRPX | General Chemical (Soda Ash) Partners | added 7/87; 1/94; eliminated 10/99 | | NRHS |
| 18 | GRPX | The CIT Group/Capital Finance, Inc. | added 10/99; 7/2000 | | NRHS |
| 19 | GRPX | CIT GROUP/CAPITAL FINANCE (GENERAL CHEMICAL (SODA ASH) PARTNERS, LESSEE) | | | PWRC |
| 20 | GRPX | General Chemical (CIT Financial) | | | RSRV |
| 21 | GRPX | CIT GROUP/CAPITAL FINANCE INC, THE | | | SCAC4 |
| 22 | GRPX | General Chemical (Soda Ash) Partners | | USA | TRAFFIC |
| 23 | GRPY | GRP INC | | | SCAC4 |
| 24 | GRPZ | GREAT LAKES CARBON PLANT | | | PWRC |
