| 1 | GP | Gestair, S.A. | ICAO: GES, Callsign: Gestair, Designator GP* recalled by IATA. Designator EJ recalled by IATA | E | AVCODES |
| 2 | GP | Palau Trans Pacific Airlines, Inc. | Designator GP recalled by IATA | PAL | AVCODES |
| 3 | GP | Air Pegasus GmbH & Co. | | D | AVCODES |
| 4 | GP | Gemini Airlines Ltd. | ICAO: GAL, Callsign: Golf Papa, Designator GP recalled by IATA | GH | AVCODES |
| 5 | GP | Pantanal Linhas Aereas Sul-Matogrossenses, S.A. | ICAO: PTN, Callsign: Pantanal, IATA Prefix: 961, Founded in 1990. Commenced operations in 1993. Merged with TAM on 26 March 2013. | BR | AVCODES |
| 6 | GP | APG Airlines | ICAO: RIV, Callsign: Riviera, | F | AVCODES |
| 7 | GP | GRAMPET SA | | RO | VKM |
| 8 | GPA | Kingman Aviation, Inc. d/b/a Golden Pacific Airlines | Callsign: Gold Pac, | USA | AVCODES |
| 9 | GPA | Golden Pacific Airlines | | | ICAO1 |
| 10 | GPA | GEORGIA PORT AUTHORITY | | | PWRC |
| 11 | GPAB | GP TRANSPORTATION CO | | | SCAC4 |
| 12 | GPAC | GLOBAL PACIFIC MANAGEMENT LTD | | | SCAC4 |
| 13 | GPAD | GLI PROPERTIES AND DEVELOPMENT LLC | | | SCAC4 |
| 14 | GPAL | GEORGIA PACK AND LOAD MOVING AND ST | | | SCAC4 |
| 15 | GPAL | Grant Palmer | | GB | TRAFFIC |
| 16 | GPAP | GRUPO PAPELERAMA SA DE CV | | | SCAC4 |
| 17 | GPAS | GULF PARCEL SERVICE | | | SCAC4 |
| 18 | GPAT | GARRIGAN, PATRICK A TRUCKING INC | | | SCAC4 |
| 19 | GPAU | ACUGREEN LTD | | | SCAC3 |
| 20 | GPAU | VORONEZHGAZSTROYSE | | | SCAC4 |
| 21 | GPBC | GORDON TRUCKING INC (GP BRITISH COL | | | SCAC4 |
| 22 | GPBK | G & P TRUCKING COMPANY INC | | | SCAC4 |
| 23 | GPBM | GROUPE IBERVILLE PERFORMANCE MARINE | | | SCAC4 |
| 24 | GPBX | Georgia-Pacific West, Inc. | added 4/1995 | | NAKINA |
| 25 | GPBX | Georgia-Pacific Corp. | 7/2000; eliminated 4/2005 | | NAKINA |
| 26 | GPBX | Georgia-Pacific Corp., Bellingham Division | added 7/1977; 1/1980-1/1994; eliminated 4/1995 | | NAKINA |
| 27 | GPBX | General American Transportation Corp. | added 1/1960; 4/1961-4/1970; eliminated 7/1973 | | NAKINA |
| 28 | GPBX | Piggy-Back Inc. | eliminated 1/1960 | | NAKINA |
| 29 | GPBX | Piggy-Bank Inc., subsidiary of General American Transportation Corp. | added 10/1958 | | NAKINA |
| 30 | GPBX | Piggy-Bank Inc., subsidiary of General American Transportation Corp. | added 10/58 | | NRHS |
| 31 | GPBX | Piggy-Back Inc. | eliminated 1/60 | | NRHS |
| 32 | GPBX | General American Transportation Corp. | added 1/60; 4/61-4/70; eliminated 7/73 | | NRHS |
| 33 | GPBX | Georgia-Pacific Corp., Bellingham Division | added 7/77; 1/80-1/94; eliminated 4/95 | | NRHS |
| 34 | GPBX | Georgia-Pacific West, Inc. | added 4/95 | | NRHS |
| 35 | GPBX | Georgia-Pacific Corp. | Jul-00 | | NRHS |
| 36 | GPBX | *GENERAL AMERICAN TRQANSPORTATION CORP., PIGGY-BACK, INC. | | | PWRC |
| 37 | GPBX | *GEORGIA-PACIFIC CORP., BELLINGHAM DIV. | | | PWRC |
| 38 | GPBX | Georgia-Pacific Corporation | | | RSRV |
| 39 | GPC | Gulf Pearl Air Lines | Callsign: Air Gulfpearl, | LAR | AVCODES |
| 40 | GPC | Gulf Pearl Air Lines | | | ICAO1 |
| 41 | GPC | GEORGIA-PACIFIC CORPORATION | | | PWRC |
| 42 | GPCA | GROTON PACIFIC CARRIERS INC | | | SCAC4 |
| 43 | GPCC | GROUPE CANAM INC | | | SCAC4 |
| 44 | GPCD | GREEN, PAT CARDERS LTD | | | SCAC4 |
| 45 | GPCE | GLAZIER PACKING CO INC | | | SCAC4 |
| 46 | GPCF | GPC AFRAMAX CORPORATION | | | SCAC4 |
| 47 | GPCH | GOWELLS PATRIOT CASH FUELS | | | SCAC4 |
| 48 | GPCI | GRANITE PRECASTING & CONCRETE, INC | | | SCAC4 |
| 49 | GPCM | GEORGIA-PACIFIC CONSUMER PRODUCTS L | | | SCAC4 |
| 50 | GPCO | GLOBAL RECYCLING TRANSPORTATION LLC | | | SCAC4 |
| 51 | GPCP | GPCO INC | | | SCAC4 |
| 52 | GPCS | GLASMAN, J TRANSPORT | | | SCAC4 |
| 53 | GPCT | GEODYNE TRANSPORT | | | SCAC4 |
| 54 | GPCU | EBS GPG ARIA FZE | | UAE | BIC |
| 55 | GPCX | Georgia-Pacific Corp. | 7/2000-7/2005; eliminated 4/2007 | | NAKINA |
| 56 | GPCX | Georgia-Pacific Corp., Container Division | added 7/1990; 1/1994 | | NAKINA |
| 57 | GPCX | General Electric Co., General Purpose Control Dept. | added 1/1982; eliminated 4/1987 | | NAKINA |
| 58 | GPCX | General Electric Co. | added 7/1965; 7/1965-1/1975; eliminated 10/1975; 1/1980 | | NAKINA |
| 59 | GPCX | Mobil Oil Co., a Division of Soncony Mobil Oil Co., Inc. | added 1/1960; 4/1961; eliminated 10/1961 | | NAKINA |
| 60 | GPCX | General Petroleum Corp. | 4/1947-10/1957; eliminated 1/1960 | | NAKINA |
| 61 | GPCX | General Petroleum Corp. of California | 7/1935-1/1946 | | NAKINA |
| 62 | GPCX | General Petroleum Corp. (General Petroleum Corp. of California) | 7/1930-7/1935 | | NAKINA |
| 63 | GPCX | General Petroleum Corp. | 8/1920-7/1923 | | NAKINA |
| 64 | GPCX | General Petroleum Corp. of California | Apr-38 | | NRHS |
| 65 | GPCX | General Petroleum Corp. | 1/52-10/57; eliminated 1/60 | | NRHS |
| 66 | GPCX | Mobil Oil Co., a Division of Soncony Mobil Oil Co., Inc. | added 1/60 | | NRHS |
| 67 | GPCX | Socony Mobil Oil Co., Inc. | Apr-61 | | NRHS |
| 68 | GPCX | General Electric Co. | added 7/65; 7/65-1/80 | | NRHS |
| 69 | GPCX | General Electric Co., General Purpose Control Dept. | added 1/82; eliminated 4/87 | | NRHS |
| 70 | GPCX | Georgia-Pacific Corp., Container Division | added 7/90; 1/94 | | NRHS |
| 71 | GPCX | Georgia-Pacific Corp. | Jul-00 | | NRHS |
| 72 | GPCX | *MOBIL OIL CO. {GENERAL PETROLEUM CORP.] | | | PWRC |
| 73 | GPCX | *GENERAL ELECTRIC CO., GENERAL PURPOSE CONTROL DEPT. | | | PWRC |
| 74 | GPCX | *GEORGIA PACIFIC CORPORATION, CONTAINER DIVISION | | | PWRC |
| 75 | GPCX | Georgia-Pacific Corporation | | | RSRV |
| 76 | GPCY | GRAND FALLS PALLETS LTD | | | SCAC4 |
| 77 | GPD | Tradewind Aviation LLC | IATA: TJ, | USA | AVCODES |
| 78 | GPD | Tradewind Aviation | | | ICAO1 |
| 79 | GPDC | GRUPO DANTA CN | | | SCAC4 |
| 80 | GPDD | GENUINE PARTS DISTRIBUTORS DIV OF T | | | SCAC4 |
| 81 | GPDF | GOLDEN PACIFIC TRANSPORT LLC | | | SCAC4 |
| 82 | GPDQ | G & P DISTRIBUTING INC | | | SCAC4 |
| 83 | GPDR | GARZA PESINA, DESIDERIO | | | SCAC4 |
| 84 | GPDU | PETROLESPORT JSC | | RUS | BIC |
| 85 | GPDX | General American Marks Co. | added 10/1998; 7/2000-7/2005 | | NAKINA |
| 86 | GPDX | General American Marks Co. | added 10/98; 7/2000 | | NRHS |
| 87 | GPDX | GENERAL AMERICAN MARKS COMPANY | | | PWRC |
| 88 | GPDX | General American Marks (GATX Corporation) | | | RSRV |
| 89 | GPDX | GENERAL AMERICAN MARKS COMPANY | | | SCAC4 |
| 90 | GPE | GP Express Airlines, Inc. | Callsign: Regional Express, | USA | AVCODES |
| 91 | GPE | GP Express Airlines | | | ICAO1 |
| 92 | GPEA | GRANITE PEAK TRANSPORTATION LLC | | | SCAC4 |
| 93 | GPEC | GRUPO ESCALANTE | | | SCAC4 |
| 94 | GPEF | GROUPE TARDIF INC | | | SCAC4 |
| 95 | GPEK | GO PLATINUM EXPRESS TRUCKING INC | | | SCAC4 |
| 96 | GPEP | GP EXPRESS | | | SCAC1 |
| 97 | GPEP | GARCES TRANSPORT | | | SCAC4 |
| 98 | GPEQ | G P EXPRESS INC | | | SCAC4 |
| 99 | GPES | GRAPEVINE EXPRESS | | | SCAC1 |
| 100 | GPET | GENERAL PETROLEUM | | | SCAC4 |
