| 1 | GPL | DLR Deutsche Forschungsanstalt Fur Luft Und Raumfahfit, Braunschweig | Callsign: German Polar, | D | AVCODES |
| 2 | GPL | DLR | | | ICAO1 |
| 3 | GPL | GP'S LIMOUSINE/CORPORATE CAR SERVIC | | | SCAC4 |
| 4 | GPLA | GREGOIRE, PAUL LTD | | | SCAC4 |
| 5 | GPLG | GP LOGISTICS INC | | | SCAC4 |
| 6 | GPLK | GPL TRUCKING INC | | | SCAC4 |
| 7 | GPLL | G P LOGISTICS INC | | | SCAC4 |
| 8 | GPLR | GREAT LAKES PETROLEUM | | | SCAC4 |
| 9 | GPLU | MANAGEMENT CONTROL & MAINTENANCE S.A. | | CH | BIC |
| 10 | GPLU | MANAGEMENT CONTROL & MAINTENANCE S.A. | | | PWRC |
| 11 | GPLU | Management Control and Maintenance | | | RSRV |
| 12 | GPLU | MANAGEMENT CONTROL & MAINTENANCE S | | | SCAC4 |
| 13 | GPLW | GLOBAL PARTNER LOGISTICS INC | | | SCAC4 |
| 14 | GPLX | General American Marks Co. | added 1/1998; 7/2000-7/2005 | | NAKINA |
| 15 | GPLX | General American Transportation Corp. | added 10/1992; 1/1994; eliminated 1/1998 | | NAKINA |
| 16 | GPLX | Getz Poultry and Egg Corp. | 7/1937-4/1938 | | NAKINA |
| 17 | GPLX | Getz Live Poultry Car Corp. | 7/1935 | | NAKINA |
| 18 | GPLX | Getz Poultry and Egg Corp. | Apr-38 | | NRHS |
| 19 | GPLX | General American Transportation Corp. | added 10/92; 1/94; eliminated 1/98 | | NRHS |
| 20 | GPLX | General American Marks Co. | added 1/98; 7/2000 | | NRHS |
| 21 | GPLX | *GETX POULTRY & EGG CORP. | | | PWRC |
| 22 | GPLX | +GENERAL AMERICAN MARKS CO. [GENERAL AMERICAN TRANSPORTATION CORP.] | | | PWRC |
| 23 | GPLX | General American Marks (GATX Corporation) | | | RSRV |
| 24 | GPLZ | GOOD PASTURE LEAD | | | PWRC |
