| 1 | MGR | Magna Air GES.m.b.H. | Callsign: Magna Air, | A | AVCODES |
| 2 | MGR | Magna Air | | | ICAO1 |
| 3 | MGRA | MAGRA, INC | | | SCAC1 |
| 4 | MGRA | MAGRA INC | | | SCAC4 |
| 5 | MGRB | MCGUIRE TRANSPORTATION INC | | | SCAC4 |
| 6 | MGRC | MORGAN CREEK TROPICALS LTD | | | SCAC4 |
| 7 | MGRD | MAAG, RS TRANSPORTATION LLC | | | SCAC4 |
| 8 | MGRE | MGR EXPRESS INC | | | SCAC4 |
| 9 | MGRH | MCNELLY, GARY INC | | | SCAC4 |
| 10 | MGRI | MG Rail, Inc. | added 10/1985; 1/1994-7/2000; eliminated 4/2004; 7/2005 | | NAKINA |
| 11 | MGRI | MG Rail, Inc. | 1/94-7/2000 | | NRHS |
| 12 | MGRI | M. G. RAIL, INC. | | | PWRC |
| 13 | MGRI | MG Rail | | | RSRV |
| 14 | MGRQ | MAGREGOR TRANSPORTATION SERVICES IN | | | SCAC4 |
| 15 | MGRS | Ferrocarrils Nacionales de Mexico (National Rys. of Mexico) | 1/1975-1/1980 | | NAKINA |
| 16 | MGRS | Ferrocarrils Nacionales de Mexico (National Rys. of Mexico) | 1/75-1/80 | | NRHS |
| 17 | MGRS | FERROCARRILES NACIONALES DE MEXICO | | | PWRC |
| 18 | MGRS | Ferrocarriles Nacionales de Mexico | | | RSRV |
| 19 | MGRS | MARITIMA DE GRANELES S A | | | SCAC4 |
| 20 | MGRU | MGR CONTAINER LINE PTE LTD | | | SCAC4 |
| 21 | MGRW | MORNING STAR LOGISTICS | | | SCAC4 |
| 22 | MGRY | MUNTER, GARY | | | SCAC4 |
| 23 | MGRZ | MERCHANT'S GRAIN RAIL, INC. | | | PWRC |
