| 1 | MGA | M G Aviacion, S.L. | Callsign: Mag Aviacion, | E | AVCODES |
| 2 | MGA | MG Aviacion | | | ICAO1 |
| 3 | MGA | Norfolk Southern Ry. Co. (Norfolk Southern) | 7/2000-7/2005 | | NAKINA |
| 4 | MGA | Consolidated Rail Corp. | added 7/1993; 1/1994; eliminated 7/1999 | | NAKINA |
| 5 | MGA | Monongahela Ry. Co. | 8/1920-10/1966 & 1/1975-1/1980; eliminated 7/1993 | | NAKINA |
| 6 | MGA | Monongahela Ry. Co. | 4/38-10/66 & 1/75-1/80; eliminated 7/93 | | NRHS |
| 7 | MGA | Consolidated Rail Corp. | added 7/93; 1/94; eliminated 7/99 | | NRHS |
| 8 | MGA | Norfolk Southern Ry. Co. (Norfolk Southern) | Jul-00 | | NRHS |
| 9 | MGA | NORFOLK SOUTHERN RWY [CONSOLIDATED RAIL CORP.; MONONGAHELA RY] | | | PWRC |
| 10 | MGA | Monongahela Railway (Norfolk Southern Railway) | | | RSRV |
| 11 | MGA | Monongahela Ry. Co. | | USA | TRAFFIC |
| 12 | MGAB | MGA LOGISTICS GROUP INC | | | SCAC4 |
| 13 | MGAC | Monongahela Connecting R.R. Co. | 7/1965-10/1966 | | NAKINA |
| 14 | MGAC | Monongahela Connecting R.R. Co. | 7/65-10/66 | | NRHS |
| 15 | MGAC | MONONGAHELA CONNECTING RAILROAD CO. | | | PWRC |
| 16 | MGAE | MEGA EXPRESS INC | | | SCAC4 |
| 17 | MGAH | MAPLE GROVE TOWING INC | | | SCAC4 |
| 18 | MGAJ | MEGA CARRIER CORPORATION | | | SCAC4 |
| 19 | MGAM | MORALES GARCIA, MARCOS | | | SCAC4 |
| 20 | MGAN | MORGAN OIL CORPORATION | | | SCAC4 |
| 21 | MGAP | MOUNTAIN MILK HAULING INC | | | SCAC4 |
| 22 | MGAQ | MARLOW, GERALD A | | | SCAC4 |
| 23 | MGAR | MCCALLUM, GARY | | | SCAC4 |
| 24 | MGAS | MORGAN SOUTHERN, INC | | | SCAC1 |
| 25 | MGAS | MORGAN SOUTHERN INC | | | SCAC4 |
| 26 | MGAT | MOGA TRANSPORT LTD | | | SCAC4 |
| 27 | MGAU | BONATESTA SRL | | | SCAC4 |
| 28 | MGAX | Moon Gasoline Co. | 7/1923-7/1932 | | NAKINA |
| 29 | MGAX | MOON GASOLINE CO. | | | PWRC |
