| 1 | MMR | Monair SA | Callsign: Monair, | CH | AVCODES |
| 2 | MMR | Musrata Air Transport | | | ICAO1 |
| 3 | MMR | MINNESOTA & MANITOBA RAILROAD | | | PWRC |
| 4 | MMR | MMRailservice GmbH | | DE | VKM |
| 5 | MMRC | M & M TRUCKING | | | SCAC4 |
| 6 | MMRD | M S M TRANSPORT INC | | | SCAC4 |
| 7 | MMRG | MARTIN, THOMAS E TRUCKING | | | SCAC4 |
| 8 | MMRL | M M RANCH | | | SCAC4 |
| 9 | MMRM | MCR MICROCOMPUTER RENTALS | | | SCAC4 |
| 10 | MMRO | MONTEMAY | | | SCAC4 |
| 11 | MMRR | Mid-Michigan R.R., Inc. | added 4/1988; 1/1994-7/2005 | | NAKINA |
| 12 | MMRR | Mid-Michigan R.R., Inc. | added 4/88; 1/94-7/2000 | | NRHS |
| 13 | MMRR | MID-MICHIGAN RAILROAD, INC. | | | PWRC |
| 14 | MMRR | Mid-Michigan Railroad | | | RSRV |
| 15 | MMRR | MID-MICHIGAN RAILROAD INC | | | SCAC4 |
| 16 | MMRR | Mid Michigan Railroad | | USA | TRAFFIC |
| 17 | MMRS | MMR EXPRESS INC | | | SCAC4 |
| 18 | MMRT | MMRC TRUCKING INC | | | SCAC4 |
| 19 | MMRTC | Makkah Mass Rail Transit Company | | SA | TRAFFIC |
| 20 | MMRU | MAINSTREAM ENGINEERING CORPORATION | | USA | BIC |
| 21 | MMRW | M & M TRUCKING INC | | | SCAC4 |
| 22 | MMRX | Double M Ranch Enterprises | 1/1994-7/2005 (not listed) | | NAKINA |
| 23 | MMRX | McMurrey Refining Co. | 7/1937 (not listed) | | NAKINA |
| 24 | MMRX | Double M Ranch Enterprises | 1/94-7/2000 | | NRHS |
| 25 | MMRX | *MCMURREY REFINING CO. | | | PWRC |
| 26 | MMRX | +DOUBLE M RANCH ENTERPRISES | | | PWRC |
| 27 | MMRX | Double M Ranch Enterprises | | | RSRV |
