| 1 | MAS | Malaysia Airlines System Berhad | IATA: MH, Callsign: Malaysian, IATA Prefix: 232, Name changed to Malaysia Airlines Berhad. Name changed from Malaysian Airlines Berhad (MAL) | MAL | AVCODES |
| 2 | MAS | Malaysia Airlines Berhad d/b/a Malaysia Airlines | IATA: MH, Callsign: Malaysian, IATA Prefix: 232, Name changed from Malaysia Airlines System Berhad. Name changed from Malaysian Airlines Berhad (MAL) | MAL | AVCODES |
| 3 | MAS | Malaysia Airlines | IATA: MH | | ICAO1 |
| 4 | MAS | Museumseisenbahn Ammerland-Satterland e.V. | Ocholt | D | privat-bahn.de |
| 5 | MAS | MARTIN SHAFFER | | | PWRC |
| 6 | MAS | MAS Special Engineering (BrightBus) | | GB | TRAFFIC |
| 7 | MASA | Malaysia Airlines (Penerbangan Malaysia) | Real: MAS | MAL | TRAFFIC |
| 8 | MASB | MITCHELL AND SONS TRUCKING | | | SCAC4 |
| 9 | MASE | MASTER AUTO TRANSPORT CORPORATION | | | SCAC4 |
| 10 | MASF | M A S LOGISTICS INC | | | SCAC4 |
| 11 | MASG | MASA TRUCKING CO | | | SCAC4 |
| 12 | MASI | METRO AIR SERVICES INC | | | SCAC4 |
| 13 | MASJ | MASTERSON, J CONSTRUCTION CORPORATI | | | SCAC4 |
| 14 | MaSJ | Marma - Sandarne Järnväg | 1858 - 1970 | S | svenska-lok.se |
| 15 | MASO | MILLER AND SONS TRUCKING LLC | | | SCAC4 |
| 16 | MASR | MASON, ROGER J LLC | | | SCAC4 |
| 17 | MASS | MASTER SHIPPNG LTD | | | SCAC4 |
| 18 | MASSBAY | Mass. Bay Transportation Authority | | USA | TRAFFIC |
| 19 | MAST | MARTIN, SAM TRUCKING INC | | | SCAC4 |
| 20 | MAST | Martin Schienentechnik KEG | | AT | VKM |
| 21 | MASU | MAS SHIPPING & TRADING | | ET | BIC |
| 22 | MASU | MAS LOGISTICS | | | SCAC4 |
| 23 | MASW | Mascot & Western R.R. Co. | 8/1920-7/1930 | | NAKINA |
| 24 | MASW | MASCOT & WESTERN RAILROAD CO. | | | PWRC |
| 25 | MASX | General Electric Railcar Services Corp. | added 1/1984; 1/1994; eliminated 10/1994 | | NAKINA |
| 26 | MASX | North American Car Corp. | added 4/1968; 4/1970-1/1980; eliminated 1/1984 | | NAKINA |
| 27 | MASX | North American Car Corp. | added 4/68; 4/70-1/80 | | NRHS |
| 28 | MASX | General Electric Railcar Services Corp. | 1/94; eliminated 10/94 | | NRHS |
| 29 | MASX | (NATX; NACC) GENERAL ELECTRIC RAILCAR SERVICES CORP. [MASONITE CORP. - LESSEE] | | | PWRC |
| 30 | MASX | GE Rail Services | | | RSRV |
| 31 | MASY | MARATHON PETROLEUM SUPPLY LLC | | | SCAC4 |
| 32 | MASZ | MAERSK SHIPPING | | | PWRC |
