| 8501 | MTFR | The Minnesota Transfer Ry. Co. | 1/1975-1/1980 | | NAKINA |
| 8502 | MTFR | The Minnesota Transfer Ry. Co. | 1/75-1/80 | | NRHS |
| 8503 | MTFR | MINNESOTA TRANSFER RAILWAY CO. | | | PWRC |
| 8504 | MTFR | Minnesota Transfer Railway | | | RSRV |
| 8505 | MTFR | MULLEN TRANSFER AND STORAGE INC | | | SCAC4 |
| 8506 | MTFS | MARC TRANS INC | | | SCAC4 |
| 8507 | MTFT | MOTOR FREIGHT CONSOLIDATION INC | | | SCAC4 |
| 8508 | MTFY | METROPOLITAN TRANSFER CORPORATION | | | SCAC4 |
| 8509 | MTG | Servicios Aereos M.T.T., S.A. de C.V. | | MEX | AVCODES |
| 8510 | MTG | Servicios Aereos MTT | | | ICAO1 |
| 8511 | MTGA | MUSTANG LOGISTICS INC | | | SCAC4 |
| 8512 | MTGB | MTGLOBAL INC | | | SCAC4 |
| 8513 | MTGC | MOUNTAINEER COACH INC | | | SCAC4 |
| 8514 | MTGD | M & T LOGISTICS INC | | | SCAC4 |
| 8515 | MTGF | MARQUIS TRANSPORTATION LLC | | | SCAC4 |
| 8516 | MTGO | MINGUER TRANSPORT | | | SCAC4 |
| 8517 | MTGQ | MARK TRUCKING & RIGGING LLC | | | SCAC4 |
| 8518 | MTGR | MARITIME LOGISTICS GROUP INC | | | SCAC4 |
| 8519 | MTGT | MARTI TRUCKING CORP | | | SCAC4 |
| 8520 | MTGU | MATHESON TRI-GAS INC | | USA | BIC |
| 8521 | MTGU | Matheson Tri-Gas | | | RSRV |
| 8522 | MTGU | C.I.M.I. MONTUBI | | | SCAC3 |
| 8523 | MTGU | MATHESON TRI-GAS INC | | | SCAC4 |
| 8524 | MTGY | MILLER TRANSPORT GROUP LLC | | | SCAC4 |
| 8525 | MTH | Massachusetts Institute Of Technology | Callsign: Research, | USA | AVCODES |
| 8526 | MTH | Massachusetts Institute of Technology | | | ICAO1 |
| 8527 | MTHB | MIKES TRANSPORTATION SERVICE INC | | | SCAC4 |
| 8528 | MTHB | Mittelthurgaubahn | | CH | TRAFFIC |
| 8529 | MTHB | Verein Historische Mittel-Thurgau-Bahn (MThB) | | CH | VKM |
| 8530 | MTHH | MOTHER-EASE INC | | | SCAC4 |
| 8531 | MTHI | MASTERS TRANSPORTATION LLC | | | SCAC4 |
| 8532 | MTHK | MERCHANTS TRANSPORT OF HICKORY, INC | | | SCAC1 |
| 8533 | MTHK | MERCHANTS TRANSPORT OF HICKORY INC | | | SCAC4 |
| 8534 | MTHP | MATHESON | | | SCAC4 |
| 8535 | MTHR | MARATHON TRANSPORT INC | | | SCAC4 |
| 8536 | MTHS | MTS | | | SCAC4 |
| 8537 | MTHT | MATHER TRUCKING INC | | | SCAC4 |
| 8538 | MTHU | MONGOLIAN ISRAEL JOINT VENTURE | | | SCAC4 |
| 8539 | MTHV | MCARTHUR EXPRESS (DIV OF TFI TRANSP | | | SCAC4 |
| 8540 | MTHW | MACHINE TRANSPORT INC | | | SCAC4 |
| 8541 | MTHY | MIDLAND TECHNOLOGY INC | | | SCAC4 |
| 8542 | MTI | Arturo Rodriguez Martinez | Callsign: Martinez, | MEX | AVCODES |
| 8543 | MTI | Monerrey Air Taxi | | | ICAO1 |
| 8544 | MTIE | MULTI TRANSPORT | | | SCAC4 |
| 8545 | MTIF | MILLS, TERRY TRUCKING LTD | | | SCAC4 |
| 8546 | MTIG | MATHESON TRI-GAS INC | | | SCAC4 |
| 8547 | MTIH | MACA TRANSPORT | | | SCAC4 |
| 8548 | MTII | MAPLE TRANSPORT INTERNATIONAL INC | | | SCAC4 |
| 8549 | MTIK | MI TRANSPORT INC | | | SCAC4 |
| 8550 | MTIP | M T I, INC | | | SCAC1 |
| 8551 | MTIP | M T I INC | | | SCAC4 |
| 8552 | MTIQ | MANITO TRANSIT CO | | | SCAC1 |
| 8553 | MTIQ | MANITO TRANSIT CO | | | SCAC4 |
| 8554 | MTIU | MILLER INTERMODAL LOGISTICS SERVICES INC | | USA | BIC |
| 8555 | MTIU | WELFIT ODDY (PTY) LTD. | | | PWRC |
| 8556 | MTIU | Miller Intermodal Logistics Services | | | RSRV |
| 8557 | MTIU | MILLER TRANSPORTERS INC | | | SCAC4 |
| 8558 | MTIW | MARIO TRUCKING INC | | | SCAC4 |
| 8559 | MTIX | MIRANT ENERGY TRADING LLC | | | SCAC4 |
| 8560 | MTIZ | *AMERICAN MARINE INDUSTRIES | | | PWRC |
| 8561 | MTIZ | *MISSISSIPPI TRANSPORTATION INC. | | | PWRC |
| 8562 | MTIZ | Mississippi Transportation Inc. (American Marine Industries) | | | RSRV |
| 8563 | MTIZ | AMERICAN MARINE INDUSTRIES | | | SCAC4 |
| 8564 | MTJ | Metrojet Limited | Callsign: Metrojet, | HK | AVCODES |
| 8565 | MTJ | Metrojet | | | ICAO1 |
| 8566 | MTJ | Maribo - Torrig Jernbane (Torrigbanen) | 1924 - 1941 | DK | jernbanen.dk |
| 8567 | MTJ | Malmö - Trelleborg Järnväg | 1886 - 1943 | S | svenska-lok.se |
| 8568 | MTJ | Maribo - Torrig Jernbane (Torrigbanen) | 1924 - 1941 | DK | TRAFFIC |
| 8569 | MTJB | MCDERMOTT, T J TRANSPORTATION CO IN | | | SCAC4 |
| 8570 | MTJD | MIDWEST TRANSPORT INC | | | SCAC4 |
| 8571 | MTJF | MACDOUGAL TRANSPORT INC | | | SCAC4 |
| 8572 | MTJG | MORAN TRANSPORTATION CORPORATION | | | SCAC4 |
| 8573 | MTJI | MARINE TRANSPORT INC | | | SCAC4 |
| 8574 | MTJK | MASTRONARDI TRANSPORT INC | | | SCAC4 |
| 8575 | MTJQ | MAGIC TRANSPORT INC | | | SCAC4 |
| 8576 | MTJT | MT TRUCKING | | | SCAC4 |
| 8577 | MTJV | MCBAY TRUCKING CO INC | | | SCAC4 |
| 8578 | MTJW | MATHIS TRANSPORTATION | | | SCAC4 |
| 8579 | MTK | Air Metack, Lda | Callsign: Airmetack, | ANG | AVCODES |
| 8580 | MTK | Air Metack | | | ICAO1 |
| 8581 | MTKB | MARINE TRUCK SERVICE INC | | | SCAC4 |
| 8582 | MTKD | MAP TRUCKING | | | SCAC4 |
| 8583 | MTKG | MIAMI TRUCKING INC | | | SCAC4 |
| 8584 | MTKH | MOBAL TRUCKING INC | | | SCAC4 |
| 8585 | MTKI | MATHY TRUCKING INC | | | SCAC4 |
| 8586 | MTKJ | MARATHON TRUCKING LLC | | | SCAC4 |
| 8587 | MTKL | MARTINEZ TRUCKLINE | | | SCAC4 |
| 8588 | MTKM | METAL TRUCKING SERVICE INC | | | SCAC4 |
| 8589 | MTKN | MASON, TOM, TRUCKING | | | SCAC1 |
| 8590 | MTKN | MULTI TASKERS LIMITED LIABILITY COM | | | SCAC4 |
| 8591 | MTKQ | MCCLURE TRUCKING | | | SCAC4 |
| 8592 | MTKR | MANDER TRUCKLINES INC | | | SCAC4 |
| 8593 | MTKU | PT MASAJI TATANAN KONTAINER INDONESIA | | RI | BIC |
| 8594 | MTKW | MCILVAINE TRUCKING INTERNATIONAL IN | | | SCAC4 |
| 8595 | MTKX | SANTA CLARITA RAILWAY [METRO LINK] | | | PWRC |
| 8596 | MTKY | MARLO TRUCKING INC | | | SCAC4 |
| 8597 | MTL | RAF-Avia | IATA: MT, Callsign: Mitavia, Established on 31 October 1990. Commenced operations on 19 August 1991. | LV | AVCODES |
| 8598 | MTL | RAF-Avia | | | ICAO1 |
| 8599 | MTL | MONTANA LINES COMMITTEE | | | SCAC4 |
| 8600 | MTL | MTL London Northern | City: London | GB | TRAFFIC |
