| 8401 | MTBU | MULTIBOXX LIMITED | | | SCAC4 |
| 8402 | MTBY | MAITLAND TRANSPORTATION SYSTEMS LTD | | | SCAC4 |
| 8403 | MTC | Minerva Airlines | IATA: N4, Callsign: Air Minerva, Ceased operations on 25 October 2003 due bankruptcy. IATA designator changed from Q2*, then changed from Q9* | I | AVCODES |
| 8404 | MTC | Minerva Airlines | IATA: Q2, Callsign: Air Minerva, IATA designator changed to Q9* | I | AVCODES |
| 8405 | MTC | Minerva Airlines | IATA: Q9, Callsign: Air Minerva, IATA designator changed from Q2*, then changed to N4 | I | AVCODES |
| 8406 | MTC | Mountain Air Company | IATA: N4 | | ICAO1 |
| 8407 | MTC | Boston and Maine Corp. | eliminated 1/1993 | | NAKINA |
| 8408 | MTC | Mystic Terminal Co. | 1/1975-1/1980 | | NAKINA |
| 8409 | MTC | Mystic Terminal Co. (Boston and Maine Corp.) | 7/1965-10/1966 | | NAKINA |
| 8410 | MTC | Mystic Terminal Co. | 1/1941-4/1961 | | NAKINA |
| 8411 | MTC | Mystic Terminal Co. (Boston and Maine Corp.) | 4/1938 | | NAKINA |
| 8412 | MTC | Mystic Terminal Co. (Boston and Maine R.R.) | 7/1930-7/1936 | | NAKINA |
| 8413 | MTC | Mystic Terminal Co. (Boston and Maine Corp.) | Apr-38 | | NRHS |
| 8414 | MTC | Mystic Terminal Co. | 1/52-4/61 | | NRHS |
| 8415 | MTC | Mystic Terminal Co. (Boston and Maine Corp.) | 7/65-10/66 | | NRHS |
| 8416 | MTC | Mystic Terminal Co. | 1/75-1/80 | | NRHS |
| 8417 | MTC | Boston and Maine Corp. | eliminated 1/93 | | NRHS |
| 8418 | MTC | *(BM)RETIRED 92-10-12 ATP (0467) [BOSTON & MAINE RR; MYSTIC TERMINAL CO.] | | | PWRC |
| 8419 | MTC | *MACKINAC TRANSPORTATION COMPANY | | | PWRC |
| 8420 | MTC | Mystic Terminal | | | RSRV |
| 8421 | MTC | MT CARGO SPEDITION | | SK | VKM |
| 8422 | MTCA | MAR-TRANS COMPANY | | | SCAC4 |
| 8423 | MTCB | MITTMAN CARRIERS INC | | | SCAC4 |
| 8424 | MTCG | MCTIER TRUCKING COMPANY INC | | | SCAC4 |
| 8425 | MTCH | MTL CONTAINER LINES | | | SCAC4 |
| 8426 | MTCI | MAPLE TANKER CORPORATION | | | SCAC4 |
| 8427 | MTCK | MATLACK INC. | | | SCAC1 |
| 8428 | MTCK | MILAS TRUCKING COMPANY INC | | | SCAC4 |
| 8429 | MTCL | MITCHELL, E STEWART INC | | | SCAC4 |
| 8430 | MTCO | Macon Terminal Co. | 1/1975-7/2005 | | NAKINA |
| 8431 | MTCO | Macon Terminal Co. | 1/75-7/2000 | | NRHS |
| 8432 | MTCO | MACON TERMINAL CO. | | | PWRC |
| 8433 | MTCO | Macon Terminal | | | RSRV |
| 8434 | MTCO | MICHAELS TRUCKING CORP | | | SCAC4 |
| 8435 | MTCQ | MTC BROKERAGE | | | SCAC4 |
| 8436 | MTCU | MERLION HOLDINGS PTE LTD | | SGP | BIC |
| 8437 | MTCU | MERLION HOLDINGS PTE LTD | | | SCAC4 |
| 8438 | MTCW | MYLES TRUCKING INC | | | SCAC4 |
| 8439 | MTCX | Mallard Transportation Co. | added 7/1961; 7/1965-7/2005 | | NAKINA |
| 8440 | MTCX | Texas Calgary Co. | added 7/1957; 10/1957; eliminated 1/1960 | | NAKINA |
| 8441 | MTCX | Texas Calgary Co. | 10/57; eliminated 1/60 | | NRHS |
| 8442 | MTCX | Mallard Transportation Co. | 7/65-7/2000 | | NRHS |
| 8443 | MTCX | *TEXAS CALGARY CO. | | | PWRC |
| 8444 | MTCX | +MALLARD TRANSPORTATION COMPANY | | | PWRC |
| 8445 | MTCX | Mallard Transportation | | | RSRV |
| 8446 | MTCX | MALLARD TRANSPORTATION COMPANY | | | SCAC4 |
| 8447 | MTCZ | *MATLACK TRANSPORTATION CO. | | | PWRC |
| 8448 | MTCZ | *MAYFLOWER TRANSIT & STORAGE | | | PWRC |
| 8449 | MTCZ | Mayflower Transit and Storage | | | RSRV |
| 8450 | MTCZ | MAYFLOWER TRANSIT & STORAGE | | | SCAC4 |
| 8451 | MTD | Macknight Airlines | | AUS | AVCODES |
| 8452 | MTD | MetroJets, LLC | IATA: 7N, Callsign: Matador, IATA Prefix: 007, | USA | AVCODES |
| 8453 | MTD | MacKnight Airlines | | | ICAO1 |
| 8454 | MTDA | MTL WORLDWODE AGENCY INC | | | SCAC4 |
| 8455 | MTDB | METROPOLITAN TRANSIT DEVELOPMENT BOARD | | | PWRC |
| 8456 | MTDD | MID-ATLANTIC TRANSPORTATION INC | | | SCAC4 |
| 8457 | MTDI | MITCO LIMITED | | | SCAC4 |
| 8458 | MTDJ | MIG TRANSPORT INC | | | SCAC4 |
| 8459 | MTDK | MTD TRUCKING | | | SCAC4 |
| 8460 | MTDO | METRO DELIVERY INC | | | SCAC4 |
| 8461 | MTDU | LLC «MODULTRANS» | | RUS | BIC |
| 8462 | MTDX | Midwest Transportation & Development Corp. | added 4/2001; eliminated 10/2002; 7/2005 (not listed) | | NAKINA |
| 8463 | MTDX | Midwest Transportation & Development Corp. | added 4/2001 | | NRHS |
| 8464 | MTDX | MIDWEST TRANSPORTATION & DEVELOPMENT CORP. | | | PWRC |
| 8465 | MTDX | Midwest Transportation and Development | | | RSRV |
| 8466 | MTDX | MIDWEST TRANSPORTATION & | | | SCAC4 |
| 8467 | MTE | Aeromet Linea Aerea, S.A. | Callsign: Aeromet, | RCH | AVCODES |
| 8468 | MTE | AirTran Airways, Inc. | IATA: FL, Callsign: Manatee, IATA Prefix: 332, ICAO designator changed to TRS | USA | AVCODES |
| 8469 | MTE | AirTran Airways, Inc. | IATA: FL, Callsign: Citurs, IATA Prefix: 332, ICAO designator changed to TRS | USA | AVCODES |
| 8470 | MTE | Aeromet Linea Aerea | | | ICAO1 |
| 8471 | MTE | MORRISTOWN & ERIE RAILROAD | | | PWRC |
| 8472 | MTEC | MUTSUTECH S A DE C V | | | SCAC4 |
| 8473 | MTEF | METCALF TRUCKING | | | SCAC4 |
| 8474 | MTEG | Muldentaleisenbahnverkehrsgesellschaft mbH | Meerane | D | privat-bahn.de |
| 8475 | MTEG | Muldental Eisenbahnverkehrsgesellschaft mbH. | | D | TRAFFIC |
| 8476 | MTEG | Muldental-Eisenbahnverkehrsgesellschaft mbH | | DE | VKM |
| 8477 | MTEJ | MINN-DAK TRANSPORT INC | | | SCAC4 |
| 8478 | MTEK | MATEER TRUCKING | | | SCAC4 |
| 8479 | MTEL | MARTEN TRANSPORT LTD (LOGISTICS DIV | | | SCAC4 |
| 8480 | MTEN | MARTEN TRANSPORT LTD | | | SCAC4 |
| 8481 | MTEO | MARITIME COMPANY FOR NAVIGATION, TH | | | SCAC4 |
| 8482 | MTEP | METRO EXPRESS | | | SCAC4 |
| 8483 | MTEQ | MOREN TRUCKING INC | | | SCAC4 |
| 8484 | MTER | METRO ENERGY | | | SCAC4 |
| 8485 | MTES | MARTELL TRUCKING ENTERPRISES INC | | | SCAC4 |
| 8486 | MTET | METRO EXPRESS INC | | | SCAC4 |
| 8487 | MTEU | BAYER AGRICULTURE BVBA | | B | BIC |
| 8488 | MTEU | MONSANTO EUROPE N V | | | SCAC4 |
| 8489 | MTEV | MTE TRUCKING LLC | | | SCAC4 |
| 8490 | MTEW | MIDWEST TRANSPORT INC | | | SCAC4 |
| 8491 | MTEX | Michigan Tanning & Extract Co. | 8/1920-7/1923 | | NAKINA |
| 8492 | MTEX | MICHIGAN TANNING & EXTRACT CO. | | | PWRC |
| 8493 | MTF | Interjet | Callsign: Interjet, | I | AVCODES |
| 8494 | MTF | Interjet | | | ICAO1 |
| 8495 | MTFE | MURRAYS TRANSFER AND STORAGE INC | | | SCAC4 |
| 8496 | MTFF | MISKA TRAILER FACTORY | | | SCAC4 |
| 8497 | MTFH | MOODY MOVING & STORAGE INC | | | SCAC4 |
| 8498 | MTFL | MARCHAND TRUCK & FLOAT | | | SCAC4 |
| 8499 | MTFM | MORRIS TRANSFER | | | SCAC1 |
| 8500 | MTFP | M T EXPRESS | | | SCAC4 |
