| 4301 | MJ | Museiföreningen Munkedals Jernväg | | SE | VKM |
| 4302 | MJA | Almajara Aviation | Callsign: Majara, | SUD | AVCODES |
| 4303 | MJA | Markus Johannes Amrein | | CH | VKM |
| 4304 | MJAA | MARCHAND | | | SCAC4 |
| 4305 | MJAB | MIRON, JUAN ALFREDO | | | SCAC4 |
| 4306 | MJAC | M. J. A. CARTAGE, INC | | | SCAC1 |
| 4307 | MJAF | MARCHELLETTA, JOE TRUCKING | | | SCAC4 |
| 4308 | MJAH | MJ TRANSPORT LLC | | | SCAC4 |
| 4309 | MJAQ | MAJESTIC TRANSPORTATION | | | SCAC4 |
| 4310 | MJAW | MOOSE JAW TOYOTA | | | SCAC4 |
| 4311 | MJAWT | Moose Jaw Transit | | CDN | TRAFFIC |
| 4312 | MJAY | MJMILES TRUCKINE CO LLC | | | SCAC4 |
| 4313 | MJB | Magic Blue Airlines B.V | Callsign: Magic Blue, Filed for bankruptcy in December 2005. Name changed from Farnair Netherlands. | NL | AVCODES |
| 4314 | MJB | Magic Blue Airlines | | | ICAO1 |
| 4315 | MJBA | Midtjyske jernbaner A/S | | DK | VKM |
| 4316 | MjbaD | Midtjyske Jernbaner | 2008 - | DK | jernbanen.dk |
| 4317 | MJBAD | Midtjyske Jernbaner | 2008 - | DK | TRAFFIC |
| 4318 | MJBAD | Midtjyske Jernbaner Drift A/S | | DK | VKM |
| 4319 | MJBC | M J TRANSPORT | | | SCAC4 |
| 4320 | MJBF | MJB FREIGHT SYSTEMS, INC | | | SCAC1 |
| 4321 | MJBF | MJB FREIGHT SYSTEMS INC | | | SCAC4 |
| 4322 | MJC | Majestic Air P/L | IATA: 6M, Callsign: Zimbird, IATA Prefix: 066, Designator 6M recalled by IATA | ZW | AVCODES |
| 4323 | MJC | Mandarin Air Co., Ltd. | Designator 6M recalled by IATA | PRC | AVCODES |
| 4324 | MJCB | MARTIN, JAMES CHARLES | | | SCAC4 |
| 4325 | MJCK | MJC TRUCKING LLC | | | SCAC4 |
| 4326 | MJCL | MALJOHN COMPANY LTD | | | SCAC4 |
| 4327 | MJCM | MURPHY | | | SCAC4 |
| 4328 | MJCO | MAJO COUNTRY TRANSPORT | | | SCAC4 |
| 4329 | MJCP | MEUBLES J C PERREAULT | | | SCAC4 |
| 4330 | MJCT | MCKENZIE, JAY C TRANSPORT | | | SCAC4 |
| 4331 | MJDI | MORRIS, J D CONSTRUCTION COMPANY IN | | | SCAC4 |
| 4332 | MJDN | MARTIN, JOSEPH DISTRIBUTORS INC | | | SCAC4 |
| 4333 | MJDR | MICHALESKO, J D TRANSPORT | | | SCAC4 |
| 4334 | MJDT | M J D TRUCKING CO INC | | | SCAC4 |
| 4335 | MJE | Empire Aviation Group | Callsign: Emjet, | UAE | AVCODES |
| 4336 | MJEC | MALDONADO JARA, JOEL FRANCISCO | | | SCAC4 |
| 4337 | MJED | MCCOY, J EQUIPMENT LTD | | | SCAC4 |
| 4338 | MJEE | M J EXPRESS | | | SCAC4 |
| 4339 | MJEF | MORIARTY, JENNIFER | | | SCAC4 |
| 4340 | MJEG | M & J EXPRESS CARGO LLC | | | SCAC4 |
| 4341 | MJEL | MARTIN JR, ELAM L | | | SCAC4 |
| 4342 | MJEN | MATTJENN ENTERPRISES LTD | | | SCAC4 |
| 4343 | MJEP | M J ENTERPRISES | | | SCAC4 |
| 4344 | MJEQ | MARTINEZ, JAHANNA ENTERPRISES INC | | | SCAC4 |
| 4345 | MJES | MAJESTIC MARITIME LTD | | | SCAC4 |
| 4346 | MJEW | M J ENTERPRIZES LLC | | | SCAC4 |
| 4347 | MJF | Mjet GmbH | Callsign: Em-Express, | A | AVCODES |
| 4348 | MJFC | MAJOR FUEL CARRIERS CORP | | | SCAC4 |
| 4349 | MJFL | MAROTTI, J&S FARMS LLC | | | SCAC4 |
| 4350 | MJFO | MADRIGAL, J FREIGHT CO | | | SCAC4 |
| 4351 | MJGA | MAJESTIC RIGGING & TRANSPORTATION L | | | SCAC4 |
| 4352 | MJGI | MACLELLAN, JOHN G INC | | | SCAC4 |
| 4353 | MJGT | M & J GARAGE AND TOWING INC | | | SCAC4 |
| 4354 | MJGX | M.J. Goodrich Co. (North Western Refrigerator Line Co.) | 7/1935 | | NAKINA |
| 4355 | MJGX | M.J. Goodrich | 7/1932 | | NAKINA |
| 4356 | MJGX | M.J. GOODRICH | | | PWRC |
| 4357 | MJHF | MJ HEALTHFOOD LTD | | | SCAC4 |
| 4358 | MJHK | MICHAELS, JOHN TRUCKING | | | SCAC4 |
| 4359 | MJHT | MANNING, JUDGE HORSE TRANSPORTATION | | | SCAC4 |
| 4360 | MJI | Majestic Jet, Inc | Callsign: Majestic Jet, | USA | AVCODES |
| 4361 | MJIC | M & J INTERMODAL LLC | | | SCAC4 |
| 4362 | MJIE | MJ IMPORT & EXPORT | | | SCAC4 |
| 4363 | MJIL | MAJESTIC INDUSTRIES CANADA LTD | | | SCAC4 |
| 4364 | MJIM | MARTIN, JIM TRUCKING | | | SCAC4 |
| 4365 | MJIT | MAJIC TRUCKING LLC | | | SCAC4 |
| 4366 | MJJJ | MAYER, JUSTIN J | | | SCAC4 |
| 4367 | MJJK | MOMJIAN, J TRUCKING | | | SCAC4 |
| 4368 | MJKI | MAJK TRUCKING | | | SCAC4 |
| 4369 | MJKJ | MAJOR TRUCKING LLC | | | SCAC4 |
| 4370 | MJKL | MJ TANK LINES | | | SCAC4 |
| 4371 | MJKM | M & J TRUCKING | | | SCAC4 |
| 4372 | MJKN | M.R.J. TRUCKING, INC | | | SCAC1 |
| 4373 | MJKN | M R J TRUCKING INC | | | SCAC4 |
| 4374 | MJKP | MAJK TRANSPORT INC | | | SCAC4 |
| 4375 | MJKR | M J K RIGGING AND | | | SCAC4 |
| 4376 | MJKT | MAJESTIK TRUCKING INC | | | SCAC4 |
| 4377 | MJL | Jet Line International Ltd. | Callsign: Moldjet, | MD | AVCODES |
| 4378 | MJL | Jet Line International | | | ICAO1 |
| 4379 | MJLB | MAD J LOGISTICS | | | SCAC4 |
| 4380 | MJLD | MOWINCKELS, J LUDWIG | | | SCAC4 |
| 4381 | MJLG | M & J LOGISTICS INC | | | SCAC4 |
| 4382 | MJLI | M & J LOGISTICS INC | | | SCAC4 |
| 4383 | MJLK | MOSES, J L TRUCKING | | | SCAC4 |
| 4384 | MJLQ | MJ LOGISTICS INC | | | SCAC4 |
| 4385 | MJLT | MARTIN, JOE, LOGGING&TRUCKING, INC | | | SCAC1 |
| 4386 | MJM | ETI 2000 | Callsign: Elco Eti, | I | AVCODES |
| 4387 | MJM | Eti 2000 | | | ICAO1 |
| 4388 | MJMA | MJM TRUCKING LLC | | | SCAC4 |
| 4389 | MJMC | MCCONKEY | | | SCAC4 |
| 4390 | MJMD | MJM LOGISTICS LLC | | | SCAC4 |
| 4391 | MJME | MASON, JAMES ENTERPRISES INC | | | SCAC4 |
| 4392 | MJMF | MJM TRUCKING | | | SCAC4 |
| 4393 | MJMH | MARTIN, JOEL M HATCHERY | | | SCAC4 |
| 4394 | MJMJ | MAST, J J TRUCKING INC | | | SCAC4 |
| 4395 | MJMM | MJM TRUCKING INC | | | SCAC4 |
| 4396 | MJMQ | MJM QUALITY TRANSPORTATION INC | | | SCAC4 |
| 4397 | MJMR | M J MOVING AND STORAGE | | | SCAC4 |
| 4398 | MJMS | MCNEILL, JAMES TRUCKING LLC | | | SCAC4 |
| 4399 | MJMY | MAYES | | | SCAC4 |
| 4400 | MJN | Royal Air Force Of Oman (Air Transport) | Callsign: Majan, | OM | AVCODES |
