| 1 | MJ | Lineas Aereas Privadas Argentinas (LAPA) | ICAO: LPR, Callsign: Lapa, IATA Prefix: 069, Name changed to ARG L�nea Privada Argentina on 27 September 2001. | RA | AVCODES |
| 2 | MJ | Manchester Airport Agencies | | GB | AVCODES |
| 3 | MJ | Mihin Lanka (Pvt) Ltd. | ICAO: MLR, Callsign: Mihin Lanka, Ceased operations on 30 October 2016. | CL | AVCODES |
| 4 | MJ | M & N Equipment, LLC d/b/a M & N Aviation | ICAO: JNH, Callsign: Jonah, Designator MJ* recalled by IATA. | USA | AVCODES |
| 5 | MJ | ARG Línea Privada Argentina | ICAO: LPR, Callsign: Lapa, IATA Prefix: 069, Name changed from Lineas Aereas Privadas Argentinas (LAPA) on 27 September 2001. Ceased operations in April 2003. | RA | AVCODES |
| 6 | MJ | MyWay Airlines Co., Ltd. | ICAO: MYW, Callsign: My Sky, Commenced operations on 31 March 2018. | GE | AVCODES |
| 7 | MJ | Manufacturers' Junction Ry. Co. | 8/1920-7/2005; eliminated 1/2006 | | NAKINA |
| 8 | MJ | Manufacturers' Junction Ry. Co. | 4/38-7/2000 | | NRHS |
| 9 | MJ | MANUFACTURERS JUNCTION RAILWAY CO. | | | PWRC |
| 10 | MJ | Manufacturers' Junction Railway | | | RSRV |
| 11 | MJ | Museiföreningen Munkedals Jernväg | | SE | VKM |
| 12 | MJA | Almajara Aviation | Callsign: Majara, | SUD | AVCODES |
| 13 | MJA | Markus Johannes Amrein | | CH | VKM |
| 14 | MJAA | MARCHAND | | | SCAC4 |
| 15 | MJAB | MIRON, JUAN ALFREDO | | | SCAC4 |
| 16 | MJAC | M. J. A. CARTAGE, INC | | | SCAC1 |
| 17 | MJAF | MARCHELLETTA, JOE TRUCKING | | | SCAC4 |
| 18 | MJAH | MJ TRANSPORT LLC | | | SCAC4 |
| 19 | MJAQ | MAJESTIC TRANSPORTATION | | | SCAC4 |
| 20 | MJAW | MOOSE JAW TOYOTA | | | SCAC4 |
| 21 | MJAWT | Moose Jaw Transit | | CDN | TRAFFIC |
| 22 | MJAY | MJMILES TRUCKINE CO LLC | | | SCAC4 |
| 23 | MJB | Magic Blue Airlines B.V | Callsign: Magic Blue, Filed for bankruptcy in December 2005. Name changed from Farnair Netherlands. | NL | AVCODES |
| 24 | MJB | Magic Blue Airlines | | | ICAO1 |
| 25 | MJBA | Midtjyske jernbaner A/S | | DK | VKM |
| 26 | MjbaD | Midtjyske Jernbaner | 2008 - | DK | jernbanen.dk |
| 27 | MJBAD | Midtjyske Jernbaner | 2008 - | DK | TRAFFIC |
| 28 | MJBAD | Midtjyske Jernbaner Drift A/S | | DK | VKM |
| 29 | MJBC | M J TRANSPORT | | | SCAC4 |
| 30 | MJBF | MJB FREIGHT SYSTEMS, INC | | | SCAC1 |
| 31 | MJBF | MJB FREIGHT SYSTEMS INC | | | SCAC4 |
| 32 | MJC | Majestic Air P/L | IATA: 6M, Callsign: Zimbird, IATA Prefix: 066, Designator 6M recalled by IATA | ZW | AVCODES |
| 33 | MJC | Mandarin Air Co., Ltd. | Designator 6M recalled by IATA | PRC | AVCODES |
| 34 | MJCB | MARTIN, JAMES CHARLES | | | SCAC4 |
| 35 | MJCK | MJC TRUCKING LLC | | | SCAC4 |
| 36 | MJCL | MALJOHN COMPANY LTD | | | SCAC4 |
| 37 | MJCM | MURPHY | | | SCAC4 |
| 38 | MJCO | MAJO COUNTRY TRANSPORT | | | SCAC4 |
| 39 | MJCP | MEUBLES J C PERREAULT | | | SCAC4 |
| 40 | MJCT | MCKENZIE, JAY C TRANSPORT | | | SCAC4 |
| 41 | MJDI | MORRIS, J D CONSTRUCTION COMPANY IN | | | SCAC4 |
| 42 | MJDN | MARTIN, JOSEPH DISTRIBUTORS INC | | | SCAC4 |
| 43 | MJDR | MICHALESKO, J D TRANSPORT | | | SCAC4 |
| 44 | MJDT | M J D TRUCKING CO INC | | | SCAC4 |
| 45 | MJE | Empire Aviation Group | Callsign: Emjet, | UAE | AVCODES |
| 46 | MJEC | MALDONADO JARA, JOEL FRANCISCO | | | SCAC4 |
| 47 | MJED | MCCOY, J EQUIPMENT LTD | | | SCAC4 |
| 48 | MJEE | M J EXPRESS | | | SCAC4 |
| 49 | MJEF | MORIARTY, JENNIFER | | | SCAC4 |
| 50 | MJEG | M & J EXPRESS CARGO LLC | | | SCAC4 |
| 51 | MJEL | MARTIN JR, ELAM L | | | SCAC4 |
| 52 | MJEN | MATTJENN ENTERPRISES LTD | | | SCAC4 |
| 53 | MJEP | M J ENTERPRISES | | | SCAC4 |
| 54 | MJEQ | MARTINEZ, JAHANNA ENTERPRISES INC | | | SCAC4 |
| 55 | MJES | MAJESTIC MARITIME LTD | | | SCAC4 |
| 56 | MJEW | M J ENTERPRIZES LLC | | | SCAC4 |
| 57 | MJF | Mjet GmbH | Callsign: Em-Express, | A | AVCODES |
| 58 | MJFC | MAJOR FUEL CARRIERS CORP | | | SCAC4 |
| 59 | MJFL | MAROTTI, J&S FARMS LLC | | | SCAC4 |
| 60 | MJFO | MADRIGAL, J FREIGHT CO | | | SCAC4 |
| 61 | MJGA | MAJESTIC RIGGING & TRANSPORTATION L | | | SCAC4 |
| 62 | MJGI | MACLELLAN, JOHN G INC | | | SCAC4 |
| 63 | MJGT | M & J GARAGE AND TOWING INC | | | SCAC4 |
| 64 | MJGX | M.J. Goodrich Co. (North Western Refrigerator Line Co.) | 7/1935 | | NAKINA |
| 65 | MJGX | M.J. Goodrich | 7/1932 | | NAKINA |
| 66 | MJGX | M.J. GOODRICH | | | PWRC |
| 67 | MJHF | MJ HEALTHFOOD LTD | | | SCAC4 |
| 68 | MJHK | MICHAELS, JOHN TRUCKING | | | SCAC4 |
| 69 | MJHT | MANNING, JUDGE HORSE TRANSPORTATION | | | SCAC4 |
| 70 | MJI | Majestic Jet, Inc | Callsign: Majestic Jet, | USA | AVCODES |
| 71 | MJIC | M & J INTERMODAL LLC | | | SCAC4 |
| 72 | MJIE | MJ IMPORT & EXPORT | | | SCAC4 |
| 73 | MJIL | MAJESTIC INDUSTRIES CANADA LTD | | | SCAC4 |
| 74 | MJIM | MARTIN, JIM TRUCKING | | | SCAC4 |
| 75 | MJIT | MAJIC TRUCKING LLC | | | SCAC4 |
| 76 | MJJJ | MAYER, JUSTIN J | | | SCAC4 |
| 77 | MJJK | MOMJIAN, J TRUCKING | | | SCAC4 |
| 78 | MJKI | MAJK TRUCKING | | | SCAC4 |
| 79 | MJKJ | MAJOR TRUCKING LLC | | | SCAC4 |
| 80 | MJKL | MJ TANK LINES | | | SCAC4 |
| 81 | MJKM | M & J TRUCKING | | | SCAC4 |
| 82 | MJKN | M.R.J. TRUCKING, INC | | | SCAC1 |
| 83 | MJKN | M R J TRUCKING INC | | | SCAC4 |
| 84 | MJKP | MAJK TRANSPORT INC | | | SCAC4 |
| 85 | MJKR | M J K RIGGING AND | | | SCAC4 |
| 86 | MJKT | MAJESTIK TRUCKING INC | | | SCAC4 |
| 87 | MJL | Jet Line International Ltd. | Callsign: Moldjet, | MD | AVCODES |
| 88 | MJL | Jet Line International | | | ICAO1 |
| 89 | MJLB | MAD J LOGISTICS | | | SCAC4 |
| 90 | MJLD | MOWINCKELS, J LUDWIG | | | SCAC4 |
| 91 | MJLG | M & J LOGISTICS INC | | | SCAC4 |
| 92 | MJLI | M & J LOGISTICS INC | | | SCAC4 |
| 93 | MJLK | MOSES, J L TRUCKING | | | SCAC4 |
| 94 | MJLQ | MJ LOGISTICS INC | | | SCAC4 |
| 95 | MJLT | MARTIN, JOE, LOGGING&TRUCKING, INC | | | SCAC1 |
| 96 | MJM | ETI 2000 | Callsign: Elco Eti, | I | AVCODES |
| 97 | MJM | Eti 2000 | | | ICAO1 |
| 98 | MJMA | MJM TRUCKING LLC | | | SCAC4 |
| 99 | MJMC | MCCONKEY | | | SCAC4 |
| 100 | MJMD | MJM LOGISTICS LLC | | | SCAC4 |
