| 5601 | MMX | Airmax | | | ICAO1 |
| 5602 | MMX | Monarch Molasses Co. | 1/1950-1/1952; eliminated 1/1953 | | NAKINA |
| 5603 | MMX | Mosinee Paper Mills Co. | 4/1938-1/1943; 1/1945 (not listed) | | NAKINA |
| 5604 | MMX | Mosinee Paper Mills Co. | Apr-38 | | NRHS |
| 5605 | MMX | Monarch Molasses Co. | 1/52; eliminated 1/53 | | NRHS |
| 5606 | MMX | *MOSINEE PAPER MILLS CO. | | | PWRC |
| 5607 | MMX | *MONARCH MOLASSES CO. | | | PWRC |
| 5608 | MMXB | METALES MEXICA | | | SCAC4 |
| 5609 | MMXD | MOUNTAIN MARINE TRANSPORTATION LTD | | | SCAC4 |
| 5610 | MMXG | MTM TRANSPORT LLC | | | SCAC4 |
| 5611 | MMXL | MITEX MULTIMODAL EXPRESS LTD | | | SCAC4 |
| 5612 | MMXM | MILLION MILE TRANSPORT | | | SCAC4 |
| 5613 | MMXO | M & M TRANSPORT | | | SCAC4 |
| 5614 | MMXP | MERCURY MOTOR EXPRESS INC | | | PWRC |
| 5615 | MMXQ | M & M EXPRESS INC | | | SCAC4 |
| 5616 | MMXT | M & M TRANSPORTATION LLC | | | SCAC4 |
| 5617 | MMXV | MIDMOUNTA | | | SCAC4 |
| 5618 | MMXY | MID-MO TRANSPORTATION LLC | | | SCAC4 |
| 5619 | MMXZ | MURPHY MOTOR EXPRESS, INC | | | PWRC |
| 5620 | MMXZ | Murphy Motor Express | | | RSRV |
| 5621 | MMXZ | MURPHY MOTOR EXPRESS, INC | | | SCAC4 |
| 5622 | MMY | IASCO Flight Training | Callsign: Marmot, | USA | AVCODES |
| 5623 | MMYA | MARE MARITIME COMPANY SA | | | SCAC4 |
| 5624 | MMYE | MATA MEDELLIN, YANET | | | SCAC4 |
| 5625 | MMYI | MARTIN COUNTY PETROLEUM-PROPANE DIV | | | SCAC4 |
| 5626 | MMYR | MASTER MACHINERY TRANSPORT INC | | | SCAC4 |
| 5627 | MMZ | EuroAtlantic Airways, S.A. | IATA: MM, Callsign: Euroatlantic, IATA Prefix: 551, IATA designator changed to YU. Formerly Air Zarco d/b/a Air Maderia | P | AVCODES |
| 5628 | MMZ | Air Madeira, S.A. | IATA: MM, Name changed to Air Zarco | P | AVCODES |
| 5629 | MMZ | Air Zarco t/a Air Maderia | IATA: MM, Callsign: Zarco, Formerly Air Madeira S.A. Name changed to EuroAtlantic Airways � Transportes A�reos S.A. | P | AVCODES |
| 5630 | MMZ | EuroAtlantic Airways, S.A. | IATA: YU, Callsign: Euroatlantic, IATA Prefix: 551, IATA designator changed from MM*. Name changed to EuroAtlantic Airways Transportes Aereos, S.A. Formerly Air Zarco d/b/a Air Maderia | P | AVCODES |
| 5631 | MMZ | EuroAtlantic Airways Transportes Aereos, S.A. | IATA: YU, Callsign: Euroatlantic, IATA Prefix: 551, IATA designator changed from MM*. Name changed from EuroAtlantic Airways, S.A. Formerly Air Zarco d/b/a Air Maderia | P | AVCODES |
| 5632 | MMZ | EuroAtlantic Airways | IATA: MM | | ICAO1 |
| 5633 | MMZ | MARTIN MARIETTA | | | PWRC |
| 5634 | MMZI | MARDAS MARMARA DENIZCILIK ISLETMECI | | | SCAC4 |
| 5635 | MMZT | M-MART | | | SCAC4 |
| 5636 | MN | Comair Ltd. d/b/a Kulula.com | ICAO: CAW, Callsign: Commercial, IATA Prefix: 161, Suspended operations on 31 May 2022. Name changed from Commercial Airways (Pty.) Ltd. | ZA | AVCODES |
| 5637 | MN | Commercial Airways (Pty.) Ltd. | ICAO: CAW, Callsign: Commercial, IATA Prefix: 161, Name changed to Comair Ltd. | ZA | AVCODES |
| 5638 | MN | Commercial Air Services (Pty.) Ltd. | Callsign: Commercial, IATA Prefix: 161, Name changed to Commercial Airways (Pty.) Ltd. | ZA | AVCODES |
| 5639 | MN | *MODERN TRANSFER CO INC | | | PWRC |
| 5640 | MN | *METRO-NORTH COMMUTER RAILROAD | | | PWRC |
| 5641 | MN | *MONTPELIER & BARRE RAILROAD CO. | | | PWRC |
| 5642 | MN | Midnet | | NL | TRAFFIC |
| 5643 | MNA | PT. Merpati Nusantara | IATA: MZ, Callsign: Merpati, IATA Prefix: 621, Name changed to Merpati Nusantara Airlines, Pt. | RI | AVCODES |
| 5644 | MNA | Merpati Nusantara Airlines, Pt. | IATA: MZ, Callsign: Merpati, IATA Prefix: 621, Designator MZ recalled by IATA. Name changed from PT. Merpati Nusantara | RI | AVCODES |
| 5645 | MNA | Merpati Nusantara Airlines | IATA: MZ | | ICAO1 |
| 5646 | MNA | Missouri & Northern Arkansas R.R. Co., Inc. | added 4/1993; 1/1994-7/2000; eliminated 7/2002; 7/2005 | | NAKINA |
| 5647 | MNA | Missouri & Northern Arkansas R.R. Co., Inc. | added 4/93; 1/94-7/2000 | | NRHS |
| 5648 | MNA | MISSOURI & NORTHERN ARKANSAS RAILROAD COMPANY, INC. | | | PWRC |
| 5649 | MNA | Missouri and Northern Arkansas Railroad | | | RSRV |
| 5650 | MNA | MISSOURI & NORTHERN ARKANSAS RAILRO | | | SCAC4 |
| 5651 | MNA | Missouri and Northern Arkansas Railroad | | USA | TRAFFIC |
| 5652 | MNAA | MOUNETOU, ANDRES T A A | | | SCAC4 |
| 5653 | MNAB | MN TRUCKING INC | | | SCAC4 |
| 5654 | MNAC | MAGNONE, A TRUCKING | | | SCAC4 |
| 5655 | MNAD | MODERN CABINETS INC | | | SCAC4 |
| 5656 | MNAE | MONTANA TRANSFER COMPANY | | | SCAC4 |
| 5657 | MNAG | M N A TRUCKING | | | SCAC4 |
| 5658 | MNAI | MORSE INDUSTRIES INC | | | SCAC4 |
| 5659 | MNAJ | MEENDERINCK LLC | | | SCAC4 |
| 5660 | MNAK | MATTSON, N AND SON TRUCKING LLC | | | SCAC4 |
| 5661 | MNAL | MINAL TRANSPORT | | | SCAC4 |
| 5662 | MNAN | MARTIN, A N GRAIN SYS | | | SCAC4 |
| 5663 | MNAO | MAYAN TRANSPORTATION INC | | | SCAC4 |
| 5664 | MNAR | MENALON MARINE CO LTD | | | SCAC4 |
| 5665 | MNAS | MONAS & CO LTD | | | SCAC4 |
| 5666 | MNAT | MAINSTREAM TRUCKING INC | | | SCAC4 |
| 5667 | MNAV | MARTINAIR INC | | | SCAC4 |
| 5668 | MNAW | M & N TRANSPORTATION INC | | | SCAC4 |
| 5669 | MNAX | C&S Directional Boring, Inc. | 7/2000-7/2005 (not listed) | | NAKINA |
| 5670 | MNAX | C&S Directional Boring, Inc. | Jul-00 | | NRHS |
| 5671 | MNAX | C & S DIRECTIONAL BORING INC. | | | PWRC |
| 5672 | MNAX | C and S Directional Boring | | | RSRV |
| 5673 | MNAX | C & S DIRECTIONAL BORING INC | | | SCAC4 |
| 5674 | MNAY | MCNALLY INTERNATIONAL CORP | | | SCAC4 |
| 5675 | MNB | MNG Airlines Cargo | IATA: MB, Callsign: Black Sea, IATA Prefix: 716, Name changed to MNG Airlines. Designator MB reinstated by IATA | TR | AVCODES |
| 5676 | MNB | MNG Airlines | IATA: MB, Callsign: Black Sea, IATA Prefix: 716, Name changed to MNG Airlines Cargo. Designator MB reinstated by IATA | TR | AVCODES |
| 5677 | MNB | MNG Airlines | IATA: MB | | ICAO1 |
| 5678 | MNB | MNG Airlines | | TR | TRAFFIC |
| 5679 | MNBA | MODI TRANSPORT LTD | | | SCAC4 |
| 5680 | MNBB | MILITARY TRANSPORTERS INC | | | SCAC4 |
| 5681 | MNBJ | MACNAB AUTO SALES LIMITED | | | SCAC4 |
| 5682 | MNBK | M & B TRUCKING EXPRESS CORP | | | SCAC4 |
| 5683 | MNBM | MAK TRUCKING INC | | | SCAC4 |
| 5684 | MNBN | MILLS TRUCKING INC | | | SCAC4 |
| 5685 | MNBP | M N B | | | SCAC4 |
| 5686 | MNBR | M&B R.R., L.L.C. | added 10/1997; 7/2000-7/2005 | | NAKINA |
| 5687 | MNBR | M&B R.R., L.L.C. | added 10/97; 7/2000 | | NRHS |
| 5688 | MNBR | M & B RAILROAD, LLC | | | PWRC |
| 5689 | MNBR | M and B Railroad | | | RSRV |
| 5690 | MNBR | M & B RAILROAD LLC | | | SCAC4 |
| 5691 | MNBU | MAERSK A/S | | DK | BIC |
| 5692 | MNBU | AP MOLLER | | | SCAC4 |
| 5693 | MNC | M I T Airlines Ltd. | Callsign: Muncie, | CDN | AVCODES |
| 5694 | MNC | MIT Airlines | | | ICAO1 |
| 5695 | MNC | Motive Rail Inc. d/b/a Missouri North Central R.R. | added 7/2004; 7/2005; eliminated 1/2006 | | NAKINA |
| 5696 | MNC | MOTIVE RAIL, INC. d/b/a MISSOURI NORTH CENTRAL RAILROAD | | | PWRC |
| 5697 | MNC | Missouri North Central Railroad | | | RSRV |
| 5698 | MNC | MISSOURI NORTH CENTRAL RAILROAD (MO | | | SCAC4 |
| 5699 | MNCB | MN CARRIER LTD | | | SCAC4 |
| 5700 | MNCF | MONARCH CONTAINER LINE | | | SCAC4 |
