| 1 | MM | Sociedad Aeronautica de Medellin Consolidada S.A. (SAM) | ICAO: SAM, Callsign: Sam, IATA Prefix: 334, Ceased operations in October 2010. Designator MM reinstated by IATA | CO | AVCODES |
| 2 | MM | EuroAtlantic Airways, S.A. | ICAO: MMZ, Callsign: Euroatlantic, IATA Prefix: 551, IATA designator changed to YU. Formerly Air Zarco d/b/a Air Maderia | P | AVCODES |
| 3 | MM | Air Madeira, S.A. | ICAO: MMZ, Name changed to Air Zarco | P | AVCODES |
| 4 | MM | Air Zarco t/a Air Maderia | ICAO: MMZ, Callsign: Zarco, Formerly Air Madeira S.A. Name changed to EuroAtlantic Airways � Transportes A�reos S.A. | P | AVCODES |
| 5 | MM | Peach Aviation Limited | ICAO: APJ, Callsign: Air Peach, | J | AVCODES |
| 6 | MM | Malta Air Travel Ltd d/b/a Malta MedAir | ICAO: MMO, Callsign: Malit, IATA designator changed to MT. | M | AVCODES |
| 7 | MM | Manasik Aviation Company | ICAO: MNM, Callsign: Manasik, IATA Desigantor changed to XN*. | SA | AVCODES |
| 8 | MMA | Metro Manila Airways International, Inc. | | RP | AVCODES |
| 9 | MMA | Myanmar Airways International Company Ltd. | IATA: 8M, Callsign: Myanmar, IATA Prefix: 599, | MYA | AVCODES |
| 10 | MMA | Mondair | Callsign: Mondair, | MA | AVCODES |
| 11 | MMA | Montreal, Maine and Atlantic Ry. Ltd. | added 4/2003; 7/2005 | | NAKINA |
| 12 | MMA | MONTREAL, MAINE & ATLANTIC RAILWAY | | | PWRC |
| 13 | MMA | Montreal, Maine and Atlantic Railway | | | RSRV |
| 14 | MMA | MONTREAL MAINE AND ATLANTIC RAILWAY | | | SCAC4 |
| 15 | MMA | Montreal, Maine & Atlantic Railway Company | | CDN | TRAFFIC |
| 16 | MMAC | MONTREAL, MAINE & ATLANTIC RAILWAY | | | PWRC |
| 17 | MMAC | Montreal, Maine and Atlantic Railway | | | RSRV |
| 18 | MMAE | M & M TRANSPORTATION | | | SCAC4 |
| 19 | MMAF | MSR MOBILE STAGE RENTALS LLC | | | SCAC4 |
| 20 | MMAG | MCAULIFFE MARITIME AGENCY INC | | | SCAC4 |
| 21 | MMAI | MJ PETROLEUM | | | SCAC4 |
| 22 | MMAJ | MOSMATIC CORPORATION | | | SCAC4 |
| 23 | MMAM | MILLENIUM MARINE | | | SCAC4 |
| 24 | MMAP | M & M TRANSPORT INC | | | SCAC4 |
| 25 | MMAU | MAERSK A/S | | DK | BIC |
| 26 | MMAU | AP MOLLER | | | SCAC4 |
| 27 | MMAV | MORALES MOVING & STORAGE CO INC | | | SCAC4 |
| 28 | MMAW | MOOMAW | | | SCAC4 |
| 29 | MMAX | Martin Marietta Materials, Inc. | added 7/2007 | | NAKINA |
| 30 | MMAX | Martin Marietta Corp. | added 4/1985; 1/1994; eliminated 7/1997; 7/2000-7/2005 (not listed) | | NAKINA |
| 31 | MMAX | Martin Marietta Aluminum Inc. | added 7/1982; eliminated 1/1985 | | NAKINA |
| 32 | MMAX | Defense Plant Corp. | 1/1945-1/1946 | | NAKINA |
| 33 | MMAX | Martin Marietta Aluminum Inc. | added 7/82; eliminated 1/85 | | NRHS |
| 34 | MMAX | Martin Marietta Corp. | added 4/85; 1/94; eliminated 7/97; 7/2000 | | NRHS |
| 35 | MMAX | *DEFENSE PLANT CORP. | | | PWRC |
| 36 | MMAX | +MARTIN MARIETTA MATERIALS, INC. [MARTIN MARIETTA ALUMINUM, INC.] | | | PWRC |
| 37 | MMAX | Martin Marietta Aluminum | | | RSRV |
| 38 | MMAX | MARTIN MARIETTA MATERIALS INC | | | SCAC4 |
| 39 | MMAZ | MARTIN MARIETTA AGREGATES, INC. | | | PWRC |
| 40 | MMBA | MI MAMAS TORTILLAS | | | SCAC4 |
| 41 | MMBC | M & M TRUCKING | | | SCAC4 |
| 42 | MMBE | MARK, MARTIN TRUCKING | | | SCAC4 |
| 43 | MMBJ | MOTORGRAPHIC | | | SCAC4 |
| 44 | MMBK | MMC TRANSPORT INC | | | SCAC4 |
| 45 | MMBL | MANUFACTURE DE MEUBLES VALENTINO IN | | | SCAC4 |
| 46 | MMBL | Montebello Municipal Bus Lines | | US-CA | TRAFFIC |
| 47 | MMBM | M & M TRUCKING | | | SCAC4 |
| 48 | MMBP | MORSE MOVING AND STORAGE INDIANAPOL | | | SCAC4 |
| 49 | MMBQ | MINTON MOTOR TRANSPORT INC | | | SCAC4 |
| 50 | MMBX | Master Builders, Inc. | added 10/1987; 1/1994; eliminated 10/1995; added 10/1996; eliminated 1/1997; 7/2000-7/2005 (not listed) | | NAKINA |
| 51 | MMBX | Martin Marietta Corp. | added 1/1979; 1/1980; eliminated 7/1986 | | NAKINA |
| 52 | MMBX | Martin Marietta Corp. | added 1/79; 1/80; eliminated 7/86 | | NRHS |
| 53 | MMBX | Master Builders, Inc. | added 10/87; 1/94; eliminated 10/95; added 10/96; eliminated 1/97; 7/2000 | | NRHS |
| 54 | MMBX | MARTIN MARIETTA CORPORATION [MASTER BUILDERS, INC.] | | | PWRC |
| 55 | MMBX | Martin Marietta Corporation (Master Builders) | | | RSRV |
| 56 | MMBX | MASTER BUILDERS, INC. | | | SCAC4 |
| 57 | MMC | Aermarche | Callsign: Aermarche, | I | AVCODES |
| 58 | MMC | Aermarche | | | ICAO1 |
| 59 | MMCA | M&M CARTAGE, INC | | | SCAC1 |
| 60 | MMCA | M & M CARTAGE INC | | | SCAC4 |
| 61 | MMCB | M & M WESTCOAST PRODUCE INC | | | SCAC4 |
| 62 | MMCE | MAMM | | | SCAC4 |
| 63 | MMCG | M & M CARTAGE COMPANY INC | | | SCAC4 |
| 64 | MMCH | MILITARY MOVERS LLC | | | SCAC4 |
| 65 | MMCI | MISENER MARINE CONSTRUCTION INCORPO | | | SCAC4 |
| 66 | MMCK | M & M TRUCKING LLC | | | SCAC4 |
| 67 | MMCS | MCL MCGILL CARRIERS LTD | | | SCAC4 |
| 68 | MMCT | MERCER MORTON COOP TRANSPORT ASSN | | | SCAC4 |
| 69 | MMCU | CMA-CGM | | F | BIC |
| 70 | MMCU | CIE DES MESSAGERIES MARITIMES | | | PWRC |
| 71 | MMCU | CIE Des Messageries Maritimes | | | RSRV |
| 72 | MMCU | CMA-CGM | | | SCAC4 |
| 73 | MMCV | MOUNTAINM | | | SCAC4 |
| 74 | MMCW | MAMM | | | SCAC4 |
| 75 | MMCX | Pan American Railway Co. | added 4/2002; 7/2005 | | NAKINA |
| 76 | MMCX | TransMatrix, Inc. | added 7/1989; 1/1994-7/2000; eliminated 4/2002 | | NAKINA |
| 77 | MMCX | M & M Chemical Products, Inc. | added 7/1977; 1/1980; eliminated 7/1989 | | NAKINA |
| 78 | MMCX | North American Car Corp. | added 1/1961; 4/1961-4/1970; eliminated 1/1972 | | NAKINA |
| 79 | MMCX | McClintle-Marshall Construction Co. | 7/1923 | | NAKINA |
| 80 | MMCX | M & M Chemical Products, Inc. | added 7/77; 1/80; eliminated 7/89 | | NRHS |
| 81 | MMCX | North American Car Corp. | 4/61-4/70; eliminated 1/72 | | NRHS |
| 82 | MMCX | TransMatrix, Inc. | added 7/89; 1/94-7/2000 | | NRHS |
| 83 | MMCX | *MCCLINTLE-MARSHALL CONSTRUCTION CO. | | | PWRC |
| 84 | MMCX | *NORTH AMERICAN CAR CORP. | | | PWRC |
| 85 | MMCX | +PAN AMERICAN RAILWAY CO. [(TMIX) TRANSMATRIX, INC.; M & M CHEMICAL PRODUCTS INC.] | | | PWRC |
| 86 | MMCX | M&M Chemical Products (TransMatrix) | | | RSRV |
| 87 | MMCX | PAN AMERICAN RAILWAY COMPANY | | | SCAC4 |
| 88 | MMCX | TransMatrix, Inc. | | USA | TRAFFIC |
| 89 | MMCY | M & M DELIVERY INC | | | SCAC4 |
| 90 | MMCZ | M & M CORPORATION | | | PWRC |
| 91 | MMD | Air Alsie A/S | Callsign: Mermaid, ICAO designator changed from ALS | DK | AVCODES |
| 92 | MMD | Alsie Express | IATA: 6I, Callsign: Mermaid, Operated by Air Alsie | DK | AVCODES |
| 93 | MMD | Air Alsie | | | ICAO1 |
| 94 | MMDA | M M & M TRANSPORTATION LLC | | | SCAC4 |
| 95 | MMDB | MID MOVING & STORAGE INC | | | SCAC4 |
| 96 | MMDC | M & M DELIVERIES INC | | | SCAC4 |
| 97 | MMDD | MERCHANTS MOVING & STORAGE INC | | | SCAC4 |
| 98 | MMDE | MULTI FREIGHT EXPRESS INC | | | SCAC4 |
| 99 | MMDF | MONTRIG FREIGHT | | | SCAC4 |
| 100 | MMDG | MMD LOGISTICS INC | | | SCAC4 |
