| MAA | MY | 865 | Mas Air |
| MAB | Millardair | ||
| MAH | MA | 182 | Malev Hungarian Airlines |
| MAI | Air Moravia | ||
| MAK | IN | 367 | Macedonian Airlines |
| MAL | Morningstar Air Express | ||
| MAS | MH | 232 | MASKargo |
| MAU | MK | 239 | Air Mauritius |
| MAW | Q4 | Mustique Airways | |
| MAY | MW | Maya Airways | |
| MBN | Q3 | 391 | Zambian Airways |
| MCC | Aerocom | ||
| MCK | CC | 374 | Macair Airlines |
| MCS | SX | Macedonian Airlines (Greece) | |
| MDA | AE | 803 | Mandarin Airlines |
| MDC | Mid Atlantic Freight | ||
| MDG | MD | 258 | Air Madagascar |
| MDJ | JT | 576 | Jaro International |
| MDL | MI | 888 | Mandala Airlines |
| MDM | Medavia | ||
| MDO | Varty Pacific Inc | ||
| MDV | 2M | 860 | Moldavian Airlines |
| MEA | ME | 076 | Middle East Airlines |
| MEC | Mercury Air | ||
| MEI | Merlin Express | ||
| MEP | YX | 453 | Midwest Airlines Cargo |
| MES | XJ | 582 | Mesaba Aviation |
| MGD | North East Cargo | ||
| MGE | 046 | Asia Pacific Airlines | |
| MGG | Magadan Air Cargo | ||
| MGL | OM | 289 | MIAT-Mongolian Airlines |
| MGM | MG | MGM Grand Air | |
| MGX | YM | 409 | Montenegro Airlines |
| MHS | 827 | Air Memphis | |
| MIF | Miras | ||
| MIN | IW | 646 | AOM-Minerve |
| MIV | MI-Avia | ||
| MIW | ZF | Airborne | |
| MJB | Magic Bird | ||
| MJL | Jet Line International | ||
| MJX | EuroLine | ||
| MKA | 7G | 513 | MK Airlines |
| MKI | Flugfelagid | ||
| MKN | M8 | Mekong Airlines | |
| MKO | B7 | Makung Airlines | |
| MKU | WP | Island Air | |
| MLA | Q5 | 519 | 40 Mile Air |
| MLD | 9U | 572 | Air Moldova |
| MLI | L9 | 109 | Air Mali S.A. |
| MLR | MJ | Mihin Lanka | |
| MLV | RM | 283 | Air Moldova International |
| MMZ | MM | Euro Atlantic Airways | |
| MNA | MZ | 621 | Merpati Nusantara |
| MNB | MB | 716 | MNG Airlines |
| MND | Madina Aviation | ||
| MNG | M0 | Aero Mongolia | |
| MNL | MiniLiner | ||
| MNX | BA | 916 | British Airways CitiExpress |
| MOD | M9 | 548 | ModiLuft |
| MON | ZB | 974 | Monarch Airlines |
| MOS | MO | 931 | MISR Overseas Airways |
| MOV | NN | Vim Airlines | |
| MPD | A7 | 352 | Air Plus Comet |
| MPH | MP | 129 | Martinair |
| MPX | QO | 976 | Aeromexpress Cargo |
| MRA | Martinaire | ||
| MRK | BF | 478 | Markair |
| MRS | CW | 778 | Air Marshall Islands |
| MRT | MR | 174 | Air Mauritanie |
| MSA | Mistral Air | ||
| MSC | M8 | 608 | Moscow Airways |
| MSI | M9 | 011 | Motor Sich JSC Airlines |
| MSK | VB | 702 | Maersk Air (UK) |
| MSR | MS | 077 | Egyptair |
| MTC | Q2 | Minerva Airlines | |
| MTE | FL | 332 | AirTran |
| MTL | RAF-Avia | ||
| MTN | Mountain Air Cargo | ||
| MTQ | NN | 606 | Air Martinique |
| MUA | 5M | National Airlines | |
| MUI | P6 | 356 | Trans Air |
| MUK | ZR | 796 | Muk Air |
| MVD | KV | Kavminvodyavia | |
| MVD | KMV - Kavminvody Avia | ||
| MVL | H5 | 428 | Magadan Airlines |
| MVR | 6M | 350 | Maverick Airways |
| MXA | MX | 132 | Mexicana |
| MXJ | MY | 386 | Maxjet Airways |
| MXP | May Air Express | ||
| MXU | 087 | Maximus Air Cargo | |
| MXX | Merchant Express Aviation | ||
| MYT | VZ | 727 | MyTravel |
| MZS | M2 | Mahfooz Aviation |