| Macair Airlines | CC | MCK | 374 |
| Macedonian Airlines | IN | MAK | 367 |
| Macedonian Airlines (Greece) | SX | MCS | |
| Madina Aviation | MND | ||
| Maersk Air (UK) | VB | MSK | 702 |
| Maersk Air Cargo | DM | DAN | 349 |
| Magadan Air Cargo | MGG | ||
| Magadan Airlines | H5 | MVL | 428 |
| Magic Bird | MJB | ||
| Mahan Air | W5 | IRM | 537 |
| Mahfooz Aviation | M2 | MZS | |
| Makung Airlines | B7 | MKO | |
| Malev Hungarian Airlines | MA | MAH | 182 |
| Malmö Aviation | TF | SCW | 276 |
| Mandala Airlines | MI | MDL | 888 |
| Mandarin Airlines | AE | MDA | 803 |
| Markair | BF | MRK | 478 |
| Martinair | MP | MPH | 129 |
| Martinaire | MRA | ||
| Mas Air | MY | MAA | 865 |
| MASKargo | MH | MAS | 232 |
| Maverick Airways | 6M | MVR | 350 |
| Maximus Air Cargo | MXU | 087 | |
| Maxjet Airways | MY | MXJ | 386 |
| May Air Express | MXP | ||
| Maya Airways | MW | MAY | |
| Maya Island Air | IML | ||
| Medavia | MDM | ||
| Mediterranean Air Services | MG | ||
| Mekong Airlines | M8 | MKN | |
| Memrykord UK | JPN | ||
| Merchant Express Aviation | MXX | ||
| Mercury Air | MEC | ||
| Meridiana | IG | ISS | 191 |
| Merlin Express | MEI | ||
| Merpati Nusantara | MZ | MNA | 621 |
| Mesa Airlines Inc | YV | ASH | 533 |
| Mesaba Aviation | XJ | MES | 582 |
| Mexicana | MX | MXA | 132 |
| MGM Grand Air | MG | MGM | |
| MI-Avia | MIV | ||
| Miami Air International | GL | BSK | |
| MIAT-Mongolian Airlines | OM | MGL | 289 |
| Mid Atlantic Freight | MDC | ||
| Mid-Africa Airlines | |||
| Middle East Airlines | ME | MEA | 076 |
| Midwest Airlines Cargo | YX | MEP | 453 |
| Midwest Connect | AL | SYX | |
| Mihin Lanka | MJ | MLR | |
| Millardair | MAB | ||
| Millon Airlines | OXO | ||
| Minerva Airlines | Q2 | MTC | |
| MiniLiner | MNL | ||
| Miras | MIF | ||
| Mirni Air Enterprise | DRU | ||
| MISR Overseas Airways | MO | MOS | 931 |
| Mistral Air | MSA | ||
| MK Airlines | 7G | MKA | 513 |
| MNG Airlines | MB | MNB | 716 |
| ModiLuft | M9 | MOD | 548 |
| Moldavian Airlines | 2M | MDV | 860 |
| Monarch Airlines | ZB | MON | 974 |
| Montavia | |||
| Montenegro Airlines | YM | MGX | 409 |
| Morningstar Air Express | MAL | ||
| Moscow Airways | M8 | MSC | 608 |
| Mostransgaz Airline | |||
| Motor Sich JSC Airlines | M9 | MSI | 011 |
| Mount Cook | NM | NZM | 445 |
| Mountain Air Cargo | MTN | ||
| Muk Air | ZR | MUK | 796 |
| Mustique Airways | Q4 | MAW | |
| Myachkovo Air Service | |||
| Myanmar Airways International | 8M | UBA | 599 |
| MyTravel | VZ | MYT | 727 |
| MyTravel Airways | DK | VKG | 630 |