| 1 | MAI | Air Moravia | Callsign: Moravian, | CZ | AVCODES |
| 2 | MAI | Mauritanian Airlines International | IATA: L6, IATA Prefix: 495, Founded December 2010. Name changed to Mauritania Airlines. | RIM | AVCODES |
| 3 | MAI | Mauritania Airlines | IATA: L6, IATA Prefix: 495, Founded December 2010. Name changed from Mauritanian Airlines International. | RIM | AVCODES |
| 4 | MAI | Max Avia | | | ICAO1 |
| 5 | MAIB | MATARAZZO BROTHERS CO INC | | | SCAC4 |
| 6 | MAID | Maidstone & District | | GB | TRAFFIC |
| 7 | MAIDCT | Maidstone Corporation Transport | | GB | TRAFFIC |
| 8 | MAIE | MARINE CARGO LINES AG | | | SCAC4 |
| 9 | MAIF | MIRANDA, J TRUCKING LLC | | | SCAC4 |
| 10 | MAIG | MID-AMERICA RECYCLING COMPANY (GREE | | | SCAC4 |
| 11 | MAIJ | M A INC | | | SCAC4 |
| 12 | MAIK | MONTESA, A M TRANSPORT INC | | | SCAC4 |
| 13 | MAIL | AMERICAN MAIL LINE | | | PWRC |
| 14 | MAIL | AMERICAN PRESIDENT LINES, INC. | | | SCAC3 |
| 15 | MAIL | AMERICAN PRESIDENT LINES, INC. | | | SCAC4 |
| 16 | MAIN | MAINE SHORTLINE INC. | | | PWRC |
| 17 | MAINZ | Mainzer Verkehrsgesellschaft | Real: MVG, City: Mainz | D | TRAFFIC |
| 18 | MAIO | MAINFREIGHT | | | SCAC4 |
| 19 | MAIP | MAISLINER TRANSPORT | | | SCAC4 |
| 20 | MAIQ | M & A TRANSPORT | | | SCAC4 |
| 21 | MAIR | MILITARY AIR CARGO | | | SCAC4 |
| 22 | MAIS | MARIOS EXPRESS SERVICE INC | | | SCAC4 |
| 23 | MAIT | MIAMI AIR INTERNATIONAL INC | | | SCAC4 |
| 24 | MAIU | MARINE ATLANTIC INC | | | SCAC4 |
| 25 | MAIX | Mason Iron and Paper Stock Inc. | 7/2005 (not listed) | | NAKINA |
| 26 | MAIX | MACON IRON & PAPER STOCK, INC. | | | PWRC |
| 27 | MAIX | Macon Iron and Paper Stock | | | RSRV |
| 28 | MAIX | MACON IRON & PAPER STOCK CO | | | SCAC4 |
| 29 | MAIY | MAINSTREET EXPRESS | | | SCAC4 |
