| 1 | MAY | Maya Airways Ltd. | Callsign: Maya, | BH | AVCODES |
| 2 | MAY | Majestic Executive Aviation AG | | A | AVCODES |
| 3 | MAY | MAAT Ltd t/a Malta Air | IATA: AL, Callsign: Blue Med, Name changed to Malta Air Limited. Ryanair Holdings Group | M | AVCODES |
| 4 | MAY | Malta Air Limited | IATA: AL, Callsign: Blue Med, Name changed from MAAT Ltd t/a Malta Air. Ryanair Holdings Group | M | AVCODES |
| 5 | MAY | Malta Air Limited | Callsign: Blue Med, Designator AL recalled by IATA. Name changed from MAAT Ltd t/a Malta Air. Ryanair Holdings Group | M | AVCODES |
| 6 | MAYA | MAY TRUCKING COMPANY | | | SCAC4 |
| 7 | MAYB | MAYBEE, JOEL INC | | | SCAC4 |
| 8 | MAYC | MOYERS CHICKS INC | | | SCAC4 |
| 9 | MAYD | MAY TRUCKING COMPANY (DEDICATED SER | | | SCAC4 |
| 10 | MAYE | MAYE TRANSPORT INC | | | SCAC4 |
| 11 | MAYF | MAYS TRANSPORTS | | | SCAC4 |
| 12 | MAYG | MAY TRUCKING COMPANY (GEORGIA PACIF | | | SCAC4 |
| 13 | MAYI | MAYSHIP AGENCY LLC | | | SCAC4 |
| 14 | MAYJ | MAYA TRANSPORTATION COMPANY INC | | | SCAC4 |
| 15 | MAYK | MAYFAIR TRUCKING INC | | | SCAC4 |
| 16 | MAYL | MURPHY, RAYMOND TRUCKING LTD | | | SCAC4 |
| 17 | MAYM | MAYPA TRUCKING INC | | | SCAC4 |
| 18 | MAYN | MAYBERRY | | | SCAC4 |
| 19 | MAYO | MAYORQUIN, RAMON | | | SCAC4 |
| 20 | MAYS | MAYES FAMILY FARMS | | | SCAC4 |
| 21 | MAYT | MAY TRUCKING COMPANY | | | SCAC1 |
| 22 | MAYT | MAY TRUCKING CO | | | SCAC4 |
| 23 | MAYW | Maywood & Sugar Creek | 1/1980-7/2005 | | NAKINA |
| 24 | MAYW | Maywood & Sugar Creek | 1/80-7/2000 | | NRHS |
| 25 | MAYW | MAYWOOD & SUGAR CREEK | | | PWRC |
| 26 | MAYW | Maywood and Sugar Creek | | | RSRV |
| 27 | MAYW | MAYNARD | | | SCAC4 |
