| 1 | MWA | Midwest Airlines | IATA: MY, Designator MY* recalled by IATA | ET | AVCODES |
| 2 | MWA | Midwest Airlines (Egypt) | IATA: MY | | ICAO1 |
| 3 | MWAB | MORRIS, WILLIAM & ASSOCIATES INC | | | SCAC4 |
| 4 | MWAB | Midwaggon AB | 1998 - | S | svenska-lok.se |
| 5 | MWAB | Midwaggon AB | 1998 - | S | TRAFFIC |
| 6 | MWAB | Midwaggon AB | | SE | VKM |
| 7 | MWAC | MIDWEST STEEL INC | | | SCAC4 |
| 8 | MWAG | MIDWAY MOVING & STORAGE INC | | | SCAC4 |
| 9 | MWAH | MCGILL, WAYNE | | | SCAC4 |
| 10 | MWAJ | M W A TRANSPORT | | | SCAC4 |
| 11 | MWAL | MARWALL TRANSPORT | | | SCAC4 |
| 12 | MWAO | MIDWEST AIR TECHNOLOGIES INC | | | SCAC4 |
| 13 | MWAP | MULLINS WAY | | | SCAC4 |
| 14 | MWAR | Miejskie Zakłady Autobusowe w Warszawie | | PL | TRAFFIC |
| 15 | MWAU | MEDWAY ASSETS - GESTÃO DE ATIVOS S.A. | | P | BIC |
| 16 | MWAX | Martin Marietta Materials, Inc. | added 7/1997; 7/2000-7/2005 (not listed) | | NAKINA |
| 17 | MWAX | Martin Marietta Materials, Inc. | added 7/97; 7/2000 | | NRHS |
| 18 | MWAX | MARTIN MARIETTA MATERIALS INC. [MID-WESTERN AGGREGATES, LLC.] | | | PWRC |
| 19 | MWAX | Martin Marietta Materials | | | RSRV |
| 20 | MWAX | MARTIN MARIETTA MATERIALS INC | | | SCAC4 |
