| 1 | MDW | Midway Airlines | IATA: JI, Callsign: Midway, IATA Prefix: 878, Suspended operations on 17 July 2002. | USA | AVCODES |
| 2 | MDW | Flyawesome Limited | Callsign: Medwing, Name changed from Flyawesome Holdings Limited. ICAO designator changed from FMB. ICAO Callsign changed from Rescue JEt. | M | AVCODES |
| 3 | MDW | Midway Airlines | IATA: JI | | ICAO1 |
| 4 | MDW | Minnesota, Dakota & Western Ry. Co. | 1/1975-7/2005 | | NAKINA |
| 5 | MDW | Minnesota, Dakota & Western Ry. Co. | 1/75-7/2000 | | NRHS |
| 6 | MDW | MINNESOTA, DAKOTA & WESTERN RAILWAY CO. | | | PWRC |
| 7 | MDW | Minnesota, Dakota and Western Railway | | | RSRV |
| 8 | MDW | MINNESOTA DAKOTA & WESTERN RAILWAY | | | SCAC4 |
| 9 | MDW | Minnesota, Dakota & Western | | USA | TRAFFIC |
| 10 | MDWC | MIDWEST CARRIERS INC | | | SCAC4 |
| 11 | MDWE | MID-WEST MATERIAL WAREHOUSING SERVI | | | SCAC4 |
| 12 | MDWF | MIDWEST FARMERS COOPERATIVE | | | SCAC4 |
| 13 | MDWI | MIDWEST TRANSPORT SPECIALISTS INC | | | SCAC4 |
| 14 | MDWK | MCANDREW TRANSPORTATION | | | SCAC4 |
| 15 | MDWL | MIDWEST EXPRESS LOGISTICS LLC | | | SCAC4 |
| 16 | MDWM | MDW EXPRESS TRANSPORT LTD | | | SCAC4 |
| 17 | MDWN | MIDWESTERN TRANSIT SERVICE INC | | | SCAC4 |
| 18 | MDWO | MIDWEST COURIER INC | | | SCAC4 |
| 19 | MDWQ | MD THERMOWINDOWS LTD | | | SCAC4 |
| 20 | MDWT | MIDWEST TRANSPORTATION RESOURCES LL | | | SCAC4 |
| 21 | MDWU | MINNESOTA, DAKOTA AND WESTERN RAILWAY CO. | | | PWRC |
| 22 | MDWU | Minnesota, Dakota and Western Railway | | | RSRV |
| 23 | MDWV | MIDWEST RAIL AND DISMANTLING INC | | | SCAC4 |
| 24 | MDWW | MCCUNE DESIGN WOODWORKS | | | SCAC4 |
| 25 | MDWY | MIDWAY MOTOR FREIGHT LINES, INC | | | SCAC1 |
| 26 | MDWY | MEADWA | | | SCAC4 |
| 27 | MDWZ | MINNESOTA, DAKOTA AND WESTERN RAILWAY CO. | | | PWRC |
| 28 | MDWZ | Minnesota, Dakota and Western Railway | | | RSRV |
| 29 | MDWZ | MINNESOTA DAKOTA & WESTERN RAILWAY | | | SCAC4 |
