| 1 | MJR | Midamerica Jet, Inc. | Callsign: Major, | USA | AVCODES |
| 2 | MJR | Midamerica Jet | | | ICAO1 |
| 3 | MJRB | MCKINNON, JAMES R TRUCKING LLC | | | SCAC4 |
| 4 | MJRC | MOORE, JOHN R TRUCKING INC | | | SCAC4 |
| 5 | MJRE | MJR ENTERPRISES LLC | | | SCAC4 |
| 6 | MJRK | MARTINEZ, J R TRUCKING | | | SCAC4 |
| 7 | MJRM | MJR MESSENGER INC | | | SCAC4 |
| 8 | MJRO | MARTIN, J R TRANSPORT LLC | | | SCAC4 |
| 9 | MJRQ | M J R HORSE TRANSPORTATION INC | | | SCAC4 |
| 10 | MJRT | MAJOR TRANSPORTATION SERVICES INC | | | SCAC4 |
| 11 | MJRX | Railway Service Contractors | added 10/2003; eliminated 1/2004; 7/2005 (not listed) | | NAKINA |
| 12 | MJRX | RAILWAY SERVICE CONTRACTORS INC. | | | PWRC |
| 13 | MJRX | M. Ryan Railway Service Contractors | | | RSRV |
| 14 | MJRX | RAILWAY SERVICE CONTRACTORS INC | | | SCAC4 |
