| 1 | MRH | Marham FTU | Callsign: Marham, | GB | AVCODES |
| 2 | MRH | Marham Flying Training Unit | | | ICAO1 |
| 3 | MRH | MIDWEST RAILWAY HISTORICAL FOUNDATION | | | PWRC |
| 4 | MRHB | MARSH RACING | | | SCAC4 |
| 5 | MRHC | MARATHON COACH INC | | | SCAC4 |
| 6 | MRHF | MIDWEST RAILWAY HISTORICAL FOUNDATION | | | PWRC |
| 7 | MRHI | MARSHIP S R L | | | SCAC4 |
| 8 | MRHK | MARSHA | | | SCAC4 |
| 9 | MRHL | MARCUS, HAROLD LIMITED | | | SCAC4 |
| 10 | MRHP | MARCH TRANSPORT INC | | | SCAC4 |
| 11 | MRHQ | MCRITCHIE TRUCKING | | | SCAC4 |
| 12 | MRHR | MRSH TRANSPORT LLC | | | SCAC4 |
| 13 | MRHS | MIDLAND RAILWAY | | | PWRC |
| 14 | MRHS | Midland Railway | | | RSRV |
| 15 | MRHU | MERIH ULUSLARARASI NAKLIYAT TIC. LTD.STI | | TR | BIC |
