| 1 | DRM | Aviation South West Limited | Callsign: Dartmoor, | GB | AVCODES |
| 2 | DRM | Airways Flight Training | | | ICAO1 |
| 3 | DRMA | DREAME | | | SCAC4 |
| 4 | DRMD | DURHAM, DUANE | | | SCAC4 |
| 5 | DRMN | DOGUETS RICE MILLING COMPANY | | | SCAC4 |
| 6 | DRMQ | DRATON REDI-MIX LTD | | | SCAC4 |
| 7 | DRMS | DEL RIO MOVING & STORAGE | | | SCAC4 |
| 8 | DRMV | DOORMAN SERVICE CO INC, THE | | | SCAC4 |
| 9 | DRMX | Danbury Railway Museum Inc. | 7/2000-7/2005 (not listed) | | NAKINA |
| 10 | DRMX | Danbury Railway Museum Inc. | Jul-00 | | NRHS |
| 11 | DRMX | DANBURY RAILWAY MUSEUM, INC. | | | PWRC |
| 12 | DRMX | DANBURY RAILWAY MUSEUM INC. | | | PWRC |
| 13 | DRMX | Danbury Railway Museum | | | RSRV |
| 14 | DRMX | DANBURY RAILWAY MUSEUM INC | | | SCAC4 |
| 15 | DRMY | DRM TRUCKING LLC | | | SCAC4 |
| 16 | DRMZ | DRUMMOND | | | PWRC |