| 1 | DRI | Air Madrid Lineas Aereas, S.A. | IATA: NM, Callsign: Alada Air, IATA Prefix: 476, ICAO designator changed to DRD | E | AVCODES |
| 2 | DRI | Davenport, Rock Island & North Western Ry. Co. | 8/1920-1/1994; eliminated 7/1996; 7/2000-7/2005 | | NAKINA |
| 3 | DRI | Davenport, Rock Island & North Western Ry. Co. | 7/23-1/94; eliminated 7/96; 7/2000 | | NRHS |
| 4 | DRI | DAVENPORT, ROCK ISLAND & NORTH WESTERN RWY | | | PWRC |
| 5 | DRI | Davenport, Rock Island and North Western Railway | | | RSRV |
| 6 | DRI | Davenport, Rock Island & North Western Ry. Co. | | USA | TRAFFIC |
| 7 | DRIC | DRISCO LLC | | | SCAC4 |
| 8 | DRID | DRILFORMANCE | | | SCAC4 |
| 9 | DRIE | DROUIN, N TRANSPORT INC | | | SCAC4 |
| 10 | DRIF | DRIFTY TRUCKING CO INC | | | SCAC4 |
| 11 | DRIG | DIGGING AND RIGGING INC | | | SCAC4 |
| 12 | DRIJ | DRIVE STAR INC | | | SCAC4 |
| 13 | DRIK | DELMAR COMMODITIES LTD | | | SCAC4 |
| 14 | DRIM | DART INTERMODAL INC | | | SCAC4 |
| 15 | DRIN | DA RAN INC | | | SCAC4 |
| 16 | DRIQ | DERRICO TRUCKING LLC | | | SCAC4 |
| 17 | DRIR | Denver Rock Island R.R. | added 4/1997; 7/2000; eliminated 10/2001; 7/2005 | | NAKINA |
| 18 | DRIR | Denver Rock Island R.R. | added 4/97; 7/2000 | | NRHS |
| 19 | DRIR | DENVER ROCK ISLAND RAILROAD | | | PWRC |
| 20 | DRIR | Denver Rock Island Railroad | | | RSRV |
| 21 | DRIR | DENVER ROCK ISLAND RAILROAD | | | SCAC4 |
| 22 | DRIV | DRIVER TRUCKING INC | | | SCAC4 |
| 23 | DRIZ | DRACKETT, INC. | | | PWRC |
