| 1 | DSO | Dassault Falcon Service | Callsign: Dassault, ICAO designator changed from EFS | F | AVCODES |
| 2 | DSO | Dassault Falcon Service | | | ICAO1 |
| 3 | DSO | Donora Southern R.R. (Co.) | 8/1920-4/1961 | | NAKINA |
| 4 | DSO | Donora Southern R.R. Co. | 23-Jul | | NRHS |
| 5 | DSO | Donora Southern R.R. | 4/38-4/61 | | NRHS |
| 6 | DSO | DONORA SOUTHERN RR | | | PWRC |
| 7 | DSOF | DEEP SOUTH FREIGHT | | | SCAC4 |
| 8 | DSOL | DAKOTA SOUTHERN LLC | | | SCAC4 |
| 9 | DSOQ | D & S OILFIELD TRANSPORTATION INC | | | SCAC4 |
| 10 | DSOS | DELOATCH & SONS | | | SCAC4 |
| 11 | DSOU | Durham and Southern Ry. Co. | Real: DS | USA | TRAFFIC |
| 12 | DSOV | DESTINATION OVERIDE INC | | | SCAC4 |
