| 1 | RDO | Air Dominicana S.A. | IATA: 6D, Callsign: Air Dom, | DOM | AVCODES |
| 2 | RDO | Air Dominicana S.A. | IATA: ED, Callsign: Air Dom, Founded in 2008. Ceased operations during 2009. | DOM | AVCODES |
| 3 | RDOB | RICE, DONALD B TIRE CO INC | | | SCAC4 |
| 4 | RDOC | RADIO CAB COMPANY | | | SCAC3 |
| 5 | RDOD | RAY, DON DRIVE-A-WAY COMPANY OF IND | | | SCAC3 |
| 6 | RDOE | RENDO EXPRESS INC | | | SCAC3 |
| 7 | RDOI | ROADCO INC | | | SCAC3 |
| 8 | RDOI | RED DOOR OIL | | | SCAC4 |
| 9 | RDOL | RIDOL INC | | | SCAC3 |
| 10 | RDON | RIDE-ON-TRANSPORT | | | SCAC3 |
| 11 | RDOR | R & D TRANSPORT INC | | | SCAC4 |
| 12 | RDOS | RIDEOUTS SERVICE | | | SCAC3 |
| 13 | RDOT | RHODE ISLAND DEPT. OF TRANSPORTATION | | | PWRC |
| 14 | RDOT | ROUND, DON TRUCKING LLC | | | SCAC4 |
| 15 | RDOV | ROSE, DON OIL CO INC | | | SCAC4 |
