| 1 | RDA | T K Travel Limited | Callsign: Reward, | WAG | AVCODES |
| 2 | RDA | Redair Gambia Limited | Callsign: Redair Gambia, | WAG | AVCODES |
| 3 | RDA | Reid Airways, Inc. | Callsign: Reid-Air, | USA | AVCODES |
| 4 | RDA | Rada Airlines LLC | Callsign: Rada, | BY | AVCODES |
| 5 | RDA | Royal Danish Army | | DK | TRAFFIC |
| 6 | RDAA | R & D DISTRIBUTING LTD | | | SCAC4 |
| 7 | RDAB | RANDALL BOAT MOVING | | | SCAC3 |
| 8 | RDAB | R D T EXPRESS INC | | | SCAC4 |
| 9 | RDAD | RED ARROW DELIVERY SERVICE CO INC | | | SCAC3 |
| 10 | RDAD | RED ARROW DELIVERY SERVICE CO INC | | | SCAC4 |
| 11 | RDAF | ROADAIR FEEDER SERVICE LTD | | | SCAC3 |
| 12 | RDAF | Royal Dutch Air Force | | DK | TRAFFIC |
| 13 | RDAG | RIDEAU RECOGNITION SOLUTIONS INC | | | SCAC4 |
| 14 | RDAH | RADABAUGH TRUCKING INC | | | SCAC4 |
| 15 | RDAK | REED, DENNIS A | | | SCAC4 |
| 16 | RDAL | RANDAL TEXTRON | | | SCAC3 |
| 17 | RDAM | ROAD AMERICA | | | SCAC3 |
| 18 | RDAM | ROAD MACHINERY CO | | | SCAC4 |
| 19 | RDAO | R & D AUTO TRANSPORT | | | SCAC4 |
| 20 | RDAP | REIDPATH, DALE | | | SCAC4 |
| 21 | RDAR | RAND-AIR DIST INC | | | SCAC3 |
| 22 | RDAT | REDLANDS TRANSPORT INC | | | SCAC4 |
| 23 | RDAV | RED DRAGON TRANSPORTATION INC | | | SCAC4 |
| 24 | RDAY | RYANDAY PRODUCTS INC | | | SCAC4 |
