| 1 | RD | Alitalia Team | ICAO: NOV, Callsign: Alitalia Team, Merged into Alitalia w.e.f. 01 August 2002. | I | AVCODES |
| 2 | RD | Alderney Air Ferries Ltd. / Metropolitan Airlines Ltd. | | GB | AVCODES |
| 3 | RD | Avianova | ICAO: NOV, Callsign: Avianova, Merged into Alitalia Express during 1996. | I | AVCODES |
| 4 | RD | Airlift International, Inc. | ICAO: AIR, Callsign: Airlift, Designator RD recalled by IATA | USA | AVCODES |
| 5 | RD | Ryan International Airlines | ICAO: RYN, Callsign: Ryan International, Founded in 1972. Filed for Chapter 11 Bankrupcy protection on 06 March 2012. Ceased operations on 11 January 2013. IATA Designator changed from 1I | USA | AVCODES |
| 6 | RD | Small Planet Airlines Co., Ltd. | ICAO: LKH, Callsign: Skyplanet, Founded in October 2017. Ceased operations on 09 November 2018. | K | AVCODES |
| 7 | RD | Easycharter LLC | ICAO: LOL, Callsign: Easy Charter, IATA Prefix: 311, | GE | AVCODES |
| 8 | RD | LogicPaq Btd, s.r.l. d/b/a Sky Cana | ICAO: SNA, Callsign: Cana, IATA Prefix: 440, | DOM | AVCODES |
| 9 | RDA | T K Travel Limited | Callsign: Reward, | WAG | AVCODES |
| 10 | RDA | Redair Gambia Limited | Callsign: Redair Gambia, | WAG | AVCODES |
| 11 | RDA | Reid Airways, Inc. | Callsign: Reid-Air, | USA | AVCODES |
| 12 | RDA | Rada Airlines LLC | Callsign: Rada, | BY | AVCODES |
| 13 | RDA | Royal Danish Army | | DK | TRAFFIC |
| 14 | RDAA | R & D DISTRIBUTING LTD | | | SCAC4 |
| 15 | RDAB | RANDALL BOAT MOVING | | | SCAC3 |
| 16 | RDAB | R D T EXPRESS INC | | | SCAC4 |
| 17 | RDAD | RED ARROW DELIVERY SERVICE CO INC | | | SCAC3 |
| 18 | RDAD | RED ARROW DELIVERY SERVICE CO INC | | | SCAC4 |
| 19 | RDAF | ROADAIR FEEDER SERVICE LTD | | | SCAC3 |
| 20 | RDAF | Royal Dutch Air Force | | DK | TRAFFIC |
| 21 | RDAG | RIDEAU RECOGNITION SOLUTIONS INC | | | SCAC4 |
| 22 | RDAH | RADABAUGH TRUCKING INC | | | SCAC4 |
| 23 | RDAK | REED, DENNIS A | | | SCAC4 |
| 24 | RDAL | RANDAL TEXTRON | | | SCAC3 |
| 25 | RDAM | ROAD AMERICA | | | SCAC3 |
| 26 | RDAM | ROAD MACHINERY CO | | | SCAC4 |
| 27 | RDAO | R & D AUTO TRANSPORT | | | SCAC4 |
| 28 | RDAP | REIDPATH, DALE | | | SCAC4 |
| 29 | RDAR | RAND-AIR DIST INC | | | SCAC3 |
| 30 | RDAT | REDLANDS TRANSPORT INC | | | SCAC4 |
| 31 | RDAV | RED DRAGON TRANSPORTATION INC | | | SCAC4 |
| 32 | RDAY | RYANDAY PRODUCTS INC | | | SCAC4 |
| 33 | RDB | Ordabasy | Callsign: Orda, | KZ | AVCODES |
| 34 | RDBB | R D B TRUCKING | | | SCAC3 |
| 35 | RDBB | R & D SERVICES INC | | | SCAC4 |
| 36 | RDBC | READING BUS LINE INC | | | SCAC3 |
| 37 | RDBC | READING BUS LINE INC | | | SCAC4 |
| 38 | RDBD | REUNION DAY PRODUCTIONS | | | SCAC4 |
| 39 | RDBE | REPO DEPOT FIVE (5) STAR | | | SCAC4 |
| 40 | RDBF | RED BALL FORWARDERS INC | | | SCAC3 |
| 41 | RDBG | R & D TRANSPORT INC | | | SCAC4 |
| 42 | RDBH | RADABAUGH TRUCK SERVICE INC | | | SCAC3 |
| 43 | RDBH | RDB FREIGHT | | | SCAC4 |
| 44 | RDBI | RIDDELL BROTHERS INC | | | SCAC3 |
| 45 | RDBK | RED BANK TRANSPORT INC | | | SCAC3 |
| 46 | RDBK | RIDEAU BULK TERMINALS | | | SCAC4 |
| 47 | RDBL | RBL ENTERPRISES | | | SCAC3 |
| 48 | RDBM | RED BIRD OF MISSOURI | | | SCAC3 |
| 49 | RDBN | RUBBER DOGGIE BONE | | | SCAC3 |
| 50 | RDBN | RED BARON TRANSPORTATION INC | | | SCAC4 |
| 51 | RDBO | RETAIL DISTRIBUTION & LOGISTICS LLC | | | SCAC4 |
| 52 | RDBP | RED BIRD TRANSPORTATION INC | | | SCAC4 |
| 53 | RDBQ | RED BALL TRANSFER & STORAGE CO INC | | | SCAC3 |
| 54 | RDBQ | RODRIGUEZ HERRERA, GUILLERMO | | | SCAC4 |
| 55 | RDBR | RODGERS BROS SERVICES INC | | | SCAC3 |
| 56 | RDBS | RONDALE BUS SERVICE INC | | | SCAC3 |
| 57 | RDBS | RED BARON TRUCKING INC | | | SCAC4 |
| 58 | RDBT | RED BARON TRUCKING | | | SCAC3 |
| 59 | RDBU | BALESTRA | | | SCAC3 |
| 60 | RDBV | REIDS BUS SERVICE | | | SCAC3 |
| 61 | RDBW | ROBINSON, D TRUCKING LLC | | | SCAC4 |
| 62 | RDBY | ROSMAR DELIVERY SERVICE | | | SCAC4 |
| 63 | RDC | Aerolineas Del Centro, S.A. de C.V. | | MEX | AVCODES |
| 64 | RDC | RDC Autozug Sylt | | D | TRAFFIC |
| 65 | RDC | RDC Deutschland GmbH | | DE | VKM |
| 66 | RDCA | ROADRUNNER COURIER INC | | | SCAC4 |
| 67 | RDCB | RED CAB CO | | | SCAC3 |
| 68 | RDCB | RED DRAGON TRANSPORT INC | | | SCAC4 |
| 69 | RDCC | REDI-CRETE CORPORATION | | | SCAC3 |
| 70 | RDCD | RADCLIFF DELIVERY INC | | | SCAC3 |
| 71 | RDCE | PRODUCE TRANSPORT SERVICE, INC | | | SCAC3 |
| 72 | RDCF | RODRIGUEZ CRUZ, FIDEL | | | SCAC4 |
| 73 | RDCG | ROSS, DOUG CARTAGE LTD | | | SCAC3 |
| 74 | RDCG | R & D TRUCKING | | | SCAC4 |
| 75 | RDCH | RANDICH ENTERPRISES INC | | | SCAC3 |
| 76 | RDCH | RED CARPET CHARTERS | | | SCAC4 |
| 77 | RDCI | REDWOOD COAST TRUCKING | | | SCAC3 |
| 78 | RDCJ | RAY DISTRIBUTING CO OF JACKSONVILLE | | | SCAC3 |
| 79 | RDCL | RED CARPET LIMO | | | SCAC3 |
| 80 | RDCM | REGIONAL DISTRIBUTION CENTER MEMPHI | | | SCAC3 |
| 81 | RDCM | REDCOM LABORATORIES INC | | | SCAC4 |
| 82 | RDCN | REDCO TRANSPORT | | | SCAC3 |
| 83 | RDCN | ROD ACTION | | | SCAC4 |
| 84 | RDCO | ROAD, C CORP | | | SCAC3 |
| 85 | RDCP | RED CAP TRANSPORT | | | SCAC4 |
| 86 | RDCQ | R D C LOGISTICS LLC | | | SCAC4 |
| 87 | RDCR | RODS CHARTERS & TOURS | | | SCAC3 |
| 88 | RDCR | RED CARGO | | | SCAC4 |
| 89 | RDCS | RED CARPET TRAVEL SERVICE INC | | | SCAC3 |
| 90 | RDCU | LIGNES MARITIMES CONGOLAISES (L.M.C) | | RCB | BIC |
| 91 | RDCW | REED-CHATWOOD INC | | | SCAC3 |
| 92 | RDCW | RUNNING DEER CONSTRUCTION | | | SCAC4 |
| 93 | RDCX | Regional Disposal Co. | 7/2000-7/2005 (not listed) | | NAKINA |
| 94 | RDCX | Regional Disposal Co. | Jul-00 | | NRHS |
| 95 | RDCX | REGIONAL DISPOSAL COMPANY | | | PWRC |
| 96 | RDCX | Regional Disposal | | | RSRV |
| 97 | RDCY | RED ROCK TRANSFER COMPANY INC | | | SCAC4 |
| 98 | RDD | Adygeya Airlines | Callsign: Adlines, | RUS | AVCODES |
| 99 | RDD | Adygeya Airlines | | | ICAO1 |
| 100 | RDDA | REED, DAVE TRUCKING INC | | | SCAC3 |
