| 4001 | RH | Republic Express Airlines, Pt. | ICAO: RPH, Callsign: Public Express, IATA designator changed from RV | RI | AVCODES |
| 4002 | RH | Air Rhodesia | Callsign: Rhodesia, Name changed to Air Zimbabwe | RNY | AVCODES |
| 4003 | RH | Air Zimbabwe | IATA desigantor changed to UM. Name changed from Air Rhodesia | ZW | AVCODES |
| 4004 | RH | Arca Aerovias Colombianas Ltda. | ICAO: AKC, Callsign: Arca, Designator RH recalled by IATA | CO | AVCODES |
| 4005 | RH | Robin Hood Aviation GmbH | ICAO: RHA, Callsign: Sherwood, Founded in 2007. Ceased operations on 23 August 2011. Designator RH* reinstated by IATA | A | AVCODES |
| 4006 | RH | Hong Kong Air Cargo Co., Ltd. | ICAO: HKC, Callsign: Mascot, IATA Prefix: 828, | PRC | AVCODES |
| 4007 | RH | R&H Rail | | AUS | TRAFFIC |
| 4008 | RHA | Robin Hood Aviation GmbH | IATA: RH, Callsign: Sherwood, Founded in 2007. Ceased operations on 23 August 2011. Designator RH* reinstated by IATA | A | AVCODES |
| 4009 | RHAD | RHOADES TRANSFER & STORAGE CO | | | SCAC3 |
| 4010 | RHAG | REINACHER HAULING | | | SCAC4 |
| 4011 | RHAS | RHINES, P & SONS TRUCKING | | | SCAC3 |
| 4012 | RHAT | REHA TRUCKING | | | SCAC3 |
| 4013 | RHAU | LLC RAILGO | | RUS | BIC |
| 4014 | RHAV | RHOADES AVIATION INC | | | SCAC4 |
| 4015 | RHAX | Sulphur Sales, Inc. | added 10/1974; 1/1975-1/1980; eliminated 1/1986 | | NAKINA |
| 4016 | RHAX | Sulphur Sales, Inc. | added 10/74; 1/75-1/80; eliminated 1/86 | | NRHS |
| 4017 | RHAX | SULPHUR SALES INC | | | PWRC |
| 4018 | RHAX | Sulphur Sales | | | RSRV |
| 4019 | RHAX | SULPHUR SALES INC | | | SCAC4 |
| 4020 | RHB | Rhein Helikopter AG | Callsign: Rhein Heli, Merged into Swiss Helicopter AG. | CH | AVCODES |
| 4021 | RHB | Rhein-Haardtbahn GmbH | Bad Dürkheim | D | privat-bahn.de |
| 4022 | RHB | Rhätische Bahn | | CH | TRAFFIC |
| 4023 | RHB | Rhätische Bahn (RhB) | | CH | VKM |
| 4024 | RHBA | Rhein-Haardt-Bahn | | D | TRAFFIC |
| 4025 | RHBD | RED HOT BONDED DELIVERY | | | SCAC3 |
| 4026 | RHBD | RHENANIA TRANSPORT BV | | | SCAC4 |
| 4027 | RHBG | Rheingold-Zug Betriebsgesellschaft mbH | | DE | VKM |
| 4028 | RHBH | ROHRBACH TRUCKING | | | SCAC3 |
| 4029 | RHBH | ROHIT TRANSPORT LTD | | | SCAC4 |
| 4030 | RHBN | REHBEIN BUS SERVICE INC | | | SCAC3 |
| 4031 | RHBRN | Rheinbraun - Rheinische Braunkohlenwerke | | D | TRAFFIC |
| 4032 | RHBT | R H B TRUCKING INC | | | SCAC4 |
| 4033 | RHBX | R.H. Bogle Co. | 4/1947-1/1980; eliminated 5/1983 | | NAKINA |
| 4034 | RHBX | R.H. Bogle Co. | 1/52-1/80; eliminated 5/83 | | NRHS |
| 4035 | RHBX | R.H. BOGLE CO. | | | PWRC |
| 4036 | RHBX | R. H. Bogle | | | RSRV |
| 4037 | RHC | Redhill Aviation Ltd. | IATA: 8L, Callsign: Redair, Designator 8L* recalled by IATA | GB | AVCODES |
| 4038 | RHC | Redhill Aviation Ltd. | Callsign: Redair, Designator 8L* recalled by IATA | GB | AVCODES |
| 4039 | RHC | Redhill Aviation | IATA: 8L | | ICAO1 |
| 4040 | RHC | RheinCargo GmbH & Co. KG | | DE | VKM |
| 4041 | RHCA | RheinCargo | Real: RHC | D | TRAFFIC |
| 4042 | RHCB | RONA HOME CENTRE AND THE KITCHEN & | | | SCAC4 |
| 4043 | RHCD | RICHARDS | | | SCAC4 |
| 4044 | RHCE | RHODES, C E ENTERPRISES | | | SCAC3 |
| 4045 | RHCF | RICHCLIFF TRUCKING INC | | | SCAC3 |
| 4046 | RHCG | RICHMOND CARTAGE CO INC | | | SCAC3 |
| 4047 | RHCH | ROSENEATH CHINCHILLA | | | SCAC4 |
| 4048 | RHCI | RANDYS HIGH COUNTRY TOWING INC | | | SCAC4 |
| 4049 | RHCL | RICHMORE CO. LTD | | | SCAC3 |
| 4050 | RHCN | RIGHTWAY HAULING CORPORATION | | | SCAC4 |
| 4051 | RHCO | RAWHIDE CHEMOIL INC | | | SCAC4 |
| 4052 | RHCP | ROADS & HIGHWAYS CORP | | | SCAC4 |
| 4053 | RHCV | ROCKINGHAM CARRIAGE SERVICE INC | | | SCAC4 |
| 4054 | RHCX | The Roessler & Hasslacher Chemical Co., Inc. | 7/1932 | | NAKINA |
| 4055 | RHCX | The Roessler & Hasslacher Chemical Co. | 7/1930 | | NAKINA |
| 4056 | RHCX | ROESSLER & HASSLACHER CHEMICAL CO., INC. | | | PWRC |
| 4057 | RHCY | RICHANDORI COMPANY, THE | | | SCAC4 |
| 4058 | RHD | Bond Air Services Ltd. | Callsign: Red Head, Name changed to Babcock Mission Critical Services Onshore Ltd. w.e.f. 22 April 2016. | GB | AVCODES |
| 4059 | RHD | Babcock Mission Critical Services Onshore Ltd. | Callsign: Red Head, Name changed from Bond Air Services Ltd. w.e.f. 22 April 2016. | GB | AVCODES |
| 4060 | RHD | Bond Air Services | | | ICAO1 |
| 4061 | RHDA | RT TRANSPORT | | | SCAC4 |
| 4062 | RHDB | ROHNER DISTRIBUTORS INC | | | SCAC3 |
| 4063 | RHDC | RAHR DIRECT CO (BREWERS SUPPLY GROU | | | SCAC4 |
| 4064 | RHDE | RHODES SERVICE CENTER | | | SCAC3 |
| 4065 | RHDE | RHODES SERVICE CENTER | | | SCAC4 |
| 4066 | RHDG | RETTICH, DONALD | | | SCAC4 |
| 4067 | RHDI | RED HILL DELIVERY SERVICE | | | SCAC3 |
| 4068 | RHDJ | RHOADS ENERGY CORPORATION | | | SCAC4 |
| 4069 | RHDK | RICHARDSON TRUCKING | | | SCAC3 |
| 4070 | RHDL | RICHDALE CO S A PANAMA | | | SCAC4 |
| 4071 | RHDM | RICHARDS MOVING & STORAGE | | | SCAC3 |
| 4072 | RHDM | RUSH WORTH TRANSPORTATION INC | | | SCAC4 |
| 4073 | RHDN | RIEGOS HIDRAULICOS DEL NORTE S A | | | SCAC4 |
| 4074 | RHDO | RHODOS MARITIME COMPANY | | | SCAC3 |
| 4075 | RHDQ | RICHARDS TRANSPORT | | | SCAC3 |
| 4076 | RHDR | ROBICHAUD TRANSPORTATION SERVICES I | | | SCAC4 |
| 4077 | RHDS | RHODES, E R & SON | | | SCAC4 |
| 4078 | RHDT | RHODES TRUCKING CORPORATION | | | SCAC3 |
| 4079 | RHDV | RUSH DISTRIBUTION SERVICE INC | | | SCAC4 |
| 4080 | RHEA | RENTERIA HERRERA, EDGAR I | | | SCAC4 |
| 4081 | RHEB | Rheinhessische Eisenbahn | Mainz | D | privat-bahn.de |
| 4082 | RHEB | Rorschach Heiden Bergbahn | Real: RHB | CH | TRAFFIC |
| 4083 | RHEB | Rheinhessische Eisenbahn | | DE | VKM |
| 4084 | RHEC | ROCKIN H EXPRESS | | | SCAC4 |
| 4085 | RHED | RED HOT EXPEDITING INC | | | SCAC4 |
| 4086 | RHEF | RhönEnergie Fulda | | D | TRAFFIC |
| 4087 | RHEI | REHEIS INC | | | SCAC3 |
| 4088 | RHEI | RHEINLAND TRANSPORTATION LTD | | | SCAC4 |
| 4089 | RHEI | Vale of Rheidol Railway | The Vale of Rheidol Railway is a 12 mile long 1ft 11.5in gauge line in Mid-Wales, running from Aberystwyth on the coast to Devil's Bridge. It was conceived as both a mineral carrier and to catch the local day-trip trade, although for nearly all its life it has existed only as a tourist railway. It opened in 1902 as an independent company but with strong interest from the Cambrian Railways, it became part of the Great Western Railway in 1923, and then British Railways. It holds the distinctions of being the last part of BR to use steam, and was the first part to be privatised. | GB | TRAFFIC |
| 4090 | RHEING | Rheingold-Reisen-Wuppertal Blankennagel GmbH & Co. KG | | D | TRAFFIC |
| 4091 | RHEM | RHEMAN, GEO A CO INC | | | SCAC3 |
| 4092 | RHEN | RHENUS LOGISTICS BV | | | SCAC4 |
| 4093 | RHEQ | RED HAUL EXPRESS INC | | | SCAC4 |
| 4094 | RHER | RICHARD, REGINALD ENTERPRISES INC, | | | SCAC3 |
| 4095 | RHES | RICHMOND EXPORT SERVICES | | | SCAC3 |
| 4096 | RHFC | RITTENHOUSE FUEL CO, THE | | | SCAC4 |
| 4097 | RHFD | RICHFOOD INC | | | SCAC3 |
| 4098 | RHFI | RICHARDS FURNITURE COMPANY | | | SCAC3 |
| 4099 | RHFI | RUTHERFORD TRUCKING COMPANY INC | | | SCAC4 |
| 4100 | RHFJ | RICHFIELD TOURS INC | | | SCAC3 |
