| RAB | Rila Air | ||
| RAM | AT | 147 | Royal Air Maroc |
| RAN | Renan Air | ||
| RAR | DW | Aviaross Air Company | |
| RAT | Ratioflug | ||
| RAV | Reed Aviation | ||
| RAX | Royal Air Freighters | ||
| RBA | BI | 672 | Royal Brunei Airlines |
| RBH | JT | Regal Bahamas International Airways | |
| RBN | Red Baron Express | ||
| RBO | Rainbow Cargo Express | ||
| RCG | Royal Air Cargo | ||
| RCN | 765 | Imperial Cargo Airlines | |
| RDL | Road-Air Lines | ||
| RDN | D7 | 429 | Dinar Lineas Aereas |
| RDS | Rhoades International | ||
| REA | RE | Aer Arann | |
| REJ | Imperial Airlines | ||
| REU | UU | 760 | Air Austral |
| RFR | RR | Royal Air Force | |
| RGA | 7S | Region Air | |
| RGI | YS | 982 | Regional |
| RGL | FN | Regional Airlines (Morocco) | |
| RGS | Renown Aviation | ||
| RIA | JN | Rich International Airways | |
| RIG | GV | 248 | Riga Airlines |
| RIL | Regional Air | ||
| RJA | RJ | 512 | Royal Jordanian |
| RKA | RK | 092 | Air Afrique |
| RKH | RK | Royal Khmer Airlines | |
| RLB | 8H | Highland Airways | |
| RLC | 450 | Avial Air Company | |
| RLD | RW | 586 | RAS Fluggesellschaft |
| RLK | Air Nelson | ||
| RLN | Ruslan Airlines | ||
| RLT | Reliant Airlines | ||
| RLV | Real Aviation | ||
| RME | R3 | 956 | Armenian Airlines |
| RML | MV | 904 | Armenian International Airways |
| RMV | WQ | 534 | Romavia |
| RMY | Ramair | ||
| RNA | RA | 285 | Royal Nepal Airlines |
| RNL | QL | 383 | Aero Lanka |
| RNV | U8 | 669 | Armavia |
| ROA | 384 | Reno Air | |
| ROI | 9V | 742 | Avior Airlines |
| ROM | BQ | 926 | Aeromar |
| RON | ON | 123 | Air Nauru |
| ROS | ATS Aviation Transport Services | ||
| ROT | RO | 281 | TAROM-Romanian Air Transport |
| ROY | QN | 498 | Royal Cargo |
| RPA | RW | 052 | Republic Airlines |
| RPB | P5 | 845 | Aerorepublica SA |
| RPH | RH | RPX Airlines | |
| RPK | Royal Airlines | ||
| RPX | BAC Express Airlines Ltd | ||
| RQX | RQ | 834 | Swisswings Airlines |
| RRA | Royal Rwanda Airlines | ||
| RRM | WZ | Acvila Air-Romanian Carrier | |
| RSE | 952 | SNAS Worldwide Express | |
| RSH | S2 | JetLite | |
| RSI | YI | 806 | Air Sunshine |
| RSL | SL | 293 | Rio-Sul Servicos Aereos Regionais SA |
| RSN | ZC | 141 | Royal Swazi National Airways |
| RSO | E4 | 532 | Aero Asia International |
| RSR | Aeroservice | ||
| RSZ | Air Service Hungary | ||
| RTL | WE | 915 | Rheintalflug Seewald |
| RTM | 7T | 144 | Trans Am |
| RUA | Rwanda Airlines | ||
| RUC | RUTACA Rutas Aerreas Compania Anonima | ||
| RUM | Air Rum | ||
| RUN | ACT Airlines | ||
| RUR | RUSS Air Transport Company | ||
| RUS | C9 | 251 | Cirrus Airlines |
| RUT | Routair Aviation Services | ||
| RVL | DO | 965 | Air Vallee |
| RVV | RV | 338 | Reeve Aleutian Airways |
| RWA | Rwanda Airways | ||
| RWD | WB | 459 | Rwandair Express |
| RWG | RX | 594 | Redwing Airways |
| RWZ | Royal Wings | ||
| RXM | Remex Airline | ||
| RXR | Y5 | Arax Airways | |
| RYN | HS | Ryan International Airlines | |
| RYR | FR | 224 | Ryanair |
| RZL | Z9 | 509 | Aero Zambia |
| RZO | S4 | 331 | SATA International |
| RZR | ES | Zephyr Aviation Services |