| 4301 | RI | Mandala Airlines | ICAO: MDL, Callsign: Mandala, IATA designator changed to RI. Name changed from PT. Mandala Airlines | RI | AVCODES |
| 4302 | RI | Mandala Airlines | ICAO: MDL, Callsign: Mandala, Name changed from PT. Mandala Airlines. Designator RI* reinstated by IATA | RI | AVCODES |
| 4303 | RI | PT. Mandala Airlines | ICAO: MDL, Callsign: Mandala, Name changed to Mandala Airlines. Designator RI* reinstated by IATA | RI | AVCODES |
| 4304 | RI | Rutas Internacionales Peruanas, S.A. (RIPSA) | | PE | AVCODES |
| 4305 | RI | Rahila Air | ICAO: RIH, Callsign: Rahila, | LAR | AVCODES |
| 4306 | RI | Tica Air International (Air Costa Rica) | ICAO: RII, Callsign: Tica, Subsidiary of Air Panama. Designator RI recalled by IATA. | CR | AVCODES |
| 4307 | RI | PT Rimbun Abadi Aviasi d/b/a RIMBUN AIR | ICAO: OEY, Callsign: Rimbun Air, IATA Prefix: 273, | RI | AVCODES |
| 4308 | RI | Rock Island (Chicago, Rock Island & Pacific Ry. Co.) | 7/1930-1/1980; eliminated 7/1980 | | NAKINA |
| 4309 | RI | St. Paul & Kansas City Short Line R.R. (Chicago, Rock Island & Pacific Ry.) | 8/1920-7/1923 | | NAKINA |
| 4310 | RI | St. Paul & Des Moines R.R. (Chicago, Rock Island & Pacific Ry.) | 8/1920-7/1923 | | NAKINA |
| 4311 | RI | Chicago, Rock Island & Pacific Ry. | 8/1920-7/1936 | | NAKINA |
| 4312 | RI | Des Moines, Iowa Falls & Northern R.R. (Chicago, Rock Island & Pacific Ry.) | 8/1920-7/1923 | | NAKINA |
| 4313 | RI | Choctaw, Oklahoma & Gulf R.R. (Chicago, Rock Island & Pacific Ry.) | 8/1920-7/1923 | | NAKINA |
| 4314 | RI | Choctaw, Oklahoma & Gulf R.R. (Chicago, Rock Island & Pacific Ry.) | 23-Jul | | NRHS |
| 4315 | RI | Chicago, Rock Island & Pacific Ry. | 23-Jul | | NRHS |
| 4316 | RI | Des Moines, Iowa Falls & Northern R.R. (Chicago, Rock Island & Pacific Ry.) | 23-Jul | | NRHS |
| 4317 | RI | Rock Island (Chicago, Rock Island & Pacific Ry. Co.) | 4/38-1/80; eliminated 7/80 | | NRHS |
| 4318 | RI | ROCK ISLAND [ST. PAUL & KANSAS CITY SHORT LINE RAILROAD; DES MOINES, IOWA FALLS & NORTHERN RAILROAD; CHICAGO, ROCK ISLAND & PACIFIC RAILROAD; CHOCTAW, OKLAHOMA & GULF RAILROAD] | | | PWRC |
| 4319 | RI | Chicago, Rock Island and Pacific Railroad | | | RSRV |
| 4320 | RI | Chicago, Rock Island & Pacific Railway | | USA | TRAFFIC |
| 4321 | RI&G | Chicago, Rock Island & Gulf Ry. | 7/1932-7/1936 | | NAKINA |
| 4322 | RI&G | CHICAGO, ROCK ISLAND & GULF RWY | | | PWRC |
| 4323 | RIA | Rich International Airways, Inc. | Callsign: Richair, | USA | AVCODES |
| 4324 | RIA | Rich International Airways, Inc. | IATA: JN, Callsign: Richair, | USA | AVCODES |
| 4325 | RIA | Rich International Airways, Inc. | IATA: RZ, Callsign: Richair, | USA | AVCODES |
| 4326 | RIA | Rich International Airways | | | ICAO1 |
| 4327 | RIA | Islamic Republic of Iran Railways | Real: RAI | IR | TRAFFIC |
| 4328 | RIAC | RICHARDSON & SONS TRUCKING CO | | | SCAC3 |
| 4329 | RIAD | RITE AID CORPORATION | | | SCAC3 |
| 4330 | RIAD | RIF LINE | | | SCAC4 |
| 4331 | RIAF | RENTON ISSAQUAH FREIGHTLINES INC | | | SCAC3 |
| 4332 | RIAF | Royal Indian Air Force | | IND | TRAFFIC |
| 4333 | RIAG | RELIABLE CARTAGE INC | | | SCAC4 |
| 4334 | RIAI | RIG ALL INC | | | SCAC3 |
| 4335 | RIAI | RILEY, MIKE TRUCKING | | | SCAC4 |
| 4336 | RIAL | RITCHEY, ALAN INC | | | SCAC3 |
| 4337 | RIAL | RITCHEY, ALAN INC | | | SCAC4 |
| 4338 | RIAM | RYAN INTERNATIONAL AIRLINES (MAINFR | | | SCAC4 |
| 4339 | RIAN | RICHARD, NORMAN & SONS | | | SCAC3 |
| 4340 | RIAS | REINANTE ARMADORA SA | | | SCAC3 |
| 4341 | RIAT | R I A TRUCKINNG | | | SCAC3 |
| 4342 | RIAT | RICHIE AUTO TRANSPORT INC | | | SCAC4 |
| 4343 | RIBBLE | Hanson Cement Ltd. | City: Ribblesdale | GB | TRAFFIC |
| 4344 | RIBC | RICE BROTHERS CARTAGE COMPANY, INC | | | SCAC3 |
| 4345 | RIBK | RIBKOFF, JOSEPH INC | | | SCAC4 |
| 4346 | RIBL | RICHARDS BROS TRANSPORT LTD | | | SCAC3 |
| 4347 | RIBR | RICHARDSON BROTHERS | | | SCAC3 |
| 4348 | RIBR | RIPLEY BROKERAGE INC | | | SCAC4 |
| 4349 | RIBS | RICH, BOB-SCHROEDER TRUCKING, INC | | | SCAC3 |
| 4350 | RIBS | RICH, BOB-SCHROEDER TRUCKING INC | | | SCAC4 |
| 4351 | RIBT | RELIABLE TRUCKING LLC | | | SCAC4 |
| 4352 | RIBU | RIBU CONTAINERS S.L.U | | E | BIC |
| 4353 | RIC | Richardson's Airway, Inc. | Callsign: Richardson, | USA | AVCODES |
| 4354 | RIC | ROANOKE INDUSTRIAL CENTER | | | PWRC |
| 4355 | RICB | RICHS TRANSPORTATION SERVICES INC | | | SCAC4 |
| 4356 | RICC | RAM AIR GEAR DRYER | | | SCAC4 |
| 4357 | RICD | RICHMOND TERMINAL TRUCKING CO, INC | | | SCAC3 |
| 4358 | RICD | RICHPORTER TECHNOLOGY | | | SCAC4 |
| 4359 | RICE | RICE, A C, STORAGE CORP | | | SCAC3 |
| 4360 | RICE | RICE COMPANY, THE | | | SCAC4 |
| 4361 | RICF | RICHFIELD LOGISTICS CORPORATION | | | SCAC4 |
| 4362 | RICG | RL INTERNATIONAL CORPORATION | | | SCAC4 |
| 4363 | RICH | RICHLAND TRUCKING | | | SCAC4 |
| 4364 | RICI | Rail in-Club GmbH | | CH | VKM |
| 4365 | RICJ | RICE TRUCKING INC | | | SCAC3 |
| 4366 | RICJ | RICE TRUCKING INC | | | SCAC4 |
| 4367 | RICL | RICHARDSON, LLOYD W CONSTRUCTION | | | SCAC3 |
| 4368 | RICL | ROCK IT CARGO USA LLC | | | SCAC4 |
| 4369 | RICM | RICHARDS MOTOR SERVICE, INC | | | SCAC3 |
| 4370 | RICN | RICHARDSON TRANSFER AND STORAGE CO, | | | SCAC3 |
| 4371 | RICO | RICE TRANS AND EQUIPMENT CO | | | SCAC3 |
| 4372 | RICP | RICHMOND PIGEON CARRIERS, INC | | | SCAC3 |
| 4373 | RICQ | RICHIE, BOSTON, DELUXE GENERAL HAULING, INC | | | SCAC3 |
| 4374 | RICQ | RICKS DELIVERY | | | SCAC4 |
| 4375 | RICR | RICHMOND TRANSFER AND STORAGE COMPA | | | SCAC3 |
| 4376 | RICS | RIC'S TRANSFER COMPANY, INC | | | SCAC3 |
| 4377 | RICS | RICS TRANSFER COMPANY INC | | | SCAC4 |
| 4378 | RICU | RINNEN GMBH & CO KG | | D | BIC |
| 4379 | RICU | RINNEN GMBH & CO KG INTERNATIONALE SPEDITION | | | PWRC |
| 4380 | RICU | Rinnen GMBH | | | RSRV |
| 4381 | RICU | RINNEN GMBH & CO KG | | | SCAC4 |
| 4382 | RICW | RICHS TOWING SERVICE INC | | | SCAC3 |
| 4383 | RICW | RICHS TOWING SERVICE INC | | | SCAC4 |
| 4384 | RICX | Rockwell International Corp. | 1/1994-7/2005 (not listed) | | NAKINA |
| 4385 | RICX | Rustless Iron Corp. of America | 7/1937-4/1961 (not listed) | | NAKINA |
| 4386 | RICX | Reid Ice Cream Corp. | 7/1930 | | NAKINA |
| 4387 | RICX | Rustless Iron Corp. of America | 1/52-4/61 | | NRHS |
| 4388 | RICX | Rockwell International Corp. | 1/94-7/2000 | | NRHS |
| 4389 | RICX | *REID ICE CREAM CORP. | | | PWRC |
| 4390 | RICX | *RUSTLESS IRON CORP. OF AMERICA | | | PWRC |
| 4391 | RICX | +ROCKWELL INTERNATIONAL CORPORATION | | | PWRC |
| 4392 | RICX | Rockwell International Corporation | | | RSRV |
| 4393 | RICX | ROCKWELL INTERNATIONAL CORPORATION | | | SCAC4 |
| 4394 | RICZ | RINKER CIDCO | | | PWRC |
| 4395 | RID | Ridder Avia | | | ICAO1 |
| 4396 | RIDB | RICHFIELD BLOOMINGTON TRANSFER INC | | | SCAC3 |
| 4397 | RIDD | RIDDLE CARTAGE, INC | | | SCAC3 |
| 4398 | RIDE | RIDGE TRUCKING INC | | | SCAC3 |
| 4399 | RIDE | RIDER TRUCKING LLC | | | SCAC4 |
| 4400 | RIDF | RIDGEFIELD PARK TRANSPORT CO INC | | | SCAC3 |
