| 301 | RLNA | ROYAL LIMO & AIR PARCEL SERVICE | | | SCAC3 |
| 302 | RLNC | RELIANCE TRUCK COMPANY | | | SCAC3 |
| 303 | RLND | ROLAND MOVING & STORAGE | | | SCAC3 |
| 304 | RLNE | ROLANE TRANSPORTATION INC | | | SCAC4 |
| 305 | RLNK | ROAD LINK (DIV OF TAGART TRANSPORT | | | SCAC3 |
| 306 | RLNL | REDLINE LOGISTICS INC | | | SCAC4 |
| 307 | RLNO | RELIANCE TRANSPORT | | | SCAC4 |
| 308 | RLNS | R L TRANSIT INC | | | SCAC4 |
| 309 | RLNT | RELIANCE TRANSPORTATION INC | | | SCAC4 |
| 310 | RLNY | ROYAL LINES | | | SCAC3 |
| 311 | RLNZ | (CSXT) RETIRED 04-06-93 ATP (ACI 2355) | | | PWRC |
| 312 | RLO | Revilo Aerospace Ltd. | Callsign: Revilo, | WAN | AVCODES |
| 313 | RLOB | RAC LOGISTIC LLC | | | SCAC4 |
| 314 | RLOC | REVILO CORP | | | SCAC3 |
| 315 | RLOC | RELIABLE LOGISTICS | | | SCAC4 |
| 316 | RLOD | RELOAD EXPRESS INC | | | SCAC4 |
| 317 | RLOH | RELIABLE OIL & HEAT CO INC | | | SCAC4 |
| 318 | RLOJ | RBT LOGISTICS | | | SCAC4 |
| 319 | RLOM | RITTER LOGGING | | | SCAC4 |
| 320 | RLON | RED LINE LOGISTICS INC | | | SCAC4 |
| 321 | RLOO | REGIONAL LOGISTICS LTD | | | SCAC4 |
| 322 | RLOP | ROYAL LIMOUSINE OF PITTSBURGH INC | | | SCAC3 |
| 323 | RLOP | RECICLADORA LOPEZ | | | SCAC4 |
| 324 | RLOQ | ROCK LOGISTICS | | | SCAC4 |
| 325 | RLOR | ROLO TRANSPORTATION CO | | | SCAC3 |
| 326 | RLOR | ROLO TRANSPORTATION CO INC | | | SCAC4 |
| 327 | RLOS | RELOCATION SERVICES INC | | | SCAC3 |
| 328 | RLOY | RIGHTWAY LOGISTICS | | | SCAC4 |
| 329 | RLP | Airlinair | Name changed to Lease Fly during 2012. | P | AVCODES |
| 330 | RLPC | RALSTON PURINA COMPANY | | | SCAC3 |
| 331 | RLPF | ROYAL PETROLEUM COMPANY | | | SCAC4 |
| 332 | RLPG | RUSSELL LP GAS INC | | | SCAC3 |
| 333 | RLPH | RALPHS TRANSFER | | | SCAC3 |
| 334 | RLPH | RALPHS TRANSFER | | | SCAC4 |
| 335 | RLPI | RAILGATE PIGGYBACK INC | | | SCAC3 |
| 336 | RLPI | RONS LP GAS SERVICE LLC | | | SCAC4 |
| 337 | RLPL | RADIANT LOGISTICS PARTNERS LLC | | | SCAC4 |
| 338 | RLPN | RLP TRUCKING INC | | | SCAC4 |
| 339 | RLPP | Rail-Loco Pawel Plata | | PL | TRAFFIC |
| 340 | RLPR | RALPHS TRIPLE R TRUCKING INC | | | SCAC3 |
| 341 | RLPR | RAILPRO | | | SCAC4 |
| 342 | RLPX | RAIL POWER SERVICES LLC | | | PWRC |
| 343 | RLPX | RAIL POWER SERVICES LLC | | | SCAC4 |
| 344 | RLQD | RELIABLE LIQUID TRANSPORT INC | | | SCAC3 |
| 345 | RLQD | RELIABLE LIQUID TRANSPORT INC | | | SCAC4 |
| 346 | RLQG | RAPID LOGISTICA INTEGRAL S DE RL DE | | | SCAC4 |
| 347 | RLQI | RED LANE LOGISTICS INCORPORATED | | | SCAC4 |
| 348 | RLQK | R & L TRUCKING LLC | | | SCAC4 |
| 349 | RLQS | RAW LOGISTICS LLC | | | SCAC4 |
| 350 | RLR | Business Airfreight | Callsign: Rattler, | USA | AVCODES |
| 351 | RLR | Business Airfreight | | | ICAO1 |
| 352 | RLRB | R L R TRUCKING | | | SCAC3 |
| 353 | RLRF | RAIL RUNNER FREIGHT FORWARDERS CORP | | | SCAC3 |
| 354 | RLRI | ROLAR INC | | | SCAC3 |
| 355 | RLRI | ROLAR INC | | | SCAC4 |
| 356 | RLRN | RELIANT TRANSPORTATION INC | | | SCAC4 |
| 357 | RLRP | RICE, L R TRANSPORTATION SERVICES | | | SCAC3 |
| 358 | RLRR | R L CARRIERS | | | SCAC4 |
| 359 | RLRT | ROLLER TRUCKING | | | SCAC3 |
| 360 | RLRY | RUSSELL, LARRY TRUCKING CO | | | SCAC3 |
| 361 | RLS | Riga Aeronatical Institute | Callsign: Riga Institutwe, | LV | AVCODES |
| 362 | RLS | S-Air, Private Joint-Stock Aviation Company | Callsign: S-Airlines, | RUS | AVCODES |
| 363 | RLS | S-Air | | | ICAO1 |
| 364 | RLSA | ROLLS AROUND TOWN LIMOUSINE SERVICE | | | SCAC3 |
| 365 | RLSB | RLS DISRIBUTION INC | | | SCAC4 |
| 366 | RLSC | REFRIGERACION LOZANO SA DE CV | | | SCAC4 |
| 367 | RLSD | REFRIGERADOS LOGRA SA DE CV | | | SCAC4 |
| 368 | RLSE | ROBINSONS LOBSTER BAIT | | | SCAC4 |
| 369 | RLSF | ROAD LOGISTICS SOLUTIONS INC | | | SCAC4 |
| 370 | RLSG | RLS | | | SCAC4 |
| 371 | RLSH | RELIABLE SHIPPERS INC | | | SCAC3 |
| 372 | RLSI | ROSE LIMOUSINE SERVICE INC, THE | | | SCAC4 |
| 373 | RLSL | RONALD LIMOUSINE SERVICE LTD | | | SCAC3 |
| 374 | RLSN | RAL-SAN TRANSPORT CO INC | | | SCAC3 |
| 375 | RLSN | R L S INTERNATIONAL T | | | SCAC4 |
| 376 | RLSP | ROYAL LIMOUSINE SERVICE OF PRINCETO | | | SCAC3 |
| 377 | RLSP | RLS CORP | | | SCAC4 |
| 378 | RLSQ | RAYLS BROTHERS TRANSFER INC | | | SCAC3 |
| 379 | RLSR | REIMER, LESTER TRUCKING LTD | | | SCAC3 |
| 380 | RLSR | REIMER, LESTER TRUCKING LTD | | | SCAC4 |
| 381 | RLSS | RELOCATION SYSTEMS INC | | | SCAC3 |
| 382 | RLSS | RANCHO LOS SOLORIOS | | | SCAC4 |
| 383 | RLSU | RR SHIPPING PRIVATE LIMITED | | IND | BIC |
| 384 | RLSU | RAFFLES LEASE PTE LTD | | | SCAC4 |
| 385 | RLSV | ROYALTY LIMOUSINE SERVICE INC | | | SCAC3 |
| 386 | RLSX | Robert L. Shipp | added 10/1983; eliminated 1/1990 | | NAKINA |
| 387 | RLSX | Robert L. Shipp | added 10/83; eliminated 1/90 | | NRHS |
| 388 | RLSX | ROBERT L. SHIPP | | | PWRC |
| 389 | RLSX | Robert L. Shipp | | | RSRV |
| 390 | RLSX | ROBERT L. SHIPP | | | SCAC4 |
| 391 | RLSY | ROADWAY LOGISTICS SYSTEMS INC | | | SCAC3 |
| 392 | RLSY | RLS | | | SCAC4 |
| 393 | RLSZ | REDLINE STONE | | | PWRC |
| 394 | RLT | Reliant Airlines, Inc. | Callsign: Reliant, | USA | AVCODES |
| 395 | RLT | Real Tonga Airline | IATA: R4, Callsign: Real Tonga, Designator R4 recalled by IATA. | TO | AVCODES |
| 396 | RLT | Real Tonga Airline | Callsign: Real Tonga, Designator R4 recalled by IATA. | TO | AVCODES |
| 397 | RLT | Reliant Airlines | | | ICAO1 |
| 398 | RLTA | RELIABLE TRANSPORT INC | | | SCAC3 |
| 399 | RLTB | RELIABLE TRUCKING INC | | | SCAC3 |
| 400 | RLTB | R L TRANSPORTATION | | | SCAC4 |
