| 201 | ROGA | ROOF BOLT EXPRESS INC | | | SCAC4 |
| 202 | ROGB | ROGERS OIL COMPANY OF COLUMBIA INC | | | SCAC4 |
| 203 | ROGC | ROGERS CHEVROLET CO | | | SCAC3 |
| 204 | ROGD | ROGNESS, GLEN D TRUCKING | | | SCAC3 |
| 205 | ROGD | RGO | | | SCAC4 |
| 206 | ROGE | ROBLEE, GEORGE | | | SCAC4 |
| 207 | ROGF | ROGUE SPECIALTY TRANSPORT | | | SCAC4 |
| 208 | ROGG | ROMINGER, GEORGE TRUCKING | | | SCAC3 |
| 209 | ROGI | ROGERS TRUCKING INC | | | SCAC3 |
| 210 | ROGJ | RUD OIL & GAS | | | SCAC4 |
| 211 | ROGL | ROGELIO TRUCKS | | | SCAC4 |
| 212 | ROGM | RIO GRANDE TRANSPORTS INC | | | SCAC3 |
| 213 | ROGN | ROGERS, J L TRUCKING | | | SCAC3 |
| 214 | ROGO | ROGELIOS TRUCKING | | | SCAC3 |
| 215 | ROGO | ROGELIOS TRUCKING | | | SCAC4 |
| 216 | ROGQ | ROGER TRUCKING CO | | | SCAC3 |
| 217 | ROGQ | ROMYLIA E N E | | | SCAC4 |
| 218 | ROGR | ROGERS CARTAGE CO | | | SCAC3 |
| 219 | ROGR | ROGERS CARTAGE CO | | | SCAC4 |
| 220 | ROGU | RO CARGO, C.A. | | | SCAC3 |
| 221 | ROGW | ROGERS TRANSFER COMPANY | | | SCAC3 |
| 222 | ROH | Aero Gen, S.A. de C.V. | Callsign: Aerogen, | MEX | AVCODES |
| 223 | ROH | Aero Gen | | | ICAO1 |
| 224 | ROHA | ROCHA TRUCKING INCORPORATED | | | SCAC4 |
| 225 | ROHB | ROTH BROTHERS CONTRACTORS INC | | | SCAC3 |
| 226 | ROHC | RONALD HAULING COMPANY | | | SCAC3 |
| 227 | ROHC | ROAD HOUSE CARRIERS INC | | | SCAC4 |
| 228 | ROHDE | Rohde Verkehrsbetriebe GmbH | Real: RVB | D | TRAFFIC |
| 229 | ROHF | ROYAL HAWAIIAN FORWARDING | | | SCAC3 |
| 230 | ROHG | ROSE, H G MOVING & STORAGE, FLUSHIN | | | SCAC3 |
| 231 | ROHG | RONCO OILFIELD HAULING LTD | | | SCAC4 |
| 232 | ROHH | ROACH, HAROLD H INC | | | SCAC3 |
| 233 | ROHJ | Ringkøbing - Ørnhøj - Holstebro Jernbane (Ørnhøjbanen) | 1925 - 1961 | DK | TRAFFIC |
| 234 | ROHK | ROCHESTER TRUCKING INC | | | SCAC4 |
| 235 | ROHM | ROHMER TRUCKING COMPANY | | | SCAC4 |
| 236 | ROHN | R O H L TRANSPORT | | | SCAC3 |
| 237 | ROHP | ROGERS, PHILLIP F | | | SCAC3 |
| 238 | ROHP | ROHAM EXPRESS | | | SCAC4 |
| 239 | ROHQ | ROHN, JAMES C | | | SCAC3 |
| 240 | ROHR | ROHRBAUGH, RODNEY TRUCKING INC | | | SCAC4 |
| 241 | ROHS | ROTH & SONS TRUCKING INC | | | SCAC3 |
| 242 | ROHT | ROHMAN TRUCK | | | SCAC3 |
| 243 | ROHT | RAHNS OIL & PROPANE INC | | | SCAC4 |
| 244 | ROHV | ROCHESTER VAN & STORAGE | | | SCAC3 |
| 245 | ROHW | ROHTSTEIN CORP | | | SCAC3 |
| 246 | ROHW | Friedrich Rohwedder GmbH | | DE | VKM |
| 247 | ROI | Aviones de Oriente, C.A. (AVIOR) | IATA: 3B, Callsign: Avior, Designator 3B reinstated by IATA | YV | AVCODES |
| 248 | ROI | Aviones de Oriente, C.A. (AVIOR) | IATA: 9V, Callsign: Avior, IATA Prefix: 742, Designator 3B recalled by IATA | YV | AVCODES |
| 249 | ROI | Avior Airlines | | | ICAO1 |
| 250 | ROIF | ROI RECREATION OUTFITTERS INC | | | SCAC4 |
| 251 | ROIH | RAMSEY OIL | | | SCAC4 |
| 252 | ROII | RADO INTERNATIONAL INC | | | SCAC4 |
| 253 | ROIL | RADIANT OIL C | | | SCAC3 |
| 254 | ROIN | ROSENS INC | | | SCAC3 |
| 255 | ROIN | ROSENS INC | | | SCAC4 |
| 256 | ROIO | REBEL OIL CO INC | | | SCAC4 |
| 257 | ROIP | ROCHESTER INDEPENDENT PACKER, INC | | | SCAC3 |
| 258 | ROIQ | ROGERS, A G INC | | | SCAC3 |
| 259 | ROIR | ROAD ISLAND RED | | | SCAC3 |
| 260 | ROIR | ROMAN IRIBE, OSCAR | | | SCAC4 |
| 261 | ROIT | ROBBINS TRANSPORT INC | | | SCAC3 |
| 262 | ROIX | Shintech Inc. | added 10/1974; 1/1975-7/2000; eliminated 4/2001; 7/2005 (not listed) | | NAKINA |
| 263 | ROIX | Shintech Inc. | added 10/74; 1/75-7/2000; eliminated 4/2001 | | NRHS |
| 264 | ROIX | SHINTECH INC | | | PWRC |
| 265 | ROIX | Shintech | | | RSRV |
| 266 | ROIX | SHINTECH INC | | | SCAC4 |
| 267 | ROJ | Royal Jet | Callsign: Royaljet, | UAE | AVCODES |
| 268 | ROJ | Royal Jet | | | ICAO1 |
| 269 | ROJE | RONAN, J E TRUCKING | | | SCAC3 |
| 270 | ROJF | REDS OF JAFFREY LLC | | | SCAC4 |
| 271 | ROJH | ROSE, J H TRUCK LINE CO | | | SCAC3 |
| 272 | ROJI | ROESNER, JIM GENERAL TRUCKING INC | | | SCAC3 |
| 273 | ROJI | ROBERTS, ORVAL TRUCKING LTD | | | SCAC4 |
| 274 | ROJJ | ROUNTREE, JOHN BYRUM JR | | | SCAC3 |
| 275 | ROJM | ROMAN OIL COMPANY | | | SCAC4 |
| 276 | ROJT | ROJO TRUCKING INC | | | SCAC4 |
| 277 | ROJW | ROGERS, J W, INC | | | SCAC3 |
| 278 | ROK | National Airlines | Callsign: Red Rock, Founded in 1998. Commenced operations on 27 May 1999. Ceased opertions on 06 November 2002. | USA | AVCODES |
| 279 | ROK | Red Rock Flight School | Callsign: Red Rock, | USA | AVCODES |
| 280 | ROK | National Airlines | IATA: N7 | | ICAO1 |
| 281 | ROKA | ROKA | | | SCAC3 |
| 282 | ROKB | ROYAL TRUCKING | | | SCAC4 |
| 283 | ROKC | ROCKY MOUNTAIN TRUCKING | | | SCAC3 |
| 284 | ROKC | R O C TRUCKING INC | | | SCAC4 |
| 285 | ROKE | ROANOKE OIL DISTRIBUTORS INC | | | SCAC4 |
| 286 | ROKEM | KEMWATER CRISTAL SRL | | RO | VKM |
| 287 | ROKG | ROYAL CITY TRUCKING | | | SCAC4 |
| 288 | ROKL | ROK TRUCK LINES INC | | | SCAC3 |
| 289 | ROKL | ROK LOGISTICS | | | SCAC4 |
| 290 | ROKN | RAST, OSCAR TRUCKING CO | | | SCAC3 |
| 291 | ROKQ | ROARK TRUCKING CO | | | SCAC3 |
| 292 | ROKS | ROBINSON, KARL S TRUCKING COMPANY I | | | SCAC3 |
| 293 | ROKS | ROBINSON, KARL S TRUCKING COMPANY I | | | SCAC4 |
| 294 | ROKT | ROMEOS TRUCKING LTD | | | SCAC4 |
| 295 | ROKX | Alpha Crushed Stone, Inc. | added 7/1972; eliminated 10/1974 | | NAKINA |
| 296 | ROKX | Alpha Crushed Stone, Inc. | eliminated 10/74 | | NRHS |
| 297 | ROKX | *ALPHA CRUSHED STONE, INC. | | | PWRC |
| 298 | ROKX | +CAROLINA POWER & LIGHT CO. d/b/a PROGRESS ENERGY, INC. | | | PWRC |
| 299 | ROKX | CAROLINS POWER & LIGHT D/B/A PROGRE | | | SCAC4 |
| 300 | ROKY | ROCKY MOUNTAIN SUPPLY INC | | | SCAC4 |
