| 201 | OBCX | NEATSFOOT OIL REFINERIES CORP. | | | PWRC |
| 202 | OBDC | ORANGE & BLUE DISTRIBUTING COMPANY | | | SCAC3 |
| 203 | OBDE | OBION DENTON COMPANY | | | SCAC3 |
| 204 | OBDS | ORME, BILL DELIVERY SERICES INC | | | SCAC4 |
| 205 | OBDU | OLD BUSHMILLS DISTILLERY, LTD | | | SCAC3 |
| 206 | OBE | Air Bee S.p.A. | IATA: BM, Suspended operations 10 September 2008. | I | AVCODES |
| 207 | OBEA | OBES, ANDREW SON | | | SCAC3 |
| 208 | OBED | OBER, DOUG | | | SCAC3 |
| 209 | OBEL | OBELE TRUCKING | | | SCAC3 |
| 210 | OBEL | ONTARIO BELTING LTD | | | SCAC4 |
| 211 | OBEM | OBERMEIR, GEORGE RUDOLPH | | | SCAC3 |
| 212 | OBEN | OBRIEN TRUCKING CO INC | | | SCAC3 |
| 213 | OBEP | OCEAN BLUE EXPRESS INC | | | SCAC4 |
| 214 | OBET | OBERT TRUCKING COMPANY | | | SCAC3 |
| 215 | OBEV | Osning-Bahn e.V. | | DE | VKM |
| 216 | OBFR | OBRIEN FREIGHT SYSTEMS INC | | | SCAC3 |
| 217 | OBFR | ORANGE BLOSSOM FARM | | | SCAC4 |
| 218 | OBGP | OUTBOUND GROUP, THE | | | SCAC4 |
| 219 | OBHG | OPERATION BLESSING OB HUNGER STRIKE | | | SCAC4 |
| 220 | OBI | Amedair Nig. Ltd. | Callsign: Amedair, | WAN | AVCODES |
| 221 | OBIG | OCEANIC BRIDGE INTERNATIONAL INC | | | SCAC4 |
| 222 | OBII | ORIGINAL BEER IMPORTING & DISTRUBUT | | | SCAC3 |
| 223 | OBIS | ORBIS LOGISTICS | | | SCAC4 |
| 224 | OBJ | Comunicacion Global Objetivo, S.L. | Callsign: Objetivo, | E | AVCODES |
| 225 | OBJ | Ohs Bruks Järnvägs museiförening | | SE | VKM |
| 226 | OBK | Amako Airlines Limited. | Callsign: Amako Air, | WAN | AVCODES |
| 227 | OBK | Amako Airlines | | | ICAO1 |
| 228 | OBKG | ORION BULKERS GMBH & CO KG | | | SCAC4 |
| 229 | OBKS | OCEAN BULK SHIPS, INC. | | | SCAC3 |
| 230 | OBL | ONEONTA BUS LINES INC | | | SCAC4 |
| 231 | OBLA | O-B LEASING | | | SCAC3 |
| 232 | OBLK | OHIO BULK TRANSFER CO | | | SCAC4 |
| 233 | OBLS | OUTER BANKS LIMOUSINE SERVICE INC | | | SCAC3 |
| 234 | OBLU | PT OCEAN BUANA LOGISTICS | | | SCAC4 |
| 235 | OBM | Aviaobshemash | Callsign: Obshemash, | RUS | AVCODES |
| 236 | OBMC | OYSTER BAY MOVING CORP | | | SCAC3 |
| 237 | OBMC | O B MACARONI CO | | | SCAC4 |
| 238 | OBMG | OSBORN MOVING | | | SCAC3 |
| 239 | OBMG | OAK BAY MARINE GROUP | | | SCAC4 |
| 240 | OBMJ | OBRIEN, MAURICE J | | | SCAC3 |
| 241 | OBMK | OBRIEN, MIKE SPECIALIZED HAULING IN | | | SCAC4 |
| 242 | OBMP | OBRIEN MOTORSPORTS | | | SCAC4 |
| 243 | OBMQ | OBRIEN MOVING AND STORAGE CO | | | SCAC3 |
| 244 | OBMR | OBERMEYER TRANSFER CO | | | SCAC3 |
| 245 | OBMS | OBRIENS MOVING & STORAGE, INC | | | SCAC3 |
| 246 | OBMV | OBRIEN MOVERS INC | | | SCAC3 |
| 247 | OBMZ | OLD BEN #21 MINE | | | PWRC |
| 248 | OBNM | OBRIENS MOVING & STORAGE | | | SCAC4 |
| 249 | OBNQ | OBORN TRANSFER AND STORAGE COMPANY | | | SCAC3 |
| 250 | OBNQ | OBORN TRANSFER AND STORAGE COMPANY | | | SCAC4 |
| 251 | OBNT | OBRIEN TRANSPORT CORPORATION | | | SCAC3 |
| 252 | OBNT | OBREGON AUTOTRANSPORTES | | | SCAC4 |
| 253 | OBNV | OBELISK NAVIGATION S A | | | SCAC3 |
| 254 | OBNV | OBELISK E N E | | | SCAC4 |
| 255 | OBPA | *RETIRED 04-15-93 ATP (580) | | | PWRC |
| 256 | OBPA | *OGDENSBURG BRIDGE & PORT AUTHORITY | | | PWRC |
| 257 | OBPA | OGDENSBURG BRIDGE & PORT AUTHORITY | | | SCAC3 |
| 258 | OBPI | OB PRODUCE INC | | | SCAC4 |
| 259 | OBPN | OSBORNE PANAMA, S.A. | | | SCAC3 |
| 260 | OBRC | OBRIEN COMPANY | | | SCAC3 |
| 261 | OBRE | OBREGON RAMIREZ, OTILIA | | | SCAC4 |
| 262 | OBRF | OBRIEN, FRANK | | | SCAC3 |
| 263 | OBRG | OBERG FREIGHT COMPANY | | | SCAC4 |
| 264 | OBRJ | OBRIEN, JOHN E | | | SCAC3 |
| 265 | OBRN | O'BRIEN&NYE CARTAGE CO | | | SCAC3 |
| 266 | OBROK | OBROKA UG (haftungsabeschränkt) | | DE | VKM |
| 267 | OBRR | OBERRY TRUCKING INC | | | SCAC3 |
| 268 | OBRR | OBREGON RUIX, ANTONIO | | | SCAC4 |
| 269 | OBRT | OBRIEN TRUCKING CO, INC | | | SCAC3 |
| 270 | OBS | Orbest Airlines, S.L. | IATA: 4O, Callsign: Orbest, IATA desigantor changed to 6O. Subsidary of Iberworld, Spain. | P | AVCODES |
| 271 | OBS | Orbest Airlines, S.L. | IATA: 6O, Callsign: Orbest, Name changed to Orbest Airlines, S.L. d/b/a iberojet. IATA desigantor changed from 4O. Subsidary of Iberworld, Spain. | P | AVCODES |
| 272 | OBS | Orbest Airlines, S.L. d/b/a iberojet | IATA: 6O, Callsign: Orbest, Name changed from Orbest Airlines, S.L. IATA desigantor changed from 4O | P | AVCODES |
| 273 | OBS | | | D | TRAFFIC |
| 274 | OBSC | OBERLE, SC0TT | | | SCAC4 |
| 275 | OBSE | OBSERVER TRANSPORTATION COMPANY | | | SCAC3 |
| 276 | OBSE | OBSERVER TRANSPORTATION COMPANY, TH | | | SCAC4 |
| 277 | OBSG | OBRIENS STORAGE COMPANY INC | | | SCAC3 |
| 278 | OBSG | OBERTO SAUSAGE COMPANY | | | SCAC4 |
| 279 | OBSH | | Real: OBS, City: Halle | DDR | TRAFFIC |
| 280 | OBSK | Omnibusbetrieb Saalkreis GmbH | Real: OBS | D | TRAFFIC |
| 281 | OBSL | OBSIDIAN SHIPPING LINES INC | | | SCAC3 |
| 282 | OBSY | OMNI BULK SYSTEMS | | | SCAC3 |
| 283 | OBT | Virgin Orbit | Callsign: Cosmic Girl, | USA | AVCODES |
| 284 | OBTB | O B TRUCKING INC | | | SCAC4 |
| 285 | OBTC | O B TRANSPORT INC | | | SCAC4 |
| 286 | OBTD | O BROTHERS TRANSPORTATION INC | | | SCAC4 |
| 287 | OBTG | OBANION TRUCKING | | | SCAC3 |
| 288 | OBTG | OCEAN BLUE TRUCKING LTD | | | SCAC4 |
| 289 | OBTI | OBRIEN TRUCKING | | | SCAC3 |
| 290 | OBTI | OUTBACK TRANSPORT INC | | | SCAC4 |
| 291 | OBTK | OSBORNE TRUCKING LIMITED | | | SCAC4 |
| 292 | OBTL | ORSCHELN BROS TRUCK LINE | | | PWRC |
| 293 | OBTM | OBRIEN, TOM TRUCKING INC | | | SCAC4 |
| 294 | OBTN | OLSEN BROS TRANSPORTATION INC | | | SCAC4 |
| 295 | OBTO | OSBORNE TRUCKING | | | SCAC3 |
| 296 | OBTP | ORILLIA-BARRIE TRANSPORT INC | | | SCAC3 |
| 297 | OBTQ | OROPEZA BROTHERS TRUCKING INC | | | SCAC4 |
| 298 | OBTR | OBRIAN TRUCKING | | | SCAC3 |
| 299 | OBTR | O'BRIEN TRANSPORTATION INCORPORATIO | | | SCAC4 |
| 300 | OBTS | ONEILL BROS TRANSFER & STORAGE CO | | | SCAC3 |
