| 3301 | OSGI | OSG TWO FIVE FOUR (254) LLC | | | SCAC4 |
| 3302 | OSGJ | OSG LOGISTICS LLC | | | SCAC4 |
| 3303 | OSGK | OSG ENDURANCE LLC | | | SCAC4 |
| 3304 | OSGL | OCEANEED SHIPPING LTD | | | SCAC3 |
| 3305 | OSGL | OSG LIGHTERING LLC | | | SCAC4 |
| 3306 | OSGN | OSP FOUR ZERO ZERO (400) LLC | | | SCAC4 |
| 3307 | OSGO | OSG ONE NINE TWO (192) LLC | | | SCAC4 |
| 3308 | OSGR | ORLAND SAND & GRAVEL CORP | | | SCAC3 |
| 3309 | OSGR | OSG TWO FOUR FOUR (244) LLC | | | SCAC4 |
| 3310 | OSGS | OSG SHIP MANAGEMENT (GR) LTD | | | SCAC4 |
| 3311 | OSGT | OSGOOD TRUCKING | | | SCAC3 |
| 3312 | OSGT | OSG TWO ZERO NINE (209) LLC | | | SCAC4 |
| 3313 | OSGV | OSG TWO FIVE TWO (252) LLC | | | SCAC4 |
| 3314 | OSGW | OSG TWO ONE FOUR (214) LLC | | | SCAC4 |
| 3315 | OSGX | Oil State Gasoline Co. | 8/1920-7/1923 | | NAKINA |
| 3316 | OSGX | OIL STATE GASOLINE CO. | | | PWRC |
| 3317 | OSH | Osh Avia | | | ICAO1 |
| 3318 | OSHC | ORCHESTRA SHIPPING COMPANY LIMITED, | | | SCAC3 |
| 3319 | OSHI | OCEANSTAMINA SHIPPING LTD NICOSIA C | | | SCAC3 |
| 3320 | OSHL | OVERSEAS HOUSTON LLC | | | SCAC4 |
| 3321 | OSHM | OSHEA-MORAN TRUCKING | | | SCAC3 |
| 3322 | OSHP | OCEAN SHIPS INC | | | SCAC3 |
| 3323 | OSHP | OCEAN SHIPS INC | | | SCAC4 |
| 3324 | OSHT | Oshava Transit | | CDN | TRAFFIC |
| 3325 | OSHU | OMEGA SERVIS HOLDING | | CZ | BIC |
| 3326 | OSHU | OMEGA SERVIS HOLDING | | | SCAC4 |
| 3327 | OSHW | OVERSEAS ST HOLDING LLC | | | SCAC4 |
| 3328 | OSI | Aerosi, S.A. de C.V. | Callsign: Aerosi, | MEX | AVCODES |
| 3329 | OSII | OFFSHORE INTERIORS INC | | | SCAC4 |
| 3330 | OSIN | OCEAN SERVICE INTERNATIONAL | | | SCAC3 |
| 3331 | OSIN | | City: Osinniki | SU | TRAFFIC |
| 3332 | OSIP | OLIVINE SHIPPING INC | | | SCAC4 |
| 3333 | OSIT | OSI TRANSPORTATION | | | SCAC3 |
| 3334 | OSIT | ORGAN SUPPLY INDUSTRIES INC | | | SCAC4 |
| 3335 | OSIV | OCEAN STAR INTERNATIONAL | | | SCAC4 |
| 3336 | OSIX | OSI SPECIALTIES, INC. | | | PWRC |
| 3337 | OSJ | CA "Oscar Jet" SRL | Callsign: Oscarjet, | MD | AVCODES |
| 3338 | ÖSJ | Östra Skånes Järnvägar | 1898 - 1936 | S | svenska-lok.se |
| 3339 | OSJA | OCEAN SHIPPING SERVICE INC | | | SCAC3 |
| 3340 | OSJD | ORTA SALDANA, JOSE DANIEL | | | SCAC4 |
| 3341 | OSJS | Østsjællandske Jernbane Selskab (Østbanen) | Real: ØSJS, 1879 - 2001 | DK | TRAFFIC |
| 3342 | OSKA | OSKAM, TEUNIS | | | SCAC3 |
| 3343 | OSKI | OSTANKINO SHIPPING COMPANY LIMITED | | | SCAC3 |
| 3344 | OSKK | OSKR TRUCKING | | | SCAC4 |
| 3345 | OSKL | OSKALOOSA GRAIN LTD | | | SCAC4 |
| 3346 | OSKO | OSKALOOSA TRANSPORT | | | SCAC3 |
| 3347 | OSKP | OSTERKAMP TRUCKING INC | | | SCAC3 |
| 3348 | OSKT | OSTERKAMP TRUCKING COMPANY | | | SCAC3 |
| 3349 | OSKU | OCEANIC STAR LINE LTD | | UAE | BIC |
| 3350 | OSKU | OSK PROJEKTMANAGEMENT GMBH | | | SCAC4 |
| 3351 | OSKX | Sunray D-X Oil Co. | eliminated 10/1967 | | NAKINA |
| 3352 | OSKX | Oil States Tank Car Corp. (Sunray D-X Oil Co.) | 10/1966 | | NAKINA |
| 3353 | OSKX | Sunray D-X Oil Co. | added 7/1962; 7/1965 | | NAKINA |
| 3354 | OSKX | D-X Sunray Oil Co. | 10/1957-4/1961; eliminated 7/1962 | | NAKINA |
| 3355 | OSKX | Oil States Tank Car Corp. | 7/1935 | | NAKINA |
| 3356 | OSKX | Mid-Continent Petroleum Corp. | 7/1937-7/1954 | | NAKINA |
| 3357 | OSKX | Oil States Tank Car Corp. (Mid-Continent Petroleum Corp.) | Apr-38 | | NRHS |
| 3358 | OSKX | Mid-Continent Petroleum Corp. | Jan-52 | | NRHS |
| 3359 | OSKX | D-X Sunray Oil Co. | 10/57-4/61 | | NRHS |
| 3360 | OSKX | Sunray D-X Oil Co. | Jul-65 | | NRHS |
| 3361 | OSKX | Oil States Tank Car Corp. (Sunray D-X Oil Co.) | Oct-66 | | NRHS |
| 3362 | OSKX | Sunray D-X Oil Co. | eliminated 10/67 | | NRHS |
| 3363 | OSKX | SUNRAY D-X OIL CO. {D-X SUNRAY; MID-CONTINENT PETROLEUM CORP.} | | | PWRC |
| 3364 | OSL | Sosoliso Airlines | IATA: SO, Callsign: Sosoliso, | WAN | AVCODES |
| 3365 | OSL | Sosoliso Airlines | IATA: SO | | ICAO1 |
| 3366 | OSL | UNION PACIFIC RAILROAD [OREGON SHORT LINE] | | | PWRC |
| 3367 | OSL | Oregon Short Line (Union Pacific Railroad) | | | RSRV |
| 3368 | OSL | Oregon Short Line | | USA | TRAFFIC |
| 3369 | OSLA | OVERSEAS LOS ANGELES LLC | | | SCAC4 |
| 3370 | OSLB | OVERSEAS LONG BEACH LLC | | | SCAC4 |
| 3371 | OSLJ | Östra Södermanlands Järnväg | | SE | VKM |
| 3372 | OSLK | ONE SOURCE LOGISTICS | | | SCAC4 |
| 3373 | OSLL | ORIENT STAGE LINES LTD | | | SCAC3 |
| 3374 | OSLL | ONE SOURCE LOGISTICS LLC | | | SCAC4 |
| 3375 | OSLN | ORIENT STAR LOGIX CO LTD | | | SCAC4 |
| 3376 | OSLO | | City: Oslo | N | TRAFFIC |
| 3377 | OSLU | OSTERMANN TRANSPORTE GMBH | | D | BIC |
| 3378 | OSLU | OCEAN STAR LINE A.D. | | | SCAC3 |
| 3379 | OSLU | OCEAN STAR LINE A.D. | | | SCAC4 |
| 3380 | OSLW | ORIOLE SHIPPING LLC | | | SCAC4 |
| 3381 | OSLY | OYSTER SHIPPING LTD | | | SCAC4 |
| 3382 | OSMA | OPA'S SMOKED MEATS | | | SCAC4 |
| 3383 | OSMC | OECANSIDE MARINE CENTRE INC | | | SCAC4 |
| 3384 | OSMD | OSM SHIP MANAGEMENT PTE LTD | | | SCAC4 |
| 3385 | OSMF | O'FAHEY SDS MOTOR FREIGHT, INC | | | SCAC3 |
| 3386 | OSMH | OSM SHIP MANAGEMENT AS | | | SCAC4 |
| 3387 | OSMI | OMICRON SHIP MANAGEMENT INC | | | SCAC4 |
| 3388 | OSML | OCEAN STAR METALS | | | SCAC4 |
| 3389 | OSMO | OVERSEAS MARINE COMPANY LTD | | | SCAC4 |
| 3390 | OSMR | OCEANSYMBOL MARINE LIMITED | | | SCAC3 |
| 3391 | OSMU | KOPPERS PERFORMANCE CHEMICALS NEW ZEALAND | | NZ | BIC |
| 3392 | OSMW | ODIN SHIP MANAGEMENT | | | SCAC4 |
| 3393 | OSN | Aerosan, S.A. de C.V. | Callsign: Aerosan, | MEX | AVCODES |
| 3394 | OSN | Aerosan | | | ICAO1 |
| 3395 | OSN | Stadtwerke Osnabrück | | D | TRAFFIC |
| 3396 | OSND | ONE SEVEN NINE FOUR TWO ONE SIX (17 | | | SCAC4 |
| 3397 | OSNF | ONE SEVEN NINE THREE FIVE SIX THREE | | | SCAC4 |
| 3398 | OSNG | OSENGA TRANSPORT SYSTEM INC | | | SCAC3 |
| 3399 | OSNG | OVERSEAS LNG S1 CORPORATION | | | SCAC4 |
| 3400 | OSNK | OVERSEAS NIKISKI LLC | | | SCAC4 |
