| 1 | OTS | Société de Taxis Aériens (SOTA) | Callsign: Sota, | RMM | AVCODES |
| 2 | OTS | Aerotresalia, S.A. de C.V. | Callsign: Tresalia, | MEX | AVCODES |
| 3 | OTS | Osaka Port Transport System | | J | TRAFFIC |
| 4 | OTS | OTS Omnia Trasporti Speciali SRL | | IT | VKM |
| 5 | OTSB | O T S ASTRACON LLC | | | SCAC4 |
| 6 | OTSC | OGDEN TRANSFER AND STORAGE COMPANY | | | SCAC3 |
| 7 | OTSC | ONLINE TRUCKING SERVICE CO | | | SCAC4 |
| 8 | OTSD | OLYMPIC TRANSPORTATION SERVICES INC | | | SCAC4 |
| 9 | OTSG | OAK TRANSPORTATION SERVICES LLC | | | SCAC4 |
| 10 | OTSH | OT SHIPPING AB | | | SCAC3 |
| 11 | OTSI | ORANGE TRANSPORTATION SERVICES INC | | | SCAC3 |
| 12 | OTSL | OVERLOAD TRACTOR SERVICE LTD | | | SCAC3 |
| 13 | OTSM | ONTARIO SCRAP METAL INC | | | SCAC3 |
| 14 | OTSN | ORIENT TARGET SHIPPING COMPANY LIMI | | | SCAC4 |
| 15 | OTSO | ONE TWO SIX TWO THREE EIGHT SIX (12 | | | SCAC4 |
| 16 | OTSON | Oiltanking Sonmarin Oy | | FI | VKM |
| 17 | OTSP | OCEAN TRANSPORTATION SERVICES | | | SCAC3 |
| 18 | OTSR | OLYMPIC AIRFREIGHT TRANSPORTATION | | | SCAC4 |
| 19 | OTSS | O T S SPA | | | SCAC4 |
| 20 | OTST | OWENS, T W & SONS TRUCKING INC | | | SCAC3 |
| 21 | OTST | ONE TWO SEVEN ONE ONE FOUR TWO (127 | | | SCAC4 |
| 22 | OTSU | OTSUKA CHEMICAL CO LTD | | | SCAC4 |
| 23 | OTSV | OTTOS SERVICENTER | | | SCAC3 |
| 24 | OTSX | On-Track Rail Services, LLC | 7/2000-7/2005 (not listed) | | NAKINA |
| 25 | OTSX | On-Track Rail Services, LLC | Jul-00 | | NRHS |
| 26 | OTSX | ON-TRACK RAILWAY SERVICES LIMITED | | | PWRC |
| 27 | OTSX | On-Track Railway Services | | | RSRV |
| 28 | OTSX | ON TRACK RAIL SERVICES LLC | | | SCAC4 |
