| 1 | OTR | Orient Airlines | Callsign: Orientroc, | SUD | AVCODES |
| 2 | OTR | Orient Airlines | | | ICAO1 |
| 3 | OTR | The Oakland Terminal Ry. | 1/1975-7/2005 | | NAKINA |
| 4 | OTR | The Oakland Terminal Ry. | 1/75-7/2000 | | NRHS |
| 5 | OTR | OAKLAND TERMINAL RLWY | | | PWRC |
| 6 | OTR | Oakland Terminal Railway | | | RSRV |
| 7 | OTRA | ONE ONE THREE EIGHT NINE TWO THREE | | | SCAC4 |
| 8 | OTRB | ORTIZ TRANSPORTATION SERVICES LLC | | | SCAC4 |
| 9 | OTRC | OVERSEAS TRANSPORTATION CO | | | PWRC |
| 10 | OTRC | OTR RECYCLING | | | SCAC4 |
| 11 | OTRD | OVER THE ROAD TRUCKING INC | | | SCAC3 |
| 12 | OTRD | ON THE ROCKS ENTERPRISES INC | | | SCAC4 |
| 13 | OTRE | O T R EXPRESS INC | | | SCAC3 |
| 14 | OTRE | OTR LOGISTICS INC | | | SCAC4 |
| 15 | OTRF | OTTO TRANSFER INC | | | SCAC4 |
| 16 | OTRG | OUTBOUND TRUCKING INC | | | SCAC3 |
| 17 | OTRG | OLIVER, T R TRUCKING INC | | | SCAC4 |
| 18 | OTRI | ORANGEVILLE TRAILERS | | | SCAC4 |
| 19 | OTRK | OTRA TRUCKING | | | SCAC3 |
| 20 | OTRL | ON-TRUX LTD | | | SCAC4 |
| 21 | OTRN | ORTRAN INCORPORATED | | | SCAC4 |
| 22 | OTRO | ONE THREE FOUR NINE ONE SIX FIVE (1 | | | SCAC4 |
| 23 | OTRR | OVER THE ROAD SERVICES INC | | | SCAC3 |
| 24 | OTRR | OAKRIDGE TRANSPORT | | | SCAC4 |
| 25 | OTRS | OMNI TRANSERVE | | | SCAC3 |
| 26 | OTRV | OTR REPAIR SERVICE | | | SCAC3 |
| 27 | OTRV | OVER THE ROAD LOGISTICS | | | SCAC4 |
| 28 | OTRX | On-Track Railway Services Ltd. | 7/2000-7/2005 (not listed) | | NAKINA |
| 29 | OTRX | On-Track Railway Services Ltd. | Jul-00 | | NRHS |
| 30 | OTRX | ON-TRACK RAILWAY SERVICES LIMITED | | | PWRC |
| 31 | OTRX | On-Track Railway Services | | | RSRV |
| 32 | OTRX | ON-TRACK RAILWAY SERVICES LTD | | | SCAC4 |
| 33 | OTRY | OTTERY TRANSPORTATION INC | | | SCAC4 |
