| 1 | OPT | Corporate Wings, Inc. | Callsign: Options, Name changed to Flight Options | USA | AVCODES |
| 2 | OPT | Flight Options | Callsign: Options, Name changed from Corporate Wings, Inc. | USA | AVCODES |
| 3 | OPT | Edgley Aircraft Ltd. | Callsign: Optica, Name changed to Optica Industries | GB | AVCODES |
| 4 | OPT | Optica Industries | Callsign: Optica, Name changed from Edgley Aircraft Ltd. | GB | AVCODES |
| 5 | OPT | Flight Options | | | ICAO1 |
| 6 | OPT | Orange Port Terminal Ry. | 7/2000-7/2005 | | NAKINA |
| 7 | OPT | Orange Port Terminal Ry. | Jul-00 | | NRHS |
| 8 | OPT | ORANGE PORT TERMINAL RAILWAY | | | PWRC |
| 9 | OPT | Orange Port Terminal Railway | | | RSRV |
| 10 | OPT | ORANGE PORT TERMINAL RAILWAY | | | SCAC4 |
| 11 | OPTARE | Optare | | GB | TRAFFIC |
| 12 | OPTC | OCEAN PORT TRANSPORT INC | | | SCAC4 |
| 13 | OPTD | OPTIMODAL INC | | | SCAC4 |
| 14 | OPTE | OPTEST EQUIPMENT INC | | | SCAC4 |
| 15 | OPTI | OBARTO PRODUCE INC | | | SCAC3 |
| 16 | OPTI | OPTIMISTIC ENTERPRISES (LUMBER DIVI | | | SCAC4 |
| 17 | OPTIS | OPTISPED, a.s. | | SK | VKM |
| 18 | OPTL | O/P TRANSPORTATION LTD INC | | | SCAC3 |
| 19 | OPTM | OPTIMUS TRANSPORT INC | | | SCAC4 |
| 20 | OPTN | OIL PATCH TRANSPORTATION INC | | | SCAC4 |
| 21 | OPTP | OPTIMUM TRANSPORTATION INC | | | SCAC4 |
| 22 | OPTQ | ON POINT TRANSPORTATION INC | | | SCAC4 |
| 23 | OPTS | O & P TRUCK SERVICE | | | SCAC3 |
| 24 | OPTT | OPTIMUM LOGISTICS INC | | | SCAC4 |
| 25 | OPTU | OPTIMODAL INC | | USA | BIC |
| 26 | OPTU | Optimodal | | | RSRV |
| 27 | OPTU | OPTIMODAL INC | | | SCAC4 |
