| Abbreviation | Definition |
|---|---|
| OPSU | Sui, Pakistan |
| OPSW | Sahiwal, Pakistan |
| OPTA | Tarbela, Pakistan |
| OPTH | Talhar, Pakistan |
| OPTT | Taftan, Pakistan |
| OPTU | Turbo, Colombia |
| OPU | Belimo, Papua New Guinea |
| OPW | Opuwa, Namibia |
| OPWN | Wana, Pakistan |
| OPZB | Zhob Air Base, Pakistan |
| OQN | Brandywine Airport, West Chester, Pennsylvania USA |
| OQU | Hawthorne Aviation, North Kingstown, Rhode Island USA |
| OQW | Maquoketa, Iowa |
| ORA | Oran, Santa Ana, Argentina |
| ORB | Orebro, Sweden |
| ORBC | Baghdad-Geca, Iraq |
| ORBI | Baghdad International Airport |
| ORBS | Baghdad Saddam International, Iraq |
| ORC | Orocue, Colombia |
| ORD | O' Hare International Airport, Chicago, Illinois USA (formerly called Orchard Field) |