| Abbreviation | Definition |
|---|---|
| OSZ | Koszalin, Poland |
| OTA | Mota, Ethiopia |
| OTBD | Doha International, Qatar |
| OTD | Contadora, Panama |
| OTG | Worthington, Minnesota USA |
| OTH | North Bend Municipal Airport, North Bend, Oregon USA |
| OTI | Morotai Island, Indonesia |
| OTM | Ottumwa, Iowa USA |
| OTN | Oaktown, Indiana USA |
| OTP | Otopeni, Romania |
| OTR | Coto 47, Costa Rica |
| OTS | Anacortes, Washington USA |
| OTT | Notingham VORTAC (VHF Omni-Range navigational station/TACAN station), Nottingham, Maryland USA |
| OTU | Otu, Colombia |
| OTY | Oria, Papua New Guinea |
| OTZ | Kotzebue, Alaska USA |
| OUA | Ouagadougou, Burkina Faso |
| OUD | Oujda, Morocco |
| OUE | Ouesso, Congo |
| OUG | Ouahigouya, Burkina Faso |