| OAK |
Oakland International Airport |
| OAX |
Oaxaca Airport |
| ODB |
Cordoba Airport |
| ODE |
Odense Airport |
| ODS |
Odessa Airport |
| OER |
Örnsköldsvik Airport |
| OGG |
Kahului Airport |
| OHD |
Ohrid Airport |
| OKA |
Okinawa/Naha Airport |
| OKC |
Oklahoma City-Will Rogers World Airport |
| OKJ |
Okayama Airport |
| OLB |
Olbia-Costa Smerelda Airport |
| OMA |
Omaha-Eppley Airfield |
| OMO |
Mostar Airport |
| ONT |
Ontario Int´l Airport |
| OOL |
Coolangatta Airport - Gold Coast Airport |
| OPO |
Oporto - Francisco SA Carneiro Airport |
| ORB |
Örebro Airport |
| ORD |
Chicago - O´Hare Airport |
| ORF |
Norfolk International Airport |
| ORH |
Worcester Regional Airport |
| ORY |
Paris - Orly Airport |
| OSD |
Östersund Airport |
| OSI |
Osijek Airport |
| OSR |
Letiste Ostrava as |
| OSR |
Ostrava Int´l Airport |
| OST |
Ostend/Bruges International Airport |
| OTP |
Bucharest - Henri Coanda International Airport |
| OUA |
Ouagadougou Airport |
| OUD |
Oujda Angads Airport |
| OUL |
Oulu Airport |
| OVB |
Novosibirsk Tolmachevo Airport |
| OVD |
Asturias Airport |
| OXF |
Oxford Airport |
| OZZ |
Ouarzazate Airport |
