Letiská
- HDHDillingham AirfieldOahu
- Oak Harbor2 letiská
- ODWOak Harbor
- NUWWhidbey Island NAS (Ault Field)
- ODCOakdaleOakdale
- Oakland2 letiská
- JCEConvention Center H/P
- OAKOakland International Airport
- OBTOakland/Coliseum StatOakland, MD
- OTNGreenOaktown
- OCFTaylor FieldOcala
- OCEMunicipalOcean City
- OCAOcean ReefOcean Reef
- NTUNASOceana
- OCIOceanicOceanic
- OCNMunicipalOceanside
- ODTOdessa Schlemeyer FieldOdesa
- OGASearle FieldOgallala
- Ogden2 letiská
- HIFHill Afb
- OGDMunicipal
- OGSOgdensburgOgdensburg
- OILSplane MemorialOil City, PA
- OBECountyOkeechobee
- Oklahoma City4 letiská
- DWNDowntown Airpark
- TIKTinker AFB
- PWAWiley Post
- OKCWill Rogers World Airport
- OKMOkmulgeeOkmulgee
- Olathe, KS2 letiská
- OJCJohnson County Executive
- JCINew Century Aircenter Airport
- OLHOld Harbor SPBOld Harbor
- OLDOld TownOld Town
- OLEMunicipalOlean
- KOYOlga Bay SPBOlga Bay
- OLVOlive Branch ArptOlive Branch
- Olney2 letiská
- ONYOlney
- OLYOlney-Noble
- OLMOlympiaOlympia
- Omaha3 letiská
- OMAEppley Airfield
- MIQMillard
- OFFOffutt Air Force Base
- OMKMunicipalOmak
- ONLMunicipalOneill
- ONHMunicipalOneonta
- ONNOnion BayOnion Bay
- ONTOntario InternationalOntario
- IUACanandaiguaOntario County IDA
- ONOOntario Municipal AirportOntario, OR
- OPLSt Landry ParishOpelousas
- JORThe City HeliportOrange
- OGBMunicipalOrangeburg
- Orlando2 letiská
- ORLOrlando Executive
- MCOOrlando International
- OVEOrovilleOroville
- OSBOsage BeachOsage Beach
- OEOMunicipalOsceola
- OSCWurtsmith AFBOscoda
- Oshkosh2 letiská
- OKSOshkosh
- OSHWittman Field
- OOAMunicipalOskaloosa
- OTMIndustrialOttumwa
- KOZOuzinkie SPBOuzinkie
- OWAOwatonnaOwatonna
- OWBDaviess CountyOwensboro
- Oxford2 letiská
- OXDMiami University
- UOXUniversity-Oxford
- OXCWaterbury-oxfordOxford, CT
- Ozark2 letiská
- OZRCairns AAF
- HEYHanchey Army Heliport
- LORLowe Army HeliportOzark, AL
- OZAOzona MunicipalOzona