| Flughafenkürzel |
Stadt / Flughafen |
| ONH |
Oneonta, NY - Oneonta Municipal Airport |
| ONN |
Onion Bay, AK |
| JIO |
Ontario, CA - Ontario Heliport |
| ONT |
Ontario, CA - Ontario International Airport |
| ONO |
Ontario, OR - Ontario Municipal Airport |
| OGM |
Ontonagon, MI - Ontonagon County Airport |
| OPL |
Opelousas, LA - St. Landry Parish Airport-Ahart Field |
| SNA |
Orange County (Santa Ana), CA - John Wayne Airport/Orange County |
| JOC |
Orange County, CA - Centerport Heliport |
| JOR |
Orange, CA - Choc Heliport |
| ORE |
Orange, MA - Orange Municipal Airport |
| OGB |
Orangeburg, SC - Orangeburg Municipal Airport |
| ODX |
Ord, NE - Evelyn Sharp Field |
| ORL |
Orlando, FL - Executive Airport |
| DWS |
Orlando, FL - Lake Buena Vista STOL |
| MCO |
Orlando, FL - Orlando International Airport |
| OVE |
Oroville, CA - Oroville Municipal Airport |
| VVV |
Ortonville, MN - Ortonville Municipal Airport-Martinson Field |
| OSB |
Osage Beach, MO - Grand Glaize-Osage Beach Airport |
| OEO |
Osceola, WI - L.O. Simenstad Municipal Airport |
| OSC |
Oscoda, MI - Oscoda-Wurtsmith Airport |
| OKS |
Oshkosh, NE - Garden County Airport |
| OSH |
Oshkosh, WI - Wittman Regional Airport |
| OOA |
Oskaloosa, IA - Oskaloosa Municipal Airport |
| OWI |
Ottawa, KS - Ottawa Municipal Airport |
| OWX |
Ottawa, OH - Putnam County Airport |
| OTO |
Otto, NM |
| OTM |
Ottumwa, IA - Ottumwa Industrial Airport |
| KOZ |
Ouzinkie, AK - Ouzinkie Airport |
| OWA |
Owatonna, MN - Owatonna Municipal Airport |
| OWB |
Owensboro, KY - Owensboro-Daviess County Airport |
| OXC |
Oxford, CT - Waterbury-Oxford Airport |
| UOX |
Oxford, MS - University-Oxford Airport |
| HNZ |
Oxford, NC - Henderson-Oxford Airport |
| OXD |
Oxford, OH - Miami University Airport |
| OXR |
Oxnard, CA - Oxnard Airport |
| OZA |
Ozona, TX - Ozona Municipal Airport |
| PFC |
Pacific City, OR - Pacific City State Airport |
| PBK |
Pack Creek, AK |
| PAH |
Paducah, KY - Barkley Regional Airport |
| PFA |
Paf Warren, AK |
| PGA |
Page, AZ - Page Municipal Airport |
| PYG |
Pageland, SC - Pageland Airport |
| PGO |
Pagosa Springs, CO - Stevens Field |
| PHK |
Pahokee, FL - Palm Beach County Glades Airport |
| PMU |
Paimiut, AK |
| PVZ |
Painesville, OH - Casement Airport |
| PCE |
Painter Creek, AK |
| PSX |
Palacios, TX - Palacios Municipal Airport |
| PSN |
Palestine, TX - Palestine Municipal Airport |