| cey | KCEY | Kyle-Oakley Field | - | |
|
| cfk | PACK | Chefornak | - | |
|
| cft | KCFT | Greenlee County | - | |
|
| cga | CGA | Craig | - | |
|
| cge | KCGE | Cambridge-Dorchester Rgnl | - | |
|
| NID | KNID | China Lake Naws (Armitage Field) Airport | - | |
|
| NIN | NIN | Ninilchik | Нинилчайк | |
|
| NIP | KNIP | Jacksonville | - | |
|
| NJK | KNJK | El Centro Naf Airport | - | |
|
| NOW | KNOW | Port Angeles Cgas Airport | - | |
|
| NQI | KNQI | Kingsville Nas | Кингсвилль | |
|
| nrs | KNRS | Imperial County | - | |
|
| NTU | KNTU | Oceana NAS | Океания | |
|
| NUL | PANU | Nulato Airport | Нулато | |
|
| NUQ | KNUQ | Moffett Federal Airfield | Маунтен Вью | |
|
| NUW | KNUW | Whidbey Island Naval Air Station /Ault Field/ Airport | Whidbey Island | |
|
| nvd | KNVD | Nevada Muni | - | |
|
| NXP | KNXP | Twentynine Palms (Self) Airport | - | |
|
| NXX | KNXX | Willow Grove Naval Air Station/Joint Reserve Base | Уиллоу Гроув | |
|
| NYG | KNYG | Quantico MCAF /Turner field | Квантико | |
|
| OBI | KOBI | Woodbine Muni | - | |
|
| och | KOCH | Nacogdoches a L Mangham Jr Rgnl | - | |
|
| OEB | KOEB | Branch County Memorial Airport | - | |
|
| oeo | KOEO | L O Simenstad Muni | - | |
|
| oga | KOGA | Searle Field | - | |
|
| oic | KOIC | Lt Warren Eaton | - | |
|
| OKH | KOKH | Aj Eisenberg | - | |
|
| OKM | KOKM | Okmulgee Rgnl | Окмулги | |
|
| oks | KOKS | Garden County | - | |
|
| okv | KOKV | Winchester Rgnl | - | |
|
| old | KOLD | Dewitt Fld, Old Town Muni | - | |
|
| ole | KOLE | Cattaraugus County-Olean | - | |
|
| OLS | KOLS | Nogales International Airport | Ногалес | |
|
| OLU | KOLU | Columbus Municipal Airport | Колумбус | |
|
| oly | KOLY | Olney-Noble | - | |
|
| omk | KOMK | Omak | - | |
|
| ONA | KONA | Winona Municipal | Вайнона | |
|
| onl | KONL | O'Neill Municipal | - | |
|
| ONP | KONP | Newport Municipal Airport | Ньюпорт | |
|
| ony | KONY | Olney Muni | - | |
|
| ooa | KOOA | Oskaloosa Muni | - | |
|
| OPF | KOPF | Opa-locka Executive Airport | - | |
|
| OPL | KOPL | Parish-Ahart Fld | Опелусас | |
|
| OQN | KOQN | Brandywine Airport | - | |
|
| OQU | KOQU | Quonset State Airport | - | |
|
| orc | KORC | Orange City Muni | - | |
|
| ori | ORI | Port Lions | - | |
|
| ORL | KORL | Orlando Executive Airport | Орландо | |
|
| OSC | KOSC | Oscoda Wurtsmith Airport | Оскода | |
|
| osx | KOSX | Kosciusko-Attala County | - | |
|