O Air (OCN)
Oasis Hong Kong Airlines (OHK)
Oban Airport (EGEO)
Obera (SATO)
Ocana (LEOC)
Ocean Air (BCN)
OCEAN AIR CARGO (IXO)
Ocean Sky (UK) (OCS)
Ocean Wings Commuter Service (TUK)
Oceanair (ONE)
Ochey (LFSO)
Ocseny (LHOY)
Odessa Airlines (ODS)
Odyssey International (ODY)
Office Federal De'Aviation Civ (FOC)
Ogooue Air Cargo (GBO)
Ohakea (NZOH)
Ohio State University Airport (KOSU)
Ohio University Airport (KUNI)
Oiapoque (SBOI)
Okada Airlines (OKJ)
Okapi Airways (OKP)
Okara (OPOK)
Okay Airways (OKA)
Okierabu (RJKB)
Oklahoma Department of Public (OKL)
Olavarria (SAZF)
Olenyok Airport (UERO)
Olgii Airport (ZMUL)
Olimex Aerotaxi (OLX)
Olimp Air (KVK)
Olive Branch Muni (KOLV)
Olympia Regional Airpor (KOLM)
Olympic Airlines (OAL)
Olympic Aviation (OLY)
Oman Air (OMA)
Oman Royal Flight (ORF)
Omidiyeh (OIAJ)
Omni - Aviacao e Tecnologia (OAV)
Omni Air International (OAE)
Omniflys (OMF)
Omskavia Airline (OMS)
On Air Limited (ORL)
One Two Go Airlines (OTG)
OneChina (1CH)
Onetime Airlines Zambia (OTM)
Ontario Ministry of Health (MED)
Opal Air (OPA)
Open Skies Consultative Commis (OSY)
Open Sky Aviation (OSA)
OpenSkies (BOS)
Operadora de Lineas Ejecutivas (OLE)
Operadora de Transportes Aereo (OTP)
Operadora de Veulos Ejectutivo (OPV)
Operadora Turistica Aurora (ORR)
Operation Enduring Freedom (LLO)
Operational Aviation Services (OAX)
Optand (ESNM)
Orange Air Services (ORD)
Orange Air Sierra Leone (ORJ)
Orange Airport (YORG)
Orange Aviation (ORE)
Orbest (OBS)
Orbit Express Airlines (ORX)
Orca Air (ORK)
Orcas Island Airport (KORS)
Orchid Beach (KOKB)
Orebro Aviation (BUE)
Orel State Air Enterprise (ORM)
Orenburg Airlines (ORB)
Organizacion De Transportes Ae (OTA)
Organizacoes Mambra (OML)
Orient Air (OVV)
Orient Airlines (OTR)
Orient Airways (ORN)
Orient Thai Airlines (OEA)
Oriental Air Bridge (NGK)
Oriental Airlines (OAC)
Origin Pacific Airways (OGN)
Orinduik Airport (SYOR)
Orion Air Charter (OED)
Orion-x (OIX)
Orlan-2000 (KOV)
Ormoc Airport (RPVO)
Ornage Aircraft Leasing (RNG)
Orsa (ESNR)
Orscom Tourist Installations C (OAD)
OSACOM (JPA)
Oscar Machado Zuloaga (SVCS)
Osh Avia (OSH)
Oshawa Airport (CYOO)
Ostend Air College (OCO)
Ostfriesische Lufttransport (OLT)
Ouessant Airport (LFEC)
Oulun Tilauslento (FNL)
Our Airline (RON)
Ouro Sogui Airport (GOSM)
Out Of The Blue Air Safaris (OOT)
Ovar (LPOV)
Overberg (FAOB)
Overland Airways (OLA)
Oxaero (OXE)
Oxford Air Services (WDK)
Oxley Aviation (OAA)
Oxnard - Ventura County (KOXR)
Ozark Air Lines (OZR)
Ozjet Airlines (OZJ)
Ozuki (RJOZ)
