Oakland Airmotive
Ochoa, Victor Leaton
Odier-Vendome
Oficinas Gerais da Aviation Naval
Ogilvie, Bertram
O'Hara, Jim
Old Rhinebaek Aerodrome
Ollivier
Omnipol
One Aviation
One Design
O'Neill, Terence
On Mark Engineering Co
Opel-Sander-Hatry
Opener
Optica Industries Ltd
Ord-Hume
ORENCO / Ordnance Engineering Corp
Orlowski
Osrodek Konstruckcji Lotniczych
Ostoja-Ostaszewski
Ott & Schellenberg
Otto Werke / Gustav Otto Flugmaschinenwerke
OWAM / Oscar Wittenstein Aerodrom Milbertshofen
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