The Kaiser-Fleetwings A-39 was a project by Kaiser-Fleetwings in the 1942âÂÂ1943 period for an attack aircraft powered by a single Pratt & Whitney R-2800 radial engine. It was to be armed with four .50 caliber machine guns and two 37 mm cannons, along with up to of bombs. The A-39 was canceled before any prototypes were built.