The Aero A.34 Kos was a small sports and touring biplane built in Czechoslovakia in the 1930s. It was designed in 1929. The design was similar to De Havilland Gipsy Moth. Of conventional biplane configuration wooden construction it featured wings that could be folded to allow it to be towed to and from airfields by automobile (width 2.91 m). A prototype (registration L-BASO) had an 85 hp Walter Vega radial engine.
Made by Aero Vodochody.