Letov Š-328
The Letov Š-328 was a two-seat Czechoslovak biplane, the pre-war Czechoslovak Air Force's most widely used single-engined observation and light bomber aircraft. Developed from the Š-28 family for a Finnish order that was cancelled, it entered Czechoslovak service in 1935 and 412 were built. After Germany's March 1939 occupation most were taken over by the Luftwaffe; the type also served Slovakia and Bulgaria, whose aircraft were named Vrana, and Slovak insurgents flew it against the Germans in 1944.