The Caproni Ca.309 was designed by Cesare Pallavicino, based on the Ca.308 Borea transport. It was intended to replace the obsolete biplane IMAM Ro.1. It was intended to serve as a reconnaissance and ground-attack aircraft.
The Ca.309 was a low-wing cantilever monoplane with a piston engine fitted to each wing.
The aircraft was also produced in Bulgaria. That variant, 24 of which were built, was known as the Kaproni-Bulgarski KB 6/KB 309 Papagal.
Read more about Caproni Ca.309: Operations, Operators, Specifications (Ca.309)