All Aero

FBA-21/1 was a 4/5 seat tourer and civil amphibian, powered by one 450 hp Hispano-Suiza 12Ga engine
FBA-21/2 was a version of 21/1,powered by one 450 hp Lorraine 12Eb engine
FBA-21/3 was a flying boat/amphibian version,powered by one 420 hp Gnome-Rhône 9Ab engine
FBA-21/4 was a flying boat/amphibian version,powered by one 450 hp Lorraine 12Ed engine
FBA-210 was a little known version