[1] The Ca.310 was purchased in small numbers by the Regia Aeronautica (Italian Air Force), and by several export customers, including Peru, Hungary and Norway.

[2] The Ca.312 was accepted by Norway as a replacement for the remainder of its Ca.310s (only four of which had been delivered),[3] while 24 more were ordered by Belgium for service in the Belgian Congo.

The prototype, a converted Ca.310, powered by two 770 hp (570 kW) Isotta-Fraschini A.120 I.R.C.C.40 engines, first flew on 22 December 1939.

The co-pilot also had the duties of observer/bomb-aimer (with a station in the aircraft's nose) and manning the dorsal gun turret.

[17] In 1942, Germany ordered 905 Ca.905G, based on the R.P.B.2 but with more powerful engines, for use as crew trainers for bombers.

[18] None of the Norwegian or Belgian Ca.212s were delivered before the German invasions of Norway and Belgium, with the Ca.312s being used by the Regia Aeronautica as transports and liaison aircraft.

[22] The aircraft served mainly with Italy, in the light transport, trainer and maritime reconnaissance roles.

In the late 1930s, Sweden had an urgent requirement to build up its airforce, with one of the required types a twin engined bomber to act as an interim replacement for the obsolete Junkers Ju 86 (built by Sweden as the B 3) while the Saab 18 could be developed.

The outbreak of war greatly hindered attempts to buy an aircraft to meet this requirement, with an order for 16 Bréguet 694s being cancelled at the start of the war, and an attempt to buy Dornier Do 215s from Germany also failing.

The Luftwaffe eventually ordered 905 machines called the CA.313G to be used for training purposes and other secondary employment, but only 117 planes were delivered.

In 1942, Croatia received ten Caproni Ca 311M bombers which had been ordered and paid for by the former Royal Yugoslav government.

A full size replica built in Sweden for a TV miniseries using some original parts was put in the Flygvapenmuseum, Linköping after filming was completed.