06/05/2005. Remarks by Nico Braas: "The AC-4 was the most succesfull plane of Flugzeugbau A. Comte, built in some numbers between 1928 and 1930. This aircraft was registered CH-244 before Switzerland transferred to the HB-register. After the war, HB-OTO was still in use at the flying school at Kloten airfield near Zürich."