The prototype Caudron C.630 Simoun first flew in 1935. The plane proved fast, well equipped for flight in poor visibility and a the dihedral wing gave a great guarantee of stability making it very popular with pilots. This plane was delivered to the postal company Air Bleu in August 1935 and went on to fly with an unknown owner with the registration CS-ADG.

This was a 1930s touring aircraft. It was used for mail flights and as a liaison aircraft during WW II

12 Simoun (Sandstorm) aircraft served with LBG-based air-mail company Air Bleu in the late 1930s, carrying a crew of two and up to 200 kg (440 lb) of mail.