The Bleriot-SPAD S.33 was a small French airliner developed soon after World War I.

A great success, the S.33 dominated its field throughout the 1920s, initially on CMA's Paris-London route, and later on continental routes serviced by Franco-Roumaine.

One interesting development was a sole example converted by CIDNA to act as a blind-flying trainer.

A set of controls was installed inside the passenger cabin, the windows of which had been blacked out.

Data from Jane's all the World's Aircraft 1924,[1] Aviafrance:SPAD S-33,[2] Flight 7 July 1921:[3]General characteristics Performance