Tags: Aircraft.
The Blériot-SPAD S.56 was a family of prototype French airliners developed in the 1920s as various refinements of the S.33 design. All S.56 versions shared two new features: the first was a newly designed all-metal wing replacing the wooden wing of earlier related designs and the second was a redesigned passenger cabin replacing the S.33’s four single seats in a row with two rows of double seats. A second access door was also added.