Thijs Postma - Coaster - Boeing 40 Getting AboardPut some history on your table with this gouache of a Boeing 40B 4. Built in the 1920s and initially used as a mail plane and later as a passenger plane. Get aboard! This plane, the NC741K, was built in 1929 and a modified mail plane. Passengers were seated in a cargo hold with windows, chairs and a tiny door. The pilot sat in an open cockpit to preserve the feeling of flying. When the aircraft was on the ground, forward visibility was zero, but at