Martin 156

The Martin 156, called the Russian Clipper or Moscow Clipper in the press, was a large four-engined flying boat built by the Glenn L. Martin Company as a single example for trans-Pacific airline service. Pan American Airways had asked for a longer-range successor to the Martin M-130, and the design kept the parasol wing layout but grew its wingspan by more than 27 feet and used 1,000 horsepower Wright Cyclone radials. Pan Am chose the Boeing 314 instead, so Martin sold the aircraft and its production plans to the Soviet Union in 1937. Aeroflot flew it as the PS-30 on Far East routes from 1940 and scrapped it in 1944.