Large flying boat, rejected by Pan Am in favour of the Boeing 314. Nicknamed 'Russian Clipper', the sole example was delivered to Leningrad by ship. Re-assembled there by July 1938. The Soviets bought a license to build the type as a bomber, but this came to naught and this prototype, designated PS-30, became CCCP-L2940 in Aeroflot's Far East division to for use on the Khabarovsk - Petropavlovsk route. It was scrapped in July 1946. Photo by: Rudy Arnold / Smithsonian Institution