 {| |} the boeing 314 clipper was a long-range flying boat produced by the boeing airplane company between 1938 and 1941. one of the largest aircraft of the time, it used the massive wing of boeingâs earlier xb-15 bomber prototype to achieve the range necessary for flights across the atlantic and pacific oceans. twelve clippers were built; nine were brought into service for pan am and later transferred to the u.s. military. the remaining three were sold to boac by pan am and delivered in early 1941. (boac's 3 short s.26 transoceanic flying-boats had been requisitioned by the raf). ==design and development== thumb|the yankee clipper in 1939. pan american had requested a flying boat with unprecedented range that could augment the airline's trans-pacific martin m-130. boeing's bid was successful and on july 21, 1936, pan american signed a contract for six. boeing engineers adapted the cancelled xb-15's  wing, and replaced the  pratt & whitney twin wasp radial engines with the  wright twin cyclone.bowers december 1977, pp. 14â15. pan am ordered six more aircraft with increased engine power and capacity for 77 daytime passengers as the boeing 314a. the huge flying boat was assembled at boeing's plant 1 on the duwamish river and towed to elliott bay for taxi and flight tests. the first flight was on june 7, 1938, piloted by edmund t. "eddie" allen. at first the aircraft had a single vertical tail, and allen found he had inadequate directional control. the a
Boeing_aircraft Flying_boats Four-engined_tractor_aircraft High-wing_aircraft Pan_Am United_States_airliners_1930a1939