Fairchild 91 Baby Clipper / Jungle Clipper
Designed by Fairchild Aircraft Manufacturing Company at Hagerstown Regional Airport (HAM) for Pan American Airways as a flying-boat airliner capable of operating on the Amazon River in Brazil and Yangtze River in China. Before construction of the prototype was complete, Pan American no longer required the aircraft for China, and Fairchild modified the design for use in the tropics, nicknamed "Jungle Clipper". A Fairchild XSOK-1 scout variant was considered for the U. S. Navy (USN) but was canceled before any were built.
A total of four aircraft were built. The first protoype with retractable wing floats, and Zap flaps was later sold to the Spanish Republican Air Force, captured by Spanish Nationalists and used until 1938. The second aircraft (Fairchild 91 NC14744) and third aircraft (Fairchild 91 NC15952) were delivered to Pan American Airways and used on the Amazon River.
The fourth aircraft Fairchild 91B / XR-942-B NR777 was specially built for Richard Archbold a research associate of the American Museum of Natural History for use during his second expedition in New Guinea during 1936-1937.