Eleven-fifteen-passenger commercial amphibian powered by two 559kW Pratt & Whitney Hornet engines and known as the Baby Clipper as a smaller version of the S-42. Production aircraft went into service with Pan American Airways and a number of other airlines for operations in Norway, West Africa, Russia, China, Hawaiian and Philippine islands and South America. The US Navy/ Marine Corps and USAAC also used the type as a general-purpose aircraft.