Honduran Air Force
In 1933, New Zealander Lowell Yerex, who had flown reconnaissance flights in his Stinson Detroiter for forces loyal to Honduran President-elect Tiburcio Carías Andino in a civil war in December 1931, and subsequently founded the South American airline consortium TACA, was tasked with buying trainers and counter-insurgency aircraft for the "Escuela Nacional de Aviación" or National Aviation School, which was later to form the core of the Honduran Air Force. Following discussions between Yerex and the Stinson Aircraft Company, Robert Hall, designer of the Gee Bee Model Z racing aircraft, designed an aircraft to meet the Honduran requirement.