The PT-19 developed by Fairchild in 1938 to satisfy a military requirement for a rugged monoplane primary trainer, was ordered into quantity production in 1940. In addition to being manufactured by Fairchild during WW II, the "Cornell" was produced in the U.S. by the Aeronca, Howard and St. Louis Aircraft Corporations and in Canada by Fleet Aircraft, Ltd.

Some Cornells were powered by Continental radial engines and designated PT-23s, while others were produced with cockpit canopies and designated PT-26s. Altogether, 7,742 Cornells were manufactured for the AAF, with 4,889 of them being PT-19s. Additional Cornells were supplied to Canada, Norway, Brazil, Ecuador and Chile.