In many respects the progenitor of the military flying boats of the 1940s and beyond was the Consolidated P2Y.1 After World War I, several U.S. aircraft companies produced flying boats, some based on the PN aircraft, which itself had been developed from the F-5L flying boat.
1. See Gordon Swanborough and Peter M. Bowers, United States Navy Aircraft since 1911 (Annapolis, MD: Naval Institute Press, 1968), 93–94; and John Wegg, General Dynamics Aircraft and Their Predecessors (Annapolis, MD: Naval Institute Press, 1990), 65–67. The latter volume is the more complete.
2. Consolidated, formed in 1923, became Consolidated Vultee in 1943 by a merger of the two firms and was acquired by General Dynamics in 1953–54.