The Martin PBM Mariner is a twin-engine American patrol bomber flying boat of World War II and the early Cold War era. It was designed to complement the Consolidated PBY Catalina and PB2Y Coronado in service. A total of 1,366 PBMs were built, with the first example flying on February 18, 1939, and the type entering service in September 1940, with the last of the type being retired in 1964.

The PB2Y Coronado is a large flying boat patrol bomber designed by Consolidated Aircraft, and used by the US Navy during World War II in bombing, antisubmarine, medical/hospital plane, and transport roles. Obsolete by the end of the war, Coronados were quickly taken out of service. Only one known example remains, at the National Naval Aviation Museum at Naval Air Station Pensacola, Florida. Before WW2 large flying boats were important for long distance international routes, as the ability to land on water without a land-based airstrip was useful. It proved to be good supporting aircraft in the Pacific War, which often required transport across long distance of oceans in harm's way, to places with no prepared airstrips.