High Quality Content by WIKIPEDIA articles! The Boeing XPBB-1 Sea Ranger was a prototype twin-engined flying boat Patrol Bomber built for the United States Navy. The order for this aircraft was cancelled to free production capacity to build the Boeing B-29, and only a single prototype was completed. Well before the USA entered World War II, the Navy started a program to develop a long-range flying boat, able to cover the vast expanse of the Pacific Ocean. The Model 344 design offered by Boeing was chosen, and a contract for 57 aircraft was awarded on 29 June 1940. The designation given to the type was PBB for Patrol Bomber, Boeing, the first aircraft of the PB category built by Boeing for the Navy. Nevertheless Boeing did have important experience in the construction of large flying boats, having produced the successful Boeing 314 airliner.

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