The Boeing XPBB-1 Sea Ranger, or the Model 344, built for the U.S. Navy, was an extremely long-range flying boat patrol bomber. It was the largest twin-engine airplane built until the time of its first flight in 1942. It used a wing very similar to the four-engine B-29 bomber and incorporated aerodynamic features of the Boeing Model 314 Clipper. However, even before the first Sea Ranger was finished, it was surrounded by rows of B-29 bombers because the U.S. military changed its strategy in favor of land-based bombers after the Battle of Midway, June 4, 1942, when American bombers destroyed four Japanese aircraft carriers. Only one Sea Ranger was built and nicknamed the "Lone Ranger."