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. The Sea Rangers were designed for a "boosted takeoff" by being catapulted from huge barges. Although the normal range of the aircraft was 4,245 miles, designers believed this distance could double if fuel was saved by the catapulted takeoff. However, even before the first Sea Ranger was finished, the U.S. military changed its acquisition 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."