1. B-29 Superfortress

Plane Type: Long-Range Heavy Bomber
Fought For: Allies
Complex Says: Three separate companies built B-29 Superfortresses during WWII, based on a design submitted to the U.S. Army by Boeing in 1939--before the U.S. entered the war. Boeing built 2,766, while Bell built 668 and Martin built 536. The Soviets copied the design and called their version the Tupolev Tu-4. Roughly 1,000 Superfortresses flew in the Pacific combat theater at a time. These came armed with 12 .50-cal machine guns, one 20mm cannon, and a 20,000-pound bomb load. The most famous B-29 of all was the Enola Gay, which dropped an atomic bomb on Hiroshima on August 6, 1945. A second B-29, named Bockscar, dropped a second atomic bomb on Nagasaki three days later. [Photo courtesy of the U.S. Air Force.]