B-29 Superfortress "Sentimental Journey" and fighting airplanes in Pima Air & Space Museum, Tucson

The B-29 was designed as what the Army Air Forces. The specifications called for an aircraft capable of carrying 20,000 pounds of bombs for 5,333 miles at a speed of 400 miles an hour. While it did not meet all these goals, the B-29 still carried more bombs higher, farther, and faster than any other bomber of World War II. Over 3,000 Superfortresses were built and many continued to serve the U.S. Air Force into the early 1950s as bombers, reconnaissance planes, and as refueling tankers.