The Boeing B-47 Stratojet was produced in larger numbers than any post World War II American bomber. A total of 2,042 aircraft were built by the Boeing, Douglas and Lockheed aircraft companies. With more than 25 variants, the B-47 was the backbone of the Strategic Air Command throughout the 1950s. In �The Boeing B-47 Stratojet in Pictures� Mark Natola takes you from the development of the first XB-47 through the final YB-47C and B-47Z concept aircraft.