The B-2 stealth bomber--one of the most advanced aircraft of all time--is the direct descendant of Jack Northrop's revolutionary XB-49 flying wing, a project cancelled nearly 40 years earlier. The history of the "flying wing" is told in episode 3, "A Wing And A Prayer", the story of Jack Northrop and his dream of perfecting a practical flying wing. Originally designed in the 1950s, his project was canceled in favor of a more conventional B-36 bomber, but the low radar profile of the flying wing design makes a comeback decades later in the form of the B-2 Spirit stealth bomber. Now the elderly Northrop, confined to a wheelchair, would view the prototype of a plane inspired by his original concept.