They could have changed the world, combat and civil aircraft so far ahead of their time that the world would now be a very different place had they been built. Featuring four documentaries, each one focusing on a revolutionary aviation project which never escaped the drawing board. Each aircraft is recreated using advanced computer graphics, and its story is told using rare archive footage and interviews with test pilots, aviation historians and engineers....

Teams must build historical planes from the earliest days of the Century of the Flight, using materials they find in a junkyard.