On July 19, 1963, Joe Walker flew a North American X-15 rocket plane to a record altitude of 106 kilometers, qualifying him as an astronaut. The X-15 rocket plane was an extraordinary aircraft, to say the least. Over the years there have been airplanes that have stood out among the rest, for their performance, their records, their longevity or for capabilities that no planes before had mastered. Here we list 10 of these exceptional machines, real operational planes, not fantasy experimental ones, ones that caught our attention. Which fantastic airplanes would you add to the list?