The latest entrant into the new space race has a wingspan longer than the distance traveled by the Wright Brothers in their earliest flights. Its landing gear has a total of 28 wheels. And the local county had to issue special construction permits for the scaffolding needed to build what would be the world's largest airplane. Only someone like Paul Allen -- the billionaire co-founder of Microsoft, owner of the Seattle Seahawks, dreamer and space enthusiast -- might attempt to build something like this: a twin-fuselage behemoth as wide as a football field that, fully loaded, would weigh 1.3 million pounds, be powered by six 737 engines and have 60 miles of wiring coursing through it. Called Stratolaunch, the plane would be bigger than Howard Hughes' famed Spruce Goose, which flew once, in 1947. But Allen's creation comes as the space industry is being disrupted by entrepreneurs, such as Elon Musk, Jeff Bezos and Richard Branson, who like him, aim to revolutionize space travel.