http://www.washingtonpost.com/blogs/the-switch/wp/2018/04/16/it-would-be-the-worlds-largest-airplane-its-being-built-by-a-billionaire-and-its-getting-ready-to-fly/

COLORADO SPRINGS — The massive airplane that Paul Allen’s aerospace company has been building in the California desert could fly for the first time as soon as this summer, officials said.

If it flies successfully, Stratolaunch, as the plane is called, would be the largest aircraft ever to take to the skies. At 385 feet long, its wingspan is bigger than the length of a football field and larger than Howard Hughes’s World War II-era Spruce Goose.