Paul Allen's Stratolaunch, a giant airplane that could launch satellites, rolled out of the hangar for the first time on Wednesday in Mojave, Calif.
Jean Floyd, chief executive officer of Stratolaunch Systems Corp,, said aircraft fuel tests will soon begin.
The plane has a wingspan of 385 feet and is 238 feet from nose to tail and is 50 feet tall.
It weighs 500,000 pounds.
The idea behind the plane is that it would carry a rocket, which would be launched. And the rocket, in turn, would launch satellites.
Floyd said the first launch demonstration may take place in 2019.