After years of development, a gigantic, six-engine mega jet made its first test flight on Saturday in California.
The mega jet carried out its maiden voyage over the Mojave desert.
It is designed to carry into space, and drop, a rocket that would in turn ignite to deploy satellites.
It is supposed to provide a more flexible way to deploy satellites than vertical takeoff rockets because this way all you need is a long runway for takeoff.
It was built by an engineering company called Scaled Composites.
The aircraft is so big its wing span is longer than a football field, or about 1.5 times that of an Airbus A380.
Specifically, the wing span is 117 meters; that of an Airbus A380 is just under 80.
The plane flew Saturday for about two and a half hours, Stratolaunch said. Until now, it had just carried out tests on the ground.
It hit a top speed of 304 kilometers per hour (189 mph) and reached an altitude of 17,000 feet, or 5,182 meters.