The Boeing X-37 (also known as the Orbital Test Vehicle) is an American unmanned vertical-takeoff horizontal-landing (VTHL) spaceplane. The X-37 is operated by the United States Air Force for orbital spaceflight missions intended to demonstrate reusable space technologies. It is a reusable robotic spaceplane that is a 120% scaled derivative of the X-40A. The X-37 began as a NASA project in 1999 then was transferred to the U.S. Department of Defense in 2004.
Made by Boeing.
It is the successor of the Boeing X-40 .