Virgin Galactic, which is the main tenant there, completed an unpowered flight of its SpaceShipTwo vehicle.
太空港的主要承租方维珍银河公司完成了其“宇宙飞船二号”飞行器的无动力飞行测试。
英语百科
Unpowered flight
Unpowered flight is the ability to stay airborne for a period of time without using any power source. There are several types of unpowered flight. Some have been exploited by nature, others by man, and some by both.
Unpowered aircraft are aerial vehicles that can fly without any propulsion mechanism.