尽管目前只有IXV一个飞行器计划，当IXV从海洋中打捞并分析，会带来其他的试验飞行器的项目。
Although only one flight of the IXV is currently planned, its recovery from the ocean would allow further experimental flights to be conducted.
欧洲再入大气层试验飞行器是简单的不载人座舱式飞行器。它将随“阿里安5”火箭的第二次鉴定飞行发射升空。
The second qualification flight of Ariane - 5(V502) will carry an atmospheric Reentry Demonstrator(ARD) which is a simple unmanned capsule - type vehicle.
并且高超音速飞机目前只演示过由其他飞行器携带小型无人机至高速，而且其他计划中的试验飞行器同样太小不能坐人。
Plus, hypersonic flight has so far only been demonstrated for small unpiloted craft carried to high speed by other vehicles - and other planned experimental craft are too small to carry a pilot.
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