Airlander 10: World's longest aircraft hits highest altitude This video can not be played To play this video you need to enable JavaScript in your browser. Airlander 10: World's longest aircraft hits highest altitude Close The world's longest aircraft has reached the highest altitude it has attained so far. Airlander 10 ascended to 3,500ft (1,067m) on its fourth test flight. Based in Cardington, it is a cross between a plane and an airship and cost £25m. Developer Hybrid Air Vehicles believes it could be the future of air travel. Subsection Beds, Herts & Bucks Published 14 June 2017 Share close panel Share page Copy link About sharing Read description