A worker stands under the Airlander 10 hybrid airship during its unveiling in Cardington, Britain, on Monday. The U.K.-built airship-plane is 92 meters long and holding 28,316 cubic meters of helium. The Airlander’s shape gives it lift like a plane when propelled, and it can land and take off on most terrain or on water, on its pneumatic skids. It is able to stay aloft for five days. The world’s longest aircraft, spanning more than six double-decker buses, is set to make its maiden flight later this spring.SD-Agencies