Boeing aims for five-year flights after Vulture win

http://www.flightglobal.com/articles/2010/09/16/347380/boeing-aims-for-five-year-flights-after-vulture-win.html

Boeing will redefine "long endurance" for unmanned air vehicles, having won a contract to build a solar-powered flying wing intended to stay aloft for five years at a time under the US Defense Advanced Research Projects Agency's (DARPA) Vulture programme, the Pentagon agency announced on 15 September.