http://www.uavfactory.com/news .   ^ QinetiQ press release [ dead link ] ^ New Scientist article ^ "Spies That Fly: Time Line of UAVs" . PBS NOVA . http://www.pbs.org/wgbh/nova/spiesfly/uavs.html .   ^ "Heron 1" . Israel Aerospace Industries . http://www.iai.co.il/Default.aspx?docID=16382&FolderID=18900&lang=en .   ^ AC Propulsion release describing the flight [ dead link