QinetiQ engineers launch the company's 'Zephyr' solar- and battery-powered aircraft from the U.S. Army's Yuma Proving Ground, Ariz., on July 28 for a flight that ended on July 31, 82 hours 37 minutes later. The aircraft flew over the Sonora Desert, at an altitude of more than 60,000 feet. British company QinetiQ claims the flight set a new unofficial world record for unmanned flight, breaking the official world record by more than 50 hours. Credit: QinetiQ