If an altitude of 60,000 feet and more than 20 hours of endurance are not sufficient, we must look at the next spy-drones aircraft, seeming to have every intention to steal the job (or at least space and altitude) to satellites. Champions of "Ultra endurance" such as AeroVironment's Global Observer or Boeing's Phatom Eye plan to fly orbits - literally - up to 19.83 km (65,000 ft) in height (the...