Boeing has unveiled its unmanned hydrogen-powered spy plane, called PHANTOM EYE, which can fly non-stop for up to four days and can remain aloft at 65,000ft. Boeing says the aircraft could eventually carry out persistent intelligence and surveillance missions. It is a product of the company's Phantom Works R&D arm.rnBoeing says the aircraft is capable of long endurance flights because of its "lighter" and "morernpowerful" hydrogen fuel system.
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