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Boeing has unveiled its unmanned hydrogen-powered spy plane which can fly non-stop for up to four days.
The high-altitude plane, called Phantom Eye, will remain aloft at 20,000m (65,000ft), according to the company.
The demonstrator will be shipped to Nasa's Dryden Flight Research Center in California later this summer to prepare for its first flight in early 2011.
Boeing says the aircraft could eventually carry out "persistent intelligence and surveillance".