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"       Boeing&amp;#039;s secret aviation shop has released video of the second flight of its new high-endurance unmanned aerial vehicle, the Phantom Eye. Boeing is funding the the hydrogen-powered aircraft itself; it wants to offer the design in upcoming reconnaissance missions. This aircraft has a 150-ft-wingspan, but it&amp;#039;s just a demonstrator. A real UAV with 10-day flight endurance would be much larger. "^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.popularmechanics.com/flight/drones/a8696/see-boeings-hydrogen-powered-phantom-eye-take-flight-15155089/>