BBC News - Drones: A rare glimpse at sophisticated US spy plane:"The Global Hawk is one of the US military's most sophisticated spy planes and the BBC was able to get a rare view of one at Grand Forks Airbase in North Dakota.
It can travel half-way round the world on a single tank of fuel and can can track a man on the ground, even when the earth is covered by cloud, from a height of about 18,000m - that's close to 60,000ft."
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