ANALYSIS: US Air Force pushes Global Hawk upgrades on 20th anniversary

​If an aircraft's first flight is successful, the only excitement is on the ground and never in the air. So it was on 28 February 1998, with the first take-off of the Ryan Aeronautical Global Hawk – a futuristic-looking demonstrator described by three key adjectives: unmanned, jet-powered and high-altitude.

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