'Son of Blackbird': Plan for a new spy plane[ Tue, 05 Nov 2013 12:08:22 EST ]For a big chunk of the Cold War, the U.S. Air Force turned to the SR-71 Blackbird for many of its most important spy missions. The jet-black jet could fly at more than three times the speed of sound at altitudes of 85,000 feet, faster and higher than anything adversaries had to counter it.
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