Nearly 50 years after its first flight — and 15 years after its last — the SR-71 Blackbird still looks like the spy plane of the future.
During its Cold War heyday, the sleek rocket-plane could skim along the atmosphere at Mach 3, twice as high and more than three times as fast as commercial jet aircraft.
It could shoot high-quality photographs of secret sites from an altitude that no Soviet fighter could reach.
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