Why would the blackbird fly so high? I looked it up and it says they can fly up to 90,000ft.
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A couple reasons:
It was a spy plane. Not only are they designed to be hard to pick up on radar, flying so high made them VERY difficult to see, and if they were detected, they were so high up, it was really hard to get to them to do anything. (Very very expensive planes, not to mention, don’t want to lose whatever intel they gathered)
Second, wind resistance. The higher in the atmosphere you go, the “thinner” the air is. If you wanna go SUPER DUPER fast, you want as little air to push against as possible. The top speed of the SR71 Blackbird was 2,193 mph (3,529kph), or at least that’s what I can find. To go so fast, high altitude, while not a requirement, REALLY helps.
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