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Imagine an airplane so fast that if a missile was fired at it, the pilot's instructions were simple: speed up. That airplane was real. It was called the SR-71 Blackbird, and it is still, to this day, the fastest airplane ever to fly on an engine, more than fifty years after it was built.
The story starts in the early 1960s, during the Cold War, when the United States and the Soviet Union did not trust each other at all. America needed to fly a camera over Soviet territory to see what was happening, but regular spy planes kept getting shot down by missiles. So the engineers at Lockheed, led by a brilliant and famously grumpy designer named Kelly Johnson, got an impossible assignment: build a plane that could fly so high and so fast that absolutely nothing on Earth could catch it.
Kelly Johnson worked out of a secret building nicknamed Skunk Works, and what his team invented was almost science fiction. The Blackbird could fly faster than three times the speed of sound, over two thousand two hundred miles per hour, more than thirty miles a minute. It flew so high, about sixteen miles up, that pilots had to wear spacesuits, because regular air up there is too thin to breathe and the sky above them looked black, like actual outer space.
Flying that fast creates a problem most airplanes never have to deal with: heat. Friction with the air heated the Blackbird's skin to over five hundred degrees Fahrenheit, hot enough to burn your hand instantly. Regular aluminum would have gone soft and melted, so Johnson's team built the entire plane out of titanium, a metal so tough it is also used in rockets and artificial hips. The plane actually grew almost three inches longer in flight because the metal expanded from the heat, then shrank back down once it landed and cooled off.
Here is the strangest part. On the ground, the Blackbird leaked fuel, dripping right onto the runway. That was not a mistake. Engineers designed the panels with gaps on purpose, because once the plane heated up at top speed, the metal expanded and sealed those gaps perfectly tight. A plane built to fit together only when it was blazing hot was too strange an idea for anyone to believe unless they had seen it work.
The Blackbird's main trick for staying safe was not weapons or stealth tricks, it was pure speed. Enemy radar could absolutely see it coming. But by the time a missile was launched, the Blackbird was already somewhere else, and pilots really were trained, if a missile got close, to simply push the throttle forward. Over its whole flying career, no SR-71 was ever shot down by an enemy, not even once.
The Blackbird flew its last operational mission in the 1990s, retired mostly because satellites in space could finally do its spying job instead. But on its very last flight in 1990, one Blackbird flew from Los Angeles to Washington, D.C., a trip of over two thousand miles, in just over one hour and four minutes, setting a speed record that still stands today. More than fifty years after Kelly Johnson's impossible assignment, nothing built since has ever flown faster on a jet engine. The fastest plane in history was never beaten. It just retired undefeated.