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According to wikipedia, he was a superhero before becoming an astronaut, too.
In 1962, he set two world time-to-climb records while flying his Phantom II, attaining 3,000 meters (9,843 ft) from a standing start in 34.52 seconds and 25,000 meters (82,021 ft) from a standing start in 227.6 seconds
I don't know what the ceiling for a Phantom II is, but that seems like it would be above it.
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