It's not distances to the airport that are so important as it is which way the runways go. In Austin's case, our runways (for now at least) run parallel to downtown. Meaning that inbound and outbound flights never fly directly over downtown on approach, at least, not at altitudes low enough to cause problems.
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Originally Posted by MAC123
A supertall is not 1,000 ft. And Houston has 2.
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I agree that 984 feet is a lame threshold for what is considered to be a supertall, but officially, it is.
It's not just a Wikipedia link saying it, but rather what the Council on Tall Buildings and Urban Habitat came up with years ago. Personally, I think 1,000 feet should be the cutoff point. One Shell Plaza is 714 feet to the roof, but the huge mast on the tower actually stands on the mainroof - below 714 feet. I think I measured it at 688 feet once. Anyway, the mast goes up to 999 feet, just shy of 1,000.
https://en.wikipedia.org/wiki/Supertall_building