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RE: No, Getting on a plane doesn't prove the earth is round. Try again, Round-earthers!
Unless you just happen to be flying on a Concorde plane (retired 2003), you may be able to get that debatable curvature at 60,000 feet (11.3 miles). Though we can only put the argument to rest when space tourism kicks off :)
Or maybe the
Lockheed SR-71 Blackbird
One of the fastest manned jet to grace the sky.
Never did get the chance to go on a concord =(
I guess flat earther's will find a reason to refuse any space tourism. Like the government trying to remove them or somethin!
They love their conspiracies :)