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Maybe they have made the flight but haven't made it public, you never know, they probably file some of this stuff and seal it so nobody gets to know.

That's a good point. I would assume that to be true regardless of the shape of the earth. But there's only one vertical circumnavigation I can find, I do see some claims of others, though.. They aren't on any official lists that I can see.. And I'd have to dig deeper than I have the time for which is one reason I created this thread. Maybe someone else knows..