The curvature of the Earth

It is alleged that Donald Trump said that he believed the world is flat. It was claimed in 2016 that he said: "“I fly a lot, and I mean a lot. No one flies more than me. Listen, I own a jet. I own a 757, beautiful plane, it’s the best plane! If the world were round, believe me, I would know!”

It was later established that he didn't say this and that the quote came from a bogus web source.  Fake news, evidently.

I'm not sure whether this will qualify for this week's fascinating Mono Monday challenge but nothing ventured, nothing gained.