Weirdly, the flat earthers are mostly "right" in that discussion. Flying around the world doesn't really disprove their "theory" unless you're taking careful measurements along the way. Flying over Antarctica should do it, though.
I was pointing out that since they believe the maps are wrong , by that logic the tropic of capricorn must be longer than the tropic of cancer, and any airplane that attempts to fly this distance would fall into the ocean from lack of fuel, or land in the wrong place from incorrectly calculating distance. Even overlooking this, how many tourists have gotten lost in South Africa using their maps? Do governments south of the equator have a different definition of kilometers?