I consider this a clear case of pathological skepticism. Or perhaps more charitably, naive skepticism. A professional 747 pilot has set up a kickstarter to charter a passenger jet to fly from Rio de Janeiro to Perth, passing over Antarctica, to prove to flat-earthers that the Earth is spherically, or at least, that Antarctica isn’t an ice wall surrounding the rim of a disc-shaped earth. Why would you think that this, on top of all the far easier to obtain evidence, is the final clincher to convince a tiny group of delusional ranters that they are wrong?
It’s going to cost $1.5 million dollars to book this 16 hour flight, and it’s all supposedly for the benefit of educating flat earthers. Buy them a good introductory physics book instead. It’s less flashy, but probably more likely to work, given that this isn’t going to work at all.
Skeptics ought to be familiar with studies of the end-of-the-world cults, in which a prophet predicts armageddon or the rapture or some such nonsense to occur on a specific date, and the cultists gather and pray and wait and…nothing happens. It turns out that they don’t instantly drop their beliefs, which were socially expensive to acquire — getting ostracized by the out-group hurts — and which gave them the benefit of being valued by the in-group. Instead, they rationalized (that is, made excuses) and believed even more firmly. The flat-earthers are also a gang of conspiracy theorists who will invent various subterfuges that were made to undermine the truth by the pilot, who is obviously part of the plot.
It’s apparent that the flat-earthers don’t believe in their delusion because they’ve used science, so why would you imagine science would get them to think otherwise? Also, even a glance at most flat-earth literature will reveal that it’s all paranoid religious gobbledy-gook, and they aren’t going to be dissuaded by an airplane ride.
There is a documentary, Behind the Curve, about these fanatics. They are repeatedly shown evidence that demonstrate they are wrong, and they even design their own experiments to prove the earth is flat which consistently fail. They don’t change their minds. This is more of the same, only with a $1.5 million price tag, and it’s going to be another exercise in futility.