So, we know we can feel acceleration (e.g. the Earth is accelerating upward, and it manifests as gravity). So, how are flights from the tip of South America to the tip of Australia so short (comparable to flights from northern Canada to northern Russia)? Shouldn't we feel much greater acceleration, since we'd have to be going much faster?
A few factors all culminate to lead to the notion that flight times must take longer going from X to Y on a flat-earth model. First, you are erroneously attributing the flat-earth maps you've seen as factual maps. They are not how we think the flat-earth looks, they are simply an aid for one to understand the concept. We do not have a definitive flat-earth map as the world has only been mapped under a false round-earth model.
Granted, on a flat-earth the distances would likely be longer on the flights in question, and for this, we has jet streams to thank. They shorten the travel time on flights in the Southern Hemiplain.
Lastly, or at least the last factor I'll be addressing, the consumption of alcohol is common place on long flights and will alter ones perception of time and distance.
I think this post accurately portrays the mindset you must acquire to accept the FE. If this was even remotely true, and we were to test the distance of two points by the time taken in an airplane, would it not occur to you to check whether or not you're riding in a significantly faster aircraft one of the ways? And you're second point is so absurd, I hesitated even mentioning it. As if there are no modern ways of telling time over the ocean because anytime anyone takes a long flight they get slammed.
You had mentioned that when you first came here to read about this, you thought it was blatantly obvious that these people were off their rocker, but after a while you slowly started believing after months of reading debates. I find it funny that you have mentioned "People just accepting what their told and not /"Questioning/" it", because the types of arguments I've seen used so far are specifically targeted at people who just accept things before thinking them through. These Pseudoscience claims are so far from actuality, you barely have to gouge the surface before you realize they are all paper thin. It's like asking a creationist who claims the universe must have a creator, who the creator of god was, and you'll get this pseudoscience response, "he always existed, he doesn't need a creator" which sounds good to the average Joe who doesn't think about it, but then you realize, oh wait, that makes no bloody sense!
That is all.