We cannot see monkeys turning into humans. That is the lie. The evidence for flat earth is overwhelming when you get into it. Stars and seasons actually make no sense on the globe model. For example we see the same constellations year after year, which makes perfect sense if the stars are rotating around the earth. This makes no sense if the earth is flying through space as it is in the heliocentric model. The different climates of the arctic and antarctic make no sense on a globe, they should be much more similar. I don't know why you think you saw curvature. Maybe it's because it's what you were expecting to see. Maybe the shape of the window made it appear curved. I have been in planes and have never seen it. There is even high altitude balloon footage that shows a perfectly flat horizon.

There are so many proofs. No detectable motion, being able to bring boats and other objects back into view that should have disappeared over the horizon. The sun is clearly local and moves across the earth. You can tell by watching a time lapse of a sunset and zooming in on it. Why does Nasa gives us cgi photos of the earth? Water always remains level and the oceans sticking to the globe is impossible without gravity, which cannot be demonstrated or proven, or verified.

I have heard that the windows are fish eyed. Have you sky dived and seen the curve?