Your logic is based on second hand information and looking out of the curved glass of the plane window.
What primary information do you have that you can put in front of us all? Differentiate between primary and secondary (NASA) information.
Do this: Build a rocket and fire it dead vertical (not vertical for short duration then horizontal like NASA does, and then cuts off the live feed), record it. If YOU can get it past 100 vertical miles fully recorded from launch to target height showing curvature, I will believe you.
So far one civilian has managed 72 vertical miles .. and at 72 miles, the rocket stopped dead! As for curvature, the rocket was spinning so fast that camera sensors could not adjust - negative curvature was showing.
If you want to believe what's being fed to you, without any thought and investigation yourself, then you are the fool. I, on the other hand, want to know more and come to a logical conclusion that believe another blindly. Science is not Quran. A lot of Einstein's theories are just that, theories!