Bilz
Superstar
Have you ever been on a plane before? They don't fly straight at all. They are changing altitudes pretty often.I'm not even going to say I think the world is flat... but if it's so round...
How come planes fly straight and not in a downward curve when going to a country on the other side of the world though?
You're also grossly exaggerating the curvature of the earth. Planes do not fly at a speed where that would be noticeable at all.