If you had any knowledge of commercial flight rules the answer is obvious, however your flat head blocks critical thinking. Non commercial flights can and do fly over Antarctica.
The flat earther argument to end all arguments is why is the sun is always overhead at noon as it supposedly orbits the sun. Grade school kids can figure this out by simple measurements, but flat heads cannot grasp simple measurements, so I will give a clue - get hold of yourself - the earth does NOT rotate 360 degrees in 24 hours, this is easy to prove, go ahead and try it, or continue to persist in your reality.