I guess this is a topic of interest for some. One member has mentioned this several time’s although it had nothing to do with the OP. I really don’t care what shape it is. I’ve never fell off, nor do I know anyone who has.
But I’ve taken 3 flights to Asia. 16hr flights, at least 40,000 feet cruising altitude on a 747. I’ve never noticed any curvature. I’ve criss crossed the US at least 100 times. Never seen any curvature. I’m not sure why any side of this argument is important.
Your thoughts if any?