Quote (ChivasRegal @ May 27 2017 05:35pm)
if a pilot is holding the plane steady and the nose is NOT dipping, then it must be traveling in a straight line.....and will eventually fly off into outer space if the land below is curved and always falling away
you can't be traveling straight and curving at the same time, it is impossible, so which one is it?
the plane is flying straight over a flat landmass below, you don't need a fricken math formula, when you can verify it with your own eyes inside the cockpit
He will be flying at the same altitude above sea level. There, is that clear? It's not literally a straight line, but at any given time he's flying straight from the point of view of a ground observer directly underneath him.