Your question is still wrong.
If you fly from New York to Beijing, you don't fly east or west, you mostly fly north/south. Since both cities are north of the equator, by a LOT, it would be crazy to keep going all the way around.
Imagine you live on a city block, and you live next door to a coffee shop. If you walk to the coffee shop, why when you walk back do you not keep going around the block? If the block really existed, you'd walk all the way around the block, right? Since you walk back the short way, the block doesn't really exist.
See? This is crazy talk.