You'd probably have to fly around the world several times before you'd arrive at your destination, unless they had runways pointing in every direction.

Would you accept turning the steering wheel just a little bit?



Ok, a real answer. For long trips, try pulling a string from point A to point B on a globe. The curvature of the earth on flat maps only looks like the route is not direct. Other than traffic routing and wind/weather routing, the path taken is usually very direct.