> a 3-dimensional bus It's not. There are "air routes." Your plane will be delayed if they are too busy or cannot be sequenced into arrivals from the route a

> a 3-dimensional bus It's not. There are "air routes." Your plane will be delayed if they are too busy or cannot be sequenced into arrivals from the route at an appropriate rate. This happens flying into JFK and a fair amount flying out of it. Landing and takeoffs put the plane within seconds of domestic infrastructure below. It's even more controlled. Your pilot is considering all of this, plus weather deviations, along the entire journey and at the destination, before you even leave. Your '3d bus' doesn't actually exist unless you're flying private VFR. Then, and pretty much only then, can you get out there and just "fly around." Finally your "2d bus" can just stop. It can literally just stop and do nothing. Your plane cannot without significantly implicating your life.