>It's why even modern flight is centered around the idea of stacking multiple 2d environments (via elevation / flight levels) and then just ignoring that 3rd dimension for the most part.
Generally you want to fly at a constant altitude because climbing and descending require energy transfers. Humans have little trouble coping with the concept of 3-dimensional flight, indicated by the enduring popularity of combat flight simulators, but aircraft that aren't built for combat physically struggle (and even in those that are, such flight demands careful energy management).
Generally you want to fly at a constant altitude because climbing and descending require energy transfers. Humans have little trouble coping with the concept of 3-dimensional flight, indicated by the enduring popularity of combat flight simulators, but aircraft that aren't built for combat physically struggle (and even in those that are, such flight demands careful energy management).