Moving in air space is a well-defined problem, the rules of physics and traffic are clear and you can expect others to follow them.
Traffic rules are often not well defined. And even if they are, people don't follow them to the letter, so there is this kind of fuzzy, "this is how we drive here" rule set which isn't well-defined.
Traffic rules are often not well defined. And even if they are, people don't follow them to the letter, so there is this kind of fuzzy, "this is how we drive here" rule set which isn't well-defined.