In general, we send each player all the planes that their in-game map could possibly show (which is usually something like 140 statute miles by 140 statute miles).
We could one day be smarter about this and only send you everything if your map is actually open, and otherwise limit it based on your field of view. That hasn't been a priority yet, though.
Does X-Plane feature projectiles at all (guns, missiles)? If so, do those have to be sent over the network to deal with collisions with laggy hit boxes and such?
We could one day be smarter about this and only send you everything if your map is actually open, and otherwise limit it based on your field of view. That hasn't been a priority yet, though.