Add controlled private servers that are only opened if a moderator (atc) is online (taking a hook since aeronautica doesn't have private servers), the server could be free or a gamepass to create these servers.
Gamepasses suggestions (to not have a huge work of doing this without any reward)
Gamepass 1: AI ATC
Self-explanatory
Gamepass 2: AI Traffic
Also self explanatory
Gamepass 3: Advanced controls
Control weather, wind directions and strenght, can also add special ps events or even PvE (you already said that this was not going to be added but why not be a option? Creativity rules!)
Gamepass 4: ground crew
Again, self explanatory
This suggestion would turn the game more realistic, give a utility to the ATC which is a cool but unused feature and incentivate people to join or create airlines to participate these servers


server isn't there anymore