There are things like IVAO/VATSIM networks which allow you to communicate with real people playing ATC. Back in the days (like a decade ago) there were also som

There are things like IVAO/VATSIM networks which allow you to communicate with real people playing ATC. Back in the days (like a decade ago) there were also some speech-to-text based addons, which allowed you to do (very basic) things like go through checklist with a copilot, tell them to adjust flaps, put landing gear down etc. Not sure how much they've improved since. But I agree, this is one area where LLM's could have major potential.