Can be improved.

Need to have weight of more than 6 aircraft in area, something along lines to choose the number of aircraft online, like 8, 9, 10 or more. Holding pattern is excellent suggestion in such case. Advise pilots for rate of descent/climb. Release pilots to twr/atc frequency. Add FL coordination with departing aircraft. And finally add more airports :) or advise how can I make my own to add it up :) thank you :)

Nick_app_guru about APP Control, v2.3