Before any aircraft are added, I'd like to see the effects of weather. This would add to the realism.
Cold weather: icing the carbs, freezing up the flaps, the skin of the plane becoming more fragile as outside temp drops...ect...ect.
Warm weather: increasing your take-off distance (with thought given to wind direction and speed), changing the best-rate-of-climb speed for an aircraft, pilot behavior after a pilot wound...ect...ect.
Rain, sleet, snow, hail
And what about weapon performance and visibility?
One radio channel could be used for weather briefings.
Just a thought.