Well, at what airport have you ever seen the aircraft spawn onto the runway? The problem of collisions between friendlies could be controled by removing the spawing points on the runways and only allow the aircraft to spawn at the hangers. A small airfield has three Fighter hangers and two bomber hangers. Spawning could be changed so that only one aircraft at a time would spawn and the next aircraft could not spawn in that hanger, until the first aircraft had cleared the hanger. The aircraft would then have to taxi to the end of the runway to takeoff. Just as they did during WWII.