Ah my bad, I think you are right, Mixxer. I thought the issue was spawning aircraft taking off on the runway in front of you. Ie takeoff spawns. But you are talking about general air.spawns. If the unwanted spawns are enemy air spawns near your airbase, you can add Flags="enemy" to the first waypoint line in the spawn xml file. In stock enemy air spawns triggered by the air.spawns file, they tend to add that Flag. But others (including me) have a sneaky habit of removing the flag from some enemy spawns just to keep you on your toes.....