I think it depends on how the original developer place those static planes. If they still made the parking slots available and slap a static object on top of it. Why not remove the parking slots from the airport AFCAD itself through the SDK? Without the parking slots, air traffic or ground aircraft won’t spawn on them, causing clipping issues with the static objects.
If the developer already removed the parking slots from being available in the first place, then there shouldn’t be any issue because without the parking slots, they won’t spawn on them anyway. And static aircraft would just form as part of the airport itself.