I take it this is all via POI system.
If so I take it for the likes of Glasgow and Edinburgh I'm going to need to place all 3 levels of POI as they do cover stuff from small single props right up to the A380 at Glasgow and sure Edinburgh can handle up to the 747s although rarely does these days if at all.
I was wondering about this. Does placing a large POI allow for the spawning of small and medium stuff as well, or do you need be placing all 3?