fuzzy it really does depend who it is.
They don't create SID's and STAR's though.
The access to the airspace is very very dependent on who's in the aircraft requiring class A and who is actually controlling at the time and if there is radar or not.
In my limited exerence which is a few years old now.
Any thing to do with American's and the whole lot gets locked down, men in black turn up in the tower and its very restricted even if you are IFR. You have no chance getting a sly SVFR clearance or taking a IFR clearance in the air. At my local field we used to get certain high ranking yanks coming to play golf.
Now Royal flights I won't go into details but they are alot more civilised and sensible in the application of class A and there is minimal fuss for all concerned. If you are on the apron near where the aircraft will park someone will come and have a chat and be very pleasant. If they ask you to do something, you will have no doudt that you will do as your told but they way they do it you really couldn't get annoyed. They are that slick as well any restrictions are done and dusted within 10 mins of the aircraft arriving. Where as a yank turning up can be a ball ache for 40 mins plus.