Whipping Boy's SATCO - Forgive me if I have misunderstood but you seem to be suggesting that if a CONTROLLER (my emphasis) is too busy then a transit through CAS may be denied. Surely the basic premise is that ALL a/c have a right to enter provided the airspace can accomodate them safely and no conflicts will result (i.e. equal access). The fact that a CONTROLLER is too busy does seem to be an invalid reason. Please be assured this is no way "getting at" controllers for whom I have the utmost respect, more a comment on the system. CAS is NOT there for the exclusive use of CAT and lack of controllers must be addressed. Am I right please?