No. I guess the simplest analogy to use is the difference between an airport control service where there's a tower and an airport advisory service, which is either a flight service station on site or a remote advisory service. It would be similar to an intersection that has traffic lights and one that simply has stop signs--the traffic lights being the control service where there is no discretion for drivers, if it's red you come to a stop and so on, and an intersection where there are traffic signs where it's left to the discretion of the drivers to know when to proceed through an intersection. That's the case throughout the world. It has worked extremely well in aviation. In essence it is a volume-driven decision one would make as to when you need to go from one service to another, as I'm sure it is in road traffic.
On March 3rd, 2009. See this statement in context.