@noblues
its firmly JAA ops and everybody controls his on turf. that is how the big system works. you would be amazed how much data your aircraft is sending down during a flight. Just check for example the AF447 accident. Every airline has got an OPS control. Drop by and ask the guys what automated reports they get downlinked via ACARS. I bet change of destination will be one trigger...
As previously mentioned, i would not trust too much the FMS predictions, because of so many unknown variables.