It didn't seem to be very well publicised, Perhaps it would have been wise to have put the word out so as to alleviate the concerns of the many people who 'witnessed' an airliner being escorted by fighters and naturally thought that something was seriously wrong, rather than the reality of a flypast for a visiting head of state. Also, for those of us afflicted with the curse of the spotter it would've been nice for a heads up ;-)