Originally Posted by fireflybob
Whether or not to tell the passengers surely depends on the context and the likely threat. (No criticism intended of the crew in this case).
As an afterthought, the UK legislation says that a/c can only fly in formation if the commanders of the a/c have agreed to do so. Nothwithstanding the terrorist threat I hope that a/c commanders are being informed that they are being formated on prior to the event!
Thats why they call it being intercepted...you don't have a choice about flying in formation when you get intercepted. That rule only applies when you have 2 or more civil airfcraft who plan to fly in formation for kicks.