I certainly have no idea on the formality, I do remember on 9/11 discussion about whether the airforce had shot down flight 93. There was a British "reality tv

I certainly have no idea on the formality, I do remember on 9/11 discussion about whether the airforce had shot down flight 93. There was a British "reality tv" show a few years later where some idiots got to run the country (heh). One scenario had a plane approaching London and refusing to divert to Stansted. The people 'in charge' just ran the clock down, not making the decision to fire, and the plane crashed into westminster, so not a total loss I guess.