Could I have a go at summing up the possible scenarios for the TRA being implimented thus:
1/ Political;
keeping media out of the way (for usual reasons)
2/ Security;
keeping civvy aircraft away for security related reasons, ie disclosure/fiming of secret stuff.
3/ Physical Security
Banning civvy aircraft for fear of use of AC in attack.
4/ Sound aviation based reasons;
Congested airspace atc workload risk of collision.
5/ No specific reason:
it was just done as it was in someones emergency planning procedure?
Any other categories?
Mickjoebill