This is a scenario I've been running through my head a bit. What if on 9/11 or a 9/11 style attack has happened to another country besides the US. The countries I mean are mostly European countries and major allies of the United States, like the UK and France or Canada. Assume its the same style of attack, using planes to attack high value targets. Also assume in this scenario the attackers think, for some reason, attacking the US is unfeasible so instead they decide to strike one of their closest first world allies.