Slightly off subject, but in terms of territory, I think I am right in recalling a situation in which Police officers did not board an El Al Flight in Heathrow due to confusion over territory etc to arrest a High Ranking Israeli officer....
I suppose it also had something to do with the El Al security guys on board as well....
Think it took so long, that in the end the plane indeed did return to its homeland. Believe in that case the Police actually did have the right to board that plane.