I meant at any moment.
And the comment about 9/11 will only get this thread removed - so I'll ignore that, apart from saying not everyone is still paranoid from 9/11 and I know many people, especially who have flown with Lufthansa, who have had FD visits.
Anyway, not looking for sarcasm, just simple answers, to which you gave one, and for which I thank you. I think I'll confirm with US Boarder Control, though, just to be sure.
