Is it the one that was came from the UK and was diverted from Dulles to Boston or something like that because the name came up on the watch list?

I have FoxNews in the background and all they said was a news alert: a plane from the UK has been re-directed because a name of a passenger matches someone on the watch list. Nothing about Cat Stevens, or whatever he calls himself these days.

The scariest thing is this - why the hell didn't they check the passenger list/watchlist BEFORE the plane left the ground?