When you said "Green Card" I through you were talking about Green Card
Well, it's not that funny to joke about "spending time in the room' these days when our rank in Amnesty International is pretty close to Myanmar or something..

SEATigger put it really nicely, the jetway would back up anyway. Actually this would create very bad congestion inside the aircraft..

I will be taking ORD-LHR soon, and will see what happens..