I just found out that my flight from ORD was cancelled and I have been rebooked on the last flight that American has leaving 70 minutes after I land from England in T5 (my original flight has a nice 2 1/2 hour cusion between flights). 70 minutes seems awfully close for me to clear customs, and transfer terminals. this will all happen on a saturday. do i need to be worried? if I miss my flight, will I be forced to spend the night at the airport?