I was rebooked from the 0700 BOS-ORD to the 0610 BOS-ORD tomorrow morning, then to the 1700 BOS-ORD when the earlier one cancelled as well. However, the rebook only gave me a 45 min. connection in ORD, and the snow here in BOS is to continue through the early evening, so I figure de-icing might eat up the better part of those 45 min. Called, and they rebooked me on an earler BOS-ORD leg, but you might want to check yours.