Just thought I would add an update. My husband is at Cancun Airport waiting for his new flight and they made an announcement about the flight to Philadelphia that he was supposed to be on yesterday. Apparently it is still sitting there and they said they can't get it out but last update from AA was maybe 6:00 tonight. A passenger told him that the plane does not have the proper registration that the FAA requires for it to reenter the US. Ever heard of such a thing?