Monster weekend winter storm blankets a swath of mid-Atlantic . CNN offers weather waiver on rescheduling fees ; American to add flights . Record snow blanketed some areas winter ; Philadelphia gets 18 inches . At least four deaths have been linked to the winter storm .
Monster weekend winter storm blankets a swath of the East Coast . Delta offers weather waiver on rescheduling fees ; American to add flights . Record snow blanketed some areas Sunday ; Philadelphia gets 23.2 inches . At least four deaths have been linked to the winter storm .