Piece of Alaska Airlines plane detaches mid-flight, prompting emergency landing; First winter storm of new year moves through Northeast; U.S. official: Pentagon waited days to inform W.H. officials of defense secretary's hospitalization; and more on tonight's broadcast.

Part of Alaska Airlines plane that blew out mid-flight found; Biden has ‘complete confidence' in Defense Secretary despite secret hospitalization; GOP candidates targeting Trump as Iowa caucuses near; and more on tonight's broadcast.