A New York state appeals panel Tuesday upheld the dismissal of a defamation lawsuit brought by a claimed rescuer at the World Trade Center site against NBC’s “Dateline,” three of its editorial employees and three others, including a reporter at the Albuquerque Journal, who were interviewed on the program.

A unanimous opinion, written by Justice Dianne T. Renwick of the Appellate Division, 1st Department dismissed Doug Copp’s claims against “Dateline” host Stone Phillips, reporter John Hockenberry and an editor, finding that Copp’s lawyers had failed to properly notice his appeal against NBC and its employees.