 David Angell (qv) (who was a writer, story editor, and producer  for Cheers) and his wife were both killed on September 11, 2001,  when the plane that they were on, American Airlines flight 11 from  Boston to Los Angeles, was hijacked and flown into the World Trade  Center in New York City. They were returning home to California  after attending a family wedding in Cape Cod, Massachusetts.