David Angell, a creator and executive producer of the NBC series ''Frasier,'' died on Tuesday on American Airlines Flight 11 from Boston. He was 54 and lived in Pasadena, Calif.

Mr. Angell was returning with his wife, Lynn, 52, to California from their summer home in Chatham, Mass., NBC reported. Flight 11 was hijacked and flown into the north tower of the World Trade Center in Manhattan at about 8:45 a.m.

Kevin Scully, a family friend and funeral director, said the family had received confirmation of the death from the airline.

Along with Peter Casey and David Lee, Mr. Angell was a creator and executive producer of ''Frasier,'' starring Kelsey Grammer, and had written for the show. Produced in association with Paramount Network Television for NBC, ''Frasier'' has won 24 Emmy Awards since its creation in 1993, including 5 wins for outstanding comedy series.