North American Numbering Plan usually shown in capital letters, were dialed. Later, the third letter, where implemented, was replaced by a digit, or an extra digit was added. This generally happened after World War II, although New York City converted in 1930. The adoption of seven-digit local numbers (2L-5N) was chosen as the requirement for direct distance dialing and progressively deployed starting the late 1940s. The famous Glenn Miller tune "PEnnsylvania 6-5000" refers to telephone number PE6-5000, a number still in service at the Hotel Pennsylvania (212 736-5000) in New York. Similarly, the classic film "BUtterfield 8" is set in the East Side of
Pure Gold (Glenn Miller album) "Pennsylvania Six-Five Thousand": Saxes: Hal McIntyre, Tex Beneke, Wilbur Schwartz, Ernie Caceres, Al Klink; Trumpets: John Best, R. D. McMickle, Clyde Hurley, Legh Knowles; Trombones: Glenn Miller, Jimmy Priddy, Paul Tanner, Frank D'Annolfo; Piano: Chummy MacGregor; String Bass: Herman "Trigger" Alpert; Guitar: Jack Lathrop; Drums: Moe Purtill. The personnel on the May 7, 1941 recording of "Chattanooga Choo Choo" by Glenn Miller and his Orchestra in Hollywood on RCA Bluebird were Paula Kelly, the Modernaires (vocals), Billy May, John Best, Ray Anthony, R.D. McMickle (trumpet), Glenn Miller, Jim Priddy, Paul Tanner, Frank D'Annolfo (trombone), Hal McIntyre, Wilbur Schwartz (clarinet, alto