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
Glenn Miller included Marion Hutton, Skip Nelson, Ray Eberle and to a smaller extent, Kay Starr, Ernie Caceres, Dorothy Claire and Jack Lathrop. Pat Friday ghost-sang with the Miller band in their two films, "Sun Valley Serenade" and "Orchestra Wives" with Lynn Bari lip synching. Miller and his band appeared in two Twentieth Century Fox films. In 1941's "Sun Valley Serenade", they were major members of the cast, which also featured comedian Milton Berle, and Dorothy Dandridge with the Nicholas Brothers in the show-stopping song and dance number, Chattanooga Choo Choo. The Miller band returned to Hollywood to film 1942's "Orchestra Wives",