.San Francisco International Airport will add its fifth low-cost carrier on the Fourth of July, when Song, the low-fare unit of Delta Air Lines, begins service between SFO and New York's John F. Kennedy International Airport.
The nonstop service, beginning Monday with one flight a day, will increase to five flights a day by autumn, said Tim Mapes, Song's vice president for marketing
Delta's Song to wing from SFO to JFK