Swift Aire Lines was a U.S. commuter air carrier that was based in San Luis Obispo, California. The airline's two letter code was "WI". Swift Aire provided scheduled passenger air service wholly within California from the late 1960s until 1981 when it merged with Golden Gate Airlines. Shortly thereafter, Golden Gate experienced financial challenges and ceased all operations. A book on the history of Swift Aire Lines was written in 1979 by an authority on commuter airlines, Dr. Imre E. Quastler of San Diego State University.