After 38 years of service , Southwest Airlines continues to differentiate itself from other low fare carriers--offering a reliable product with exemplary Customer Service . Southwest Airlines is the most productive airline in the sky and offers Customers a comfortable traveling experience . Southwest recently updated its gate areas and improved its boarding procedure to make flying Southwest convenient and simple . Southwest Airlines ( NYSE : LUV ) , the nation 's largest carrier in terms of domestic passengers enplaned , currently serves 67 cities in 34 states ( Southwest will add a 68th city , Milwaukee , Nov .