This is a map that shows all of the destinations where Southwest Airlines flies planes within the United States. I found this map at the URL http://www.southwest.com/html/cs/travel_center/routemap.html. Based on this map, one can tell that Southwest sends airplanes to approximately 80% of the states in the nation. This map also shows which airports are used to access destinations where Southwest does not specifically fly, as exemplified by the notation of "Miami" underneath the Ft. Lauderdale airport location.   Also, since certain large airports are also generally referred to by the airport name rather than their specific location, such as Love Field (the Dallas airport) and Midway (the Chicago airport), Southwest included both names on the map near specified locations. I find it interesting that Southwest Airlines flies across a majority of the United States, yet ignores six states in a sole region, the northern Midwest, including Montana, Wyoming, North Dakota, South Dakota, Kansas, and Iowa.