FLOW MAP

http://www.spatialdatamining.org/software/flowmap
Flow maps are a mixture between flow charts and a map. It shows the movement of an object or objects from one location to another location. The lines on the map represent the moving, flowing, or migrating objects. This map represent the major airports in the United States and their connecting airports. Areas on the map where may lines come from one point, show the highly used airports by people.