Flow Map - American West Flights

http://www.mynetbizz.com/pages/airlines/america-west-airlines/america-west-airlines.cfm

Flow maps are a mixture of maps and flow charts.  The basis for these maps is just a map depicting land and sea (with political boundaries).  On top of this map an overlay of the flow of such things as people or goods.  These maps can be beneficial for a variety of different purposes, since we live in a world that is heavily influenced by the exchange of goods, people, and ideas.

The above image is a flow map for the airline flights that are performed by American West Flights.  We can see that Phoenix and Las Vegas are the major hubs of flights to other various regions of the U.S due to the clustering of flight lines out of the city. This map was also able to show the international flights that American West performs by merging multiple maps into one.