Flow Map

 

http://aerosociety.com/News/Insight-Blog/1644/ATM-a-vision-of-the-future

This is an example of a flow map of the world's future aviation path.  Each line on the image above indicates a route that the airplane will travel to reach its destination.  The color red in the map symbolizes that there is multiple routes in that area and are more frequently traveled compared to the yellow lines.  As globalization grows more flight paths will be created.