Marks !

There is available a preview of the Marks/Points feature at http://www.tsavo.com.ar/mapflying/ (if you select a circle, you will see the information related to that point—airports- on the right panel. Only 3 Airports shows its related fights to other airports (for instance : Las Vegas Airport).
This is just an example about the Mark Layer. All that points were configured on a XML file (but you can customize it to take them from a PHP/Java service instead of an XML).