Mouseover to see flights originating at the specified airport. The cool thing about this technique is that the interaction requires zero JavaScript — it’s all done in CSS using the :hover state to toggle visibility of an airport’s associated outgoing flight routes.
The Voronoi tessellation shows the closest point on the plane for a given set of points. This example updates the Voronoi diagram in response to mouse interaction! Colors by Cynthia Brewer; algorithm by Steven Fortune; implementation based on work by Nicolas Garcia Belmonte; interaction inspired by Raymond Hill.