The first video below is a simulation of the entire world's air traffic over 24 hours. No surprise that South America and Africa are fairly blank, with the USA and Asia pulsating with traffic.

Keep an eye out for how the traffic flows between North America, Asia and Europe as overnight flights hit the virtual highways of the skies.

The second video is a similar simulation for Europe. It also zooms down to ground level so you can see how flights bounce around on short hops across the continent.