This is an animation showing all the commercial flights taking place on earth over a 24-hour period.

It's 72 seconds long (quite boring) but if you grab the tab and move it you can see how the concentration of flights changes with the movement of the sun across the earth's surface.

Geeky, I know, but fun.

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This video was also featured in Wired, with several extra ones added.

Including one detailed one about Europe.

 

Wired article

Flight map