A video simulation of worldwide air traffic over 24 hours has been making the rounds. The YouTube version leaves something to be desired, though. I think I’ve tracked down the original.
The site is Swiss; here’s Google’s translation of the relevant text:
The AirTraffic team presents the global air traffic (simulation over 24 hours). You have 2 file formats to choose from:
This animation was created in collaboration with the Technorama in Winterthur.