"...a 24-hour observation of all of the large aircraft flights in the world (recorded by the airplane flight transponders via Geo-stationary orbital satellites) patched together and condensed to about a minute. ...You can see it is summer in the north by the location of sunlight on the planet."

As the terminator brings daylight to the U.S., flights increase and the direction of traffic to Europe reverses.

Because the video is so short, I've watched it several times, focusing on a different area of the planet each time.