Seen from space, earth looks like a bee hive of activity. This video displays a satellite's view of air traffic flying around the world in a 24 hour period - the yellow dots are airplanes.??
Daylight moves from the east to the west as the Earth spins on its axis. You will see the flow of air traffic leaving North America and travelling through the night to arrive in the UK in the morning. ?
Then the flow changes as planes leave the UK in the morning to fly to America during daylight. The day commences in Australia.