The five London airports see around 1.2 million arrivals and departures every single year. That is a fair chunk of air travel. You would think with those numbers there were a high number of air traffic delays, but 99.8 percent of those flights don’t experience those delays – impressive.
National Air Traffic Services (NATS) has put together this nice animation showing the flow of traffic every day. That’s over 3,000 flights with six runways.