LONDON -- Air traffic control company NATS handles 2 million flights in UK airspace every year, with 1.2 million of those arriving at or departing from one of the five main London airports.
That makes more than 3,000 flights daily on just six runways.
When those flight plans are turned into colourful trails, they merge into a mesmerising visualisation of aviation over a 24-hour period.
That third runway at Heathrow is looking unlikely.