London's airports are expecting one of their busiest days ever, as they begin the task of repatriating hundreds of thousands of Olympic athletes, coaches, officials and spectators. Heathrow alone expects to handle around 120,000 passengers, 30% above normal levels.
You can watch the increasingly congested skies around south-east England in real time with Plane Finder, a live map that plots the location and route of every commercial jet. Click on any of the aircraft icons to find out the airline, destination, height and other nerdish facts.
At time of writing it's relatively quiet, but we're expecting to see the airspace get busier as the day progresses.
Plane-spotting types out there might also be interested to download the mobile version.