WORLD AIR TRAFFIC 0-24 HRS. VIEW FROM SATELLITE

     http://www.liveleak.com/view?i=b5b_1252857686

One of the interesting things to notice is that the main stream of flights from the US to London begins arriving about the same time as the stream of flights begins from London to the US. That clarifies why there’s such congestion in the mornings at Heathrow.