Megacities

London (1x1)

Air date: Sep 18, 2005

How do the world's major cities keep functioning? While planes usually require a two-minute gap between departures, at Heathrow, the world's busiest airspace, this margin has been reduced to 45 seconds. Watch how air traffic controllers manage this unique and highly regimented flight pattern. Also see how traffic on the streets and on the Thames is regulated.