Not only the world's busiest international airport with more than 62 million passengers each year, Heathrow is also the world's second busiest cargo port. Located south of London, a little more than half an hour away from Picadilly Circus using the underground. The airport is regarded as the hub of the aviation world, and more than 90 airlines have their base here.
Heathrow is operated by the BAA and has 4 active terminals and 2 runways.
The airport itself is dull, but functional. For a budget traveler it is possible to get a nights sleep waiting for a red eye flight, the terminals all have cafés open all night and the proximity to London makes it easy to visit the city in a quick stop-over.