From the Guardian:
The Government has laid out proposals for a major expansion at Heathrow which could see a third runway and a sixth terminal built at the west London airport.
The new runway to the north of the airport would be longer than originally envisaged and could be in operation by 2020. Until then, changing arrangements to allow take-offs and landings from the same runway would increase capacity at Heathrow.
A third runway, to be 2,200m long, could be built while meeting noise and air quality targets, the Government said. The number of take-offs and landings a year would rise from 480,000 now to 702,000 by 2030.