Heathrow airport has said it can build a third runway for £21 billion within a decade.The airport has submitted plans to the Government for a new full-length runway, but insisted it is open to considering a shorter one.The west London hub is seeking permission to open a new 3,500-metre runway to the north-west of its existing location.

Heathrow airport has said it can build a third runway for £21 billion within a decade.The airport has submitted plans to the Government for a new full-length runway, but insisted it is open to considering a shorter one.The west London hub is seeking permission to open a new 3,500-metre runway to the north-west of its existing location.