New runways at Heathrow and Gatwick are among the options that have been short listed by the Airports Commission, for expanding UK capacity.
The options include a new runway at Gatwick; and adding a third runway, as well as lengthening another, at Heathrow. Other potential options include new runways at Stansted or Birmingham.
A final report is due by summer 2015, where the commission, led by businessman Sir Howard Davis will also consider a new airport in the Isle of Grain, in North Kent.
Supporters of Heathrow's expansion say it will be quicker and cheaper than other options and will help to maintain the UK as an international aviation hub.
Heathrow's owners submitted evidence to the commission, arguing that a new runway could be in place by 2029, allowing 260,000 more flights.
Colin Matthews, Heathrow chief executive said: "The case for Heathrow is strong. It's important that businesses can get around the globe to where economies are growing."
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