The government will make a decision on airport expansion by the end of the year, David Cameron has said.
The PM was speaking after the Airports Commission recommended a third runway at Heathrow as its chosen solution.
Several high-profile Conservatives are opposed to Heathrow expansion, including London mayor Boris Johnson, who predicted it "won't happen".
Labour said it favoured a new Heathrow runway and claimed Mr Cameron was being "bullied by Boris".
In its final report, the commission, set up under the previous coalition government, said it would add £147bn to the economy and 70,000 jobs by 2050.
