David Cameron has promised a decision on airport expansion by the end of the year.
It follows the publication of the Airports Commission’s final report which recommended a third runway at Heathrow.
Yesterday, leading Tories Boris Johnson and Zac Goldsmith dismissed the Commission's decision, both claiming a new third runway "is not going to happen".
Goldsmith, who is MP for Richmond Park, said: "I don't think anyone believes Heathrow expansion is possible or deliverable politically. There are conditions in this report on air quality and noise pollution that are irreconcilable with Heathrow expansion."
Labour said it is in favour of a third runway at LHR, with acting leader Harriet Harman asking of the PM: "Will he stand up for Britain's interests or will he just be bullied by Boris?"