Downing Street said the coalition would stick by its commitment that there would not be a third runway.
The coalition parties have made a pledge not to have a third runway and that is a pledge that we will keep. We don't see the argument for a third runway.
David Cameron has been challenged by senior backbencher Tim Yeo to show whether he's a man or a mouse over expansion at Heathrow.
The Coalition will keep its pledge not to build a third runway at Heathrow Airport despite renewed pressure, Downing Street said.