Conservative MP Zac Goldsmith said he would not stand as a Conservative party candidate if David Cameron regaled on his "No ifs, no buts" earlier position on building another runway. Speaking to ITV News he said:
"If we go into the next election with a green light for Heathrow expansion, I would not able to stand as a Conservative."
Some believe today's report did not draw firm conclusions in order to avoid a politically divisive issue before the next election.
Expansion of Heathrow and Gatwick Airports are the shortlisted options being considered by a government report into airport expansion.
Heathrow is the third busiest airport in the world in terms of passenger numbers. It carried more than 69 million people in 2011.