Ryanair has called on government to be "radical" and approve runways at three airports in the south east.
The company said government should approve new runways at Heathrow, Gatwick and Stansted to resolve the ever-crippling issue of aviation capacity.
The announcement comes as the country awaits government's decision on where to expand capacity, with Heathrow, Gatwick and the Heathrow Hub – an extension of Heathrow's northern runway – in contention.
Stansted is the base for a number of airlines, and is the largest base for Ryanair.
Michael O'Leary, Ryanair chief executive, said: "Ryanair calls on the new UK Government to be radical in its decision making on new runways for London instead of picking just one (Heathrow or Gatwick) and calls on Prime Minister Theresa May to approve three new runways – one each at Heathrow, Gatwick and Stansted, which will finally resolve the runway capacity issue for the next 50 years, while ensuring competition between airports delivers efficient facilities and prevents airlines and passengers being ripped off by gold-plated monopoly runways."
The news comes after it was announced in June that the airport expansion decision had been pushed back until "at least" October.
Business leaders have been pushing for a quick decision since the Davies Commission was published last July, which recommended building a third runway at Heathrow.
The government said in December it would delay making a decision on airport expansion in the south east until at least this summer, saying "more work will be done on environmental impacts" in the interim.
Philip Hammond, the newly-appointed chancellor, has said a decision should be taken soon after Dubai surpassed Heathrow as the world's busiest airport.