Last month, the government asked for further information to help choose between the Heathrow and Arora schemes.
The Department for Transport said Heathrow’s own proposal offered the most deliverable option, and the “greatest likelihood” of getting a decision on planning approval within this parliament.
The plan that has been backed will inform the government’s review of the Airports National Policy Statement.
Once that is complete, Heathrow is expected to apply for planning permission. The government then hopes for a decision by 2029.
But any company will be able to submit an application to build the new runway and terminals at the site.
Transport Secretary Heidi Alexander said Heathrow was the UK’s only hub airport that supports trade, tourism and jobs.
“Today is another important step to enable a third runway and build on these benefits, setting the direction for the remainder of our work to get the policy framework in place for airport expansion,” she said.
“This will allow a decision on a third runway plan this parliament which meets our key tests including on the environment and economic growth.”
The government has already approved a string of other airport expansion plans, including a second runway at Gatwick Airport.
However, the Heathrow plans face opposition from environmental groups, politicians, and local residents.
