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Senior ministers will collect in Downing Street this morning to approve what quantities to stipulate planning permission for a third runway at Heathrow Airport.
The financial sub-committee, chaired by Theresa May, is anticipated to log out the enlargement plan, after which ship it for approval by the total cupboard.
If backed, MPs would then be requested to vote on the problem within the coming weeks.
The authorities has backed enlargement in precept regardless of opposition from key figures akin to Boris Johnson.
If the plan is backed by the cupboard, Transport Secretary Chris Grayling may come ahead with the assertion later this week, probably instantly, the BBC's Political Editor Laura Kuenssberg stated.
It needs to be voted upon no later than 21 sitting days after its publication.
Ministers have accepted the suggestions of a 2015 evaluation into airport capability within the south-east of England.
This concluded that constructing a third runway at Heathrow provided the best financial advantagesso long as it was accompanied by a bundle of measures to handle its environmental and group impacts.
A draft nationwide airports assertion was permitted by ministers in October setting out the situations for its approval.
Parliament should approve the revised assertion, which has since been topic to a public session, to permit the planning course of to maneuver onto detailed work.
Foreign Secretary Mr Johnson, who's MP for Uxbridge and Hillingdon in west London, has lengthy been against Heathrow enlargement on each financial and environmental grounds and has vowed to "lie down in front of bulldozers" to stop it.
Other critics embody former schooling secretary Justine Greening, who additionally represents a London constituency, and shadow chancellor John McDonnell.
Analysis by Laura Kuenssberg
Yes, the decades-long debate about airports in Britain is returning (it is by no means gone for lengthy) simply at a time when the federal government is embroiled in rows it is going to battle to win. As one cupboard minister joked, "it's the gift that keeps on giving".
However, with solely Boris Johnson having huge doubts across the cupboard desk, the true rumpus shall be within the Parliamentary Tory Party.
Plenty of Tory MPs have lengthy held objections to Heathrow and they are going to be made loudly on the backbenches within the weeks to return. The authorities does not have a majority and keep in mind, it needs to get this plan by the Commons by the tip of the month.
If they will, it will likely be a demonstration of "look, we are getting on with things, it's not just Brexit!"
There shall be howls, and the method even after this doubtless vote is a very lengthy one. But the federal government can anticipate to get the vote by. Even if Labour opposes it, which it could nicely do on environmental grounds, the party can also be break up on the deserves of the mission so won't all vote collectively.
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Labour has stated expanded capability is significant to the UK financial system however its help is conditional on assessments being met on capability, local weather change, noise and air high quality in addition to the broader financial advantages.
Heathrow's house owners say a new runway would price £14bn and improve its capability from 85.5 million to 130 million passengers. It is hoped it could be operational between 2025 and 2030.
Campaigners argue a new runway will breach the UK's authorized limits on air air pollution however final yr they failed in a bid to have the decision declared illegal.