Labour is divided over plans for a third runway at Heathrow as Chancellor Rachel Reeves prepares to take on Environment Secretary Ed Miliband and London mayor Sadiq Khan.
Ms Reeves is expected to use a speech on growth next week to support the proposed third runway at the west London airport and endorse expansion at Gatwick and Luton Airports, according to news agency Bloomberg News.
But Mr Miliband and Mr Khan are reported to be against the plan.
It was also said that backbench Labour MPs oppose the expansions and see it as an attempt to grow the economy at the expense of climate commitments.
Keir Starmer voted against a third runway in 2018 but appears now to back the idea.
Opponents of airport expansion claim boosting flights would be damaging for the environment.
Alethea Warrington, head of aviation at climate charity Possible, said: “Approving airport expansions would be a catastrophic misstep for a Government which claims to be a climate leader.
“This huge increase in emissions won’t help our economy, and would just encourage the small group of frequent flyers who take most of the flights, further worsening the UK’s huge tourism deficit.”
She added that the Government should focus on supporting “affordable and low-carbon trains and buses”.
Jenny Bates, transport campaigner at Friends of the Earth, said: “A decision to green-light another runway at Heathrow would be hugely irresponsible in the midst of a climate emergency and given 2024 was the first year to surpass the all-important 1.5 degrees threshold.
“It would also fly in the face of the Prime Minister’s promise to show international leadership on climate change.”
She added that airport expansions would “bring worse air pollution and noise disturbance for local people”.
Heathrow’s third runway project secured parliamentary approval in June 2018 but has been delayed by legal challenges over the environmental impact, and the coronavirus pandemic.
There is currently no Development Consent Order application for the scheme, and it is up to Heathrow if it submits one.
Transport Secretary Heidi Alexander has a deadline of February 27 to make a decision on whether to allow Gatwick to bring its existing emergency northern runway into routine use.
She has a deadline of April 3 to decide on Luton Airport’s bid to raise its cap on passenger numbers.
A Government spokesman said: “We are determined to get our economy moving and secure the long-term future of the UK’s aviation sector.
“All expansion proposals must demonstrate they contribute to economic growth, which is central to our Plan for Change, while remaining in line with existing environmental obligations.”
There is also speculation that Ms Reeves will support the Lower Thames Crossing – a proposed new road crossing between Kent and Essex – and a Universal Studios theme park in Bedford.
