Mayor of London Boris Johnson will today attend a cross-party rally against the highly controversial proposal to build a third runway at Heathrow airport.
Organisers say they expect thousands to turn out for the protest in Barnes, west London, to voice their opposition to expansion of the travel hub.
The Mayor has previously accused David Cameron of kicking the matter "into the long grass" by delaying an independent report on the future of aviation until after the next election.
He favours a new "Boris island" airport in the Thames Estuary or possible expansion at Stansted.
Former transport secretary Justine Greening is expected to make her first speech on Heathrow since she was moved to international development in September's Cabinet reshuffle amid speculation that it was due to her stance on the issue.
More top news
A man from north London has been jailed for 27 years for owning guns and conspiring to supply drugs. Two others were also jailed.
One of the country's most extravagant private homes has been snapped up for just a quarter of the original £100 million asking price
Transport for London is being forced to pull down Germanwings tube adverts with the words "get ready to be surprised" after the fatal crash