Activists from Just Stop Oil have blocked the security screening zone at Heathrow in another protest.
A group of demonstrators sat or stood holding signs saying "Oil kills" and "Sign the treaty" in front of the barriers to enter the area for departing passengers.
Members of the protest were dragged away by police officers after another attempt to unleash a "summer of chaos" at airports across Europe.
It comes after a protest on Tuesday that saw two Just Stop Oil activists arrested after they sprayed orange paint on departure boards at Heathrow's Terminal Five.
Protesters held up the signs at Terminal Five
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Just Stop Oil protestors block the departure gates at Heathrow
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Just Stop Oil protestors block the departure gates at Heathrow Terminal 5
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It does not appear that there was any impact on any of the flights.
“Earlier this morning a protest incident in Terminal 5 was swiftly resolved and all involved were immediately removed from the airport. Unlawful and irresponsible protest activity is not the way forward and will not be tolerated."Our priority will always be to maintain the safety of passengers and colleagues, and we'll continue to work closely with our partners and the police in taking proportionate action to protect travel plans this summer.”
Passengers move to a different departure gate as Just Stop Oil protestors block the departure gates at Heathrow Terminal 5
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One of those protesting today said "Cimate breakdown is endangering all we love. Starvation already threatens those who have done the least to cause this mess. Billions will be on the move as they try to find land they can cultivate, water to drink- any safe place.”
“Electric cars and windfarms won’t do it: governments must act together before we reach more tipping points into chaos than we can prevent. We need our political leaders to act now, by working with other nations to establish a legally binding treaty to stop the extraction and burning of oil, gas and coal by 2030.”
It comes after a JustStopOil activist who threw soup at a Vincent van Gogh painting has been arrested again after spraying paint on departure boards at Heathrow Airport.
Phoebe Plummer, 22, was one of two women involved in a protest at the west London airport on Tuesday morning. They sprayed orange paint from large cylinders on departure boards, floors and glass walls inside Terminal 5.
The Metropolitan Police said the pair were arrested on suspicion of criminal damage.
A video issued by Just Stop Oil shows the women carry out the protest near check-in desks for at least three minutes and 55 seconds without being approached by police officers or airport staff.