Climate-change protesters have descended on London City Airport on Thursday with one even being escorted off a Dublin Airport bound flight just as it was about to take off.
The extinction rebellion protesters have been gluing themselves to the terminal building and dancing on a roof but have ultimately failed to cancel any flights.
One protester went as far as to buy a plane ticket in order to disrupt operations on the runway.
The person in question stood up and gave a speech on climate change as a flight from London to Ireland's capital was about to take off, according to a BBC journalist who was on the plane.
The plane had been grounded by a protester on board, who stood up to deliver a lecture on climate change just as the plane was due to take off.
The man refused to sit down and takeoff was delayed while the plane taxied back to the gate, where he was escorted from the aircraft, the journalist said on Twitter.
In a statement to Dublin Live, a spokeswoman for Aer Lingus confirmed "that a passenger scheduled to travel on EI283 flight from London City to Dublin airport was removed from the flight due to disruptive behaviour on board".
She added: "The safety and security of our guests and crew is our number one priority and as a result, a full security check of the aircraft was completed prior to the flight departing.
"The flight departed at 11.16am and is scheduled to arrive in Dublin at 12.37pm. We apologise for any inconvenience caused."
Protest organisers Extinction Rebellion have vowed to occupy London City Airport's terminal and shut down operations for three days as part of its action in the British capital.
The airport said it is "committed to building a more sustainable future for the airport and the aviation industry" and has said it will achieve net zero carbon emissions by 2050.
London City is the capital's fifth-biggest - and most central - airport, popular with business travellers, bankers and politicians for short-haul and regional routes.
On Thursday, 18,000 passengers are due to arrive or depart from the airport, with 286 flights scheduled. While some protesters got inside the terminal building, flights were continuing, though some were delayed.
Extinction Rebellion said protesters would lie, sit or glue themselves to "nonviolently use their bodies to close the airport."
One went further, climbing over barbed wire to dance on the roof of the airport entrance as a live band played clarinet music below.
