Climate change activists have arrived at London City airport in a bid to disrupt flights for three days.
More than 90 flights arrived or departed earlier this morning before the Extinction Rebellion (XR) protestors reached the Docklands airport.
Boarding pass checks were being made at the entrance to the terminal due to the threat of protestor activity.
The airport is also working with the Metropolitan Police in an effort to minimise disruption.
The protest organisers have said state that if are prevented from getting into the airport itself, they will form a blockade from the outside, occupying both the Docklands Light Railway station and access road.
An airport spokesperson said: “We can confirm that a number of protesters have arrived at London City Airport.
“We continue to work closely with the Metropolitan Police to ensure the safe operation of the airport, which remains fully open and operational.
“As of 9.15am there have been over 60 flights which have either arrived or departed.
“If you are flying from London City today, please check the status of your flight with your airline before travelling to the airport.”
XR spokesman Rupert Read said: “London City airport is planning to roughly double its numbers of flights. It is located in a highly built up area meaning that its flights cause a lot of noise-misery as well, of course, as climate-deadly pollution.
“By non-violently shutting down this airport, in homage to the style of the Hong Kong democracy protesters, we are demonstrating the utter frailty of the transport systems that countries such as ours, unwisely, have come to depend upon.”