Environmental protesters have been causing chaos at terminals and buying up land to try and stop the expansion of London's Heathrow Airport.
On Monday, about 250 people dressed up in the sort of clothes people wore in the 1900s gathered at the airport.
They sat and ate cakes and sandwiches at Terminal 1, while a smaller protest was held at Manchester airport.
And a group from Greenpeace, which includes some celebs, has bought up land needed to make the airport bigger.
Comedian Alistair McGowan by the plot of land
The group includes actress Emma Thompson, who plays Professor Trelawney in the Harry Potter films, and comedian Alistair McGowan.
However, the demonstration at Heathrow on Monday was organised by the group Climate Rush and supported by another called Airport.
The Greenpeace group which has bought the land the size of the football pitch has written "our climate - our land" on the plot.
The government is due to decide whether to give the go-head to the expansion this week, but the campaigners say they won't sell the land.
A protest was held at Manchester airport on Monday
Emma Thompson said: "We'll stop this from happening even if we have to move in and plant vegetables."
Campaigners say if a third runway was built at the airport, the increase in flights would be really bad for the environment.
But people in favour of the expansion say it would create lots of jobs, and be really good for Britain's economy.