Nine climate protesters have been arrested after breaking through a perimeter fence and setting up a barricade on an airport's taxi-way.
Flights to and from Aberdeen Airport were delayed as a result of the security breach by members of the Plane Stupid campaign group, and the protest also held up an air ambulance.
After talks with police, seven of the protesters who were on the taxiway gave themselves up six hours after the demonstration began, and two others who were on the roof of the terminal building were also arrested.
Plane Stupid said the activists broke through the perimeter fence at about 2am on Tuesday in protest against the airport's expansion plans and the resulting increase in greenhouse gas emissions.
The group added that the activists were dressed as golfers in the style of US property tycoon Donald Trump, who is planning to build a major international golf resort in the area and supports the expansion of the airport.
The airport's managing director Kevin Brown said that one of the "key concerns" for staff during the incident had been to ensure the departure of an air ambulance.
Mr Brown said the flight, bound for Inverness, had been held up by the protesters but not for a "significant" length of time.
A spokesman for airport operator BAA said of the protest: "This action is dangerous and highly irresponsible, not least because Aberdeen is one of Europe's busiest commercial heliports and a major transport centre for the north of Scotland, used by tens of thousands of people every day.
"There is no justification for this irresponsible action, which is deliberately calculated to delay and inconvenience the travelling public."
BAA added that out of 350 flights scheduled for Tuesday, 10 had been disrupted.
