Back in mid-August, from Spiegel:

“Airplanes were unable to take off at several airports on Monday - climate activists from Extinction Rebellion wanted to attach themselves to planes with superglue or get out before take-off. They were verbally harassed by passengers.
“Activists of the climate protection movement Extinction Rebellion protested against domestic air traffic at several airports on Monday. The actions in Munich, Lübeck, Berlin and Düsseldorf were intended to draw attention to the fact that short-haul flights make a "significant contribution" to Germany's "harmful CO2 footprint", the alliance said. According to the Lübeck police headquarters, 18 people were taken into custody there until Monday morning.”

In Lübeck:

“Another 15 people were able to get through the fence at another location and were taken into custody by police forces on the apron. Three of them tried to fix themselves with superglue, the police explained. This could also have been "prevented in time“.
“Three activists reportedly had tickets for a flight to Munich. One passenger had tried to fix himself to the plane to Munich with superglue, the officials further announced. This could be prevented by a passenger as well as the police officers present and the airport security service.”

Superglue.

Dedication? Yes. Ouch? Yeeeeeeeeees.