The environmental activist group Last Generation started protest actions at several German airports on Thursday, forcing suspension of flights in at least one, the group and police said. Two activists in orange high-visibility waistcoats each entered the airports in Berlin-Brandenburg, Stuttgart, Nuremberg, Cologne-Bonn, the organization said. Dpa photographers on site confirmed this. They did not enter the runways, the group said Flight operations in Nuremberg were suspected until further notice, a police spokeswoman said. The activists peacefully expressed their resistance by displaying bann…