Aircraft of German airline Lufthansa are seen parked at the tarmac of Frankfurt Airport in Frankfurt am Main, western Germany, on July 27, 2022, after employees of Lufthansa were called to strike. - German national carrier Lufthansa said on July 26 it would have to cancel almost all flights at its domestic hubs in Frankfurt and Munich because of a planned strike by ground crew, adding to a summer of travel chaos across Europe. (Photo by Daniel ROLAND / AFP)