A display shows cancelled flights as passengers walk at Frankfurt Airport in Frankfurt am Main, western Germany, on July 27, 2022, after employees of German airline 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)