A sign for Lufthansa First Class and Business Class is seen as passengers wait and queue in front of counters for departure 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)