Lufthansa staff are planning wide-ranging warning strikes in Germany for 22 April after the carrier failed to reach an agreement with the service industry union Verdi.
Strikes throughout the day are planned at the airline's hubs in Frankfurt and Munich as well as Dusseldorf, Cologne, Hamburg, Hannover and Stuttgart.
The airports of Berlin and Nuremberg will also be affected, though industrial action should be finished in the capital by 14:30 and it will only take place in Nuremberg in the morning.
Verdi wants to increase wages by 5.2% and achieve job security commitments for about 33,000 employees across the mainline carrier, MRO arm Lufthansa Technik, catering operation LSG, and IT subsidiary Lufthansa Systems.
But the union says the airline group has thus far offered only salary increases of between 0.4% and 0.6%, which would amount to a wage cut in real terms.