Lufthansa almost stopped air traffic on Wednesday in Munich and Frankfurt because of the warning strike by its ground staff.
"Lufthansa has had to cancel almost the entire flight program at the hubs in Frankfurt and Munich for Wednesday," the airline announced on Tuesday.
The warning strike announced by the Verdi union in the collective bargaining conflict has massive effects during the peak travel season.
Lufthansa is canceling a total of 678 flights at Frankfurt Airport, 32 of them on Tuesday.
At the hub in Munich there were a total of 345 flights on both days.
"The early escalation after just two days of negotiations in what has so far been a constructive round of collective bargaining is causing enormous damage," said Lufthansa Chief Human Resources Officer Michael Niggemann.
Individual flight cancellations and delays are still possible on Thursday and Friday.
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