The UFO union of the flight attendants declined to say when it was planning the next labor action over its demands for a 5 percent pay rise and guarantees that Lufthansa will not outsource jobs and use more temporary workers.
UFO warned this week that industrial action could continue for a long time and widen into nationwide stoppages if Lufthansa does not meet its demands.
The strike on Friday, the first in the current round of negotiations, disrupted hundreds of flights and stranded thousands of passengers. A spokesman for Lufthansa, Germany's largest airline, said it would take some time to calculate the exact damage from the stoppages.
(Reporting by Peter Dinkloh; Editing by Mark Potter)
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