Cabin crew at four Lufthansa subsidiary airlines staged a day-long strike Sunday, causing dozens of cancellations at German airports in a battle for better pay and conditions.
The walkout, called by the UFO cabin crew union, was initially set to last from 5:00 am until 11:00 am (0300-0900 GMT) but a worsening spat with Lufthansa bosses prompted the union to extend the strike until midnight.
The industrial action at Eurowings, Germanwings, SunExpress and Lufthansa CityLine led to over 100 flight cancellations, mainly hitting short-haul journeys at Hamburg airport, Munich, Berlin-Tegel, Cologne and Stuttgart, according to DPA news agency.
Frankfurt airport, the country's busiest, reported "only a few" cancellations, affecting CityLine flights.
In a statement, UFO said it had ramped up the strike after the Lufthansa group told employees the walkouts were "illegal" and "endanger your jobs".
"This is not only wrong, it also signals the next level in the threats against cabin crew colleagues," UFO said.
"This behaviour must be stopped." But the Lufthansa group downplayed the impact of the strike, with a spokesman telling DPA that "more than 90 per cent of the crew members showed up on time for their shift".
The union had previously called off plans for Lufthansa workers to join Sunday's warning strike after the company offered a surprise two-percent pay hike to flight attendants at the flagship airline.
But other demands for better conditions have yet to be met and UFO has not ruled out further action, with fresh talks at all five airlines scheduled for Monday.
Bosses at the Lufthansa group believe UFO may no longer have the legal right to speak for workers and have challenged its status in court.
Internal disputes at the union have cost it members and support among cabin crew, some of whom have now turned to other representative organisations.
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