Collective action by a German cabin crew association disturbed Eurowings, Germanwings, Lufthansa CityLine and SunExpress flights on Sunday. The strike was initially set between 5 and 11am but is now expected to last until midnight German time (22:00 UTC), as the cabin crew UFO compartment decided to extend it at short notice.
Walkout affects flights operated by subsidiaries of Germany's Lufthansa flagship, but not Lufthansa itself.
Airports all over Germany have reported cancellations. But while UFO representatives described the walkout as "very successful" and said that more than 100 flights had been canceled, Lufthansa's subsidiaries said only individual flights had been canceled or delayed by the strike.
A strike by UFO union members has caused major delays and cancellations at airports in western Germany
At least 15 flights from German transport company Eurowings were canceled at Berlin's airports , according to a spokeswoman.
Munich Airport reported ten cancellations on Sunday morning.
"The affected airlines are content with all the unorganized staff [in the union]; we have to wait and see what the day gives," a spokesman for Munich Airport warned.
A spokesman for Düsseldorf Airport, where four connections had been canceled, also predicted more cancellations during the day. The airport reports that 60 flights are in danger.
Read more: Left Party leaders demand nationalization of German airlines
Ongoing dispute  Lufthansa has called the strike illegal. The company also claims that the union's new leader, who took office earlier this year, was not properly elected and therefore unable to legally represent staff.
UFO organized the passenger over workers' wages, corporate pensions and part-time work regulations. It is looking for a 2% salary increase for its cabin crew, after it received a 2% salary increase for cabin crew at Lufthansa.
kmm / tj (dpa / Reuters)
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