Workers walked off the job at 6:15 am, a UFO trade union spokesperson said, adding that the cabin crew for Germany’s biggest airline will begin work again around 9:15 am.

The trade union is fighting to get workers a salary increase of 15 percent in the next year and better working conditions. Lufthansa, which employs some 16,000 cabin crew members, has offered a deal that includes a 10 percent salary increase that would occur over the next 14 months. Talks between the union and Lufthansa broke up last Friday without agreement.

As the strike drew to an end, Lufthansa reported 17 flights had been cancelled, but said the airline expected the flight plan to return to normal by 10 am. A spokesperson encouraged customers who have Friday flights to come to the airport, adding they would be offered other flights if theirs had been cancelled.

Lufthansa workers jammed German air traffic this summer when they staged massive strikes led by trade union Verdi. But the airline doesn’t consider its agreement with Verdi to include UFO.