Lufthansa has grounded nearly a third of its entire schedule Wednesday, stranding about 100,000 passengers as the carrier’s flight attendants walked off the job for the fifth time in six days.

Most of the airline's U.S. flights were caught up in Wednesday's disruption, with routes to Boston, Charlotte, Chicago O'Hare, Denver, Los Angeles, New York JFK, San Francisco and Washington Dulles among those showing cancellations.

The attendants union is in the sixth day of a weeklong strike that has created chaos for hundreds of thousands of Lufthansa’s passengers. The carrier has been forced to ground nearly 3,000 flights since the labor disruption began last Friday. All told, more than 300,000 passengers have been affected by strike-related cancellations, according to Lufthansa.

Wednesday’s walkout by attendants was to hit Lufthansa’s flights at Frankfurt, Munich and Dusseldorf – the carrier’s three biggest hubs. The union pledged to continue its action through this coming Friday, even hinting it might extend the strike, Bloomberg News reports.

“Lufthansa will do its utmost to keep the effects of a strike to a minimum and to inform passengers as soon as possible,” the carrier said in a message to fliers post on its website. “For that reason, Lufthansa requests all passengers early on to stay up-to-date by checking the flight status on LH.com.”

Among the key disputes are retirement benefits, The Associated Press reports. In particular, attendants are reportedly unhappy on Lufthansa's plans regarding "transition" payments for crew retiring before government benefits begin.

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