"Industrial action must be expected again any time from now," he added. "The only thing we can disclose to our passengers is that we will leave out the Christmas holidays - specifically December 24, 25, 26."
Industrial action on Monday, Dec. 23, could not be ruled out, he said. Lufthansa said separately that arbitrators had proposed a further meeting with UFO for early January. "Lufthansa continues to expect that good solutions can be found for the 22,000 cabin crew members with regard to the arbitration issues," the airline said in a statement.