Thousands of passengers in Europe are facing delays as cabin crew at German airline Lufthansa stage another strike.
Unions are seeking an increase in pay and guarantees against the use of temporary workers.
So far 190 flights from Frankfurt Airport have been cancelled.
Lufthansa is in the midst of a €1.5 billion cost-cutting programme.
The strike action by the Independent Flight Attendants Organization (UFO) is affecting airports in Berlin-Tegel, Frankfurt and Munich.
The airline says it “sincerely regrets” that the dispute is being waged at the expense of its customers.
It has also criticised the UFO for announcing the strike plans “at short notice” which it says creates additional problems for passengers.
Lufthansa has been forced to cancel a majority of its flights.
However the carrier says at this stage it cannot say for sure what exact impact the strike action will have.
The airline flies several routes from Dublin, Shannon, Knock and Belfast.
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