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The Cgil, Cisl and Uil unions said they would walk out because they have not been included in contract negotiations with the Ireland-based budget airline.
Pilots' union ANPAC said it would not participate because it is currently in talks with Ryanair, including for a pay increase.
Ryanair pilots in several countries mobilised after the company announced in September the cancellation of around 20,000 flights, which it blamed on a lack of standby pilots. In December, Ryanair said it would recognise pilots' unions for the first time in its 32-year history.