Unions representing staff and cabin crew for Ryanair in Italy have called a 24-hour strike for June 25, coinciding with walkouts the budget airline is facing the same day in other parts of Europe.

Unions FILT-CGIL and UIL Trasporti said they were seeking improved pay and conditions after staging a four-hour stoppage earlier in June.

Yesterday, Portugal's union of civil aviation personnel SNPVAC said Ryanair's Portuguese cabin staff will go on strike for three days in late June.

The workers, demanding compliance with Portuguese law and better working conditions, will walk out on June 24, 25 and 26, SNPVAC said in a statement.

"This mobilisation is not only an opportunity to put the spotlight on multiple attacks on workers' dignity and to make this reality known but also a moment to show unity and solidarity against dumping", the union added.

The news came after Ryanair's Spanish cabin announced a six-day strike planned for late June and early July.

The staff will walk out on June 24, 25, 26 and 30 and on July 1 and 2, as they are unhappy with working conditions and pay, USO union said.

French cabin crew at Ryanair went on strike on Sunday and Monday demanding better pay and working conditions, a union representative said earlier, adding that more than 40 flights had to be cancelled.

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Labour unrest and staff shortages in Europe are causing headaches for travellers heading into the peak summer season, with airports and airlines clamouring to find more workers, minimise cancelled flights and reduce delays.