Ryanair cabin crews across Europe have planned strikes that are due to go ahead at the end of this week.
The action could cause significant disruption for many passengers for the remainder of the month and into the beginning of July.
Unions representing Ryanair workers in various European countries said workers are demanding compliance with law and better pay and working conditions.
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However, Ryanair has said it expects there to be little disruption to flights despite similar strikes in France last week saw more than 40 flights being cancelled, according to a union representative.
A Ryanair spokesperson said: " Ryanair has negotiated collective agreements covering 90 per cent of our people across Europe. In recent months we have been negotiating improvements to those agreements as we work through the Covid recovery phase.
"Those negotiations are going well and we do not expect widespread disruption this summer."
Here's everything that we know about the strikes that will take place.
Belgium
Trade unions representing cabin crew of Ryanair (RYA.I) plan a strike later in June in Belgium.
The ACV and BBTK unions said they were forced into action because Ryanair was not respecting Belgian labour law covering such issues as the minimum wage or pay of cabin staff for certain pre and post-flight work.
Unions representing Ryanair workers in various European countries said on Friday that they were planning a strike in Belgium from June 24 to June 26.
Portugal
Ryanair's Portuguese cabin crew have said a three day strike will go ahead on June 24, 25 and 26.
Workers are demanding compliance with Portuguese law and better working conditions, Portugal's union of civil aviation personnel SNPVAC said in a statement on Tuesday.
"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.
Spain
The strike in Portugal comes just one day after Ryanair's Spanish cabin crew announced a six-day strike.
The action will take place on June 24, 25, 26 and 30, and on July 1 and 2.
Workers have cited discontent with working conditions and pay as the reason for the strike.
Italy
Ryanair's Italian cabin crew has become the latest to announce strikes after unions representing staff in Italy called for a 24-hour strike on June 25.
The action will coincide with walkouts in both Spain and Portugal.
Unions FILT-CGIL and UIL Trasporti said they sought improved pay and conditions after staging a four-hour stoppage earlier in June.
Irish Ryanair cabin crews have not voted to strike, but the strike action will potentially affect thousands of Irish with holiday plans this summer.
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