Ryanair's Belgium cabin crews have now become the latest group to join strikes due to take place at the end of the month throughout Europe.
Irish holidaymakers could be facing further disruptions this summer after crews across Europe announced plans to strike.
The action could have significant impacts on Irish passengers as flights may be forced to be cancelled.
READ MORE: Ryanair cabin crew rants about employer over intercom on flight from Spain ahead of strike action
Fears that a similar situation seen in France last week will arise in Ireland have now come to the surface after Ryanair's French cabin crew went on strike on Sunday and Monday, demanding better pay and working conditions.
According to a union representative, the strike saw more than 40 flights being cancelled.
Here are the dates you need to know if travelling to Belgium, Portugal, Spain or Italy.
Belgium
Trade unions representing cabin crew of Ryanair (RYA.I) plan a strike later in June in Belgium and elsewhere in Europe, increasing disruption for passengers to and from Belgium during a peak holiday weekend and a European Union summit.
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 tree day strike will go ahead on June 24, 25 and 26.
The strike could see a possible 50 flights to and from Ireland to Portugal impacted over the course of the three days.
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, 35, 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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