Irish holidaymakers who have booked trips to Europe this summer may face disruption to their flights.
Ryanair cabin crew have threatened industrial action in Spain, France, Portugal, Italy and Belgium over a pay dispute.
Unions such as SITCPLA and USO have come together to demand pay increases, and now claim they may have "no other option" but to strike.
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A spokesperson for SITCPLA said: “We’re coordinating our actions with European counterparts.”
However, Ryanair halted talks with two Spanish unions this week, according to Bloomberg.
It is not clear when the strikes could take place, or how many flights will be affected.
A spokesperson for Ryanair told The Mirror UK : “Ryanair has negotiated collective agreements covering 90% 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.
"In Spain, we are pleased to have reached a collective agreement with CCOO, Spain’s largest and most representative union, delivering improvements for Spanish-based cabin crew and reinforcing Ryanair’s commitment to the welfare of its cabin crew.
"These announcements by the much smaller USO and SITCPLA unions are a distraction from their own failures to deliver agreements after three years of negotiations and we believe that any strikes they call will not be supported by our Spanish crews.”
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