RYANAIR is being sued by its employees as Irish pilots announce their fifth strike in less than a month.
The process of negotiating agreements with individual unions has proved complicated so far and the LCC is facing industrial action by pilots and cabin crew in several countries.
Ryanair cancelled 24 of around 2,300 daily flights after a second one-day strike by Irish pilots.
Irish-based Ryanair pilots are to stage their fifth one-day strike next week.
Last month, the budget airline criticised the strikes as unnecessary and warned that, if they continue, there could be job losses.
The news comes as talks between the two parties made little progress.
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Ryanair's pilots in Germany and the Netherlands have also voiced their support for the strikes launched by Ryanair's pilots in Ireland and could join the strikes any time in the near future, according to local media reports.
"This is part and parcel of life in aviation when you recognise unions", Ryanair Chief Marketing Officer Kenny Jacobs told Ireland's Newstalk radio station, pointing to years of wrangling over pay and conditions at rival Lufthansa.
"The airline's escalation of the dispute last Wednesday - when it threatened to sack 100 pilots and 200 cabin crew, or transfer them to Poland - led to a predictable hardening of resolve among its staff", the Forsa/IALPA trade union said in a statement. "It then changed its position and said it would not negotiate while strike action was planned".
The union said that two weeks have passed since their last meeting with management and warned that a resolution to the dispute can not be reached if the airline has "precondition" talks.
However, the union reiterated that it remains open to talks and is even prepared to explore the option of third-party facilitation - which to date has been ruled out by Ryanair.
Ryanair is seeking to make separate agreements in each of the markets it operates and has asked for a full week's notice of strike action to refund or redirect passengers.