A secret ballot was held at the weekend and the majority of I.A.L.P.A. members voted to support industrial action five days before Christmas.
The I.A.L.P.A. is a registered trade union and is a branch of the trade union IMPACT and affiliated to I.F.A.L.P.A., the International Federation of Airline Pilots Associations.
Members voted overwhelmingly in support of strike action - 94 per cent in favour of industrial action.
The decision to strike will, should it go ahead, cause significant disruption for some people returning home for Christmas.
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Why are they striking?
Ryanair pilots want to replace what is known as employee representative councils with a collective bargaining system that would, in turn, take responsibility for all negotiations with the company right across Europe.
IMPACT official Ashley Connolly said: “This dispute is solely about winning independent representation for pilots in the company.”
Ryanair argues that, as a company, the current structure fulfils their obligations and they believe they have approval from the Supreme Court.