"After a year of negotiations, the failure of Ryanair to recognise Sepla and apply Spanish labour legislation for the pilots who operate in Spain forces the union to take a legal path to attain this objective", the union said in a statement.
Ryanair's call for talks with its Ireland-based pilots' union Forsa over labour disputes has been rejected, said the airline on Thursday. The strikes will coincide with stoppages by colleagues in Sweden and Belgium who announced their plans to strike on Wednesday.
On Friday, around a quarter of Ryanair's 350 pilots based in Ireland took part in a fourth one-day strike.More news: Apple hits record market capitalisation of $1 trillion
Since Forsa has called for another strike before the meeting there is no point for Ryanair to meet with the union, said the statement, adding that Ryanair will notify its customers about the cancellations of 20 flights due to the strike, which will affect a total of 3,500 customers.
Unrest surfaced at Ryanair following a planning mix-up in September 2017 which led to 20,000 flights being cancelled.
"We now call on Forsa to accept Mr Mulvey as a third party mediator, an initiative Forsa have repeatedly called for in recent weeks", he said.
Pilots in Germany and the Netherlands are considering joining in.More news: Venezuelan President Nicolas Maduro Survives Apparent Assassination Attempt | Trending
The gap between the sides is narrow given that Ryanair has already agreed to 9 of FORSA's 11 requirements, and yet FORSA keep calling unnecessary strikes, to disrupt Irish customers during the peak travel period.
"Company management met the union the day before the first one-day strike, and two days before the second one-day strike (on July 18)".
Ryanair cancelled 16 of around 2,300 daily flights on after the third one-day strike by Irish pilots.More news: Girl at center of AMBER Alert out of Reagan National Airport found