Ryanair passengers face the prospect of summer chaos after pilots served notice of a 24-hour strike next Thursday - and threatened there will be more to come.
They claim that Ryanair is not taking them or their demands seriously and that progress on improving pay and conditions for staff is too slow.
Gabriel Mocho Rodriguez of the International Transport Workers Federation said some unions affiliated to it are already balloting for industrial action or are planning to.
After negotiations with the airline broke down, the Ialpa Union said that a landslide 99% of their members had supported the industrial action in a ballot.
If the strike goes ahead, it will impact Ryanair flights out of Dublin, one of Ireland's busiest hub airports.
Disgruntled staff are demanding changes to arrangements for transferring flight crew between European and north African bases as well as seniority and holiday arrangements.
Pilots in Ireland, where Europe's biggest low-priced airline is based, voted 94 to 1 in favor of industrial action including strikes, a spokesman for the Irish Air Line Pilots' Association said on Tuesday, confirming a Bloomberg News report.
This compared with just 41 cancellations in June previous year.
News of the strike comes just hours after the airline revealed another month of travel misery as air traffic control strikes left more than 210,000 passengers with cancelled flights in June.
The low-priced group repeated its call for action from Europe to help tackle disruption from the strikes.
The airline has said it hoped to sign more recognition deals with pilots and cabin crew unions "over the coming weeks and months".
Ryanair has around 100 directly employed pilots in Ireland with another 200 on personal services contracts. Those customers will be allowed to check-in up to 60 days before flying.
"FR crew have the right to workplace protection and to enjoy the same fair and equal treatment as their unionised counterparts", Anu Hietala and Oliver Richardson, ETF civil aviation section presidents.
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