Fórsa has signed a deal with Ryanair making it the sole negotiating union for the airline's directly employed cabin crew in Ireland.
The agreement was signed yesterday by Fórsa officials, cabin crew representatives and Ryanair management.
Fórsa official Ashley Connolly says the union won't be intimidated by Ryanair's tough approach to industrial relations.
Ms Connolly said: "I think that Fórsa has proven itself over the years to be equally as tough when required and when needed.
"It is important for, the first time in Ryanair, that cabin crew members have themselves have a voice. They will be to the forefront of any discussions I have and they will be present at every meeting that I carry out with the company."
It follows Ryanair’s cabin crew recognition deals with the Italian ANPAC, ANPAV and Fit-Cisl unions, UNITE the union in the UK and the Ver.di union in Germany.
Ryanair’s Chief People Officer, Eddie Wilson said: “We are pleased to sign this cabin crew recognition agreement with Forsa in Ireland. We look forward to working closely with both Forsa and their Company Council to address issues of concern to our directly employed Irish based cabin crew.
"This is a further sign of the progress Ryanair is making with trade unions since our December 2017 decision to recognise unions, with over 65% of our cabin crew now covered by recognition agreements and we hope to sign more agreements in the coming weeks.”