Ryanair is planning to take a case to the European Court of Human Rights over a French supreme court ruling which found that the company's employees in Marseille are subject to French employment laws.
The Conseil d'Etat ruling endorsed the French government view that Ryanair employees operating Irish registered aircraft and contracts in Marseilles are subject to French employment law.
The company made an earlier attempt to have the case heard by the European Court of Justice but had its application refused by the Conseil d'Etat.
A statment issued by Ryanair this morning described the refusal as a denial of "the right to fair trial".
It said it would now challenge the legality of the decree before the European Court of Human Rights where it said it would correct what it described as an "obvious injustice."
Ryanair's Head of Regulatory Affairs and Company Secretary, Jim Callaghan, claiming the ruling was in breach of French, European and international laws insisted that "Ryanair is committed to defending the rights of its employees, including the right of its employees operating on Irish territory to rely on Irish labour law."
Mr Callaghan said Ryanair is "confident" that the European Court of Human Rights would correct "the obvious injustice" caused by the French judicial system.