Ryanair has said it will challenge a decision by France's highest court that local labour laws apply to Ryanair and EasyJet cabin staff based in France.
The court rejected a claim by both low-cost airlines that their cabin staff worked for company headquarters outside France and were therefore not subject to French law.
British airline EasyJet said it had already started conforming to French labour law but Ryanair said it would take the case to the European Court of Justice.