Ryanair has filed legal action against the French government over what the airline sees as an "unlawful labour decree".
Ryanair is upset at what it claims is an attempt by the French to force foreign airlines to apply French labour laws when they base aircraft in France.
The legal action has been filed with the French Conseil d'état.
Ryanair's head of regulatory affairs and company secretary, Jim Callaghan, said the ruling ''is contrary to European laws on free movement of labour and services and the freedom of establishment and is also contrary to the liberalised air transport market.''
He added that the ruling is designed to discourage foreign airlines from establishing a base of operations in France in order to compete with the high fare monopoly, Air France.
Ryanair has also filed a complaint to the European Commission calling on them to overturn the ruling.
