Tens of thousands of passengers are set be affected by a French air traffic control strike on Friday.
Ryanair has cancelled 420 flights, most of which were scheduled to fly over France, affecting 80,000 passengers.
EasyJet is cancelling 76 flights, British Airways will cancel 22, while Air France said it would only run 45% of its short-haul flights.
The SNCTA air traffic control union said the walkout was over wages, as inflation soars, and recruitment.
The cancelled flights include many that fly over France, not just those to and from the country.