A number of flights to and from France have been cancelled as air-traffic controllers in France stage a three-day strike.
The protests are against European Union plans to create a single European airspace under the "Single European Sky" banner.
Aer Lingus has cancelled flights to France from Cork and Dublin.
Ryanair has also had to cancel a number of its flights from various hubs around Europe.
Intending passengers should check their airline’s website for details.
One in two flights to airports serving Paris, Lyon, Nice, Marseille, Toulouse and Bordeaux were cancelled, France's DGAC civil aviation authority said.
France's main airports have warned of major travel disruption.
The strike is part of a wider European action that, outside France, mainly involves a go-slow.
Air France said it was cancelling an unspecified number of short- and medium-haul flights.
Preparations for the maiden flight of Europe's newest passenger jet, the Airbus A350, were also affected by fallout from the strike.