Planned strike action by air traffic controllers in France is likely to cause a number of Irish flight cancellations tomorrow.
Ryanair said the strike will cause 26 flights to and from France to be cancelled.
The low fares airline said passengers due to travel tomorrow should check the status of their flight on the Ryanair.com website before travelling to the airport.
A spokesman for the airline said further delays and cancellations are likely.
Aer Lingus has said it has cancelled one return flight between Dublin and Paris due to the strike.
In a statement, Aer Lingus said there may be further delays to flights using French airspace.
Several unions representing air- traffic controllers at airports in Paris, Lyon, Marseille and Toulouse have called the one-day strike.
At Charles de Gaule and Orly airports in Paris, 30 per cent of flights will be cancelled, while at airports in Lyon, Marseille, Nice and Toulouse the reduction will be 20 per cent.