A number of flights to and from Ireland have been cancelled due to another strike by French air traffic controllers.
It is the 13th strike in 14 weeks.
Passengers due to travel today have been urged to check the status of their flight online.
Ryanair said it has cancelled 102 flights due to the strike action and has called on the European Commission to intervene in the row to alleviated the impact of the protests on passengers.
Aer Lingus has cancelled eight flights and also warned of possible delays to flights, which have to use French airspace.
Ryanair added: "Unfortunately, further flight delays and cancellations are likely and customers are asked to please monitor this notice which will be updated throughout the day.
"Ryanair sincerely apologises for any inconvenience caused by these unjustified ATC disruptions which are entirely outside of our control."