The strike is due to end tomorrow morning.
Anyone intending on flying today is being asked to check with their airline before heading to the airport.
The advice comes as air traffic controllers in France hold yet another day of strike action.
It's due to come to an end tomorrow morning, but travellers are being advised to be ready for changes.
Ryanair had to cancel 400 flights today.
CEO and Mullingar's Michael O' Leary is calling for the European Commission to insist that France protect overflights during strikes:
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