Further air travel disruptions have been confirmed for Ryanair passengers on Friday.
German pilots announced they're joining the 24-hour strike at the airline.
Pilots in Dublin, Belgium and Sweden have already confirmed they're holding industrial action.
Twenty out of 300 Irish flights have been cancelled affecting 3,500 passengers.
The Dutch pilots union could also take part but they only have to give twelve hours notice to the airline if they intend to strike.
If all 5 countries carry out the strike, over 25,000 passengers are set to be hit by cancellations.