Dublin-based pilots at Ryanair have announced a fifth strike date.
Staff will refuse to work for 24 hours from 1am on Friday August 10th. Ryanair says it will cancel 20 Irish flights that day, and will contact affected passengers.
Ryanair pilots in Sweden and Belgium have already announced they still go on strike that day.
Earlier, the airline said it had hoped a fresh round of talks to end the ongoing row over working conditions would take place on Tuesday.
Ryanair invited FORSA to talks on Tuesday morning at 11am, however it's unclear if that meeting will go ahead.
Kenny Jacobs from Ryanair has described the action as "irresponsible, unwarranted and disrupting" for customers.
He also says Ryanair has agreed to "9 of FORSA’s 11 requirements", with the airline describing the gap between the sides as "narrow".
Dublin-based pilots will hold a fourth strike tomorrow, while Ryanair pilots and cabin crew in other European countries are also taking action.
British-based pilots working for Ryanair have also made their first hint that they could be on their way to taking action.
Experts have warned that continuing action is likely to affect bookings at one of the busiest times of the year, as people begin to make plans for Christmas.