Dublin-based pilots at Ryanair are staging a third one-day strike today.
Around 100 pilots are picketing the airline's headquarters in Swords.
The airline has cancelled 16 flights between the UK and Ireland as a result of the strike, which it says involves around a quarter of its Irish pilots.
The Fórsa trade union, meanwhile, says the pilots are continuing to seek a fair and transparent method to govern base transfers.
A disputes committee at the trade union will meet tomorrow to consider further industrial action.
Image: Paul Quinn
Forsa's Head of Communications Bernard Harbor has criticised Ryanair for not taking up the offer of talks it made last Friday.
He said: "We wrote to the company on Friday afternoon last week to say we were available for talks, but we haven't had a response to that invitation.
"Really we need Ryanair to step up a little bit, and to get down to the nuts-and-bolts of trying to resolve this issue."
Ryanair itself has continued to describe the industrial action as 'unnecessary'.
In a statement this morning, it claimed the striking pilots "can't explain" their proposals over seniority and base transfers - adding the issues "don't even affect them".