Ryanair pilots are being balloted for strike action in a dispute over pay at the airline.
The Irish Airline Pilots Association - a branch of the Fórsa trade union - said its pilot members at Ryanair were frustrated and disappointed at the lack of progress in ongoing talks with the company.
The ballot started today and is due to conclude on Friday 9 August.
But IALPA said it would continue to engage with Ryanair to try to resolve the dispute.
The next meeting with Ryanair management is due to take place next Tuesday.
BA bid to block pilots strike over pay rejected
British Airways has failed in a legal attempt to temporarily block pilots from taking strike action in a dispute over pay.
The British Airline Pilots' Association (Balpa) announced yesterday that its members backed industrial action by more than nine to one, on a turnout of 90%.
BA took legal action in an attempt to halt the strikes, which it claims are designed to cause "the maximum in disruption" and could cost the airline up to £40 million a day.
Today, the airline applied for an interim injunction to prevent strike action by pilots based at Heathrow and Gatwick airports, arguing that Balpa's ballots did not comply with trade union law.
Following a hearing at the High Court in London, a judge dismissed BA's application for a temporary injunction, ruling that Balpa was "more likely than not" to establish at a full trial that its strike ballots were properly issued.
The judge gave permission for BA to appeal the ruling to the Court of Appeal.
Balpa agreed to give an undertaking to the court that it would not issue a notice of industrial action pending the outcome of any appeal.
Additional reporting: PA