Aer Lingus has been forced to cancel 14 flights today because of the cabin crew dispute over rosters.
The airline says it anticipates further cancellations affecting up to 10% of its schedule over the coming days.
However, there is still no sign of any breakthrough that might resolve the dispute as it enters its tenth day.
The airline was forced to cancel flights to and from London Heathrow, Malaga, Madrid, Amsterdam, Manchester, Frankfurt and Birmingham.
An Aer Lingus spokesman said that to reduce the impact on passengers, the cancellations would affect flights where bookings were low and where customers could best be transferred to an alternative flight on the same route.
It is notifying passengers about cancellations, but it is also advising customers to check the company’s website for updates.
Meanwhile, cabin crew say they remain rock solid in their opposition to the new rosters at the centre of this dispute, which were introduced last week without union agreement.
So far, around 220 cabin crew have refused to operate the rosters, which they say are unreasonable and make family life impossible.
Almost 200 have been taken off the payroll, and further disciplinary procedures, which could result in workers being sacked, commenced yesterday.
Ryanair, which is a shareholder in Aer Lingus, has dismissed union claims about the cost of hiring its planes.
It said that it has provided five aircraft for Aer Lingus and will provide a sixth plane if it is required.
A Ryanair spokesman said: 'Ryanair will in common with other shareholders continue to support the Board and Management of Aer Lingus, to minimise disruptions to passengers and damage inflicted upon Irish tourism by this ill-judged, unnecessary and unwarranted trade union disruption.'
However, IMPACT is standing by claims that it costs €40,000 per return flight to Europe or the UK.
Fine Gael Transport Spokesman Simon Coveney has called on the Minister for Transport to intervene in the dispute.
Mr Coveney said: 'This dispute has gone on far too long. Aer Lingus management has a responsibility to shareholders, but also to the travelling public.
'The ongoing uncertainty about flights cannot be allowed to go unchallenged. It's about time our caretaker Minister for Transport stood up for the travelling public.
'I am calling on Minister Pat Carey to put public pressure on the management at Aer Lingus to agree to some form of mediation.'
Aer Lingus plans all flights through T2 in mid-February
Separately, Aer Lingus says it plans to have all its flights at Dublin Airport going through Terminal 2 by the middle of next month.
The airline already has all Heathrow, Gatwick and half of its European destinations serviced in the new building.
The remaining European flights are due to move from Terminal 1 within two weeks, while transatlantic flights are scheduled to move by mid-February.
An Aer Lingus spokeswoman said it was always planned to be a phased transition.
The US Customs and Border Protection opened full preclearance facilities at T2 last Wednesday and it is now handling all flights with the American carriers.
Etihad was the first airline to operate from the €600m terminal when it opened last November.
A spokesman for the Dublin Airport Authority said that the new terminal will cater for 40% of total traffic this year.
