Ryanair has confirmed the cancellation of 24 flights to Britain on Friday, 20 July, as a result of planned industrial action by pilots.
In a statement, Ryanair said all customers affected have been contacted by text or email and any passenger who has not received a communication should expect their flight to operate as scheduled.
Ryanair said it was cancelling flights on high frequency routes to Britain where customers can transfer to other flights.
The company said the second day of strike by 25% of Irish pilots was "unnecessary" because they have been given written proposals that address their concerns about seniority.
It said that customers on affected flights would refunds or free transfers to other flights on alternative dates.
Around 100 members of the Irish Airline Pilots' Association (Ialpa) part of the Fórsa union are in dispute with Ryanair over base transfers, promotions and leave among other issues.
A union spokesperson said they have invited management to talks either tomorrow or Thursday and are awaiting a response.
The spokesperson said that current Ryanair proposals are not enough to resolve the issue but said his members remain committed to gettting a resolution.
They added that the striking pilots are those directly employed by Ryanair with 99% of the 120 balloted voting for industrial action.
Ryanair has over 250 self-employed pilots which allows the airline to operate most of its routes during the strikes.