He apologised to the "small number" of customers affected by the cancellations, and said the airline would be doing its utmost to arrange alternative flights and/or full refunds for them.
Today alone a dozen Ryanair flights in or out of Dublin Airport have been cancelled.
We will cancel 40 to 50 flights daily for the next six weeks, (less than 2% of our schedule) with a slightly higher...
The airline is now moving to allocate annual leave during a nine month transition period (April-December 2017) to move the airline's holiday year (currently April-March) to a calendar year (January-December) from January 2018 onwards. The situation is repeated across Europe and thousands of passengers have already been affected.
Ryanair was yesterday accused of unleashing chaos after cancelling up to 2,100 flights - while telling passengers the move will help it to improve punctuality.
Budget airline Ryanair is cancelling up to 50 flights per day for the next six weeks after admitting that it "messed up" the planning of pilot holidays.
Ryanair, an airline popular for its affordable flights, carried more than 100 million passengers previous year.
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Ryanair has embarked on a six-week programme of cancellations as it seeks to reduce a backlog of crew holidays required by Irish regulators.
A further three flights out of Dublin - to Berlin, Glasgow and Kra ków - have been cancelled on Tuesday, with the return flights also cancelled.
The airline claimed that a number of factors had reduced its "on-time performance" to 80% in recent weeks, adding that the figure is "unacceptable to Ryanair and its customers".
Though these cuts are meant to fix the Irish-based airline's reliability, it has created a lot of social media backlash from passengers who have had their travel plans ruined by the airlines sudden widespread flight cancellations.
The airline cancelled 80 flights on Saturday and 82 on Sunday, leaving many passengers stranded when they were told via text message that their flights had been scrapped.
"We apologise to all affected customers for these cancellations", the airline wrote in a statement on Facebook.
Ryanair marketing officer Kenny Jacobs said affected customers with bookings up to 20 September had been informed.
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