Ryanair has announced that it would cancel 40-50 flights daily for the next six weeks (to the end of October) to improve its system-wide punctuality which has fallen below 80% in the first two weeks of September through a combination of ATC capacity delays and strikes, weather disruptions and the impact of increased holiday allocations to pilots and cabin crew.
Ryanair has not published a list of the flights affected and said it will contact passengers directly.
But passengers took to social media to complain to the company.
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Fianna Fáil transport spokesperson Robert Troy said the decision to cancel the flights without adequate notice has caused deep concern to the passengers affected.
Ryanair has advised customers that flights will be operating as scheduled unless passengers have received a cancellation email. "Most stressful days of our lives".
Ryanair is mandated under the Irish Aviation Authority to bring staff holidays in line with the calendar year from January 1, requiring it to allocate the leave before the end of the year.
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No Ryanair flights from Leeds Bradford appear to have been cancelled today, with departures to Venice, Dublin and Chania getting underway this morning.
The airline is now allocating annual leave during a nine-month transition period - April to December 2017 - to move the airline's holiday year - now April to March - to a calendar year (Jan to Dec) from 1st January 2018 onwards.
"We sincerely apologise to the small number of customers affected by these cancellations, and we will be doing our utmost to arrange alternative flights and/or full refunds for them".
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These problems "severely reduced our on-time performance over the past two weeks to under 80 percent", he said. By cancelling less than 2 per cent of our flying programme over the next six weeks, (until our winter schedule starts in early November) we can improve the operational resilience of our schedules and restore punctuality to our annualised target of 90 per cent.