22 September, 2017
Other airlines say Ryanair's woes are also due to pilots leaving for better pay and conditions.
His comments came at the airline's annual general meeting in Dublin.
Scandinavian rival Norwegian Air confirmed on Monday that 140 pilots have left Ryanair to join their ranks this year, and that they were continuing to recruit pilots for their new Dublin base.
This is on top of a cash bonus already offered to pilots, which has been given a frosty reception.
O'Leary refused to discuss media reports that many pilots had turned down offers of a €12,000 bonus and instead demanded improved contracts.
One passenger told the Daily Telegraph that the website would not let them book on a flight "unless I paid twice for the seats and bags". Compensation and lost fares for the cancelled flights will cost €25m ($30m).
Ryanair CEO Michael O'Leary admitted mistakes to disgruntled shareholders Thursday as the airline struggles to overcome a scheduling crisis that is costing the company millions of euros.
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Until now, they say, they've been scattered and isolated, making them much less powerful.
They seem to have found that voice.
"Every day there are vacancies advertised with attractive packages attempting to entice pilots to relocate to Asia, and in some cases even allowing pilots to be based locally at home", says OAG's latest blog.
If these pilots refuse to work extra days, more cancellations could be on the way.
The letter, which the BBC said comes from staff all over Europe, reportedly says new contracts will stop the large exodus of Ryanair pilots to competitors.
Ryanair will force pilots to delay planned annual leave as it battles to overcome shortages in coming weeks.
"There's an underlying problem at Ryanair, which is quite simply that the company can not replace pilots as fast as they quit", he wrote.
Ryanair said extra customer service staff had been brought on to help with flight changes and processing refunds and it expected 95% or around 300,000 of customers affected to have alternative travel arrangements in place or refunds.by the end of the week.