Speaking this evening, Bernard Harbour said: "While Ryanair management said they recognised Impact and IALPA (the pilots union) for collective bargaining, they said they were unable to give the union a piece of paper to confirm this recognition".
The union said a recognition agreement had to be agreed by midday on Thursday and warned its mandate for strike action could still be implemented "in the absence of a timely agreement".
He said the union put forward a pilot framework proposal to fast track negotiations and that the airline was happy for the union to have taken an approach to deal with the issues quickly.
"We think this is disappointing given all that's been said in the media over the last five days by the company".
It forced the budget airline to recognise a pilots' union and brought about talks with IMPACT union scheduled for later today.
"Recognising unions will be a significant change for Ryanair, but we have delivered radical change before, most recently when we launched Ryanair Labs and our highly successful Always Getting Better customer improvement programme in 2013".
Back in September, they were forced to cancel 20,000 flights due to a roster error which forced them to offer pilots bonuses of €10,000 to keep other planes in the air.
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The airline reversed its longstanding refusal to recognize pilots' unions last week, saying it had invited several for talks because it wished to "avoid any threat of disruption to its customers and its flights from pilot unions during Christmas week".
Today, Ryanair will meet with a workers union in a move that is historic for the company.
"We have had a number of threatened strikes across a number of countries in Europe and to protect our passenger's travel plans over the Christmas period we've chose to make that decision now".