* Ryanair says will be a "significant change"
* Pilots in several countries had planned strikes
* Ryanair says no reason costs should increase as a result (Adds detail on planned strikes, company comment)
DUBLIN, Dec 15 (Reuters) - Ryanair announced on Friday that it would recognize pilot unions for the first time in its 32-year history in a bid to stop its first pilot strike from taking place later in the day.
Chief Executive Michael O'Leary's refusal to recognize unions was at the heart of the ultra low-cost model he developed to turn a small Irish regional airline into Europe's largest carrier by passenger numbers.
"Recognizing unions will be a significant change for Ryanair, but we have delivered radical change before," O'Leary said in a statement. "We hope and expect that these structures can and will be agreed with our pilots early in the New Year."
The move comes after pilots in several countries threatened strike action in the busy run-up to Christmas.
The Irish carrier said it would hold talks with unions in Ireland, Britain, Germany, Italy, Spain and Portugal to recognize them as long as they established a committee made up solely of Ryanair pilots, "as Ryanair will not engage with pilots who fly for competitor airlines in Ireland or elsewhere."
Pilots and ground crew in Italy were due to take action first with a four-hour strike later on Friday, to be followed by a 24-hour stoppage by pilots in Ireland and Portugal on Dec. 20.
The pilots have mobilized in the wake of the announcement of 20,000 flight cancellations by the Irish carrier, which it blamed on a lack of standby pilots due to a failure in its rostering following a rule change by Irish regulators.
Ryanair had brought back Peter Bellew, previously the CEO of Malaysia Airlines and Ryanair's former director of flight operations, to help deal with the staffing issue.
The airline's Chief People Officer Eddie Wilson said there was no reason to think costs would increase as a result. (Reporting by Conor Humphries; editing by Jason Neely and Adrian Croft)