Ryanair's Chief Financial Officer (CFO) Howard Millar is to step down as a full-time executive in December, the company announced today.
Mr Millar, who is also the airline's deputy CEO, will join Ryanair's board as a non-executive director next year.
He will be replaced as CFO by Neil Sorahan, the carrier's current Finance Director.
Ryanair chief executive Michael O'Leary paid tribute to Mr Millar, who joined the company in 1992.
“I sincerely thank Howard for his enormous contribution to Ryanair’s successful growth over the last 23 years," Mr O'Leary said.
"He has been a pioneer in the development of low fare air travel in Europe, as well as in aircraft financing, commodity risk and fuel management, IT systems and treasury fields of the aviation industry."
Mr Millar said he was looking forward to pursuing "new career opportunities".
His successor Mr Sorahan has worked in Ryanair for almost 12 years, having joined from CRH in 2003.
As Finance Director he has been operating as Mr Millar’s deputy for the last eight years and is described by the company as a "key leader in Ryanair’s Finance Department".
"All of us in Ryanair look forward to working with Neil as he becomes Chief Financial Officer," Mr O'Leary said.