The firm is suspending flights from Belfast to London Gatwick.
They are however, being offered a €40 voucher.
He said the airline's CEO should "outline I suppose what he is doing to ensure that March is the very latest in terms of when this disruption will last and give a commitment that Ryanair will refrain from selling any seats on any flights that potentially could be cancelled".
Ryanair has also emailed each of the 315,000 customers whose flights were previously cancelled over a 6 week period in Sept and Oct. (Ryanair carries 15m customers every 6 weeks) It has offered each of these customers a Euro 40 travel voucher (EUR 80 return), again for travel between October and March 2018.
European safety regulations that take effect January 1 and require all airlines to use a regular calendar year for calculating pilot flight hours and working days. For 2017 the need to cram annual pilot leave into the nine months between April and December has led to a number of the flight cancellations.More news: Iran's top diplomat scolds Trump over missile launch tweet
"There are clear laws in place, which are meant to assist passengers in the event of a cancellation, helping minimize both the frustration and inconvenience caused by circumstances completely out of their control".
The airline also announced it would withdraw from bidding for Alitalia, the bankrupt Italian airline, to "eliminate all management distractions".
Ryanair has already grounded 2,000 flights up until the end of October, since the crisis over pilots' holiday came to light. Any customers affected have been notified via email that they can take an alternative flight or be refunded.
There was no immediate indication of how costly the latest cancellations would be to the company.
THE UK'S CIVIL Aviation Authority (CAA) has begun enforcement against Ryanair over its decision to cancel thousands of flights.
Ryanair is now scrapping 40 to 50 flights daily - "less than two percent" of its flying programme - to address problems caused also by air traffic control (ATC) delays, strikes and weather disruption.
On top of that, free flight vouchers it issued to passengers would cost an additional €25 million.