Update: Ryanair has now responded. The airlines says bookings good still be made from the "calendar form and 'Book Now' link instead of the homepage drop-down. "We took more bookings on 1 January 2011 than in 1 January 2010," an official claims.
Ryanair suffered an unfortunate web error on New Year's Day when users discovered they were unable to search for flights in 2011.
The problem appears to have surfaced at around midnight GMT on New Year's Day when users would be looking for flights in the coming months.
Rather than seeing months for 2011 in the drop-down menus in flight search, visitors were greeted with months for the previous year, 2010.
Flights for 2011 could be found on the site prior to 1 January 2011 - meaning the error probably only kicked in as the calendar turned from 2010 to 2011.
It is unclear as yet how many users were affected by the problem, but reaction was widespread and critical on social media channels such as Twitter.
The airline took around 14 hours to fix the problem. Ryanair has yet to respond to media queries regarding the incident.
This is not the first time in recent months that the airline has faced technical problems with its website. The Navitaire-run online booking and check-in system collapsed for up to nine hours in September 2010.