Ryanair's passenger figures slumped by 83% in December as Covid-19 restrictions continue to impact the aviation sector.
Ryanair said it carried 1.9 million passengers last month, down from 11.2 million in December 2019.
The airline said it operated about 22% of its normal December schedule with a 73% load factor.
In November, Ryanair posted a loss for its key summer period for the first time in 30 years as Covid-19 restrictions pulverized demand.
The airline also warned that it may only carry half its normal passenger numbers next year.
Covid-19 restrictions cut Ryanair passenger numbers by 80% in the six months to September 30, the first half of its financial year and the period when it typically makes most of its annual profit, pushing it to a €197m loss.
That was the first summer loss recorded by the airline since 1990. It recorded a profit of €1.15 billion the same time time last year.
Ryanair did not give a profit guidance for the full-year.
But group chief executive Michael O'Leary said it was likely to post a deeper loss in the second half of the year, which would make it the airline's first annual loss since 2009.