The budget airline only flew 573,692 people over the course of last month, down from 3.1mln in January 2020, with capacity plummeting 73%.
The load factor was 61% against 90.2% a year ago, so the total emissions in grams per passenger per kilometre were 35% higher than last year.
Last week, the carrier posted a €116mln statutory net loss for the three months to December 31, from a €21mln profit in 2019, with revenue down 76%
Operating costs decreased 52% to €291mln while staff costs were reduced by 43% to €33mln after job and salary cuts. to €149mln.
The firm strengthened its liquidity position with a €500mln three-year bond issued earlier in January, adding to the total cash balance of €1.2bn at the end of December.
It also continued with its aggressive expansion plan as it opened its Abu Dhabi base this month, with the inaugural flight departing on January 15.