AER Lingus has already cut 500 jobs and is currently finalising an additional 84 redundancies as it grapples with the impact of the Covid pandemic.
The losses represent more than a tenth of the 5,000 people the airline employed at the end of June last year.
Its interim CEO, Donal Moriarty, confirmed the extent of the job losses this morning as Aer Lingus owner IAG revealed the scale of losses inflicted on the Irish carrier during 2020.
Aer Lingus plunged to a €563m loss last year, which included €202m of exceptional items. It had made a €276m pre-exceptional operating profit in 2019. Its passenger revenue slumped 81.4pc to €382 last year, while cargo revenue jumped to €88m in 2020 from €34m.