British Airways is looking to shed 400 senior cabin crew jobs.
But the airline stressed that there would be no compulsory redundancies and the decision will not affect Northern Ireland staff.
A BA spokesman said the airline had entered into a 90-day consultation with the Unite union about the possibility of making voluntary redundancy available to 400 of its 14,000 cabin crew staff.
BA had a damaging months-long cabin crew dispute that ended last year.
Unite's Oliver Richardson said: "This is a bitter disappointment at a time of economic uncertainty and will be a blow for loyal staff who now face an uncertain Christmas and new year...any attempts to force people wanting to continue working for BA out of a job will be resisted."