Members of a pension scheme who say they have been "betrayed" by Aer Lingus and the Dublin Airport Authority (DAA) last night protested outside Transport Minister Paschal Donohoe's home in north Dublin.
The demonstration was by around 60 members of the Deferred IASS (Irish Airlines Superannuation Scheme) Action Group, who say the terms of the defined benefit pension scheme they had agreed with the two companies have been broken.
The IASS scheme was €700m in deficit at one point, which led an expert panel to propose a reduction in pensions paid to retired workers.
Members of the scheme last night said they have lost 50pc on average of their pension entitlements - with some losing up to 60pc.
"There are people who will now end up on less than the non-contributory old-age pension despite having worked all their lives and contributed to their pensions," spokesperson Eddie Gilmartin said.
Some protesters expressed concern that the expected sale of Aer Lingus would "further reduce" the chance of having their pensions restored.
Mr Donohoe said such protests outside his home were "unacceptable" and would not impact on any decisions he takes on the matter.