SIPTU has urged Aer Lingus to adhere to the industrial relations process during its restructuring talks.
The comments come in the wake of a highly successful response to the airline's severance deal which will see 1,325 workers leave.
Staff over-subscribed by some 300 to avail of the generous package of nine weeks pay per year of service.
Despite that, the semi-state is being warned that industrial action is a real possibility if it strays from the beaten path.
SIPTU's National Industrial Secretary, Michael Halpenny, said that the Government also has a vital role to play in meeting its commitments to engage with the unions and the workforce on the future of the company.