Aer Lingus staff in Cork and Shannon are to be briefed later today on the major new restructuring plan to be introduced at the airline.
Staff in Belfast and London are to be informed tomorrow.
The company yesterday unveiled plans to cut 676 jobs through voluntary redundancies by the end of 2011 to save €97 million annually. This is to include 100 pilot redundancies.
Aer Lingus wants to agree its restructuring plan within six weeks. If no deal is reached, the airline has warned it will close loss-making routes, sell aircraft and implement compulsory redundancies.
The airline is expected to lose up to €150 million this year and more than €100 million in 2010, as passenger numbers fall and fares contract. Trade unions described the plan as “extreme and draconian”.
Siptu national industrial secretary Gerry McCormack said staff who had already undergone a radical cost reduction programme last year "would not do it twice".
He said last year the union had agreed a plan including major work practice changes for 1,300 ground operation staff and it would not be revisiting this agreement. Siptu is to convene a national meeting of shop stewards at Aer Lingus to consider a response to the company plan.