Aer Lingus says staff won't have their hours and pay restored after SIPTU members voted down a recovery plan agreed with union bosses.
They voted by 55% to 45% against the Covid-19 crisis recovery plan proposed by the airline.
The proposals were put to a ballot of the union's 1,500 members at Cork, Dublin and Shannon airports over recent days.
SIPTU says its negotiators will now meet with shop stewards to try to chart a way forward.
