Aer Lingus grades represented by SIPTU have rejected negotiated proposals for pay cuts and work practice reforms.
The package would have kept pay at 50% of pre-Covid rates, rather than the current more severe cut to 30% of pre pandemic pay and averted layoffs.
It's understood that 55% of those who voted rejected the deal.
Cabin crew represented by Fórsa had previously rejected a similar package, though the deal they balloted on had already been withdrawn by Aer Lingus management because unions had missed a deadline for acceptance.
However, pilots have accepted a separate set of proposals which included fixed dates for gradual restoration of pay.
