Aer Lingus passengers are facing further disruption this month after the breakdown of talks over cabin crew rosters.
Talks between union IMPACT and management at the company have failed, with two one-day strikes set to take place on Monday June 16 and Wednesday June 18.
Operations were grounded last Friday due to a 24-hour strike by staff.
Union spokesperson Michael Landers said the industrial action is unavoidable.
"As always, strike action is the last resort," Mr Landers said.
"Our members don't want to be on strike. They'd much rather be at work, looking after the travelling public.
"But we've been left with no other option.
"Before last week Aer Lingus wouldn't talk to us. They've talked to us this week but now they won't listen."