There is an uneasy wait for passengers as the two sides in the Aer Lingus dispute go head-to-head this week.
The Irish Airline Pilots' Association (IALPA) has given seven days notice of a work to rule after members voted 99% in favour of industrial action.
The dispute centres in a row over pay with pilots looking for a pay rise of 24%.
The work to rule means pilots will not work overtime, not accept amendments to published rosters, not log into the Aer Lingus portal or answer phone calls outside of work hours.
The airline responded by saying it believes the action is "entirely unnecessary."
Composite image shows an airport billboard panel with cancelled flights in March 2020, and an Aer Lingus flight at Cork Airport in November 2021. Picture by: Delphotos/AG News/Alamy Stock PhotoThe company said it will assess the impact of the full detail of the industrial action served by IALPA.
"It will inevitably result in significant disruption to our customers and to other employees," the carrier said.
"Aer Lingus will do everything possible to minimise the disruption to customers, but unfortunately a significant level of disruption is inevitable."
IALPA said it cannot rule out an escalation of industrial action going forward, if their demands are not met.
IALPA President Captain Mark Tighe said they are in this position "because management have failed to provide us with a meaningful offer on pay that accounts for inflation and the sacrifices made by pilots to save Aer Lingus during the pandemic".
"Our pay claim is entirely affordable, and Aer Lingus management need to quickly change position if they want to avoid this dispute escalating.
"If they don't come to their senses and acknowledge the reasonableness of our pay claim and implement it, the possibility of an escalation is always on the table," he added.
It is feared flights may be affected as early as next week.
