“The situation is being monitored closely by our ground and operations teams. We plan to operate all flights to schedule, and our check-in desks will close 40 minutes before the scheduled departure time.

“We will also be putting contingency plans in place to ensure that our flights continue to operate as normal and any disruption is kept to an absolute minimum.

“We will be in contact with customers directly should there be any impact on their flight.”

Customers have been asked to make sure their details are correct on the Jet2 system so the airline can contact them with any updates.

Unite general secretary, Sharon Graham said: “North Air is a highly profitable company that can fully afford to make a fair offer to our members but has refused to do so.

“Unite will always support our members in their fight for better jobs, pay and conditions.

“North Air has no concern for their workers or the travelling public. Unite has had no option but to confirm imminent industrial action.

“North Air now has very limited time to resolve this dispute. The company’s belligerence is at serious risk of causing widespread travel disruption at Edinburgh airport over the festive season.”