EasyJet is advising passengers that they could face possible disruption due to a day of action by UK Border Force staff on Thursday, 10 July.
Thousands of civil servants are taking part, including border control staff, and for air travellers this may mean delays in the time it takes to get through the UK border gates at all UK airports.
EasyJet warned of potential disruption to normal service from 6pm on 9 July until midday on Friday.
The airline is advising its customers to use the ePassport gates (which accept the new swipe-chip passports) if they can, to avoid getting stuck in long queues.
“Passengers who qualify to use the ePassport gates are encouraged to do so wherever possible,” the carrier said.
More than a million council staff, including fire brigade personnel, health workers, teachers and civil servants will be participating in the day of industrial action.
According to the BBC, the government says fire authorities had “robust and well-tested plans that include back-up support if needed”.
Meanwhile, EasyJet has just announced a new year-round Edinburgh-Funchal service from February 3, 2015, along with winter weekly Aberdeen-Geneva flights from December 13 this year and a year-round Glasgow-Marrakech link twice a week from October 29, just in time for winter sunshine getaway season.
Northern Ireland residents will get new twice weekly flights from Belfast international airport to Reykjavik, set to start on December 12.