Jet2 has issued a warning to passengers as Border Force workers go on strike.
Up to 100,000 members of the Public and Commercial Services union (PCS) will strike in another long-running dispute, over pay, jobs and conditions.
Those taking part work for government departments including the Border Force. The PCS is seeking a pay rise of 10% after the government offered 2%, which the union complained was well below the soaring rate of inflation.