Security staff at London’s Luton Airport have begun a strike planned to last for more than 40 days.
However the airport says there will be “no disruption” for passengers during the industrial action.
Members of union Unite walked out in the early hours of Wednesday morning and plan to stay away until 2059 on July 23, the BBC reported.
Unite says the strike is over “heavy-handed” changes to shift patterns. Previous strikes were held from May 1-5, May 7-13 and May 23-June 3.
It says a new shift pattern affecting up to 120 security guards could lead to staff working an extra 15 days and only getting nine full weekends free a year.
It is meeting the airport with an arbitration service on June 12 to try to resolve the dispute.
An airport spokesman said: “Previous walkouts by the same small number of Unite members have not caused any disruption and we would like to reassure passengers that it will be no different this time.
“Whilst we are disappointed Unite are continuing with their strike, we are pleased that [the union] has finally agreed to meet with us and we remain committed to finding a resolution.”