Further strikes will take place at Stansted Airport this month.
30 GMB members who operate the security scanners for checked luggage at the airport will strike on October 10 and October 11 over pay disputes.
This was after recent talks at ACAS failed to make any progress.
The strike begins at 3.45am on Saturday, October 10 and continues until 1.45pm on Sunday, October 11.
These members also took strike action on August 23, August 31, September 12 and September 13.
The members, employed by private contractor Mitie, voted by 87%, in a turnout of 80%, to strike in support of their claim for a 3% pay rise. The members have rejected the 1.5% offer from the company.
Gary Pearce, GMB Organiser, said: "When we met at ACAS the company claimed they could not afford a pay rise of 3%. GMB members simply do not accept this.
GMB members involved in the dispute remain determined to get a pay rise irrespective of how long it takes Mitie to sort this out."
Comments: Our rules
We want our comments to be a lively and valuable part of our community - a place where readers can debate and engage with the most important local issues. The ability to comment on our stories is a privilege, not a right, however, and that privilege may be withdrawn if it is abused or misused.
Please report any comments that break our rules.
Read the rules here