Two separate groups of workers at Gatwick airport are to begin balloting for industrial action over pay.
If the workers vote for strike action, passengers at Gatwick are set to face delays and disruption later this summer.
Unite is conducting a ballot of over 100 members working for ICTS, who are employed to scan passengers’ luggage for explosive materials and other dangerous and prohibited materials.
The workers are paid just £8.50 an hour and are seeking an increase of 50 pence an hour.
Unite is also balloting members employed by outsourcing giants ISS.
The workers are involved in maintaining the facilities at Gatwick airport for example ensuring that toilets have the appropriate materials, as well as assisting with moving luggage and rearranging furniture.
The ISS workers are currently paid £8.49 an hour and have been forced to ballot for industrial action after management reneged on a pay offer.