According to the Unite union, around 100 security officers and terminal technicians employed by the airport will begin strike action from 18 July.

The workers are striking, the union said, after facing two years of "substantial" pay cuts, with three quarters of the striking workers being security officers working for £11.50 an hour.

The workers said without a significant pay rise, recruitment and retention issues at the airport will worsen.

Last year, the workers received a pay rise of 2.8% when the real rate of inflation (RPI) was running at 13.8%. This year, they have been offered a 7.75% pay increase and a one-off payment of £850.

Unite general secretary Sharon Graham said: "Birmingham airport has returned to profitability but expects its low- paid workers to swallow a real terms pay cut after successive attacks on their wages and terms and conditions.

"This is completely unacceptable at a time of rising living costs. Unite’s laser-like focus on jobs, pay and conditions means these workers will receive the full unflinching support of their union as they strike for a fair pay rise."