Due to the economic downturn, the airline industry has been faced with lower passenger numbers, increased operating costs and the imperative of cost-cutting. Security policy is not immune from these challenges. The deployment of security personnel, for example, appears to be a difficult puzzle. The number of passengers checked at the various terminals varies from one moment to another. Each day there are three major peak times. G4S has to match its staff planning to those peaks Two issues needed a solution: queues could not be allowed to get too long, and unproductive working hours outside the peak periods needed to be avoided.