... CT scanner warns the operator of a potential hazardous object. CT scanners are slow compared to other types of baggage-scanning systems. Because of this, they are not used to check every bag. Instead, only bags that the computer flags as "suspicious" are checked. These flags are triggered by any anomaly that shows up in the reservation or check-in process. For example, if a person buys a one-way ticket and pays cash, this is considered atypical and could cause the computer to flag that person. When this happens, that person's checked bags are immediately sent through the CT scanner, which is usually located somewhere near the ticketing counter. A baggage-handling system makes all of the decisions about where a bag is going. Hundreds of computers keep track of the location of every bag, every traveller's itinerary and the schedules of all the planes. Computers control the conveyor junctions and switches in ...

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