What is Piggybacking in the context of airport security?

In the context of airport security, piggybacking refers specifically to the act of an unauthorized individual following closely behind an authorized person in order to gain access to secure areas without proper credentials. This situation creates a serious security risk, as it can lead to unauthorized individuals entering restricted zones where security protocols are strictly enforced. By exploiting the trust and security that comes with an authorized individual, piggybackers can bypass checkpoints and other safeguards designed to ensure safety within the airport environment.

Each of the other options mentions scenarios that, while related to airport operations, do not capture the essence of piggybacking. The technique for legitimate entry would imply that the individual has proper authorization, which is not the case in piggybacking. Cargo loading and expedited screening methods refer to operational aspects rather than security vulnerabilities. Thus, the focus on unauthorized entry through following an authorized person defines piggybacking accurately in airport security contexts.