What actions are taken if a passenger triggers a security alarm?

When a passenger triggers a security alarm, they may be subjected to additional screening by security personnel. This action is part of standard security protocols that aim to ensure the safety of all passengers and crew. Additional screening may include further checks such as manual inspection of bags, body scans, or questioning the passenger to clarify the situation.

This process is critical to ascertain whether the alarm was triggered by a legitimate security concern or if it was a false alarm. Ensuring thorough investigation without immediately denying boarding or halting operations is essential in maintaining a balance between security and passenger convenience. The other options do not align with standard procedures as they may lead to unnecessary delays or problems without first determining the nature of the alarm. For instance, automatically denying boarding or requiring immediate exit from the airport could escalate the situation unnecessarily before assessing the reason for the alarm. Similarly, postponing the flight would not be warranted until it is clear that there is a significant security threat.