When boarding an aircraft, passengers are often greeted by flight attendants at the door. While this interaction may appear to be simple courtesy, it serves several important purposes related to safety and security.
Flight attendants closely observe each passenger during the boarding process. They assess for signs of disruptive behavior, such as intoxication or aggression, which could threaten the safety of the flight. If a potential problem is identified before take-off, it is easier to address it on the ground rather than dealing with an incident in the air.
The number of disruptive passenger incidents has increased globally. For example, US airlines reported over 2,100 cases of unruly passengers in 2024. In Ireland, authorities recorded a significant rise from 426 to 1,432 incidents within a year. Switzerland also saw more than 1,700 cases during the same period. Agencies like the Federal Aviation Administration (FAA) have responded by issuing fines and holding passengers financially responsible for costs associated with flight diversions.