What procedure is followed if a passenger refuses a security screening?

When a passenger refuses a security screening, the appropriate procedure involves denying them boarding or escalating the situation according to established regulations. Security screenings are a critical part of the airport protocol designed to ensure the safety of passengers, crew, and the aircraft itself. By refusing to undergo the screening process, a passenger poses a potential security threat, which cannot be overlooked.

As a result, the regulations are clear: passengers who refuse screening are typically not allowed to board the aircraft. This is essential in maintaining the integrity of the security process, as every individual must comply with the screening to ensure collective safety. Escalating the situation may involve notifying higher authorities or following specific procedures outlined in the airline's security protocol to address the refusal, ensuring that all potential risks are adequately managed.

The other options do not align with standard safety practices in aviation security. Allowing a passenger to board without screening contradicts the very purpose of security protocols, while imposing a fine or delaying the flight creates complications that do not effectively address the security risk presented by a refusal to be screened. Therefore, the selected procedure is crucial for maintaining safety standards in air travel.