What must be ensured about prisoners allowed on board?

The requirement that prisoners on board should not pose a risk to other passengers is critical for ensuring the safety and security of everyone on the flight. This means that if a prisoner is allowed to be transported, appropriate assessments must be made to ensure that their presence does not endanger other passengers or crew members. It involves evaluating their behavior, mental state, and any potential for causing disruption.

Keeping prisoners separate from other passengers is also a common practice for security reasons, but the primary focus is on assessing the risk they may present. The notion that prisoners can be released during the flight is impractical and hazardous, and the idea that they must not interact with the cabin crew is not typically a standard requirement, as there may be necessary communication related to management and care during the flight. Thus, ensuring that prisoners do not pose a risk is the most crucial aspect of this scenario.