Which of the following is true of prisoners transported by Frontier?

The statement that prisoners may be restrained for the duration of the flight is true because regulations and security procedures are in place to ensure safety during transport. In an aviation context, it's critical to maintain control over individuals who could pose a threat to themselves, the crew, or other passengers. Restraining prisoners helps mitigate any risks associated with them being aboard an aircraft.

Physical restraints, such as handcuffs or leg shackles, are used by law enforcement agencies to prevent escape and manage behavior during the flight. These practices are part of standardized operating procedures when transporting individuals in custody.

It's important to understand that while restraints may be necessary, they are applied under strict guidelines to prioritize safety, human dignity, and compliance with legal requirements. The other options are not consistent with aviation security protocols, which require that safety measures, including the use of restraints when necessary, be implemented during the transport of prisoners.