Under what condition must a law enforcement escort accompany a person in custody during a flight?

The correct answer is that at least two armed escorts are required. This requirement is based on the need to ensure the safety and security of all passengers and crew on the flight. The presence of multiple armed escorts helps to effectively manage the risks associated with transporting a person in custody, as it provides additional security and support to prevent any potential escape attempt or disturbance during the flight.

Having two escorts enhances the capability to control the situation by allowing one escort to maintain direct supervision over the individual in custody while the second escort can manage any other potential security concerns that might arise. This measure is particularly important in maintaining order and safety in the confined space of an aircraft.

The other conditions, such as relying solely on one escort or the effectiveness of handcuffs to negate the need for an escort, do not adequately address the complexities of managing a person in custody in a flight environment. Similarly, limiting escort requirements to only takeoff fails to consider the importance of security throughout the entire duration of the flight.