What must the pilot in command ensure regarding passengers on a U.S. registered aircraft?

The pilot in command has a critical responsibility to ensure the safety of all individuals on board the aircraft, which includes conducting a thorough safety briefing for passengers. This briefing typically covers important safety procedures related to the operation of the aircraft, potential emergency situations, and the use of safety equipment such as seatbelts and emergency exits.

By briefing passengers on safety procedures, the pilot helps to prepare them for any issues that may arise during the flight, ensuring they understand how to respond effectively. This requirement is rooted in aviation safety regulations and best practices aimed at minimizing risks and enhancing overall safety for both passengers and crew alike.

In contrast, having passengers sign a safety form may not be a standard requirement across all situations, and while reminding passengers to stay hydrated is certainly good practice, it is not a regulatory responsibility of the pilot in command. Ensuring that passengers fasten their seatbelts is vital, but this is often covered as part of the safety briefing rather than being a standalone responsibility.