What must be available to all passengers on an aircraft?

Passengers on an aircraft must have access to safety briefing cards. These cards are an essential safety tool that provide important information regarding the aircraft's safety features, emergency procedures, and instructions on the use of emergency equipment. The information presented is crucial for passenger awareness and preparedness in the event of an emergency. This accessibility helps ensure that every passenger can understand the safety measures in place and what actions they should take during a critical situation.

Flight certificates, passenger manifests, and weather briefing reports, while important for the operation of the flight and compliance with regulatory requirements, are not typically made available to passengers. These documents serve specific functions within airline operations and are not designed for passenger use or understanding, hence they do not contribute directly to passenger safety awareness like safety briefing cards do.