What must passengers do during taxi, take-off, and landing?

During taxi, take-off, and landing, passengers are required to remain seated with their seatbelts fastened. This safety protocol is in place to minimize the risk of injury during these critical phases of flight, which are essential for maintaining the structural integrity of the aircraft and ensuring passenger safety.

Keeping seatbelts fastened helps secure passengers in their seats, preventing them from being thrown about in the event of turbulence or sudden maneuvers that might occur during these operations. This requirement is mandated by aviation regulations and is a standard safety practice followed by airlines worldwide.

The other options such as being ready to use portable devices, standing in the aisles, or using the lavatory do not align with safety protocols. In fact, using portable devices is typically prohibited during these phases unless specifically allowed by the airline, standing in the aisles could pose a significant safety risk, and using the lavatory is discouraged for the same reason—ensuring that all passengers are properly secured and able to react quickly in case of an emergency.