Final answer:
The frequency of cabin checks by flight attendants varies, but checks typically occur between every 30 minutes to an hour for passenger safety and service purposes. Option 2 is correct.
Step-by-step explanation:
The frequency at which flight attendants (FAs) walk through the main cabin to check on passengers is not standardized across all airlines or flights and can vary based on many factors including airline policies, the length of the flight, and specific circumstances on the aircraft.
However, for safety and service reasons, it's common for FAs to make regular checks on passengers every 30 minutes to an hour. These checks ensure seatbelts are fastened during turbulence, address passenger needs, and check the general condition of the cabin.
Flight attendants are trained to continuously monitor passenger safety and comfort. While the exact timing of cabin checks isn't strictly set, FAs may increase the frequency of walkthroughs during longer flights, overnight flights, or when additional care is required. In some emergency or special situations, checks can be more frequent.