How can flight attendants ensure compliance with weight and balance requirements for flights?

The correct approach for flight attendants to ensure compliance with weight and balance requirements for flights is through the verification of passenger counts and luggage loads before takeoff. This process is critical because achieving the proper weight distribution directly impacts the safety and performance of the aircraft during flight.

Accurate assessment of passenger numbers and their baggage ensures that the aircraft operates within its weight limits, which is essential for stability and control. If the weight is improperly distributed or exceeds the limits, it could lead to potential safety hazards, such as difficulty in takeoff or landing.

While the other options involve methods of assessing or adjusting weight, they do not provide the same level of reliability or safety. Estimating weight based on previous flights lacks the precision needed for current regulations and unique flight conditions. Checking with mechanics could provide information on load adjustments, but flight attendants are typically the first line responsible for the weight and balance before takeoff. Focusing solely on passenger counts ignores the crucial aspect of luggage, which can significantly affect overall weight. Thus, verifying both passenger counts and luggage loads ensures comprehensive adherence to weight and balance safety measures.