What is one of the functions of seatbelt extensions during a flight?

Seatbelt extensions serve a specific purpose in ensuring passenger safety and comfort during a flight. Their primary function is to accommodate passengers who may not fit comfortably in the standard seatbelt, which can be crucial for maintaining safety standards. By providing additional length, these extensions allow individuals to secure themselves properly, thus improving their protection in the event of turbulence or an emergency situation. Properly fitted seatbelts are essential for the effectiveness of safety measures in aviation, making it important to have extensions available for those who need them.

Other options do not accurately represent the function of seatbelt extensions. Adjusting cabin temperature, serving as flotation devices, or holding doors in place are unrelated tasks that do not pertain to the purpose of seatbelt extensions.