For whom can the extension seatbelts be used?

The use of extension seatbelts is primarily intended for infants and oversize passengers. Infants may need additional support for safety purposes, especially when being held by an adult. In addition, oversize passengers may find standard seatbelts restrictive; thus, extension seatbelts provide a more comfortable and safe fit. This ensures that all passengers are secured appropriately during the flight, adhering to safety regulations and accommodating different body types.

Other demographics or categories, such as only adult passengers or those seated in first class, do not have the same requirement for extension seatbelts, which is why the correct answer encompasses both infants and oversize passengers.