How is the term 'half-weight' defined in relation to children traveling by aircraft?

The term 'half-weight' in the context of children traveling by aircraft refers specifically to children aged 2 to 11 years old, whose weight is calculated as 85 lbs. for purposes of the flight manifest. This is important for airlines as it allows for a standardized method of calculating the overall weight and balance of the aircraft, which is crucial for safety. By designating this age group with a 'half-weight,' airlines can more easily manage seating and ensure that the aircraft remains within its operational limits. This definition acknowledges the significant variability in children's weights while providing a simplified approach to inflight operational procedures.

Other options do not accurately convey the established definition of 'half-weight.' For example, defining a child under 2 years old or a child who travels with a guardian does not pertain to the weight calculation for manifest purposes, and stating a flat weight of 50 lbs. disregards the age-specific classification that is crucial for flight safety regulations.