A debate is brewing over whether airlines should adopt weight-based pricing, charging passengers based on their weight to reduce fuel consumption and emissions. This discussion follows a broader trend of U.S. airlines implementing fees for checked baggage, which began in 2008 with American Airlines, and has since become standard practice. While Samoa Air's 2013 'fat tax' failed to gain traction, Finnair recently conducted a three-month voluntary data collection initiative, gathering passengers' weight along with their carry-on luggage. This anonymized data — including age, gender and travel class — will be used to refine aircraft balance and loading calculations from 2025...