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Flying business or first class roughly triples or quadruples your personal share of a flight's emissions compared to economy — you're taking up more physical space on the aircraft, so your portion of the total fuel burn is larger, even though the plane flies the same distance either way.
This is an illustrative estimate based on typical published aviation emission factors and average trip distances for each route type — actual emissions vary by aircraft, route, and how full the flight is. It's not intended for offsetting or compliance purposes.