Cabin Space as Carbon Budget

View aircraft cabin layout and seat class allocation as an allocable carbon budget: premium seats consume disproportionately more emissions per passenger‑km, so regulating cabin space (fewer premium seats, higher occupancy, mandatory efficiency standards for aircraft) is a near‑term levers to reduce aviation emissions without cutting passenger journeys. — This reframes aviation climate policy from fuel‑supply fixes to demand‑side and distributional design choices that are fast, measurable, and politically tractable—shifting debates over offsets and SAF toward cabin‑design, pricing and airport performance standards.