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Sign InSingapore-based Scoot has been named the world's most emissions-efficient airline in Cirium's 2025 EmeraldSky Annual Review, taking the top spot in the global rankings. Among the world's largest carriers, Qatar Airways, Ryanair, and Turkish Airlines secured the top three positions for operational efficiency based on available seat kilometres (ASK). The comprehensive study evaluates CO2 emissions per ASK across the 100 largest airlines globally to provide a standardized benchmark for sustainability. This report aims to drive transparency in the aviation industry's carbon footprint as environmental regulations tighten. Such positive ESG recognition is expected to bolster investor sentiment and potentially lower capital costs for the top-ranked airlines in the long term.