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Stocks•15 April 2026•

1 min read

Scoot Leads 2025 Emissions Efficiency Rankings; Qatar Airways Among Top Global Performers

Two commercial airplanes, United and American Airlines, face each other over a golden world map with flight paths. A glowing light is between them.

Key Facts

1Singapore-based Scoot was named the world's most emissions-efficient airline in Cirium's 2025 EmeraldSky Annual Review.

2Qatar Airways, Ryanair, and Turkish Airlines were ranked as the top three most efficient global airlines based on available seat kilometres (ASK).

3The ranking is based on CO2 emissions per available seat kilometre (ASK) across the world's 100 largest airlines.

Singapore-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.