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Vietjet has achieved the lowest CO2 emissions per available seat kilometer (CO2/ASK) of 64.5 grams on Southeast Asia–based flights, according to the Flight Emissions Review 2025 released by Cirium on April 15. The result is determined using Cirium’s EmeraldSky methodology, with CO2/ASK as the key metric reflecting CO2 emissions per seat offered per kilometer flown. The report shows Vietjet at 64.5 g CO2/ASK, followed by Singapore Airlines at 66.7 g and Lion Air at 67.1 g. It also notes that carriers with younger fleets and higher seat density continue to lead the market. The regional emissions ranking covers flights in Southeast Asia, where short- to medium-haul routes make fuel optimization particularly challenging. Maintaining the lowest emissions demonstrates the carrier’s operational optimization across the entire value chain, from aircraft configurations and network planning to payload management. The airline currently operates mainly Airbus A320 and A321 family aircraft, including NEO versions that save roughly 15–20% in fuel compared with the previous generation. With one of the region’s youngest fleets, Vietjet significantly optimizes fuel burn and CO2 emissions per flight. In parallel with fleet investments, the airline also leverages technology in operations, from flight-data analytics platforms such as SkyBreathe to fuel-optimization programs like SFCO2, thereby improving efficiency across the system. Vietjet aircraft. Photo: Tai Nguyen Earlier, Vietjet was named in AirlineRatings’ Top 7 most sustainable airlines globally in 2025 for outstanding efforts in reducing emissions, fuel efficiency, and green aviation. The airline has also been recognized for ESG achievements in markets such as Taiwan. Flight Emissions Review is Cirium’s annual ranking of the world’s 100 largest airlines based on actual operating data, allowing comparison of emissions across carriers by scale and geography and providing a transparent benchmark for the industry.
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