The aviation industry continues to make strides in reducing emissions, with the latest rankings from Cirium’s 2025 EmeraldSky Annual Review highlighting low-cost carriers as the most efficient in terms of carbon dioxide emissions per seat kilometer. Scoot, a Singapore-based airline, claimed the top spot, exemplifying how fleet choices and operational efficiency contribute to sustainability goals.
According to the report, airlines operating newer, more fuel-efficient fleets with high seat density outperform traditional carriers. Virgin Atlantic’s modern widebody fleet, including Airbus A350 aircraft, indicates a shift towards combining long-haul connectivity with improved fuel economy. The study emphasizes that fleet renewal and aircraft deployment strategies are crucial for airlines aiming to meet Net Zero commitments by 2050.
Key Findings and Industry Trends
The rankings show that regional and low-cost airlines dominate, with Scoot leading the list due to its modern fleet and operational practices. Other top-ranked airlines include Wizz Air of Hungary, TUI Airways from the UK, and Air Europa of Spain. The trend underscores the correlation between fleet age, aircraft capacity, and emissions efficiency, which benefits both environmental impact and airline economics.
Jeremy Bowen, CEO of Cirium, stated that decisions over fleet composition and how aircraft are used are within airline control, directly influencing emissions performance. Industry observers see this as a sign that environmental sustainability increasingly aligns with commercial viability, offering a competitive edge for early adopters of greener technology and practices.
Overall, the review underscores ongoing industry efforts to improve fuel efficiency and reduce carbon footprints, with the potential to influence future airline fleet strategies and environmental policies worldwide.
