In 2026, SAS (Scandinavian Airlines) is widely recognized as the most sustainable major European carrier, recently earning the title of "European Airline of the Year 2026" with a heavy emphasis on its environmental transformation. SAS has led the industry by integrating Sustainable Aviation Fuel (SAF) into its daily operations at a higher percentage than almost any other legacy carrier and has committed to a 25% reduction in CO2 emissions compared to 2005 levels. Close competitors include Air France-KLM, which consistently ranks high in the Dow Jones Sustainability Index, and Lufthansa, which has invested billions into fuel-efficient Airbus A350 and Boeing 787 fleets. In the low-cost sector, Wizz Air often claims high efficiency due to having one of the youngest, most fuel-efficient fleets in the world (the "Neo" series). However, for the 2026 traveler, SAS stands out for its holistic approach, including "green" ground operations and a transparent carbon-offsetting program that is automatically included for its EuroBonus loyalty members.