A big thumbs-up from the 100 passengers who flew on the United Airlines 737-8 from O’Hare International Airport in Chicago to Ronald Reagan Washington National Airport in Virginia on Dec. 1, 2021, with 100% SAF in one engine. (United Airlines photo) Sustainable Aviation Fuel Development is a Team Sport No one entity can decarbonize aviation alone, so Boeing provided technical support for SAF flights with two customers on board 737 MAXs and for Rolls-Royce’s 100% SAF flight with its 747 test bed. In December, several Boeing leaders boarded a United Airlines 737-8 in Chicago for the first-ever passenger flight on 100% SAF in one engine. They flew to Washington, D.C., on 500 gallons (1,900 liters) of 100% SAF in one engine and an equivalent volume of conventional jet fuel in the other. “United continues to lead from the front when it comes to climate change action,” United CEO Scott Kirby said on the day of the historic flight. “Today’s SAF flight is not only a significant milestone for efforts to decarbonize our industry, but when combined with the surge in commitments to produce and purchase alternative fuels, we’re demonstrating the scalable and impactful way companies can join together and play a role in addressing the biggest challenge of our lifetimes.” SAF advancements in aviation can happen on the ground as well. In late 2021, Boeing entered into a long-term partnership with the NASA Langley Research Center to test SAF emissions. The two aerospace pioneers joined forces to collect and analyze SAF emissions on the ground from the 2021 Boeing ecoDemonstrator, an Alaska Airlines 737-9. The testing included a flight with 100% SAF in one engine and conventional jet fuel in the other. The data collected thus far is consistent with the expectations of the benefits of the renewable fuel. Working with our industry partners, Boeing is conducting the research not only to make our commercial airplanes 100% SAF-capable, but also to better understand all aspects of SAF and how it will improve aviation sustainability. 2022 Sustainability Report 43 Contents People Introduction Communities Operations Reporting Approach & Governance Products & Services