United first to fly aircraft full of passengers using 100% SAF

United has operated a flight that will serve as a turning point in the industry’s effort to combat climate change.

For the first time in aviation history, a commercial carrier flew an aircraft full of passengers using 100% sustainable aviation fuel (SAF).

US carrier United has also announced the second round of corporate participants in the airline’s Eco-Skies AllianceSM program to collectively contribute towards the purchase of SAF.

United, a leader in the use and support for the development of SAF, an alternative fuel made with non-petroleum feedstocks, already has agreements to purchase nearly twice as much SAF as the known agreements of all other global airlines combined.

SAF has the potential to deliver the performance of petroleum-based jet fuel but with a fraction of its carbon footprint.

According to the US Department of Energy, the country’s vast feedstock resources are enough to meet the projected fuel demand of the entire US aviation industry.

“United continues to lead from the front when it comes to climate change action,” said United CEO Scott Kirby, who added: “The 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.”

The demonstration flight – which departed with more than 100 passengers from Chicago’s O’Hare International Airport and landed at Washington DC’s Reagan National Airport – was on a new United Boeing 737 MAX 8.

The flight used 500 gallons of SAF in one engine and the same amount of conventional jet fuel in the other engine to further prove there are no operational differences between the two and to set the stage for more scalable uses of SAF by all airlines in the future.

Currently, airlines are permitted only to use a maximum of 50% SAF on board. The SAF used on the flight was drop-in ready and compatible with existing aircraft fleets.

United operated the flight in partnership with Boeing, CFM International, Virent – a subsidiary of Marathon – whose technology enables 100% drop-in SAF, and World Energy – the world’s first and North America’s only commercial SAF producer.

“Boeing is proud to support United on this historic event as we work together to make aviation more sustainable,” said Ihssane Mounir, Senior Vice President of Sales and Marketing for The Boeing Company.

“As an industry, we are committed to addressing climate change, and sustainable aviation fuels are the most measurable solution to reduce aviation carbon emissions in the coming decades.

“No one entity can decarbonize aviation alone and it will require partnerships like this to ensure aviation is safe and sustainable for future generations.”

Said Gaël Méheust, president & CEO of CFM International: “Drop-in SAF is something our industry can adopt now to begin making inroads on our commitment to be net zero carbon emissions by 2050. ”

Said Dave Kettner, president and general counsel of Virent: “Virent’s proprietary technology demonstrates that SAF can be 100% renewable and 100% compatible with our current aviation fleet and infrastructure. We are proud to be playing a role in this advancement toward sustainable aviation fuels.”

Said Gene Gebolys, CEO of World Energy: “When we fly, we connect, and our demand for the connections aviation makes possible are only going to grow.

“But we need to develop affordable, high-energy density, low-carbon liquid fuels at scale everywhere to allow those connections to be made sustainably. The pioneering work is the hardest work, and United has been with us from the very start.”

United’s Eco-Skies Alliance program was launched in April 2021 and now has collectively contributed toward the purchase of more than 7m gallons of SAF this year alone.

With its nearly 80% greenhouse gas (GHG) emissions reductions on a lifecycle basis compared to conventional jet fuel, this is enough SAF to eliminate approximately 66,000 metric tons of GHG emissions, or enough to fly passengers more than 460m miles.

Including newly announced participants, the Eco-Skies AllianceSM program has nearly 30 participants, including DHL Global Forwarding, Bolloré Logistics, Maersk, Yusen Logistics HP Inc and Nike.

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