Gulfstream Aerospace Corp. has become the first business aviation company to successfully complete a high-altitude flight test campaign demonstrating the potential for 100 percent neat sustainable aviation fuel (SAF) to reduce contrail-forming particle emissions at altitudes up to 50,000 feet.
The campaign marks the first 100 percent SAF flight for the Gulfstream G800 and Pearl 700 engine. The aircraft was paired with a specially modified Gulfstream G700, transformed into a flying emissions measurement laboratory. Operating in close formation, the aircraft enabled researchers to capture precise, real-world measurements of particulate matter and contrail-forming characteristics at altitudes typical for business aviation.
Conducted in collaboration with the FAA’s Center of Excellence (ASCENT), NASA, the German Aerospace Center (DLR), Rolls-Royce, and other partners, the campaign was designed to isolate how fuel composition influences non-CO2 emissions. The team compared conventional Jet A, low-sulfur Jet A, and neat HEFA SAF, which contains no sulfur or aromatics. Preliminary results suggest a significant reduction in particulate emissions that contribute to contrail formation when operating on neat SAF.
Mark Burns, President of Gulfstream, stated: “As aviation continues its work in optimizing environmental efficiencies, Gulfstream is focused on advancing solutions that deliver measurable impact today while shaping a more sustainable future for flight. This campaign reflects our strategy to lead with advanced technology, real-world testing, and meaningful collaboration.”
Delivering these results required months of preparation by Gulfstream’s engineering and flight test teams, including modifying the G700 cabin to integrate advanced in-flight emissions instrumentation. Pilots trained extensively to execute complex formation profiles needed to capture both near-field emissions and contrail evolution.
Rich Moore, Research Scientist at NASA, added: “This collaboration enabled these first-ever high-altitude 100 percent SAF emissions observations, allowing the team to operate safely while maintaining the precision needed for accurate data collection. This real-world data is essential to improving our models and understanding aviation’s broader environmental impact.”
The campaign provides valuable data that will help refine analytical models, inform future fuel standards, and support operational strategies to reduce aviation’s environmental impact. Julie Marks, Executive Director of the FAA’s Office of Environment and Energy, concluded: “Partnering with Gulfstream was an excellent opportunity that will help inform and quantify our efforts to mitigate the impacts of persistent contrails.”
