GE Aerospace, NASA, BETA Technologies, and Boeing achieved the first hybrid electric flight above 30,000 feet, matching commercial aircraft altitudes.
The flight test, part of NASA's EPFD project, used a modified Saab 340B with a megawatt-class hybrid electric propulsion system.
Hybrid electric systems combine electric powertrains with gas turbines for improved efficiency and fuel flexibility, targeting over 20% better fuel burn.
Public demonstrations are planned at the Farnborough International Airshow, showcasing the aircraft in flight and static displays.
Previous milestones include ground tests in 2016, altitude tests in 2022, and system integration achievements by 2026.