First Hybrid-Electric Flight Above 30,000 Feet Completed: Two Hours That Rewrite Aviation History

During the Farnborough International Airshow 2026, GE Aerospace announced the completion of the world's first flight of a hybrid-electric aircraft at altitudes above 30,000 feet, which are typical heights for commercial airliners. The test, conducted in collaboration with NASA, BETA Technologies, and Boeing, marks a significant milestone in the journey towards partial electrification of aviation propulsion.

The experiment took place on a modified Saab 340B, which had a megawatt-class hybrid-electric propulsion system installed on its right side, developed under NASA's Electrified Powertrain Flight Demonstration (EPFD) program. Unlike fully electric aircraft, hybrid propulsion combines a traditional gas turbine engine with an electric powertrain, allowing power to be distributed between the two sources depending on the flight phase, aiming to improve efficiency without compromising the performance required in commercial contexts.

The experimental propulsion package was housed in an inverted engine nacelle, a solution that provided better cooling for high-power electrical equipment during flight. The system integrates electric motors/generators, converters and inverters, controllers, Avio Aero reducers, Dowty propellers, Unison heat exchangers, torque sensors, and engine wiring, all paired with a CT7 turboprop. The batteries were supplied by BAE Systems, while the complete nacelle was designed by Aurora Flight Sciences, a Boeing subsidiary.

During the longest test segment, the system operated in hybrid-electric mode for over two consecutive hours. Throughout the campaign, the electric powertrain both powered the propeller and generated energy to recharge the onboard battery.

The flight tests were conducted by pilots from GE Aerospace and BETA Technologies, the latter serving as system integrator, first in the United States and later during the transatlantic flight that brought the aircraft to the UK for the airshow. The Saab 340B operated in hybrid-electric mode throughout the entire crossing.

Compared to ground electric vehicles, electrification in flight presents different challenges: thermal management, lower atmospheric pressure at high altitudes, and the need for lightweight electrical components that are certified to higher safety and reliability standards than conventional test hardware.

H. Lawrence Culp Jr., Chairman and CEO of GE Aerospace, called the flight "a historic moment for the industry," thanking NASA, BETA Technologies, and Boeing for their collaboration in accelerating the development of technologies focused on efficiency, durability, and autonomy. Kyle Clark, founder and CEO of BETA Technologies, highlighted how the system improved performance in climbs and at high altitudes, calling the aircraft a true "flying laboratory" for future hybrid projects.