The UK is looking to use alternative, sustainable fuels for its combat aircraft and helicopters in a bid to lower carbon emissions.

German startup Lilium has partnered with Lufthansa Flight Training to develop a pilot sourcing and training program that will support its planned global deployment of regional air mobility services.

U.S. start-up Ampaire is flying its hybrid-electric testbed on a regional airline route in Hawaii to demonstrate the propulsion technology’s potential to reduce fuel burn and CO2 emissions by 40-50%.

Germany’s Volocopter has committed to launching air taxi service in Singapore within three years using its piloted two-seat VoloCity all-electric vertical-takeoff-and-landing vehicle.

Signature Flight Support has pumped the first ceremonial gallons of sustainable aviation fuel (SAF) at the first two locations in its network, marking the launch of the renewable fuel’s continuous availability for purchase.

While engineers at airframers and engine manufacturers, particularly in Europe, are busy advancing hydrogen technology for use in commercial aircraft propulsion, airports have begun studying a transition from conventional fuel.

Chinese electric air taxi developer EHang is adapting its business model to become an operator as well as the manufacturer of its autonomous air vehicles.

Airbus has carried out a new flight test program of its Zephyr solar-powered pseudo-satellite, focusing on low-altitude flying, ascent and descent.