ZeroAvia has been invited to join the UK Civil Aviation Authority's Hydrogen Sandbox Challenge, which aims to prepare the aerospace industry for the adoption of hydrogen as a zero-carbon aviation fuel. The company will be working with the CAA to explore safety and regulatory requirements for the commercial adoption of hydrogen, particularly focusing on certifying its ZA600 hydrogen-electric powertrain for up to 20 seat aircraft. ZeroAvia's participation in the program includes investigating safe hydrogen fuel storage, distribution, and refueling practices. The next stage of the Hydrogen Challenge will involve developing new aircraft designs using hydrogen fuel cell power systems to reduce carbon emissions, as well as conducting flight trials, safety assessments, and demos. ZeroAvia's positive experiences in the first round of the challenge have motivated them to continue towards achieving zero-emission flights using hydrogen technology. The company has also received regulatory approval from the FAA in the US for its electric propulsion system. ZeroAvia has conducted extensive testing of its hydrogen-electric engine aboard a Dornier 228 aircraft and is aiming to certify the Cessna Grand Caravan as the launch airframe for its ZA600 powertrain. Additionally, the company has performed advanced ground tests for the ZA2000 system, which will support larger regional turboprop aircraft. ZeroAvia's efforts in hydrogen technology showcase their commitment to sustainability and innovation in the aviation industry.