The aviation industry faces the challenge of decarbonization, with air traffic contributing significantly to global CO2 emissions. In Switzerland, Cellsius, a team of young engineers, is making strides in sustainable aviation. Their first project, the e-Sling, was a successful all-electric four-seater airplane designed by students. Following this success, Cellsius embarked on the H2 project to develop an aircraft powered by hydrogen fuel cells for longer flight durations and ranges. Kistler's technology, including torque sensors, plays a crucial role in these projects by enabling the development and optimization of electric motors, power electronics, and fuel cell systems. The Swiss Innovation Park in Dübendorf provides support for these initiatives, offering space for laboratories, workshops, and offices. The H2 project involves equipping a Swiss Light Wing AC4 with a hydrogen fuel cell system, with components like pressure and temperature sensors from Kistler installed in the prototype. The project also focuses on developing power electronics and systems to control energy transmission within the aircraft. Through these innovations, Cellsius and its partners are working towards sustainable aviation solutions, demonstrating the feasibility of decarbonization in the aviation industry.