In Gruyère, Switzerland, celebrated Swiss pilots Laurent Sciboz and Nicolas Tièche took flight in a hydrogen balloon powered by 'green hydrogen' generated solely from solar energy. This innovative feat not only secured a place in the 2019 Coupe Aéronautique Gordon Bennett but also symbolized a crucial step towards sustainable aviation practices. By utilizing solar panels to produce hydrogen through electrolysis on-site, the partnership between Gruyère Hydrogen Power and GRZ Technologies exemplified the potential for decarbonizing balloon flights and expanding into other aerial activities. The article delves into the historical timeline of solar-powered flights, from the AstroFlight Sunrise in the 1970s to recent milestones like the Airbus Zephyr Programme's endurance record. Furthermore, it emphasizes the growing trend of utilizing renewable resources like solar and wind power in ballooning, as seen in the recent FAI Coupe Aéronautique Gordon Bennett in Germany. The article also acknowledges the groundbreaking achievements of Solar Impulse and other solar-powered projects, underlining the transformative impact of sustainable energy in the aviation sector. Overall, the solar-generated hydrogen balloon flight in Switzerland highlights the ongoing shift towards greener aviation practices and offers a glimpse into a more sustainable future for air travel.