The San Francisco 49ers, in collaboration with United Airlines, have made history by announcing the use of Sustainable Aviation Fuel (SAF) for their charter flights, marking a significant step towards reducing emissions in the NFL. This initiative will see the 49ers cut their emissions by 85% on a lifecycle basis, setting a positive example for sustainable practices in sports. United Airlines' partnership with the 49ers, especially given its major presence in San Francisco, aligns well with the city's sustainability goals. While SAF presents an immediate reduction in emissions, the long-term focus is on Liquid Hydrogen Fuel as the ultimate solution for achieving net-zero emissions. Organizations like JetZero and Airbus are actively working on hydrogen storage and propulsion technologies, with Airbus aiming to test its ZEROe engine on an A380 testbed by 2026. The aviation industry is increasingly looking towards hydrogen as the future of clean aviation. United Airlines' commitment to sustainability is evident through its Eco-Skies Alliance program and significant purchases of SAF, surpassing other American carriers. The company's proactive approach sets it apart from competitors relying on carbon offset schemes. As the industry targets net-zero emissions by 2050, advancements in technology and operational efficiencies, alongside the adoption of alternative fuels like SAF and eventually Liquid Hydrogen Fuel, will play crucial roles in achieving these ambitious goals.