Sirius Aviation AG has unveiled designs and images of hydrogen-powered VTOL aircraft known as Sirius Jets. These aircraft, developed in collaboration with BMW Designworks and Sauber Group, are intended for small-party air travel in private-jet and commercial variants. The project claims to offer a more efficient form of air travel with extremely low noise levels. The Sirius Jets, named Business Jet and Millenium Jet, accommodate three or five passengers respectively, emphasizing limited seating and luxury design. Notable for its use of hydrogen fuel, the Sirius Jet surpasses the range of fully electric VTOL aircraft, making it a unique project in the aviation industry. This development intersects with the growing demand for sustainable travel solutions amid concerns about environmental impact. While hydrogen fuel production currently relies heavily on natural gas, there is potential for green hydrogen to be utilized in hard-to-decarbonize sectors like aviation. Despite criticisms regarding the association of hydrogen production with dirty energy, Sirius Jet presents a more environmentally friendly alternative for luxury air travel. The Sierra Club recognizes the potential benefits of green hydrogen and its application in reducing carbon emissions in the aviation industry. Sirius Jet plans to make its VTOL aircraft available to the public in 2025, aiming to cater to the luxury air travel market with a focus on sustainability.