The effects of the climate crisis needs to be addressed in order to safeguard our Planet and human life. For this purpose, the H2020 STRATOFLY project aims at developing a hypersonic hydrogen-fueled vehicle that will be able to fly antipodal routes without emitting carbon oxides. The reference vehicle is STRATOFLY MR3, which is powered by six Air-Turbo Rocket (ATR) engines and a single Dual-Mode Ramjet (DMR) engine. The ATR engines are operational from take-off up to Mach 4, after which they are gradually shut down while the DMR is activated to reach Mach 8. The cruise takes place at Mach 8 and at an altitude between 32 and 36 km.