Interest in hypersonic airplane is constantly growing, both in civil applications and in military one. In this scenario, commercial air transport is very attracted by this emerging technology, since time to destination needs to be reduced with a number of passengers predicted to be higher than at present. In this context, the STRATOFLY project arose in a European landscape with the aim to study the feasibility of high-speed passenger stratospheric flight by means of futuristic airplane concept that shall be able to perform cruise at 30 km of altitude at Mach 8 flight speed and a reference Bruxelles-Sidney flight executed in less than 3 hours.