This phase 1 feasibility study of a duration of 5 months was used to write a detailed business plan, conduct a market analysis and a survey of potential clients, conduct a more in-depth risk analysis of the human side of high-altitude flights, as well as achieve a preliminary design of an environmental control and life support system architecture. It shows three main markets to be addressed: a portion of the market of suborbital reusable vehicles, analog missions for astronaut training, and experiments and activities that can only be done using balloons (type of market, not formally the subject of any external study). Main expected customers are governments with no independent access to space, space agencies, aerospace companies who need to test devices, research institutes for experiments and educational entities.