Inventing the aviation of tomorrow is a unique occasion to adopt green innovations, but also to think about the mobility of tomorrow differently, both over long and short distances. Urban air mobility is a whole new aspect of air transport that offers new opportunities to aviation stakeholders. It is also an opportunity to build green an entire sub-sector, building upon the lessons learned over decades by aviation. Electric vertical take-off and landing (e-VTOL) aircraft technologies are currently being developed and experimented. However, challenges such as ground infrastructure, economical costs or energy density of batteries would need to be overcome to make it a viable sub-sector.