Technological roadmap: how to accelerate the path towards carbon-free aviation

What are the potential technologies that can make aviation sustainable and  environmentally friendly? Which ones are really promising? What research do we need to do and how can we speed up innovation? These fundamental questions on the path to carbon-free aviation are answered in a paper initiated by TU Braunschweig and TU Delft, bringing together a group of aviation and energy experts from renowned universities and research centres in Germany, France, the UK and the Netherlands.