When Florian Reuter joined German drone taxi startup Volocopter in 2015 as CEO, co-founders Stephan Wolf and Alexander Zosel had impressive tech, but no clear path to market."When we started out there was not even an idea of how these types of vehicles would ever be certified," Reuter told Business Insider. "Now we have a whole new category created for us."Volocopter now has equity funding of €122 million and the company continues to add corporate strategic partners to a list that includes Daimler, Intel, and Micron.Now, the team is focused on completing its certification with the European aviation authority to become the first commercial air taxi company.This article is part of a series on growing a small business, called "From 1 to 100."If disruption is the path to a billion-dollar startup,