Flying taxis could soon be a new way for travelers to get around busy cities. Joby Aviation (JOBY +0.87%) and Archer Aviation (ACHR -1.49%) are two leading electric vertical take-off and landing (eVTOL) companies that are getting close to obtaining approval for their respective aircraft and could soon be transporting passengers. Investors, however, may nonetheless be disappointed that it hasn't happened yet. Meanwhile, the companies continue to burn through cash. They are risky investments, but both possess ...