Joby aviation seems the furthest along. Joby has completed many test flights that mimic its real-world route distances and energy-altitude flight regeimes. It

Joby aviation seems the furthest along. Joby has completed many test flights that mimic its real-world route distances and energy-altitude flight regeimes. Its flight avionics package (essential for VTOL fly-by-wire) has received FAA certification. Related to Lilium and noise, Joby has a lower overall emitted dB energy and, specifically, a much lower dB signature in the human hearing range.