What’s your point? If actual spread on flights was the issue, thousands of air crew worldwide would have contracted the disease. This hasn’t happened.
The model going forward has to be getting the industry going again and having passengers return. A vaccine is a huge piece of this picture but not the only factor. Airlines and airport authorities have and are rapidly changing hygiene and risk factors. Rapid Testing technology is absolutely required, even with a vaccine. Far UVC light that kills virus on contact but does not harm humans will revolutionize our public spaces. Think hospitals, schools, theatres, airports, airplanes.
Aviation is on its knees. The global economy is dependent on it. Do you find really intelligent solutions to bring it back or keep digging up fairly dubious and pointless studies to prove a point that isn’t really relevant now anyway?