Are planes safe during COVID?

I have concerns with the opening story. While I don't doubt that so many did get infected, what I doubt is that they would've been showing symptoms from the illness so quickly. It usually takes a few days incubation period from contraction to start showing symptoms. I would speculate that the vast majority of these symptoms were psychosomatic. One person was indeed infected and showing symptoms, potentially suppressed temporarily by medication. Lack of circulation and filtration spread it to everyone with exception to those already immune or just lucky. However, the spread of the symptoms was likely a combination of allergy-related symptoms in some of the other passengers combined with psychosomatic projection. One person was sick; many thought they were going to get sick because of that person; some allergy sufferers were showing signs of illness due to the lack of circulation; further reinforcing the belief that they were going to get sick; so their bodies start reacting as if they are actually sick. Now this can have the benefit of putting our immune system on alert and respond faster to harmful invaders, but that's beside the point.