There are multiple factors here, for example flight loads. The people coming on to the plane of positive don’t really spend enough time around you to transmit- although your taught in biology at school And this can be true but rare, the reality is you need a number of virus particles to really increase your risk. Hence those who were face to face with you or within a distance of you for 15m are traced. On a plane generally the two rows in front and two behind along with your row are traced and told to isolate. That doesn’t mean there aren’t cases where someone outside those rows have contracted something, just that the risk reduces significantly. Once seated, if you look at the modelling, allbeit for sneezing, the majority of particles/droplets are channeled by the curvature of the cabin to the window seat.

Im summary, I’d agree with the above, the risk is low on a flight overall but if your worried about which seat, should you be flying. The safest seats are ones in rows furthest from others. Middle seat>aisle seat>window seat on a single aisle aircraft.

This is of course all theoretical. We simple don’t have enough data for real-world behaviour on aircraft for SARS2-CoV-2 and I’m sure there will be others who disagree with my interpretation.