I take immuno suppression medications, thus I am more susceptible to get something.
I use disinfectant wipes and wipe the armrest, table, handles, screen, etc ...
I wash my hands and disinfect them before eating, do the same after going to the toilet.
I wear a mask on flights longer than 3 hours, or if I have a sick looking neighbor on shorter ones. I use one from Vogmask
I fly business if possible, but it is always a compromise.
Touching wood, I never got really sick after a flight (caught some short lived fever or dry cough a few times though).