You can certainly reduce risks of transmission.
Right now it is a case of taking care of various factors as well as we can as individuals, as well as being responsible citizens.
a) Assume the person previously in the seat was C19 positive and shedding (they >99% likely weren't but you need to be prepared to overcome that risk),
b) Assume the person sat nearest you is C19 positive ... do not sit next to someone without a mask (most airlines are now requiring we all wear masks - collectively these massively help reduce transmission)
c) Keep from touching surfaces as much as possible ... especially higher traffic and higher risk surfaces (think and learn which they are)
d) Keep from touching face, nose, mouth, eyes .... keeping hands regularly clean helps keep this transmission possibility lower
e) Avoid small talk with passengers, especially if facing one another and especially if masks set aside
f) Keep regularly cleaning hands, mobile fone, laptops, glasses
g) Minimize all higher risk contact from leaving home to final arrival. This includes distancing wherever possible, avoiding proximity to people without masks, not touching higher risk surfaces, cleaning hands.
h) Think very carefully how and when you eat or drink.

Personally, I would also 'clean' frequent touch areas and tray tables, remotes etc when I take my plane seat.
I'm sure to be missing somethings practicable and proportionate in the list above ... so always be on the lookout for new learning and good tips.