With so many unknowns about covid, and how it's transmitted, or how long it remains active on surfaces, it sounds dicey. With a finite number of planes and the high number of travellers arriving @ places with the virus, you have to wonder if there are any planes left that aren't potential transmission transit tubes. So many places in those closed environments for covid to hide. I'm guessing the ability fully sterilize a jetliner has to be nearly impossible.