Some common sense advice here from Dr. Jonathan Finnoff, the Chief Medical Officer of the U.S. Olympic & Paralympic Committee.
WSJ wrote:
His first recommendation comes long before you board, during the finicky process of where to sit. He urges athletes to choose window seats in the middle of the aircraft, away from the most-trafficked areas—the front, where everyone enters, and the rear, near the galley and the lavatories.
“Very few people walk by you, and they’re not touching you and they’re not breathing on you,” Finnoff says.
Then, once the athletes are sitting comfortably, he recommends they use sanitizing wipes to clean any areas they might touch: the seat belt, arm rests, air nozzle. (He even says to wipe down the bathroom door.) But the most important target, he says, is the tray table. Research shows that it has a higher germ concentration than a toilet seat.
And, finally, to create a further barrier for germs, he suggests directing the air nozzle between you and the person next to you.