Keep in mind that within 1 hour of his plane landing... it was full of passengers again taking a several hours long flight.

Someone was sitting in the same chair he used... or is sitting in the chair behind or next to it. Someone used the same tray table he used, or used the same arm rest he did. The ventilation system of the airplane is still circulating the same air exhaled by the former passengers.

That plane is a giant petri dish of viruses and germs... and people sat in it for the next few hours after HE got off the plane.

Moral of the story: Don't be that guy.