Originally Posted by
littlefish
I'd suppose the objective is to minimise transmission risk once on the plane. Your fellow passengers and crew are set by then.
#1 probably has some marginal benefit ... but any droplets emitted from an infected traveler walking back will simply land on the arm rest rather than the arm/face.
They may land on people anyway. Blow a lot of bubbles and see what can happen to them.
That said, the greater risk is probably from being close to a person with a high viral load or from the virus being on surfaces which a passenger may physically contact.