Agreed that air travel would seem to be high-risk given airborn transmission.... but why aren't we seeing it? Seems like the easiest transmission to trace -- someone takes a plane, tests positive, contact everyone who was on the same plane. But I haven't seen a documented case over the last five months of "one person a plane infects 20 others..."

It confounds my mental model of how this virus is spread. Any idea what's going on there?