[tet68]

Claims he did not get sick for 4 days after returning, so nobody on the flight was exposed.

My take on it would be that either everyone on that flight
was potentially exposed by him or he was exposed to someone
on that flight...

I’m thinking they are quickly getting in touch with
everyone who was on board.

[Chgogal]

Excellent analysis. I hadn't thought of that. We shall know soon.

[huldah1776]

No they are not tracking the people on the plane.