Regarding the latest Houston area case (the 20 yo woman)...I found this interesting...
...Harris County officials called for the isolation of passengers who sat in the business/first class section of a Lufthansa (LH309) flight from Florence to Frankfurt March 3 (10:05 a.m.-11:45 a.m.); and in the business/first class section of a United Airlines (UA47) flight from Frankfurt to Houston the same day (1:50 p.m.-6:10 p.m.). Other passengers do not need to isolate themselves.....
The cheap seat passengers stumble up the aisle through first class to enter and leave the plane and touch first class seats. They all breathed the same air and then there’s the attendants.
SMH