They've already been on a plane with hundreds of other people flying to the US. If they're contagious, it's way too late to avoid spreading the disease. (Whic

They've already been on a plane with hundreds of other people flying to the US. If they're contagious, it's way too late to avoid spreading the disease. (Which is not to say they shouldn't continue to quarantine themselves -- just that flying was foolish if they were concerned about being a vector for introducing the disease to the US.)