[frog in a pot]

The U.S. State Department...urging travelers to exercise increased caution.

What does "increased caution" look like on an international flight or any flight that lasts for > n hours? Not sharing breathed air with fellow travelers?

There must be a prudent risk calculation that is then compared to the rate of economic damage.

[jonatron]

" What does "increased caution" look like on an international flight or any flight that lasts for > n hours? Not sharing breathed air with fellow travelers?"

Apparently "right time" to hold breath is n hours.