A history lesson about the Influenza of 1918:
https://anon.to/40IvW9
Nothing is stopping airlines from:
- Creating a policy or adjustment to the contract of carriage forbidding anyone who is sick of anything from traveling.
- Providing Clorox wipes to everyone all the time, not just for COV-19.
- [added] Allowing any airline employee for calling out sick without fear or reprisal (as is the case now). Current airline policies, particularly BJ's use of PTO, dependability policy encourage sick people being at work.