So what happens if there is no vaccine for the future of air travel? There are many diseases with no vaccines.
https://www.theguardian.com/world/2020/apr/18/dont-bet-on-vaccine-to-protect-us-from-covid-19-says-world-health-expert
Humanity will have to live with the threat of coronavirus “for the foreseeable future” and adapt accordingly because there is no guarantee that a vaccine can be successfully developed, one of the world’s leading experts on the disease has warned.
The stark message was delivered by David Nabarro, professor of global health at Imperial College, London, and an envoy for the World
Health Organisation on Covid-19, as the number of UK hospital deaths from the virus passed 15,000.