If I recall there’s a special exemption in the HIPAA laws for pandemics which carves out a limited release of info to authorities if you’re infected by a contagion.
Don’t know if that applies to vaccines or not but there might be a corollary to that.
I see big biz in CDC fake vac cards...
Of course infection should be a concern on common carriers; I’m not opposing that. But the new precedent set with this new scamdemic is that the UNinfected are now the suspects, much more so than those diagnosed.
HIPAA can be broken in certain snd very specific situations as in the duty to disclose harm or threat to others. The government can enact emergency health measures to stop disease spread (forced quarantine for example) but this applies to active disease
There is nothing that compels someone to disclose vaccination status. However a private company can require whatever standard or want to employ or provide service so long as it does not violate specific protected individuals (title IX?). So I suppose that an airline as a private entity can require to prove or declare vaccination status. It’s the price of freedom and private companies.