Currently you claim - that with your company - If you have the Flu - you are not permitted to fly. Is that true? I believe it, ie if you present with a fever etc then you may not be permitted to travel. BUT your company, does not, and have never asked, upon check in to show proof that the passenger has had a Flu Vaccination.
DO YOU SEE WHAT I AM SAYING.
Yes I know, what I'm saying is in the future I have no say in what direction they go in. They might require a vaccine passport, nothing I can do about that. France has mandated it for train travel, so the likelihood increases as other similar nations adopt it. How it would be practical or ethical or within human rights, I will have no say in that.