Let's get away from vaccination points of view.
It was announced that vaccinated Europeans will be accepted in the USA "from November" (although all the journalists seem to have been allowed over there last week for the summit). When in November, and what procedures apply ? Show vax certificate ? Can we trust some additional regulation not to be snuck in, like "has to be certified". Any lateral flow test required before departure or on arrival ? When are the carriers taking bookings from ?