i would not say that is an administration opinion or policy by any means at this stage. but it is a much more complicated task than employer-related requirements, because you need a system to efficiently and with privacy protected, have a way of verifying people's vaccination status. and from the beginning of the pandemic, there was pushback against vaccine credentialing or verification systems, which some have called are vaccine passports, because they are not, because these are not alternative forms of identification. but without a system like that that allows quick assessment of if somebody is vaccinated or not, those tsa lines could get a lot longer. and i don't think anyone wants to see that. >> while i was in england, i met a friend of mine from australia which is called their vaccine card, or passport, i showed him