Originally Posted by
friedablass
I'm certainly not one to try finding out, but I highly doubt they have the authority to bar a US citizen from entry. I think the most they can do is penalize the airline for not checking before departure.
It is possible that the airline DID check the documentation, but the passenger didn't think he needed to save that document after it was checked.
PS: That one can cross into the USA via a LAND crossing (without a negative COVID test), but has to be tested when arriving by air, makes the whole "system" not creditable.
