The US currently requires rapid test to enter the country, that applies to everyone including US citizens. The airline is delegated the task of verifying the paperwork You can verify US official websites. I flew in 4 days ago and that was the absolute requirement at departure. But when you get to the US nobody asks any questions, it's all done at departure.
Non c'è una regola statica, dipende dalla compagnia aerea. Quello con cui ho volato non richiedeva nulla
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