I am flying tomorrow EWR to BUD with a Stop in Vienna VIA Austrian air. Went to the local clinic for a PCR, been told its too late for that, so they gave me a NAAT test instead and assured me its just as valid as a negative PCR. Can anyone verify that this is the case? everyone seems to talk about a PCR, so I am just not sure if a NAAT (Nucleic Acid Amplification Test) is really ok too. - TIA.