Originally Posted by HLCinCOU

I did not take a test prior to leaving. The QR agent that I spoke to on the phone a few days before the trip said as long as I met the requirements for Greece the transit would not be a problem. Since I was fully vaccinated Greece didn't require a test, only the vaccine card.

On the other hand I did need to take a test to get back into the US. For that I brought with me a couple of the online-proctored Abbott tests. Did it in the hotel room, worked fine.