Delta just started this flight again last week. Although I was offered on-line check-in via email from Delta, it does not actually work - surely due to document check requirements.
We arrived really early for the 1pm departure. There was a long line for Main Cabin international check in - required if you’re checking luggage or even just doing carry on. We have Delta Medallion status so we got to skip it but there were easily 50 groups waiting in that line for Delta international flights.
Our line had only two groups ahead of us and it still took a good 15 minutes of waiting. Once up at the front, the Delta agent asked for our passports, our CDC vaccine cards and the French government’s attestation forms, which we were happy we had filled out in advance.
He then asked us for proof of COVID negative test and I pointed out that they aren’t required for us for France. He checked his screen, agreed, and gave us boarding passes.
Security was quick and totally normal.
We’re off! I’ll post any other really helpful transit details here if they come up.