We flew from Nice to JFK. All anecdotal info, but hopefully helpful
- At Nice, we were questioned by the security just before the ticket counter. He looked at our COVID tests and asked if we had filled out the Delta Attestation
- At the check-in desk, they checked passports and gave out a boarding pass
- At security, they checked passports and boarding passes but no COVID paperwork
- At the gate security, they checked passports and boarding passes
When we got to JFK, we were high-tailing it off the plane to get to immigration. Part of the way there, we were stopped by three women in face shields and medical-looking suits. We were the very first ones off the plane. They wanted COVID tests and passports. They created an instant bottleneck for the hundreds of passengers behind us.
We then got to Global Entry kiosks - no lines, no documentation required and we were done…well except for the 6 hour flight to Seattle:)