Finally arrived at our first stopover on the way to Athens. We were concerned that with the various paperwork submissions something might be missing. At our departure in Chicago the Lufthansa agent checked us in and electronically everything was okay so they issued a boarding pass for us.
At border control in Germany, the officer just looked at our passports and vaccination cards. He had a big laugh when he saw our three vaccination jabs. A laugh is good. Now awaiting the next leg.