Some additional information: My son and I submitted our documents today for our return trip to the US. (We transit through Frankfurt and Toronto) His came back saying he needed to complete an ArriveCAN submission, mine came back saying I needed to submit the US CDC declaration form. This is truly odd for a number of reasons:
1) We have the same itinerary and booking code, and uploaded the same docs, yet received different responses.
2) My understanding is that as we are transit passengers not entering Canada, we do have to complete/submit ArriveCAN.
3) The link to the CDC declaration form provided by Lufthansa is not a fillable PDF and it has no place to print your name. I found a fillable PDF version of the form elsewhere: https://www.cdc.gov/quarantine/pdf/Fillable-Attestation-English-p.pdf
We both completed our CDC attestation form and re-submitted our documentation on the Lufthansa upload site.
This consisted of:
Our CDC proof of vaccination
Our negative COVID test for entry into the US
Our US passport, and
The CDC declaration form.
After this second submission, my son’s came back and said he still needed to submit an ArriveCAN form. Mine can back as all documents accepted.
Again, this is truly bizarre that we have the same itinerary and submitted the same documents, but received two different responses.
At this point, we just need to get to the airport a bit earlier and check in at the counter. Not a big deal, but a bit of a pain since the document upload process seems “glitchy”