Flying to the US? The latest Attestation Form and advice on when / how to complete

Just to let you know that if you fly United, and to be fair you can do this for other US airlines you can complete your Attestation Form through the website of United / or the Check In kiosk at the Airport you are flying from to the USA. However I play safe and complete the Attestation Form before hand, print and bring to the airport and then I can show it to the check in clerk. Link to the Attestation Form is here- https://www.cdc.gov/quarantine/fr-proof-negative-test.html