I am looking at a BA (AA codesare) flight from Bologna, Italy. BLQ to Heathrow, 3 hours then AA to Charlotte NC. This would be on September 18. It appears that as of today a Covid test result must be presented even when transit through. I have been vaccinated but so far no mention there even passengers in transit are not subject to this. Things could change by September 18 or not.
Can anyone clarify this for me?