This is a repost from Travel Tips since it didn't show in the current discussion list.
There have been several discussions here about Tauck and various country requirements wrt covid. Most of us are tracking them and trying hard to keep up with changes. Some though aren't. (Fyi, I have a good friend traveling to Ireland next month who didn't know she had to have a neg test to get on her flight home.) It got me to wondering how much guest protection coverage you'd have If you got to your U.S. flight departure point ( jfk, atl, etc) and weren't allowed to board because the airline had checked and you didn't have the requirements met.
I kind of doubt any of us know the answer for sure but it's an interesting thought.