Thanks for telling me to look further! I just read "international" (Get access if you’re traveling in First or Business on a qualifying same-day international) and got excited - too early as it turns out........
I googled around further and found this:
Qualifying international
Flights with seats ticketed as Flagship® between the U.S. and:
Asia
Australia
Europe
Middle East
New Zealand
South America (excluding Bolivia, Colombia, Ecuador, Guyana, Peru, Suriname and Venezuela)