Originally Posted by
platbrownguy
Technically if it's not AA Flagship First, EXP has access only on "Flights with seats ticketed as Flagship®" (see
https://www.aa.com/i18n/plan-travel/...t-check-in.jsp). That may in practice sometimes allow access when connecting to QR or IB... but it's not unreasonable to read the website as limiting access to those on AA-operated flights.
Flagship is an AA branding, no?

The IB flight doesn't have "Flagship" only "Business".