AA IT often gives us disorganized or confusing information.

In this instance, “Flagship” means three class First cabin and service. The only aircraft with three class First are the Boeing 777-323ER “77W” and the Airbus A321-200 transcontinental / A321T “32B” models. (Sometimes the First cabin on these are not sold as Flagship, such as when the A321T is sold JFK-BOS or SFO-LAX.)

The links in my previous post lead to AA pages about FF transcontinentally and internationally.

To add further confusion, AA also brands Business class on these flights as “Flagship Business” (link), offers Flagship Check-in, Flagship Lounges and Flagship First Dining with inconsistent requirements for access.

(At one time, aircraft were designated as “Flagship” - DC-3s were and had names like “Flagship Knoxville” and flew pennants from the cockpit window when parked on the ground - and the aircraft fleet was “the Flagship Fleet”.)