you also have access to flagship lounges (noticeably enhanced food offerings compared to those in Admirals Club), check-ins, and exclusive pre-flight "fine" dining at select flagship lounges. basically a fancy term for first class in a three cabin flight. in my view, AA flagship is the gold standard right now in terms of seats and in/peri-flight services.

Edit: I'm referring to Flagship First here, but "flagship" encompasses both first and business classes as the above poster noted. No pre-flight dining for flagship business.