Welcome aboard CC
The JetAway app has limited info. The definitive place for NRSA information is JetNet.
AA’s boarding is based on check-in time within each pass classification. As a registered Companion (RC) you travel as a D2.
The pass classifications
D1
D2
D2R
D2P
D3
There are a few more classifications but I’ll just stop here
Note that a connecting “Through” pax (D2T) has a higher boarding priority that a “locally” boarding D2.