It is indeed good to see AA return to the Caribbean market. Regional jets can make the difference.
Wasn’t AA's attempt in the early 2000s predicated on a hub in SJU and utilizing ATR 42 and 72 equipment? AA also received subsidies and incentives from some governments, and when the economics didn’t pan out AA pulled out.

The ATRs didn’t have a good safety record either. Per Wikipedia: “The ATR 72 has been involved in 66 aviation accidents and incidents, including 40 hull losses, resulting in 470 fatalities”

The long history of Caribbean air travel has been a challenge. Regional jets by majors can help, but economics and supply and demand will continue to rule