GOL benefits for AA status members are applied inconsistently and seem to be trending worse over time. There are earlier reports on FT of people getting free checked bag (even though that wasn't an officially documented benefit), but that was not true in my experience in October 2023 at GIG. You also should not expect lounge access, at least when flying domestically. One of the documented benefits is free Conforto+ seats, but it isn't possible to select them online, and today when I called, the rep told me my fare class doesn't give me access to those seats. (This is a domestic flight booked as AA award.) I insisted, and after consulting a supervisor, he relented. Overall, I'm very underwhelmed by the GOL partnership.