I had benefits on three carriers at my precious regional. Then I got hired at AA.

AA flight benefits are the same as AA WO regional benefits, and I can say that the AA benefits are way better. The better priority is so much better than flying as AAC/S3C/SA5X.

There was the one time when the AA flight cancelled and I ZED my whole family on United coming out of Europe, and having the three benefits would have saved me a little bit of money. But the majority of the time, higher priority I have as a mainline employee is better for me.