Can I use a BXP1 on a ticket purchased through Amextravel? Seeing a fare there ~$100 lower than from AA. I would think so (and I’ve confirmed the relevant inventory is available) but wanted to confirm.

Edit: To answer my phone question, the answer is yes, since I just got off the phone with AA to confirm the upgrade. While I got a good deal through Amextravel for whatever reason - ended up saving closer to $200, somehow - I am already hoping that I don't have to deal with trying to change it, lol.