Ok, one PNR on original booking and your friend has no status, most likely when reservation was split, did they asked for his email address to send his confirmation details?, if not, then "new" booking may have gone to your email address as well as it was still linked to the original booking info. This is key. Look for this info, and then go back to AA and fight it out. FYI, the same issue can occur with any carrier, the key is to check on the confirmation email afterwards, which you did not, this could have saved time and money.