My guess is that if this going to be a route that starts in winter, it'll be one or more of Cordoba (would almost certainly be from MIA), Cape Town (would probably be from either MIA or JFK), or Melbourne (likely from LAX). The mention of PR joining OW in this article is notable... so maybe AA will add LAX-MNL?
https://www.flightglobal.com/strateg...ter-doha-exit/