I would say you should have no worries traveling on AA with a diabled person and no status. I have first-hand experience traveling on AA with a disabled person from the mid-west to Caymen Islands (2 plane changes no less). AA was incredibly accomodating - early boarding, patiently waiting for us to deplane, having the personal wheel chair brought up form the belly of the plane to make connections, etc. A warm smile, and hearty thank you to the AA staff produced friendly and extra efforts from crews and ground staff.