The arbitrator can make any award that is equitable. She can order the losing party to pay additional costs, including AAA filing fees and arbitrator fees. Legal fees may be awarded if the arbitration clause so provides. See page 279 for an example Award of Arbitrator. If the parties settle their dispute prior to a decision, they may request that the terms of the settlement be embodied in the consent award.
Arbitrators have no contact with the parties after the hearing is concluded.
The parties are notified in writing by the AAA administrator and are sent a copy of the award. It is practically impossible to appeal a losing case. The arbitrator has no power once the case is decided. The matter can be reviewed only by a judge, and judges cannot overturn the award on the grounds of insufficient evidence. Since the arbitrator's award is final and binding, it is essential to prepare and present a case properly the first time around, because you won't get a second chance.