Bankruptcy court approves AA's plan of reorganization and merger with US:
http://aviationblog.dallasnews.com/2...ion-plan.html/
If the antitrust suit is resolved in the airlines' favor, then the POR becomes effective and AA emerges from bankruptcy, merged with US.
If the airlines make material changes to the plan (like large concessions), then the plan has to go back for creditor and court approval.
If the merger is blocked, then obviously the POR is void and AA starts again by preparing an alternate POR.