A US federal judge has approved American Airlines' (AA) plan to emerge from Chapter 11 bankruptcy protection. As part of the plan AA's parent company, AMR, plans to merge AA with US Airways. However, the US Department of Justice (DoJ) has challenged the tie up on grounds of anti-competition. A trial is scheduled for November and if authorities reject the merger, AA would have to submit a new bankruptcy strategy. The federal bankruptcy judge, Sean Lane, said: "There can be no dispute that the plan is feasible if the merger succeeds."