The companies were close to completing a merger to create the world's biggest airline, but the Justice Department and six states sued this month to block the deal. They said it would reduce competition and lead to higher prices for travelers. They said that the combined American-US Airways would be too dominant at Reagan National Airport outside Washington and on many routes around the country.
Justice Department lawyers have also pointed to recent record profits at both airlines July's profit was a one-month high at American parent AMR Corp., which has been cutting costs under bankruptcy protection to argue that the companies don't need to merge to survive.
The airlines argue that their merger would increase competition by creating another big competitor to United Airlines and Delta Air Lines, which grew through recent mergers. They also point to the presence of other competitors including Southwest, which carries more passengers within the United States than any airline.
Both sides said in a court filing this week that they were open to a settlement that would avoid a trial, although each made comments suggesting that they were not close to agreement.
If the merger is blocked, AMR will have to rewrite its plan for emerging from bankruptcy protection. The merger is a key part of that plan.