American Airlines and US Airways want to know whom the government interviewed before it sued to block the airlines' merger, and what those people said.
The airlines say that the U.S. Department of Justice is refusing to turn over the names, claiming that doing so would reveal the thinking of antitrust lawyers who filed the lawsuit against the merger.
AMR Corp.'s American and the US Airways Group Inc. said in a filing Tuesday that they have asked a federal court in Washington to order the government to divulge the names and what they revealed.
The Justice Department declined to comment.
The companies were weeks away from closing their merger and forming the world's biggest airline when the Justice Department and several states filed a lawsuit in August to block the deal, claiming that it would hurt competition in the airline industry. The case is scheduled to go to trial Nov. 25.
The two sides are in pre-trial maneuvering. Last week, the airlines asked the court to force the government to say why it allowed four earlier airline mergers to go ahead but wants to block theirs.