FORT WORTH (AP) American Airlines and US Airways want to know why the federal government allowed previous airline mergers, but wants to block theirs.

The airlines are asking a judge to order the U.S. Department of Justice to turn over documents about those previous mergers.

They made the request in a filing Friday with the U.S. district court in Washington, where a trial is scheduled to begin Nov. 25 on the government's lawsuit against the merger.

The Justice Department says the merger will limit competition and raise prices. The airlines say there will be plenty of competition.

The carriers want to know why regulators approved four deals Delta-Northwest, United-Continental, Southwest-AirTran and US Airways-America West but now argue that the American-US Airways merger would hurt consumers.

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