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The Department of Justice, six state attorneys general and the District of Columbia filed a civil antitrust lawsuit today challenging the proposed $11 billion merger between US Airways Group Inc. and American Airlines’ parent corporation, AMR Corp. The department said that the merger, which would result in the creation of the world’s largest airline, would substantially lessen competition for commercial air travel in local markets throughout the United States and result in passengers paying higher airfares and receiving less service.

The Department of Justice’s Antitrust Division, along with the attorneys general, filed a lawsuit in the U.S. District Court for the District of Columbia, which seeks to prevent the companies from merging and to preserve the existing head-to-head competition between the firms that the transaction would eliminate. The participating attorneys general are: Texas, where American Airlines is headquartered; Arizona, where US Airways is headquartered; Florida; the District of Columbia; Pennsylvania; Tennessee; and Virginia.

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