A US Airways plane, foreground, and an American Airlines plane …

Photo by Associated Press | published: August 14, 2013

A US Airways plane, foreground, and an American Airlines plane are seen parked at the terminal at Washington’s Ronald Reagan National Airport on Tuesday. The Justice Department and a number of U.S. state attorneys general Tuesday challenged a proposed $11 billion merger between US Airways Group Inc. and American Airlines’ parent company, AMR Corp.