The attorney general of Michigan joined the federal government's lawsuit on Thursday to stop the merger between American Airlines and US Airways.
Michigan is the seventh state to join the suit which says the merger is anti-competitive, would cut service at some airports and would hurt consumers with higher ticket prices and fees.
The Department of Justice filed an amended complaint in federal district court on Thursday that added Michigan to the list of plaintiffs. Texas, Arizona, Tennessee, Virginia, Florida, Pennsylvania and the District of Columbia were part of the original suit.
The carriers reiterated their readiness to present the benefits of the merger in court.
"The decision of the Attorney General of Michigan to join the Department of Justice does not diminish the strength of our case, nor our determination to complete this transaction and deliver the benefits of the combination to the customers and communities we serve," the carriers said in a joint statement. "Both American Airlines and US Airways want the opportunity to compete together to enhance competition with the largest airlines in the U.S. – United, Delta and Southwest – and a number of fast-growing low-cost carriers. We look forward to our day in court."
A trial has been set to begin on November 25 to hear the anti-trust suit.