The Trump administration is defending an order by the Transportation Department that requires Delta Air Lines and Aeroméxico to dissolve their joint venture, saying the agreement gives them excessive control over U.S.-Mexico flights.In a court filing Monday, the government said the Transportation Department "validly decided to no longer authorize legalized collusion" between two airlines that together control nearly 60% of operations at Mexico City International Airport, one of the largest international gateways to and from the United States.The joint venture, first approved in 2016 under anti...

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