By David Shepardson WASHINGTON (Reuters) -Delta Air Lines and Aeromexico asked a U.S. appeals court on Friday to halt a Trump administration order forcing it to unwind a joint venture that lets the carriers coordinate scheduling, pricing and capacity for U.S.–Mexico flights. Aeromexico told the 11th Circuit Court of Appeals it would face substantial costs that it could not recover even if a court later upheld the arrangement. In September, the U.S. Department of Transportation ordered an end to the nearly nine-year-old joint venture by January 1, as part of several actions aimed at Mexican aviation, citing competition concerns. Delta said it would also face losses without a court order delaying the requirement pending a ruling. The airline said its flight operations "will face severe disru

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