WASHINGTON, Oct 24 (Reuters) - Aeromexico on Friday

asked the 11th Circuit Court of Appeals to halt a Trump

administration order forcing it to unwind a joint venture with

Delta Air Lines ( DAL ) by January 1 that lets the carriers

coordinate scheduling, pricing and capacity decisions for

U.S.-Mexico flights.

Aeromexico said it would face substantial costs to unwind

the joint venture that it could not recover even if a court

later upheld the arrangement. The U.S. Transportation Department

in September ordered an end to the nearly nine-year-old joint

venture as part of a number of actions aimed at Mexican

aviation, citing competition concerns.