AutoAlliance International (AAI) is a joint venture automobile assembly firm co-owned by Ford Motor Company and Mazda Motor Corporation, in which Ford owns a (33.4%) controlling interest. The main AAI plant is located at 1 International Drive in Flat Rock, Michigan. Its approximately 2.7 million square feet and currently employs over 3,700 hourly and salaried workers.

In 1987, Mazda purchased Ford's unused former Michigan Casting Center, for North American production of the updated 1988 Mazda 626 sedans. The plant reopened in September 1987 as Mazda Motor Manufacturing (USA). Starting in 1987, AAI produced all Mazda MX-6 coupes and the similar Ford Probes sold in North America.

Ford repurchased a 50% share in the plant on April 15, 1992, and plant officially became a joint-venture and was renamed on July 1, 1992 as Ford took over operational management. The plant began production of all models of the Mazda 626 sold in America starting in 1993. The Ford Contour-derived Mercury Cougar was produced at the plant from 1999 to 2002. Production of North American Mazda6 models began in the 2002 model year, along with the current version of the Ford Mustang in 2005.

The factory is unionized with the United Auto Workers.