The Ford Mustang was a car manufactured by Ford Motors.
Prior to Day 1, while undercover with Joseph Wald and Eddie Grant, Jack Bauer had a 1964-model Mustang. ("Day 2: 9:00am-10:00am")
After escaping from the prison in Downey during Day 3, Jack Bauer and Ramon Salazar stole a blue Mustang from a valet parking lot in Downtown Los Angeles. They drove the car to the Santa Margarita Airstrip, where one of Salazar's pilots was waiting to fly them to Las Nieves, Mexico. ("Day 3: 6:00pm-7:00pm")