American School Bus Company is a subsidiary of Cook-Illinois Corporation. Operational for more than 40 years, Cook-Illinois Corporation is one of the largest, family-owned bus companies in Illinois. The parent company specializes in providing charter trips and daily bus and special needs transportation services. It maintains a fleet of more than 1500 regular and special education buses. Cook-Illinois Corporation serves over 200 school districts and employs nearly 1700 trained drivers. The parent company has several maintenance facilities and utilizes a computerized routing system. It operates various subsidiaries, including Alpha School Bus Company, Cook County School Bus and Kickert School Bus Line.