ABM Industries Incorporated, through its subsidiaries, provides janitorial, parking, security, and engineering services for commercial, industrial, institutional, and retail facilities primarily in the United States. It operates in four segments: Janitorial, Parking, Security, and Engineering. The Janitorial segment provides floor cleaning and finishing, window washing, furniture polishing, and carpet cleaning and dusting, as well as other building cleaning services for customers in various facilities, including commercial office buildings, industrial facilities, financial institutions, retail stores, shopping centers, warehouses, airport terminals, health facilities and educational institutions, stadiums and arenas, and government buildings. The Parking segment operates approximately 1,633 parking lots and garages at various airports, including Austin, Texas; Dallas/Ft. Worth, Texas; Honolulu, Hawaii; Minneapolis/St. Paul, Minnesota; Omaha, Nebraska; Orlando, Florida; San Jose, California; Tampa, Florida; and Toronto, Canada. This segment also operates off-airport parking facilities in Houston, Texas and San Diego, California, as well as offers parking shuttle bus services at airports. The Security segment provides security officers, investigative services, and security consulting services, as well as involves in electronic monitoring of fire, life safety systems, and access control devices.