gates. Concourse E contains 28 gates. Concourse F contains 12 gates. Ground transportation The domestic terminal can be accessed directly from Interstate 85 at exit 72. The international terminal is accessed directly from Interstate 75 at exit 239. These freeways in turn connect with the following additional freeways within 10 miles: Interstate 285, Interstate 675, Georgia State Route 166, Interstate 20. Hartsfield–Jackson has its own train station on the city's rapid transit system, MARTA, served by the Red and Gold lines. The above-ground station is inside in the main building, between the north and south domestic terminals on the west end. The Airport station is currently the southernmost station in the MARTA system, though expansion via metro or commuter rail further south into Clayton County have been discussed. The Hartsfield–Jackson Rental Car Center, which opened December 8, 2009, houses all ten airport rental agencies with capacity for additional companies. The complex features 9,900 parking spaces split between two four-story parking decks that together cover , a customer service center, and a maintenance center featuring 140 gas pumps and 30 wash bays equipped with a water recovery system. An automated people mover, the ATL SkyTrain, runs between the rental car center, the Domestic Terminal, and the Gateway Center of the Georgia International Convention Center, while a four-lane roadway that spans Interstate 85 connects the rental car center with the existing airport road network. Other facilities The 990 Toffie Terrace hangar, a part of Hartsfield–Jackson Airport and located within the City of College Park corporate limits, is owned by the City of Atlanta. The building now houses the Atlanta Police Department Helicopter Unit. It once served as the headquarters of the regional airline ExpressJet. Before the merger, Atlantic Southeast Airlines was headquartered in the hangar, then named the A-Tech Center. In December 2007, the airline announced it was moving its headquarters into the facility, previously named the "North Hangar." The hangar includes of hangar bays for aircraft maintenance. It has of adjacent land and 1,400 parking spaces for employees. The airline planned to relocate 100 employees from Macon to the new headquarters. The Atlanta City Council and Mayor of Atlanta Shirley Franklin approved the new 25-year ASA lease, which also gave the airline new hangar space to work on 15 to 25 aircraft in overnight maintenance; previously, its aircraft were serviced at ConcourseC. The airport property division stated that the hangar was