A utilizing previously unused space built during the 2010 rebuild of the Gate A4A/B connecting walkway. The program is the largest capital improvements project at the airport since the 2001 terminal redevelopment and is scheduled to be completed in the winter of 2019–2020. Facilities All terminals and hangars were on the square periphery. By the late 1970s, the shorter north–south and east–west runway pairs had been closed, though some were converted to taxiways. The other four runways remain in use, all strengthened and enhanced, but about the same lengths as always. A short runway (13R/31L) for light aircraft was added in 1989. Chicago Midway International Airport covers just over one square mile () and has five runways: 13C/31C: , air carrier runway, ILS-equipped 4R/22L: , air carrier runway, ILS-equipped 4L/22R: , general aviation and air taxi 13L/31R: , general aviation and air taxi. 13R/31L: , light aircraft only. Midway is surrounded by buildings and other development, so the landing thresholds of the runways are displaced to provide obstacle clearance. The FAA and the airlines ensure safety by adhering to calculated load limits and various weather minimums. Because of the displaced landing thresholds, the runways have shorter distances available for landings than for takeoffs. 13C/31C, the longest runway, only has an available landing distance of in the southeast direction, and to the northwest. The largest aircraft normally seen at Midway is the Boeing 757. Normally, commercial planes only take off from and land on runways 4R/22L and 13C/31C. The other runways are used by smaller aircraft and, per the US FAA Chart Supplement are restricted from use by large commercial aircraft except in emergency. Terminal Midway has 43 aircraft gates on three concourses. Concourse A has 17 gates. Concourse B has 23 gates. Concourse C has 3 gates. Airlines and destinations Passenger Statistics Top destinations Airline market share Airport traffic Accidents and incidents On December 8, 1972, United Airlines Flight 553, a Boeing 737-200, crashed into a residential area outside Midway during landing. The crash of the 737-200 killed 43 of the 61 on board, and two on the ground. One of the victims on the plane was Dorothy Hunt, the wife of Watergate conspirator E. Howard Hunt. She was carrying $10,000 in cash. James McCord alleged that she supplied the Watergate defendants with money for legal expenses. Exactly 33 years later, on December 8, 2005, Southwest Airlines Flight 1248, a