Chicago O'Hare International Airport is a major United States commercial airport and global airline hub serving Chicago, with extensive passenger, cargo, runway, and intermodal infrastructure. The Chicago Department of Aviation lists eight active runways. The longest is 10L/28R at 13,000 ft, equivalent to 3,962.4 m using 0.3048 m per foot; this is the runway represented by the runway-length field. The active inventory includes 9C/27C, opened in 2020, and the 9R/27L extension completed in 2021. Source: CDA facility data, https://www.flychicago.com/business/CDA/factsfigures/Pages/facility.aspx (accessed 17 October 2026).