Platte County is a county located in the northwestern portion of the U.S. state of Missouri and is part of the Kansas City metropolitan area. As of the 2020 census, the population was 106,718. Its county seat is Platte City. The county was organized December 31, 1838, from the Platte Purchase, named for the Platte River. The Kansas City International Airport is located in the county, approximately one mile west of Interstate 29 between mile markers 12 and 15. The land for the airport was originally in an unincorporated portion of Platte County before being annexed by Platte City, and eventually Kansas City.

Kansas City International Airport is a public airport in Kansas City, Missouri, located 15 miles (24 km) northwest of Downtown Kansas City in Platte County, Missouri. The airport was opened in 1972 and a new complex in the airport was completed in 2023, replacing the old one. MCI replaced Kansas City Municipal Airport (MKC) in 1972, with all scheduled passenger airline flights moved from MKC to MCI. It serves the Kansas City Metropolitan Area and is the primary passenger airport for much of western Missouri and eastern Kansas.