Ozark Air Lines was a local service carrier in the United States that operated from 1950 until 1986, when it was purchased by Trans World Airlines (TWA). In 2001, TWA was merged into American Airlines. A smaller regional airline that used the Ozark name operated in 2000–2001. From 1950 until 1986, Ozark's headquarters was located at St. Louis Lambert International Airport.

St. Louis Lambert International Airport is the primary commercial airport serving metropolitan St. Louis, Missouri, United States. Commonly referred to as Lambert Field or simply Lambert, it is the largest and busiest airport in the state of Missouri. The airport covers 3,793 acres (1,535 ha) of land. STL is located 14 miles (23 km) northwest of downtown St. Louis in unincorporated St. Louis County between Berkeley and Bridgeton. The airport provides nonstop service to airports throughout the United States and to the Caribbean, Mexico, Canada, and Europe. In 2019, it served nearly 16 million passengers. In 2023 there were more than 270 daily departures to 80 nonstop domestic and international locations.