Morse Code is used in ground control.
Lafayette Square Historic District is a historic district roughly bounded by Hickory and 18th Sts. , Jefferson and Lafayette Aves .. historic district. historic district ( United States ). in St. Louis , Missouri .. St. Louis. St. Louis. Missouri. Missouri. Buildings in the district include a department store , a single dwelling , a public park , and a specialty store .. department store. department store. public park. public park. The district was added to the National Register of Historic Places in 1972 .. National Register of Historic Places. National Register of Historic Places. A boundary increase in 1986 added an area roughly bounded by Chouteau Ave. , Dolman , Lafayette Ave. , and S. Eighteenth St. and Vail Pl .. and McKay Pl .. Buildings in the boundary increase include single and multiple dwellings , a manufacturing facility and a specialty store .