Watertown Regional Airport (ATY/KATY) is a public-use airport located in Watertown, South Dakota, serving the northeastern region of the state. It is owned and operated by the City of Watertown and provides essential air service connectivity for the surrounding agricultural and commercial communities. The airport supports scheduled commercial passenger service, general aviation, charter flights, and cargo operations. It has benefited from the Essential Air Service (EAS) program, which subsidizes commercial air links to smaller U.S. communities that might otherwise lack scheduled service. The facility features a single runway and modest terminal infrastructure appropriate to its regional role. It serves as an important transportation node for residents of northeastern South Dakota who would otherwise face long drives to larger hubs such as Sioux Falls or Minneapolis.