S.D. Codified Laws § 50-6A-16
A regional airport authority may plan, establish, acquire, develop, construct, purchase, enlarge, improve, maintain, equip, operate, regulate, and protect airports and aviation facilities, within this state and within any adjoining state, including the acquisition, construction, installation, equipment, maintenance, and operation at such airports or buildings and other facilities for the servicing of aircraft or for comfort and accommodation of air travelers, and the purchase and sale of supplies, goods, and commodities as are incident to the operation of its airport properties. For such purposes an authority may by purchase, gift, devise, lease, eminent domain proceedings or otherwise, acquire property, real or personal, or any interest therein, including easements in airport hazards or land outside the boundaries of an airport or airport site, as are necessary to permit the removal, elimination, obstruction-marking, or obstruction-lighting of airport hazards or to prevent the establishment of airport hazards.
SDCL 50-6A-16