Ind. Code § 8-22-5-3

Sec. 3. The governing body of any political subdivision of Indiana may acquire, establish, construct, own, control, lease, equip, improve, maintain, and operate airports, landing fields, or other air navigation facilities in an adjoining state if the statutes of the adjoining state permit that action, subject to statutes, rules, and regulations of the adjoining state applicable to its own political subdivisions in aeronautical projects, but subject to Indiana law in matters relating to the financing of such projects. The aeronautics commission of Indiana must approve the acquisition and establishment of an airport or landing field in an adjoining state before the acquisition or establishment.