Ind. Code § 8-22-5-4

Sec. 4. This chapter does not apply unless the statutes of the adjoining state permit political subdivisions of Indiana to acquire, establish, construct, own, control, lease, equip, improve, maintain, operate, and otherwise control airports, landing fields, or other air navigation facilities in that state, with all privileges, rights, and duties applicable to the political subdivisions of the adjoining state in aeronautical projects, including all tax privileges and immunities, the power of eminent domain as to property not devoted to public use, and the power jointly with political subdivisions of adjoining states to acquire, establish, construct, own, control, lease, equip, improve, maintain and operate airports, landing fields, or other air navigation facilities.