Indiana Code Title 8. Utilities and Transportation § 8-22-2-14

Sec. 14. Eligible entities may jointly acquire, construct, develop, improve, equip, or extend airports or property to be used for aviation purposes and maintain, operate, manage, and control it and levy and collect taxes for this purpose.  Two (2) or more entities may cooperate for this purpose by contributing to the total cost and sharing the benefits and bearing the obligations accruing from it on terms that they agree upon and evidence by contract.  The joint activity is subject to the same provisions and requirements provided for such activity if carried on by any one (1) of the entities individually, except that the joint board of aviation commissioners may be composed of more than four (4) but not more than seven (7) members and the maximum allowance may be increased correspondingly.  In case of failure of agreement between two (2) or more entities upon petition filed by one (1) or more of the entities involved, the aeronautics commission of Indiana, after investigation and hearing, shall determine and prescribe reasonable and equitable participation including representation on the joint governing board and shall prescribe other rules and regulations as necessary.