Tenn. Code Ann. § 42-3-205

For the purpose of providing the joint board with moneys for the necessary expenditures in carrying out this part, a joint fund shall be created and maintained, into which shall be deposited the share of each of the constituent public agencies as provided by the joint agreement. Any federal, state or other grants, contributions or loans, and the revenues obtained from the joint ownership, control and operation of any airport or air navigation facility under the jurisdiction of the joint board shall be paid into the joint fund. Disbursements from the fund shall be made by order of the board, subject to the limitations prescribed in § 42-3-204.