The county legislative body of a county that has an airport under the authority of T.C.A. § 42-5-101 et seq. may by resolution delegate its powers regarding the airport to a board whose number of members, terms, method of appointment, powers and duties are specified in the resolution. T.C.A. § 42-5-112. Joint airport boards, consisting of one or more counties and other public agencies, are also authorized for joint action regarding or joint operation of an airport. T.C.A. § 42-5-202. Joint airport boards consist of members appointed by the governing bodies of the public agencies participating. The number of members, the length of the term and compensation, if any, are determined by the joint agreement. T.C.A. § 42-5-203.