In each case where an airport hazard area exists in connection with a publicly owned airport and suitable airport zoning regulations have not been adopted, administered and enforced for such airport hazard area in a form and manner deemed reasonably adequate by the commission for the purposes of this act, the commission on behalf of this state shall define and determine such airport hazard area and certify such determination to the board of supervisors of the county or counties within which such airport hazard area is located and to the political subdivision authorized by law to maintain, operate, improve and regulate such airport, hereinafter referred to in this section as the airport operating agency. Whereupon and within 90 days thereafter, the board of supervisors of each county involved shall appoint 3 members and the operating agency and the commission shall each appoint 1 member to a board which shall constitute a joint airport zoning board. Two of the members appointed by the board of supervisors of each county involved shall be from a township or townships within which the hazard area is located and 1 shall be from that part of the county outside the townships where the hazard area is located. Within 120 days after such certification such airport zoning board shall meet and organize and thereafter function in the same manner and with the same powers as joint airport zoning boards provided for under section 14 of this act. Members of joint zoning boards created pursuant to the provisions of this section shall be compensated for services actually rendered at a rate established by the airport operating agency and approved by the commission, and shall be reimbursed for any actual and necessary expenses incurred by them in the performance of their duties.

     Subject to the approval of the airport operating agency, each joint board created pursuant to the provisions of this section is hereby authorized to make such expenditures, to employ such servants and to engage such professional and consultant services as are necessary to carry out the provisions of this act. All expenses of such joint boards, including the compensation of its members, shall be paid by the airport operating agency. Provided, however, That the commission and the board of supervisors of any county involved, or any of them, are hereby authorized to participate in and contribute toward such compensation and expenses in such amounts and to such extent as may be fixed or provided by agreement.