(4) Notwithstanding any other provision of this Section, the Board of Commissioners of a Metropolitan Airport Authority shall consist of 9 commissioners. Seven commissioners shall be residents of the county with a population between 600,000 and 3,000,000 within which the Metropolitan Airport Authority was established. These commissioners shall be appointed by the county board chairman of the county with a population between 600,000 and 3,000,000 within which the Metropolitan Airport Authority was established, with the advice and consent of the county board of that county.
Two commissioners shall be residents of the territory of the Authority located outside the county with a population between 600,000 and 3,000,000. These commissioners shall be appointed jointly by the mayors of the municipalities having a population over 5,000 that are located outside the county with a population between 600,000 and 3,000,000, with the advice and consent of the governing bodies of those municipalities.
The transition from the pre-existing composition of the Metropolitan Airport Authority Board of Commissioners to the composition specified in this amendatory Act of 1991 shall be accomplished as follows:
(A) The appointee who was required to be a resident of the area outside of the county with a population between 600,000 and 3,000,000 may serve until his or her term expires. The replacement shall be one of the 2 appointees who shall be residents of the territory of the Authority located outside the county with a population between 600,000 and 3,000,000. (B) The other 8 commissioners may serve until their terms expire. Upon the occurrence of the second vacancy among these 8 commissioners after the effective date of this amendatory Act of 1991, the replacement shall be the second of the 2 appointees who shall be residents of the territory of the Authority located outside of the county with a population between 600,000 and 3,000,000. Upon the expiration of the terms of the other 7 commissioners, the replacements shall be residents of the county with a population between 600,000 and 3,000,000. (C) All commissioners appointed after the effective date of this amendatory Act of 1991, and their successors, shall be appointed in the manner set forth in this amendatory Act of 1991.