(70 ILCS 5/3.1) (from Ch. 15 1/2, par. 68.3a)
    Sec. 3.1. Boards of commissioners - Appointment. The Boards of Commissioners of Authorities shall be appointed as follows:
    (1) In case there are one or more municipalities having a population of 5,000 or more within the Authority, the commissioners shall be appointed as follows:
        (a) Where there is only one such municipality, 3 commissioners shall be appointed from
    
such municipality, and 2 commissioners shall be appointed at large.
        (a-5) Within 30 days after the effective date of this amendatory Act of the 95th General
    
Assembly, one additional commissioner shall be appointed to the board of the Springfield Airport Authority from each municipality having a population of 5,000 or more within the Authority, and one additional commissioner shall be appointed at large. The additional commissioners shall serve for a term of 4 or 5 years, as determined by lot. Their successors shall serve for terms of 5 years.
        (b) Where there are 2 or more such municipalities, one commissioner shall be appointed
    
from each municipality with a population between 5,000 and 45,000, 2 commissioners shall be appointed from each municipality with a population of more than 45,000, and 3 commissioners shall be appointed at large; except that when the physical facilities of the airport of the Authority are located wholly within a single county with a population between 600,000 and 3,000,000 there shall be one commissioner appointed from each municipality within the corporate limits of the Authority having 5,000 or more population and 5 commissioners appointed at large. If the Authority is located wholly within the corporate limits of such municipalities, 2 commissioners shall be appointed from the one of such municipalities having the largest population, and one commissioner shall be appointed from each of the other such municipalities, and 2 commissioners shall be appointed at large.
        (c) Commissioners representing the area within an Authority located outside of any
    
municipality having 5,000 or more population and commissioners appointed at large when the authority is wholly contained within a single county shall be appointed by the presiding officer of the county board with the advice and consent of the county board, and when the physical facilities of the airport of the Authority are located wholly within a single county with a population between 600,000 and 3,000,000 the commissioners appointed at large shall be appointed by the chairman of the county board of such county, and any commissioner representing the area within any such municipality shall be appointed by its mayor or the presiding officer of its governing body. If however the district is located in more than one county other than a county with a population between 600,000 and 3,000,000, the members of the General Assembly whose legislative districts encompass any portion of the Authority shall appoint the commissioners representing the area within an Authority located outside of any municipality having 5,000 or more population and commissioners at large but any commissioner representing the area within any such municipality shall be appointed by its mayor or the presiding officer of its governing body.
        (d) A commissioner representing the area within any such municipality shall reside
    
within its corporate limits. A commissioner appointed at large may reside either within or without any such municipality but must reside within the territory of the authority. Should any commissioner cease to reside within that part of the territory he represents, or should the territory in which he resides cease to be a part of the authority, then his office shall be deemed vacated, and shall be filled by appointment for the remainder of the term as hereinafter provided.
    (2) In case there are no municipalities having a population of 5,000 or more within such authority located wholly within a single county, such order shall so find, and in such case the Board shall consist of 5 commissioners who shall be appointed at large by the presiding officer of the county board with the advice and consent of the county board. If however the district is located in more than one county, the members of the General Assembly whose legislative districts encompass any portion of the Authority shall appoint the commissioners at large.
    (3) Should a municipality which is wholly within an authority attain, or should such a municipality be established, having a population of 5,000 or more after the entry of said order by the circuit court, the presiding officer of such municipality may petition the circuit court for an order finding and determining the population of such municipality and, if it is found and determined upon the hearing of said petition that the population of such municipality is 5,000 or more, the board of commissioners of such authority as previously established shall be increased by one commissioner who shall reside within the corporate limits of such municipality and shall be appointed by its presiding officer. The initial commissioner so appointed shall serve for a term of 1, 2, 3, 4 or 5 years, as may be determined by lot, and his successors shall be similarly appointed and shall serve for terms of 5 years. All provisions of this section applicable to commissioners representing municipal areas shall apply to any such commissioner. Each such commissioner shall reside within the authority and shall continue to reside therein.
    (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.
(Source: P.A. 94-466, eff. 1-1-06; 95-641, eff. 10-11-07.)