70 ILCS 5/6
The Board of Commissioners of an Authority shall possess and exercise all of its legislative and executive powers. Within thirty days after the appointment of the initial commissioners, the board shall meet and elect a chairman. It shall then also select a secretary, treasurer and such officers or employees as it deems expedient or necessary for the accomplishment of its corporate objects, none of whom need be a member of the board. The board at said meeting by ordinance shall define the first and subsequent fiscal years of the Authority, and shall adopt a corporate seal and by-laws, which shall determine the times for the annual election of officers and of other regular and special meetings of the board, and shall contain the rules for the transaction of other business of the Authority and for amending such by-laws.
Each commissioner of any such Authority shall devote such time to the duties of such office as the faithful discharge thereof may require, and shall be compensated for such services upon such basis as the board of commissioners of such Authority shall provide by ordinance, and each commissioner shall also be reimbursed actual expenses incurred in the performance of such official duties, provided, however, in airport authorities having a population of not more than 500,000 the compensation for services of any commissioner shall not exceed $150.00 in any one month for services within the corporate limits of such Authority or within a distance of 50 miles from such corporate limits, and provided, further, that in airport authorities having a population of more than 500,000, the compensation for services of any commissioner shall not exceed the sum of $10,000.00 per annum.
70 ILCS 5/6