620 ILCS 50/45
The county board shall consider for election to the Commission, only those persons whose names are presented by the county clerk. The county clerk shall present to the county board as candidates the names of all persons who have been nominated in the following manner: For whom a petition signed by 2% of the voters of such county or by 10% of the membership of the county board, or both, has been filed 48 hours prior to the convening of the county board meeting, provided such petition states that the person nominated is a candidate for election as a county board member, an Aviation member or a Non-Aviation member.
The county board shall proceed by roll call vote to elect the members of the Commission. Voting on county board members of the Commission shall not be joined with the voting for non-county board members of the Commission, nor Aviation with Non-Aviation members. No person shall be eligible to serve as a member of the Commission unless he has individually been elected by a majority of the members of the county board present at said meeting, whether voting or not voting.
620 ILCS 50/45