20 ILCS 2705/2705-225
The Department may provide air transportation for officers and employees of the offices, departments, and agencies of the State government and charge the office, department, or agency for that transportation. Charges for the transportation shall not exceed the expenses incurred and costs involved in providing air transportation and may include expenses for equipment, personnel, and operational expenses.
All requests for air transportation shall be made in writing and shall be signed by the executive officer or employee of the office, department, or agency.
Except as provided herein, all requests shall be filled in the following priority: (1) the Governor, (2) the Lieutenant Governor, (3) the legislative leaders of the General Assembly, specifically, the President and minority leader of the Senate and the Speaker and minority leader of the House of Representatives, (4) the Judges of the Supreme Court, (5) the Attorney General, (6) the Secretary of State, (7) the Comptroller, (8) the Treasurer, (9) other members of the General Assembly; and thereafter as provided by the Department.
20 ILCS 2705/2705-225