Amends the Use Tax Act, the Service Use Tax Act, the Service Occupation Tax Act, and the Retailers' Occupation Tax Act. In provisions concerning an exemption for materials, parts, equipment, components, and furnishings incorporated into or upon an aircraft, removes language excluding materials, parts, equipment, components, and consumable supplies used in the modification, replacement, repair, and maintenance of aircraft engines or power plants. Removes language providing that the exemption applies only to property used by persons who hold an Air Agency Certificate, have a Class IV Rating, and conduct operations in accordance with certain Federal Aviation Administration regulations. Effective immediately.