For the purposes of this Act, the term:
(a) "public airport" means any airport owned or operated by the State of Illinois, or by any municipal corporation or political subdivision of this state, which is used or intended for use by public, commercial and private aircraft and by persons owning, managing, operating or desiring to use, inspect or repair any such aircraft or to use any such airport for aeronautical purposes.(b) "individual charged with the responsibility of grounding aircraft" means a person who is regularly in the employ of a public airport in a managerial or operational position who has been specifically authorized by the governing body of the municipality which owns or operates the public airport to exercise the powers conferred by this Act.