In this subtitle the following words have the meanings indicated. “Air school” means, except as provided in subsection (c) of this section, any person who, whether or not for compensation, gives or offers to give instruction in flying or in ground subjects relating to aeronautics. “Air school” does not include: Any public school or other noncollegiate educational institution approved by the State Board of Education; or Any college, university, or other institution of postsecondary education approved by the Maryland Higher Education Commission.