Mich. Comp. Laws § 259.4

Sec. 4. As used in this act: (a) "Flight instructor" means any person who possesses a valid flight instructor certificate or other airman certificate issued by the federal aviation administration authorizing that individual to instruct in aircraft. (b) "Flight school" means any person providing or offering to provide flight training leading to pilot or flight instructor certification, for hire or compensation, and engaged in any of the following: (i) Advertising or calling oneself a flight school or anything equivalent to a flight school. (ii) Hiring, contracting, or otherwise using 1 or more flight instructors in an endeavor described in this section. (c) "Flying club" means any group of persons owning, leasing, or operating 1 or more aircraft, not for profit or reward, and using the aircraft for the purpose of providing its members with an aircraft for their personal use and enjoyment. (d) "Fuel" means any gasoline, distillate, benzine, naphtha, benzol, or other volatile and inflammable liquid produced, compounded, and used for propelling aircraft. (e) "Garage keeper" means any person who, for hire or reward, publicly offers to store, maintain, keep, or repair aircraft or any accessory used in the operation of aircraft and to furnish accessories and supplies for aircraft or any accessory used in the operation of aircraft.