As used in the Aircraft Registration Act:
A. "division" means the aviation division of the state highway and transportation department;
B. "director" means the executive head of the division;
C. "maximum gross weight" means the manufacturer's gross weight according to the operating limitations placard of the aircraft, furnished by the federal aviation administration; and
D. "specialized use" means use for commercial operations other than passenger carriage, including cargo hauling, crop dusting or spraying and forest fire-fighting use.