In this chapter,
(1) “air carrier” means a person undertaking to engage in air commerce, whether directly or indirectly, or by lease, contract, or any other arrangement, and whether over regular or irregular routes;
(2) “air commerce” means carriage by aircraft of persons or freight for commercial purposes or hire in intrastate commerce, including the carriage by aircraft of persons or freight that move partly by aircraft and partly by other forms of transportation;
(3) “aircraft” means a propeller, rotor, or jet-powered device used or designed for flight in the air;
(4) “commercial purposes” means activities for which the person receives direct monetary compensation and does not include activities incidental to and done in furtherance of the person's primary business;
(5) “department” means the Department of Transportation and Public Facilities;
(6) “freight” means commodities, articles, and cargo, of whatever nature or value, excluding garbage and trash.