"Airport charges" means charges for tie downs, landing fees, occupation of hangar by an aircraft, and all other charges owing or to become owing under a contract between an aircraft owner and Snohomish county or under an officially adopted regulation and/or tariff including but not limited to the cost of sale and related expenses. (Added by Ord. 88-006 § 4, Feb. 17, 1988; Amended by Ord. 92-132, Nov. 18, 1992).