The word "劫机" (jiéjī), meaning "aircraft hijacking," is a modern Chinese compound formed by combining two characters: "劫" (jié), which means to rob, coerce, or seize by force, and "机" (jī), which is a shorthand for "飞机" (fēijī), meaning airplane. This structure follows the common Chinese grammatical pattern of a verb-object relationship, where the first character denotes the action ("to hijack") and the second character specifies the target of that action ("aircraft"). Thus, the term efficiently and logically conveys the concept of forcibly seizing control of an airplane.