skyjacking       
noun [ C or U ] uk/ˈskaɪ.dʒæk.ɪŋ/ us/ˈskaɪ.dʒæk.ɪŋ/
 劫机
the activity of taking control of a flying aircraft by force, usually in order to make political demands, or an example of this
  The number of skyjackings has risen alarmingly this year. 今年劫机事件的数量上升得令人震惊。 
 Skyjacking has become a major problem for the airlines. 劫机已经成为航空公司的一个主要问题。 
 See: skyjack
 - More examples
 - The defendants were found not guilty of skyjacking in federal court.
 - The only unsolved skyjacking in the country's history continues to fascinate mystery lovers.
 - He introduced security measures at airports to prevent skyjacking.