Air piracy refers to the hijacking of an aircraft in mid-air, which is a serious crime and a threat to aviation security. However, there are several synonyms for the term "air piracy" that are commonly used in different contexts. One of these synonyms is "airline hijacking," which is an act of seizing control of an aircraft by force. Another synonym for air piracy is "aerial piracy," which is the act of taking an aircraft by force or threat of force while it is in flight. Lastly, the term "skyjacking" is also used interchangeably with air piracy or airline hijacking and refers to the act of taking an airplane by force or threat while it is in the air.