Defined specific acts that constitute an act of terrorism:-
Convention on Offences on Board Tokyo Aircraft 1963 relates to hijacking.
Unlawful Seizure of Aircraft in Hague 1973 relates to different stages of hijacking and states certain crimes that have universal jurisdiction.
Unlawful Acts against the Safety of Civil Aviation 1971
Protocol for Acts of Violence against Airports 1988, e.g., where three planes were destroyed and in consequence civil aviation was also damaged. So, after this case separate rules on aviations were adopted.
Convention on Crimes against Internationally Protected Person 1973
Convention against physical Protection of Nuclear Material 1979
Protocol on Safety of Platform and Continental Shelf 1988