Dacca hijacking incident
Refers specifically to the 1977 hijacking of Japan Air Lines Flight 472 in Dhaka (then Dacca). Used as a proper noun for this historical event.
The Dacca incident was a hijacking of a Japan Air Lines flight that occurred in 1977.
Named after Dhaka (formerly Dacca), the capital of Bangladesh, where the hijacked plane was forced to land. 事件 means 'incident' or 'case'.