On March 26, 1991, Singapore Airlines Flight 117 was hijacked in flight by four male passengers who claimed to be Pakistanis. The aircraft landed at Singapore. After their demands were not met, the hijackers threatened to begin killing hostages; before their deadline expired, commandos stormed the plane, killing the hijackers and freeing all hostages unhurt.

• http://en.wikipedia.org/wiki/Singapore Airlines Flight 117