Adam Air Flight 574

Adam Air Flight 574 (KI574 or DHI574) was a scheduled domestic passenger flight operated by Adam Air between the Indonesian cities of Jakarta, Surabaya, and Manado that crashed into the Makassar Strait near Polewali in Sulawesi on 1 January 2007. All 102 people on board were killed, making it the deadliest aviation accident involving a Boeing 737-400. After this, Adam Air faced intense scrutiny by the Indonesian government, which launched a national investigation into the disaster. The government's final report, released on 25 March 2008, concluded that the pilots lost control of the aircraft after they became preoccupied with troubleshooting the inertial navigation system and inadvertently disconnected the autopilot. Despite a series of safety incidents, which contributed to the shut down of Adam Air in 2008, this was the only incident resulting in fatalities during the airline's 5-year existence.

Together with the subsequent crash of Adam Air Flight 172 and several other transportation accidents, the crash contributed to the United States' downgrading of its safety rating of Indonesian aviation. This eventually led to large-scale transportation safety reforms in Indonesia. All Indonesian airlines were banned from flying into the European Union for several years after the crash. After numerous warnings by the authorities for Adam Air to implement safety regulations, that went unheeded, the airline was banned from flying by the Indonesian government in March 2008, and declared bankruptcy in June of the same year.