7. Accidental shoot-down Civilian aircraft have been unintentionally shot down by a country's military.
In July 1988, the United States Navy missile cruiser USS Vincennes accidently shot down an Iran Air flight, killing all 290 passengers and crew.
In September 1983, a Korean Air Lines flight was shot down by a Russian fighter jet.
There is no evidence that Flight 370 was brought down by a government entity.