Moments from landing, United Airlines 585 starts spinning out of control and falls out of the sky at 450 kilometers per hour. Everyone on board is killed. In ten violent seconds, the crash site has become one of the most mysterious air disasters in aviation history.

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From Season 4 Episode 5 "Hidden Danger": Around the globe, more than six billion people have traveled on a Boeing 737. They’re the backbone of the aviation industry. But in 1991, something happened onboard a 737 that sent shudders through the world of aviation.

Almost two years after the crash, the NTSB had studied the crew, the weather, the rudder, and thousands of other pieces of evidence – but they can’t solve the mystery. For only the fourth time in its history, the NTSB release a report stating the cause of the crash of flight 585 was undetermined.

On September 7, 1994, a year after the report on Flight 585 is released, the killer strikes again. Another 737 – this time US Air 427 – crashes near Pittsburg. All 132 passengers and crew are killed. Investigators begin to quickly see some striking similarities between US Air 427 -- and the unsolved case of United 585.

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Mayday: Air Disaster is a dramatic non-fiction series that investigates high-profile air disasters to uncover how and why they happened. Mayday: Air Disaster follows survivors, family members of crash victims and transportation safety investigators as they piece together the evidence of the causes of major accidents. So climb into the cockpit for an experience you won’t soon forget.

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