Just moments after takeoff, Japan Airlines Flight 123 experiences two explosions. The pilot is having trouble keeping the damaged Boeing 747 in the air. It plunges into the mountain. The accident becomes one of the deadliest accidents in aviation history. Investigators immediately suspect terrorism, but the remains tell a different story, threatening all 747 planes around the world.

A Kazakh crew manage to land an uncontrollable aircraft and investigators must determine how a freshly-serviced plane was released with a fatal flaw.