Invisible Killer

T1, E1: As the passengers and crew of Flight 191 to Dallas-Fort Worth Airport prepared for landing, a deadly force took shape in their path. In a matter of 47 seconds, the plane was sent rocketing toward a busy highway less than a mile from reaching its destination. Critical decisions and missed information conspire against the pilots, and in a fiery culmination, 136 lives are lost. Relive the harrowing events of August 2, 1985, and see how investigators from the National Transportation Safety Board identified the mysterious cause of the crash, a discovery that helped stop the invisible killer from ever striking again.