Mayday

Invisible Killer (Delta Air Lines Flight 191)

Aired May 7, 2008 · 1:00 PM ET · 45 min

Alternative title: "Slammed to the Ground". In the summer of 1985, a Delta 191 aircraft was diverted away from a thunderstorm, only to be struck by powerful winds and plummet to the ground. Flames engulfed the front of the plane and more than 130 people died in a tragic accident that would eventually expose, and eliminate, an invisible killer.