Delta Air Lines Flight 191 (1985)

When this Lockheed L-1011 crashed, it led to major changes in weather-related flight procedures to prevent something as detrimental as this crash in 1985. A microburst in a thunderstorm caused the plane to come crashing down from the sky, while it attempted to land. After this crash, it forced the FAA to require all commercial flights to detect low-level wind shear (Fox Weather).