A Delta wide-body L1011 jet aircraft was one of several planes in the pattern to land at the Dallas/Ft Worth Airport in August 1985. As the jet made its final approach to the runway, a heavy rain, along with a strong downburst of air, called a micro-burst, developed suddenly ahead of it. The pilot was forced to put the aircraft nose down to gain airspeed and avoid a stall. Unfortunately, the plane did not have enough altitude for it to recover. The crash and ensuing fire killed 134 people. Exponent used data from the on-board digital flight data recorder ("black box") to describe the path and altitude of the aircraft during the event.

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