On July 28, 1943, American Airlines Flight 63 was flown by a Douglas DC-3, named Flagship Ohio, routing Cleveland-Columbus-Dayton-Cincinnati-Louisville-Nashville-Memphis, that crashed on the Louisville-Nashville sector about 1.6 miles (2.6 km) west of Trammel, Kentucky.

[1] At the time of the crash, it serviced a domestic scheduled passenger route with several stops in Ohio, Kentucky, and Tennessee.

[1] During the Louisville-Nashville leg, the Flagship Ohio was crewed by four American Airlines personnel, and carried eighteen passengers.

Thunderstorms around Smiths Grove caused extreme turbulence and strong downdrafts which forced the plane to lose altitude.

Loss of control of the aircraft due to unusually severe turbulence and violent downdraft caused by a thunderstorm of unknown and unpredictable intensity.