On January 7, 1953, a Curtiss C-46F Commando operating as Associated Air Transport Trip 1-6-6A crashed into terrain approximately 8 miles west of Fish Haven, Idaho, killing all on board.

The flight departed Boeing Field at 12:50 AM MST, and proceeded en route to Cheyenne Airport.

At 3:58 AM, the aircraft reported passing over Malad City, and estimated that it would reach Rock Springs at 4:45 AM.

[2] The investigation determined that, while flying near the mountains in between Malad City and Bear Lake, the aircraft involuntarily descended into an area of ice and turbulence, to avoid storm clouds.

However, the investigators were unable to determine the reason for the aircraft's descent into severe turbulence and icing conditions.