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The captain on the flight on that day, Lee Hall, was a World War II veteran.
The aircraft used was N37559, a Douglas DC-6B. The flight took off at 6:29 p.m. Denver time. Several sticks of dynamite planted on the aircraft exploded nine minutes later, at 6:38 p.m., while the flight was over Longmont, Colorado.
A man named Jack Gilbert Graham had planted this bomb to collect his mother's insurance money. The death penalty was administered on him a year later.
This incident remains the only incident of an airliner being destroyed by a bomb over the mainland United States.