What happened
West Coast Airlines Flight 720 was operating a scheduled domestic route within the northwestern United States. The flight path connected Klamath Falls, Oregon, to Seattle, Washington, with planned intermediate stops at Medford, Eugene, and Portland. On March 10, 1967, the aircraft departed from Klamath Falls. Shortly after takeoff, the plane crashed. All individuals on board were killed in the incident.
Investigation
The source material does not provide specific details regarding the investigative process or the official conclusions drawn by aviation authorities concerning the cause of the crash.