United Airlines Flight 409 was a scheduled flight departing from Denver, Colorado to Salt Lake City, Utah on October 6, 1955. The aircraft registration number was N30062, a Douglas DC-4 propliner. The aircraft crashed into Medicine Bow Peak, near Centennial, Wyoming, killing all 66 people on board (63 passengers, 3 crew members.) The victims included five female members of the Mormon Tabernacle Choir and military personnel. At the time, this was the deadliest airline crash in U.S. commercial aviation history,^[1][2] and it tied with the March 22 crash in Hawaii of a United States Navy Douglas R6D-1 Liftmaster military transport aircraft, which also took 66 lives,^[3] as the deadliest aviation accident of 1955.

• http://en.wikipedia.org/wiki/United Airlines Flight 409