Flight that exploded over Longmont Colorado in November 1955.
United Air Lines Flight 629
A United DC-6 at Stapleton Airport, similar to the aircraft involved
Bombing
Date
November 1, 1955
Summary
Bombing
Site
Longmont, Colorado, U.S. 40°12′0.51″N104°57′21.96″W / 40.2001417°N 104.9561000°W / 40.2001417; -104.9561000
Aircraft
Aircraft type
Douglas DC-6B
Aircraft name
Mainliner Denver
Operator
United Airlines
Registration
N37559
Flight origin
LaGuardia Airport, New York, New York
1st stopover
Chicago Midway International Airport, Chicago, Illinois
2nd stopover
Stapleton International Airport, Denver, Colorado
3rd stopover
Portland International Airport, Portland, Oregon
Destination
Seattle-Tacoma International Airport, Seattle, Washington
Occupants
44
Passengers
39
Crew
5
Fatalities
44[1][2]
Survivors
0
United Air Lines Flight 629, registration N37559 and dubbed Mainliner Denver, was a Douglas DC-6B aircraft that was blown up on November 1, 1955, by a dynamite bomb placed in the checked luggage. The explosion occurred over Longmont, Colorado, United States, at 7:03 p.m. local time,[1][3] while the airplane was en route from Denver to Portland, Oregon, and Seattle, Washington. All 39 passengers and 5 crew members on board were killed in the explosion and crash.[1][3]
Investigators determined that John Gilbert Graham was responsible for bombing the airplane in a bid to kill his mother as revenge for his childhood and to obtain a large life insurance payout.[4][5] Within fifteen months of the explosion, Graham—who already had an extensive criminal record—was tried, convicted, and executed for the crime.[4]
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^ ab"Jack Gilbert Graham". FBI. Archived from the original on May 13, 2022. Retrieved May 13, 2022.
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