United Airlines Flight 629 bombing

United Airlines Flight 629, registration N37559, was a Douglas DC-6B aircraft also known as "Mainliner Denver", which was blown up with a dynamite bomb placed in the checked luggage on November 1, 1955. The explosion occurred over Longmont, Colorado at about 7:03 p.m. local time,[2] while the airplane was en route from Denver, Colorado, to Portland, Oregon, and Seattle, Washington. All 39 passengers and five crew members on board were killed in the explosion and crash.[2][3] Investigators determined that Jack Gilbert Graham was responsible for bombing the airplane to kill his mother as revenge for his childhood and to obtain a large life insurance payout.[3][4] Within 15 months of the explosion, Graham—who already had an extensive criminal record—was tried, convicted, and executed for the crime. wrote: