United Airlines Flight 629

United Airlines Flight 629, registration N37559, was a Douglas DC-6B aircraft, named "Mainliner Denver," which was blown up with a dynamite bomb placed in the checked luggage. The explosion occurred over Longmont, Colorado while the airplane was en route from Denver, Colorado to Portland, Oregon, and Seattle, Washington, on November 1, 1955. All 39 passengers and five crew members on board were killed in the explosion and crash.

• http://en.wikipedia.org/wiki/United Airlines Flight 629