a DC-6 flying over Longmont, Colorado, killing all 44 people on board. A passenger's son was later tried and convicted of placing the bomb on board. February 20, 1956 A TAI DC-6B (F-BGOD) crashed 18 mi NE of Cairo International Airport due to crew error and possible fatigue, killing 52 of 64 on board. August 29, 1956 Canadian Pacific Air Lines Flight 307 (a DC-6B, CF-CUP, Empress of Mexico City) crashed at Cold Bay, Alaska after the flaps were fully raised at low altitude while circling, killing 15 of 22 on board. October 10, 1956 US Navy R6D-1 Liftmaster 131588 disappeared over the Atlantic Ocean with 59 on board; small debris was found 370 mi WSW of Land's End, England. November 24, 1956 Linee Aeree Italiane Flight 451, a DC-6B (I-LEAD) flying from Rome to New York, crashed on climbout at midnight from Orly Airport, Paris due to an unexplained loss of altitude, killing 34 of 35 people on board. Captain Attilio Vazzoler, 41, was one of the more experienced pilot of the company with more than 10 thousand hours of flight, and the aircraft was new. The reasons of the disaster remain unknown. Conductor Guido Cantelli was one of the passengers that died in this crash. January 15, 1957 USAF C-118A 53-3263 was destroyed in a hangar fire at McChord AFB along with C-124C Globemaster II 52-1027; a Lockheed T-33 and de Havilland Canada L-20 Beaver were damaged. February 1, 1957 Northeast Airlines Flight 823, a DC-6A, crashed due to apparent pilot error onto Rikers Island shortly after taking off from LaGuardia Airport in conditions of poor visibility, killing 20 passengers and injuring many more. February 1, 1958 USAF C-118A 53-3277 collided in mid-air with US Navy Lockheed P2V Neptune 127723 over Norwalk, California, killing 47 of 49 on board both aircraft and one person on the ground. August 28, 1958 Northwest Orient Airlines Flight 537, a DC-6B, crashed due to apparent pilot error shortly after taking off from Minneapolis/St Paul Airport resulting in injuries but no deaths. December 26, 1958 Union Aéromaritime de Transport Flight 736, a DC-6B (F-BGTZ), crashed on takeoff from Salisbury Airport, Rhodesia (now Zimbabwe) after a loss of speed caused by a storm, killing three of 70 on board. June 22, 1959 A Pan Am DC-6A/B (N5026K, Clipper Panama) caught fire and burned out on takeoff from Shannon Airport after the number four engine