User:RandomInfinity17/United Airlines accidents and incidents

Over the 93 years of United Airlines operations, the airline has been involved in 99 significant accidents and incidents and 40 fatal accidents and incidents resulting in 2,171 deaths. The deadliest incident was the hijacking of United Airlines Flight 175 during the September 11 attacks, in which all 65 aboard the aircraft were killed along with at least 1,000 other people on the ground. The deadliest accident was the mid-air collision of United Airlines Flight 826 and TWA Flight 266, in which all 128 aboard both planes were killed (84 of which on Flight 826) and six on the ground were killed as a result of Flight 826. The deadliest single aircraft accident was the crash of United Airlines Flight 232, in which 112 out of the 296 onboard the aircraft were killed.^[1]

1930s

• October 10, 1933 – United Air Lines Trip 23, a Boeing 247 (NC13304), exploded in-flight over Chesterton, Indiana, killing all seven occupants on board. The explosion was determined to be caused by a nitroglycerin bomb. While the perpetrator was never caught, it is the first proven case of a sabotage in commercial aviation.^[2][3]
• February 23, 1934 – A Boeing 247 (NC13357), crashed in Parley's Canyon 20 minutes after takeoff from Salt Lake City, killing all eight occupants on board. Pilot error in low visibility led to a controlled flight into terrain (CFIT).^[4]
• October 7, 1935 – United Air Lines Trip 4, a Boeing 247 (NC13317), crashed into the ground near Silver Crown, Wyoming, killing all twelve occupants on board. The probable cause was determined to be a CFIT due to the crew not keeping aware of their altitude.^[5]
• December 27, 1936 – United Air Lines Flight 34, a Boeing 247D (NC13355), crashed into the trees of Rice Canyon north of Los Angeles, killing all twelve on board. The cause was determined to be the pilot's intentional flight through Newhall Pass at a lower altitude than the surrounding mountains.^[6]
• February 9, 1937 – United Air Lines Trip 23, a
  San Francisco Municipal Airport, killing all eleven on board. The crash was caused by the first officer's microphone jamming the elevator controls, causing the decent to continue until the DC-3 impacted the bay.^[7]
• October 17, 1937 – United Air Lines Trip 1, Douglas DC-3A-197 (NC16074), crashed in the Uinta Mountains, 51 mi (82 km) east of Salt Lake City, killing all 19 on board. The cause was determined to be the continued decent into the mountains without a reliable altitude reference in low visibility.^[8]
• May 24, 1938 – United Air Lines Trip 9, a Douglas DST-A-207A (NC18108), made forced landing after an in-flight fire near Cuyahoga Heights, Ohio, killing all ten on board. The fire was caused by an engine oil leak inside of the right engine.^[9]
• November 29, 1938 – United Air Lines Trip 6, a Douglas DC-3A-191 (NC16066), ran out of fuel and ditched off the coast of Point Reyes, California, killing five out of the seven on board. The accident was caused by the pilot's failure to properly establish their position, which caused their deviation from the intended flight path.^[10]

1940s

• November 4, 1940 – United Air Lines Trip 16, a Douglas DC-3-197 (NC16086), crashed into Bountiful Peak near Centerville, Utah, killing all ten people on board. The crash was caused by the failure of Salt Lake City's navigational equipment in a snowstorm.^[11]
• December 4, 1940 – United Air Lines Trip 21, a Douglas DC-3A-197C (NC25678),
  Chicago Midway Airport, killing 10 of the 16 on board. The crash was caused by icing on the aircraft's wings while the aircraft was in a dangerous turn.^[12]
• January 21, 1941 – A Douglas DC-3A-197 (NC16072) was destroyed in a hanger fire while at Salt Lake City Municipal Airport.^[13]
• May 1, 1942 – United Air Lines Trip 4, a Douglas DC-3-A-207A (NC18146), crashed on approach to Salt Lake City Municipal Airport for unknown reasons.^[14]
• November 18, 1942 – A Douglas-3A-191 (NC16064) was written off after a crash landing at Wright-Patterson Air Force Base in Dayton, Ohio.^[15]
• January 11, 1943 – United Airlines Flight 14, a Douglas DC-3A-197 (NC16090) was written off after a crash landing at
  Oakland Municipal Airport.^[16]
• January 31, 1946 – A Douglas DC-3-194H (NC25675) suffered a CFIT and crashed into Elk Mountain, Wyoming, killing all 21 on board. The crash was caused by the flight crew's intentional deviation from the prescribed flight path at too low of an altitude.^[17]
• May 29, 1946 – A Douglas C-54A (NC30065) suffered a landing gear collapse on landing at Chicago Midway Airport. No-one was killed but the aircraft was determined to be a hull loss.^[18]
• October 8, 1946 – United Airlines Flight 28, a Douglas DC-4 (NC30051), crashed while landing at
  Cheyenne Airport, killing two out of the 41 on board. The cause was determined to be a loss of altitude while turning to land at the airport.^[19]
• November 11, 1946 – United Airlines Flight 404, a Douglas DC-3A (NC19947), crashed while on approach to Cleveland Municipal Airport, killing the two pilots out of the 20 occupants. The crash was a CFIT in low visibility conditions after the pilots mistaking which runway they were approaching.^[20]
• December 24, 1946 – A Douglas DC-4 (NC30050) suffered a
  Los Angeles Airport.^[21]