Why Planes Crash (Season 2)_ Crisis In The Sky

United Airlines flight 173, A DC-8-63 crashes just short of Portland's Airport killing nine people. The truth about the crash would shock the United States!!! United Airlines flight 232, A DC-10-10 crashes in Sioux City killing 111 after a engines fails and could have UAL flight 173 have saved 185 lives and change how pilots work together??? Korean Airlines flight 801, A Boeing 747-300, Crashes short of Guam killing all but 27 people. Can the Investigators figure out what happen to all three flights???