Air New Zealand Flight 901 (1979)
DC-10 crash into Mount Erebus in Antarctica resulted in changes to flight navigation and training. This was the worst crash in aviation history. It crashed on the lower slopes of Mt. Erebus. All 237 passengers died, and not one survived. The plane originally departed on a sightseeing tour of Antarctica. Investigators assumed the main cause of the crash was due to changes in the flight plan, and the management computer which was not on properly (NZ History).