Because there’s an absurd amount of research and testing during all phases of the design, production, and use of a plane to make sure as few things can go wrong as possible, and that if something does go wrong, that the place can land safely anyway.
Planes undergo extensive periodic testing to make sure they’re still in good condition, and every accident is exhaustively researched by the NTSB (National Transportation Safety Board), with everything learned from each accident used to improve future plane designs to prevent it from occuring again.
[Safety Research (ntsb.gov)](https://www.ntsb.gov/safety/Pages/default.aspx)
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