They are so big and it seems like so much could go wrong yet they are statistically extremely successful.
In: Engineering
There’s lots of great answers in here, and I’ll just add a fun anecdote. I worked for one of the big companies that supply Wi Fi on planes. They were always trying to have 99.99% uptime or better. That wouldn’t have qualified to be a system used in standard aircraft operations because it wasn’t reliable enough.
Four nines is less than an hour of downtime over a whole year.
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