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Windows 3.1 saves the day during CrowdStrike outage — Southwest Airlines scrapes by with archaic OS
(www.tomshardware.com)
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So they spend more on maintenance, but the system is also dependable? That seems contradictory.
Not really. A machine that only breaks down every 10 years but is expensive to repair could be considered dependable and expensive to maintain. Similarly, a machine that has expensive parts which rarely fail within their expected lifespan could be considered dependable and expensive to maintain.
Edit: you're also ignoring the cost of finding and hiring people who know how to maintain the systems. The systems themselves could be dependable, but the skills required to maintain them are expensive.