Next time you're taking off in a 737 would you rather be in a plane where the airline was proactive...........or reactive?

I work with industrial production lines that run 24/7. They're all maintained on a PM (Preventive Maintenance) schedule. If they just waited for things to fail and then reacted it would be a total disaster.

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'81 300CD - 180K, cannot be killed by any conventional means
'99 Ford Escort - good MPG