It's only natural for the accident rates to decline. Every time an accident occurs, it is thoroughly investigated and changes are implemented to reduce the changes of a similar accident occuring in the future. In other words, we learn from our previous mistakes (usually). Coupled with better CRM training and better equipment, it's no surprise that accident rates have declined over time. There's always more room for improvement. An aging aircraft fleet means we'll have to pay more attention to maintenance and oversight. As workers are replaced, training is an ongoing and never ending necessity.
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