Abstract
This paper examines aircraft engine histories to determine if deregulation affected the maintenance of aircraft engines. The examination shows that there was a significant increase in the number of engine hours between major overhauls in the period following deregulation. Parametric analysis of time between overhauls, which controls for other variables affecting the length of the shop visit cycle, suggest that deregulation is a significant factor in the change. Logit analysis shows that engine failures, as measure by in-flight shutdowns, have not increased following deregulation. These results indicate that airlines have optimized scheduled service times and possibly improved the quality of service while paying less attention to minor problems between scheduled service dates.
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