How do you calculate the delay index?

We begin with the airport's departure on-time performance and take into account the severity of delay and cancellations.  We measure delays and cancellations that have occurred at the airport over the last 2 hours and factor in schedule changes for flights departing within the upcoming hour to calculate delay index on a scale from 0 (very low or no delays) to 5 (severe disruptions to departing flights).

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