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Airline On-Time Statistics and Delay Causes
Delay Cause Definition  Understanding Delay Data   Database Tables  Flight Delays at a Glance
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Causes of National Aviation System Delays
National (July - December, 2017)
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A flight is considered delayed when it arrived 15 or more minutes than the schedule (see definitions in Frequently Asked Questions). Delayed minutes are calculated for delayed flights only.

SOURCE: Federal Aviation Administration OPSNET