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United States Department of Transportation

Airlines and Airports
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 (September, 2023)
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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