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OAI
Airline On-Time Statistics and Delay Causes
Delay Cause Definition Understand Delay Data Database Tables Flight Delays at a Glance

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	Show all reporting carriers	Show all airports (by state)
Flight Delays by Cause National (December, 2012)
	Most Recent Month Year to Date	View Individual Months View Tabular Version Download Raw Data

More Topics:

On-Time Arrival Performance
Weather's Share of Delayed Flights
Weather's Share of National Aviation System (NAS) Delays
National Aviation System (NAS) Delay by Cause

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.
When multiple causes are assigned to one delayed flight, each cause is prorated based on delayed minutes it is responsible for. The displayed numbers are rounded and may not add up to the total.

SOURCE: Bureau of Transportation Statistics, Airline Service Quality Performance 234