OAI
Airline On-Time Statistics and Delay Causes
Delay Cause Definition  Understand Delay Data   Database Tables  Flight Delays at a Glance
Show all reporting carriers Show all airports (by state)
Causes of National Aviation System Delays
National (June, 2016)
Most Recent Month      Year to DateView Individual Months  View Tabular Version  
More Topics:

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