5-4 U.S. Airport Delays by Cause: 2015
Wednesday, January 4, 2017
percent of delayed time
| Cause | Delayed minutes | Percent |
|---|---|---|
| Security delay | 80,985 | <0.5 |
| Extreme weathera | 3,100,233 | 5 |
| NAS delay | 14,335,762 | 23 |
| Air carrier delay | 20,172,956 | 32 |
| Aircraft arriving lateb | 24,961,931 | 40 |
| Total | 62,651,867 |
aIncludes weather events that prevent flying. Other weather delays that slow operations are included under other categories. bDelay resulting from a previous flight with the same aircraft arriving late.
Key: NAS = Delays attributable to the national aviation system (NAS) that refer to a broad set of conditions, such as non-extreme weather, airport operations, heavy traffic volume, and air traffic control.
Note: Percents do not add to 100 due to rounding.
Source: U.S. Department of Transportation, Bureau of Transportation Statistics, Office of Airline Information, available at www.bts.gov as of October 2016.