4-4 U.S. Airport Delays by Cause: 2012 (Table)

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percent of delayed time

Cause Delayed minutes Percent
Aircraft arriving late 23,569,552 41
Air carrier delay 18,165,456 32
NAS delay 12,828,822 23
Extreme weathera 2,279,810 4
Security delay 73,052 <0.5
Total 56,916,692  

aIncludes weather events that prevent flying. Other weather delays that slow operations are included under other categories.

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, Research and Innovative Technology Administration, Bureau of Transportation Statistics, Office of Airline Information, available at www.bts.gov as of October 2013.