TABLE 3-1-3 - Airline Delays by Cause: 2003-2007

TABLE 3-1-3 - Airline Delays by Cause: 2003-2007

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Year Number of scheduled operations Number of delayed flights Average minutes of delay Percentage of delay minutes due to:
Carrier Extreme weather National Aviation System Security Late aircraft
2003 6,488,540 1,057,804 48.9 26.7 5.9 36.2 0.3 30.9
2004 7,129,270 1,421,393 51.4 25.8 6.9 33.5 0.3 33.6
2005 7,140,595 1,466,066 52.2 28.0 6.2 31.4 0.2 34.2
2006 7,141,922 1,615,538 54.0 27.8 5.6 29.4 0.3 37.0
2007 7,455,458 1,804,029 56.0 28.6 5.7 27.9 0.2 37.6

NOTES: On-time performance data is currently collected for 20 large carriers.

A flight is considered delayed when it arrived 15 or more minutes later than scheduled. Average minutes are calculated for delayed flights only. When multiple causes are assigned to one delayed flight, each cause is prorated based on delayed minutes for which it is responsible. The numbers above are rounded and may not add up to the total. Additional information is available at http://www.bts.gov/help/aviation/index.html.

SOURCE: U.S. Department of Transportation, Research and Innovative Technology Administration, Bureau of Transportation Statistics, Airline Service Quality Performance 234, available at http://www.transtats.bts.gov/OT_Delay/OT_DelayCause1.asp as of August 2008.