Table 1-61:  FAA-Cited Causes of Departure and En route Delays (After pushing back from the gate),,,,,,,,,,,,,,,,,,,,
,1987,1988,1989,1990,1991,1992,1993,1994,1995,1996,1997,1998,1999, 2000, 2001,2002,2003,2004,2005,2006
Operations delayed (thousands),356,338,394,393,298,281,276,248,237,272,245,306,374,450,348,286,317,455,438,492
Cause (percent),,,,,,,,,,,,,,,,,,,,
Weather,67,70,57,56,65,65,72,75,72,74,68,74,69,69,72,72,72,70,69,66
Airport terminal volume,11,9,29,33,26,25,21,18,17,17,20,13,8,11,9,9,7,10,11,13
Air Route Traffic Control Center volume,13,12,8,2,1,2,1,1,1,2,2,2,4,3,3,5,4,5,4,3
Closed runways / taxiways,4,5,3,3,3,3,3,2,3,3,3,3,5,6,5,4,7,6,10,14
National Airspace System equipment,4,3,2,1,2,2,2,2,3,2,3,2,2,2,2,1,1,1,1,1
Other,1,1,1,4,3,3,2,2,4,2,4,6,13,9,10,9,9,8,5,3
KEY:  FAA = Federal Aviation Administration.,,,,,,,,,,,,,,,,,,,,
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NOTE,,,,,,,,,,,,,,,,,,,,
Numbers may not add to totals due to rounding.,,,,,,,,,,,,,,,,,,,,
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SOURCES,,,,,,,,,,,,,,,,,,,,
"1987-97: U.S. Department of Transportation, Federal Aviation Administration, Aviation Capacity Enhancement Plan (Washington, DC: Annual issues). ",,,,,,,,,,,,,
"1998-99: U.S. Department of Transportation, Federal Aviation Administration, Internet site http://www.faa.gov/apa/Delays/atDelays.htm as of Aug. 8, 2002. ",,,,,,,,,,,,,
"2000-06: Ibid., Operations Network (OPSNET) database query, Internet site http://www.apo.data.faa.gov/ as of Feb. 21, 2007.",,,,,,,,,,,,,