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, Operations delayed (thousands),356,338,394,393,298,281,276,248,237,272,245,306,374,450,348,286,317,455, Cause (percent),,,,,,,,,,,,,,,,,,, Weather,67,70,57,56,65,65,72,75,72,74,68,74,69,69,72,72,72,70, Airport terminal volume,11,9,29,33,26,25,21,18,17,17,20,13,8,11,9,9,7,10, Air Route Traffic Control Center volume,13,12,8,2,1,2,1,1,1,2,2,2,4,3,3,5,4,5, Closed runways / taxiways,4,5,3,3,3,3,3,2,3,3,3,3,5,6,5,4,7,6, National Airspace System equipment,4,3,2,1,2,2,2,2,3,2,3,2,2,2,2,1,1,1, Other,1,1,1,4,3,3,2,2,4,2,4,6,13,9,10,9,9,8, KEY: FAA = Federal Aviation Administration.,,,,,,,,,,,,,,,,,,, ,,,,,,,,,,,,,,,,,,, NOTE,,,,,,,,,,,,,,,,,,, Numbers may not add to totals due to rounding.,,,,,,,,,,,,,,,,,,, ,,,,,,,,,,,,,,,,,,, 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. ",,,,,,,,,,,,, "2000-04: Ibid., Operations Network (OPSNET) database query, Internet site http://www.apo.data.faa.gov/ as of Mar. 18, 2005.",,,,,,,,,,,,,