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On-Time Performance - Flight Delays at a Glance
Year: 1999



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MonthOntime ArrivalsOntime (%)Arrival DelaysDelayed (%)Flights CancelledCancelled (%)DivertedFlight Operations
January307,07067.66%118,15326.04%26,5435.85%2,048453,814
February329,53178.91%72,79317.43%14,5233.48%780417,627
March364,10878.09%88,71519.03%12,4192.66%1,025466,267
April341,25275.73%99,35122.05%8,9231.98%1,094450,620
May352,01776.19%97,02221.00%11,8572.57%1,158462,054
June326,36370.88%119,81126.02%12,6762.75%1,617460,467
July336,89671.07%120,60325.44%14,8733.14%1,675474,047
August365,00176.11%101,73421.21%11,7112.44%1,103479,549
September365,19679.35%79,01417.17%15,2433.31%798460,251
October382,92180.06%85,01317.77%9,7512.04%609478,294
November370,39781.41%76,17516.74%7,6311.68%747454,950
December366,54178.00%94,34120.07%8,1611.74%901469,944
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1999 (Annual)4,207,29376.11%1,152,72520.85%154,3112.79%13,5555,527,884
* For purposes of this report, a flight is considered delayed if it arrived at (or departed) the gate 15 minutes or more after the scheduled arrival (departure) time as reflected in the Computerized Reservation System. ** The information is based on data submitted by reporting carriers. The number of reporting carriers varies as follows: 10 from 1997 to 1999, 11 in 2000, 12 in 2001, 10 in 2002, 18 in 2003, 19 in 2004, 20 in 2005, 21 in 2006 and 20 in 2007 (See Reporting Carriers by Year). Major Carriers 1997-Present refers to the 8 major carriers that reported for all those years. They are Alaska Airlines, American Airlines, Continental Airlines, Delta Air Lines, Northwest Airlines, Southwest Airlines, United Airlines, and US Airways. American Eagle Airlines and ATA Airlines are not included because they did not report for the full period. America West Airlines stopped reporting in 2006.
*** Effective January 2006, data of the merged operations of US Airways and America West Airlines are combined, and appear only as US or US Airways data in the flight delay tables.