Figure 2: Monthly Seasonal Factors for U.S. Major Air Carriers On-Time Arrivals, (expressed as percentage point differences relative to the trend), based on data from January 2001 to December 2010

Figure 2: Monthly Seasonal Factors for U.S. Major Air Carriers On-Time Arrivals, (expressed as percentage point differences relative to the trend), based on data from January 2001 to December 2010

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Deviation from trend (percentage points)

  On Time Seasonal Factors
January -0.03
February -0.02
March -0.01
April 0.03
May 0.02
June -0.03
July -0.01
August 0.00
September 0.05
October 0.03
November 0.02
December -0.05

SOURCE: U.S. Department of Transportation, Research and Innovative Technology Administration, Bureau of Transportation Statistics, special tabulations, December 2010