Table 4 Original Models for Each Series,,,,,
Time series,Time period,Level,Slope,Seasonal,Outliers
Late arrivals,9/1987– 8/1/2001,Stochastic,None,Fixed,Outliers: 1/1996; 12/2000
Cancellations,9/1987–8/1/2001,Stochastic,Stochastic,Stochastic,Outliers: 3/1989; 3/1993; 1/1994; 2/1994; 1/1996; 9/1998; 1/1999; 12/2000
Enplanements,1/1991–8/1/2001,Stochastic,Stochastic,Stochastic,Outlier: 11/1996 Levels: 6/1992; 10/1992
Air revenue passenger-miles,1/1991–8/1/2001,Stochastic,Stochastic,Stochastic,Outlier: 11/1996 Levels: 6/1992; 10/1992
Rail revenue passenger-miles,1/1987–8/1/2001,Stochastic,None,Fixed,Outliers: 7/1989; 12/1997 Level: 11/2000


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