Table 4: Original Models for Each Series

Table 4: Original Models for Each Series

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