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Forecasting Passenger Case Problem 12.4 Arrivals at the Gotham International Airport Since the terrorist attacks of 9/11 and the ensuing measures by the federal Transportation Security Administration (TSA) to increase airline security, airports have faced the problem of long waiting lines and waiting times at security gates. One of the key components of any effort by the TSA to operationally improve airport security pro- cedures while reducing passenger waiting times and inconvenience is forecasting passenger arrivals at security checkpoints in order to de- termine how many security checkpoints and staff are needed. At the Gotham International Airport, TSA operations analystswould like to forecast passenger arrivals for next July, the airport's busiest travel month of the year, for the purpose of determining how many security checkpoints they should staff during the month in order that waiting lines and times will not be excessively long. Demand for airline travel has generally been increasing during the past three years. There