Case 1. Forecasting Air Passenger Traffic (30 marks) The spreadsheeted contains data on international air passenger traffic for a major airport in the United States for two years prior to COVID-19 pandemic. The goal in this case is to forecast the volume of international passengers for year 3. Ignore the impact of the COVID-19 pandemic on air travels answer the following questions. Question: What other variables do you expect to influence the number of international travelers? Comment on at least three variables.