When forecasting is done, we know something the number of passenger in year 2015and year2016 ,That increasing of number of passenger use airport more than 1,00,000.So the airport London Gatwick will develop airport suitable for increasing of passenger ,that becoming more the future. For accommodate in airport should have more than present in facility and safety. Because of the number of passenger are rising, it will supporting expenses. Forecasting can help in the preparation and prediction of demand also demand in the future.