ABSTRACT
Every day an extremely large number of trips are made and considerable amounts of merchandise are transported by air. The need for transportation arises from man's various activities. The input data for planning route networks, transportation facilities and for building new and reconstructing existing airports includes data that characterize the demand for air transportation services. This chapter discusses in detail the problem of transportation demand in air traffic. Multimode models are primarily used to estimate demand for air transportation on short-haul routes. Macroscopic models are used to estimate the development level of air transportation in a certain country or region. Microscopic models estimate air transportation demand between two cities, the passenger traffic at an airport, the number of passengers along a specific route when there are several different routes and the number of passengers in each class when there are different tariffs on a route.
