This data flow is used within the Provide Driver and Traveller Services function. It contains details of an airline route that will suit a traveller's proposed trip and is associated with a cost and a schedule. The route may have intermediate points at which the services calls, and at which the traveller may have to change from one flight to another. There may be other intermediate points on the flight but these are of no concern to the traveller. The data flow consists of the following data items each of which is defined in its own DDE:
air_services_origin
+ air_services_intermediate_point
+ air_services_destination