ABSTRACT
Costs of air traffic partly depend on aircraft efficiency. A decrease in aircraft operation costs has an indirect effect on its efficiency improvement. This is possible by acquisition of new aircraft or by upgrading an existing one. In this paper, we introduce the technical possibilities of aircraft upgrade. The aim of this paper is to reveal reasonable upgrade in sense of aircraft attractiveness. There is an interconnection between partial design changes and their influence on direct operational costs. An emphasis is put on fuel efficiency. Some of changes are set great store by, and others are less interesting. We present information needed by students, economists, and manager to decide on the possible cost reduction by technical upgrade of airliner fleet.
