In line with globalization and liberalization, the international air transport market is changing dramatically and increasing it role in society. Today's air traffic provides a growing network of flights. Route development has become a key activity in today's air traffic. In order for the route development to be successful, it is necessary to undertake a considerable amount of marketing research by the airport operator. Except the role of the airport operator, airlines are also included in the role of route development. This master thesis covers the theoretical part of the marketing service, the marketing mix, air traffic and its characteristics, airlines and their types and the development of routes and their importance and characteristics. The overview of Pula Airport operations, activities and services they provide are presented. Special attention and the most important part of the thesis is related to the analysis of the Pula Airport market and possible markets and routes.