The airport plays an important role in the development o fair transport and their ability to provide safe, fast, and efficient services for handling aircraft, passengers, cargo, goods, and mail in a time of increasing demand for air. Zagreb Airport is no exception, which has begun to record increasing traffic in recent years, and to meet market demands in 2017, a new passenger terminal was opened at Zagreb Airport to meet the increased demand for air transport. The thesis aims to analyze the infrastructural development of Zagreb International Airport during the duration of the concession from the traffic aspect defined by the concession agreement. The historical development of Zagreb Airport from the first Zagreb airport on Črnomerec to the development of Zagreb International Airport, which is used today, will be analyzed. The development of transport infrastructure through the theoretical and research analysis of the condition of Zagreb Airport before the concession period will be discussed in detail, as well as the development of transport infrastructure of Zagreb Airport after the takeover by the concessionaire in order to compare the condition of Zagreb Airport infrastructure before the concession period and through the concession period. Also, the analysis will answer the question of why the construction of a new passenger terminal at Zagreb Airport was necessary in order to meet the requirements of increased demand for air traffic. In conclusion, proposals, measures, programs, and solutions for the improvement of transport infrastructure on existing and future projects of Zagreb Airport will be offered.