In the era of globalization and permanent travel of people between far away regions of the world, air transport is one of the most important means of transport. Today it is also one of the most secure transport modes possibilities. Despite this, it is crucial to continuously improve the level of safety and reduce the absolute number of accidents and their victims. This idea stands at the beginning of the article subject creation and at the same time an attempt to further improve safety. The safety of the pilots and passengers plays a crucial role during air operations. One of the most important factors is the reliability of the aircraft. The main goal in the reliability work is to estimate the percentage of units of a product that will still be functioning after a particular period of time. In order to be able to make such a statement, it is necessary to select a probability distribution that will facilitate the construction of reasonably precise probability statements of the type that one wishes to make. In this analysis, the number of hours between failures has been used as the main variable for reaching the conclusion about the reliability of the aircraft at the selected examples.

The main goal in dependability work is to estimate the percentage of units of a product that will still be functioning after a particular period of time. In order to be able to make such a statement, it is necessary to select a probability distribution that will facilitate the construction of reasonably precise probability statements of the type that one wishes to make. In this analysis, the number of hours between failures has been used as the main variable for reaching the conclusion about the dependability of the aircraft. It was concluded that this distribution can be described as the log-normal distribution.

The aim of this paper is to analyse the situation of aviation and air traffic in European Union and to present the relation between the number of passengers of counties on the Old Continent, which will make it possible to observe the relationship and identify the causes of changes. The average growth rate is also presented in this contribution. Such an analysis may be helpful in preparing airports for increasing traffic in the future. A statistical analysis of selected aspects may enable to reveal the situation related to air transport in Europe and the predictions might visualise expectations in the following years. In this paper, the methods of statistical analysis and interpretations of studies presented in a graphical way, were used. The aim of the research was to understand the dependences between countries, trends of annual growth as well as relations between number of passengers with the gross domestic product. It was observed that the number of travelled people is growing as a function of time and it is dependent with the gross domestic product. The analyzed lands have been divided into five group according the average number of passengers. Similar tendencies have been observed in most of the cases.