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.