Accuracy is an important factor in air traffic management which is why high requirements are necessary for each navigation system. The aim of this article is to describe the principles of the RelNav system and telemetry and their accuracy. We present the algorithms of the relative navigation system, which could be used for air traffic control in the case of the unavailability of satellite navigation system signals. This article sums up the different positioning methods, and deals with the accuracy of the relative navigation system (RelNav). Furthermore, the article considers the factors that influence the positioning accuracy. For this task, a computer simulation was created to evaluate the accuracy of the telemetric method. Next, we discuss the principles of telemetry and algorithms for calculating the position of the flying object (FO).

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The article aims to support the Safety Management System’s implementation in the Visegrad Four (V4) countries by introducing supporting documentation at the national level or national legislation. The research subjects are the V4 countries (Poland, Hungary, the Czech Republic, Slovakia), where 39 air carriers operate. Safety management in today’s world is already necessary, yet introducing a Safety Management System (SMS) is voluntary in many areas, including some transport modes. In air transport, it is mandatory, and the general principles and guidelines of this system are set out in the International Civil Aviation Organization (ICAO), which has issued several regulations and recommendations. The lists of ICAO standards and essential translations can be considered a minimum, which is also approached by different authorities. The article points out the primary differences in SMS in individual V4 countries and presents which country provides the strongest support in implementing this system.

An airline is an organization that provides air transport services for travelling passengers and cargo.There are over 5500 airlines in the world with ICAO codes. Not all airlines are formed and work equally. Airlines have a different market positions and operating methods. But from some point of view, we can see the same obstacles and difficulties which all must face. We may look at the economic challenges, demand and world crises as a great example. The principal purpose of the presented article is to discuss briefly the dilemmas of airlines, particularly recent coronavirus pandemic. In our analysis, we looked at some breaking points in the recent history of aviation. The current state was analyzed in the first phase. We performed an overall review, and the available data were summarized as forecasts before and after the health crisis. The main part of discussion was extended by displaying various changes in airlines' operation during the pandemic. Many airlines were forced to change their strategy, reduced their flight capacity, cut the frequency of flights and put their planes into hibernation mode. These differences have significant outcomes as bankruptcies, financial and employee losses etc. However, the coronavirus has started slowing the spread and most airlines are restarting their operations.

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