With the growing trend towards the electrification of transport, it is anticipated that internal combustion engines will continue to play an important role in the production of electricity for electricity systems or the direct propulsion of vehicles. However, these engines are under considerable pressure to achieve carbon neutrality, making zero-emission fuels a key solution. One solution is the use of hydrogen, which is an extremely clean and carbon-free fuel whose combustion product is only water. The paper also introduces the KEYOU concept, which involves switching from burning propellant oil to a supercharged, lean-burn, hydrogen-fueled ignition engine. The authors provide a study on the selected issues based on 113 reviewed literature sources and highlight the achievements and potential of hydrogen engines. Based on the achievements described, the paper provides a comprehensive overview of the impact of hydrogen engines in reducing emissions as well as supporting the sustainable development of transport systems. The literature research conducted highlights hydrogen as an important solution for decarbonizing internal combustion engines and moving towards an emission-free future.

Purpose: The main objective of the research is to identify and analyze areas of application of virtual reality in aviation. The specific objectives includes: (1) the assessment of the usefulness of virtual reality in pilot training, (2) conducting a SWOT analysis for pilot training, (3) the assessment of the potential of VR as a tool supporting the development of aviation personnel competencies and improving operational safety. Design/methodology/approach: The research uses the literature analysis method, the survey method and the SWOT analysis. To assess the perceived usefulness of virtual reality in pilot training, a survey was conducted among 30 individuals at various stages of their aviation careers (from ATPL(A) to First Officer) training. Authors used internet questionnaire survey. SWOT analysis was carried out also for pilot training area. Findings: Respondents closely related to pilot training (from ATPL(A) to First Officer) showed great interest in virtual reality. The study shows the potential of using virtual reality in supporting pilot training. Practical implications: The results presented in the article can be treated as an introduction to larger studies and a broader discussion on the potential of using virtual reality in pilot training. The survey results indicate a positive interest of respondents in the use of virtual reality in aviation. This topic should be researched more extensively and practical actions should be taken in this direction. Originality/value: As shown in the section on literature analysis, the topic of using virtual reality in aviation is not yet exploited. Hence the article shows an area that has great potential both in terms of research and application. Survey research were conducted on respondents closely related to pilot training (from ATPL(A) to First Officer). Based on the SWOT analysis, the article presents a view on the use of virtual reality in pilot training from various perspectives.