The UV-CAD (ultraviolet circulation air disinfection) is a cleaning system that sterilizes the air with the proven UVC cleaning method. This has been successfully used for many years in different areas like the medicine and the food industry. By using the UV-CAD, the room air is purified several times per hour destroying the viruses and bacteria i.e. SARS-CoV-2. The UV-CAD was developed especially for aircraft and has been tested according to aviation standards. The dangerous aerosols in the air are greatly reduced with the UVC technology, which significantly reduces the transmission of pathogens via the air in the aircraft.