Members of the Hong Kong Air Cadet Corps (HKACC) accompanied with the International Air Cadet Exchange Association (IACE) members from Australia, Belgium, Canada, China, France, Netherlands, Republic of Korea, UK and USA visited the Hong Kong Observatory on 1 Aug 2017. The air cadets spent an educational and enjoyable morning in the Observatory. During the visit, the participants attended a lecture on aviation meteorology and aviation weather services in Hong Kong. They were also introduced of the Observatory's latest international collaboration on aviation meteorological services, research and development for the regional aviation community. The Observatory would continue to promote aeronautical meteorological knowledge through outreach and partnership with local and international aviation community.