ANWS participated in the 15th meeting of the East Asia Air Traffic Management Coordination Group (EATMCG 15) hosted online by Philippines through a webinar. All of attendants discussed information and working papers with regard to optimization of boundary separation, integration of regional air-traffic business, the development of Air Traffic Flow Management (ATFM) and establishment of mechanism for conducting Calculated Take-Off Time (CTOT) among members in East Asia on March 16th to 17th, 2023.