Core Points - The 7th China Tianjin International Helicopter Expo has opened, featuring a public open day on October 18-19, with a focus on flight performances [1] - The event showcases both military and civilian aircraft, with notable performances and demonstrations [5][6] Group 1: Event Overview - The expo covers an area of 160,000 square meters, with nearly 400 exhibitors from over 30 countries and regions, including major global helicopter manufacturers [10] - The event has sold out 20,000 tickets daily, indicating high public interest and engagement [12] Group 2: Flight Performances - The flight performances are divided into military and civilian segments, featuring classic maneuvers and new choreography [6] - The "Kunlong," the world's largest amphibious aircraft, made a significant impression by accurately dropping 12 tons of water in a designated area [8]