In this file photo, a China's AG600 large amphibious aircraft conducts a flight test for firefighting in Xichang City of southwest China's Sichuan Province, June 23, 2023. China's AG600 large amphibious aircraft has entered the phase of certification flight tests, the Aviation Industry Corporation of China (AVIC) announced on Tuesday. On Tuesday, the Airworthiness Certification Center of the Aviation Administration of China issued the Type Inspection Authorization (TIA) to the first model of the AG600 large amphibious aircraft family, said the AVIC, China's leading aircraft manufacturer. (Xinhua)