Incoming college students receive their admission letters from Nanjing University of Aeronautics and Astronautics delivered by a drone in Nanjing, East China's Jiangsu Province, on July 23, 2024. The drone flew along low-altitude logistics routes for about 25 minutes, covering nearly 40 kilometers, to deliver the admission letters to the students, who are all majoring in aerospace-related fields. Photo: VCG