A crowd watches as China’s heaviest cargo drone, the AT200, takes flight in Pucheng of Weinan, Shaanxi Province on October 30, 2017. The AT200 has a maximum take-off weight of 3.4 tons and a payload of 1.5 tons, making it one of the world’s most powerful drones for civilian use, according to Xinhua report. The demo flight lasted for 28 minutes. Photo: VCG/Wang Xiao/ Chengdu Commercial Daily