The white drone took off from a platform floating off Shanghai’s coast and zoomed out to sea, returning with a cargo hold full of fresh seafood. The flights to islands 130 kilometers away have cut what used to be an overnight ferry journey down to three hours, meaning fish that previously had to be frozen can now reach restaurants with more of their flavor intact. The service is popular among businesses with a “higher requirement for food quality,” said Sun Biao, a sales director of Phoenix Wings, whose drones have completed 800,000 flights across China.