Wing, the drone delivery company operated by Google-parent Alphabet, is about to rack up 100,000 deliveries. The company says it will pass the threshold in the next few days, a significant milestone for a technology that has nevertheless yet to prove its utility at scale.

Drone deliveries began to catch the public imagination in the early 2010s as consumer quadcopters fell in price and AI control systems became more reliable. Then, in 2013, Amazon made wild promises about making drones a standard part of its delivery empire. But so far the technology has mainly found success at a much smaller scale: delivering high-value but physically small items like vaccines and blood in remote locations.

Wing’s success, though, hints that one future…

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