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Amazon’s Prime Air delivery drones can fly even farther after FAA approval
(www.theverge.com)
This is a most excellent place for technology news and articles.
The big issue with autonomous cars are the other cars that are driven by humans. As well as pedestrians and general rules of the road that need to be applied.
In theory drones have problems that are much easier to solve, because there's just less obstacles to deal with.
The big issues will likely be birds, wind, and rain.