I'm really having trouble imagining how flying drones departing a central depot, delivering packages one at a time and then returning for the next one is more economical than a truck full of packages on a well-planned route.
Not to mention the fun the neighborhood kids will have shooting them down.
That's not the infrastructure they want to replace: it's the couriers who deliver the ultra-high priority packages.
So the ultimate goal of doing something like this would be to make same delivery normative? I wonder if there are patents filings that somehow try to protect this "intellectual property"?