> but if you look at the location of most big warehouses (e.g. Amazon, Walmart) they're built outside of big cities for cost reasons, so now you have to fly twice as far to deliver packages onto the opposite side of the city.

90% of all Americans live within 15 miles of a Walmart. If they were able to launch drones from their store locations it might address this concern.

Wow, I assumed that was a guesstimate, but it's the actual stat! Crazy.

http://www.statisticbrain.com/wal-mart-company-statistics/