Certainly replacing helicopters with drones seems a pretty obvious step [0]. [0]: http://time.com/4171329/drone-helicopter-ehang-184-ces/ http://time.com/41713

Certainly replacing helicopters with drones seems a pretty obvious step [0]. [0]: http://time.com/4171329/drone-helicopter-ehang-184-ces/ http://time.com/4171329/drone-helicopter-ehang-184-ces/