I don't know if fixed-wings would help much with a box hanging beneath the drone. But i agree the final version will be a lot more aerodynamic and probably have

I don't know if fixed-wings would help much with a box hanging beneath the drone. But i agree the final version will be a lot more aerodynamic and probably have a horizontal and vertical flight mode. Amazon does stuff for long term profitability. They will do it if they know that it will eventually become cost effective with time and scale. Plus they will rationalize not having any margins (or even negative margins) by increased customer happiness and loyalty.