#4 is less an issue since one truck can carry all the packages for people on its route. With Prime Air, it looks like it's one drone per package/person/destinat

#4 is less an issue since one truck can carry all the packages for people on its route. With Prime Air, it looks like it's one drone per package/person/destination. If the tradeoff is between vehicles per package (A) and average time to delivery (B), trucks choose A and drones choose B.