Bingo. For example two years ago I drove for UPS during the Christmas rush. At the peak the Delivery center (one of three servicing the Salt Lake City Metro center) was pushing 80,000 packages a day. Two of those three centers were at the same location a third at another, that's about 240,000 a day at peak using roughly 300 package cars. A large volume of the volume was Amazon. Call it 100k, 300 trucks versus 100,000 drone flights a day leaving from the central sort and distro facility. And those package cars go out in all weather. What happens when a thundercell rolls through an area, will those perches hold a drone in place through 70 mph wind gusts, or how do they keep their delivery schedule going during a three day blizzard?