[zyamada]

YMM but, in my area Amazon is only doing the last mile delivery. Theres a large parking lot in the industrial part of town where you can watch UPS, FedEx, and OnTrac branded trucks and van load packages into Amazon branded vans. The same type of van to van transfer seems to be happening pretty regularly at the local UPS store as well.

[Analemma_]

Amazon is doing their own last-mile delivery when that's profitable, doing long-haul delivery when that's profitable, and using UPS/USPS/FedEx for any other segment.