FedEx and UPS could have made a killing on this, for whatever reasons they screwed up, probably asked for too much money. They've likely created a beast, I think Amazon is going to hurt them badly in the domestic markets, eventually. The aircraft will be good for moving stuff quickly across the continent but the end-delivery process is still the weakest link in the chain in the US and Canada. Rue the day when Amazon comes up with some kind of practical scheme to deliver packages to the end user (And I'm not talking about the drone junk)
FWIW Amazon has partnerships with local carriers for end-user delivery in Japan. It's a tenuous relationship but it has held up so far, with both companies seeing benefits.