Most common Amazon delivery where I am is FedEx to the local post office, then USPS for last-mile.
I used to get around 25% of my Amazon packages from Fedex, now most come from Amazon's own delivery service, the rest either come from the USPS or UPS (or sometimes both - UPS delivers to the postoffice and the mailman delivers to my house)
I actually like Amazon deliveries. They leave the packages at the door (in this case I'm ok with) and send a picture of said delivery, verifying that they did indeed leave it at and not in the apartment main office (which is conveniently only open while I'm at work)
As a recipient, I like them - as a pedestrian and cyclist I don't, their drivers are horrible drivers, driving too close to cyclists, cutting off pedestrians on sidewalks, etc.I assume it's because they are under a lot of time pressure to make deliveries.
UPS drivers, despite the large trucks, seem to be much safer drivers.
It's a mix they use UPS, USPS, Fedex and now their own trucks/contractors vehicles all depending on which is cheapest at the moment. I do anecdotally get much more from all the others than from Fedex.
I agree. There has been the odd fedex package but extremely rare. It's usps, ups and most recently amazon delivery itself.
For me, it's a mix of UPS, USPS, and Amazon-branded "couriers" (in new Mercedes vans).