Echoing mafro, this is a regional thing. Here in my corner of SW Missouri, Prime 2nd day delivery through the USPS is rock solid, and next day delivery, which I seldom use, is often through FedEx or UPS, who also don't screw up. From everything I've heard, you generally don't get good delivery service in big cities, although for Amazon I've heard they've been using some sketchy companies that only operate in such cities for that.
And I get the impression that bad Prime service through the USPS has more widespread problems. Amazon sure looks like it need to put more work on making this level of their logistics work much more uniformly, but I suspect they already are.
And I get the impression that bad Prime service through the USPS has more widespread problems. Amazon sure looks like it need to put more work on making this level of their logistics work much more uniformly, but I suspect they already are.