USPS Priority mail is shipped via commercial airline flights. If you don't believe me watch all the packages go into the plain with Priority mail labels on them next time you fly. So they are actually shipped much faster than commercial companies that insist on sending everything through a hub. Also I think people are missing something the USPS does not offer tracking they offer Delivery Confirmation Nowhere do they state that the Delivery Confirmation numbers is tracking. The only time that number is updated is when it goes through a PO sort facility or gets delivered. Some people may live in areas where the packages never go through sort facilities they just get off the plane and go straight to your door.