Since AMZL deliveries are performed by independent logistics providers and independent contractors, delays beyond Amazon’s control are possible. This is why you may see a message such as “Carrier delay” when looking into a late package. Many things can cause a carrier delay, but the most common cause is that the delivery driver ran out of time to deliver the package to your residence. In this case, they’ll just attempt to make the delivery on their route the following day. The best thing for you to do in this case is to be patient.