Here's my take on this: I called the Apple customer service number and spoke with a representative. He said that they put all of the preorders that have delivery scheduled for 9/21 under the category "holiday shipping" so that the carriers (i.e., UPS and FedEx) would note that those orders MUST be delivered that day. Basically, it is too insure that you will get your iPhone 5 order on the date specified on your order status.