This is my theory about the 7:10 hold up. That flight seems to have delivery dates from Monday all the way to Thursday on it. Peoples service levels are from savers to expedited. This makes complete sense what I'm about to explain. That plane has to land in Kentucky tonight or early in the A.M. in order to deliver the end of day express savers on Monday. Every single iPhone on that plane will be processed and then dispatched as it is considered an Air package. There is a chance that almost everyone has their delivery updated for tomorrow. If you were to order 2 T-shirts from China and you were to choose express saver and the other was expedited than your delivery dates would be different. This is a bulk shipment we are waiting for. Ups is treating all iPhones as a Next Day Air Savers when they hit the states. Yes I work for UPS.
Other UPSer here, I found an article online that states that UPS is operating flights out of ZhengZhou Monday-Friday and then I checked the thread from last year and peoples' tracking updated Monday morning at 4:45 AM EST (4:45 PM in China), and their phones hit Louisville late Monday night/Tuesday morning, some got their phones Tuesday morning (on time) while others got their phones Wednesday (on time). The only ones I can't explain are the Monday deliveries that are on the same container as ours.