Since Minis are still available for Nov 13 delivery if ordered now, mine is scanned but probably still sitting somewhere. I also wonder that UPS is just waiting enough to fill up an airplane, and fly unscheduled flight when it’s full.
This is an old article and not Shanghai factory but my guess is the process is still similar. It says customs facility is a few yards away from the factory and one airplane can hold 150,000 iPhones.
https://www.nytimes.com/2016/12/29/...pple-stores.html?referringSource=articleShare