One scenario I don't think many people, or any have mentioned. It seems that most of the phones shipped today were Silver 128GB, 16GB, 64 GB.
It seems to me that maybe these planes only have one type of phone on them. It would make sense that Apple's production schedule calls for them to make say 200k 128GB, 200k 64GB, and 100k, 16GB in a day. Then ship them off, in a recurring fashion. The next day they may produce SG in those sizes, the next Gold. I read that they're making 500k per day.
I fully expect that those people who aren't getting the 64GB SG is due to the fact that Apple hasn't produced them and got them on a plane yet. The way everything has been going down here over the last few days leads me to believe that the SG people are next, because Saturday saw a lot of Gold, Sunday saw a lot of Silver, so SG seems to be on deck!
Sure do hope all of you get them soon. As I posted way back mine shipped this morning at 10AM, got confirmation a few hours later. Silver 128GB 6+