I too am one of those "Incheon, Korea, Republic of 09/23/2016 4:25 A.M. A mechanical failure has delayed delivery. We're adjusting plans to deliver your package as quickly as possible." people. Originally supposed to (per UPS) get my delivery yesterday, then today, now "Scheduled delivery information is not available at this time. Please check back later."
I called UPS yesterday and then again today but no help whatsoever from UPS besides "once it's in the USA, we'll know when you'll get it and you can make arrangements".
I spoke to Apple via Live Chat yesterday and was less than thrilled with their assistance, as they said that they couldn't do anything until it's past the original estimated ship date when I was due to receive it. Since I struck out completely with UPS again today, I decided to give Apple a call at 1-800-MY-APPLE to at least give them direct feedback about how poorly UPS is handling this situation for many of us, as well as tarnishing not only UPS's reputation, but Apple's also. The fellow that I spoke with was definitely understanding of my displeasure and even agreed that he'd likely be equally dissatisfied since Citizen has charged me for my first iPhone Upgrade payment and yet I don't have the phone and don't have a clue when I will receive it. He's opened a case number for it and will have someone look into it and get back to me to see if there's anything that they can do to expedite the process.
Even more importantly, I made sure that they were aware that Apple's decision to put all their eggs in UPS's basket was not a wise move, given the issues that UPS has been having and their blaming "weather", "mechanical breakdown", and even "Apple's special orders", depending on which shipment you're in or what the UPS representative decides they'd like to blame at a given moment, as has been discussed in previous posts in this thread. The Apple representative said, and I do believe this, that they do pay attention to feedback they receive, especially when it's something that one of their partners is doing that's impacting on Apple's reputation.
I do believe that if people who have been stuck in this limbo of UPS's contact Apple by the 1-800-MY-APPLE phone number and let them know what they've experienced, it's likely that at least the next time Apple does a major release, they'll have learned from this year's mistakes and will balance the load to limit the likelihood that Apple ends up with black eyes for their shipper's mistakes.
If I ever get an update from Apple, or UPS, I'll add it and we'll see how it goes.
My tracking information as of 08:55am 9/23/16 (EDT) is attached. It went from Yellow DELAYED to Green Clearance Completed between 08:52am and 08:55am today... looks pretty familiar, doesn't it?