Actually, probably not. They may have phones bound for Canada or most probably apple watches on them or other apple products. Flightaware is just showing all UPS bound flights for Alaska. They have no way to know what actual flights have iPhones on them. My brother flies for UPS and will be doing the Apple run tomorrow...his second year of flying this route during launch week. UPS files flight plans but doesn't disclose what flights have iPhones or any other stuff in them, except internally. That is for security purposes...
You won't see movement on phones, bound for the US until tomorrow at the earliest...