UPS Arrival Question? -

I ordered something from Logitech, and it is being tracked online. However they packages are both in Phoenix. (I m so close to Phoenix it s not even funny). The one pound box says it departed today at 1:21 AM. And it expected to be here Today (14th). However the 16 Pound box says it ll be here tomorrow. Why is this? Or will they both be coming today? Thanks, 10 points for clear answer.

Small boxes move through the system at a faster rate at UPS because their goal is to get the most deliveries done per day. Their system makes some guesses on the size of the box based on weight. and usually estimate larger boxes will take longer because they fill up the trucks faster. But humans do get involved and those humans realize that they can deliver more boxes per day if they stop one today at house A than once today and once tomorrow.If this wasn t the Christmas season I would say that there is about a 95% chance that both would show today. Because it is the Christmas season the chances are still pretty good but reduced because there are so many more packages to go through.