It appears there are some delays with production of Platinum models at Ford's Chicago assembly plant. I don't know why, but my scheduled build date just changed from August 24 to September 21 -- that's a delay of almost a month. You should check to see if your Platinum is being intentionally held in Chicago for some reason.
For the record, here's the sequence of events for my 2016 Explorer Platinum:
- Placed order with deposit: December 22, 2014
- Order confirmed by Ford: January 14, 2015
- Status updated to Unscheduled Clean: July 10, 2015
- VIN assigned: July 17, 2015
- Build date of 8/24 scheduled: July 24, 2015
- Build date of 9/21 scheduled: August 14, 2015
As you can see, things seemed to move right along from July 10 to July 24. Now, all of a sudden, there's a four-week delay. I suspect they discovered a "glitch" with the Platinum models and need time to resolve whatever it is.