This is indeed UA p.s. metal. When booking on Orbitz, CO showed F and also allowed me to "request" a seat assignment in the F cabin (3 rows of 2x2, must be a p.s. 752). This was a $700 ticket, so I thought I'd hit the jackpot. However, on both the UA and CO websites it's showing "business" and "Z," with the UA site even allowing me to pick a seat in business.

I'm going to cancel (or if they refuse, issue a charge-back with Amex). Since I usually fly AA, and don't care about the miles, I'd rather try VX F since it's a bit cheaper. For some reason AA wants to charge twice as much as UA/DL/VX for this day/route...