Originally Posted by boifromtroy
I imagine I will be in a middle seat somewhere in the back regardless, but any idea on how I can try to get a seat?
Have you tried calling BD directly? It doesn't matter that it's a UA codeshare, you are in their reservation system and they can assign you a seat if you call them directly.
Originally Posted by boifromtroy
does my one-way upgrade (15000 miles) also apply to all segments or just those on UA metal?
Only to UA segments... you cannot upgrade on non-UA metal on the same reward. Not that it matters... really no big difference between C & Y on these flights.