Voucher seat assignment
I'm using a voucher to fly next month, and while I've gotten my itinerary, I don't have a seat assignment. I'm not all that experienced with flying US, so I was wondering if (a) there is a way to get a pre-assigned seat (it won't let me do so when I view my itinerary online), and (b) would it be worth it/possible to pay to upgrade my seat to F (WAS-CLT-PHX) using their "GoFirst" option.