Absolutely, as well as various popular routes in season.

E.g. last fall, CLT-LAS and return had 100% seats held for revenue on the 8F 757 until the gate dance. I flew several times on that route, called the CP Desk to inquire too, and danced energetically enough at the gate to win the prize. They've gotten better for upgrade availability on that route in the winter. I haven't flown CLT-LAS since migration and can't say what the situation is now.

BTW, the nonstop RDU-LAS on the A319 is much better for upgrade success for Carolina folks going to Vegas.