Originally Posted by
stvr
I do the $20 upgrades for first class all the time. Helps to fly at weird times. The question is, if I block myself into Premium Class and pay $19 for that, does that go toward the $20 for first class? Or does that money vaporize?
No and no. You have to contact Customer Care post-trip, and it's refunded. At least it was for me, but that was at least 5 or so years ago.