Originally Posted by
mnredfox
Since I have 6 that I can't use internationally due to many reasons well known, maybe it is time I start burning these domestically.
I presume the upgrade fare class is easier domestically to snag than the non-existent Z class right?
I believe internationally, it is Y, B, M only.
I believe domestically (including Hawaii.... yes?), it is Y, B, M, Q, H, K.