Originally Posted by
cxfan1960
If OP does not ticket the underlying class, what ticket number can OP give MPC to confirm the upgrade?
ticket another ticket: like what OP said in his example, a to get a Y ticket after ticketing deadline.
Anyway, if my memory serves right, i think OP can ticket K class on CX125/126, and then pay for change fees and such (and subject to blackouts) for the U class upgrade on CX123/124