PMCO 777 - Which Fare Bucket to Watch for Miles + Copay Upgrade?
I'm flying IAH-NRT on a 2-cabin PMCO 777. Except for this flight, the whole itinerary (DEN-IAH, NRT-MNL (NH)-GUM-HNL-SFO) is showing in "K" while the IAH-NRT flight only is showing "S". Which of the following fare buckets should I be watching in terms of an upgrade using miles + cash?
Thanks.
The flight currently shows:
Available Cabins: J9, JN9, C9, D9, Z4, ZN4, Y9, YN9, B9, M9, E9, U9, H9, HN9, Q9, V9, W9, S9, T9, L9, K9