Wait listed for saver upgrade from T to I. Advantage not available.
Availability fluctuated between Z0 and Z3, S0.
At T-48, ability increased to Z4 C4, S0.
Outright redemption wait list possible for saver but not advantage.
at check in, Z4 C4, S0.
agent saw wait-list. Called supervisor. Was offered upgrade at advantage rate.
After upgrade processed, Z3 C3, S1