How do I map UA fare buckets to CO fare buckets - i.e., does E class on UA map to E class on CO? It's a good question because often fares are lower on ual.com for fare buckets that map to higher letters on the CO hierarchy and help with upgrades.

Here are two buckets. I eliminated C,D and Z from the CO bucket so they would line up, as UA doesn't publish discount F on this route.

UAL: F9 Y1 B0 M0 E0 U0 H0 Q0 V0 W0 S0 T0 L0 K0 G0 A9
CO: F9 Y0 B0 M0 H0 K0 Q0 U0 V0 G0 W0 E0 S0 T0 N0 L0

I am trying to figure out if I buy E class on ual.com for a CO codeshare, does that book me into H class on the CO system, or E class, which is much lower down the scale and would hurt my upgrade chances.